Claude Code transcript - page 1/1

[
  {
    "type": "text",
    "text": "Excellent! Now let me write up my findings in a comprehensive report.\n\n## Summary\n\nI've explored the current state of the occam2go transpiler's ability to process the course module. Here's what I found:\n\n### Current Status\n\n**course_nofloat.module** - **WORKS PERFECTLY**\n- Transpiles without any errors\n- Successfully includes: consts.inc, utils.occ, string.occ, demo_cycles.occ, demo_nets.occ, file_in.occ, random.occ\n\n**Full course.module** - **FAILS** due to float_io.occ\n- Contains references to /home/david/projects/code-associates/occam2go/kroc/modules/course/libsrc/float_io.occ\n\n### Specific Errors and Missing Language Features\n\nThe float_io.occ file contains **88 total references** to unimplemented language features. Here's the breakdown:\n\n#### **1. RETYPES (2 occurrences)**\n- **What it is**: Type punning / bit-level type reinterpretation\n- **Example** (line 139): `VAL INT X RETYPES X :`\n- **What it does**: Reinterprets the bit pattern of one type as another type\n- **Go equivalent**: Would need `math.Float32frombits()`, `Float64bits()`, or unsafe pointer casts\n\n#### **2. Transputer Intrinsic Functions (88 - 2 = 86 occurrences total)**\n\nThese are extended-precision arithmetic functions needed for float-to-string conversion:\n\n- **LONGPROD (12 occurrences)** - Extended-precision multiplication returning (high, low)\n  - Example: `Zfrac, Carry := LONGPROD (PowerTenFrac[St], Xfrac, Carry)`\n  \n- **LONGDIV (7 occurrences)** - Extended-precision division\n  - Example: `Xfrac, Carry := LONGDIV (Xfrac >> 1, 0, Zfrac)`\n  \n- **LONGSUM (23 occurrences)** - Extended-precision addition\n  - Example: `Carry, Xfrac := LONGSUM (Xfrac, 1, 0)`\n  \n- **LONGDIFF (15 occurrences)** - Extended-precision subtraction\n  - Example: `Borrow, dummy := LONGDIFF (Carry, Zfrac >> 1, 0)`\n  \n- **NORMALISE (6 occurrences)** - Normalize extended-precision numbers\n  - Example: `Places, Xfrac, Carry := NORMALISE (Xfrac, Carry)`\n  \n- **SHIFTRIGHT (10 occurrences)** & **SHIFTLEFT (11 occurrences)** - Bit shifting operations\n  - These work on extended-precision values\n  \n- **CAUSEERROR() (2 occurrences)** - Error-raising primitive\n  - Would map to `panic(\"CAUSEERROR\")`\n\n### Other Observations\n\n1. **Identifiers with dots** - The lexer ALREADY supports dots in identifiers (e.g., `round.direction`, `decimal.point`, `max.no.of.zeroes.before.first.significant.digit`), so these work fine\n\n2. **Variable names with dots and numbers** - The transpiler handles identifiers like `Buf.1`, `Places.1`, `LogX.1` correctly via the lexer's readIdentifier function\n\n3. **#PRAGMA DEFINED** - The preprocessor correctly ignores these directives by converting them to blank lines\n\n### Files Involved\n\n- **Full course module**: `/home/david/projects/code-associates/occam2go/kroc/modules/course/libsrc/course.module`\n- **Working version**: `/home/david/projects/code-associates/occam2go/course_nofloat.module`\n- **Problematic file**: `/home/david/projects/code-associates/occam2go/kroc/modules/course/libsrc/float_io.occ` (2261 lines)\n\n### What Needs to Be Implemented\n\nTo fully support the course module, the following features must be added (in order of occurrences/priority):\n\n1. **LONGSUM** - 23 occurrences (Highest priority - most used)\n2. **LONGDIFF** - 15 occurrences\n3. **LONGPROD** - 12 occurrences\n4. **SHIFTLEFT** - 11 occurrences\n5. **SHIFTRIGHT** - 10 occurrences\n6. **LONGDIV** - 7 occurrences\n7. **NORMALISE** - 6 occurrences\n8. **RETYPES** - 2 occurrences\n9. **CAUSEERROR()** - 2 occurrences\n\nThese are all pre-existing items in the TODO.md file and marked as Phase 2 work."
  },
  {
    "type": "text",
    "text": "agentId: ab726b9 (for resuming to continue this agent's work if needed)\n<usage>total_tokens: 46774\ntool_uses: 55\nduration_ms: 223647</usage>"
  }
]

Parse errors:
  line 2097: expected IS, got IDENT
  line 2097: unexpected token: :
  line 2101: expected type after VAL, got IDENT
  line 2101: unexpected token: IS
  line 2101: unexpected token: INT
  line 2101: unexpected token: :
  line 2102: expected type after VAL, got IDENT
  line 2102: unexpected token: IS
  line 2102: unexpected token: INT
  line 2102: unexpected token: :
  line 2103: expected type after VAL, got IDENT
  line 2103: unexpected token: IS
  line 2103: unexpected token: INT
  line 2103: unexpected token: :
  line 2104: expected type after VAL, got IDENT
  line 2104: unexpected token: IS
  line 2104: unexpected token: INT
  line 2104: unexpected token: :
  line 2107: expected type after VAL, got IDENT
  line 2107: unexpected token: IS
  line 2107: unexpected token: INT
  line 2107: unexpected token: :
  line 2108: expected type after VAL, got IDENT
  line 2108: unexpected token: IS
  line 2108: unexpected token: INT
  line 2108: unexpected token: :
  line 2109: expected type after VAL, got IDENT
  line 2109: unexpected token: IS
  line 2109: unexpected token: INT
  line 2109: unexpected token: :
  line 2110: expected type after VAL, got IDENT
  line 2110: unexpected token: IS
  line 2110: unexpected token: INT
  line 2110: unexpected token: :
  line 2111: expected type after VAL, got IDENT
  line 2111: unexpected token: IS
  line 2111: unexpected token: INT
  line 2111: unexpected token: :
  line 2112: expected type after VAL, got IDENT
  line 2112: unexpected token: IS
  line 2112: unexpected token: INT
  line 2112: unexpected token: :
  line 2113: expected type after VAL, got IDENT
  line 2113: unexpected token: IS
  line 2113: unexpected token: INT
  line 2113: unexpected token: :
  line 2117: expected type after VAL, got IDENT
  line 2117: unexpected token: IS
  line 2117: unexpected token: INT

     1→--
     2→--	Type conversion library
     3→--	Copyright (C) 1988, 1990  Inmos Limited
     4→--
     5→--	This library is free software; you can redistribute it and/or
     6→--	modify it under the terms of the GNU Lesser General Public
     7→--	License as published by the Free Software Foundation; either
     8→--	version 2 of the License, or (at your option) any later version.
     9→--
    10→--	This library is distributed in the hope that it will be useful,
    11→--	but WITHOUT ANY WARRANTY; without even the implied warranty of
    12→--	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13→--	Lesser General Public License for more details.
    14→--
    15→--	You should have received a copy of the GNU Lesser General Public
    16→--	License along with this library; if not, write to the Free Software
    17→--	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
    18→--
    19→
    20→--** @module course
    21→
    22→--{{{  #'s
    23→-- #OPTION "E V" -- no compiler libraries, no vector space
    24→#COMMENT "Type conversion library V1.6 4/12/90"
    25→#COMMENT "(C) Copyright INMOS limited 1988, 1990"
    26→--}}}
    27→
    28→--{{{  REAL32TOSTRING
    29→--* Format a [@code REAL32] number as a decimal string.
    30→--
    31→-- [@code Ip] and [@code Dp] control how the number is formatted.
    32→-- If [@code Ip > 0] and [@code Dp > 0], fixed-point format will be used with
    33→-- [@code Ip] digits before the point and [@code Dp] digits after the point.
    34→-- If [@code Ip = 0] and [@code Dp > 0], exponential format will be used with
    35→-- [@code Dp] digits in the fraction.
    36→-- If [@code Ip = 0] and [@code Dp = 0], a "reasonable" format will be chosen
    37→-- automatically.
    38→--
    39→-- @param len The number of characters ([@code BYTE]s) of string occupied by
    40→--   the formatted decimal representation of the real number
    41→-- @param string An array containing the formatted decimal representation of
    42→--   the real number in the first [@code len] bytes, the remaining bytes being
    43→--   undefined
    44→-- @param X The real number, in IEEE format, to be converted
    45→-- @param Ip The first of two formatting values
    46→-- @param Dp The second of two formatting values
    47→PROC course.REAL32TOSTRING (RESULT INT len, RESULT []BYTE string, VAL REAL32 X, VAL INT Ip, Dp)
    48→
    49→  --{{{  specification
    50→  --{{{  Notes
    51→  -- Notes:    Rounding mode is round to nearest.
    52→  --           Which format is used depends on the combination of values
    53→  --           of Ip, Dp and X.  In all cases, any digits beyond the 9th
    54→  --           significant digit for single precision or 17th significant
    55→  --           digit for double precision will be given as 0 and cannot
    56→  --           be considered accurate.
    57→  --           If string overflows this routine acts as an invalid process.
    58→  --{{{  Case i
    59→  -- Case (i):    Ip = 0, Dp = 0  => free format
    60→  --           Where possible a fixed point representation is used.  If
    61→  --           it is not used then exponential form is used.  It is not
    62→  --           used if more than 9 | 17 significant digits of accuracy
    63→  --           ( single | double ) would be required before the decimal
    64→  --           point, or if there are more than 3 zeroes after the decimal
    65→  --           point before the first significant digit.  In any case, the
    66→  --           maximum number of characters returned in string is 15 for a
    67→  --           single precision X, and 24 for a double precision X.
    68→  --           string is left justified.
    69→  --           If X is infinity or a NaN, then the string will contain one
    70→  --           of "Inf", "-Inf" or "NaN", but not the quotes.
    71→  --}}}
    72→  --{{{  Case ii
    73→  -- Case (ii):   Ip = 0, Dp > 0  => exponential format
    74→  --           The form of exponential format is, firstly either a minus
    75→  --           sign or a space ( this latter instead of an explicit plus
    76→  --           sign ), a fraction in the form <digit>.<digits>, the
    77→  --           exponential symbol ( E ), the sign of the exponent ( + or
    78→  --           - ), then the exponent, which is two digits for a single
    79→  --           precision X, three digits for a double precision X.  Dp
    80→  --           gives the number of digits in the fraction ( 1 before the
    81→  --           point, and the others after, but not counting the point ).
    82→  --           The total number of characters in string is ( Dp + 6 )
    83→  --           for a single precision X, and ( Dp + 7 ) for a double
    84→  --           precision X.
    85→  --           If Dp = 1 then the fraction is of the form <space>digit
    86→  --           ( which, note, will not result in occam syntax for the
    87→  --           real ).
    88→  --           If X is infinity or a NaN, then the string will contain one
    89→  --           of " Inf", "-Inf" or " NaN", but not the quotes, padded on
    90→  --           the right to fill the field width.
    91→  --}}}
    92→  --{{{  Case iii
    93→  -- Case (iii):  Ip > 0, Dp > 0  => fixed point if possible
    94→  --           Ip gives the number of places before the point, not
    95→  --           counting the sign place; Dp the number of places after
    96→  --           the point.  Padding spaces are added on the left as
    97→  --           necessary.  If the number will not fit the format,
    98→  --           then an exponential format is used with the same field
    99→  --           width as the fixed point representation would have had.
   100→  --           If Ip and Dp are very small then an exponential

     1→# occam2go — Implementation Status
     2→
     3→## Fully Implemented
     4→
     5→### Core Constructs
     6→- **SEQ** — Sequential execution, with replicators (`SEQ i = 0 FOR n`) and optional STEP
     7→- **PAR** — Parallel execution via goroutines + sync.WaitGroup, with replicators
     8→- **IF** — Multi-branch conditionals, maps to if/else if chains, with replicators; supports multi-statement bodies (declarations scoped before process)
     9→- **WHILE** — Loops, maps to Go `for` loops; supports multi-statement bodies
    10→- **CASE** — Pattern matching with multiple cases and ELSE branch; supports multi-statement bodies
    11→- **ALT** — Channel alternation, maps to Go `select`; supports boolean guards, timer timeouts, and multi-statement bodies
    12→- **SKIP** — No-op process
    13→- **STOP** — Error + deadlock
    14→
    15→### Data Types & Declarations
    16→- **INT, BYTE, BOOL, REAL, REAL32, REAL64** — Scalar types (REAL/REAL64 map to float64, REAL32 maps to float32)
    17→- **Variable declarations** — `INT x, y, z:`
    18→- **Arrays** — `[n]TYPE arr:` with index expressions
    19→- **Channels** — `CHAN OF TYPE c:` with send (`!`) and receive (`?`); `CHAN BYTE` shorthand (without `OF`)
    20→- **Channel arrays** — `[n]CHAN OF TYPE cs:` with indexed send/receive and `[]CHAN OF TYPE` proc params
    21→- **Channel direction** — `CHAN OF INT c?` (receive-only) and `CHAN OF INT c!` (send-only); direction annotations at call sites (`out!`, `in?`) accepted and ignored
    22→- **Timers** — `TIMER tim:` with reads and `AFTER` expressions
    23→- **Abbreviations** — `VAL INT x IS 1:`, `INT y IS z:` — named constants and aliases
    24→- **INITIAL declarations** — `INITIAL INT x IS 42:` — mutable variables with initial values
    25→- **Byte literals** — `'A'`, `'0'` with occam escape sequences (`*n`, `*c`, `*t`)
    26→- **Hex integer literals** — `#FF`, `#80000000`
    27→
    28→### Procedures & Functions
    29→- **PROC** — Declaration with VAL, reference, CHAN OF, and open array (`[]TYPE`) parameters
    30→- **PROC calls** — With automatic `&`/`*` for reference params, pass-through for channels
    31→- **FUNCTION (IS form)** — `INT FUNCTION square(VAL INT x) IS x * x`
    32→- **FUNCTION (VALOF form)** — Local declarations + VALOF body + RESULT
    33→- **Multi-result FUNCTIONs** — `INT, INT FUNCTION f(...)` returning multiple values via `RESULT a, b`
    34→- **Nested PROCs/FUNCTIONs** — Local definitions inside a PROC body, compiled as Go closures
    35→- **KRoC-style colon terminators** — Optional `:` at end of PROC/FUNCTION body
    36→- **Built-in print** — `print.int`, `print.bool`, `print.string`, `print.newline`
    37→
    38→### Expressions & Operators
    39→- **Arithmetic** — `+`, `-`, `*`, `/`, `\` (modulo)
    40→- **Comparison** — `=`, `<>`, `<`, `>`, `<=`, `>=`
    41→- **Logical** — `AND`, `OR`, `NOT`
    42→- **Bitwise** — `/\`, `\/`, `><`, `~`, `<<`, `>>`
    43→- **AFTER** — As boolean expression (maps to `>`)
    44→- **Parenthesized expressions**
    45→- **Array indexing** — `arr[i]`, `arr[expr]`
    46→- **String literals** — Double-quoted strings
    47→- **Type conversions** — `INT expr`, `BYTE expr`, `REAL32 expr`, `REAL64 expr`
    48→- **Checked arithmetic** — `PLUS`, `MINUS`, `TIMES` — modular (wrapping) operators
    49→- **MOSTNEG/MOSTPOS** — Type min/max constants for INT, BYTE, REAL32, REAL64
    50→- **SIZE operator** — `SIZE arr`, `SIZE "str"` maps to `len()`
    51→- **Array slices** — `[arr FROM n FOR m]` with slice assignment
    52→- **Multi-assignment** — `a, b := f(...)` including indexed targets like `x[0], x[1] := x[1], x[0]`
    53→
    54→### Protocols
    55→- **Simple** — `PROTOCOL SIG IS INT` (type alias)
    56→- **Sequential** — `PROTOCOL PAIR IS INT ; BYTE` (struct)
    57→- **Variant** — `PROTOCOL MSG CASE tag; TYPE ...` (interface + concrete types)
    58→
    59→### Records
    60→- **RECORD** — Struct types with field access via bracket syntax (`p[x]`)
    61→
    62→### Preprocessor
    63→- **`#IF` / `#ELSE` / `#ENDIF`** — Conditional compilation with `TRUE`, `FALSE`, `DEFINED()`, `NOT`, equality
    64→- **`#DEFINE`** — Symbol definition
    65→- **`#INCLUDE`** — File inclusion with search paths and include guards
    66→- **`#COMMENT` / `#PRAGMA` / `#USE`** — Ignored (blank lines)
    67→- **Predefined symbols** — `TARGET.BITS.PER.WORD = 64`
    68→
    69→### Tooling
    70→- **gen-module** — Generate `.module` files from KRoC SConscript build files
    71→
    72→---
    73→
    74→## Not Yet Implemented
    75→
    76→### Required for shared_screen module (extends course module)
    77→
    78→| Feature | Notes | Used in |
    79→|---------|-------|---------|
    80→| **`DATA TYPE X IS TYPE:`** | Simple type alias (e.g. `DATA TYPE COLOUR IS BYTE:`). | shared_screen.inc |
    81→| **`DATA TYPE X RECORD`** | Alternative record syntax (vs current `RECORD X`). | shared_screen.inc |
    82→| **Counted array protocol** | `BYTE::[]BYTE` — length-prefixed array in protocols. | shared_screen.inc, shared_screen.occ |
    83→| **`RESULT` param qualifier** | `RESULT INT len` on PROC params (output-only, like a write-only reference). | float_io.occ |
    84→
    85→### Other language features
    86→
    87→| Feature | Notes |
    88→|---------|-------|
    89→| **PRI ALT / PRI PAR** | Priority variants of ALT and PAR. |
    90→| **PLACED PAR** | Assigning processes to specific hardware. |
    91→| **PORT OF** | Hardware port mapping. |
    92→| **`RETYPES`** | Type punning / reinterpret cast (`VAL INT X RETYPES X :`). Used in float_io.occ. |
    93→| **`CAUSEERROR ()`** | Built-in error-raising primitive. Used in float_io.occ. |
    94→| **Transputer intrinsics** | `LONGPROD`, `LONGDIV`, `LONGSUM`, `LONGDIFF`, `NORMALISE`, `SHIFTLEFT`, `SHIFTRIGHT`. Used in float_io.occ. |
    95→| **`VAL []BYTE` abbreviations** | `VAL []BYTE cmap IS "0123456789ABCDEF":` — named string constants. |
    96→| **`#PRAGMA DEFINED`** | Compiler hint to suppress definedness warnings. Can be ignored. |
    97→

598

  line 2097: expected IS, got IDENT
  line 2097: unexpected token: :
  line 2101: expected type after VAL, got IDENT
  line 2101: unexpected token: :
  line 2101: unexpected token: INT
  line 2101: unexpected token: IS
  line 2102: expected type after VAL, got IDENT
  line 2102: unexpected token: :
  line 2102: unexpected token: INT
  line 2102: unexpected token: IS
  line 2103: expected type after VAL, got IDENT
  line 2103: unexpected token: :
  line 2103: unexpected token: INT
  line 2103: unexpected token: IS
  line 2104: expected type after VAL, got IDENT
  line 2104: unexpected token: :
  line 2104: unexpected token: INT
  line 2104: unexpected token: IS
  line 2107: expected type after VAL, got IDENT
  line 2107: unexpected token: :
  line 2107: unexpected token: INT
  line 2107: unexpected token: IS
  line 2108: expected type after VAL, got IDENT
  line 2108: unexpected token: :
  line 2108: unexpected token: INT
  line 2108: unexpected token: IS
  line 2109: expected type after VAL, got IDENT
  line 2109: unexpected token: :
  line 2109: unexpected token: INT
  line 2109: unexpected token: IS

   125→  -- V1.5, 15-Nov-90 SRH
   126→  -- Changed the names of some variables in QuickLog to make code
   127→  -- clearer; 28-Nov-90 SRH
   128→  -- Added assignment to zero of Carry in ScaleX when overflow to
   129→  -- infinity; this prevents possible addition of 1 to infinity to
   130→  -- make a NaN; V1.6, 4-Dec-90 SRH
   131→  --}}}
   132→  --{{{  more information
   133→  -- To help understand the binary to character conversion see "Contributions
   134→  -- to a Proposed Standard for Binary Floating-Point Arithmetic" by J T Coonen,
   135→  -- PhD thesis, 1984, University of California, Berkeley.
   136→  --}}}
   137→
   138→  #IF (TARGET.BITS.PER.WORD = 32)
   139→  VAL INT X RETYPES X :
   140→
   141→  --{{{  Definitions
   142→  --{{{  Word length specific values for 32 bit machine
   143→  VAL SignBit      IS #80000000 :
   144→  VAL BitsPerWord  IS        32 :
   145→  VAL MaxInt       IS #FFFFFFFF :
   146→  VAL BytesPerWord IS         4 :
   147→  --}}}
   148→  --{{{  IEEE Single length constants for 32 bit implementation
   149→  VAL RealShift  IS         8 :
   150→  VAL BitsInFrac IS        24 :
   151→  VAL RealExpSh  IS        23 :
   152→  VAL RealExp    IS       255 :
   153→  VAL RealXcess  IS       127 :
   154→  VAL RealRBit   IS       128 :
   155→  VAL RealInf    IS #7F800000 :
   156→  --}}}
   157→  --{{{  read/write constants
   158→  -- write number constants
   159→  VAL Table10 IS    13 :  --exact power of ten in word
   160→  VAL Bias10  IS     3 :  --extras for full power ten range
   161→  VAL MaxDecN IS     9 :  --maximum dec digits; IEEE sec. 5.6
   162→  VAL R2L     IS #4D10 :  --Log10(2) = 0.3010299956639811952 in low half word
   163→  
   164→  -- The table PowerTenFrac contains the fraction with implicit bit
   165→  -- explicit and then normalized so that there is a one bit in bit 31
   166→  -- of powers of 10 from 10^0 to 10^13.  For example,
   167→  -- 10^3 = 1111101000 in binary, which is 1.111101 * 2^9; so the fraction
   168→  -- bits, with implicit bit explicit ( ie the 1 before the point kept ) is
   169→  -- 1111101, and the actual exponent is 9.  This latter ( the actual
   170→  -- exponent ) is what is in the corresponding table PowerTenExp.
   171→  -- The index of an entry is the same as the power of 10; hence
   172→  -- PowerTenFrac[ 3 ] = #FA000000, and PowerTenExp[ 3 ] = 9.
   173→  -- No bits are lost in the PowerTenFrac table; even the largest value,
   174→  -- 10^13, is exact.
   175→  -- These two tables of constants are simply set up in advance for
   176→  -- efficiency.
   177→  
   178→  VAL PowerTenFrac IS [#80000000, #A0000000, #C8000000, #FA000000,
   179→                       #9C400000, #C3500000, #F4240000, #98968000,
   180→                       #BEBC2000, #EE6B2800, #9502F900, #BA43B740,
   181→                       #E8D4A510, #9184E72A] :
   182→  
   183→  VAL PowerTenExp IS [0, 3, 6, 9, 13, 16, 19, 23, 26, 29, 33, 36, 39, 43] :
   184→  
   185→  VAL BiasTenFrac IS [#9184E72A, #CECB8F28, #EB194F8E] : --P13, P27, P40
   186→  
   187→  VAL BiasTenExp IS [43, 89, 132] :
   188→  
   189→  VAL BiasTen IS [14, 28, 41, 54] : --bias changeover points
   190→  --}}}
   191→  --{{{  rounding constants
   192→  VAL INT rounded.down IS -1 :
   193→  VAL INT exact        IS  0 :
   194→  VAL INT rounded.up   IS  1 :
   195→  --}}}
   196→  --}}}
   197→  --{{{  ScaleX
   198→  PROC ScaleX (INT Xexp, Xfrac, VAL INT Scale, INT direction)
   199→  
   200→    -- Scale X by value of 10^Scale
   201→  
   202→    INT Carry, Places, Sb, St, Zexp, Zfrac :
   203→    SEQ
   204→      --{{{  get abs value of Scale
   205→      IF
   206→        Scale < 0
   207→          St := -Scale
   208→        TRUE
   209→          St := Scale
   210→      --}}}
   211→      --{{{  set Zexp and Zfrac
   212→      IF
   213→        St <= Table10
   214→          --{{{  easy case, 10 in table
   215→          SEQ
   216→            Zexp := PowerTenExp[St]
   217→            Zfrac := PowerTenFrac[St]
   218→          --}}}
   219→        St = (BiasTen[1] - 1)
   220→          --{{{  special case
   221→          SEQ
   222→            Zexp := BiasTenExp[1]
   223→            Zfrac := BiasTenFrac[1]
   224→          --}}}

139:  VAL INT X RETYPES X :
1105:  VAL [2]INT X RETYPES X :

1105:  VAL [2]INT X RETYPES X :
1172:  --{{{  INT, INT, INT FUNCTION RealIMul (VAL [2]INT X, Y)
1191:  --{{{  INT, INT, INT FUNCTION RealIMul (VAL [2]INT X, Y)
1192:  INT, INT, INT FUNCTION RealIMul (VAL [2]INT X, Y)
1250:  INT, INT, INT FUNCTION RealIDiv (VAL INT Hi, Lo, Guard, VAL [2]INT Yfrac)
1450:  PROC QuickLog (INT LogX, VAL INT Xexp, VAL [2]INT Xfrac)
1598:  PROC WriteDec ([]BYTE Buf, INT Length, VAL []INT Num)

[Showing results with pagination = limit: 20, offset: 0]

242:                  Zfrac, Carry := LONGPROD (PowerTenFrac[St],
244:                  Places, Zfrac, Carry := NORMALISE (Zfrac, Carry)
269:            Xfrac, Carry := LONGDIV (Xfrac >> 1, 0, Zfrac)
272:            -- set.  This means that the smallest that Xfrac as answer to the LONGDIV
278:            --Borrow, dummy := LONGDIFF (Carry, Zfrac >> 1, 0) --see if over half left
291:                Carry, remainder := LONGDIV( Carry, 0, Zfrac )
300:            Xfrac, Carry := LONGPROD (Xfrac, Zfrac, 0)
304:      Places, Xfrac, Carry := NORMALISE (Xfrac, Carry)
316:            Carry, Xfrac := LONGSUM (Xfrac, 1, 0)
343:      dummy, X := SHIFTRIGHT (Xexp, Xfrac << 1, BitsPerWord / 2)
348:            X, low.word   := LONGPROD (-X, R2L + 1, 0)
349:            Borrow, dummy := LONGDIFF (0, low.word, 0)
350:            Borrow, LogX  := LONGDIFF (0, X, Borrow)
352:          LogX, dummy := LONGPROD (X, R2L, 0)       --mul by Log10(2)
379:      Xint, Guard := SHIFTRIGHT (Xfrac, 0, Places)
409:      ExpExtra, Xfrac := SHIFTLEFT (0, Xint, Places)
441:          N, T := LONGDIV (0, N, 10) --effects N := N / 10 ; T := N REM 10
601:        Xexp, Xfrac := SHIFTLEFT (0, X /\ (~SignBit), RealShift + 1)
700:                    Places, Xfrac, Carry := NORMALISE (Xfrac, 0)
738:              Carry, M := LONGDIFF (Xfrac, PowerTenFrac[N], 0)
988:  CAUSEERROR ()
1207:        Carry,  D[0] := LONGPROD ( X[0],  Y[0],  0)
1208:        Carry,  D[1] := LONGPROD ( X[0],  Y[1],  Carry)
1209:        D[3],   D[2] := LONGPROD ( X[1],  Y[0],  0)
1210:        R.hi,   R.lo := LONGPROD ( X[1],  Y[1],  Carry)
1211:        Carry, Guard := LONGSUM ( D[2],  D[1],  0)
1212:        Carry,  R.lo := LONGSUM ( R.lo,  D[3],  Carry)
1213:        Carry,  R.hi := LONGSUM ( R.hi,  0,  Carry)
1279:            Quot,  Carry := LONGDIV ( Hi,  Lo,  Yfrac[1] )
1283:              W[1],  W[0] := LONGPROD ( Quot,  Yfrac[0],  0 )

[Showing results with pagination = limit: 30, offset: 0]

  1095→  -- infinity; this prevents possible addition of 1 to infinity to
  1096→  -- make a NaN; V1.5, 4-Dec-90 SRH
  1097→  --}}}
  1098→  --{{{  more information
  1099→  -- To help understand the binary to character conversion see "Contributions
  1100→  -- to a Proposed Standard for Binary Floating-Point Arithmetic" by J T Coonen,
  1101→  -- PhD thesis, 1984, University of California, Berkeley.
  1102→  --}}}
  1103→
  1104→  #IF (TARGET.BITS.PER.WORD = 32)
  1105→  VAL [2]INT X RETYPES X :
  1106→
  1107→  --{{{  Definitions
  1108→  --{{{  Word length specific values for 32 bit machine
  1109→  VAL SignBit        IS #80000000 :
  1110→  VAL BitsPerWord    IS        32 :
  1111→  VAL MaxUnsignedInt IS #FFFFFFFF :
  1112→  VAL BytesPerWord   IS         4 :
  1113→  --}}}
  1114→  --{{{  IEEE Double length constants for 32 bit implementation
  1115→  VAL DRealShift  IS        11 :
  1116→  VAL DBitsInFrac IS        53 :
  1117→  VAL DRealExpSh  IS        20 :
  1118→  VAL DRealExp    IS      #7FF :
  1119→  VAL DRealXcess  IS      1023 :
  1120→  VAL DRealRBit   IS      #400 :
  1121→  VAL DRealInf    IS #7FF00000 :
  1122→  --}}}
  1123→  --{{{  read/write constants
  1124→  -- write number constants
  1125→  VAL Table10 IS    27 :  --exact power of ten in word
  1126→  VAL Bias10  IS     4 :  --extras for full power ten range
  1127→  VAL MaxDecN IS    17 :  --maximum dec digits; IEEE 754-1985, Sec 5.6
  1128→  VAL R2L     IS #4D10 :  --Log10(2) = 0.3010299956639811952 in low half word
  1129→  
  1130→  -- The table PowerTenFrac contains the fraction with implicit bit
  1131→  -- explicit and then normalized so that there is a one bit in bit 31
  1132→  -- of powers of 10 from 10^0 to 10^27.  For example,
  1133→  -- 10^3 = 1111101000 in binary, which is 1.111101 * 2^9; so the fraction
  1134→  -- bits, with implicit bit explicit ( ie the 1 before the point kept ) is
  1135→  -- 1111101, and the actual exponent is 9.  This latter ( the actual
  1136→  -- exponent ) is what is in the corresponding table PowerTenExp.
  1137→  -- The index of an entry is the same as the power of 10 in
  1138→  -- PowerTenExp; hence PowerTenExp[ 3 ] = 9.  For PowerTenFrac twice
  1139→  -- the power of 10 gives the index of the lower word of the fraction,
  1140→  -- the upper word being in the next element; hence
  1141→  -- PowerTenFrac[ 2 * 3 ] = #00000000 and
  1142→  -- PowerTenFrac[ 2 * 3 + 1 ] = #FA000000.
  1143→  -- These two tables of constants are simply set up in advance for
  1144→  -- efficiency.
  1145→  VAL PowerTenFrac IS [#00000000, #80000000, #00000000, #A0000000,
  1146→   #00000000, #C8000000, #00000000, #FA000000, #00000000, #9C400000,
  1147→   #00000000, #C3500000, #00000000, #F4240000, #00000000, #98968000,
  1148→   #00000000, #BEBC2000, #00000000, #EE6B2800, #00000000, #9502F900,
  1149→   #00000000, #BA43B740, #00000000, #E8D4A510, #00000000, #9184E72A,
  1150→   #80000000, #B5E620F4, #A0000000, #E35FA931, #04000000, #8E1BC9BF,
  1151→   #C5000000, #B1A2BC2E, #76400000, #DE0B6B3A, #89E80000, #8AC72304,
  1152→   #AC620000, #AD78EBC5, #177A8000, #D8D726B7, #6EAC9000, #87867832,
  1153→   #0A57B400, #A968163F, #CCEDA100, #D3C21BCE, #401484A0, #84595161,
  1154→   #9019A5C8, #A56FA5B9, #F4200F3A, #CECB8F27] :

Entered plan mode. You should now focus on exploring the codebase and designing an implementation approach.

In plan mode, you should:
1. Thoroughly explore the codebase to understand existing patterns
2. Identify similar features and architectural approaches
3. Consider multiple approaches and their trade-offs
4. Use AskUserQuestion if you need to clarify the approach
5. Design a concrete implementation strategy
6. When ready, use ExitPlanMode to present your plan for approval

Remember: DO NOT write or edit any files yet. This is a read-only exploration and planning phase.

[
  {
    "type": "text",
    "text": "Perfect! Now I have all the information I need. Let me compile a comprehensive report.\n\n## Comprehensive Parser Code Exploration Report\n\nBased on my thorough analysis of `/home/david/projects/code-associates/occam2go/parser/parser.go`, here are the exact findings for each of your requested areas:\n\n---\n\n### 1. VAL Abbreviation Parsing\n\n**Function:** `parseAbbreviation()` (lines 315-366)\n**Related:** `parseVarDeclOrAbbreviation()` (lines 262-313)\n\nThe VAL abbreviation is parsed when the parser encounters the `VAL` token at line 164-165:\n```go\ncase lexer.VAL:\n    return p.parseAbbreviation()\n```\n\n**Key Code (lines 318-366):**\n```go\nfunc (p *Parser) parseAbbreviation() *ast.Abbreviation {\n    token := p.curToken // VAL token\n    \n    p.nextToken()\n    \n    // Check for []TYPE (open array abbreviation)\n    isOpenArray := false\n    if p.curTokenIs(lexer.LBRACKET) && p.peekTokenIs(lexer.RBRACKET) {\n        isOpenArray = true\n        p.nextToken() // consume ]\n        p.nextToken() // move to type\n    }\n    \n    // Expect a type keyword\n    if !isTypeToken(p.curToken.Type) {\n        p.addError(fmt.Sprintf(\"expected type after VAL, got %s\", p.curToken.Type))\n        return nil\n    }\n    typeName := p.curToken.Literal\n    \n    // Expect name\n    if !p.expectPeek(lexer.IDENT) {\n        return nil\n    }\n    name := p.curToken.Literal\n    \n    // Expect IS\n    if !p.expectPeek(lexer.IS) {\n        return nil\n    }\n    \n    // Parse expression\n    p.nextToken()\n    value := p.parseExpression(LOWEST)\n    \n    // Expect colon\n    if !p.expectPeek(lexer.COLON) {\n        return nil\n    }\n    \n    return &ast.Abbreviation{\n        Token:       token,\n        IsVal:       true,\n        IsOpenArray: isOpenArray,\n        Type:        typeName,\n        Name:        name,\n        Value:       value,\n    }\n}\n```\n\n**Examples handled:**\n- `VAL INT x IS 42:` → Open array flag = false, Type = \"INT\", Name = \"x\", Value = parsed expression\n- `VAL []BYTE s IS \"hi\":` → Open array flag = true, Type = \"BYTE\", Name = \"s\", Value = string literal\n\n**Non-VAL abbreviations** (like `INT y IS z:`) are handled separately in `parseVarDeclOrAbbreviation()` at lines 274-289, which creates an `Abbreviation` struct with `IsVal: false`.\n\n---\n\n### 2. Expression Parsing - Prefix Triggers\n\n**Main Function:** `parseExpression()` (lines 2525-2678)\n\nThe switch statement at lines 2528-2655 defines all prefix token triggers:\n\n```go\nswitch p.curToken.Type {\ncase lexer.IDENT:              // Line 2529\n    if p.peekTokenIs(lexer.LPAREN) {\n        left = p.parseFuncCallExpr()\n    } else {\n        left = &ast.Identifier{Token: p.curToken, Value: p.curToken.Literal}\n    }\ncase lexer.INT:                // Line 2535\n    // Parse integer literal\ncase lexer.TRUE:               // Line 2548\n    left = &ast.BooleanLiteral{Token: p.curToken, Value: true}\ncase lexer.FALSE:              // Line 2550\n    left = &ast.BooleanLiteral{Token: p.curToken, Value: false}\ncase lexer.STRING:             // Line 2552\n    left = &ast.StringLiteral{Token: p.curToken, Value: p.curToken.Literal}\ncase lexer.BYTE_LIT:           // Line 2554\n    // Parse byte literal\ncase lexer.LPAREN:             // Line 2561\n    // Parenthesized expression\ncase lexer.MINUS, lexer.MINUS_KW:  // Line 2567\n    // Unary minus\ncase lexer.NOT:                // Line 2575\n    // Logical NOT\ncase lexer.BITNOT:             // Line 2583\n    // Bitwise NOT (~)\ncase lexer.LBRACKET:           // Line 2591\n    // Slice expression: [arr FROM start FOR length]\ncase lexer.SIZE_KW:            // Line 2621\n    // SIZE operator\ncase lexer.MOSTNEG_KW, lexer.MOSTPOS_KW:  // Line 2628\n    // Min/max value constants\ncase lexer.INT_TYPE, lexer.BYTE_TYPE, lexer.BOOL_TYPE, \n    lexer.REAL_TYPE, lexer.REAL32_TYPE, lexer.REAL64_TYPE:  // Line 2644\n    // Type conversion prefix\n```\n\n**Infix Operators** (lines 2657-2675):\nThe parser loops through infix operators when precedence allows:\n```go\ncase lexer.PLUS, lexer.MINUS, lexer.MULTIPLY, lexer.DIVIDE, lexer.MODULO,\n    lexer.PLUS_KW, lexer.MINUS_KW, lexer.TIMES,\n    lexer.EQ, lexer.NEQ, lexer.LT, lexer.GT, lexer.LE, lexer.GE,\n    lexer.AND, lexer.OR, lexer.AFTER,\n    lexer.BITAND, lexer.BITOR, lexer.BITXOR, lexer.LSHIFT, lexer.RSHIFT:\n    p.nextToken()\n    left = p.parseBinaryExpr(left)\ncase lexer.LBRACKET:\n    p.nextToken()\n    left = p.parseIndexExpression(left)\n```\n\n---\n\n### 3. Multi-line Constructs & Paren Suppression\n\n**Lexer Level:** `/home/david/projects/code-associates/occam2go/lexer/lexer.go`\n\nThe lexer tracks `parenDepth` (line 21) and suppresses INDENT/DEDENT/NEWLINE inside parentheses:\n\n```go\n// Lines 68-70: Suppress INDENT inside parens\nif l.parenDepth > 0 {\n    // Inside parentheses: suppress INDENT/DEDENT tokens\n}\n\n// Lines 96-100: Track parenthesis depth\ncase '(':\n    l.parenDepth++\n    tok = l.newToken(LPAREN, l.ch)\ncase ')':\n    if l.parenDepth > 0 {\n        l.parenDepth--\n    }\n\n// Lines 220-223: Suppress NEWLINE inside parens\nif l.parenDepth > 0 {\n    // Inside parentheses: suppress NEWLINE, get next real token\n    return l.NextToken()\n}\n```\n\n**Parser Level:** Multi-line parameter lists are handled at lines 1900-1905 in `parseProcParams()`:\n```go\nfor {\n    // Skip newlines inside parameter lists (multi-line params)\n    // Note: INDENT/DEDENT/NEWLINE inside (...) are suppressed by the lexer\n    for p.curTokenIs(lexer.NEWLINE) {\n        p.nextToken()\n    }\n```\n\n**Multi-line expressions work because:**\n- Expressions inside `(...)` have NEWLINE/INDENT/DEDENT suppressed at the lexer level\n- Function calls use `parseFuncCallExpr()` (lines 2294-2321), which handles arguments separated by commas\n- The parser doesn't see indentation-related tokens inside parens, so it can parse multi-line expressions naturally\n\n---\n\n### 4. Multi-Return Assignment Parsing\n\n**Function:** `parseMultiAssignment()` (line 426) and `parseMultiAssignmentFrom()` (lines 434-469)\n\nTriggered when parsing an IDENT statement and the peek token is COMMA (line 213-214):\n```go\nif p.peekTokenIs(lexer.COMMA) {\n    return p.parseMultiAssignment()\n}\n```\n\n**Full Code (lines 426-469):**\n```go\nfunc (p *Parser) parseMultiAssignment() *ast.MultiAssignment {\n    firstTarget := ast.MultiAssignTarget{Name: p.curToken.Literal}\n    return p.parseMultiAssignmentFrom(firstTarget)\n}\n\nfunc (p *Parser) parseMultiAssignmentFrom(firstTarget ast.MultiAssignTarget) *ast.MultiAssignment {\n    stmt := &ast.MultiAssignment{\n        Targets: []ast.MultiAssignTarget{firstTarget},\n    }\n    \n    // Parse comma-separated targets: a, b[i], c\n    for p.peekTokenIs(lexer.COMMA) {\n        p.nextToken() // consume comma\n        p.nextToken() // move to next target\n        target := ast.MultiAssignTarget{Name: p.curToken.Literal}\n        if p.peekTokenIs(lexer.LBRACKET) {\n            p.nextToken() // move to [\n            p.nextToken() // move past [\n            target.Index = p.parseExpression(LOWEST)\n            if !p.expectPeek(lexer.RBRACKET) {\n                return nil\n            }\n        }\n        stmt.Targets = append(stmt.Targets, target)\n    }\n    \n    p.nextToken() // move to :=\n    stmt.Token = p.curToken\n    \n    p.nextToken() // move past :=\n    \n    // Parse comma-separated values\n    stmt.Values = []ast.Expression{p.parseExpression(LOWEST)}\n    for p.peekTokenIs(lexer.COMMA) {\n        p.nextToken() // consume comma\n        p.nextToken() // move to next expression\n        stmt.Values = append(stmt.Values, p.parseExpression(LOWEST))\n    }\n    \n    return stmt\n}\n```\n\n**Supports:**\n- `a, b := func(...)` — multi-result function calls\n- `x[0], x[1] := x[1], x[0]` — indexed multi-assignment (target.Index handling at lines 444-450)\n\n---\n\n### 5. Transputer Intrinsics & CAUSEERROR Recognition\n\n**Current Status:** NOT YET IMPLEMENTED as keywords\n\nChecked in `/home/david/projects/code-associates/occam2go/lexer/token.go` (lines 1-244):\n- No token types exist for: `LONGPROD`, `LONGDIV`, `LONGSUM`, `LONGDIFF`, `NORMALISE`, `SHIFTRIGHT`, `SHIFTLEFT`, `CAUSEERROR`\n- These would be recognized as **IDENT tokens** (line 14, 239-243):\n\n```go\n// From token.go line 239-243:\nfunc LookupIdent(ident string) TokenType {\n    if tok, ok := keywords[ident]; ok {\n        return tok\n    }\n    return IDENT  // <- These intrinsics fall through here\n}\n```\n\n**How to add them:**\n\n1. **In `/home/david/projects/code-associates/occam2go/lexer/token.go`:**\n   - Add token types between lines 92-96 (after TIMES, before keyword_end)\n   - Add to `tokenNames` map (lines 99-184)\n   - Add to `keywords` map (lines 186-230)\n\n2. **In Parser:**\n   - They would be recognized as **function-like identifiers in prefix position**\n   - When parser sees `LONGPROD(a, b)`, it triggers `parseFuncCallExpr()` (line 2294) because:\n     - `case lexer.IDENT:` at line 2529 matches (if they're IDENT)\n     - `if p.peekTokenIs(lexer.LPAREN)` at line 2530 would be true\n     - Could also make them keywords and add `case` branches in `parseExpression()` to handle them like type conversions\n\n---\n\n## Summary Table\n\n| Area | Location | Key Functions | Lines |\n|------|----------|---|-------|\n| **VAL Abbreviations** | parser.go | `parseAbbreviation()`, `parseVarDeclOrAbbreviation()` | 315-366, 262-313 |\n| **Expression Parsing - Prefix** | parser.go | `parseExpression()` | 2525-2655 |\n| **Expression Parsing - Infix** | parser.go | `parseExpression()`, `parseBinaryExpr()` | 2657-2692 |\n| **Paren Suppression** | lexer.go | `NextToken()` (parenDepth tracking) | 68-70, 96-100, 220-223 |\n| **Multi-line Params** | parser.go | `parseProcParams()` | 1900-1905 |\n| **Multi-Assignment** | parser.go | `parseMultiAssignment()`, `parseMultiAssignmentFrom()` | 426-469 |\n| **Transputer Intrinsics** | token.go | (NOT YET IMPLEMENTED) | - |\n| **Current Keywords** | token.go | `keywords` map, PLUS_KW, MINUS_KW, TIMES | 186-230 |\n\nAll file paths are absolute: `/home/david/projects/code-associates/occam2go/`"
  },
  {
    "type": "text",
    "text": "agentId: ad6fa5e (for resuming to continue this agent's work if needed)\n<usage>total_tokens: 69406\ntool_uses: 18\nduration_ms: 48424</usage>"
  }
]

[
  {
    "type": "text",
    "text": "Perfect! Now I have all the information I need. Let me create a comprehensive report:\n\n## Comprehensive Exploration Report: AST, Codegen, and Lexer Analysis\n\n### 1. AST Node Types for Type Information (ast/ast.go)\n\n#### VarDecl Structure (lines 36-44)\n```go\ntype VarDecl struct {\n\tToken lexer.Token // the type token (INT, BYTE, BOOL)\n\tType  string      // \"INT\", \"BYTE\", \"BOOL\", etc.\n\tNames []string    // variable names (can declare multiple: INT x, y, z:)\n}\n```\n**Key insight**: VarDecl always stores an explicit type in the `Type` field (string). There's no mechanism for type-inferred/implicit declarations currently—all VarDecl nodes must have an explicit type.\n\n#### Abbreviation Structure (lines 484-496)\n```go\ntype Abbreviation struct {\n\tToken       lexer.Token // VAL, INITIAL, or type token\n\tIsVal       bool        // true for VAL abbreviations\n\tIsInitial   bool        // true for INITIAL declarations\n\tIsOpenArray bool        // true for []TYPE abbreviations (e.g. VAL []BYTE)\n\tType        string      // \"INT\", \"BYTE\", \"BOOL\", etc.\n\tName        string      // variable name\n\tValue       Expression  // the expression\n}\n```\n**Key insight**: Abbreviations also have explicit `Type` string. They use flags (`IsVal`, `IsInitial`, `IsOpenArray`) to distinguish variants. No type-inference mechanism exists.\n\n---\n\n### 2. Abbreviation Codegen (codegen/codegen.go)\n\n#### Package-Level Abbreviations (lines 179-190)\nAt the top-level (package scope), abbreviations are generated as package-level `var` declarations:\n\n```go\n// Generate package-level abbreviations (constants)\nfor _, stmt := range abbrDecls {\n\tabbr := stmt.(*ast.Abbreviation)\n\tgoType := g.occamTypeToGo(abbr.Type)\n\tif abbr.IsOpenArray {\n\t\tgoType = \"[]\" + goType\n\t}\n\tg.builder.WriteString(\"var \")\n\tg.write(fmt.Sprintf(\"%s %s = \", goIdent(abbr.Name), goType))\n\tg.generateExpression(abbr.Value)\n\tg.write(\"\\n\")\n}\n```\n\n**Type determination**: Uses `g.occamTypeToGo(abbr.Type)` to convert Occam type string (\"INT\", \"BYTE\", etc.) to Go type (\"int\", \"byte\", etc.). Open arrays get prefix `[]`.\n\n#### Local-Scope Abbreviations (lines 776-781)\n```go\nfunc (g *Generator) generateAbbreviation(abbr *ast.Abbreviation) {\n\tg.builder.WriteString(strings.Repeat(\"\\t\", g.indent))\n\tg.write(fmt.Sprintf(\"%s := \", goIdent(abbr.Name)))\n\tg.generateExpression(abbr.Value)\n\tg.write(\"\\n\")\n}\n```\n\n**Key point**: Local abbreviations use short `:=` syntax (relying on Go's type inference). The `Type` field from the Occam AST is NOT used in the generated Go code—Go infers the type from the RHS expression.\n\n#### occamTypeToGo Function (lines 1155-1180)\n```go\nfunc (g *Generator) occamTypeToGo(occamType string) string {\n\tswitch occamType {\n\tcase \"INT\":\n\t\treturn \"int\"\n\tcase \"BYTE\":\n\t\treturn \"byte\"\n\tcase \"BOOL\":\n\t\treturn \"bool\"\n\tcase \"REAL\":\n\t\treturn \"float64\"\n\tcase \"REAL32\":\n\t\treturn \"float32\"\n\tcase \"REAL64\":\n\t\treturn \"float64\"\n\tdefault:\n\t\t// Check if it's a protocol name\n\t\tif _, ok := g.protocolDefs[occamType]; ok {\n\t\t\treturn \"_proto_\" + occamType\n\t\t}\n\t\t// Check if it's a record type name\n\t\tif _, ok := g.recordDefs[occamType]; ok {\n\t\t\treturn occamType\n\t\t}\n\t\treturn occamType // pass through unknown types\n\t}\n}\n```\n\n**Mapping**: Simple 1:1 string mapping with special cases for protocol and record types.\n\n---\n\n### 3. goIdent() Function (lines 51-55)\n```go\n// goIdent converts an occam identifier to a valid Go identifier.\n// Occam allows dots in identifiers (e.g., out.repeat); Go does not.\nfunc goIdent(name string) string {\n\treturn strings.ReplaceAll(name, \".\", \"_\")\n}\n```\n\n**Usage**: Applied to all identifier outputs—variable names, function names, etc. Replaces `.` with `_` everywhere identifiers appear in generated code (~30+ locations).\n\n---\n\n### 4. Type Conversion Generation (lines 1939-1943)\nIn `generateExpression()`:\n\n```go\ncase *ast.TypeConversion:\n\tg.write(g.occamTypeToGo(e.TargetType))\n\tg.write(\"(\")\n\tg.generateExpression(e.Expr)\n\tg.write(\")\")\n```\n\n**Pattern**: Generates `<GoType>(<expr>)`, e.g., `int(x)`, `float32(y)`.\n\n---\n\n### 5. MOSTNEG/MOSTPOS Expression Generation (lines 666-693)\n```go\nfunc (g *Generator) generateMostExpr(e *ast.MostExpr) {\n\tswitch e.ExprType {\n\tcase \"INT\":\n\t\tif e.IsNeg {\n\t\t\tg.write(\"math.MinInt\")\n\t\t} else {\n\t\t\tg.write(\"math.MaxInt\")\n\t\t}\n\tcase \"BYTE\":\n\t\tif e.IsNeg {\n\t\t\tg.write(\"0\")\n\t\t} else {\n\t\t\tg.write(\"255\")\n\t\t}\n\tcase \"REAL32\":\n\t\tif e.IsNeg {\n\t\t\tg.write(\"-math.MaxFloat32\")\n\t\t} else {\n\t\t\tg.write(\"math.MaxFloat32\")\n\t\t}\n\tcase \"REAL64\":\n\t\tif e.IsNeg {\n\t\t\tg.write(\"-math.MaxFloat64\")\n\t\t} else {\n\t\t\tg.write(\"math.MaxFloat64\")\n\t\t}\n\t}\n}\n```\n\n**Import management**: Uses `math` package for INT/REAL types. Detected via `containsMostExpr()` (line 519) → sets `g.needMath = true` (line 88).\n\n---\n\n### 6. Import Detection Pattern (containsX functions)\n\n**containsMostExpr** (lines 519-632): Recursively scans AST for MostExpr nodes.\n- Returns true if found (excluding BYTE, which uses literals 0/255)\n- Triggers import of `math` package (line 88-90)\n\n**exprNeedsMath** (lines 634-664): Helper that checks expressions:\n```go\nfunc (g *Generator) exprNeedsMath(expr ast.Expression) bool {\n\tif expr == nil {\n\t\treturn false\n\t}\n\tswitch e := expr.(type) {\n\tcase *ast.MostExpr:\n\t\t// BYTE uses literal 0/255, doesn't need math\n\t\treturn e.ExprType != \"BYTE\"\n\tcase *ast.BinaryExpr:\n\t\treturn g.exprNeedsMath(e.Left) || g.exprNeedsMath(e.Right)\n\t// ... recursive checks for UnaryExpr, ParenExpr, TypeConversion, etc.\n\t}\n\treturn false\n}\n```\n\n**Pattern for other imports**:\n- `containsPar()` (line 230) → sets `g.needSync = true` (imports `sync.WaitGroup`)\n- `containsPrint()` (line 297) → sets `g.needFmt = true` (imports `fmt`)\n- `containsTimer()` (line 370) → sets `g.needTime = true` (imports `time`)\n- `containsStop()` (line 446) → sets `g.needOs = true` (imports `os`)\n\nAll flags checked in first pass (lines 74-90), then imports written at the top.\n\n---\n\n### 7. Tokens Available (lexer/token.go)\n\n#### Existing Tokens (relevant to your Phase 2 needs)\n\n**Type Tokens (lines 77-82)**:\n```\nINT_TYPE, BYTE_TYPE, BOOL_TYPE, REAL_TYPE, REAL32_TYPE, REAL64_TYPE\n```\n\n**Arithmetic Keywords (lines 93-95)**:\n```\nPLUS_KW, MINUS_KW, TIMES  // distinct from + - * symbols\n```\n\n**Constants (lines 90-92)**:\n```\nMOSTNEG_KW, MOSTPOS_KW, INITIAL\n```\n\n#### Missing Tokens for Phase 2\nCurrently, **no tokens exist** for:\n- RETYPES\n- LONGPROD, LONGDIV, LONGSUM, LONGDIFF\n- NORMALISE, SHIFTRIGHT, SHIFTLEFT\n- CAUSEERROR\n\n**To add new tokens**, follow the pattern in token.go:\n1. Add TokenType constant (within `keyword_beg`/`keyword_end` range for keywords)\n2. Add entry to `tokenNames` map (line 99+)\n3. Add entry to `keywords` map (line 186+) if it's a keyword\n\nExample:\n```go\n// In const block after INITIAL\nRETYPES      // (or as a keyword)\nLONGPROD     // keyword\nLONGDIV      // keyword\n// ... etc\n\n// In tokenNames map\nRETYPES: \"RETYPES\",\nLONGPROD: \"LONGPROD\",\n// ...\n\n// In keywords map (if keyword)\n\"RETYPES\": RETYPES,\n\"LONGPROD\": LONGPROD,\n// ...\n```\n\n---\n\n### 8. E2E Test Pattern (codegen/e2e_helpers_test.go & e2e_basic_test.go)\n\n#### Helper Function (lines 14-62 of e2e_helpers_test.go)\n```go\nfunc transpileCompileRun(t *testing.T, occamSource string) string {\n\tt.Helper()\n\n\t// Transpile\n\tl := lexer.New(occamSource)\n\tp := parser.New(l)\n\tprogram := p.ParseProgram()\n\n\tif len(p.Errors()) > 0 {\n\t\tfor _, err := range p.Errors() {\n\t\t\tt.Errorf(\"parser error: %s\", err)\n\t\t}\n\t\tt.FailNow()\n\t}\n\n\tgen := New()\n\tgoCode := gen.Generate(program)\n\n\t// Create temp directory for this test\n\ttmpDir, err := os.MkdirTemp(\"\", \"occam2go-test-*\")\n\tif err != nil {\n\t\tt.Fatalf(\"failed to create temp dir: %v\", err)\n\t}\n\tdefer os.RemoveAll(tmpDir)\n\n\t// Write Go source\n\tgoFile := filepath.Join(tmpDir, \"main.go\")\n\tif err := os.WriteFile(goFile, []byte(goCode), 0644); err != nil {\n\t\tt.Fatalf(\"failed to write Go file: %v\", err)\n\t}\n\n\t// Compile\n\tbinFile := filepath.Join(tmpDir, \"main\")\n\tcompileCmd := exec.Command(\"go\", \"build\", \"-o\", binFile, goFile)\n\tcompileOutput, err := compileCmd.CombinedOutput()\n\tif err != nil {\n\t\tt.Fatalf(\"compilation failed: %v\\nOutput: %s\\nGo code:\\n%s\", err, compileOutput, goCode)\n\t}\n\n\t// Run\n\trunCmd := exec.Command(binFile)\n\toutput, err := runCmd.CombinedOutput()\n\tif err != nil {\n\t\tt.Fatalf(\"execution failed: %v\\nOutput: %s\", err, output)\n\t}\n\n\treturn string(output)\n}\n```\n\n#### Example Test (lines 8-18 of e2e_basic_test.go)\n```go\nfunc TestE2E_PrintInt(t *testing.T) {\n\toccam := `SEQ\n  INT x:\n  x := 42\n  print.int(x)\n`\n\toutput := transpileCompileRun(t, occam)\n\texpected := \"42\\n\"\n\tif output != expected {\n\t\tt.Errorf(\"expected %q, got %q\", expected, output)\n\t}\n}\n```\n\n**Pattern for new tests**:\n1. Define Occam source as a string\n2. Call `transpileCompileRun(t, occamSource)` to get stdout\n3. Compare with expected output\n4. File organized by feature: `e2e_basic_test.go`, `e2e_array_test.go`, `e2e_proc_func_test.go`, `e2e_protocol_test.go`, etc.\n\n---\n\n### 9. Abbreviation Parser (parser/parser.go, lines 315-410)\n\n#### VAL Abbreviation Parsing (lines 318-366)\n```go\nfunc (p *Parser) parseAbbreviation() *ast.Abbreviation {\n\ttoken := p.curToken // VAL token\n\n\tp.nextToken()\n\n\t// Check for []TYPE (open array abbreviation)\n\tisOpenArray := false\n\tif p.curTokenIs(lexer.LBRACKET) && p.peekTokenIs(lexer.RBRACKET) {\n\t\tisOpenArray = true\n\t\tp.nextToken() // consume ]\n\t\tp.nextToken() // move to type\n\t}\n\n\t// Expect a type keyword\n\tif !isTypeToken(p.curToken.Type) {\n\t\tp.addError(fmt.Sprintf(\"expected type after VAL, got %s\", p.curToken.Type))\n\t\treturn nil\n\t}\n\ttypeName := p.curToken.Literal\n\n\t// Expect name\n\tif !p.expectPeek(lexer.IDENT) {\n\t\treturn nil\n\t}\n\tname := p.curToken.Literal\n\n\t// Expect IS\n\tif !p.expectPeek(lexer.IS) {\n\t\treturn nil\n\t}\n\n\t// Parse expression\n\tp.nextToken()\n\tvalue := p.parseExpression(LOWEST)\n\n\t// Expect colon\n\tif !p.expectPeek(lexer.COLON) {\n\t\treturn nil\n\t}\n\n\treturn &ast.Abbreviation{\n\t\tToken:       token,\n\t\tIsVal:       true,\n\t\tIsOpenArray: isOpenArray,\n\t\tType:        typeName,\n\t\tName:        name,\n\t\tValue:       value,\n\t}\n}\n```\n\n**Key points**:\n- Explicit type always captured (`typeName` from token literal)\n- Open array flag set if `[]` precedes type\n- VAL keyword triggers `IsVal = true`\n\n#### INITIAL Declaration Parsing (lines 370-410)\nSimilar structure, but sets `IsInitial = true` and `IsVal = false` (default).\n\n---\n\n### Summary Table: File Locations and Key Functions\n\n| Question | File | Function/Line | Key Detail |\n|----------|------|---------------|-----------|\n| VarDecl type storage | ast/ast.go:36-44 | VarDecl.Type (string) | Explicit type always |\n| Abbreviation type storage | ast/ast.go:484-496 | Abbreviation.Type (string) | Explicit type always |\n| Package-level abbr codegen | codegen/codegen.go:179-190 | Generate() | Uses occamTypeToGo() |\n| Local-scope abbr codegen | codegen/codegen.go:776-781 | generateAbbreviation() | Uses Go type inference (:=) |\n| Type conversion | codegen/codegen.go:1939-1943 | generateExpression() case TypeConversion | Direct cast: `<Type>(<expr>)` |\n| MOSTNEG/MOSTPOS generation | codegen/codegen.go:666-693 | generateMostExpr() | Outputs math.MinInt/MaxInt/etc. |\n| MOSTNEG/MOSTPOS import detection | codegen/codegen.go:519-632 | containsMostExpr() + exprNeedsMath() | Recursive AST scan |\n| goIdent() function | codegen/codegen.go:51-55 | goIdent() | Replaces `.` with `_` |\n| Type mapping | codegen/codegen.go:1155-1180 | occamTypeToGo() | INT→int, BYTE→byte, etc. |\n| Token definitions | lexer/token.go:1-252 | TokenType enum + maps | RETYPES/LONGPROD missing |\n| E2E test framework | codegen/e2e_helpers_test.go:14-62 | transpileCompileRun() | Lexer→Parser→Codegen→Compile→Run |\n| E2E test example | codegen/e2e_basic_test.go:8-18 | TestE2E_PrintInt() | String input, output comparison |\n| Abbreviation parser | parser/parser.go:315-366 | parseAbbreviation() | Explicit type parsing |\n| INITIAL parser | parser/parser.go:370-410 | parseInitialDecl() | Similar to VAL, IsInitial flag |"
  },
  {
    "type": "text",
    "text": "agentId: a7fd81e (for resuming to continue this agent's work if needed)\n<usage>total_tokens: 75622\ntool_uses: 22\nduration_ms: 57384</usage>"
  }
]

[
  {
    "type": "text",
    "text": "Excellent! Now I have all the information I need. Let me provide a comprehensive report:\n\n## Comprehensive Catalog of float_io.occ Language Constructs\n\nI've thoroughly analyzed `/home/david/projects/code-associates/occam2go/kroc/modules/course/libsrc/float_io.occ` (2269 lines). Here are ALL the constructs that need implementation:\n\n---\n\n### 1. RETYPES Declarations (2 occurrences)\n\n**Line 139:** Single-word RETYPES (32-bit float)\n```\n#IF (TARGET.BITS.PER.WORD = 32)\nVAL INT X RETYPES X :\n```\n- Type retyped: `INT` to `INT` (bit-level reinterpretation of X as X)\n- Use case: Type aliasing for bit manipulation\n\n**Line 1105:** Two-word RETYPES (64-bit double)\n```\n#IF (TARGET.BITS.PER.WORD = 32)\nVAL [2]INT X RETYPES X :\n```\n- Type retyped: `[2]INT` to `[2]INT` (two-word array retyped as array)\n- Use case: Type aliasing for 64-bit values on 32-bit systems\n\n---\n\n### 2. Untyped VAL Abbreviations (45 occurrences)\n\nAll 45 are **simple scalar** hex or decimal constants (no array literals):\n\n**Hex scalar constants:**\n- Line 143: `VAL SignBit IS #80000000 :`\n- Line 145: `VAL MaxInt IS #FFFFFFFF :`\n- Line 155: `VAL RealInf IS #7F800000 :`\n- Line 162: `VAL R2L IS #4D10 :`\n- Line 1109: `VAL SignBit IS #80000000 :`\n- Line 1111: `VAL MaxUnsignedInt IS #FFFFFFFF :`\n- Line 1118: `VAL DRealExp IS #7FF :`\n- Line 1120: `VAL DRealRBit IS #400 :`\n- Line 1121: `VAL DRealInf IS #7FF00000 :`\n- Line 1128: `VAL R2L IS #4D10 :`\n\n**Decimal scalar constants:**\n- Line 144: `VAL BitsPerWord IS 32 :`\n- Line 146: `VAL BytesPerWord IS 4 :`\n- Line 149-155: RealExpSh, BitsInFrac, RealExpSh, RealExp, RealXcess, RealRBit (6 constants)\n- Line 159-161: Table10, Bias10, MaxDecN (3 constants)\n- Line 1110, 1112-1127: Similar set for 64-bit (26 total in this section)\n\n---\n\n### 3. VAL Array Literal Abbreviations (4 occurrences)\n\n**Line 178-181:** Single-word array with 14 elements\n```\nVAL PowerTenFrac IS [#80000000, #A0000000, #C8000000, #FA000000,\n                     #9C400000, #C3500000, #F4240000, #98968000,\n                     #BEBC2000, #EE6B2800, #9502F900, #BA43B740,\n                     #E8D4A510, #9184E72A] :\n```\n\n**Line 183:** Integer array with 14 elements\n```\nVAL PowerTenExp IS [0, 3, 6, 9, 13, 16, 19, 23, 26, 29, 33, 36, 39, 43] :\n```\n\n**Line 185:** Single-word array with 3 elements\n```\nVAL BiasTenFrac IS [#9184E72A, #CECB8F28, #EB194F8E] :\n```\n\n**Line 187:** Integer array with 3 elements\n```\nVAL BiasTenExp IS [43, 89, 132] :\n```\n\n**Line 189:** Integer array with 4 elements\n```\nVAL BiasTen IS [14, 28, 41, 54] :\n```\n\n**Lines 1145-1160 (64-bit versions):** Similar arrays, larger (28-element PowerTenFrac, 28-element PowerTenExp, 10-element BiasTenFrac, 5-element BiasTenExp, 5-element BiasTen)\n\n---\n\n### 4. Multi-line Boolean Expressions (2 major occurrences)\n\n**Lines 522-527:** Complex rounding condition\n```\nround.up :=  ( direction = exact ) AND\n             ( ( Buf[digits - 1] = '1' ) OR\n               ( Buf[digits - 1] = '3' ) OR\n               ( Buf[digits - 1] = '5' ) OR\n               ( Buf[digits - 1] = '7' ) OR\n               ( Buf[digits - 1] = '9' ) )\n```\n\n**Lines 754-757 and 779-782:** Complex if condition with nested AND/OR\n```\n( (Ip <> 0) AND (LogX < Ip) ) OR\n  ((Dp = 0) AND\n   (((-max.no.of.zeroes.before.first.significant.digit) - 1) <= LogX) AND\n   (LogX < N))\n```\n\n**Lines 1710-1715:** Similar multi-line boolean to line 522-527 (64-bit version)\n\n---\n\n### 5. Transputer Intrinsic Calls (57 total)\n\n**LONGPROD - 16 occurrences:**\n- Line 242: `Zfrac, Carry := LONGPROD (PowerTenFrac[St], BiasTenFrac[Sb], 0)` — 2-result\n- Line 300: `Xfrac, Carry := LONGPROD (Xfrac, Zfrac, 0)` — 2-result\n- Line 348: `X, low.word := LONGPROD (-X, R2L + 1, 0)` — 2-result\n- Line 352: `LogX, dummy := LONGPROD (X, R2L, 0)` — 2-result\n- Line 1207-1210: Four `LONGPROD` calls in 64-bit multiplication (2-result each)\n- Line 1283-1284: Two `LONGPROD` calls in division (2-result each)\n- Line 1470: `X, low.word := LONGPROD (-X, R2L + 1, 0)` — 2-result\n- Line 1474: `LogX, dummy := LONGPROD (X, R2L, 0)` — 2-result\n\n**LONGDIV - 11 occurrences:**\n- Line 269: `Xfrac, Carry := LONGDIV (Xfrac >> 1, 0, Zfrac)` — 2-result\n- Line 291: `Carry, remainder := LONGDIV( Carry, 0, Zfrac )` — 2-result\n- Line 441: `N, T := LONGDIV (0, N, 10)` — 2-result\n- Line 1279: `Quot, Carry := LONGDIV ( Hi, Lo, Yfrac[1] )` — 2-result\n- Line 1627-1628: Two `LONGDIV` in 64-bit division (2-result each)\n- Line 1471-1472: Two `LONGDIFF` (not LONGDIV, but similar)\n\n**LONGSUM - 9 occurrences:**\n- Line 316: `Carry, Xfrac := LONGSUM (Xfrac, 1, 0)` — 2-result\n- Line 1211-1213: Three `LONGSUM` calls in 64-bit arithmetic (2-result each)\n- Line 1291-1293: Three `LONGSUM` calls in loop (2-result each)\n- Line 1358-1359: Two `LONGSUM` calls (2-result each)\n- Line 1437-1438: Two `LONGSUM` calls (2-result each)\n- Line 1521-1522, 1528-1529, 1533-1534: Three pairs (6 total) in rounding (2-result each)\n\n**LONGDIFF - 11 occurrences:**\n- Line 278 (commented): `Borrow, dummy := LONGDIFF (Carry, Zfrac >> 1, 0)` — 2-result\n- Line 349-350: Two `LONGDIFF` calls (2-result each)\n- Line 738: `Carry, M := LONGDIFF (Xfrac, PowerTenFrac[N], 0)` — 2-result\n- Line 1285-1287: Three `LONGDIFF` in division (2-result each)\n- Line 1471-1472: Two `LONGDIFF` in exponent calc (2-result each)\n- Line 1923-1924, 1939-1940: Four `LONGDIFF` in 64-bit comparison (2-result each)\n\n**NORMALISE - 6 occurrences (3-result signature):**\n- Line 244: `Places, Zfrac, Carry := NORMALISE (Zfrac, Carry)` — 3-result\n- Line 304: `Places, Xfrac, Carry := NORMALISE (Xfrac, Carry)` — 3-result\n- Line 700: `Places, Xfrac, Carry := NORMALISE (Xfrac, 0)` — 3-result\n- Line 1350: `Places, Zfrac[1], dummy := NORMALISE (Zfrac[1], Zfrac[0])` — 3-result\n- Line 1424: `Places, Xfrac[1], dummy := NORMALISE (Xfrac[1], Xfrac[0])` — 3-result\n- Line 1890: `Places, Xfrac[1], Xfrac[0] := NORMALISE (Xfrac[1], Xfrac[0])` — 3-result\n\n**SHIFTRIGHT - 8 occurrences (2-3 result patterns):**\n- Line 343: `dummy, X := SHIFTRIGHT (Xexp, Xfrac << 1, BitsPerWord / 2)` — 2-result\n- Line 379: `Xint, Guard := SHIFTRIGHT (Xfrac, 0, Places)` — 2-result\n- Line 1390: `Xfrac[1], Xfrac[0] := SHIFTRIGHT (Xfrac[1], Xfrac[0], 1)` — 2-result\n- Line 1398 (commented): `Zfrac[1], Zfrac[0] := SHIFTRIGHT (Zfrac[1], Zfrac[0], 1)` — 2-result\n- Line 1465: `dummy, X := SHIFTRIGHT (Xexp, Xfrac[1] << 1, BitsPerWord / 2)` — 2-result\n- Line 1504-1505: Two calls (2-result each)\n- Line 1547: `Xint[0], Guard := SHIFTRIGHT (Xfrac[1], Xfrac[0], Places)` — 2-result\n\n**SHIFTLEFT - 6 occurrences (2-3 result patterns):**\n- Line 409: `ExpExtra, Xfrac := SHIFTLEFT (0, Xint, Places)` — 2-result\n- Line 601: `Xexp, Xfrac := SHIFTLEFT (0, X /\\ (~SignBit), RealShift + 1)` — 2-result\n- Line 1351: `Zfrac[0], Guard := SHIFTLEFT (Zfrac[0], Guard, Places)` — 2-result\n- Line 1425: `Xfrac[0], Guard := SHIFTLEFT (Xfrac[0], Guard, Places)` — 2-result\n- Line 1539: `Carry, dummy := SHIFTLEFT (0, Xint[1], Places)` — 2-result\n- Line 1585: `Carry, Xfrac[1] := SHIFTLEFT (Xint[1], Xint[0], Places)` — 2-result\n- Line 1786: `Xexp, Xfrac[1] := SHIFTLEFT (0, X[1] /\\ (~SignBit), DRealShift + 1)` — 2-result\n- Line 1889, 1894: Two more calls (2-result each)\n- Line 2229: `C, W := SHIFTLEFT (0, W, 4)` — 2-result\n\n---\n\n### 6. CAUSEERROR Calls (2 occurrences)\n\n**Line 988:** Inside `#ELSE` branch (32-bit single precision fallback)\n```\n#ELSE\nCAUSEERROR ()\n#ENDIF\n```\n\n**Line 2187:** Inside `#ELSE` branch (64-bit double precision fallback)\n```\n#ELSE\nCAUSEERROR ()\n#ENDIF\n```\n\nContext: These are reached when `TARGET.BITS.PER.WORD <> 32`, meaning 64-bit or other word sizes not supported.\n\n---\n\n### 7. Other Notable Constructs\n\n**Conditional Compilation:** The entire file is structured around `#IF (TARGET.BITS.PER.WORD = 32)` blocks:\n- Lines 138-989: 32-bit single precision (REAL32)\n- Lines 1104-2189: 64-bit double precision (REAL64)\n\n**Array Indexing:** Extensive use of array indexing with expressions:\n- `PowerTenFrac[St]`, `PowerTenFrac[N]`, `BiasTenFrac[Sb]`\n- `Zfrac[1]`, `Xfrac[0]`, `X[1]`, `Y[0]`\n- `D[0]`, `D[1]`, `D[2]`, `D[3]`\n- `PowerTenFrac[N + N]`, `PowerTenFrac[(N + N) + 1]`\n\n**Nested Array Indexing:** Field access via bracket notation on multi-word values (treating structured data as indexed arrays)\n\n**Comment Syntax:** Extensive use of `--{{{`, `--}}}` for code folding markers (these are just comments and should parse fine)\n\n---\n\n## Summary of Implementation Priority for Phase 2\n\n**Must Implement (Blocking):**\n1. **RETYPES** (2 patterns: `VAL INT X RETYPES X` and `VAL [2]INT X RETYPES X`)\n2. **Transputer intrinsics** (57 calls total):\n   - LONGPROD (16 calls, 2-result)\n   - LONGDIV (11 calls, 2-result)\n   - LONGSUM (9 calls, 2-result)\n   - LONGDIFF (11 calls, 2-result)\n   - NORMALISE (6 calls, 3-result signature)\n   - SHIFTRIGHT (8 calls, 2-result)\n   - SHIFTLEFT (9 calls, 2-result)\n3. **CAUSEERROR()** (2 calls in #ELSE branches)\n\n**Already Implemented:**\n- VAL array literals (45 simple scalar declarations + 6 array literal declarations)\n- Multi-line boolean expressions with AND/OR\n- Array indexing and field access\n- Conditional compilation (#IF blocks)\n- All other occam features used in context\n\nNo PRI ALT, PRI PAR, PLACED PAR, or PORT OF constructs found in this file."
  },
  {
    "type": "text",
    "text": "agentId: ab495da (for resuming to continue this agent's work if needed)\n<usage>total_tokens: 38797\ntool_uses: 24\nduration_ms: 62246</usage>"
  }
]

   315→// parseAbbreviation parses a VAL abbreviation: VAL INT x IS expr:
   316→// Also handles VAL []BYTE x IS "string": (open array abbreviation)
   317→// Current token is VAL.
   318→func (p *Parser) parseAbbreviation() *ast.Abbreviation {
   319→	token := p.curToken // VAL token
   320→
   321→	p.nextToken()
   322→
   323→	// Check for []TYPE (open array abbreviation)
   324→	isOpenArray := false
   325→	if p.curTokenIs(lexer.LBRACKET) && p.peekTokenIs(lexer.RBRACKET) {
   326→		isOpenArray = true
   327→		p.nextToken() // consume ]
   328→		p.nextToken() // move to type
   329→	}
   330→
   331→	// Expect a type keyword
   332→	if !isTypeToken(p.curToken.Type) {
   333→		p.addError(fmt.Sprintf("expected type after VAL, got %s", p.curToken.Type))
   334→		return nil
   335→	}
   336→	typeName := p.curToken.Literal
   337→
   338→	// Expect name
   339→	if !p.expectPeek(lexer.IDENT) {
   340→		return nil
   341→	}
   342→	name := p.curToken.Literal
   343→
   344→	// Expect IS
   345→	if !p.expectPeek(lexer.IS) {
   346→		return nil
   347→	}
   348→
   349→	// Parse expression
   350→	p.nextToken()
   351→	value := p.parseExpression(LOWEST)
   352→
   353→	// Expect colon
   354→	if !p.expectPeek(lexer.COLON) {
   355→		return nil
   356→	}
   357→
   358→	return &ast.Abbreviation{
   359→		Token:       token,
   360→		IsVal:       true,
   361→		IsOpenArray: isOpenArray,
   362→		Type:        typeName,
   363→		Name:        name,
   364→		Value:       value,
   365→	}
   366→}
   367→
   368→// parseInitialDecl parses an INITIAL declaration: INITIAL INT x IS expr:
   369→// Current token is INITIAL.
   370→func (p *Parser) parseInitialDecl() *ast.Abbreviation {
   371→	token := p.curToken // INITIAL token
   372→
   373→	// Expect a type keyword
   374→	p.nextToken()
   375→	if !p.curTokenIs(lexer.INT_TYPE) && !p.curTokenIs(lexer.BYTE_TYPE) &&
   376→		!p.curTokenIs(lexer.BOOL_TYPE) && !p.curTokenIs(lexer.REAL_TYPE) &&
   377→		!p.curTokenIs(lexer.REAL32_TYPE) && !p.curTokenIs(lexer.REAL64_TYPE) {
   378→		p.addError(fmt.Sprintf("expected type after INITIAL, got %s", p.curToken.Type))
   379→		return nil
   380→	}
   381→	typeName := p.curToken.Literal
   382→
   383→	// Expect name
   384→	if !p.expectPeek(lexer.IDENT) {
   385→		return nil
   386→	}
   387→	name := p.curToken.Literal
   388→
   389→	// Expect IS
   390→	if !p.expectPeek(lexer.IS) {
   391→		return nil
   392→	}
   393→
   394→	// Parse expression
   395→	p.nextToken()
   396→	value := p.parseExpression(LOWEST)
   397→
   398→	// Expect colon
   399→	if !p.expectPeek(lexer.COLON) {
   400→		return nil
   401→	}
   402→
   403→	return &ast.Abbreviation{
   404→		Token:     token,
   405→		IsInitial: true,
   406→		Type:      typeName,
   407→		Name:      name,
   408→		Value:     value,
   409→	}
   410→}
   411→
   412→func (p *Parser) parseAssignment() *ast.Assignment {
   413→	stmt := &ast.Assignment{
   414→		Name: p.curToken.Literal,

   515→                -- and digit before 5 is odd; else leave as is
   516→                IF
   517→                  digits = 0
   518→                    round.up := FALSE
   519→                  direction = rounded.down
   520→                    round.up := TRUE
   521→                  TRUE
   522→                    round.up :=  ( direction = exact ) AND
   523→                                 ( ( Buf[digits - 1] = '1' ) OR
   524→                                   ( Buf[digits - 1] = '3' ) OR
   525→                                   ( Buf[digits - 1] = '5' ) OR
   526→                                   ( Buf[digits - 1] = '7' ) OR
   527→                                   ( Buf[digits - 1] = '9' ) )
   528→              TRUE
   529→                round.up := Buf[digits] >= '5'
   530→            --}}}
   531→            IF
   532→              round.up
   533→                --{{{  round up
   534→                SEQ

   748→                  SKIP
   749→              --}}}
   750→              WriteDec (Buf, Places, Xint)              --get number string
   751→              --{{{  output the string in the correct format
   752→              --{{{  fractional mode
   753→              IF
   754→                ( (Ip <> 0) AND (LogX < Ip) ) OR
   755→                  ((Dp = 0) AND
   756→                   (((-max.no.of.zeroes.before.first.significant.digit) - 1) <= LogX) AND
   757→                   (LogX < N))
   758→                  --{{{  try to output in mmm.nnnn form
   759→                  SEQ
   760→                    --{{{  possibly restrict
   761→                    M := (Dp + LogX) + 1                --current estimate at actual field width
   762→                    IF
   763→                      M < 0                             --must ensure that M >= 0
   764→                        M := 0
   765→                      TRUE
   766→                        SKIP
   767→                    #PRAGMA DEFINED Buf
   768→                    SEQ i = 0 FOR Places
   769→                      Buf.1[i] := Buf[i]
   770→                    Places.1 := Places
   771→                    LogX.1 := LogX
   772→                    IF
   773→                      Dp <> 0                           --fixed point if possible
   774→                        restrict (Buf.1, Places.1, LogX.1, M, round.direction)
   775→                      TRUE                              --free format
   776→                        SKIP
   777→                    --}}}
   778→                    IF
   779→                      ( (Ip <> 0) AND (LogX.1 < Ip) ) OR
   780→                        ((Dp = 0) AND
   781→                         (((-max.no.of.zeroes.before.first.significant.digit) - 1) <= LogX.1) AND
   782→                         (LogX.1 < N))
   783→                        --{{{  output in mmm.nnnn form
   784→                        SEQ
   785→                          --{{{  set Scale
   786→                          IF
   787→                            LogX.1 < 0                  --always 0decimal.point

170-			return p.parseFuncDecl()
171-		}
172-		return p.parseVarDeclOrAbbreviation()
173:	case lexer.LBRACKET:
174-		return p.parseArrayDecl()
175-	case lexer.CHAN:
176-		return p.parseChanDecl()
--
2588-			Operator: "~",
2589-			Right:    p.parseExpression(PREFIX),
2590-		}
2591:	case lexer.LBRACKET:
2592-		/ Slice expression: [arr FROM start FOR length] or [arr FOR length]
2593-		lbracket := p.curToken
2594-		p.nextToken() // move past [
--
2666-			lexer.BITAND, lexer.BITOR, lexer.BITXOR, lexer.LSHIFT, lexer.RSHIFT:
2667-			p.nextToken()
2668-			left = p.parseBinaryExpr(left)
2669:		case lexer.LBRACKET:
2670-			p.nextToken()
2671-			left = p.parseIndexExpression(left)
2672-		default:

19-
20-	/ Parenthesis depth: suppress INDENT/DEDENT/NEWLINE inside (...)
21:	parenDepth int
22-}
23-
--
66-		currentIndent := l.indentStack[len(l.indentStack)-1]
67-
68:		if l.parenDepth > 0 {
69-			/ Inside parentheses: suppress INDENT/DEDENT tokens
70-			// (don't modify indentStack — resume normal tracking after close paren)
--
94-	switch l.ch {
95-	case '(':
96:		l.parenDepth++
97-		tok = l.newToken(LPAREN, l.ch)
98-	case ')':
99:		if l.parenDepth > 0 {
100:			l.parenDepth--
101-		}
102-		tok = l.newToken(RPAREN, l.ch)
--
218-			}
219-		}
220:		if l.parenDepth > 0 {
221-			/ Inside parentheses: suppress NEWLINE, get next real token
222-			return l.NextToken()

  2591→	case lexer.LBRACKET:
  2592→		// Slice expression: [arr FROM start FOR length] or [arr FOR length]
  2593→		lbracket := p.curToken
  2594→		p.nextToken() // move past [
  2595→		arrayExpr := p.parseExpression(LOWEST)
  2596→		var startExpr ast.Expression
  2597→		if p.peekTokenIs(lexer.FOR) {
  2598→			// [arr FOR length] shorthand — start is 0
  2599→			startExpr = &ast.IntegerLiteral{Token: lexer.Token{Type: lexer.INT, Literal: "0"}, Value: 0}
  2600→		} else {
  2601→			if !p.expectPeek(lexer.FROM) {
  2602→				return nil
  2603→			}
  2604→			p.nextToken() // move past FROM
  2605→			startExpr = p.parseExpression(LOWEST)
  2606→		}
  2607→		if !p.expectPeek(lexer.FOR) {
  2608→			return nil
  2609→		}
  2610→		p.nextToken() // move past FOR
  2611→		lengthExpr := p.parseExpression(LOWEST)
  2612→		if !p.expectPeek(lexer.RBRACKET) {
  2613→			return nil
  2614→		}
  2615→		left = &ast.SliceExpr{
  2616→			Token:  lbracket,
  2617→			Array:  arrayExpr,
  2618→			Start:  startExpr,
  2619→			Length: lengthExpr,
  2620→		}
  2621→	case lexer.SIZE_KW:
  2622→		token := p.curToken
  2623→		p.nextToken()
  2624→		left = &ast.SizeExpr{
  2625→			Token: token,
  2626→			Expr:  p.parseExpression(PREFIX),
  2627→		}
  2628→	case lexer.MOSTNEG_KW, lexer.MOSTPOS_KW:
  2629→		token := p.curToken
  2630→		isNeg := token.Type == lexer.MOSTNEG_KW

  2650→			Expr:       p.parseExpression(PREFIX),
  2651→		}
  2652→	default:
  2653→		p.addError(fmt.Sprintf("unexpected token in expression: %s", p.curToken.Type))
  2654→		return nil
  2655→	}
  2656→
  2657→	// Parse infix expressions
  2658→	for !p.peekTokenIs(lexer.NEWLINE) && !p.peekTokenIs(lexer.EOF) &&
  2659→		precedence < p.peekPrecedence() {
  2660→
  2661→		switch p.peekToken.Type {
  2662→		case lexer.PLUS, lexer.MINUS, lexer.MULTIPLY, lexer.DIVIDE, lexer.MODULO,
  2663→			lexer.PLUS_KW, lexer.MINUS_KW, lexer.TIMES,
  2664→			lexer.EQ, lexer.NEQ, lexer.LT, lexer.GT, lexer.LE, lexer.GE,
  2665→			lexer.AND, lexer.OR, lexer.AFTER,
  2666→			lexer.BITAND, lexer.BITOR, lexer.BITXOR, lexer.LSHIFT, lexer.RSHIFT:
  2667→			p.nextToken()
  2668→			left = p.parseBinaryExpr(left)
  2669→		case lexer.LBRACKET:
  2670→			p.nextToken()
  2671→			left = p.parseIndexExpression(left)
  2672→		default:
  2673→			return left
  2674→		}
  2675→	}
  2676→
  2677→	return left
  2678→}
  2679→
  2680→func (p *Parser) parseBinaryExpr(left ast.Expression) ast.Expression {
  2681→	expr := &ast.BinaryExpr{
  2682→		Token:    p.curToken,
  2683→		Left:     left,
  2684→		Operator: p.curToken.Literal,
  2685→	}
  2686→
  2687→	prec := p.curPrecedence()
  2688→	p.nextToken()
  2689→	expr.Right = p.parseExpression(prec)
  2690→
  2691→	return expr
  2692→}
  2693→

[
  {
    "type": "text",
    "text": "Here is the detailed implementation plan for Phase 2.\n\n---\n\n## Phase 2 Implementation Plan: Full Course Module Transpilation (Including float_io.occ)\n\n### Problem Statement\n\nThe transpiler currently produces 598 parse errors when processing the full `course.module` (which includes `float_io.occ`). All 598 errors trace back to 4 root causes, each a missing language feature. Fixing these 4 features will eliminate all errors.\n\n### Error Root Cause Analysis (598 total errors)\n\n| Root Cause | Direct Errors | Cascading Errors | Total |\n|---|---|---|---|\n| Untyped VAL abbreviations | 41 | ~130 | ~171 |\n| Array literal expressions | 10 | ~330 | ~340 |\n| Multi-line expression continuation | 10 | ~70 | ~80 |\n| RETYPES declarations | 2 | ~5 | ~7 |\n| **Total** | **63** | **~535** | **598** |\n\nAfter parse errors are resolved, codegen needs 3 additional features: transputer intrinsic helper functions, RETYPES code generation, and CAUSEERROR mapping.\n\n---\n\n### Feature 1: Untyped VAL Abbreviations\n\n**Occam syntax**: `VAL SignBit IS #80000000 :` (no explicit type keyword between VAL and the name)\n\n**Occurrences**: 41 direct errors on unique lines (biggest error contributor)\n\n**Files to modify**:\n\n#### 1a. Parser: `/home/david/projects/code-associates/occam2go/parser/parser.go`\n\nIn `parseAbbreviation()` (line 318), after `p.nextToken()` past VAL (line 321) and after the open-array `[]` check (lines 323-329), the code currently checks `isTypeToken(p.curToken.Type)` at line 332. When the current token is an IDENT (not a type keyword), it fails.\n\n**Change**: After the `[]` check, if `curToken` is IDENT (not a type token), check if `peekToken` is IS. If so, this is an untyped abbreviation. Parse as: `VAL <name:IDENT> IS <expr> :` with `Type = \"\"`.\n\n```go\n// After the isOpenArray check (line 329), insert:\nif p.curTokenIs(lexer.IDENT) && p.peekTokenIs(lexer.IS) {\n    // Untyped VAL abbreviation: VAL name IS expr :\n    name := p.curToken.Literal\n    p.nextToken() // consume IS\n    p.nextToken() // move past IS to expression\n    value := p.parseExpression(LOWEST)\n    if !p.expectPeek(lexer.COLON) {\n        return nil\n    }\n    return &ast.Abbreviation{\n        Token:  token,\n        IsVal:  true,\n        Type:   \"\",   // No explicit type\n        Name:   name,\n        Value:  value,\n    }\n}\n```\n\nThis must be inserted BEFORE the existing `isTypeToken` check at line 332.\n\n#### 1b. Codegen: `/home/david/projects/code-associates/occam2go/codegen/codegen.go`\n\n**Local abbreviations** (inside functions): `generateAbbreviation()` at line 776 uses `:=` which relies on Go type inference. Empty Type works here with no changes needed.\n\n**Package-level abbreviations** (lines 179-190): Currently generates `var name type = expr`. When Type is empty, this produces `var name  = expr` (double space, and Go compiler may complain about missing type for some expressions). Fix:\n\n```go\n// In the package-level abbreviation loop (line 180-189):\nif abbr.Type == \"\" {\n    g.builder.WriteString(\"var \")\n    g.write(fmt.Sprintf(\"%s = \", goIdent(abbr.Name)))\n} else {\n    goType := g.occamTypeToGo(abbr.Type)\n    if abbr.IsOpenArray {\n        goType = \"[]\" + goType\n    }\n    g.builder.WriteString(\"var \")\n    g.write(fmt.Sprintf(\"%s %s = \", goIdent(abbr.Name), goType))\n}\n```\n\n**Testing**: Parser test with `VAL x IS 42 :` and `VAL mask IS #FF :`. E2E test using an untyped VAL in a PROC body.\n\n---\n\n### Feature 2: Array Literal Expressions\n\n**Occam syntax**: `VAL PowerTenExp IS [0, 3, 6, 9, 13, 16, 19, 23, 26, 29, 33, 36, 39, 43] :` -- multi-line array literal spanning up to 10 lines.\n\n**Occurrences**: 10 `expected ], got ,` errors + ~330 cascading errors from multi-line array content.\n\n#### 2a. Lexer: `/home/david/projects/code-associates/occam2go/lexer/lexer.go`\n\nAdd `[`/`]` tracking to `parenDepth` so that NEWLINEs inside `[...]` are suppressed. This matches Python's behavior where `()`, `[]`, and `{}` all suppress implicit newlines.\n\nAt line 103-104, the `[` case currently only emits LBRACKET. Add `l.parenDepth++`:\n```go\ncase '[':\n    l.parenDepth++\n    tok = l.newToken(LBRACKET, l.ch)\n```\n\nAt line 105-106, the `]` case currently only emits RBRACKET. Add depth decrement:\n```go\ncase ']':\n    if l.parenDepth > 0 {\n        l.parenDepth--\n    }\n    tok = l.newToken(RBRACKET, l.ch)\n```\n\nThis is safe because:\n- Array indexing `arr[i]` opens and closes `[]` within a single expression, so depth returns to previous level.\n- Slice expressions `[arr FROM n FOR m]` similarly balance within an expression.\n- Array literals `[e1, e2, ...]` balance the brackets.\n- The INDENT/DEDENT suppression at line 68-70 and NEWLINE suppression at line 220-222 use the existing `parenDepth > 0` check, which now covers `[...]` too.\n\n**Caution**: The lexer's indent stack (`indentStack`) is NOT modified when `parenDepth > 0` (line 68-70). This means that after a multi-line array literal, the indent stack reflects the level before the literal, which is correct. When the `]` closes and parenDepth returns to 0, subsequent lines will be processed normally against the unchanged indent stack.\n\n#### 2b. AST: `/home/david/projects/code-associates/occam2go/ast/ast.go`\n\nAdd new `ArrayLiteral` expression node:\n\n```go\n// ArrayLiteral represents an array literal: [e1, e2, e3, ...]\ntype ArrayLiteral struct {\n    Token    lexer.Token  // the [ token\n    Elements []Expression // the elements\n}\n\nfunc (al *ArrayLiteral) expressionNode()      {}\nfunc (al *ArrayLiteral) TokenLiteral() string { return al.Token.Literal }\n```\n\n#### 2c. Parser: `/home/david/projects/code-associates/occam2go/parser/parser.go`\n\nIn `parseExpression()`, the `case lexer.LBRACKET:` (line 2591) currently assumes a slice expression. Need to detect array literals by checking: after parsing the first element, if followed by COMMA, it is an array literal. If followed by FROM or FOR, it is a slice expression.\n\nReplace the LBRACKET case (lines 2591-2620) with:\n\n```go\ncase lexer.LBRACKET:\n    lbracket := p.curToken\n    p.nextToken() // move past [\n    firstExpr := p.parseExpression(LOWEST)\n    \n    if p.peekTokenIs(lexer.COMMA) {\n        // Array literal: [expr, expr, ...]\n        elements := []ast.Expression{firstExpr}\n        for p.peekTokenIs(lexer.COMMA) {\n            p.nextToken() // consume comma\n            p.nextToken() // move to next element\n            elements = append(elements, p.parseExpression(LOWEST))\n        }\n        if !p.expectPeek(lexer.RBRACKET) {\n            return nil\n        }\n        left = &ast.ArrayLiteral{Token: lbracket, Elements: elements}\n    } else if p.peekTokenIs(lexer.FOR) {\n        // Slice shorthand: [arr FOR length]\n        startExpr := &ast.IntegerLiteral{Token: lexer.Token{Type: lexer.INT, Literal: \"0\"}, Value: 0}\n        if !p.expectPeek(lexer.FOR) { return nil }\n        p.nextToken()\n        lengthExpr := p.parseExpression(LOWEST)\n        if !p.expectPeek(lexer.RBRACKET) { return nil }\n        left = &ast.SliceExpr{Token: lbracket, Array: firstExpr, Start: startExpr, Length: lengthExpr}\n    } else if p.peekTokenIs(lexer.FROM) {\n        // Slice: [arr FROM start FOR length]\n        if !p.expectPeek(lexer.FROM) { return nil }\n        p.nextToken()\n        startExpr := p.parseExpression(LOWEST)\n        if !p.expectPeek(lexer.FOR) { return nil }\n        p.nextToken()\n        lengthExpr := p.parseExpression(LOWEST)\n        if !p.expectPeek(lexer.RBRACKET) { return nil }\n        left = &ast.SliceExpr{Token: lbracket, Array: firstExpr, Start: startExpr, Length: lengthExpr}\n    } else if p.peekTokenIs(lexer.RBRACKET) {\n        // Single-element array literal: [expr]\n        p.nextToken() // consume ]\n        left = &ast.ArrayLiteral{Token: lbracket, Elements: []ast.Expression{firstExpr}}\n    } else {\n        p.addError(fmt.Sprintf(\"expected ], FROM, FOR, or , after expression in [...], got %s\", p.peekToken.Type))\n        return nil\n    }\n```\n\n#### 2d. Codegen: `/home/david/projects/code-associates/occam2go/codegen/codegen.go`\n\nAdd `ArrayLiteral` case to `generateExpression()` (line 1880):\n\n```go\ncase *ast.ArrayLiteral:\n    g.write(\"[]int{\")\n    for i, elem := range e.Elements {\n        if i > 0 {\n            g.write(\", \")\n        }\n        g.generateExpression(elem)\n    }\n    g.write(\"}\")\n```\n\nNote: Using `[]int{...}` as the default type. Since all array literals in float_io.occ contain hex integer constants (all INT type), this is correct. For a more general solution, the type could be inferred from the context (e.g., the Abbreviation's type), but for Phase 2, `[]int` suffices.\n\nAlso add the `ArrayLiteral` case to all the `containsX` scanner functions so they recurse into array literal elements.\n\n**Testing**: Parser test for `[1, 2, 3]`, multi-line `[#FF, #80,\\n#90]`. E2E test indexing into an array literal abbreviation.\n\n---\n\n### Feature 3: Multi-line Expression Continuation\n\n**Occam pattern**: A binary operator (AND, OR, etc.) at the end of a line, with the right-hand operand on the following (more-indented) line:\n```\nround.up := ( direction = exact ) AND\n             ( ( Buf[digits - 1] = '1' ) OR ...\n```\n\n**Occurrences**: 10 `unexpected token in expression: NEWLINE` errors + ~70 cascading errors.\n\n**Key insight**: After the binary operator (AND/OR), the lexer emits NEWLINE followed by INDENT (the continuation line is indented deeper). The expression parser stops at NEWLINE, failing to parse the RHS. Once the continuation starts with `(`, subsequent inner NEWLINEs are suppressed by the lexer's paren depth tracking. So only the FIRST NEWLINE+INDENT after the operator needs handling.\n\n#### 3a. Parser: `/home/david/projects/code-associates/occam2go/parser/parser.go`\n\nModify `parseBinaryExpr()` (line 2680) to handle multi-line continuation:\n\n```go\nfunc (p *Parser) parseBinaryExpr(left ast.Expression) ast.Expression {\n    expr := &ast.BinaryExpr{\n        Token:    p.curToken,\n        Left:     left,\n        Operator: p.curToken.Literal,\n    }\n\n    prec := p.curPrecedence()\n    p.nextToken()\n\n    // Handle multi-line expression continuation:\n    // After a binary operator, skip NEWLINE and INDENT tokens to allow\n    // the RHS expression to continue on the next line.\n    extraIndents := 0\n    for p.curTokenIs(lexer.NEWLINE) || p.curTokenIs(lexer.INDENT) {\n        if p.curTokenIs(lexer.INDENT) {\n            extraIndents++\n        }\n        p.nextToken()\n    }\n\n    expr.Right = p.parseExpression(prec)\n\n    // Consume matching continuation DEDENTs to restore indent balance.\n    // After the RHS expression, the DEDENT(s) from the continuation\n    // indentation appear before the next statement's tokens.\n    for extraIndents > 0 {\n        if p.peekTokenIs(lexer.NEWLINE) {\n            p.nextToken() // skip NEWLINE before DEDENT\n        }\n        if p.peekTokenIs(lexer.DEDENT) {\n            p.nextToken() // consume DEDENT\n            extraIndents--\n        } else {\n            break\n        }\n    }\n\n    return expr\n}\n```\n\n**Why this works**:\n1. Single-line expressions: The `for` loops don't execute (curToken is not NEWLINE/INDENT after the operator).\n2. Multi-line with one continuation level: Skips one NEWLINE+INDENT (extraIndents=1). After parsing RHS, consumes matching NEWLINE+DEDENT.\n3. Nested multi-line (e.g., AND at end of line, then OR inside parens): The AND continuation is handled here. The OR lines inside `(...)` are handled by the lexer's paren depth NEWLINE suppression. No parser changes needed for the inner levels.\n4. Indent balance: The consumed INDENT increments `p.indentLevel` (via `nextToken()`). The consumed DEDENT decrements it. Net effect is zero, maintaining balance for the calling block parser.\n\n**Testing**: Parser test with multi-line `x AND\\n  y`. E2E test with multi-line IF guard using AND/OR continuation.\n\n---\n\n### Feature 4: RETYPES Declarations\n\n**Occam syntax**:\n```\nVAL INT X RETYPES X :           -- REAL32 -> INT (bit reinterpretation)\nVAL [2]INT X RETYPES X :       -- REAL64 -> [2]INT (bit reinterpretation)\n```\n\n**Occurrences**: 2 (lines 139 and 1105 of float_io.occ)\n\n#### 4a. Lexer: `/home/david/projects/code-associates/occam2go/lexer/token.go`\n\nAdd RETYPES keyword token. Insert in the keyword constants:\n```go\nRETYPES  // RETYPES keyword\n```\n\nAdd to `tokenNames` map:\n```go\nRETYPES: \"RETYPES\",\n```\n\nAdd to `keywords` map:\n```go\n\"RETYPES\": RETYPES,\n```\n\nPlace the RETYPES constant between INITIAL and PLUS_KW (or at the end of the keyword block before `keyword_end`).\n\n#### 4b. AST: `/home/david/projects/code-associates/occam2go/ast/ast.go`\n\nAdd new `RetypesDecl` statement node:\n\n```go\n// RetypesDecl represents a RETYPES declaration: VAL INT X RETYPES X :\n// or VAL [2]INT X RETYPES X :\ntype RetypesDecl struct {\n    Token      lexer.Token // VAL token\n    IsVal      bool        // always true (only VAL RETYPES in float_io.occ)\n    TargetType string      // \"INT\", \"BYTE\", etc.\n    IsArray    bool        // true for [n]TYPE RETYPES\n    ArraySize  int         // array size when IsArray (e.g., 2)\n    Name       string      // target variable name\n    Source     string      // source variable name\n}\n\nfunc (r *RetypesDecl) statementNode()       {}\nfunc (r *RetypesDecl) TokenLiteral() string { return r.Token.Literal }\n```\n\n#### 4c. Parser: `/home/david/projects/code-associates/occam2go/parser/parser.go`\n\nIn `parseAbbreviation()`, after parsing `VAL <type> <name>` (lines 336-342), instead of immediately expecting IS (line 345), check if `peekToken` is RETYPES:\n\n```go\n// After parsing type and name (line 342):\nname := p.curToken.Literal\n\n// Check for RETYPES\nif p.peekTokenIs(lexer.RETYPES) {\n    p.nextToken() // consume RETYPES\n    p.nextToken() // move to source name\n    if !p.curTokenIs(lexer.IDENT) {\n        p.addError(fmt.Sprintf(\"expected identifier after RETYPES, got %s\", p.curToken.Type))\n        return nil\n    }\n    source := p.curToken.Literal\n    if !p.expectPeek(lexer.COLON) {\n        return nil\n    }\n    return &ast.RetypesDecl{\n        Token:      token,\n        IsVal:      true,\n        TargetType: typeName,\n        Name:       name,\n        Source:     source,\n    }\n}\n\n// Expect IS (existing code at line 345)\n```\n\nAlso handle the `VAL [n]TYPE name RETYPES source :` case. In `parseAbbreviation()`, after the open-array check (line 325-329), add a fixed-size array check:\n\n```go\n// After isOpenArray check and before isTypeToken check:\nisFixedArray := false\narraySize := 0\nif p.curTokenIs(lexer.LBRACKET) && !p.peekTokenIs(lexer.RBRACKET) {\n    // Could be [n]TYPE for RETYPES\n    p.nextToken() // move past [\n    if p.curTokenIs(lexer.INT) {\n        size, _ := strconv.Atoi(p.curToken.Literal)\n        arraySize = size\n        if !p.expectPeek(lexer.RBRACKET) { return nil }\n        p.nextToken() // move to type\n        isFixedArray = true\n    }\n}\n```\n\nThen the existing type/name/RETYPES parsing continues. When creating the RetypesDecl, set `IsArray = isFixedArray` and `ArraySize = arraySize`.\n\n#### 4d. Codegen: `/home/david/projects/code-associates/occam2go/codegen/codegen.go`\n\nAdd `RetypesDecl` case to `generateStatement()`:\n\n```go\ncase *ast.RetypesDecl:\n    g.generateRetypesDecl(s)\n```\n\nImplement `generateRetypesDecl`:\n\n```go\nfunc (g *Generator) generateRetypesDecl(r *ast.RetypesDecl) {\n    g.builder.WriteString(strings.Repeat(\"\\t\", g.indent))\n    src := goIdent(r.Source)\n    dst := goIdent(r.Name)\n    \n    if r.IsArray && r.TargetType == \"INT\" {\n        // VAL [2]INT X RETYPES X : (REAL64 -> [2]INT)\n        // _bits := math.Float64bits(X)\n        // X := [2]int{int(uint32(_bits)), int(uint32(_bits >> 32))}\n        tmpName := fmt.Sprintf(\"_bits_%d\", g.tmpCounter)\n        g.tmpCounter++\n        g.write(fmt.Sprintf(\"%s := math.Float64bits(float64(%s))\\n\", tmpName, src))\n        g.builder.WriteString(strings.Repeat(\"\\t\", g.indent))\n        g.write(fmt.Sprintf(\"%s := [%d]int{int(uint32(%s)), int(uint32(%s >> 32))}\\n\",\n            dst, r.ArraySize, tmpName, tmpName))\n    } else if r.TargetType == \"INT\" {\n        // VAL INT X RETYPES X : (REAL32 -> INT)\n        // X := int(math.Float32bits(float32(X)))\n        g.write(fmt.Sprintf(\"%s := int(math.Float32bits(float32(%s)))\\n\", dst, src))\n    } else {\n        // Fallback for other RETYPES (not used in float_io.occ)\n        g.write(fmt.Sprintf(\"// TODO: RETYPES %s %s = %s\\n\", r.TargetType, dst, src))\n    }\n    g.needMath = true\n}\n```\n\nAlso add `RetypesDecl` to all `containsX` scanner functions so `needMath` is set correctly:\n- `containsMostExpr` (or add a new `containsRetypes` scanner): Return true when a RetypesDecl is found, triggering `g.needMath = true`.\n\nActually, better approach: set `g.needMath = true` directly in the first pass (line 73-106 of Generate()), by adding:\n```go\nif _, ok := stmt.(*ast.RetypesDecl); ok {\n    g.needMath = true\n}\n```\n\nAnd recursively check inside ProcDecl/FuncDecl bodies.\n\n**Testing**: Parser test for `VAL INT X RETYPES X :` and `VAL [2]INT X RETYPES X :`. Codegen test checking generated Go output contains `math.Float32bits`.\n\n---\n\n### Feature 5: Transputer Intrinsic Helper Functions\n\n**Intrinsics**: LONGPROD, LONGDIV, LONGSUM, LONGDIFF, NORMALISE, SHIFTRIGHT, SHIFTLEFT\n\n**Occurrences**: 84 calls total across float_io.occ. Used exclusively in multi-assignment context: `a, b := INTRINSIC(x, y, z)`.\n\n**No parser changes needed**: Intrinsics are syntactically identical to function calls (IDENT followed by LPAREN). The multi-assignment parser already handles them.\n\n#### 5a. Codegen: `/home/david/projects/code-associates/occam2go/codegen/codegen.go`\n\n**Intrinsic recognition**: Add a set of known intrinsic names:\n\n```go\nvar transpIntrinsics = map[string]bool{\n    \"LONGPROD\":   true,\n    \"LONGDIV\":    true,\n    \"LONGSUM\":    true,\n    \"LONGDIFF\":   true,\n    \"NORMALISE\":  true,\n    \"SHIFTRIGHT\": true,\n    \"SHIFTLEFT\":  true,\n}\n```\n\n**Function name prefixing**: In `generateFuncCallExpr()` (line 1581), check if the function name is an intrinsic. If so, prefix with `_`:\n\n```go\nfunc (g *Generator) generateFuncCallExpr(call *ast.FuncCall) {\n    name := goIdent(call.Name)\n    if transpIntrinsics[call.Name] {\n        name = \"_\" + call.Name\n    }\n    g.write(name)\n    g.write(\"(\")\n    // ... rest unchanged\n```\n\n**Helper function emission**: Add a `needMathBits` bool to the Generator struct. Add a `containsIntrinsics()` scanner (following the pattern of `containsPar()`, `containsMostExpr()`) that traverses the AST looking for FuncCall nodes with intrinsic names.\n\nIn the first pass of `Generate()` (lines 73-106), add:\n```go\nif g.containsIntrinsics(stmt) {\n    g.needMathBits = true\n}\n```\n\nAdd `\"math/bits\"` to the import block when `needMathBits` is true (line 112-134).\n\nEmit the helper functions after the import block and before type/proc declarations. The helpers should be emitted only when `needMathBits` is true:\n\n```go\nif g.needMathBits {\n    g.emitIntrinsicHelpers()\n}\n```\n\n**Helper function implementations** (all use `uint64` and `uint32` arithmetic to match transputer 32-bit word semantics):\n\n```go\nfunc (g *Generator) emitIntrinsicHelpers() {\n    helpers := `\nfunc _LONGPROD(a, b, c int) (int, int) {\n    r := uint64(uint32(a))*uint64(uint32(b)) + uint64(uint32(c))\n    return int(uint32(r >> 32)), int(uint32(r))\n}\n\nfunc _LONGDIV(hi, lo, d int) (int, int) {\n    n := (uint64(uint32(hi)) << 32) | uint64(uint32(lo))\n    return int(uint32(n / uint64(uint32(d)))), int(uint32(n % uint64(uint32(d))))\n}\n\nfunc _LONGSUM(a, b, c int) (int, int) {\n    r := uint64(uint32(a)) + uint64(uint32(b)) + uint64(uint32(c))\n    return int(uint32(r >> 32)), int(uint32(r))\n}\n\nfunc _LONGDIFF(a, b, c int) (int, int) {\n    r := int64(uint32(a)) - int64(uint32(b)) - int64(uint32(c))\n    borrow := 0\n    if r < 0 {\n        borrow = 1\n    }\n    return borrow, int(uint32(r))\n}\n\nfunc _NORMALISE(hi, lo int) (int, int, int) {\n    v := (uint64(uint32(hi)) << 32) | uint64(uint32(lo))\n    if v == 0 {\n        return 64, 0, 0\n    }\n    p := bits.LeadingZeros64(v)\n    v <<= uint(p)\n    return p, int(uint32(v >> 32)), int(uint32(v))\n}\n\nfunc _SHIFTRIGHT(hi, lo, n int) (int, int) {\n    v := (uint64(uint32(hi)) << 32) | uint64(uint32(lo))\n    v >>= uint(uint32(n))\n    return int(uint32(v >> 32)), int(uint32(v))\n}\n\nfunc _SHIFTLEFT(hi, lo, n int) (int, int) {\n    v := (uint64(uint32(hi)) << 32) | uint64(uint32(lo))\n    v <<= uint(uint32(n))\n    return int(uint32(v >> 32)), int(uint32(v))\n}\n`\n    g.builder.WriteString(helpers)\n}\n```\n\n**Testing**: E2E test calling each intrinsic with known values and checking results. For example:\n- `LONGPROD(3, 4, 5)` should return `(0, 17)` (3*4+5=17, fits in low word).\n- `NORMALISE(0, 1)` should return `(63, int(1<<31), 0)` (leading zeros of 1 in 64-bit = 63, shifted left by 63).\n\n---\n\n### Feature 6: CAUSEERROR\n\n**Occam syntax**: `CAUSEERROR ()` -- error-raising primitive.\n\n**Occurrences**: 2 in float_io.occ (lines 988 and 2187), both inside `#ELSE` branches. With `-D TARGET.BITS.PER.WORD=32`, these are preprocessed out. But implement for completeness.\n\n**No parser changes needed**: `CAUSEERROR ()` parses as a proc call (IDENT followed by LPAREN RPAREN).\n\n#### 6a. Codegen: `/home/david/projects/code-associates/occam2go/codegen/codegen.go`\n\nIn `generateProcCall()` (line 1498), add a check:\n\n```go\nfunc (g *Generator) generateProcCall(call *ast.ProcCall) {\n    // Check for CAUSEERROR\n    if call.Name == \"CAUSEERROR\" {\n        g.writeLine(`panic(\"CAUSEERROR\")`)\n        return\n    }\n    // ... rest of existing code\n```\n\n**Testing**: E2E test is not practical (CAUSEERROR panics). Codegen unit test checking the output contains `panic(\"CAUSEERROR\")`.\n\n---\n\n### Implementation Order\n\nThe features should be implemented in this specific order based on error reduction impact and dependencies:\n\n**Step 1: Lexer bracket NEWLINE suppression** (Feature 2a)\n- 2 lines changed in `lexer/lexer.go`\n- Enables array literals to lex correctly across lines\n- Quick win, unblocks Feature 2\n\n**Step 2: RETYPES keyword token** (Feature 4a)\n- 3 additions to `lexer/token.go`\n- Unblocks RETYPES parsing\n\n**Step 3: AST nodes** (Features 2b, 4b)\n- Add `ArrayLiteral` and `RetypesDecl` to `ast/ast.go`\n- Unblocks parser changes\n\n**Step 4: Untyped VAL abbreviations** (Feature 1a)\n- Parser change in `parseAbbreviation()` \n- Fixes 41 direct + ~130 cascading errors (biggest impact)\n\n**Step 5: Array literal expressions** (Feature 2c)\n- Parser change in `parseExpression()` LBRACKET case\n- Fixes 10 direct + ~330 cascading errors\n\n**Step 6: RETYPES declarations** (Feature 4c)\n- Parser change in `parseAbbreviation()`\n- Fixes 2 direct + ~5 cascading errors\n\n**Step 7: Multi-line expression continuation** (Feature 3a)\n- Parser change in `parseBinaryExpr()`\n- Fixes 10 direct + ~70 cascading errors\n- **After this step: 0 parse errors on full course module**\n\n**Step 8: Codegen - untyped VAL + array literals** (Features 1b, 2d)\n- Codegen changes for empty-type abbreviations and ArrayLiteral\n\n**Step 9: Codegen - RETYPES** (Feature 4d)\n- RETYPES code generation with `math.Float32bits` / `math.Float64bits`\n\n**Step 10: Codegen - intrinsic helpers** (Feature 5)\n- Intrinsic recognition + helper function emission\n- Most complex codegen change\n\n**Step 11: Codegen - CAUSEERROR** (Feature 6a)\n- Trivial codegen addition\n\n**Step 12: Integration tests**\n- Parser unit tests for each new feature\n- Codegen unit tests for each new feature\n- E2E tests for: untyped VAL, array literals, multi-line expressions, intrinsics\n- Full course module verification: transpile + `go vet`\n\n### Testing Strategy\n\n#### Unit Tests\n\nAdd to `parser/parser_test.go`:\n- `TestParseUntypedValAbbreviation` - `VAL x IS 42 :`\n- `TestParseUntypedValHex` - `VAL mask IS #FF :`\n- `TestParseArrayLiteral` - `[1, 2, 3]` in expression context\n- `TestParseArrayLiteralSingleElement` - `[42]` (must not confuse with array decl)\n- `TestParseRetypesInt` - `VAL INT X RETYPES X :`\n- `TestParseRetypesArrayInt` - `VAL [2]INT X RETYPES X :`\n- `TestParseMultiLineExpression` - multi-line AND/OR continuation\n\nAdd to `codegen/codegen_test.go`:\n- `TestGenUntypedValAbbreviation` - verifies `:=` output\n- `TestGenArrayLiteral` - verifies `[]int{...}` output\n- `TestGenRetypesReal32` - verifies `math.Float32bits` output\n- `TestGenRetypesReal64` - verifies `math.Float64bits` output\n- `TestGenIntrinsicLongprod` - verifies `_LONGPROD` call\n- `TestGenCauseerror` - verifies `panic(\"CAUSEERROR\")` output\n\n#### E2E Tests\n\nAdd to `codegen/e2e_types_test.go` or a new `codegen/e2e_float_io_test.go`:\n- `TestE2E_UntypedVal` - untyped VAL used in computation\n- `TestE2E_ArrayLiteral` - array literal indexed and printed\n- `TestE2E_MultiLineExpr` - multi-line AND/OR expression evaluated\n- `TestE2E_LongProd` - call _LONGPROD with known values\n- `TestE2E_LongDiv` - call _LONGDIV with known values\n- `TestE2E_Normalise` - call _NORMALISE with known values\n- `TestE2E_ShiftLeftRight` - call _SHIFTLEFT/_SHIFTRIGHT with known values\n\n#### Integration Verification\n\n```bash\n# Build\ngo build -o occam2go .\n\n# Transpile full course module\n./occam2go -I kroc/modules/course/libsrc -D TARGET.BITS.PER.WORD=32 \\\n    -o /tmp/course_out.go kroc/modules/course/libsrc/course.module\n\n# Verify Go output compiles (expect only \"no main function\" since it's a library)\ngo vet /tmp/course_out.go\n\n# Run all tests\ngo test ./...\n```\n\n---\n\n### Risks and Mitigation\n\n1. **Multi-line expression DEDENT tracking**: The `parseBinaryExpr` DEDENT consumption assumes the continuation DEDENT is the first DEDENT after the RHS expression. If the RHS expression itself contains block constructs that produce DEDENTs, this could consume the wrong DEDENT. **Mitigation**: In float_io.occ, all multi-line expression continuations have simple parenthesized RHS expressions (no block constructs). Test thoroughly with the actual file. If needed, a more robust approach would save and check `indentLevel` before/after.\n\n2. **Array literal type inference**: Using `[]int{}` for all array literals. If any array literal contains non-integer values, this would fail. **Mitigation**: All array literals in float_io.occ contain hex integers (INT type). For future generality, could infer type from the abbreviation context.\n\n3. **RETYPES naming collision**: When `VAL INT X RETYPES X :` creates a new X shadowing the parameter X, Go's `:=` creates a new scope variable. Subsequent code using X sees the INT version. **Mitigation**: This is correct Go shadowing behavior. Go allows `x := int(...)` even when x is already declared as float32 in the parameter list.\n\n4. **Intrinsic 32-bit arithmetic**: The helper functions use `uint32` casts to match transputer 32-bit word semantics. This differs from Go's native 64-bit int. **Mitigation**: The float_io.occ code was written for 32-bit transputers. The `uint32` truncation in helpers ensures identical behavior. Test with known values from the transputer documentation.\n\n5. **`needMathBits` import**: Adding `\"math/bits\"` import requires it to be used. If the intrinsic helpers are emitted but no intrinsic is actually called (e.g., preprocessor excluded them), the unused import causes a Go compile error. **Mitigation**: Only emit helpers when `containsIntrinsics()` returns true for actual FuncCall nodes in the AST.\n\n---\n\n### Critical Files for Implementation\n\n- `/home/david/projects/code-associates/occam2go/parser/parser.go` - Main parser: untyped VAL, array literals, RETYPES, multi-line continuation (4 of 6 features)\n- `/home/david/projects/code-associates/occam2go/codegen/codegen.go` - Code generator: array literal gen, RETYPES gen, intrinsic helpers, CAUSEERROR, untyped VAL package-level\n- `/home/david/projects/code-associates/occam2go/ast/ast.go` - AST node definitions: ArrayLiteral, RetypesDecl\n- `/home/david/projects/code-associates/occam2go/lexer/lexer.go` - Bracket NEWLINE suppression (2 lines)\n- `/home/david/projects/code-associates/occam2go/lexer/token.go` - RETYPES keyword token"
  },
  {
    "type": "text",
    "text": "agentId: a0f898a (for resuming to continue this agent's work if needed)\n<usage>total_tokens: 129654\ntool_uses: 92\nduration_ms: 2778036</usage>"
  }
]

File created successfully at: /home/david/.claude/plans/curious-honking-whisper.md