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tcl: expr mini-language — recursive descent parser (+20 tests, 127 total)
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Replaces 3-token flat evaluator with full recursive descent parser:
operator precedence, parentheses, unary ops, ** power, function calls
(abs/sqrt/pow/max/min/int/double), expression tokenizer for dense syntax.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
giles
2026-05-06 08:43:02 +00:00
parent 72ccaf4565
commit ac013c9381
3 changed files with 443 additions and 37 deletions
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plans/tcl-on-sx.md
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@@ -69,7 +69,7 @@ Core mapping:
### Phase 2 — sequential eval + core commands
- [x] `tcl-eval-script`: walk command list, dispatch each first-word into command table
- [x] Core commands: `set`, `unset`, `incr`, `append`, `lappend`, `puts`, `gets`, `expr`, `if`, `while`, `for`, `foreach`, `switch`, `break`, `continue`, `return`, `error`, `eval`, `subst`, `format`, `scan`
- [ ] `expr` is its own mini-language — operator precedence, function calls (`sin`, `sqrt`, `pow`, `abs`, `int`, `double`), variable substitution, command substitution
- [x] `expr` is its own mini-language — operator precedence, function calls (`sin`, `sqrt`, `pow`, `abs`, `int`, `double`), variable substitution, command substitution
- [ ] String commands: `string length`, `string index`, `string range`, `string compare`, `string match`, `string toupper`, `string tolower`, `string trim`, `string map`, `string repeat`, `string first`, `string last`, `string is`, `string cat`
- [ ] List commands: `list`, `lindex`, `lrange`, `llength`, `lreverse`, `lsearch`, `lsort`, `lsort -integer/-real/-dictionary`, `lreplace`, `linsert`, `concat`, `split`, `join`
- [ ] Dict commands: `dict create`, `dict get`, `dict set`, `dict unset`, `dict exists`, `dict keys`, `dict values`, `dict size`, `dict for`, `dict update`, `dict merge`
@@ -120,6 +120,7 @@ Core mapping:
_Newest first._
- 2026-05-06: Phase 2 expr mini-language — recursive descent parser, operator precedence, parens, unary ops, pow/sqrt/abs/max/min/int/double, 127 tests green (67 parse + 60 eval)
- 2026-04-26: Phase 2 core commands — if/while/for/foreach/switch/break/continue/return/error/unset/lappend/eval/expr + :code control flow, 107 tests green (67 parse + 40 eval)
- 2026-04-26: Phase 2 eval engine — `lib/tcl/runtime.sx`, tcl-eval-script + set/puts/incr/append, 87 tests green (67 parse + 20 eval)
- 2026-04-25: Phase 1 parser — `lib/tcl/parser.sx`, word-simple?/word-literal helpers, 67 tests green, commit 6ee05259