Lezer#1889
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…M6 demo A Lezer grammar (generated from pyret-grammar.bnf, then hand-tuned for the few spots Pyret leans on GLR) that matches the canonical RNGLR parser exactly on accept/reject, tree structure, and final ast.arr across the repo corpus (553 files), bootstrapworld starter-files (182), and ~9.7k fuzz mutants -- at ~5x the speed and ~5-9x smaller. Architecture: an external tokenizer replays Pyret's own tokenizer into Lezer, so token-level disambiguation is inherited and only the grammar (CFG) is in scope. Includes the oracle/measure/compare-trees/ast-equiv/fuzz harness, a to-rnglr adapter that reshapes the Lezer tree so the existing translate() is reused unchanged, and a standalone CodeMirror 6 editor demo (cm6-demo/) with Pyret highlighting, folding, and CPO-style Tab/reindent. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
surface-parse-lezer lives inside parse-pyret.js and reuses its in-closure translate() + tokenizer, fed by the lezer-pyret bundle through a to-rnglr adapter (no separate builtin needed). Threaded through CompileOptions, the CLI flag def, the compile-lib pyret-string seam, and the file/npm locators' get-module -- the latter being the real per-file parse point for file-based runs. Default parser unchanged. Verified byte-identical program output and parse-error messages with and without the flag; tests/parse/parse.js 60 specs, 0 failures. Note: the bundle path in require-node-compile-dependencies.js is currently an absolute machine path -- make configurable before sharing. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
The locators' get-module routes parsing through the Lezer frontend when the URL has ?parser=lezer, inside a try/catch that falls back to the built-in parser on any error. cpo-config.json registers the browser bundle (relative path) as a raw-js module; CPO compiles parse-pyret from lang via the pyret->../lang symlink, so surface-parse-lezer flows in automatically. Default (built-in) parser unchanged. Verified: make web-local builds clean and the bundle's lezerParseToRnglr yields ast.arr byte-identical to the RNGLR oracle. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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