v1.5.0

What's Changed

• chore: new version 1.4.0 by @theodevelop in #20
• fix/issues-21-22-23 by @theodevelop in #24
• chore: github files by @theodevelop in #25
• fix: resolve issues #21 #22 #23 — mid-rule actions, %token alias, flex SC blocks by @theodevelop in #26

Full Changelog: v1.4.0...v1.5.0

What's Changed

• chore: new version 1.4.0 by @theodevelop in #20
• fix/issues-21-22-23 by @theodevelop in #24
• chore: github files by @theodevelop in #25
• fix: resolve issues #21 #22 #23 — mid-rule actions, %token alias, flex SC blocks by @theodevelop in #26

Full Changelog: v1.4.0...v1.5.0

v1.4.1

Bug fixes

#21 — Mid-rule action blocks counted as $N symbols (Bison)

Action blocks { } embedded in the middle of a production are now counted as grammar symbols in Bison's $N numbering. Previously they were silently stripped, causing false-positive bison/out-of-bounds errors and missed real out-of-bounds accesses.

#22 — %token NAME NUMBER "alias" parsing (Bison)

%token declarations with both a numeric value and a string alias are now parsed in the correct order. Previously, words inside the alias string were misidentified as token names, generating spurious bison/undeclared-token and bison/unused-token diagnostics.

#23 — <SC>{ } block syntax (Flex)

Rules grouped inside a <SC1,SC2>{ ... } block now correctly inherit their start conditions. Previously the block header was misidentified as a rule pattern, generating false flex/unreachable-rule and flex/unused-sc diagnostics.

Assets

• bison-flex-language-support-1.4.1.vsix — install manually via Extensions: Install from VSIX…
• Available on VS Code Marketplace and Open VSX

What's Changed

• chore: new version 1.4.0 by @theodevelop in #20
• fix/issues-21-22-23 by @theodevelop in #24
• chore: github files by @theodevelop in #25
• fix: resolve issues #21 #22 #23 — mid-rule actions, %token alias, flex SC blocks by @theodevelop in #26

Full Changelog: v1.4.0...v1.4.1

v1.4.0

What's new in 1.4.0

✨ Fix-it hints (22 quick fixes)

Lightbulb / Ctrl+. on any diagnostic now offers an automatic correction for the majority of Bison and Flex errors and warnings:

• Bison: insert %%, declare %token, insert %empty, remove unused token/rule/directive, add rule stub, add %type <todo>, remove invalid %start, add %start, close %{ block, and 4 yacc-compat replacements (%error-verbose, %name-prefix, %pure-parser, %binary)
• Flex: insert %%, define abbreviation stub, remove unused abbreviation/start condition/directive, declare %x SC_NAME, remove unused %option, remove duplicate <<EOF>>, add %option noyywrap, close %{ block, remove inaccessible rule

✨ Version-gated diagnostics

Three new settings to match your target toolchain:

• bisonFlex.minVersionBison — e.g. "2.3" suppresses checks requiring Bison 3.x
• bisonFlex.minVersionFlex — same for Flex
• bisonFlex.disabledChecks — e.g. ["bison/shift-reduce", "flex/missing-yywrap"]

✨ Diagnostic codes & links

Every diagnostic now shows a clickable code (e.g. bison/unused-token) that opens the relevant GNU documentation page directly in your browser.

✨ Greyed-out unused symbols

Unused tokens, rules, start conditions, and abbreviations are now visually faded in the editor (DiagnosticTag.Unnecessary).

🐛 Fixed

• Unused token grey underline started mid-token instead of at the first character (column offset bug in parseTokenNames)

⚙️ CI

• Pipeline now runs on dev branch as well as main
• VSIX artifact uploaded on every CI run (30-day retention)

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Full changelog: CHANGELOG.md

v1.1.3

What's changed

Fixed

• Bison — comments in rules: Tokens inside /* */ block comments (including multi-line) and // line comments are no longer falsely reported as undeclared
• Bison — token names: Token names containing lowercase letters or digits (e.g. STANDARD_202x) are now correctly parsed — previously the regex stopped at the first non-uppercase character, producing false positives
• Bison — identifiers in action blocks: Identifiers inside { } action blocks are no longer scanned for undeclared tokens

Full changelog: v1.1.2...v1.1.3

What's Changed

• fix: support lowercase and digits in token names by @theodevelop in #12
• fix: ignore comments and action blocks when parsing rule symbols by @theodevelop in #13
• fix: token parsing robustness — lowercase names and comment stripping by @theodevelop in #14

Full Changelog: v1.1.2...v1.1.3

v1.1.2

What's Changed

• fix: count literals when checking $n bounds (closes #4) by @theodevelop in #11

Full Changelog: v1.1.1...v1.1.2

v1.1.1

What's Changed

• v1.1.1 by @theodevelop in #3

Full Changelog: v1.1.0...v1.1.1

v1.1.0

[1.1.0] - 2026-03-18

Added

• Document Symbols — Outline view (Ctrl+Shift+O) with collapsible sections for declarations, rules, and epilogue (Bison) or definitions, rules, and user code (Flex)
• Workspace Symbols — Fuzzy symbol search (Ctrl+T) across all open Bison and Flex files (up to 200 results)
• Code Lens — "N reference(s)" above each Bison rule and Flex start condition; "⬪ entry point" badge above the start symbol
• Inlay Hints — Inline type annotations for $$, $1, $2, etc. derived from %type/%token declarations
• CMake Integration
  • Diagnostic warning when a .y/.l file is not referenced in a nearby BISON_TARGET/FLEX_TARGET
  • New command Bison/Flex: Add CMake Target — appends the correct BISON_TARGET or FLEX_TARGET snippet to CMakeLists.txt
• Compile Commands
  • Bison: Compile — runs bison -d on the current file and surfaces errors as VS Code diagnostics
  • Flex: Compile — runs flex on the current file and surfaces errors as VS Code diagnostics
• Grammar Tools
  • Bison: Show Parse Table — renders the .output parse table in a side panel
  • Bison: Show Grammar Graph — interactive D3.js force-directed graph; click a node to navigate to the rule; detects left/right recursion
  • Bison: Explain Conflict — detailed shift/reduce conflict analysis with fix suggestions and precedence recommendations
  • Bison: Generate AST Skeleton — generates a complete C++ AST with visitor pattern, forward declarations, and node classes
  • Flex: Test Rule — interactive regex tester for the pattern on the current line
• Initialize tasks.json — auto-generates .vscode/tasks.json with Bison/Flex problem matchers; auto-detects CMake and Makefile projects
• Yacc Legacy Hints — inlay hints for legacy %pure_parser, %union, and YYSTYPE patterns pointing to modern Bison equivalents
• Smart Indent — onEnterRules for Bison and Flex that indent correctly after rule openers and %{/%}

Changed

• README updated with all new features, configuration settings, and screenshots
• Status bar shows a "Grammar Graph" shortcut button when a Bison file is active

Configuration

Three new settings:

Setting	Default	Description
bisonFlex.showInlayHints	true	Show inlay hints for $$/$1/@$ semantic values
bisonFlex.enableCodeLens	true	Show Code Lens reference counts and entry-point badges
bisonFlex.enableCmakeDiagnostics	true	Warn when a .y/.l file is missing from CMakeLists.txt

What's Changed

• Add grammar tools, CMake integration & UI enhancements by @theodevelop in #2

Full Changelog: v1.0.0...v1.1.0

v1.0.0

What's Changed

• Version 1.0.0 by @theodevelop in #1

New Contributors

• @theodevelop made their first contribution in #1

Full Changelog: https://github.com/theodevelop/bison-flex-lang/commits/v1.0.0