[Copilot]

chromacon can locate escape sequences but not say what they do, so consumers rendering coloured output outside a terminal (HTML log panels, SVG, reports) each write their own SGR interpreter. This adds a parser that resolves SGR codes into styled runs, plus supporting helpers.

parseAnsiStyles("\x1b[1;31mFAIL\x1b[22m still red\x1b[0m plain");
// [
//   { text: "FAIL",       style: { bold: true, fg: { type: "basic", index: 1 } } },
//   { text: " still red", style: { fg: { type: "basic", index: 1 } } },
//   { text: " plain",     style: {} }
// ]

• parseAnsiStyles(value, state?) (ansi/parseAnsiStyles.ts)
  • Resolves the SGR attributes and resets listed in the issue (bold, dim, italic, underline/double, blink, inverse, hidden, strikethrough, overline, fg/bg/underline colour).
  • Reads multi-parameter sequences, and extended colours in both semicolon and colon (ITU) forms.
  • 38;5;n with n < 16 is reported as basic. Malformed or out-of-range colours are ignored.
  • Handles the 8-bit CSI \x9b, drops non-SGR sequences, and exposes OSC 8 as style.link.
  • Merges adjacent runs with the same style and omits empty runs.
  • state is cloned, not mutated.
  • createAnsiStyleParser() is a stateful push(chunk) / state() wrapper for line-at-a-time input.
• Colour helpers (ansi/ansiColors.ts): ansi256ToRgb (xterm 6×6×6 cube and greyscale ramp, with an overridable 0–15 palette), ansiColorToCss, and DEFAULT_ANSI_PALETTE.
• getSgrName(code) (ansi/sgrCodes.ts) gives a runtime lookup of SGR code names. CSIColors stays a const enum. The names are newly chosen (e.g. fgRed, bgBrightBlue), so reviewers may want to weigh in on them.
• ansiToHtml(value, options?) (ansi/ansiToHtml.ts) is a separate module for tree-shaking.
  • HTML-escapes text.
  • Emits class-based (ansi- prefix by default) or inline-style spans.
  • Emits OSC 8 links as <a rel="noopener noreferrer">. Links can be disabled, and javascript:, data: and vbscript: URLs are never emitted as links.
• All new symbols are exported from index.ts. The implementation avoids object spread and adds no new dependencies, to stay ES5-friendly.
• Tests in test/src/ansi/parseAnsiStyles.test.ts cover the issue's test table plus the helpers, getSgrName, the stateful parser and ansiToHtml.

Not done:

• No CHANGELIST.md entry.
• The repo's own build, lint and test targets were not run, because core has no installed dependencies in this environment.

• Fixes [Feature] Add a parser that resolves ANSI SGR codes into styled text runs #278

[codecov]

Codecov Report

❌ Patch coverage is 8.12183% with 181 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.92%. Comparing base (4559e38) to head (fe13c1c).

Files with missing lines	Patch %	Lines
core/src/ansi/parseAnsiStyles.ts	4.95%	115 Missing ⚠️
core/src/ansi/ansiToHtml.ts	7.69%	36 Missing ⚠️
core/src/ansi/ansiColors.ts	19.04%	17 Missing ⚠️
core/src/ansi/sgrCodes.ts	18.75%	13 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (4559e38) and HEAD (fe13c1c). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (4559e38)	HEAD (fe13c1c)
	4	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #279       +/-   ##
===========================================
- Coverage   89.86%   49.92%   -39.94%     
===========================================
  Files          23       27        +4     
  Lines         513      709      +196     
  Branches      138      213       +75     
===========================================
- Hits          461      354      -107     
- Misses         52      355      +303     

Files with missing lines	Coverage Δ
core/src/ansi/sgrCodes.ts	18.75% <18.75%> (ø)
core/src/ansi/ansiColors.ts	19.04% <19.04%> (ø)
core/src/ansi/ansiToHtml.ts	7.69% <7.69%> (ø)
core/src/ansi/parseAnsiStyles.ts	4.95% <4.95%> (ø)

... and 12 files with indirect coverage changes

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[nev21]

@copilot, you should be using the ts-utils helpers for ALL of these

[nev21]

Taking over and implementing a fuller solution