init claude-code

ink/termio/sgr.ts

@@ -0,0 +1,308 @@
+/**
+ * SGR (Select Graphic Rendition) Parser
+ *
+ * Parses SGR parameters and applies them to a TextStyle.
+ * Handles both semicolon (;) and colon (:) separated parameters.
+ */
+
+import type { NamedColor, TextStyle, UnderlineStyle } from './types.js'
+import { defaultStyle } from './types.js'
+
+const NAMED_COLORS: NamedColor[] = [
+  'black',
+  'red',
+  'green',
+  'yellow',
+  'blue',
+  'magenta',
+  'cyan',
+  'white',
+  'brightBlack',
+  'brightRed',
+  'brightGreen',
+  'brightYellow',
+  'brightBlue',
+  'brightMagenta',
+  'brightCyan',
+  'brightWhite',
+]
+
+const UNDERLINE_STYLES: UnderlineStyle[] = [
+  'none',
+  'single',
+  'double',
+  'curly',
+  'dotted',
+  'dashed',
+]
+
+type Param = { value: number | null; subparams: number[]; colon: boolean }
+
+function parseParams(str: string): Param[] {
+  if (str === '') return [{ value: 0, subparams: [], colon: false }]
+
+  const result: Param[] = []
+  let current: Param = { value: null, subparams: [], colon: false }
+  let num = ''
+  let inSub = false
+
+  for (let i = 0; i <= str.length; i++) {
+    const c = str[i]
+    if (c === ';' || c === undefined) {
+      const n = num === '' ? null : parseInt(num, 10)
+      if (inSub) {
+        if (n !== null) current.subparams.push(n)
+      } else {
+        current.value = n
+      }
+      result.push(current)
+      current = { value: null, subparams: [], colon: false }
+      num = ''
+      inSub = false
+    } else if (c === ':') {
+      const n = num === '' ? null : parseInt(num, 10)
+      if (!inSub) {
+        current.value = n
+        current.colon = true
+        inSub = true
+      } else {
+        if (n !== null) current.subparams.push(n)
+      }
+      num = ''
+    } else if (c >= '0' && c <= '9') {
+      num += c
+    }
+  }
+  return result
+}
+
+function parseExtendedColor(
+  params: Param[],
+  idx: number,
+): { r: number; g: number; b: number } | { index: number } | null {
+  const p = params[idx]
+  if (!p) return null
+
+  if (p.colon && p.subparams.length >= 1) {
+    if (p.subparams[0] === 5 && p.subparams.length >= 2) {
+      return { index: p.subparams[1]! }
+    }
+    if (p.subparams[0] === 2 && p.subparams.length >= 4) {
+      const off = p.subparams.length >= 5 ? 1 : 0
+      return {
+        r: p.subparams[1 + off]!,
+        g: p.subparams[2 + off]!,
+        b: p.subparams[3 + off]!,
+      }
+    }
+  }
+
+  const next = params[idx + 1]
+  if (!next) return null
+  if (
+    next.value === 5 &&
+    params[idx + 2]?.value !== null &&
+    params[idx + 2]?.value !== undefined
+  ) {
+    return { index: params[idx + 2]!.value! }
+  }
+  if (next.value === 2) {
+    const r = params[idx + 2]?.value
+    const g = params[idx + 3]?.value
+    const b = params[idx + 4]?.value
+    if (
+      r !== null &&
+      r !== undefined &&
+      g !== null &&
+      g !== undefined &&
+      b !== null &&
+      b !== undefined
+    ) {
+      return { r, g, b }
+    }
+  }
+  return null
+}
+
+export function applySGR(paramStr: string, style: TextStyle): TextStyle {
+  const params = parseParams(paramStr)
+  let s = { ...style }
+  let i = 0
+
+  while (i < params.length) {
+    const p = params[i]!
+    const code = p.value ?? 0
+
+    if (code === 0) {
+      s = defaultStyle()
+      i++
+      continue
+    }
+    if (code === 1) {
+      s.bold = true
+      i++
+      continue
+    }
+    if (code === 2) {
+      s.dim = true
+      i++
+      continue
+    }
+    if (code === 3) {
+      s.italic = true
+      i++
+      continue
+    }
+    if (code === 4) {
+      s.underline = p.colon
+        ? (UNDERLINE_STYLES[p.subparams[0]!] ?? 'single')
+        : 'single'
+      i++
+      continue
+    }
+    if (code === 5 || code === 6) {
+      s.blink = true
+      i++
+      continue
+    }
+    if (code === 7) {
+      s.inverse = true
+      i++
+      continue
+    }
+    if (code === 8) {
+      s.hidden = true
+      i++
+      continue
+    }
+    if (code === 9) {
+      s.strikethrough = true
+      i++
+      continue
+    }
+    if (code === 21) {
+      s.underline = 'double'
+      i++
+      continue
+    }
+    if (code === 22) {
+      s.bold = false
+      s.dim = false
+      i++
+      continue
+    }
+    if (code === 23) {
+      s.italic = false
+      i++
+      continue
+    }
+    if (code === 24) {
+      s.underline = 'none'
+      i++
+      continue
+    }
+    if (code === 25) {
+      s.blink = false
+      i++
+      continue
+    }
+    if (code === 27) {
+      s.inverse = false
+      i++
+      continue
+    }
+    if (code === 28) {
+      s.hidden = false
+      i++
+      continue
+    }
+    if (code === 29) {
+      s.strikethrough = false
+      i++
+      continue
+    }
+    if (code === 53) {
+      s.overline = true
+      i++
+      continue
+    }
+    if (code === 55) {
+      s.overline = false
+      i++
+      continue
+    }
+
+    if (code >= 30 && code <= 37) {
+      s.fg = { type: 'named', name: NAMED_COLORS[code - 30]! }
+      i++
+      continue
+    }
+    if (code === 39) {
+      s.fg = { type: 'default' }
+      i++
+      continue
+    }
+    if (code >= 40 && code <= 47) {
+      s.bg = { type: 'named', name: NAMED_COLORS[code - 40]! }
+      i++
+      continue
+    }
+    if (code === 49) {
+      s.bg = { type: 'default' }
+      i++
+      continue
+    }
+    if (code >= 90 && code <= 97) {
+      s.fg = { type: 'named', name: NAMED_COLORS[code - 90 + 8]! }
+      i++
+      continue
+    }
+    if (code >= 100 && code <= 107) {
+      s.bg = { type: 'named', name: NAMED_COLORS[code - 100 + 8]! }
+      i++
+      continue
+    }
+
+    if (code === 38) {
+      const c = parseExtendedColor(params, i)
+      if (c) {
+        s.fg =
+          'index' in c
+            ? { type: 'indexed', index: c.index }
+            : { type: 'rgb', ...c }
+        i += p.colon ? 1 : 'index' in c ? 3 : 5
+        continue
+      }
+    }
+    if (code === 48) {
+      const c = parseExtendedColor(params, i)
+      if (c) {
+        s.bg =
+          'index' in c
+            ? { type: 'indexed', index: c.index }
+            : { type: 'rgb', ...c }
+        i += p.colon ? 1 : 'index' in c ? 3 : 5
+        continue
+      }
+    }
+    if (code === 58) {
+      const c = parseExtendedColor(params, i)
+      if (c) {
+        s.underlineColor =
+          'index' in c
+            ? { type: 'indexed', index: c.index }
+            : { type: 'rgb', ...c }
+        i += p.colon ? 1 : 'index' in c ? 3 : 5
+        continue
+      }
+    }
+    if (code === 59) {
+      s.underlineColor = { type: 'default' }
+      i++
+      continue
+    }
+
+    i++
+  }
+  return s
+}