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Copy pathansiToSvg.ts
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272 lines (238 loc) · 8.02 KB
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/**
* Converts ANSI-escaped terminal text to SVG format
* Supports basic ANSI color codes (foreground colors)
*/
import { escapeXml } from './xml.js'
export type AnsiColor = {
r: number
g: number
b: number
}
// Default terminal color palette (similar to most terminals)
const ANSI_COLORS: Record<number, AnsiColor> = {
30: { r: 0, g: 0, b: 0 }, // black
31: { r: 205, g: 49, b: 49 }, // red
32: { r: 13, g: 188, b: 121 }, // green
33: { r: 229, g: 229, b: 16 }, // yellow
34: { r: 36, g: 114, b: 200 }, // blue
35: { r: 188, g: 63, b: 188 }, // magenta
36: { r: 17, g: 168, b: 205 }, // cyan
37: { r: 229, g: 229, b: 229 }, // white
// Bright colors
90: { r: 102, g: 102, b: 102 }, // bright black (gray)
91: { r: 241, g: 76, b: 76 }, // bright red
92: { r: 35, g: 209, b: 139 }, // bright green
93: { r: 245, g: 245, b: 67 }, // bright yellow
94: { r: 59, g: 142, b: 234 }, // bright blue
95: { r: 214, g: 112, b: 214 }, // bright magenta
96: { r: 41, g: 184, b: 219 }, // bright cyan
97: { r: 255, g: 255, b: 255 }, // bright white
}
export const DEFAULT_FG: AnsiColor = { r: 229, g: 229, b: 229 } // light gray
export const DEFAULT_BG: AnsiColor = { r: 30, g: 30, b: 30 } // dark gray
export type TextSpan = {
text: string
color: AnsiColor
bold: boolean
}
export type ParsedLine = TextSpan[]
/**
* Parse ANSI escape sequences from text
* Supports:
* - Basic colors (30-37, 90-97)
* - 256-color mode (38;5;n)
* - 24-bit true color (38;2;r;g;b)
*/
export function parseAnsi(text: string): ParsedLine[] {
const lines: ParsedLine[] = []
const rawLines = text.split('\n')
for (const line of rawLines) {
const spans: TextSpan[] = []
let currentColor = DEFAULT_FG
let bold = false
let i = 0
while (i < line.length) {
// Check for ANSI escape sequence
if (line[i] === '\x1b' && line[i + 1] === '[') {
// Find the end of the escape sequence
let j = i + 2
while (j < line.length && !/[A-Za-z]/.test(line[j]!)) {
j++
}
if (line[j] === 'm') {
// Color/style code
const codes = line
.slice(i + 2, j)
.split(';')
.map(Number)
let k = 0
while (k < codes.length) {
const code = codes[k]!
if (code === 0) {
// Reset
currentColor = DEFAULT_FG
bold = false
} else if (code === 1) {
bold = true
} else if (code >= 30 && code <= 37) {
currentColor = ANSI_COLORS[code] || DEFAULT_FG
} else if (code >= 90 && code <= 97) {
currentColor = ANSI_COLORS[code] || DEFAULT_FG
} else if (code === 39) {
currentColor = DEFAULT_FG
} else if (code === 38) {
// Extended color - check next code
if (codes[k + 1] === 5 && codes[k + 2] !== undefined) {
// 256-color mode: 38;5;n
const colorIndex = codes[k + 2]!
currentColor = get256Color(colorIndex)
k += 2
} else if (
codes[k + 1] === 2 &&
codes[k + 2] !== undefined &&
codes[k + 3] !== undefined &&
codes[k + 4] !== undefined
) {
// 24-bit true color: 38;2;r;g;b
currentColor = {
r: codes[k + 2]!,
g: codes[k + 3]!,
b: codes[k + 4]!,
}
k += 4
}
}
k++
}
}
i = j + 1
continue
}
// Regular character - find extent of same-styled text
const textStart = i
while (i < line.length && line[i] !== '\x1b') {
i++
}
const spanText = line.slice(textStart, i)
if (spanText) {
spans.push({ text: spanText, color: currentColor, bold })
}
}
// Add empty span if line is empty (to preserve line)
if (spans.length === 0) {
spans.push({ text: '', color: DEFAULT_FG, bold: false })
}
lines.push(spans)
}
return lines
}
/**
* Get color from 256-color palette
*/
function get256Color(index: number): AnsiColor {
// Standard colors (0-15)
if (index < 16) {
const standardColors: AnsiColor[] = [
{ r: 0, g: 0, b: 0 }, // 0 black
{ r: 128, g: 0, b: 0 }, // 1 red
{ r: 0, g: 128, b: 0 }, // 2 green
{ r: 128, g: 128, b: 0 }, // 3 yellow
{ r: 0, g: 0, b: 128 }, // 4 blue
{ r: 128, g: 0, b: 128 }, // 5 magenta
{ r: 0, g: 128, b: 128 }, // 6 cyan
{ r: 192, g: 192, b: 192 }, // 7 white
{ r: 128, g: 128, b: 128 }, // 8 bright black
{ r: 255, g: 0, b: 0 }, // 9 bright red
{ r: 0, g: 255, b: 0 }, // 10 bright green
{ r: 255, g: 255, b: 0 }, // 11 bright yellow
{ r: 0, g: 0, b: 255 }, // 12 bright blue
{ r: 255, g: 0, b: 255 }, // 13 bright magenta
{ r: 0, g: 255, b: 255 }, // 14 bright cyan
{ r: 255, g: 255, b: 255 }, // 15 bright white
]
return standardColors[index] || DEFAULT_FG
}
// 216 color cube (16-231)
if (index < 232) {
const i = index - 16
const r = Math.floor(i / 36)
const g = Math.floor((i % 36) / 6)
const b = i % 6
return {
r: r === 0 ? 0 : 55 + r * 40,
g: g === 0 ? 0 : 55 + g * 40,
b: b === 0 ? 0 : 55 + b * 40,
}
}
// Grayscale (232-255)
const gray = (index - 232) * 10 + 8
return { r: gray, g: gray, b: gray }
}
export type AnsiToSvgOptions = {
fontFamily?: string
fontSize?: number
lineHeight?: number
paddingX?: number
paddingY?: number
backgroundColor?: string
borderRadius?: number
}
/**
* Convert ANSI text to SVG
* Uses <tspan> elements within a single <text> per line so the renderer
* handles character spacing natively (no manual charWidth calculation)
*/
export function ansiToSvg(
ansiText: string,
options: AnsiToSvgOptions = {},
): string {
const {
fontFamily = 'Menlo, Monaco, monospace',
fontSize = 14,
lineHeight = 22,
paddingX = 24,
paddingY = 24,
backgroundColor = `rgb(${DEFAULT_BG.r}, ${DEFAULT_BG.g}, ${DEFAULT_BG.b})`,
borderRadius = 8,
} = options
const lines = parseAnsi(ansiText)
// Trim trailing empty lines
while (
lines.length > 0 &&
lines[lines.length - 1]!.every(span => span.text.trim() === '')
) {
lines.pop()
}
// Estimate width based on max line length (for SVG dimensions only)
// For monospace fonts, character width is roughly 0.6 * fontSize
const charWidthEstimate = fontSize * 0.6
const maxLineLength = Math.max(
...lines.map(spans => spans.reduce((acc, s) => acc + s.text.length, 0)),
)
const width = Math.ceil(maxLineLength * charWidthEstimate + paddingX * 2)
const height = lines.length * lineHeight + paddingY * 2
// Build SVG - use tspan elements so renderer handles character positioning
let svg = `<svg xmlns="http://www.w3.org/2000/svg" width="${width}" height="${height}" viewBox="0 0 ${width} ${height}">\n`
svg += ` <rect width="100%" height="100%" fill="${backgroundColor}" rx="${borderRadius}" ry="${borderRadius}"/>\n`
svg += ` <style>\n`
svg += ` text { font-family: ${fontFamily}; font-size: ${fontSize}px; white-space: pre; }\n`
svg += ` .b { font-weight: bold; }\n`
svg += ` </style>\n`
for (let lineIndex = 0; lineIndex < lines.length; lineIndex++) {
const spans = lines[lineIndex]!
const y =
paddingY + (lineIndex + 1) * lineHeight - (lineHeight - fontSize) / 2
// Build a single <text> element with <tspan> children for each colored segment
// xml:space="preserve" prevents SVG from collapsing whitespace
svg += ` <text x="${paddingX}" y="${y}" xml:space="preserve">`
for (const span of spans) {
if (!span.text) continue
const colorStr = `rgb(${span.color.r}, ${span.color.g}, ${span.color.b})`
const boldClass = span.bold ? ' class="b"' : ''
svg += `<tspan fill="${colorStr}"${boldClass}>${escapeXml(span.text)}</tspan>`
}
svg += `</text>\n`
}
svg += `</svg>`
return svg
}