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// Splits terminal text into runs styled by SGR escape sequences, keeping the
// style and any sequence cut off at a chunk boundary for the next chunk.
// Handles reset, bold and the 16 foreground colors; drops other sequences.
const names = ['Black', 'Red', 'Green', 'Yellow', 'Blue', 'Magenta', 'Cyan', 'White'];
const sequence = /\x1b\[([0-?]*)[ -/]*([@-~])/g;
const unfinished = /\x1b(\[[0-?]*[ -/]*)?$/;
export function createAnsiParser() {
let bold = false;
let color = null;
let rest = '';
return text => {
text = rest + text;
const cut = text.match(unfinished);
rest = cut ? cut[0] : '';
if (cut) text = text.slice(0, cut.index);
const runs = [];
let start = 0;
for (const match of text.matchAll(sequence)) {
if (match.index > start) runs.push({ text: text.slice(start, match.index), bold, color });
start = match.index + match[0].length;
if (match[2] !== 'm') continue;
for (const parameter of match[1].split(';')) {
const code = Number(parameter || 0);
if (code === 0) { bold = false; color = null; }
else if (code === 1) bold = true;
else if (code === 22) bold = false;
else if (code === 39) color = null;
else if (code >= 30 && code <= 37) color = `terminal.ansi${names[code - 30]}`;
else if (code >= 90 && code <= 97) color = `terminal.ansiBright${names[code - 90]}`;
}
}
if (start < text.length) runs.push({ text: text.slice(start), bold, color });
return runs;
};
}
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