Files
ai-agent-deep-dive/extracted-source/node_modules/@alcalzone/ansi-tokenize/build/reduce.js

38 lines
1.7 KiB
JavaScript

import ansiStyles from "ansi-styles";
import { endCodesSet } from "./ansiCodes.js";
/** Reduces the given array of ANSI codes to the minimum necessary to render with the same style */
export function reduceAnsiCodes(codes) {
return reduceAnsiCodesIncremental([], codes);
}
/** Like {@link reduceAnsiCodes}, but assumes that `codes` is already reduced. Further reductions are only done for the items in `newCodes`. */
export function reduceAnsiCodesIncremental(codes, newCodes) {
let ret = [...codes];
for (const code of newCodes) {
if (code.code === ansiStyles.reset.open) {
// Reset code, disable all codes
ret = [];
}
else if (endCodesSet.has(code.code)) {
// This is an end code, disable all matching start codes
ret = ret.filter((retCode) => retCode.endCode !== code.code);
}
else {
// This is a start code. Remove codes it "overrides", then add it.
// If a new code has the same endCode, it "overrides" existing ones.
// Special case: Intensity codes (1m, 2m) can coexist (both end with 22m).
const isIntensityCode = code.code === ansiStyles.bold.open || code.code === ansiStyles.dim.open;
// Add intensity codes only if not already present
if (isIntensityCode) {
if (!ret.find((retCode) => retCode.code === code.code && retCode.endCode === code.endCode)) {
ret.push(code);
}
}
else {
ret = ret.filter((retCode) => retCode.endCode !== code.endCode);
ret.push(code);
}
}
}
return ret;
}
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