40 lines
949 B
JavaScript
40 lines
949 B
JavaScript
/* @flow */
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import { lineBreakG } from "./whitespace";
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// These are used when `options.locations` is on, for the
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// `startLoc` and `endLoc` properties.
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export class Position {
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constructor(line, col) {
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this.line = line;
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this.column = col;
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}
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}
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export class SourceLocation {
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constructor(start, end) {
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this.start = start;
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this.end = end;
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}
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}
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// The `getLineInfo` function is mostly useful when the
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// `locations` option is off (for performance reasons) and you
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// want to find the line/column position for a given character
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// offset. `input` should be the code string that the offset refers
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// into.
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export function getLineInfo(input, offset) {
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for (let line = 1, cur = 0; ;) {
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lineBreakG.lastIndex = cur;
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let match = lineBreakG.exec(input);
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if (match && match.index < offset) {
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++line;
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cur = match.index + match[0].length;
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} else {
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return new Position(line, offset - cur);
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}
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}
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}
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