45 lines
1.3 KiB
JavaScript
45 lines
1.3 KiB
JavaScript
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"use strict";
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exports.__esModule = true;
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exports.SourceLocation = exports.Position = undefined;
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exports.getLineInfo = getLineInfo;
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var _whitespace = require("./whitespace");
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function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
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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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var Position = exports.Position = function Position(line, col) {
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_classCallCheck(this, Position);
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this.line = line;
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this.column = col;
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};
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var SourceLocation = exports.SourceLocation = function SourceLocation(start, end) {
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_classCallCheck(this, SourceLocation);
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this.start = start;
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this.end = end;
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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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function getLineInfo(input, offset) {
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for (var line = 1, cur = 0;;) {
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_whitespace.lineBreakG.lastIndex = cur;
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var match = _whitespace.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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