59 lines
1.4 KiB
JavaScript
59 lines
1.4 KiB
JavaScript
var SourceMapConsumer = require('source-map').SourceMapConsumer;
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function inputSourceMapTracker() {
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var maps = {};
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return {
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all: all.bind(null, maps),
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isTracking: isTracking.bind(null, maps),
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originalPositionFor: originalPositionFor.bind(null, maps),
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track: track.bind(null, maps)
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};
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}
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function all(maps) {
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return maps;
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}
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function isTracking(maps, source) {
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return source in maps;
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}
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function originalPositionFor(maps, metadata, range, selectorFallbacks) {
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var line = metadata[0];
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var column = metadata[1];
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var source = metadata[2];
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var position = {
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line: line,
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column: column + range
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};
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var originalPosition;
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while (!originalPosition && position.column > column) {
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position.column--;
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originalPosition = maps[source].originalPositionFor(position);
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}
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if (!originalPosition || originalPosition.column < 0) {
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return metadata;
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}
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if (originalPosition.line === null && line > 1 && selectorFallbacks > 0) {
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return originalPositionFor(maps, [line - 1, column, source], range, selectorFallbacks - 1);
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}
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return originalPosition.line !== null
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? toMetadata(originalPosition)
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: metadata;
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}
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function toMetadata(asHash) {
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return [asHash.line, asHash.column, asHash.source];
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}
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function track(maps, source, data) {
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maps[source] = new SourceMapConsumer(data);
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}
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module.exports = inputSourceMapTracker;
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