97 lines
2.6 KiB
JavaScript
97 lines
2.6 KiB
JavaScript
'use strict';
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const sourceMapGenerator_js = require('source-map-js/lib/source-map-generator.js');
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const trackNodes = new Set(['Atrule', 'Selector', 'Declaration']);
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function generateSourceMap(handlers) {
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const map = new sourceMapGenerator_js.SourceMapGenerator();
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const generated = {
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line: 1,
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column: 0
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};
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const original = {
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line: 0, // should be zero to add first mapping
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column: 0
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};
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const activatedGenerated = {
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line: 1,
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column: 0
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};
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const activatedMapping = {
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generated: activatedGenerated
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};
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let line = 1;
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let column = 0;
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let sourceMappingActive = false;
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const origHandlersNode = handlers.node;
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handlers.node = function(node) {
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if (node.loc && node.loc.start && trackNodes.has(node.type)) {
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const nodeLine = node.loc.start.line;
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const nodeColumn = node.loc.start.column - 1;
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if (original.line !== nodeLine ||
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original.column !== nodeColumn) {
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original.line = nodeLine;
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original.column = nodeColumn;
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generated.line = line;
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generated.column = column;
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if (sourceMappingActive) {
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sourceMappingActive = false;
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if (generated.line !== activatedGenerated.line ||
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generated.column !== activatedGenerated.column) {
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map.addMapping(activatedMapping);
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}
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}
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sourceMappingActive = true;
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map.addMapping({
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source: node.loc.source,
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original,
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generated
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});
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}
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}
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origHandlersNode.call(this, node);
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if (sourceMappingActive && trackNodes.has(node.type)) {
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activatedGenerated.line = line;
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activatedGenerated.column = column;
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}
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};
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const origHandlersEmit = handlers.emit;
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handlers.emit = function(value, type, auto) {
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for (let i = 0; i < value.length; i++) {
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if (value.charCodeAt(i) === 10) { // \n
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line++;
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column = 0;
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} else {
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column++;
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}
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}
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origHandlersEmit(value, type, auto);
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};
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const origHandlersResult = handlers.result;
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handlers.result = function() {
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if (sourceMappingActive) {
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map.addMapping(activatedMapping);
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}
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return {
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css: origHandlersResult(),
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map
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};
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};
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return handlers;
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}
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exports.generateSourceMap = generateSourceMap;
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