79 lines
2.0 KiB
JavaScript
79 lines
2.0 KiB
JavaScript
'use strict';
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var SourceMapGenerator = require('source-map').SourceMapGenerator;
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var trackNodes = {
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Atrule: true,
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Selector: true,
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Declaration: true
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};
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module.exports = function generateSourceMap(generator, ast) {
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var map = new SourceMapGenerator();
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var generated = {
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line: 1,
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column: 0
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};
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var 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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var sourceMappingActive = false;
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var activatedGenerated = {
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line: 1,
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column: 0
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};
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var activatedMapping = {
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generated: activatedGenerated
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};
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var css = generator(ast, function(node, buffer, line, column) {
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if (!node.loc ||
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!node.loc.start ||
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!trackNodes.hasOwnProperty(node.type)) {
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return;
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}
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var nodeLine = node.loc.start.line;
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var 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: original,
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generated: generated
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});
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}
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}, function(node, buffer, line, column) {
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if (sourceMappingActive && trackNodes.hasOwnProperty(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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if (sourceMappingActive) {
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map.addMapping(activatedMapping);
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}
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return {
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css: css,
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map: map
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};
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};
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