source: trip-planner-front/node_modules/webpack-sources/lib/applySourceMap.js@ bdd6491

Last change on this file since bdd6491 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

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1/*
2 MIT License http://www.opensource.org/licenses/mit-license.php
3 Author Tobias Koppers @sokra
4*/
5
6"use strict";
7
8var SourceNode = require("source-map").SourceNode;
9var SourceMapConsumer = require("source-map").SourceMapConsumer;
10
11var applySourceMap = function(
12 sourceNode,
13 sourceMapConsumer,
14 sourceFile,
15 removeGeneratedCodeForSourceFile
16) {
17 // The following notations are used to name stuff:
18 // Left <------------> Middle <-------------------> Right
19 // Input arguments:
20 // sourceNode - Code mapping from Left to Middle
21 // sourceFile - Name of a Middle file
22 // sourceMapConsumer - Code mapping from Middle to Right
23 // Variables:
24 // l2m m2r
25 // Left <-----------------------------------------> Right
26 // Variables:
27 // l2r
28
29 var l2rResult = new SourceNode();
30 var l2rOutput = [];
31
32 var middleSourceContents = {};
33
34 var m2rMappingsByLine = {};
35
36 var rightSourceContentsSet = {};
37 var rightSourceContentsLines = {};
38
39 // Store all mappings by generated line
40 sourceMapConsumer.eachMapping(
41 function(mapping) {
42 (m2rMappingsByLine[mapping.generatedLine] =
43 m2rMappingsByLine[mapping.generatedLine] || []).push(mapping);
44 },
45 null,
46 SourceMapConsumer.GENERATED_ORDER
47 );
48
49 // Store all source contents
50 sourceNode.walkSourceContents(function(source, content) {
51 middleSourceContents["$" + source] = content;
52 });
53
54 var middleSource = middleSourceContents["$" + sourceFile];
55 var middleSourceLines = middleSource ? middleSource.split("\n") : undefined;
56
57 // Walk all left to middle mappings
58 sourceNode.walk(function(chunk, middleMapping) {
59 var source;
60
61 // Find a mapping from middle to right
62 if(
63 middleMapping.source === sourceFile &&
64 middleMapping.line &&
65 m2rMappingsByLine[middleMapping.line]
66 ) {
67 var m2rBestFit;
68 var m2rMappings = m2rMappingsByLine[middleMapping.line];
69 // Note: if this becomes a performance problem, use binary search
70 for(var i = 0; i < m2rMappings.length; i++) {
71 if(m2rMappings[i].generatedColumn <= middleMapping.column) {
72 m2rBestFit = m2rMappings[i];
73 }
74 }
75 if(m2rBestFit) {
76 var allowMiddleName = false;
77 var middleLine;
78 var rightSourceContent;
79 var rightSourceContentLines;
80 var rightSource = m2rBestFit.source;
81 // Check if we have middle and right source for this mapping
82 // Then we could have an "identify" mapping
83 if(
84 middleSourceLines &&
85 rightSource &&
86 (middleLine = middleSourceLines[m2rBestFit.generatedLine - 1]) &&
87 ((rightSourceContentLines = rightSourceContentsLines[rightSource]) ||
88 (rightSourceContent = sourceMapConsumer.sourceContentFor(
89 rightSource,
90 true
91 )))
92 ) {
93 if(!rightSourceContentLines) {
94 rightSourceContentLines = rightSourceContentsLines[
95 rightSource
96 ] = rightSourceContent.split("\n");
97 }
98 var rightLine = rightSourceContentLines[m2rBestFit.originalLine - 1];
99 if(rightLine) {
100 var offset = middleMapping.column - m2rBestFit.generatedColumn;
101 if(offset > 0) {
102 var middlePart = middleLine.slice(
103 m2rBestFit.generatedColumn,
104 middleMapping.column
105 );
106 var rightPart = rightLine.slice(
107 m2rBestFit.originalColumn,
108 m2rBestFit.originalColumn + offset
109 );
110 if(middlePart === rightPart) {
111 // When original and generated code is equal we assume we have an "identity" mapping
112 // In this case we can offset the original position
113 m2rBestFit = Object.assign({}, m2rBestFit, {
114 originalColumn: m2rBestFit.originalColumn + offset,
115 generatedColumn: middleMapping.column
116 });
117 }
118 }
119 if(!m2rBestFit.name && middleMapping.name) {
120 allowMiddleName =
121 rightLine.slice(
122 m2rBestFit.originalColumn,
123 m2rBestFit.originalColumn + middleMapping.name.length
124 ) === middleMapping.name;
125 }
126 }
127 }
128
129 // Construct a left to right node from the found middle to right mapping
130 source = m2rBestFit.source;
131 l2rOutput.push(
132 new SourceNode(
133 m2rBestFit.originalLine,
134 m2rBestFit.originalColumn,
135 source,
136 chunk,
137 allowMiddleName ? middleMapping.name : m2rBestFit.name
138 )
139 );
140
141 // Set the source contents once
142 if(!("$" + source in rightSourceContentsSet)) {
143 rightSourceContentsSet["$" + source] = true;
144 var sourceContent = sourceMapConsumer.sourceContentFor(source, true);
145 if(sourceContent) {
146 l2rResult.setSourceContent(source, sourceContent);
147 }
148 }
149 return;
150 }
151 }
152
153 if((removeGeneratedCodeForSourceFile && middleMapping.source === sourceFile) || !middleMapping.source) {
154 // Construct a left to middle node with only generated code
155 // Because user do not want mappings to middle sources
156 // Or this chunk has no mapping
157 l2rOutput.push(chunk);
158 return;
159 }
160
161 // Construct a left to middle node
162 source = middleMapping.source;
163 l2rOutput.push(
164 new SourceNode(
165 middleMapping.line,
166 middleMapping.column,
167 source,
168 chunk,
169 middleMapping.name
170 )
171 );
172 if("$" + source in middleSourceContents) {
173 if(!("$" + source in rightSourceContentsSet)) {
174 l2rResult.setSourceContent(source, middleSourceContents["$" + source]);
175 delete middleSourceContents["$" + source];
176 }
177 }
178 });
179
180 // Put output into the resulting SourceNode
181 l2rResult.add(l2rOutput);
182 return l2rResult;
183};
184
185module.exports = applySourceMap;
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