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SourceNode.js
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Sat, Nov 9, 11:25

SourceNode.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const base64VLQ = require("./base64-vlq");
const getNumberOfLines = require("./helpers").getNumberOfLines;
const getUnfinishedLine = require("./helpers").getUnfinishedLine;
const LINE_MAPPING = ";AACA";
class SourceNode {
constructor(generatedCode, source, originalSource, startingLine) {
this.generatedCode = generatedCode;
this.originalSource = originalSource;
this.source = source;
this.startingLine = startingLine || 1;
this._numberOfLines = getNumberOfLines(this.generatedCode);
this._endsWithNewLine = generatedCode[generatedCode.length - 1] === "\n";
}
clone() {
return new SourceNode(this.generatedCode, this.source, this.originalSource, this.startingLine);
}
getGeneratedCode() {
return this.generatedCode;
}
addGeneratedCode(code) {
this.generatedCode += code;
this._numberOfLines += getNumberOfLines(code);
this._endsWithNewLine = code[code.length - 1] === "\n";
}
getMappings(mappingsContext) {
if(!this.generatedCode)
return "";
const lines = this._numberOfLines;
const sourceIdx = mappingsContext.ensureSource(this.source, this.originalSource);
let mappings = "A"; // generated column 0
if(mappingsContext.unfinishedGeneratedLine)
mappings = "," + base64VLQ.encode(mappingsContext.unfinishedGeneratedLine);
mappings += base64VLQ.encode(sourceIdx - mappingsContext.currentSource); // source index
mappings += base64VLQ.encode(this.startingLine - mappingsContext.currentOriginalLine); // original line index
mappings += "A"; // original column 0
mappingsContext.currentSource = sourceIdx;
mappingsContext.currentOriginalLine = this.startingLine + lines - 1;
const unfinishedGeneratedLine = mappingsContext.unfinishedGeneratedLine = getUnfinishedLine(this.generatedCode)
mappings += Array(lines).join(LINE_MAPPING);
if(unfinishedGeneratedLine === 0) {
mappings += ";";
} else {
if(lines !== 0) {
mappings += LINE_MAPPING;
}
mappingsContext.currentOriginalLine++;
}
return mappings;
}
mapGeneratedCode(fn) {
throw new Error("Cannot map generated code on a SourceMap. Normalize to SingleLineNode first.");
}
getNormalizedNodes() {
var results = [];
var currentLine = this.startingLine;
var generatedCode = this.generatedCode;
var index = 0;
var indexEnd = generatedCode.length;
while(index < indexEnd) {
// get one generated line
var nextLine = generatedCode.indexOf("\n", index) + 1;
if(nextLine === 0) nextLine = indexEnd;
var lineGenerated = generatedCode.substr(index, nextLine - index);
results.push(new SingleLineNode(lineGenerated, this.source, this.originalSource, currentLine));
// move cursors
index = nextLine;
currentLine++;
}
return results;
}
merge(otherNode) {
if(otherNode instanceof SourceNode) {
return this.mergeSourceNode(otherNode);
} else if(otherNode instanceof SingleLineNode) {
return this.mergeSingleLineNode(otherNode);
}
return false;
}
mergeSourceNode(otherNode) {
if(this.source === otherNode.source &&
this._endsWithNewLine &&
this.startingLine + this._numberOfLines === otherNode.startingLine) {
this.generatedCode += otherNode.generatedCode;
this._numberOfLines += otherNode._numberOfLines;
this._endsWithNewLine = otherNode._endsWithNewLine;
return this;
}
return false;
}
mergeSingleLineNode(otherNode) {
if(this.source === otherNode.source &&
this._endsWithNewLine &&
this.startingLine + this._numberOfLines === otherNode.line &&
otherNode._numberOfLines <= 1) {
this.addSingleLineNode(otherNode);
return this;
}
return false;
}
addSingleLineNode(otherNode) {
this.generatedCode += otherNode.generatedCode;
this._numberOfLines += otherNode._numberOfLines
this._endsWithNewLine = otherNode._endsWithNewLine;
}
}
module.exports = SourceNode;
const SingleLineNode = require("./SingleLineNode"); // circular dependency

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