ReplaceSource.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
var Source = require("./Source");
var SourceNode = require("source-map").SourceNode;
var SourceListMap = require("source-list-map").SourceListMap;
var fromStringWithSourceMap = require("source-list-map").fromStringWithSourceMap;
var SourceMapConsumer = require("source-map").SourceMapConsumer;
function ReplaceSource(source, name) {
Source.call(this);
this._source = source;
this._name = name;
this.replacements = [];
}
module.exports = ReplaceSource;
ReplaceSource.prototype = Object.create(Source.prototype);
ReplaceSource.prototype.constructor = ReplaceSource;
ReplaceSource.prototype.replace = function(start, end, newValue) {
if(typeof newValue !== "string")
throw new Error("insertion must be a string, but is a " + typeof newValue);
this.replacements.push([start, end, newValue, this.replacements.length]);
};
ReplaceSource.prototype.insert = function(pos, newValue) {
if(typeof newValue !== "string")
throw new Error("insertion must be a string, but is a " + typeof newValue + ": " + newValue);
this.replacements.push([pos, pos - 1, newValue, this.replacements.length]);
};
ReplaceSource.prototype.source = function(options) {
return this._replaceString(this._source.source());
};
ReplaceSource.prototype._sortReplacements = function() {
this.replacements.sort(function(a, b) {
var diff = b[1] - a[1];
if(diff !== 0)
return diff;
diff = b[0] - a[0];
if(diff !== 0)
return diff;
return b[3] - a[3];
});
};
ReplaceSource.prototype._replaceString = function(str) {
if(typeof str !== "string")
throw new Error("str must be a string, but is a " + typeof str + ": " + str);
this._sortReplacements();
var result = [str];
this.replacements.forEach(function(repl) {
var remSource = result.pop();
var splitted1 = this._splitString(remSource, Math.floor(repl[1] + 1));
var splitted2 = this._splitString(splitted1[0], Math.floor(repl[0]));
result.push(splitted1[1], repl[2], splitted2[0]);
}, this);
result = result.reverse();
return result.join("");
};
require("./SourceAndMapMixin")(ReplaceSource.prototype);
ReplaceSource.prototype.node = function(options) {
this._sortReplacements();
var result = [this._source.node(options)];
this.replacements.forEach(function(repl) {
var remSource = result.pop();
var splitted1 = this._splitSourceNode(remSource, Math.floor(repl[1] + 1));
var splitted2;
if(Array.isArray(splitted1)) {
splitted2 = this._splitSourceNode(splitted1[0], Math.floor(repl[0]));
if(Array.isArray(splitted2)) {
result.push(splitted1[1], this._replacementToSourceNode(splitted2[1], repl[2]), splitted2[0]);
} else {
result.push(splitted1[1], this._replacementToSourceNode(splitted1[1], repl[2]), splitted1[0]);
}
} else {
splitted2 = this._splitSourceNode(remSource, Math.floor(repl[0]));
if(Array.isArray(splitted2)) {
result.push(this._replacementToSourceNode(splitted2[1], repl[2]), splitted2[0]);
} else {
result.push(repl[2], remSource);
}
}
}, this);
result = result.reverse();
return new SourceNode(null, null, null, result);
};
ReplaceSource.prototype.listMap = function(options) {
var map = this._source.listMap(options);
if(map.children.length !== 1) {
var code = map.toString();
code = this._replaceString(code).split("\n");
var currentIndex = 0;
map.mapGeneratedCode(function(str) {
var idx = -1;
var count = -1;
do {
count++;
idx = str.indexOf("\n", idx + 1);
} while (idx >= 0);
if(!count) return "";
var result = code.slice(currentIndex, currentIndex + count).join("\n") + "\n";
currentIndex += count;
return result;
});
map.add(code.slice(currentIndex).join("\n"));
} else {
map.mapGeneratedCode(this._replaceString.bind(this));
}
return map;
};
ReplaceSource.prototype._replacementToSourceNode = function(oldNode, newString) {
var map = oldNode.toStringWithSourceMap({
file: "?"
}).map;
var original = new SourceMapConsumer(map.toJSON()).originalPositionFor({
line: 1,
column: 0
});
if(original) {
return new SourceNode(original.line, original.column, original.source, newString);
} else {
return newString;
}
};
ReplaceSource.prototype._splitSourceNode = function(node, position) {
if(typeof node === "string") {
if(node.length <= position) return position - node.length;
return position <= 0 ? ["", node] : [node.substr(0, position), node.substr(position)];
} else {
for(var i = 0; i < node.children.length; i++) {
position = this._splitSourceNode(node.children[i], position);
if(Array.isArray(position)) {
var leftNode = new SourceNode(
node.line,
node.column,
node.source,
node.children.slice(0, i).concat([position[0]]),
node.name
);
var rightNode = new SourceNode(
node.line,
node.column,
node.source, [position[1]].concat(node.children.slice(i + 1)),
node.name
);
leftNode.sourceContents = node.sourceContents;
return [leftNode, rightNode];
}
}
return position;
}
};
ReplaceSource.prototype._splitString = function(str, position) {
return position <= 0 ? ["", str] : [str.substr(0, position), str.substr(position)];
};