Template.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const Tapable = require("tapable");
const ConcatSource = require("webpack-sources").ConcatSource;
const START_LOWERCASE_ALPHABET_CODE = "a".charCodeAt(0);
const START_UPPERCASE_ALPHABET_CODE = "A".charCodeAt(0);
const DELTA_A_TO_Z = "z".charCodeAt(0) - START_LOWERCASE_ALPHABET_CODE + 1;
module.exports = class Template extends Tapable {
constructor(outputOptions) {
super();
this.outputOptions = outputOptions || {};
}
static getFunctionContent(fn) {
return fn.toString().replace(/^function\s?\(\)\s?\{\n?|\n?\}$/g, "").replace(/^\t/mg, "");
}
static toIdentifier(str) {
if(typeof str !== "string") return "";
return str.replace(/^[^a-zA-Z$_]/, "_").replace(/[^a-zA-Z0-9$_]/g, "_");
}
// map number to a single character a-z, A-Z or <_ + number> if number is too big
static numberToIdentifer(n) {
// lower case
if(n < DELTA_A_TO_Z) return String.fromCharCode(START_LOWERCASE_ALPHABET_CODE + n);
// upper case
n -= DELTA_A_TO_Z;
if(n < DELTA_A_TO_Z) return String.fromCharCode(START_UPPERCASE_ALPHABET_CODE + n);
// fall back to _ + number
n -= DELTA_A_TO_Z;
return "_" + n;
}
indent(str) {
if(Array.isArray(str)) {
return str.map(this.indent.bind(this)).join("\n");
} else {
str = str.trimRight();
if(!str) return "";
var ind = (str[0] === "\n" ? "" : "\t");
return ind + str.replace(/\n([^\n])/g, "\n\t$1");
}
}
prefix(str, prefix) {
if(Array.isArray(str)) {
str = str.join("\n");
}
str = str.trim();
if(!str) return "";
let ind = (str[0] === "\n" ? "" : prefix);
return ind + str.replace(/\n([^\n])/g, "\n" + prefix + "$1");
}
asString(str) {
if(Array.isArray(str)) {
return str.join("\n");
}
return str;
}
getModulesArrayBounds(modules) {
if(!modules.every(moduleIdIsNumber))
return false;
var maxId = -Infinity;
var minId = Infinity;
modules.forEach(function(module) {
if(maxId < module.id) maxId = module.id;
if(minId > module.id) minId = module.id;
});
if(minId < 16 + ("" + minId).length) {
// add minId x ',' instead of 'Array(minId).concat(...)'
minId = 0;
}
var objectOverhead = modules.map(function(module) {
var idLength = (module.id + "").length;
return idLength + 2;
}).reduce(function(a, b) {
return a + b;
}, -1);
var arrayOverhead = minId === 0 ? maxId : 16 + ("" + minId).length + maxId;
return arrayOverhead < objectOverhead ? [minId, maxId] : false;
}
renderChunkModules(chunk, moduleTemplate, dependencyTemplates, prefix) {
if(!prefix) prefix = "";
var source = new ConcatSource();
if(chunk.modules.length === 0) {
source.add("[]");
return source;
}
var removedModules = chunk.removedModules;
var allModules = chunk.modules.map(function(module) {
return {
id: module.id,
source: moduleTemplate.render(module, dependencyTemplates, chunk)
};
});
if(removedModules && removedModules.length > 0) {
removedModules.forEach(function(id) {
allModules.push({
id: id,
source: "false"
});
});
}
var bounds = this.getModulesArrayBounds(chunk.modules);
if(bounds) {
// Render a spare array
var minId = bounds[0];
var maxId = bounds[1];
if(minId !== 0) source.add("Array(" + minId + ").concat(");
source.add("[\n");
var modules = {};
allModules.forEach(function(module) {
modules[module.id] = module;
});
for(var idx = minId; idx <= maxId; idx++) {
var module = modules[idx];
if(idx !== minId) source.add(",\n");
source.add("/* " + idx + " */");
if(module) {
source.add("\n");
source.add(module.source);
}
}
source.add("\n" + prefix + "]");
if(minId !== 0) source.add(")");
} else {
// Render an object
source.add("{\n");
allModules.sort(function(a, b) {
var aId = a.id + "";
var bId = b.id + "";
if(aId < bId) return -1;
if(aId > bId) return 1;
return 0;
}).forEach(function(module, idx) {
if(idx !== 0) source.add(",\n");
source.add("\n/***/ " + JSON.stringify(module.id) + ":\n");
source.add(module.source);
});
source.add("\n\n" + prefix + "}");
}
return source;
}
};
function moduleIdIsNumber(module) {
return typeof module.id === "number";
}