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TemplatedPathPlugin.js
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Sun, Feb 16, 08:27

TemplatedPathPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Jason Anderson @diurnalist
*/
"use strict";
const { basename, extname } = require("path");
const util = require("util");
const Chunk = require("./Chunk");
const Module = require("./Module");
const { parseResource } = require("./util/identifier");
/** @typedef {import("./Compilation").AssetInfo} AssetInfo */
/** @typedef {import("./Compilation").PathData} PathData */
/** @typedef {import("./Compiler")} Compiler */
const REGEXP = /\[\\*([\w:]+)\\*\]/gi;
const prepareId = id => {
if (typeof id !== "string") return id;
if (/^"\s\+*.*\+\s*"$/.test(id)) {
const match = /^"\s\+*\s*(.*)\s*\+\s*"$/.exec(id);
return `" + (${match[1]} + "").replace(/(^[.-]|[^a-zA-Z0-9_-])+/g, "_") + "`;
}
return id.replace(/(^[.-]|[^a-zA-Z0-9_-])+/g, "_");
};
const hashLength = (replacer, handler, assetInfo, hashName) => {
const fn = (match, arg, input) => {
let result;
const length = arg && parseInt(arg, 10);
if (length && handler) {
result = handler(length);
} else {
const hash = replacer(match, arg, input);
result = length ? hash.slice(0, length) : hash;
}
if (assetInfo) {
assetInfo.immutable = true;
if (Array.isArray(assetInfo[hashName])) {
assetInfo[hashName] = [...assetInfo[hashName], result];
} else if (assetInfo[hashName]) {
assetInfo[hashName] = [assetInfo[hashName], result];
} else {
assetInfo[hashName] = result;
}
}
return result;
};
return fn;
};
const replacer = (value, allowEmpty) => {
const fn = (match, arg, input) => {
if (typeof value === "function") {
value = value();
}
if (value === null || value === undefined) {
if (!allowEmpty) {
throw new Error(
`Path variable ${match} not implemented in this context: ${input}`
);
}
return "";
} else {
return `${value}`;
}
};
return fn;
};
const deprecationCache = new Map();
const deprecatedFunction = (() => () => {})();
const deprecated = (fn, message, code) => {
let d = deprecationCache.get(message);
if (d === undefined) {
d = util.deprecate(deprecatedFunction, message, code);
deprecationCache.set(message, d);
}
return (...args) => {
d();
return fn(...args);
};
};
/**
* @param {string | function(PathData, AssetInfo=): string} path the raw path
* @param {PathData} data context data
* @param {AssetInfo} assetInfo extra info about the asset (will be written to)
* @returns {string} the interpolated path
*/
const replacePathVariables = (path, data, assetInfo) => {
const chunkGraph = data.chunkGraph;
/** @type {Map<string, Function>} */
const replacements = new Map();
// Filename context
//
// Placeholders
//
// for /some/path/file.js?query#fragment:
// [file] - /some/path/file.js
// [query] - ?query
// [fragment] - #fragment
// [base] - file.js
// [path] - /some/path/
// [name] - file
// [ext] - .js
if (data.filename) {
if (typeof data.filename === "string") {
const { path: file, query, fragment } = parseResource(data.filename);
const ext = extname(file);
const base = basename(file);
const name = base.slice(0, base.length - ext.length);
const path = file.slice(0, file.length - base.length);
replacements.set("file", replacer(file));
replacements.set("query", replacer(query, true));
replacements.set("fragment", replacer(fragment, true));
replacements.set("path", replacer(path, true));
replacements.set("base", replacer(base));
replacements.set("name", replacer(name));
replacements.set("ext", replacer(ext, true));
// Legacy
replacements.set(
"filebase",
deprecated(
replacer(base),
"[filebase] is now [base]",
"DEP_WEBPACK_TEMPLATE_PATH_PLUGIN_REPLACE_PATH_VARIABLES_FILENAME"
)
);
}
}
// Compilation context
//
// Placeholders
//
// [fullhash] - data.hash (3a4b5c6e7f)
//
// Legacy Placeholders
//
// [hash] - data.hash (3a4b5c6e7f)
if (data.hash) {
const hashReplacer = hashLength(
replacer(data.hash),
data.hashWithLength,
assetInfo,
"fullhash"
);
replacements.set("fullhash", hashReplacer);
// Legacy
replacements.set(
"hash",
deprecated(
hashReplacer,
"[hash] is now [fullhash] (also consider using [chunkhash] or [contenthash], see documentation for details)",
"DEP_WEBPACK_TEMPLATE_PATH_PLUGIN_REPLACE_PATH_VARIABLES_HASH"
)
);
}
// Chunk Context
//
// Placeholders
//
// [id] - chunk.id (0.js)
// [name] - chunk.name (app.js)
// [chunkhash] - chunk.hash (7823t4t4.js)
// [contenthash] - chunk.contentHash[type] (3256u3zg.js)
if (data.chunk) {
const chunk = data.chunk;
const contentHashType = data.contentHashType;
const idReplacer = replacer(chunk.id);
const nameReplacer = replacer(chunk.name || chunk.id);
const chunkhashReplacer = hashLength(
replacer(chunk instanceof Chunk ? chunk.renderedHash : chunk.hash),
"hashWithLength" in chunk ? chunk.hashWithLength : undefined,
assetInfo,
"chunkhash"
);
const contenthashReplacer = hashLength(
replacer(
data.contentHash ||
(contentHashType &&
chunk.contentHash &&
chunk.contentHash[contentHashType])
),
data.contentHashWithLength ||
("contentHashWithLength" in chunk && chunk.contentHashWithLength
? chunk.contentHashWithLength[contentHashType]
: undefined),
assetInfo,
"contenthash"
);
replacements.set("id", idReplacer);
replacements.set("name", nameReplacer);
replacements.set("chunkhash", chunkhashReplacer);
replacements.set("contenthash", contenthashReplacer);
}
// Module Context
//
// Placeholders
//
// [id] - module.id (2.png)
// [hash] - module.hash (6237543873.png)
//
// Legacy Placeholders
//
// [moduleid] - module.id (2.png)
// [modulehash] - module.hash (6237543873.png)
if (data.module) {
const module = data.module;
const idReplacer = replacer(() =>
prepareId(
module instanceof Module ? chunkGraph.getModuleId(module) : module.id
)
);
const moduleHashReplacer = hashLength(
replacer(() =>
module instanceof Module
? chunkGraph.getRenderedModuleHash(module, data.runtime)
: module.hash
),
"hashWithLength" in module ? module.hashWithLength : undefined,
assetInfo,
"modulehash"
);
const contentHashReplacer = hashLength(
replacer(data.contentHash),
undefined,
assetInfo,
"contenthash"
);
replacements.set("id", idReplacer);
replacements.set("modulehash", moduleHashReplacer);
replacements.set("contenthash", contentHashReplacer);
replacements.set(
"hash",
data.contentHash ? contentHashReplacer : moduleHashReplacer
);
// Legacy
replacements.set(
"moduleid",
deprecated(
idReplacer,
"[moduleid] is now [id]",
"DEP_WEBPACK_TEMPLATE_PATH_PLUGIN_REPLACE_PATH_VARIABLES_MODULE_ID"
)
);
}
// Other things
if (data.url) {
replacements.set("url", replacer(data.url));
}
if (typeof data.runtime === "string") {
replacements.set(
"runtime",
replacer(() => prepareId(data.runtime))
);
} else {
replacements.set("runtime", replacer("_"));
}
if (typeof path === "function") {
path = path(data, assetInfo);
}
path = path.replace(REGEXP, (match, content) => {
if (content.length + 2 === match.length) {
const contentMatch = /^(\w+)(?::(\w+))?$/.exec(content);
if (!contentMatch) return match;
const [, kind, arg] = contentMatch;
const replacer = replacements.get(kind);
if (replacer !== undefined) {
return replacer(match, arg, path);
}
} else if (match.startsWith("[\\") && match.endsWith("\\]")) {
return `[${match.slice(2, -2)}]`;
}
return match;
});
return path;
};
const plugin = "TemplatedPathPlugin";
class TemplatedPathPlugin {
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
compiler.hooks.compilation.tap(plugin, compilation => {
compilation.hooks.assetPath.tap(plugin, replacePathVariables);
});
}
}
module.exports = TemplatedPathPlugin;

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