青岛推送

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3 天以前 9bce51f651aad297ef9eb6df832bfdaf1de05d84

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/*
    MIT License http://www.opensource.org/licenses/mit-license.php
    Author Alexander Akait @alexander-akait
*/
 
"use strict";
 
const RuntimeGlobals = require("../RuntimeGlobals");
const RuntimeModule = require("../RuntimeModule");
const Template = require("../Template");
 
/** @typedef {import("../Compilation")} Compilation */
 
class ToBinaryRuntimeModule extends RuntimeModule {
    constructor() {
        super("to binary");
    }
 
    /**
     * Generates runtime code for this runtime module.
     * @returns {string | null} runtime code
     */
    generate() {
        const compilation = /** @type {Compilation} */ (this.compilation);
        const fn = RuntimeGlobals.toBinary;
        const { runtimeTemplate } = compilation;
 
        // Inspired by esbuild
 
        const isNodePlatform = compilation.compiler.platform.node;
        const isWebPlatform = compilation.compiler.platform.web;
        const isNeutralPlatform = runtimeTemplate.isNeutralPlatform();
        const toImmutableBytes = runtimeTemplate.basicFunction("value", [
            runtimeTemplate.destructureObject(["buffer"], "value"),
            `${runtimeTemplate.renderConst()} throwErr = ${runtimeTemplate.basicFunction("", ["throw new TypeError('ArrayBuffer is immutable');"])};`,
            "Object.defineProperties(buffer, { immutable: { value: true },  resize: { value: throwErr }, transfer: { value: throwErr }, transferToFixedLength: { value: throwErr } });",
            "Object.freeze(buffer);",
            "return value;"
        ]);
 
        return Template.asString([
            "// define to binary helper",
            `${runtimeTemplate.renderConst()} toImmutableBytes = ${toImmutableBytes}`,
            `${fn} = ${isNeutralPlatform ? "typeof Buffer !== 'undefined' ? " : ""}${
                isNodePlatform || isNeutralPlatform
                    ? `${runtimeTemplate.returningFunction("toImmutableBytes(new Uint8Array(Buffer.from(base64, 'base64')))", "base64")}`
                    : ""
            } ${isNeutralPlatform ? ": " : ""}${
                isWebPlatform || isNeutralPlatform
                    ? `(${runtimeTemplate.basicFunction("", [
                            `${runtimeTemplate.renderConst()} table = new Uint8Array(128);`,
                            "for (var i = 0; i < 64; i++) table[i < 26 ? i + 65 : i < 52 ? i + 71 : i < 62 ? i - 4 : i * 4 - 205] = i;",
                            `return ${runtimeTemplate.basicFunction("base64", [
                                `${runtimeTemplate.renderConst()} n = base64.length, bytes = new Uint8Array((n - (base64[n - 1] == '=') - (base64[n - 2] == '=')) * 3 / 4 | 0);`,
                                "for (var i = 0, j = 0; i < n;) {",
                                Template.indent([
                                    `${runtimeTemplate.renderConst()} c0 = table[base64.charCodeAt(i++)], c1 = table[base64.charCodeAt(i++)];`,
                                    `${runtimeTemplate.renderConst()} c2 = table[base64.charCodeAt(i++)], c3 = table[base64.charCodeAt(i++)];`,
                                    "bytes[j++] = (c0 << 2) | (c1 >> 4);",
                                    "bytes[j++] = (c1 << 4) | (c2 >> 2);",
                                    "bytes[j++] = (c2 << 6) | c3;"
                                ]),
                                "}",
                                "return toImmutableBytes(bytes)"
                            ])}`
                        ])})();`
                    : ""
            }`
        ]);
    }
}
 
module.exports = ToBinaryRuntimeModule;