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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const { DEFAULTS } = require("./config/defaults");
const { getOrInsert } = require("./util/MapHelpers");
const { first } = require("./util/SetHelpers");
const createHash = require("./util/createHash");
const { RuntimeSpecMap, runtimeToString } = require("./util/runtime");
/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("./Module")} Module */
/** @typedef {import("./Module").SourceType} SourceType */
/** @typedef {import("./Module").CodeGenerationResult} CodeGenerationResult */
/** @typedef {import("./Module").CodeGenerationResultData} CodeGenerationResultData */
/** @typedef {import("./Module").ReadOnlyRuntimeRequirements} ReadOnlyRuntimeRequirements */
/** @typedef {import("./util/Hash").HashFunction} HashFunction */
/** @typedef {import("./util/runtime").RuntimeSpec} RuntimeSpec */
/**
* Stores code generation results keyed by module and runtime so later stages
* can retrieve emitted sources, metadata, and derived hashes.
*/
class CodeGenerationResults {
/**
* Initializes an empty result store and remembers which hash function should
* be used when a result hash needs to be derived lazily.
* @param {HashFunction} hashFunction the hash function to use
*/
constructor(hashFunction = DEFAULTS.HASH_FUNCTION) {
/** @type {Map<Module, RuntimeSpecMap<CodeGenerationResult>>} */
this.map = new Map();
/** @type {HashFunction} */
this._hashFunction = hashFunction;
}
/**
* Returns the code generation result for a module/runtime pair, rejecting
* ambiguous lookups where no unique runtime-independent result exists.
* @param {Module} module the module
* @param {RuntimeSpec} runtime runtime(s)
* @returns {CodeGenerationResult} the CodeGenerationResult
*/
get(module, runtime) {
const entry = this.map.get(module);
if (entry === undefined) {
throw new Error(
`No code generation entry for ${module.identifier()} (existing entries: ${Array.from(
this.map.keys(),
(m) => m.identifier()
).join(", ")})`
);
}
if (runtime === undefined) {
if (entry.size > 1) {
const results = new Set(entry.values());
if (results.size !== 1) {
throw new Error(
`No unique code generation entry for unspecified runtime for ${module.identifier()} (existing runtimes: ${Array.from(
entry.keys(),
(r) => runtimeToString(r)
).join(", ")}).
Caller might not support runtime-dependent code generation (opt-out via optimization.usedExports: "global").`
);
}
return /** @type {CodeGenerationResult} */ (first(results));
}
return /** @type {CodeGenerationResult} */ (entry.values().next().value);
}
const result = entry.get(runtime);
if (result === undefined) {
throw new Error(
`No code generation entry for runtime ${runtimeToString(
runtime
)} for ${module.identifier()} (existing runtimes: ${Array.from(
entry.keys(),
(r) => runtimeToString(r)
).join(", ")})`
);
}
return result;
}
/**
* Reports whether a module has a stored result for the requested runtime, or
* a single unambiguous result when no runtime is specified.
* @param {Module} module the module
* @param {RuntimeSpec} runtime runtime(s)
* @returns {boolean} true, when we have data for this
*/
has(module, runtime) {
const entry = this.map.get(module);
if (entry === undefined) {
return false;
}
if (runtime !== undefined) {
return entry.has(runtime);
} else if (entry.size > 1) {
const results = new Set(entry.values());
return results.size === 1;
}
return entry.size === 1;
}
/**
* Returns a generated source of the requested source type from a stored code
* generation result.
* @param {Module} module the module
* @param {RuntimeSpec} runtime runtime(s)
* @param {SourceType} sourceType the source type
* @returns {Source} a source
*/
getSource(module, runtime, sourceType) {
return /** @type {Source} */ (
this.get(module, runtime).sources.get(sourceType)
);
}
/**
* Returns the runtime requirements captured during code generation for the
* requested module/runtime pair.
* @param {Module} module the module
* @param {RuntimeSpec} runtime runtime(s)
* @returns {ReadOnlyRuntimeRequirements | null} runtime requirements
*/
getRuntimeRequirements(module, runtime) {
return this.get(module, runtime).runtimeRequirements;
}
/**
* Returns an arbitrary metadata entry recorded during code generation.
* @param {Module} module the module
* @param {RuntimeSpec} runtime runtime(s)
* @param {string} key data key
* @returns {ReturnType<CodeGenerationResultData["get"]>} data generated by code generation
*/
getData(module, runtime, key) {
const data = this.get(module, runtime).data;
return data === undefined ? undefined : data.get(key);
}
/**
* Returns a stable hash for the generated sources and runtime requirements,
* computing and caching it on first access.
* @param {Module} module the module
* @param {RuntimeSpec} runtime runtime(s)
* @returns {string} hash of the code generation
*/
getHash(module, runtime) {
const info = this.get(module, runtime);
if (info.hash !== undefined) return info.hash;
const hash = createHash(this._hashFunction);
for (const [type, source] of info.sources) {
hash.update(type);
source.updateHash(hash);
}
if (info.runtimeRequirements) {
for (const rr of info.runtimeRequirements) hash.update(rr);
}
return (info.hash = hash.digest("hex"));
}
/**
* Stores a code generation result for a module/runtime pair, creating the
* per-module runtime map when needed.
* @param {Module} module the module
* @param {RuntimeSpec} runtime runtime(s)
* @param {CodeGenerationResult} result result from module
* @returns {void}
*/
add(module, runtime, result) {
const map = getOrInsert(
this.map,
module,
() =>
/** @type {RuntimeSpecMap<CodeGenerationResult>} */
new RuntimeSpecMap()
);
map.set(runtime, result);
}
}
module.exports = CodeGenerationResults;