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packager: Module.js: make read()-based API sync 

Reviewed By: davidaurelio

Differential Revision: D4746218

fbshipit-source-id: 1a36bd00a47a6b871cc77433b2325a11e90035b2
This commit is contained in:
Jean Lauliac 2017-03-22 08:28:18 -07:00 committed by Facebook Github Bot
parent ebd732784b
commit 51b44a5b52
1 changed files with 61 additions and 63 deletions
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124
packages/metro-bundler/src/node-haste/Module.js
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@ -74,6 +74,8 @@ export type ConstructorArgs = {
transformCode: ?TransformCode,
};
type DocBlock = {+[key: string]: string};
class Module {
path: string;
@ -88,9 +90,9 @@ class Module {
_reporter: Reporter;
_globalCache: ?GlobalTransformCache;
_docBlock: Promise<{[key: string]: string}>;
_hasteName: Promise<string | void>;
_readSourceCodePromise: Promise<string>;
_docBlock: ?DocBlock;
_hasteNameCache: ?{+hasteName: ?string};
_sourceCode: ?string;
_readPromises: Map<string, Promise<ReadResult>>;
constructor({
@ -127,7 +129,7 @@ class Module {
return this._cache.get(
this.path,
'isHaste',
() => this._getHasteName().then(name => !!name),
() => Promise.resolve(this._getHasteName() != null),
);
}
@ -143,8 +145,9 @@ class Module {
return this._cache.get(
this.path,
'name',
() => this._getHasteName().then(name => {
if (name !== undefined) {
() => Promise.resolve().then(() => {
const name = this._getHasteName();
if (name != null) {
return name;
}
@ -183,67 +186,63 @@ class Module {
invalidate() {
this._cache.invalidate(this.path);
this._readPromises.clear();
this._sourceCode = null;
this._docBlock = null;
this._hasteNameCache = null;
}
_readSourceCode() {
if (!this._readSourceCodePromise) {
this._readSourceCodePromise = new Promise(
resolve => resolve(fs.readFileSync(this.path, 'utf8'))
);
_readSourceCode(): string {
if (this._sourceCode == null) {
this._sourceCode = fs.readFileSync(this.path, 'utf8');
}
return this._readSourceCodePromise;
return this._sourceCode;
}
_readDocBlock() {
if (!this._docBlock) {
this._docBlock = this._readSourceCode()
.then(source => docblock.parseAsObject(source));
_readDocBlock(): DocBlock {
if (this._docBlock == null) {
this._docBlock = docblock.parseAsObject(this._readSourceCode());
}
return this._docBlock;
}
_getHasteName(): Promise<string | void> {
if (!this._hasteName) {
const hasteImpl = this._options.hasteImpl;
if (hasteImpl === undefined || hasteImpl.enforceHasteNameMatches) {
this._hasteName = this._readDocBlock().then(moduleDocBlock => {
const {providesModule} = moduleDocBlock;
return providesModule
&& !this._depGraphHelpers.isNodeModulesDir(this.path)
? /^\S+/.exec(providesModule)[0]
: undefined;
});
}
if (hasteImpl !== undefined) {
const {enforceHasteNameMatches} = hasteImpl;
if (enforceHasteNameMatches) {
this._hasteName = this._hasteName.then(providesModule => {
enforceHasteNameMatches(
this.path,
providesModule,
);
return hasteImpl.getHasteName(this.path);
});
} else {
this._hasteName = Promise.resolve(hasteImpl.getHasteName(this.path));
}
} else {
// Extract an id for the module if it's using @providesModule syntax
// and if it's NOT in node_modules (and not a whitelisted node_module).
// This handles the case where a project may have a dep that has @providesModule
// docblock comments, but doesn't want it to conflict with whitelisted @providesModule
// modules, such as react-haste, fbjs-haste, or react-native or with non-dependency,
// project-specific code that is using @providesModule.
this._hasteName = this._readDocBlock().then(moduleDocBlock => {
const {providesModule} = moduleDocBlock;
return providesModule
&& !this._depGraphHelpers.isNodeModulesDir(this.path)
? /^\S+/.exec(providesModule)[0]
: undefined;
});
}
_getHasteName(): ?string {
if (this._hasteNameCache != null) {
return this._hasteNameCache.hasteName;
}
return this._hasteName;
const hasteImpl = this._options.hasteImpl;
if (hasteImpl === undefined || hasteImpl.enforceHasteNameMatches) {
const moduleDocBlock = this._readDocBlock();
const {providesModule} = moduleDocBlock;
this._hasteNameCache = {
hasteName: providesModule && !this._depGraphHelpers.isNodeModulesDir(this.path)
? /^\S+/.exec(providesModule)[0]
: undefined,
};
}
if (hasteImpl !== undefined) {
const {enforceHasteNameMatches} = hasteImpl;
if (enforceHasteNameMatches) {
/* $FlowFixMe: this rely on the above if being executed, that is fragile. Rework the algo. */
enforceHasteNameMatches(this.path, this._hasteNameCache.hasteName);
}
this._hasteNameCache = {hasteName: hasteImpl.getHasteName(this.path)};
} else {
// Extract an id for the module if it's using @providesModule syntax
// and if it's NOT in node_modules (and not a whitelisted node_module).
// This handles the case where a project may have a dep that has @providesModule
// docblock comments, but doesn't want it to conflict with whitelisted @providesModule
// modules, such as react-haste, fbjs-haste, or react-native or with non-dependency,
// project-specific code that is using @providesModule.
const moduleDocBlock = this._readDocBlock();
const {providesModule} = moduleDocBlock;
this._hasteNameCache = {
hasteName:
providesModule && !this._depGraphHelpers.isNodeModulesDir(this.path)
? /^\S+/.exec(providesModule)[0]
: undefined,
};
}
return this._hasteNameCache.hasteName;
}
/**
@ -251,7 +250,7 @@ class Module {
*/
_finalizeReadResult(
source: string,
id?: string,
id: ?string,
extern: boolean,
result: TransformedCode,
): ReadResult {
@ -345,11 +344,10 @@ class Module {
if (promise != null) {
return promise;
}
const freshPromise = Promise.all([
this._readSourceCode(),
this._readDocBlock(),
this._getHasteName(),
]).then(([sourceCode, moduleDocBlock, id]) => {
const freshPromise = Promise.resolve().then(() => {
const sourceCode = this._readSourceCode();
const moduleDocBlock = this._readDocBlock();
const id = this._getHasteName();
// Ignore requires in JSON files or generated code. An example of this
// is prebuilt files like the SourceMap library.
const extern = this.isJSON() || 'extern' in moduleDocBlock;