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/// <reference path="visitor.ts" />
/// <reference path="transformers/ts.ts" />
/// <reference path="transformers/jsx.ts" />
/// <reference path="transformers/es7.ts" />
/// <reference path="transformers/es6.ts" />
/// <reference path="transformers/module/module.ts" />
/// <reference path="transformers/module/system.ts" />
/// <reference path="transformers/module/es6.ts" />
/* @internal */
namespace ts {
const moduleTransformerMap: Map<Transformer> = {
[ModuleKind.ES6]: transformES6Module,
[ModuleKind.System]: transformSystemModule,
[ModuleKind.AMD]: transformModule,
[ModuleKind.CommonJS]: transformModule,
[ModuleKind.UMD]: transformModule,
[ModuleKind.None]: transformModule,
};
const enum SyntaxKindFeatureFlags {
ExpressionSubstitution = 1 << 0,
EmitNotifications = 1 << 1,
}
export function getTransformers(compilerOptions: CompilerOptions) {
const jsx = compilerOptions.jsx;
const languageVersion = getEmitScriptTarget(compilerOptions);
const moduleKind = getEmitModuleKind(compilerOptions);
const transformers: Transformer[] = [];
transformers.push(transformTypeScript);
transformers.push(moduleTransformerMap[moduleKind]);
if (jsx === JsxEmit.React) {
transformers.push(transformJsx);
}
transformers.push(transformES7);
if (languageVersion < ScriptTarget.ES6) {
transformers.push(transformES6);
}
return transformers;
}
/**
* Transforms an array of SourceFiles by passing them through each transformer.
*
* @param resolver The emit resolver provided by the checker.
* @param host The emit host.
* @param sourceFiles An array of source files
* @param transforms An array of Transformers.
*/
export function transformFiles(resolver: EmitResolver, host: EmitHost, sourceFiles: SourceFile[], transformers: Transformer[]) {
const nodeEmitFlags: NodeEmitFlags[] = [];
const lexicalEnvironmentVariableDeclarationsStack: VariableDeclaration[][] = [];
const lexicalEnvironmentFunctionDeclarationsStack: FunctionDeclaration[][] = [];
const enabledSyntaxKindFeatures = new Array<SyntaxKindFeatureFlags>(SyntaxKind.Count);
let lexicalEnvironmentStackOffset = 0;
let hoistedVariableDeclarations: VariableDeclaration[];
let hoistedFunctionDeclarations: FunctionDeclaration[];
let currentSourceFile: SourceFile;
// The transformation context is provided to each transformer as part of transformer
// initialization.
const context: TransformationContext = {
getCompilerOptions: () => host.getCompilerOptions(),
getEmitResolver: () => resolver,
getEmitHost: () => host,
getNodeEmitFlags,
setNodeEmitFlags,
hoistVariableDeclaration,
hoistFunctionDeclaration,
startLexicalEnvironment,
endLexicalEnvironment,
identifierSubstitution: node => node,
expressionSubstitution: node => node,
enableExpressionSubstitution,
isExpressionSubstitutionEnabled,
onEmitNode: (node, emit) => emit(node),
enableEmitNotification,
isEmitNotificationEnabled,
};
// Chain together and initialize each transformer.
const transformation = chain(...transformers)(context);
// Transform each source file.
return map(sourceFiles, transformSourceFile);
/**
* Transforms a source file.
*
* @param sourceFile The source file to transform.
*/
function transformSourceFile(sourceFile: SourceFile) {
if (isDeclarationFile(sourceFile)) {
return sourceFile;
}
currentSourceFile = sourceFile;
return transformation(sourceFile);
}
function enableExpressionSubstitution(kind: SyntaxKind) {
enabledSyntaxKindFeatures[kind] |= SyntaxKindFeatureFlags.ExpressionSubstitution;
}
function isExpressionSubstitutionEnabled(node: Node) {
return (enabledSyntaxKindFeatures[node.kind] & SyntaxKindFeatureFlags.ExpressionSubstitution) !== 0;
}
function enableEmitNotification(kind: SyntaxKind) {
enabledSyntaxKindFeatures[kind] |= SyntaxKindFeatureFlags.EmitNotifications;
}
function isEmitNotificationEnabled(node: Node) {
return (enabledSyntaxKindFeatures[node.kind] & SyntaxKindFeatureFlags.EmitNotifications) !== 0
|| (getNodeEmitFlags(node) & NodeEmitFlags.AdviseOnEmitNode) !== 0;
}
/**
* Gets flags that control emit behavior of a node.
*/
function getNodeEmitFlags(node: Node) {
while (node) {
const nodeId = getNodeId(node);
if (nodeEmitFlags[nodeId] !== undefined) {
return nodeEmitFlags[nodeId];
}
node = node.original;
}
return undefined;
}
/**
* Sets flags that control emit behavior of a node.
*/
function setNodeEmitFlags<T extends Node>(node: T, flags: NodeEmitFlags) {
nodeEmitFlags[getNodeId(node)] = flags;
return node;
}
/**
* Records a hoisted variable declaration for the provided name within a lexical environment.
*/
function hoistVariableDeclaration(name: Identifier): void {
const decl = createVariableDeclaration(name);
if (!hoistedVariableDeclarations) {
hoistedVariableDeclarations = [decl];
}
else {
hoistedVariableDeclarations.push(decl);
}
}
/**
* Records a hoisted function declaration within a lexical environment.
*/
function hoistFunctionDeclaration(func: FunctionDeclaration): void {
if (!hoistedFunctionDeclarations) {
hoistedFunctionDeclarations = [func];
}
else {
hoistedFunctionDeclarations.push(func);
}
}
/**
* Starts a new lexical environment. Any existing hoisted variable or function declarations
* are pushed onto a stack, and the related storage variables are reset.
*/
function startLexicalEnvironment(): void {
// Save the current lexical environment. Rather than resizing the array we adjust the
// stack size variable. This allows us to reuse existing array slots we've
// already allocated between transformations to avoid allocation and GC overhead during
// transformation.
lexicalEnvironmentVariableDeclarationsStack[lexicalEnvironmentStackOffset] = hoistedVariableDeclarations;
lexicalEnvironmentFunctionDeclarationsStack[lexicalEnvironmentStackOffset] = hoistedFunctionDeclarations;
lexicalEnvironmentStackOffset++;
hoistedVariableDeclarations = undefined;
hoistedFunctionDeclarations = undefined;
}
/**
* Ends a lexical environment. The previous set of hoisted declarations are restored and
* any hoisted declarations added in this environment are returned.
*/
function endLexicalEnvironment(): Statement[] {
let statements: Statement[];
if (hoistedVariableDeclarations || hoistedFunctionDeclarations) {
if (hoistedFunctionDeclarations) {
statements = [...hoistedFunctionDeclarations];
}
if (hoistedVariableDeclarations) {
const statement = createVariableStatement(
/*modifiers*/ undefined,
createVariableDeclarationList(hoistedVariableDeclarations)
);
if (!statements) {
statements = [statement];
}
else {
statements.push(statement);
}
}
}
// Restore the previous lexical environment.
lexicalEnvironmentStackOffset--;
hoistedVariableDeclarations = lexicalEnvironmentVariableDeclarationsStack[lexicalEnvironmentStackOffset];
hoistedFunctionDeclarations = lexicalEnvironmentFunctionDeclarationsStack[lexicalEnvironmentStackOffset];
return statements;
}
}
/**
* High-order function, creates a function that executes a function composition.
* For example, `chain(a, b)` is the equivalent of `x => ((a', b') => y => b'(a'(y)))(a(x), b(x))`
*
* @param args The functions to chain.
*/
function chain<T, U>(...args: ((t: T) => (u: U) => U)[]): (t: T) => (u: U) => U;
function chain<T, U>(a: (t: T) => (u: U) => U, b: (t: T) => (u: U) => U, c: (t: T) => (u: U) => U, d: (t: T) => (u: U) => U, e: (t: T) => (u: U) => U): (t: T) => (u: U) => U {
if (e) {
const args = arrayOf<(t: T) => (u: U) => U>(arguments);
return t => compose(...map(args, f => f(t)));
}
else if (d) {
return t => compose(a(t), b(t), c(t), d(t));
}
else if (c) {
return t => compose(a(t), b(t), c(t));
}
else if (b) {
return t => compose(a(t), b(t));
}
else if (a) {
return t => compose(a(t));
}
else {
return t => u => u;
}
}
/**
* High-order function, composes functions. Note that functions are composed inside-out;
* for example, `compose(a, b)` is the equivalent of `x => b(a(x))`.
*
* @param args The functions to compose.
*/
function compose<T>(...args: ((t: T) => T)[]): (t: T) => T;
function compose<T>(a: (t: T) => T, b: (t: T) => T, c: (t: T) => T, d: (t: T) => T, e: (t: T) => T): (t: T) => T {
if (e) {
const args = arrayOf(arguments);
return t => reduceLeft<(t: T) => T, T>(args, (u, f) => f(u), t);
}
else if (d) {
return t => d(c(b(a(t))));
}
else if (c) {
return t => c(b(a(t)));
}
else if (b) {
return t => b(a(t));
}
else if (a) {
return t => a(t);
}
else {
return t => t;
}
}
/**
* Makes an array from an ArrayLike.
*/
function arrayOf<T>(arrayLike: ArrayLike<T>) {
const length = arrayLike.length;
const array: T[] = new Array<T>(length);
for (let i = 0; i < length; i++) {
array[i] = arrayLike[i];
}
return array;
}
}