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Copy pathpreProcess.ts
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436 lines (403 loc) · 18.6 KB
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namespace ts {
export function preProcessFile(sourceText: string, readImportFiles = true, detectJavaScriptImports = false): PreProcessedFileInfo {
const pragmaContext: PragmaContext = {
languageVersion: ScriptTarget.ES5, // controls whether the token scanner considers unicode identifiers or not - shouldn't matter, since we're only using it for trivia
pragmas: undefined,
checkJsDirective: undefined,
referencedFiles: [],
typeReferenceDirectives: [],
libReferenceDirectives: [],
amdDependencies: [],
hasNoDefaultLib: undefined,
moduleName: undefined
};
const importedFiles: FileReference[] = [];
let ambientExternalModules: { ref: FileReference, depth: number }[] | undefined;
let lastToken: SyntaxKind;
let currentToken: SyntaxKind;
let braceNesting = 0;
// assume that text represent an external module if it contains at least one top level import/export
// ambient modules that are found inside external modules are interpreted as module augmentations
let externalModule = false;
function nextToken() {
lastToken = currentToken;
currentToken = scanner.scan();
if (currentToken === SyntaxKind.OpenBraceToken) {
braceNesting++;
}
else if (currentToken === SyntaxKind.CloseBraceToken) {
braceNesting--;
}
return currentToken;
}
function getFileReference() {
const fileName = scanner.getTokenValue();
const pos = scanner.getTokenPos();
return { fileName, pos, end: pos + fileName.length };
}
function recordAmbientExternalModule(): void {
if (!ambientExternalModules) {
ambientExternalModules = [];
}
ambientExternalModules.push({ ref: getFileReference(), depth: braceNesting });
}
function recordModuleName() {
importedFiles.push(getFileReference());
markAsExternalModuleIfTopLevel();
}
function markAsExternalModuleIfTopLevel() {
if (braceNesting === 0) {
externalModule = true;
}
}
/**
* Returns true if at least one token was consumed from the stream
*/
function tryConsumeDeclare(): boolean {
let token = scanner.getToken();
if (token === SyntaxKind.DeclareKeyword) {
// declare module "mod"
token = nextToken();
if (token === SyntaxKind.ModuleKeyword) {
token = nextToken();
if (token === SyntaxKind.StringLiteral) {
recordAmbientExternalModule();
}
}
return true;
}
return false;
}
/**
* Returns true if at least one token was consumed from the stream
*/
function tryConsumeImport(): boolean {
if (lastToken === SyntaxKind.DotToken) {
return false;
}
let token = scanner.getToken();
if (token === SyntaxKind.ImportKeyword) {
token = nextToken();
if (token === SyntaxKind.OpenParenToken) {
token = nextToken();
if (token === SyntaxKind.StringLiteral || token === SyntaxKind.NoSubstitutionTemplateLiteral) {
// import("mod");
recordModuleName();
return true;
}
}
else if (token === SyntaxKind.StringLiteral) {
// import "mod";
recordModuleName();
return true;
}
else {
if (token === SyntaxKind.TypeKeyword) {
const skipTypeKeyword = scanner.lookAhead(() => {
const token = scanner.scan();
return token !== SyntaxKind.FromKeyword && (
token === SyntaxKind.AsteriskToken ||
token === SyntaxKind.OpenBraceToken ||
token === SyntaxKind.Identifier ||
isKeyword(token)
);
});
if (skipTypeKeyword) {
token = nextToken();
}
}
if (token === SyntaxKind.Identifier || isKeyword(token)) {
token = nextToken();
if (token === SyntaxKind.FromKeyword) {
token = nextToken();
if (token === SyntaxKind.StringLiteral) {
// import d from "mod";
recordModuleName();
return true;
}
}
else if (token === SyntaxKind.EqualsToken) {
if (tryConsumeRequireCall(/*skipCurrentToken*/ true)) {
return true;
}
}
else if (token === SyntaxKind.CommaToken) {
// consume comma and keep going
token = nextToken();
}
else {
// unknown syntax
return true;
}
}
if (token === SyntaxKind.OpenBraceToken) {
token = nextToken();
// consume "{ a as B, c, d as D}" clauses
// make sure that it stops on EOF
while (token !== SyntaxKind.CloseBraceToken && token !== SyntaxKind.EndOfFileToken) {
token = nextToken();
}
if (token === SyntaxKind.CloseBraceToken) {
token = nextToken();
if (token === SyntaxKind.FromKeyword) {
token = nextToken();
if (token === SyntaxKind.StringLiteral) {
// import {a as A} from "mod";
// import d, {a, b as B} from "mod"
recordModuleName();
}
}
}
}
else if (token === SyntaxKind.AsteriskToken) {
token = nextToken();
if (token === SyntaxKind.AsKeyword) {
token = nextToken();
if (token === SyntaxKind.Identifier || isKeyword(token)) {
token = nextToken();
if (token === SyntaxKind.FromKeyword) {
token = nextToken();
if (token === SyntaxKind.StringLiteral) {
// import * as NS from "mod"
// import d, * as NS from "mod"
recordModuleName();
}
}
}
}
}
}
return true;
}
return false;
}
function tryConsumeExport(): boolean {
let token = scanner.getToken();
if (token === SyntaxKind.ExportKeyword) {
markAsExternalModuleIfTopLevel();
token = nextToken();
if (token === SyntaxKind.TypeKeyword) {
const skipTypeKeyword = scanner.lookAhead(() => {
const token = scanner.scan();
return token === SyntaxKind.AsteriskToken ||
token === SyntaxKind.OpenBraceToken;
});
if (skipTypeKeyword) {
token = nextToken();
}
}
if (token === SyntaxKind.OpenBraceToken) {
token = nextToken();
// consume "{ a as B, c, d as D}" clauses
// make sure it stops on EOF
while (token !== SyntaxKind.CloseBraceToken && token !== SyntaxKind.EndOfFileToken) {
token = nextToken();
}
if (token === SyntaxKind.CloseBraceToken) {
token = nextToken();
if (token === SyntaxKind.FromKeyword) {
token = nextToken();
if (token === SyntaxKind.StringLiteral) {
// export {a as A} from "mod";
// export {a, b as B} from "mod"
recordModuleName();
}
}
}
}
else if (token === SyntaxKind.AsteriskToken) {
token = nextToken();
if (token === SyntaxKind.FromKeyword) {
token = nextToken();
if (token === SyntaxKind.StringLiteral) {
// export * from "mod"
recordModuleName();
}
}
}
else if (token === SyntaxKind.ImportKeyword) {
token = nextToken();
if (token === SyntaxKind.TypeKeyword) {
const skipTypeKeyword = scanner.lookAhead(() => {
const token = scanner.scan();
return token === SyntaxKind.Identifier ||
isKeyword(token);
});
if (skipTypeKeyword) {
token = nextToken();
}
}
if (token === SyntaxKind.Identifier || isKeyword(token)) {
token = nextToken();
if (token === SyntaxKind.EqualsToken) {
if (tryConsumeRequireCall(/*skipCurrentToken*/ true)) {
return true;
}
}
}
}
return true;
}
return false;
}
function tryConsumeRequireCall(skipCurrentToken: boolean, allowTemplateLiterals = false): boolean {
let token = skipCurrentToken ? nextToken() : scanner.getToken();
if (token === SyntaxKind.RequireKeyword) {
token = nextToken();
if (token === SyntaxKind.OpenParenToken) {
token = nextToken();
if (token === SyntaxKind.StringLiteral ||
allowTemplateLiterals && token === SyntaxKind.NoSubstitutionTemplateLiteral) {
// require("mod");
recordModuleName();
}
}
return true;
}
return false;
}
function tryConsumeDefine(): boolean {
let token = scanner.getToken();
if (token === SyntaxKind.Identifier && scanner.getTokenValue() === "define") {
token = nextToken();
if (token !== SyntaxKind.OpenParenToken) {
return true;
}
token = nextToken();
if (token === SyntaxKind.StringLiteral || token === SyntaxKind.NoSubstitutionTemplateLiteral) {
// looks like define ("modname", ... - skip string literal and comma
token = nextToken();
if (token === SyntaxKind.CommaToken) {
token = nextToken();
}
else {
// unexpected token
return true;
}
}
// should be start of dependency list
if (token !== SyntaxKind.OpenBracketToken) {
return true;
}
// skip open bracket
token = nextToken();
// scan until ']' or EOF
while (token !== SyntaxKind.CloseBracketToken && token !== SyntaxKind.EndOfFileToken) {
// record string literals as module names
if (token === SyntaxKind.StringLiteral || token === SyntaxKind.NoSubstitutionTemplateLiteral) {
recordModuleName();
}
token = nextToken();
}
return true;
}
return false;
}
function processImports(): void {
scanner.setText(sourceText);
nextToken();
// Look for:
// import "mod";
// import d from "mod"
// import {a as A } from "mod";
// import * as NS from "mod"
// import d, {a, b as B} from "mod"
// import i = require("mod");
// import("mod");
// export * from "mod"
// export {a as b} from "mod"
// export import i = require("mod")
// (for JavaScript files) require("mod")
// Do not look for:
// AnySymbol.import("mod")
// AnySymbol.nested.import("mod")
while (true) {
if (scanner.getToken() === SyntaxKind.EndOfFileToken) {
break;
}
if (scanner.getToken() === SyntaxKind.TemplateHead) {
const stack = [scanner.getToken()];
let token = scanner.scan();
loop: while (length(stack)) {
switch (token) {
case SyntaxKind.EndOfFileToken:
break loop;
case SyntaxKind.ImportKeyword:
tryConsumeImport();
break;
case SyntaxKind.TemplateHead:
stack.push(token);
break;
case SyntaxKind.OpenBraceToken:
if (length(stack)) {
stack.push(token);
}
break;
case SyntaxKind.CloseBraceToken:
if (length(stack)) {
if (lastOrUndefined(stack) === SyntaxKind.TemplateHead) {
if (scanner.reScanTemplateToken(/* isTaggedTemplate */ false) === SyntaxKind.TemplateTail) {
stack.pop();
}
}
else {
stack.pop();
}
}
break;
}
token = scanner.scan();
}
nextToken();
}
// check if at least one of alternative have moved scanner forward
if (tryConsumeDeclare() ||
tryConsumeImport() ||
tryConsumeExport() ||
(detectJavaScriptImports && (
tryConsumeRequireCall(/*skipCurrentToken*/ false, /*allowTemplateLiterals*/ true) ||
tryConsumeDefine()
))) {
continue;
}
else {
nextToken();
}
}
scanner.setText(undefined);
}
if (readImportFiles) {
processImports();
}
processCommentPragmas(pragmaContext, sourceText);
processPragmasIntoFields(pragmaContext, noop);
if (externalModule) {
// for external modules module all nested ambient modules are augmentations
if (ambientExternalModules) {
// move all detected ambient modules to imported files since they need to be resolved
for (const decl of ambientExternalModules) {
importedFiles.push(decl.ref);
}
}
return { referencedFiles: pragmaContext.referencedFiles, typeReferenceDirectives: pragmaContext.typeReferenceDirectives, libReferenceDirectives: pragmaContext.libReferenceDirectives, importedFiles, isLibFile: !!pragmaContext.hasNoDefaultLib, ambientExternalModules: undefined };
}
else {
// for global scripts ambient modules still can have augmentations - look for ambient modules with depth > 0
let ambientModuleNames: string[] | undefined;
if (ambientExternalModules) {
for (const decl of ambientExternalModules) {
if (decl.depth === 0) {
if (!ambientModuleNames) {
ambientModuleNames = [];
}
ambientModuleNames.push(decl.ref.fileName);
}
else {
importedFiles.push(decl.ref);
}
}
}
return { referencedFiles: pragmaContext.referencedFiles, typeReferenceDirectives: pragmaContext.typeReferenceDirectives, libReferenceDirectives: pragmaContext.libReferenceDirectives, importedFiles, isLibFile: !!pragmaContext.hasNoDefaultLib, ambientExternalModules: ambientModuleNames };
}
}
}
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