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Copy pathprogram.ts
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1853 lines (1611 loc) · 96.7 KB
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/// <reference path="sys.ts" />
/// <reference path="emitter.ts" />
/// <reference path="core.ts" />
namespace ts {
/* @internal */ export let programTime = 0;
/* @internal */ export let emitTime = 0;
/* @internal */ export let ioReadTime = 0;
/* @internal */ export let ioWriteTime = 0;
/** The version of the TypeScript compiler release */
const emptyArray: any[] = [];
export const version = "1.9.0";
export function findConfigFile(searchPath: string, fileExists: (fileName: string) => boolean): string {
while (true) {
const fileName = combinePaths(searchPath, "tsconfig.json");
if (fileExists(fileName)) {
return fileName;
}
const parentPath = getDirectoryPath(searchPath);
if (parentPath === searchPath) {
break;
}
searchPath = parentPath;
}
return undefined;
}
export function resolveTripleslashReference(moduleName: string, containingFile: string): string {
const basePath = getDirectoryPath(containingFile);
const referencedFileName = isRootedDiskPath(moduleName) ? moduleName : combinePaths(basePath, moduleName);
return normalizePath(referencedFileName);
}
function trace(host: ModuleResolutionHost, message: DiagnosticMessage, ...args: any[]): void;
function trace(host: ModuleResolutionHost, message: DiagnosticMessage): void {
host.trace(formatMessage.apply(undefined, arguments));
}
function isTraceEnabled(compilerOptions: CompilerOptions, host: ModuleResolutionHost): boolean {
return compilerOptions.traceModuleResolution && host.trace !== undefined;
}
function hasZeroOrOneAsteriskCharacter(str: string): boolean {
let seenAsterisk = false;
for (let i = 0; i < str.length; i++) {
if (str.charCodeAt(i) === CharacterCodes.asterisk) {
if (!seenAsterisk) {
seenAsterisk = true;
}
else {
// have already seen asterisk
return false;
}
}
}
return true;
}
function createResolvedModule(resolvedFileName: string, isExternalLibraryImport: boolean, failedLookupLocations: string[]): ResolvedModuleWithFailedLookupLocations {
return { resolvedModule: resolvedFileName ? { resolvedFileName, isExternalLibraryImport } : undefined, failedLookupLocations };
}
function moduleHasNonRelativeName(moduleName: string): boolean {
if (isRootedDiskPath(moduleName)) {
return false;
}
const i = moduleName.lastIndexOf("./", 1);
const startsWithDotSlashOrDotDotSlash = i === 0 || (i === 1 && moduleName.charCodeAt(0) === CharacterCodes.dot);
return !startsWithDotSlashOrDotDotSlash;
}
interface ModuleResolutionState {
host: ModuleResolutionHost;
compilerOptions: CompilerOptions;
traceEnabled: boolean;
// skip .tsx files if jsx is not enabled
skipTsx: boolean;
}
export function resolveModuleName(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost): ResolvedModuleWithFailedLookupLocations {
const traceEnabled = isTraceEnabled(compilerOptions, host);
if (traceEnabled) {
trace(host, Diagnostics.Resolving_module_0_from_1, moduleName, containingFile);
}
let moduleResolution = compilerOptions.moduleResolution;
if (moduleResolution === undefined) {
moduleResolution = getEmitModuleKind(compilerOptions) === ModuleKind.CommonJS ? ModuleResolutionKind.NodeJs : ModuleResolutionKind.Classic;
if (traceEnabled) {
trace(host, Diagnostics.Module_resolution_kind_is_not_specified_using_0, ModuleResolutionKind[moduleResolution]);
}
}
else {
if (traceEnabled) {
trace(host, Diagnostics.Explicitly_specified_module_resolution_kind_Colon_0, ModuleResolutionKind[moduleResolution]);
}
}
let result: ResolvedModuleWithFailedLookupLocations;
switch (moduleResolution) {
case ModuleResolutionKind.NodeJs:
result = nodeModuleNameResolver(moduleName, containingFile, compilerOptions, host);
break;
case ModuleResolutionKind.Classic:
result = classicNameResolver(moduleName, containingFile, compilerOptions, host);
break;
}
if (traceEnabled) {
if (result.resolvedModule) {
trace(host, Diagnostics.Module_name_0_was_successfully_resolved_to_1, moduleName, result.resolvedModule.resolvedFileName);
}
else {
trace(host, Diagnostics.Module_name_0_was_not_resolved, moduleName);
}
}
return result;
}
/*
* Every module resolution kind can has its specific understanding how to load module from a specific path on disk
* I.e. for path '/a/b/c':
* - Node loader will first to try to check if '/a/b/c' points to a file with some supported extension and if this fails
* it will try to load module from directory: directory '/a/b/c' should exist and it should have either 'package.json' with
* 'typings' entry or file 'index' with some supported extension
* - Classic loader will only try to interpret '/a/b/c' as file.
*/
type ResolutionKindSpecificLoader = (candidate: string, extensions: string[], failedLookupLocations: string[], onlyRecordFailures: boolean, state: ModuleResolutionState) => string;
/**
* Any module resolution kind can be augmented with optional settings: 'baseUrl', 'paths' and 'rootDirs' - they are used to
* mitigate differences between design time structure of the project and its runtime counterpart so the same import name
* can be resolved successfully by TypeScript compiler and runtime module loader.
* If these settings are set then loading procedure will try to use them to resolve module name and it can of failure it will
* fallback to standard resolution routine.
*
* - baseUrl - this setting controls how non-relative module names are resolved. If this setting is specified then non-relative
* names will be resolved relative to baseUrl: i.e. if baseUrl is '/a/b' then candidate location to resolve module name 'c/d' will
* be '/a/b/c/d'
* - paths - this setting can only be used when baseUrl is specified. allows to tune how non-relative module names
* will be resolved based on the content of the module name.
* Structure of 'paths' compiler options
* 'paths': {
* pattern-1: [...substitutions],
* pattern-2: [...substitutions],
* ...
* pattern-n: [...substitutions]
* }
* Pattern here is a string that can contain zero or one '*' character. During module resolution module name will be matched against
* all patterns in the list. Matching for patterns that don't contain '*' means that module name must be equal to pattern respecting the case.
* If pattern contains '*' then to match pattern "<prefix>*<suffix>" module name must start with the <prefix> and end with <suffix>.
* <MatchedStar> denotes part of the module name between <prefix> and <suffix>.
* If module name can be matches with multiple patterns then pattern with the longest prefix will be picked.
* After selecting pattern we'll use list of substitutions to get candidate locations of the module and the try to load module
* from the candidate location.
* Substitution is a string that can contain zero or one '*'. To get candidate location from substitution we'll pick every
* substitution in the list and replace '*' with <MatchedStar> string. If candidate location is not rooted it
* will be converted to absolute using baseUrl.
* For example:
* baseUrl: /a/b/c
* "paths": {
* // match all module names
* "*": [
* "*", // use matched name as is,
* // <matched name> will be looked as /a/b/c/<matched name>
*
* "folder1/*" // substitution will convert matched name to 'folder1/<matched name>',
* // since it is not rooted then final candidate location will be /a/b/c/folder1/<matched name>
* ],
* // match module names that start with 'components/'
* "components/*": [ "/root/components/*" ] // substitution will convert /components/folder1/<matched name> to '/root/components/folder1/<matched name>',
* // it is rooted so it will be final candidate location
* }
*
* 'rootDirs' allows the project to be spreaded across multiple locations and resolve modules with relative names as if
* they were in the same location. For example lets say there are two files
* '/local/src/content/file1.ts'
* '/shared/components/contracts/src/content/protocols/file2.ts'
* After bundling content of '/shared/components/contracts/src' will be merged with '/local/src' so
* if file1 has the following import 'import {x} from "./protocols/file2"' it will be resolved successfully in runtime.
* 'rootDirs' provides the way to tell compiler that in order to get the whole project it should behave as if content of all
* root dirs were merged together.
* I.e. for the example above 'rootDirs' will have two entries: [ '/local/src', '/shared/components/contracts/src' ].
* Compiler will first convert './protocols/file2' into absolute path relative to the location of containing file:
* '/local/src/content/protocols/file2' and try to load it - failure.
* Then it will search 'rootDirs' looking for a longest matching prefix of this absolute path and if such prefix is found - absolute path will
* be converted to a path relative to found rootDir entry './content/protocols/file2' (*). As a last step compiler will check all remaining
* entries in 'rootDirs', use them to build absolute path out of (*) and try to resolve module from this location.
*/
function tryLoadModuleUsingOptionalResolutionSettings(moduleName: string, containingDirectory: string, loader: ResolutionKindSpecificLoader,
failedLookupLocations: string[], supportedExtensions: string[], state: ModuleResolutionState): string {
if (moduleHasNonRelativeName(moduleName)) {
return tryLoadModuleUsingBaseUrl(moduleName, loader, failedLookupLocations, supportedExtensions, state);
}
else {
return tryLoadModuleUsingRootDirs(moduleName, containingDirectory, loader, failedLookupLocations, supportedExtensions, state);
}
}
function tryLoadModuleUsingRootDirs(moduleName: string, containingDirectory: string, loader: ResolutionKindSpecificLoader,
failedLookupLocations: string[], supportedExtensions: string[], state: ModuleResolutionState): string {
if (!state.compilerOptions.rootDirs) {
return undefined;
}
if (state.traceEnabled) {
trace(state.host, Diagnostics.rootDirs_option_is_set_using_it_to_resolve_relative_module_name_0, moduleName);
}
const candidate = normalizePath(combinePaths(containingDirectory, moduleName));
let matchedRootDir: string;
let matchedNormalizedPrefix: string;
for (const rootDir of state.compilerOptions.rootDirs) {
// rootDirs are expected to be absolute
// in case of tsconfig.json this will happen automatically - compiler will expand relative names
// using location of tsconfig.json as base location
let normalizedRoot = normalizePath(rootDir);
if (!endsWith(normalizedRoot, directorySeparator)) {
normalizedRoot += directorySeparator;
}
const isLongestMatchingPrefix =
startsWith(candidate, normalizedRoot) &&
(matchedNormalizedPrefix === undefined || matchedNormalizedPrefix.length < normalizedRoot.length);
if (state.traceEnabled) {
trace(state.host, Diagnostics.Checking_if_0_is_the_longest_matching_prefix_for_1_2, normalizedRoot, candidate, isLongestMatchingPrefix);
}
if (isLongestMatchingPrefix) {
matchedNormalizedPrefix = normalizedRoot;
matchedRootDir = rootDir;
}
}
if (matchedNormalizedPrefix) {
if (state.traceEnabled) {
trace(state.host, Diagnostics.Longest_matching_prefix_for_0_is_1, candidate, matchedNormalizedPrefix);
}
const suffix = candidate.substr(matchedNormalizedPrefix.length);
// first - try to load from a initial location
if (state.traceEnabled) {
trace(state.host, Diagnostics.Loading_0_from_the_root_dir_1_candidate_location_2, suffix, matchedNormalizedPrefix, candidate);
}
const resolvedFileName = loader(candidate, supportedExtensions, failedLookupLocations, !directoryProbablyExists(containingDirectory, state.host), state);
if (resolvedFileName) {
return resolvedFileName;
}
if (state.traceEnabled) {
trace(state.host, Diagnostics.Trying_other_entries_in_rootDirs);
}
// then try to resolve using remaining entries in rootDirs
for (const rootDir of state.compilerOptions.rootDirs) {
if (rootDir === matchedRootDir) {
// skip the initially matched entry
continue;
}
const candidate = combinePaths(normalizePath(rootDir), suffix);
if (state.traceEnabled) {
trace(state.host, Diagnostics.Loading_0_from_the_root_dir_1_candidate_location_2, suffix, rootDir, candidate);
}
const baseDirectory = getDirectoryPath(candidate);
const resolvedFileName = loader(candidate, supportedExtensions, failedLookupLocations, !directoryProbablyExists(baseDirectory, state.host), state);
if (resolvedFileName) {
return resolvedFileName;
}
}
if (state.traceEnabled) {
trace(state.host, Diagnostics.Module_resolution_using_rootDirs_has_failed);
}
}
return undefined;
}
function tryLoadModuleUsingBaseUrl(moduleName: string, loader: ResolutionKindSpecificLoader, failedLookupLocations: string[],
supportedExtensions: string[], state: ModuleResolutionState): string {
if (!state.compilerOptions.baseUrl) {
return undefined;
}
if (state.traceEnabled) {
trace(state.host, Diagnostics.baseUrl_option_is_set_to_0_using_this_value_to_resolve_non_relative_module_name_1, state.compilerOptions.baseUrl, moduleName);
}
let longestMatchPrefixLength = -1;
let matchedPattern: string;
let matchedStar: string;
if (state.compilerOptions.paths) {
if (state.traceEnabled) {
trace(state.host, Diagnostics.paths_option_is_specified_looking_for_a_pattern_to_match_module_name_0, moduleName);
}
for (const key in state.compilerOptions.paths) {
const pattern: string = key;
const indexOfStar = pattern.indexOf("*");
if (indexOfStar !== -1) {
const prefix = pattern.substr(0, indexOfStar);
const suffix = pattern.substr(indexOfStar + 1);
if (moduleName.length >= prefix.length + suffix.length &&
startsWith(moduleName, prefix) &&
endsWith(moduleName, suffix)) {
// use length of prefix as betterness criteria
if (prefix.length > longestMatchPrefixLength) {
longestMatchPrefixLength = prefix.length;
matchedPattern = pattern;
matchedStar = moduleName.substr(prefix.length, moduleName.length - suffix.length);
}
}
}
else if (pattern === moduleName) {
// pattern was matched as is - no need to search further
matchedPattern = pattern;
matchedStar = undefined;
break;
}
}
}
if (matchedPattern) {
if (state.traceEnabled) {
trace(state.host, Diagnostics.Module_name_0_matched_pattern_1, moduleName, matchedPattern);
}
for (const subst of state.compilerOptions.paths[matchedPattern]) {
const path = matchedStar ? subst.replace("\*", matchedStar) : subst;
const candidate = normalizePath(combinePaths(state.compilerOptions.baseUrl, path));
if (state.traceEnabled) {
trace(state.host, Diagnostics.Trying_substitution_0_candidate_module_location_Colon_1, subst, path);
}
const resolvedFileName = loader(candidate, supportedExtensions, failedLookupLocations, !directoryProbablyExists(getDirectoryPath(candidate), state.host), state);
if (resolvedFileName) {
return resolvedFileName;
}
}
return undefined;
}
else {
const candidate = normalizePath(combinePaths(state.compilerOptions.baseUrl, moduleName));
if (state.traceEnabled) {
trace(state.host, Diagnostics.Resolving_module_name_0_relative_to_base_url_1_2, moduleName, state.compilerOptions.baseUrl, candidate);
}
return loader(candidate, supportedExtensions, failedLookupLocations, !directoryProbablyExists(getDirectoryPath(candidate), state.host), state);
}
}
export function nodeModuleNameResolver(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost): ResolvedModuleWithFailedLookupLocations {
const containingDirectory = getDirectoryPath(containingFile);
const supportedExtensions = getSupportedExtensions(compilerOptions);
const traceEnabled = isTraceEnabled(compilerOptions, host);
const failedLookupLocations: string[] = [];
const state = {compilerOptions, host, traceEnabled, skipTsx: false};
let resolvedFileName = tryLoadModuleUsingOptionalResolutionSettings(moduleName, containingDirectory, nodeLoadModuleByRelativeName,
failedLookupLocations, supportedExtensions, state);
if (resolvedFileName) {
return createResolvedModule(resolvedFileName, /*isExternalLibraryImport*/false, failedLookupLocations);
}
let isExternalLibraryImport = false;
if (moduleHasNonRelativeName(moduleName)) {
if (traceEnabled) {
trace(host, Diagnostics.Loading_module_0_from_node_modules_folder, moduleName);
}
resolvedFileName = loadModuleFromNodeModules(moduleName, containingDirectory, failedLookupLocations, state);
isExternalLibraryImport = resolvedFileName !== undefined;
}
else {
const candidate = normalizePath(combinePaths(containingDirectory, moduleName));
resolvedFileName = nodeLoadModuleByRelativeName(candidate, supportedExtensions, failedLookupLocations, /*onlyRecordFailures*/ false, state);
}
return createResolvedModule(resolvedFileName, isExternalLibraryImport, failedLookupLocations);
}
function nodeLoadModuleByRelativeName(candidate: string, supportedExtensions: string[], failedLookupLocations: string[],
onlyRecordFailures: boolean, state: ModuleResolutionState): string {
if (state.traceEnabled) {
trace(state.host, Diagnostics.Loading_module_as_file_Slash_folder_candidate_module_location_0, candidate);
}
const resolvedFileName = loadModuleFromFile(candidate, supportedExtensions, failedLookupLocations, onlyRecordFailures, state);
return resolvedFileName || loadNodeModuleFromDirectory(supportedExtensions, candidate, failedLookupLocations, onlyRecordFailures, state);
}
/* @internal */
export function directoryProbablyExists(directoryName: string, host: { directoryExists?: (directoryName: string) => boolean } ): boolean {
// if host does not support 'directoryExists' assume that directory will exist
return !host.directoryExists || host.directoryExists(directoryName);
}
/**
* @param {boolean} onlyRecordFailures - if true then function won't try to actually load files but instead record all attempts as failures. This flag is necessary
* in cases when we know upfront that all load attempts will fail (because containing folder does not exists) however we still need to record all failed lookup locations.
*/
function loadModuleFromFile(candidate: string, extensions: string[], failedLookupLocation: string[], onlyRecordFailures: boolean, state: ModuleResolutionState): string {
return forEach(extensions, tryLoad);
function tryLoad(ext: string): string {
if (ext === ".tsx" && state.skipTsx) {
return undefined;
}
const fileName = fileExtensionIs(candidate, ext) ? candidate : candidate + ext;
if (!onlyRecordFailures && state.host.fileExists(fileName)) {
if (state.traceEnabled) {
trace(state.host, Diagnostics.File_0_exist_use_it_as_a_module_resolution_result, fileName);
}
return fileName;
}
else {
if (state.traceEnabled) {
trace(state.host, Diagnostics.File_0_does_not_exist, fileName);
}
failedLookupLocation.push(fileName);
return undefined;
}
}
}
function loadNodeModuleFromDirectory(extensions: string[], candidate: string, failedLookupLocation: string[], onlyRecordFailures: boolean, state: ModuleResolutionState): string {
const packageJsonPath = combinePaths(candidate, "package.json");
const directoryExists = !onlyRecordFailures && directoryProbablyExists(candidate, state.host);
if (directoryExists && state.host.fileExists(packageJsonPath)) {
if (state.traceEnabled) {
trace(state.host, Diagnostics.Found_package_json_at_0, packageJsonPath);
}
let jsonContent: { typings?: string };
try {
const jsonText = state.host.readFile(packageJsonPath);
jsonContent = jsonText ? <{ typings?: string }>JSON.parse(jsonText) : { typings: undefined };
}
catch (e) {
// gracefully handle if readFile fails or returns not JSON
jsonContent = { typings: undefined };
}
if (jsonContent.typings) {
if (typeof jsonContent.typings === "string") {
const typingsFile = normalizePath(combinePaths(candidate, jsonContent.typings));
if (state.traceEnabled) {
trace(state.host, Diagnostics.package_json_has_typings_field_0_that_references_1, jsonContent.typings, typingsFile);
}
const result = loadModuleFromFile(typingsFile, extensions, failedLookupLocation, !directoryProbablyExists(getDirectoryPath(typingsFile), state.host), state);
if (result) {
return result;
}
}
else if (state.traceEnabled) {
trace(state.host, Diagnostics.Expected_type_of_typings_field_in_package_json_to_be_string_got_0, typeof jsonContent.typings);
}
}
else {
if (state.traceEnabled) {
trace(state.host, Diagnostics.package_json_does_not_have_typings_field);
}
}
}
else {
if (state.traceEnabled) {
trace(state.host, Diagnostics.File_0_does_not_exist, packageJsonPath);
}
// record package json as one of failed lookup locations - in the future if this file will appear it will invalidate resolution results
failedLookupLocation.push(packageJsonPath);
}
return loadModuleFromFile(combinePaths(candidate, "index"), extensions, failedLookupLocation, !directoryExists, state);
}
function loadModuleFromNodeModules(moduleName: string, directory: string, failedLookupLocations: string[], state: ModuleResolutionState): string {
directory = normalizeSlashes(directory);
while (true) {
const baseName = getBaseFileName(directory);
if (baseName !== "node_modules") {
const nodeModulesFolder = combinePaths(directory, "node_modules");
const nodeModulesFolderExists = directoryProbablyExists(nodeModulesFolder, state.host);
const candidate = normalizePath(combinePaths(nodeModulesFolder, moduleName));
// Load only typescript files irrespective of allowJs option if loading from node modules
let result = loadModuleFromFile(candidate, supportedTypeScriptExtensions, failedLookupLocations, !nodeModulesFolderExists, state);
if (result) {
return result;
}
result = loadNodeModuleFromDirectory(supportedTypeScriptExtensions, candidate, failedLookupLocations, !nodeModulesFolderExists, state);
if (result) {
return result;
}
}
const parentPath = getDirectoryPath(directory);
if (parentPath === directory) {
break;
}
directory = parentPath;
}
return undefined;
}
export function classicNameResolver(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost): ResolvedModuleWithFailedLookupLocations {
const traceEnabled = isTraceEnabled(compilerOptions, host);
const state = { compilerOptions, host, traceEnabled, skipTsx: !compilerOptions.jsx };
const failedLookupLocations: string[] = [];
const supportedExtensions = getSupportedExtensions(compilerOptions);
let containingDirectory = getDirectoryPath(containingFile);
const resolvedFileName = tryLoadModuleUsingOptionalResolutionSettings(moduleName, containingDirectory, loadModuleFromFile, failedLookupLocations, supportedExtensions, state);
if (resolvedFileName) {
return createResolvedModule(resolvedFileName, /*isExternalLibraryImport*/false, failedLookupLocations);
}
let referencedSourceFile: string;
if (moduleHasNonRelativeName(moduleName)) {
while (true) {
const searchName = normalizePath(combinePaths(containingDirectory, moduleName));
referencedSourceFile = loadModuleFromFile(searchName, supportedExtensions, failedLookupLocations, /*onlyRecordFailures*/ false, state);
if (referencedSourceFile) {
break;
}
const parentPath = getDirectoryPath(containingDirectory);
if (parentPath === containingDirectory) {
break;
}
containingDirectory = parentPath;
}
}
else {
const candidate = normalizePath(combinePaths(containingDirectory, moduleName));
referencedSourceFile = loadModuleFromFile(candidate, supportedExtensions, failedLookupLocations, /*onlyRecordFailures*/ false, state);
}
return referencedSourceFile
? { resolvedModule: { resolvedFileName: referencedSourceFile }, failedLookupLocations }
: { resolvedModule: undefined, failedLookupLocations };
}
/* @internal */
export const defaultInitCompilerOptions: CompilerOptions = {
module: ModuleKind.CommonJS,
target: ScriptTarget.ES5,
noImplicitAny: false,
sourceMap: false,
};
interface OutputFingerprint {
hash: string;
byteOrderMark: boolean;
mtime: Date;
}
export function createCompilerHost(options: CompilerOptions, setParentNodes?: boolean): CompilerHost {
const existingDirectories: Map<boolean> = {};
function getCanonicalFileName(fileName: string): string {
// if underlying system can distinguish between two files whose names differs only in cases then file name already in canonical form.
// otherwise use toLowerCase as a canonical form.
return sys.useCaseSensitiveFileNames ? fileName : fileName.toLowerCase();
}
// returned by CScript sys environment
const unsupportedFileEncodingErrorCode = -2147024809;
function getSourceFile(fileName: string, languageVersion: ScriptTarget, onError?: (message: string) => void): SourceFile {
let text: string;
try {
const start = new Date().getTime();
text = sys.readFile(fileName, options.charset);
ioReadTime += new Date().getTime() - start;
}
catch (e) {
if (onError) {
onError(e.number === unsupportedFileEncodingErrorCode
? createCompilerDiagnostic(Diagnostics.Unsupported_file_encoding).messageText
: e.message);
}
text = "";
}
return text !== undefined ? createSourceFile(fileName, text, languageVersion, setParentNodes) : undefined;
}
function directoryExists(directoryPath: string): boolean {
if (hasProperty(existingDirectories, directoryPath)) {
return true;
}
if (sys.directoryExists(directoryPath)) {
existingDirectories[directoryPath] = true;
return true;
}
return false;
}
function ensureDirectoriesExist(directoryPath: string) {
if (directoryPath.length > getRootLength(directoryPath) && !directoryExists(directoryPath)) {
const parentDirectory = getDirectoryPath(directoryPath);
ensureDirectoriesExist(parentDirectory);
sys.createDirectory(directoryPath);
}
}
let outputFingerprints: Map<OutputFingerprint>;
function writeFileIfUpdated(fileName: string, data: string, writeByteOrderMark: boolean): void {
if (!outputFingerprints) {
outputFingerprints = {};
}
const hash = sys.createHash(data);
const mtimeBefore = sys.getModifiedTime(fileName);
if (mtimeBefore && hasProperty(outputFingerprints, fileName)) {
const fingerprint = outputFingerprints[fileName];
// If output has not been changed, and the file has no external modification
if (fingerprint.byteOrderMark === writeByteOrderMark &&
fingerprint.hash === hash &&
fingerprint.mtime.getTime() === mtimeBefore.getTime()) {
return;
}
}
sys.writeFile(fileName, data, writeByteOrderMark);
const mtimeAfter = sys.getModifiedTime(fileName);
outputFingerprints[fileName] = {
hash,
byteOrderMark: writeByteOrderMark,
mtime: mtimeAfter
};
}
function writeFile(fileName: string, data: string, writeByteOrderMark: boolean, onError?: (message: string) => void) {
try {
const start = new Date().getTime();
ensureDirectoriesExist(getDirectoryPath(normalizePath(fileName)));
if (isWatchSet(options) && sys.createHash && sys.getModifiedTime) {
writeFileIfUpdated(fileName, data, writeByteOrderMark);
}
else {
sys.writeFile(fileName, data, writeByteOrderMark);
}
ioWriteTime += new Date().getTime() - start;
}
catch (e) {
if (onError) {
onError(e.message);
}
}
}
function getDefaultLibLocation(): string {
return getDirectoryPath(normalizePath(sys.getExecutingFilePath()));
}
const newLine = getNewLineCharacter(options);
return {
getSourceFile,
getDefaultLibLocation,
getDefaultLibFileName: options => combinePaths(getDefaultLibLocation(), getDefaultLibFileName(options)),
writeFile,
getCurrentDirectory: memoize(() => sys.getCurrentDirectory()),
useCaseSensitiveFileNames: () => sys.useCaseSensitiveFileNames,
getCanonicalFileName,
getNewLine: () => newLine,
fileExists: fileName => sys.fileExists(fileName),
readFile: fileName => sys.readFile(fileName),
trace: (s: string) => sys.write(s + newLine),
directoryExists: directoryName => sys.directoryExists(directoryName)
};
}
export function getPreEmitDiagnostics(program: Program, sourceFile?: SourceFile, cancellationToken?: CancellationToken): Diagnostic[] {
let diagnostics = program.getOptionsDiagnostics(cancellationToken).concat(
program.getSyntacticDiagnostics(sourceFile, cancellationToken),
program.getGlobalDiagnostics(cancellationToken),
program.getSemanticDiagnostics(sourceFile, cancellationToken));
if (program.getCompilerOptions().declaration) {
diagnostics = diagnostics.concat(program.getDeclarationDiagnostics(sourceFile, cancellationToken));
}
return sortAndDeduplicateDiagnostics(diagnostics);
}
export function flattenDiagnosticMessageText(messageText: string | DiagnosticMessageChain, newLine: string): string {
if (typeof messageText === "string") {
return messageText;
}
else {
let diagnosticChain = messageText;
let result = "";
let indent = 0;
while (diagnosticChain) {
if (indent) {
result += newLine;
for (let i = 0; i < indent; i++) {
result += " ";
}
}
result += diagnosticChain.messageText;
indent++;
diagnosticChain = diagnosticChain.next;
}
return result;
}
}
export function createProgram(rootNames: string[], options: CompilerOptions, host?: CompilerHost, oldProgram?: Program): Program {
let program: Program;
let files: SourceFile[] = [];
let fileProcessingDiagnostics = createDiagnosticCollection();
const programDiagnostics = createDiagnosticCollection();
let commonSourceDirectory: string;
let diagnosticsProducingTypeChecker: TypeChecker;
let noDiagnosticsTypeChecker: TypeChecker;
let classifiableNames: Map<string>;
let skipDefaultLib = options.noLib;
const supportedExtensions = getSupportedExtensions(options);
const start = new Date().getTime();
host = host || createCompilerHost(options);
// Map storing if there is emit blocking diagnostics for given input
const hasEmitBlockingDiagnostics = createFileMap<boolean>(getCanonicalFileName);
const currentDirectory = host.getCurrentDirectory();
const resolveModuleNamesWorker = host.resolveModuleNames
? ((moduleNames: string[], containingFile: string) => host.resolveModuleNames(moduleNames, containingFile))
: ((moduleNames: string[], containingFile: string) => {
const resolvedModuleNames: ResolvedModule[] = [];
// resolveModuleName does not store any results between calls.
// lookup is a local cache to avoid resolving the same module name several times
const lookup: Map<ResolvedModule> = {};
for (const moduleName of moduleNames) {
let resolvedName: ResolvedModule;
if (hasProperty(lookup, moduleName)) {
resolvedName = lookup[moduleName];
}
else {
resolvedName = resolveModuleName(moduleName, containingFile, options, host).resolvedModule;
lookup[moduleName] = resolvedName;
}
resolvedModuleNames.push(resolvedName);
}
return resolvedModuleNames;
});
const filesByName = createFileMap<SourceFile>();
// stores 'filename -> file association' ignoring case
// used to track cases when two file names differ only in casing
const filesByNameIgnoreCase = host.useCaseSensitiveFileNames() ? createFileMap<SourceFile>(fileName => fileName.toLowerCase()) : undefined;
if (oldProgram) {
// check properties that can affect structure of the program or module resolution strategy
// if any of these properties has changed - structure cannot be reused
const oldOptions = oldProgram.getCompilerOptions();
if ((oldOptions.module !== options.module) ||
(oldOptions.noResolve !== options.noResolve) ||
(oldOptions.target !== options.target) ||
(oldOptions.noLib !== options.noLib) ||
(oldOptions.jsx !== options.jsx) ||
(oldOptions.allowJs !== options.allowJs)) {
oldProgram = undefined;
}
}
if (!tryReuseStructureFromOldProgram()) {
forEach(rootNames, name => processRootFile(name, /*isDefaultLib*/ false));
// Do not process the default library if:
// - The '--noLib' flag is used.
// - A 'no-default-lib' reference comment is encountered in
// processing the root files.
if (!skipDefaultLib) {
// If '--lib' is not specified, include default library file according to '--target'
// otherwise, using options specified in '--lib' instead of '--target' default library file
if (!options.lib) {
processRootFile(host.getDefaultLibFileName(options), /*isDefaultLib*/ true);
}
else {
const libDirectory = host.getDefaultLibLocation ? host.getDefaultLibLocation() : getDirectoryPath(host.getDefaultLibFileName(options));
forEach(options.lib, libFileName => {
processRootFile(combinePaths(libDirectory, libFileName), /*isDefaultLib*/ true);
});
}
}
}
// unconditionally set oldProgram to undefined to prevent it from being captured in closure
oldProgram = undefined;
program = {
getRootFileNames: () => rootNames,
getSourceFile,
getSourceFiles: () => files,
getCompilerOptions: () => options,
getSyntacticDiagnostics,
getOptionsDiagnostics,
getGlobalDiagnostics,
getSemanticDiagnostics,
getDeclarationDiagnostics,
getTypeChecker,
getClassifiableNames,
getDiagnosticsProducingTypeChecker,
getCommonSourceDirectory,
emit,
getCurrentDirectory: () => currentDirectory,
getNodeCount: () => getDiagnosticsProducingTypeChecker().getNodeCount(),
getIdentifierCount: () => getDiagnosticsProducingTypeChecker().getIdentifierCount(),
getSymbolCount: () => getDiagnosticsProducingTypeChecker().getSymbolCount(),
getTypeCount: () => getDiagnosticsProducingTypeChecker().getTypeCount(),
getFileProcessingDiagnostics: () => fileProcessingDiagnostics
};
verifyCompilerOptions();
programTime += new Date().getTime() - start;
return program;
function getCommonSourceDirectory() {
if (typeof commonSourceDirectory === "undefined") {
if (options.rootDir && checkSourceFilesBelongToPath(files, options.rootDir)) {
// If a rootDir is specified and is valid use it as the commonSourceDirectory
commonSourceDirectory = getNormalizedAbsolutePath(options.rootDir, currentDirectory);
}
else {
commonSourceDirectory = computeCommonSourceDirectory(files);
}
if (commonSourceDirectory && commonSourceDirectory[commonSourceDirectory.length - 1] !== directorySeparator) {
// Make sure directory path ends with directory separator so this string can directly
// used to replace with "" to get the relative path of the source file and the relative path doesn't
// start with / making it rooted path
commonSourceDirectory += directorySeparator;
}
}
return commonSourceDirectory;
}
function getClassifiableNames() {
if (!classifiableNames) {
// Initialize a checker so that all our files are bound.
getTypeChecker();
classifiableNames = {};
for (const sourceFile of files) {
copyMap(sourceFile.classifiableNames, classifiableNames);
}
}
return classifiableNames;
}
function tryReuseStructureFromOldProgram(): boolean {
if (!oldProgram) {
return false;
}
Debug.assert(!oldProgram.structureIsReused);
// there is an old program, check if we can reuse its structure
const oldRootNames = oldProgram.getRootFileNames();
if (!arrayIsEqualTo(oldRootNames, rootNames)) {
return false;
}
// check if program source files has changed in the way that can affect structure of the program
const newSourceFiles: SourceFile[] = [];
const filePaths: Path[] = [];
const modifiedSourceFiles: SourceFile[] = [];
for (const oldSourceFile of oldProgram.getSourceFiles()) {
let newSourceFile = host.getSourceFile(oldSourceFile.fileName, options.target);
if (!newSourceFile) {
return false;
}
newSourceFile.path = oldSourceFile.path;
filePaths.push(newSourceFile.path);
if (oldSourceFile !== newSourceFile) {
if (oldSourceFile.hasNoDefaultLib !== newSourceFile.hasNoDefaultLib) {
// value of no-default-lib has changed
// this will affect if default library is injected into the list of files
return false;
}
// check tripleslash references
if (!arrayIsEqualTo(oldSourceFile.referencedFiles, newSourceFile.referencedFiles, fileReferenceIsEqualTo)) {
// tripleslash references has changed
return false;
}
// check imports and module augmentations
collectExternalModuleReferences(newSourceFile);
if (!arrayIsEqualTo(oldSourceFile.imports, newSourceFile.imports, moduleNameIsEqualTo)) {
// imports has changed
return false;
}
if (!arrayIsEqualTo(oldSourceFile.moduleAugmentations, newSourceFile.moduleAugmentations, moduleNameIsEqualTo)) {
// moduleAugmentations has changed
return false;
}
if (resolveModuleNamesWorker) {
const moduleNames = map(concatenate(newSourceFile.imports, newSourceFile.moduleAugmentations), getTextOfLiteral);
const resolutions = resolveModuleNamesWorker(moduleNames, getNormalizedAbsolutePath(newSourceFile.fileName, currentDirectory));
// ensure that module resolution results are still correct
for (let i = 0; i < moduleNames.length; i++) {
const newResolution = resolutions[i];
const oldResolution = getResolvedModule(oldSourceFile, moduleNames[i]);
const resolutionChanged = oldResolution
? !newResolution ||
oldResolution.resolvedFileName !== newResolution.resolvedFileName ||
!!oldResolution.isExternalLibraryImport !== !!newResolution.isExternalLibraryImport
: newResolution;
if (resolutionChanged) {
return false;
}
}
}
// pass the cache of module resolutions from the old source file
newSourceFile.resolvedModules = oldSourceFile.resolvedModules;
modifiedSourceFiles.push(newSourceFile);
}
else {
// file has no changes - use it as is
newSourceFile = oldSourceFile;
}
// if file has passed all checks it should be safe to reuse it
newSourceFiles.push(newSourceFile);
}
// update fileName -> file mapping
for (let i = 0, len = newSourceFiles.length; i < len; i++) {
filesByName.set(filePaths[i], newSourceFiles[i]);
}
files = newSourceFiles;
fileProcessingDiagnostics = oldProgram.getFileProcessingDiagnostics();
for (const modifiedFile of modifiedSourceFiles) {
fileProcessingDiagnostics.reattachFileDiagnostics(modifiedFile);
}
oldProgram.structureIsReused = true;
return true;
}
function getEmitHost(writeFileCallback?: WriteFileCallback): EmitHost {
return {
getCanonicalFileName,
getCommonSourceDirectory: program.getCommonSourceDirectory,
getCompilerOptions: program.getCompilerOptions,
getCurrentDirectory: () => currentDirectory,
getNewLine: () => host.getNewLine(),
getSourceFile: program.getSourceFile,
getSourceFiles: program.getSourceFiles,
writeFile: writeFileCallback || (
(fileName, data, writeByteOrderMark, onError, sourceFiles) => host.writeFile(fileName, data, writeByteOrderMark, onError, sourceFiles)),
isEmitBlocked,
};
}
function getDiagnosticsProducingTypeChecker() {
return diagnosticsProducingTypeChecker || (diagnosticsProducingTypeChecker = createTypeChecker(program, /*produceDiagnostics:*/ true));
}
function getTypeChecker() {
return noDiagnosticsTypeChecker || (noDiagnosticsTypeChecker = createTypeChecker(program, /*produceDiagnostics:*/ false));
}
function emit(sourceFile?: SourceFile, writeFileCallback?: WriteFileCallback, cancellationToken?: CancellationToken): EmitResult {
return runWithCancellationToken(() => emitWorker(this, sourceFile, writeFileCallback, cancellationToken));
}