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Cache unsuccessful file lookups for improved performance.

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This commit is contained in:
Anders Hejlsberg
2014-09-04 10:17:39 -07:00
parent a611ef40a8
commit f62bbc238d
1 changed files with 7 additions and 9 deletions
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16
src/compiler/parser.ts
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@@ -3691,23 +3691,22 @@ module ts {
// Get source file from normalized filename
function findSourceFile(filename: string, isDefaultLib: boolean, refFile?: SourceFile, refStart?: number, refLength?: number): SourceFile {
// Look through existing source files to see if we've encountered it.
var canonicalName = host.getCanonicalFileName(filename);
var file = getSourceFile(filename);
if (file) {
if (host.useCaseSensitiveFileNames() && canonicalName !== file.filename) {
if (hasProperty(filesByName, canonicalName)) {
// We've already looked for this file, use cached result
var file = filesByName[canonicalName];
if (file && host.useCaseSensitiveFileNames() && canonicalName !== file.filename) {
errors.push(createFileDiagnostic(refFile, refStart, refLength,
Diagnostics.Filename_0_differs_from_already_included_filename_1_only_in_casing, filename, file.filename));
}
}
}
else {
// If we haven't, read the file.
file = host.getSourceFile(filename, options.target, hostErrorMessage => {
// We haven't looked for this file, do so now and cache result
var file = filesByName[canonicalName] = host.getSourceFile(filename, options.target, hostErrorMessage => {
errors.push(createFileDiagnostic(refFile, refStart, refLength,
Diagnostics.Cannot_read_file_0_Colon_1, filename, hostErrorMessage));
});
if (file) {
filesByName[host.getCanonicalFileName(filename)] = file;
seenNoDefaultLib = seenNoDefaultLib || file.hasNoDefaultLib;
if (!options.noResolve) {
var basePath = getDirectoryPath(filename);
@@ -3725,7 +3724,6 @@ module ts {
});
}
}
return file;
}