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Adding comments and a missing undefined check

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This commit is contained in:
Anders Hejlsberg
2015-01-19 16:41:33 -08:00
parent a2ecaf60f0
commit 1aa67b7fc4
1 changed files with 9 additions and 5 deletions
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14
src/compiler/tsc.ts
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@@ -6,7 +6,6 @@ module ts {
export interface SourceFile {
fileWatcher: FileWatcher;
fileChanged: boolean;
}
/**
@@ -262,18 +261,20 @@ module ts {
// Use default host function
var sourceFile = hostGetSourceFile(filename, languageVersion, onError);
// Cache the source file in -watch mode
if (commandLine.options.watch) {
if (sourceFile && commandLine.options.watch) {
cacheSourceFile(sourceFile);
}
return sourceFile;
}
// Cache the given source file and watch for changes
function cacheSourceFile(sourceFile: SourceFile) {
cachedSourceFiles = cachedSourceFiles || {};
cachedSourceFiles[compilerHost.getCanonicalFileName(sourceFile.filename)] = sourceFile;
sourceFile.fileWatcher = sys.watchFile(sourceFile.filename, sourceFileChanged);
}
// Remove the given source file from the cache
function forgetSourceFile(sourceFile: SourceFile) {
if (sourceFile.fileWatcher) {
sourceFile.fileWatcher.close();
@@ -282,6 +283,7 @@ module ts {
}
}
// Update the cache to contain only source files in the given list
function updateSourceFileCache(keepSourceFiles: SourceFile[]) {
for (var filename in cachedSourceFiles) {
var sourceFile = cachedSourceFiles[filename];
@@ -293,6 +295,7 @@ module ts {
}
}
// Remove all source files from the cache
function clearSourceFileCache() {
if (cachedSourceFiles) {
for (var filename in cachedSourceFiles) {
@@ -305,6 +308,7 @@ module ts {
cachedSourceFiles = undefined;
}
// If a source file changes, remove that file from the cache and start the recompilation timer
function sourceFileChanged(filename: string) {
var sourceFile = cachedSourceFiles[filename];
if (sourceFile) {
@@ -313,14 +317,14 @@ module ts {
}
}
// If the configuration file changes, clear the cache and start the recompilation timer
function configFileChanged() {
clearSourceFileCache();
startTimer();
}
// Upon detecting a file change, queue up file modification events for the next 250ms and then
// perform a recompilation. The reasoning is that in some cases an editor can save all files at once,
// and we'd like to just perform a single recompilation.
// Upon detecting a file change, wait for the 250ms and then perform a recompilation. The reasoning is that
// in some cases an editor can save all files at once, and we'd like to just perform a single recompilation.
function startTimer() {
if (timerHandle) {
clearTimeout(timerHandle);