@Override
public boolean isModule() {
checkErrorManager();
try {
regenerateDependencyInfoIfNecessary();
return isModuleFile;
} catch (IOException e) {
compiler
.getErrorManager()
.report(CheckLevel.ERROR, JSError.make(AbstractCompiler.READ_ERROR, getName()));
return false;
}
}
/** Gets a list of types provided by this input. */
@Override
public Collection<String> getProvides() {
checkErrorManager();
try {
regenerateDependencyInfoIfNecessary();
return Collections.unmodifiableSet(provides);
} catch (IOException e) {
compiler
.getErrorManager()
.report(CheckLevel.ERROR, JSError.make(AbstractCompiler.READ_ERROR, getName()));
return ImmutableList.of();
}
}
/** Regenerates the provides/requires if we need to do so. */
private void regenerateDependencyInfoIfNecessary() throws IOException {
// If the code is NOT a JsAst, then it was not originally JS code.
// Look at the Ast for dependency info.
if (!(ast instanceof JsAst)) {
Preconditions.checkNotNull(compiler, "Expected setCompiler to be called first");
DepsFinder finder = new DepsFinder();
Node root = getAstRoot(compiler);
if (root == null) {
return;
}
finder.visitTree(getAstRoot(compiler));
// TODO(nicksantos|user): This caching behavior is a bit
// odd, and only works if you assume the exact call flow that
// clients are currently using. In that flow, they call
// getProvides(), then remove the goog.provide calls from the
// AST, and then call getProvides() again.
//
// This won't work for any other call flow, or any sort of incremental
// compilation scheme. The API needs to be fixed so callers aren't
// doing weird things like this, and then we should get rid of the
// multiple-scan strategy.
isModuleFile = finder.isModuleFile;
provides.addAll(finder.provides);
requires.addAll(finder.requires);
} else {
// Otherwise, look at the source code.
if (!generatedDependencyInfoFromSource) {
// Note: it's OK to use getName() instead of
// getPathRelativeToClosureBase() here because we're not using
// this to generate deps files. (We're only using it for
// symbol dependencies.)
DependencyInfo info =
(new JsFileParser(compiler.getErrorManager()))
.setIncludeGoogBase(true)
.parseFile(getName(), getName(), getCode());
isModuleFile = info.isModule();
provides.addAll(info.getProvides());
requires.addAll(info.getRequires());
generatedDependencyInfoFromSource = true;
}
}
}
private void checkErrorManager() {
Preconditions.checkNotNull(compiler, "Expected setCompiler to be called first: " + this);
Preconditions.checkNotNull(
compiler.getErrorManager(), "Expected compiler to call an error manager: " + this);
}
