private static List<File> recursiveGetAllJavaSources(File file, ArrayList<File> list) {
if (file.isDirectory()) {
for (File f : file.listFiles(fileFilter)) {
recursiveGetAllJavaSources(f, list);
}
} else {
list.add(file);
}
return list;
}
@SuppressWarnings({"ConstantConditions"})
protected void run(String[] args) {
System.out.println("parboiled Java parser, performance test");
System.out.println("---------------------------------------");
System.out.print("Creating parser... :");
long start = System.currentTimeMillis();
Parboiled.createParser(JavaParser.class);
time(start);
System.out.print("Creating 100 more parser instances... :");
JavaParser parser = null;
start = System.currentTimeMillis();
for (int i = 0; i < 100; i++) {
parser = Parboiled.createParser(JavaParser.class);
}
time(start);
System.out.print("Creating 100 more parser instances using BaseParser.newInstance() ... :");
start = System.currentTimeMillis();
for (int i = 0; i < 100; i++) {
parser = parser.newInstance();
}
time(start);
start = System.currentTimeMillis();
File baseDir = args.length == 1 ? new File(args[0]) : null;
if (baseDir == null || !baseDir.exists()) baseDir = new File(".");
System.out.printf("Retrieving file list from '%s'", baseDir);
List<File> sources = recursiveGetAllJavaSources(baseDir, new ArrayList<File>());
time(start);
System.out.printf("Parsing all %s given java sources", sources.size());
Rule rootRule =
parser.CompilationUnit().suppressNode(); // we want to see the parse-tree-less performance
start = System.currentTimeMillis();
long lines = 0, characters = 0;
for (File sourceFile : sources) {
long dontCountStart = System.currentTimeMillis();
String sourceText = readAllText(sourceFile);
start +=
System.currentTimeMillis()
- dontCountStart; // do not count the time for reading the text file
ParsingResult<?> result = null;
try {
result = run(rootRule, sourceText);
} catch (Exception e) {
System.out.printf("\nException while parsing file '%s':\n%s", sourceFile, e);
System.exit(1);
}
if (!result.matched) {
System.out.printf(
"\nParse error(s) in file '%s':\n%s", sourceFile, printParseErrors(result));
System.exit(1);
} else {
System.out.print('.');
}
lines += result.inputBuffer.getLineCount();
characters += sourceText.length();
}
long time = time(start);
System.out.println("Parsing performance:");
System.out.printf(
" %6d Files -> %6.2f Files/sec\n", sources.size(), sources.size() * 1000.0 / time);
System.out.printf(" %6d Lines -> %6d Lines/sec\n", lines, lines * 1000 / time);
System.out.printf(" %6d Chars -> %6d Chars/sec\n", characters, characters * 1000 / time);
}
public boolean accept(File file) {
return file.isDirectory() || file.getName().endsWith(".java");
}