public Token nextToken() {
final Token token = tokenizer.nextToken();
if (token == null) {
return token;
}
if (!token.hasTag(AreaTag.PROGRAM_TEXT_AREA)) {
return token;
}
final String text = token.getText();
if (text == null) {
return token;
}
if (PATTERN.matcher(text).matches()) {
if (LOGGER.isTraceEnabled()) {
LOGGER.trace("Marking " + token + " as a source formatting directive.");
}
token.removeTag(AreaTag.PROGRAM_TEXT_AREA);
// token.addTag(AreaTag.COMMENT);
token.addTag(AreaTag.SOURCE_FORMATTING_DIRECTIVE);
}
return token;
}
public void quit() {
tokenizer.quit();
}
public static List<Token> process(String filename, SourceFormat format) throws IOException {
System.out.println("Tokenizing " + filename);
FileReader reader = new FileReader(filename);
// We will be building up our tokenizer in several stages. Each stage
// takes the preceding tokenizer, and extends its abilities.
Tokenizer tokenizer;
// The tokenizers in this sequence should generate the expected tokens.
tokenizer = new LineSplittingTokenizer(new BufferedReader(reader));
tokenizer = new CompilerDirectivesTokenizer(tokenizer, format);
tokenizer = new ProgramAreaTokenizer(tokenizer, format);
tokenizer = new SourceFormattingDirectivesFilter(tokenizer);
if (format == SourceFormat.FIXED) {
tokenizer = new LineContinuationTokenizer(tokenizer);
tokenizer = new ContinuationWeldingTokenizer(tokenizer);
}
tokenizer = new SeparatorTokenizer(tokenizer);
tokenizer = new PseudoLiteralTokenizer(tokenizer);
// This tokenizer partly tests that assumption by comparing the number
// of tokens in the program text area on each line with the expected
// number. The number of expected tokens is encoded in the indicator
// area of the test file. If it is missing (which is allowed) the line
// is not tested in this way.
TokenCountVerifiyingTokenizer countVerifier = null;
tokenizer = countVerifier = new TokenCountVerifiyingTokenizer(tokenizer);
// This tokenizer tests the tagging of tokens, making sure that they are
// in a consistent state.
TokenStateVerifiyingTokenizer stateVerifier = null;
tokenizer = stateVerifier = new TokenStateVerifiyingTokenizer(tokenizer);
// Here we filter out all tokens which are not part of the program text
// area (comments are not considered part of this area). This leaves us
// with the pure code, which should be perfect for processing by a
// parser.
tokenizer = new FilteringTokenizer(tokenizer, AreaTag.PROGRAM_TEXT_AREA);
// Here we filter out all pure whitespace separators. This leaves us
// with only the "structural" tokens which are of interest to a parser.
tokenizer =
new FilteringTokenizer(
tokenizer,
new TokenFilter() {
public boolean accepts(Token token) {
return !token.hasTag(SyntacticTag.SEPARATOR) || !token.getText().trim().equals("");
}
});
// The following is handy in debugging:
// tokenizer = new PrintingTokenizer(tokenizer, System.out);
// So far, no tokenization will have occurred. The file will only start
// getting tokenized when we start asking for tokens. We do this in the
// following loop, which also counts the number of tokens which are
// returned at the end.
List<Token> tokens = new ArrayList<Token>();
Token nextToken = null;
while ((nextToken = tokenizer.nextToken()) != null) {
tokens.add(nextToken);
// System.out.println(nextToken);
}
// Some of our tokenizers may be threaded. We need to make sure that any
// threads they hold get stopped. This is what we do here. The message
// will get passed along the chain of tokenizers, giving each a chance
// to stop running.
tokenizer.quit();
// Finally, some reporting on the results of the tokenizing.
System.out.println("Processed " + tokens.size() + " top level token(s).");
if (countVerifier != null) {
for (String message : countVerifier.getErrorMessages()) {
System.out.println(message);
}
}
if (stateVerifier != null) {
for (String message : stateVerifier.getErrorMessages()) {
System.out.println(message);
}
}
System.out.println();
Assert.assertTrue(
"Counts as defined in source should match.", countVerifier.getErrorMessages().size() == 0);
Assert.assertTrue(
"Token states should be as expected.", countVerifier.getErrorMessages().size() == 0);
return tokens;
}
