Examples with PdlLexer com.linkedin.data.grammar.PdlLexer used on opensource projects

Example 1 with PdlLexer

use of com.linkedin.data.grammar.PdlLexer in project rest.li by linkedin.

the class PdlSchemaParser method parse.

/**
   * Parse a JSON representation of a schema from a {{java.io.Reader}}.
   *
   * The top level {{DataSchema}}'s parsed are in {{#topLevelDataSchemas}}.
   * These are the types that are not defined within other types.
   * Parse errors are in {{#errorMessageBuilder}} and indicated
   * by {{#hasError()}}.
   *
   * @param reader with the JSON representation of the schema.
   */
public void parse(Reader reader) {
    try {
        ErrorRecorder errorRecorder = new ErrorRecorder();
        PdlLexer lexer;
        try {
            lexer = new PdlLexer(new ANTLRInputStream(reader));
        } catch (IOException e) {
            ParseError error = new ParseError(new ParseErrorLocation(0, 0), e.getMessage());
            startErrorMessage(error).append(error.message).append(NEWLINE);
            return;
        }
        lexer.removeErrorListeners();
        lexer.addErrorListener(errorRecorder);
        PdlParser parser = new PdlParser(new CommonTokenStream(lexer));
        parser.removeErrorListeners();
        parser.addErrorListener(errorRecorder);
        DocumentContext antlrDocument = parser.document();
        parse(antlrDocument);
        if (errorRecorder.errors.size() > 0) {
            for (ParseError error : errorRecorder.errors) {
                startErrorMessage(error).append(error.message).append(NEWLINE);
            }
        }
    } catch (ParseException e) {
        startErrorMessage(e.error).append(e.getMessage()).append(NEWLINE);
    } catch (Throwable t) {
        ParseError parseError = new ParseError(new ParseErrorLocation(0, 0), null);
        startErrorMessage(parseError).append("Unexpected parser error: ").append(ExceptionUtils.getStackTrace(t)).append(NEWLINE);
    }
}