omakase.printtree.Program.java Source code

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Here is the source code for omakase.printtree.Program.java

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// Copyright 2011 Peter Hallam
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package omakase.printtree;

import com.google.common.collect.ImmutableList;
import com.google.common.io.Files;
import omakase.syntax.Parser;
import omakase.syntax.Scanner;
import omakase.syntax.tokens.Token;
import omakase.syntax.trees.ParseTree;
import omakase.util.ConsoleErrorReporter;
import omakase.util.SourceFile;

import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;

/**
 * Reads a file, tokenizes it and prints the resulting tokens one per line.
 */
public class Program {
    public static void main(String[] args) {
        if (args.length == 0) {
            System.err.println("Missing filename argument.");
            return;
        }

        final String filename = args[0];
        String source;
        try {
            source = Files.toString(new File(filename), Charset.defaultCharset());
        } catch (IOException e) {
            System.err.format("Error '%s' attempting to open file '%s'.\n", e.toString(), filename);
            source = null;
        }
        if (source == null) {
            return;
        }

        SourceFile file = new SourceFile(filename, source);
        if (!ConsoleErrorReporter.reporter.hadError()) {
            ParseTree tree = Parser.parse(ConsoleErrorReporter.reporter, file);
            ParseTreeWriter writer = new ParseTreeWriter(System.out);
            writer.visitAny(tree);
        }
    }
}