Groovy example source code file (GroovySourceAST.java)

This example Groovy source code file (GroovySourceAST.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Groovy tags/keywords

arraylist, ast, ast, commonast, comparable, groovysourceast, groovysourceast, indexoutofboundsexception, list, list, sourceinfo, sourceinfo, string, util

The Groovy GroovySourceAST.java source code

/*
 * Copyright 2003-2007 the original author or authors.
 *
 * 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 org.codehaus.groovy.antlr;

import antlr.CommonAST;
import antlr.Token;
import antlr.collections.AST;

import java.util.ArrayList;
import java.util.List;

/**
 * We have an AST subclass so we can track source information.
 * Very odd that ANTLR doesn't do this by default.
 *
 * @author Mike Spille
 * @author Jeremy Rayner <groovy@ross-rayner.com>
 */
public class GroovySourceAST extends CommonAST implements Comparable, SourceInfo {
    private int line;
    private int col;
    private int lineLast;
    private int colLast;
    private String snippet;

    public GroovySourceAST() {
    }

    public GroovySourceAST(Token t) {
        super(t);
    }

    public void initialize(AST ast) {
        super.initialize(ast);
        line = ast.getLine();
        col = ast.getColumn();
        if (ast instanceof GroovySourceAST) {
            GroovySourceAST node = (GroovySourceAST)ast;
            lineLast = node.getLineLast();
            colLast = node.getColumnLast();
        }
    }

    public void initialize(Token t) {
        super.initialize(t);
        line = t.getLine();
        col = t.getColumn();
        if (t instanceof SourceInfo) {
            SourceInfo info = (SourceInfo) t;
            lineLast = info.getLineLast();
            colLast  = info.getColumnLast(); 
        }
    }

    public void setLast(Token last) {
        lineLast = last.getLine();
        colLast = last.getColumn();
    }

    public int getLineLast() {
        return lineLast;
    }

    public void setLineLast(int lineLast) {
        this.lineLast = lineLast;
    }

    public int getColumnLast() {
        return colLast;
    }

    public void setColumnLast(int colLast) {
        this.colLast = colLast;
    }

    public void setLine(int line) {
        this.line = line;
    }

    public int getLine() {
        return (line);
    }

    public void setColumn(int column) {
        this.col = column;
    }

    public int getColumn() {
        return (col);
    }

    public void setSnippet(String snippet) {
        this.snippet = snippet;
    }

    public String getSnippet() {
        return snippet;
    }

    public int compareTo(Object object) {
        if (object == null) {
            return 0;
        }
        if (!(object instanceof AST)) {
            return 0;
        }
        AST that = (AST) object;

        // todo - possibly check for line/col with values of 0 or less...

        if (this.getLine() < that.getLine()) {
            return -1;
        }
        if (this.getLine() > that.getLine()) {
            return 1;
        }

        if (this.getColumn() < that.getColumn()) {
            return -1;
        }
        if (this.getColumn() > that.getColumn()) {
            return 1;
        }

        return 0;
    }

    public GroovySourceAST childAt(int position) {
        List list = new ArrayList();
        AST child = this.getFirstChild();
        while (child != null) {
            list.add(child);
            child = child.getNextSibling();
        }
        try {
            return (GroovySourceAST)list.get(position);
        } catch (IndexOutOfBoundsException e) {
            return null;
        }
    }

    public GroovySourceAST childOfType(int type) {
        AST child = this.getFirstChild();
        while (child != null) {
            if (child.getType() == type) { return (GroovySourceAST)child; }
            child = child.getNextSibling();
        }
        return null;
    }

    public List<GroovySourceAST> childrenOfType(int type) {
        List<GroovySourceAST> result = new ArrayList();
        AST child = this.getFirstChild();
        while (child != null) {
            if (child.getType() == type) { result.add((GroovySourceAST) child); }
            child = child.getNextSibling();
        }
        return result;
    }

}