Groovy example source code file (ClassicGroovyTestGeneratorHelper.java)

This example Groovy source code file (ClassicGroovyTestGeneratorHelper.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, bufferedreader, bufferedreader, compilerconfiguration, exception, groovyshell, io, object, recognitionexception, string, string, stringbuffer, stringbuffer, stringreader, stringreader, util

The Groovy ClassicGroovyTestGeneratorHelper.java source code

package org.codehaus.groovy.tck;

import java.io.Reader;
import java.io.StringReader;
import java.io.BufferedReader;
import java.io.IOException;
import java.util.ArrayList;
// Jsr parser
// @todo - refactor pulling generic parser interface up
import org.codehaus.groovy.antlr.parser.GroovyRecognizer;

// codehaus reference implementation usage
// @todo - remove classic references from the TCK
import org.codehaus.groovy.control.CompilerConfiguration;
import groovy.lang.GroovyShell;
import antlr.RecognitionException;

/** Helper methods for generated TCK test case using new JSR parser and classic groovy AST and evaluation */
public class ClassicGroovyTestGeneratorHelper implements TestGeneratorHelper {

    /** evaluate the source text against the classic AST with the JSR parser implementation*/
    public Object evaluate(String theSrcText, String testName) throws Exception {
        parse(theSrcText, testName); // fail early with a direct message if possible')
        GroovyShell groovy = new GroovyShell(new CompilerConfiguration());
        return groovy.run(theSrcText, "main", new ArrayList());
    }

    /** run the JSR parser implementation over the supplied source text*/
    public void parse(String theSrcText, String testName) throws Exception {
        System.out.println("-------------------------------");
        System.out.println("  " + testName);
        System.out.println("-------------------------------");
        try {
            Reader reader = new BufferedReader(new StringReader(theSrcText));
            GroovyRecognizer recognizer = GroovyRecognizer.make(reader);
            recognizer.compilationUnit();
            System.out.println(decorateWithLineNumbers(theSrcText));

        } catch (RecognitionException parseException) {
            System.out.println(decorateWithLineNumbersAndErrorMessage(theSrcText,parseException));
            throw parseException;
        }
        System.out.println("-------------------------------");

    }

    private String decorateWithLineNumbersAndErrorMessage(String theSrcText, RecognitionException parseException) {
        try {
            BufferedReader reader = new BufferedReader(new StringReader(theSrcText));
            String line = null;
            StringBuffer numberedSrcTextBuffer = new StringBuffer();
            int lineNum = 1;
            while ((line = reader.readLine() ) != null) {
                numberedSrcTextBuffer.append(lineNum);
                numberedSrcTextBuffer.append("\t");
                numberedSrcTextBuffer.append(line);
                numberedSrcTextBuffer.append(lineSep);

                if (parseException != null) {
                    if (lineNum == parseException.getLine()) {
                        StringBuffer padding = new StringBuffer("\t");
                        for (int col=1; col<parseException.getColumn();col++) {
                            padding.append(" ");
                        }
                        numberedSrcTextBuffer.append(padding);
                        numberedSrcTextBuffer.append("^");
                        numberedSrcTextBuffer.append(lineSep);
                        numberedSrcTextBuffer.append("ERROR:");
                        numberedSrcTextBuffer.append(lineSep);
                        numberedSrcTextBuffer.append(parseException.getMessage());
                        numberedSrcTextBuffer.append(lineSep);
                        numberedSrcTextBuffer.append(lineSep);
                    }
                }

                lineNum++;

            }
            theSrcText = numberedSrcTextBuffer.toString();
        } catch (IOException e) {
            //ignore
        }
        return theSrcText;
    }

    private String decorateWithLineNumbers(String theSrcText) {
        return decorateWithLineNumbersAndErrorMessage(theSrcText,null);
    }

    protected String lineSep = System.getProperty("line.separator");
}