ParserTest.java

package de.fuberlin.projecta;

import static org.junit.Assert.assertTrue;

import java.io.File;

import org.junit.Test;

import de.fuberlin.commons.lexer.ILexer;
import de.fuberlin.commons.parser.ISyntaxTree;
import de.fuberlin.projecta.lexer.Lexer;
import de.fuberlin.projecta.lexer.SyntaxErrorException;
import de.fuberlin.projecta.lexer.io.FileCharStream;
import de.fuberlin.projecta.lexer.io.ICharStream;
import de.fuberlin.projecta.lexer.io.StringCharStream;
import de.fuberlin.projecta.parser.ParseException;
import de.fuberlin.projecta.parser.Parser;

/**
 * This tests the following parts:
 * Lexer -> Parser
 * 
 * The focus here are parsing failures
 */
public class ParserTest {

	static String mainC(String block) {
		String code = "def int main() { ";
		code += block;
		code += "return 0; }";
		return code;
	}

	static ISyntaxTree parse(ICharStream stream) {
		ILexer lexer = new Lexer(stream);
		Parser parser = new Parser();
		ISyntaxTree parseTree = null;
		try {
			parseTree = parser.parse(lexer, "");
		} catch (ParseException e) {
			System.out.println(e.getDetails());
			throw e;
		}
		return parseTree;
	}

	static ISyntaxTree parse(String code) {
		ICharStream stream = new StringCharStream(code);
		return parse(stream);
	}

	@Test
	public void testReadSourceFile() {
		final String path = Config.TEST_DATA_FOLDER + "LexerTestFile2.txt";
		
		File sourceFile = new File(path);
		assertTrue(sourceFile.exists());
		assertTrue(sourceFile.canRead());
		parse(new FileCharStream(path));
	}

	@Test(expected=ParseException.class)
	public void testInvalidProgram() {
		parse("def def");
	}

	@Test(expected=SyntaxErrorException.class)
	public void testReceiveLexerException() {
		parse("0e.");
	}

	@Test
	public void testMultiExpression() {
		String code = mainC("int a; a = 1 + 2 + 3;");
		parse(code);
	}

	@Test(expected = ParseException.class)
	public void testInvalidArrayDeclaration() {
		String code = mainC("int[2.5] a;");
		parse(code);
	}

	@Test(expected = ParseException.class)
	public void testInvalidArrayDeclaration2() {
		String code = mainC("int i; int[i] a;");
		parse(code);
	}

	@Test
	public void testValidProgram() {
		parse("def int main() {}");
	}
}