jFuzzyLogic/antlr_3_1_source/test/TestLexer.java

/*
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 Copyright (c) 2005-2006 Terence Parr
 All rights reserved.

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 1. Redistributions of source code must retain the above copyright
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    documentation and/or other materials provided with the distribution.
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    derived from this software without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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*/
package org.antlr.test;

public class TestLexer extends BaseTest {
	protected boolean debug = false;

	/** Public default constructor used by TestRig */
	public TestLexer() {
	}

	public void testSetText() throws Exception {
		// this must return A not I to the parser; calling a nonfragment rule
		// from a nonfragment rule does not set the overall token.
		String grammar =
			"grammar P;\n"+
			"a : A {System.out.println(input);} ;\n"+
			"A : '\\\\' 't' {setText(\"\t\");} ;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;";
		String found = execParser("P.g", grammar, "PParser", "PLexer",
				    "a", "\\t", debug);
		assertEquals("\t\n", found);
	}

	public void testRefToRuleDoesNotSetTokenNorEmitAnother() throws Exception {
		// this must return A not I to the parser; calling a nonfragment rule
		// from a nonfragment rule does not set the overall token.
		String grammar =
			"grammar P;\n"+
			"a : A EOF {System.out.println(input);} ;\n"+
			"A : '-' I ;\n" +
			"I : '0'..'9'+ ;\n"+
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;";
		String found = execParser("P.g", grammar, "PParser", "PLexer",
				    "a", "-34", debug);
		assertEquals("-34\n", found);
	}

	public void testRefToRuleDoesNotSetChannel() throws Exception {
		// this must set channel of A to HIDDEN.  $channel is local to rule
		// like $type.
		String grammar =
			"grammar P;\n"+
			"a : A EOF {System.out.println($A.text+\", channel=\"+$A.channel);} ;\n"+
			"A : '-' WS I ;\n" +
			"I : '0'..'9'+ ;\n"+
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;";
		String found = execParser("P.g", grammar, "PParser", "PLexer",
				    "a", "- 34", debug);
		assertEquals("- 34, channel=0\n", found);
	}

	public void testWeCanSetType() throws Exception {
		String grammar =
			"grammar P;\n"+
			"tokens {X;}\n" +
			"a : X EOF {System.out.println(input);} ;\n"+
			"A : '-' I {$type = X;} ;\n" +
			"I : '0'..'9'+ ;\n"+
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;";
		String found = execParser("P.g", grammar, "PParser", "PLexer",
				    "a", "-34", debug);
		assertEquals("-34\n", found);
	}

	public void testRefToFragment() throws Exception {
		// this must return A not I to the parser; calling a nonfragment rule
		// from a nonfragment rule does not set the overall token.
		String grammar =
			"grammar P;\n"+
			"a : A {System.out.println(input);} ;\n"+
			"A : '-' I ;\n" +
			"fragment I : '0'..'9'+ ;\n"+
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;";
		String found = execParser("P.g", grammar, "PParser", "PLexer",
				    "a", "-34", debug);
		assertEquals("-34\n", found);
	}

	public void testMultipleRefToFragment() throws Exception {
		// this must return A not I to the parser; calling a nonfragment rule
		// from a nonfragment rule does not set the overall token.
		String grammar =
			"grammar P;\n"+
			"a : A EOF {System.out.println(input);} ;\n"+
			"A : I '.' I ;\n" +
			"fragment I : '0'..'9'+ ;\n"+
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;";
		String found = execParser("P.g", grammar, "PParser", "PLexer",
				    "a", "3.14159", debug);
		assertEquals("3.14159\n", found);
	}

	public void testLabelInSubrule() throws Exception {
		// can we see v outside?
		String grammar =
			"grammar P;\n"+
			"a : A EOF ;\n"+
			"A : 'hi' WS (v=I)? {$channel=0; System.out.println($v.text);} ;\n" +
			"fragment I : '0'..'9'+ ;\n"+
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;";
		String found = execParser("P.g", grammar, "PParser", "PLexer",
				    "a", "hi 342", debug);
		assertEquals("342\n", found);
	}

	public void testRefToTokenInLexer() throws Exception {
		String grammar =
			"grammar P;\n"+
			"a : A EOF ;\n"+
			"A : I {System.out.println($I.text);} ;\n" +
			"fragment I : '0'..'9'+ ;\n"+
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;";
		String found = execParser("P.g", grammar, "PParser", "PLexer",
				    "a", "342", debug);
		assertEquals("342\n", found);
	}

	public void testListLabelInLexer() throws Exception {
		String grammar =
			"grammar P;\n"+
			"a : A ;\n"+
			"A : i+=I+ {for (Object t : $i) System.out.print(\" \"+((Token)t).getText());} ;\n" +
			"fragment I : '0'..'9'+ ;\n"+
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;";
		String found = execParser("P.g", grammar, "PParser", "PLexer",
				    "a", "33 297", debug);
		assertEquals(" 33 297\n", found);
	}

	public void testDupListRefInLexer() throws Exception {
		String grammar =
			"grammar P;\n"+
			"a : A ;\n"+
			"A : i+=I WS i+=I {$channel=0; for (Object t : $i) System.out.print(\" \"+((Token)t).getText());} ;\n" +
			"fragment I : '0'..'9'+ ;\n"+
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;";
		String found = execParser("P.g", grammar, "PParser", "PLexer",
				    "a", "33 297", debug);
		assertEquals(" 33 297\n", found);
	}

	public void testCharLabelInLexer() {
		String grammar =
			"grammar T;\n" +
			"a : B ;\n" +
			"B : x='a' {System.out.println((char)$x);} ;\n" ;
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "a", debug);
		assertEquals("a\n", found);
	}

	public void testRepeatedLabelInLexer() {
		String grammar =
			"lexer grammar t;\n" +
			"B : x='a' x='b' ;\n" ;
		boolean found =
			rawGenerateAndBuildRecognizer(
				"t.g", grammar, null, "tLexer", false);
		boolean expecting = true; // should be ok
		assertEquals(expecting, found);
	}

	public void testRepeatedRuleLabelInLexer() {
		String grammar =
			"lexer grammar t;\n" +
			"B : x=A x=A ;\n" +
			"fragment A : 'a' ;\n" ;
		boolean found =
			rawGenerateAndBuildRecognizer(
				"t.g", grammar, null, "tLexer", false);
		boolean expecting = true; // should be ok
		assertEquals(expecting, found);
	}

	public void testIsolatedEOTEdge() {
		String grammar =
			"lexer grammar T;\n" +
			"QUOTED_CONTENT \n" +
			"        : 'q' (~'q')* (('x' 'q') )* 'q' ; \n";
		boolean found =
			rawGenerateAndBuildRecognizer(
				"T.g", grammar, null, "TLexer", false);
		boolean expecting = true; // should be ok
		assertEquals(expecting, found);
	}	

	public void testEscapedLiterals() {
		/* Grammar:
			A : '\"' ;  should match a single double-quote: "
			B : '\\\"' ; should match input \"
		*/
		String grammar =
			"lexer grammar T;\n" +
			"A : '\\\"' ;\n" +
			"B : '\\\\\\\"' ;\n" ; // '\\\"'
		boolean found =
			rawGenerateAndBuildRecognizer(
				"T.g", grammar, null, "TLexer", false);
		boolean expecting = true; // should be ok
		assertEquals(expecting, found);
	}
}