Examples with LexerGrammar org.antlr.v4.tool.LexerGrammar used on opensource projects

Example 81 with LexerGrammar

use of org.antlr.v4.tool.LexerGrammar in project antlr4 by tunnelvisionlabs.

the class TestATNInterpreter method testArbitraryLeftPrefix.

@Test
public void testArbitraryLeftPrefix() throws Exception {
    LexerGrammar lg = new LexerGrammar("lexer grammar L;\n" + "A : 'a' ;\n" + "B : 'b' ;\n" + "C : 'c' ;\n");
    Grammar g = new Grammar("parser grammar T;\n" + "a : A+ B | A+ C ;");
    checkMatchedAlt(lg, g, "aac", 2);
}

Example 82 with LexerGrammar

use of org.antlr.v4.tool.LexerGrammar in project antlr4 by tunnelvisionlabs.

the class TestATNInterpreter method testAmbigAltChooseFirst.

@Test
public void testAmbigAltChooseFirst() throws Exception {
    LexerGrammar lg = new LexerGrammar("lexer grammar L;\n" + "A : 'a' ;\n" + "B : 'b' ;\n" + "C : 'c' ;\n" + "D : 'd' ;\n");
    Grammar g = new Grammar("parser grammar T;\n" + // first alt
    "a : A B | A B ;");
    checkMatchedAlt(lg, g, "ab", 1);
    checkMatchedAlt(lg, g, "abc", 1);
}

Example 83 with LexerGrammar

use of org.antlr.v4.tool.LexerGrammar in project antlr4 by tunnelvisionlabs.

the class TestATNInterpreter method testCommonLeftPrefix.

@Test
public void testCommonLeftPrefix() throws Exception {
    LexerGrammar lg = new LexerGrammar("lexer grammar L;\n" + "A : 'a' ;\n" + "B : 'b' ;\n" + "C : 'c' ;\n");
    Grammar g = new Grammar("parser grammar T;\n" + "a : A B | A C ;");
    checkMatchedAlt(lg, g, "ab", 1);
    checkMatchedAlt(lg, g, "ac", 2);
}

Example 84 with LexerGrammar

use of org.antlr.v4.tool.LexerGrammar in project antlr4 by tunnelvisionlabs.

the class TestATNInterpreter method testMustTrackPreviousGoodAlt.

@Test
public void testMustTrackPreviousGoodAlt() throws Exception {
    LexerGrammar lg = new LexerGrammar("lexer grammar L;\n" + "A : 'a' ;\n" + "B : 'b' ;\n" + "C : 'c' ;\n");
    Grammar g = new Grammar("parser grammar T;\n" + "a : A | A B ;");
    checkMatchedAlt(lg, g, "a", 1);
    checkMatchedAlt(lg, g, "ab", 2);
    checkMatchedAlt(lg, g, "ac", 1);
    checkMatchedAlt(lg, g, "abc", 2);
}

Example 85 with LexerGrammar

use of org.antlr.v4.tool.LexerGrammar in project antlr4 by tunnelvisionlabs.

the class BaseTest method createATN.

protected ATN createATN(Grammar g, boolean useSerializer) {
    if (g.atn == null) {
        semanticProcess(g);
        assertEquals(0, g.tool.getNumErrors());
        ParserATNFactory f;
        if (g.isLexer()) {
            f = new LexerATNFactory((LexerGrammar) g);
        } else {
            f = new ParserATNFactory(g);
        }
        g.atn = f.createATN();
        assertEquals(0, g.tool.getNumErrors());
    }
    ATN atn = g.atn;
    if (useSerializer) {
        char[] serialized = ATNSerializer.getSerializedAsChars(atn, Arrays.asList(g.getRuleNames()));
        return new ATNDeserializer().deserialize(serialized);
    }
    return atn;
}