Examples with ATN org.antlr.v4.runtime.atn.ATN used on opensource projects

Example 51 with ATN

use of org.antlr.v4.runtime.atn.ATN in project antlr4 by antlr.

the class BasePythonTest 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);
        return new ATNDeserializer().deserialize(serialized);
    }
    return atn;
}

Example 52 with ATN

use of org.antlr.v4.runtime.atn.ATN in project antlr4 by antlr.

the class BasePythonTest method checkRuleDFA.

List<ANTLRMessage> checkRuleDFA(String gtext, String ruleName, String expecting) throws Exception {
    ErrorQueue equeue = new ErrorQueue();
    Grammar g = new Grammar(gtext, equeue);
    ATN atn = createATN(g, false);
    ATNState s = atn.ruleToStartState[g.getRule(ruleName).index];
    if (s == null) {
        System.err.println("no such rule: " + ruleName);
        return null;
    }
    ATNState t = s.transition(0).target;
    if (!(t instanceof DecisionState)) {
        System.out.println(ruleName + " has no decision");
        return null;
    }
    DecisionState blk = (DecisionState) t;
    checkRuleDFA(g, blk, expecting);
    return equeue.all;
}

Example 53 with ATN

use of org.antlr.v4.runtime.atn.ATN in project antlr4 by antlr.

the class BasePythonTest method checkRuleDFA.

List<ANTLRMessage> checkRuleDFA(String gtext, int decision, String expecting) throws Exception {
    ErrorQueue equeue = new ErrorQueue();
    Grammar g = new Grammar(gtext, equeue);
    ATN atn = createATN(g, false);
    DecisionState blk = atn.decisionToState.get(decision);
    checkRuleDFA(g, blk, expecting);
    return equeue.all;
}

Example 54 with ATN

use of org.antlr.v4.runtime.atn.ATN in project antlr4 by antlr.

the class TestExpectedTokens method testOptionalSubrule.

@Test
public void testOptionalSubrule() throws Exception {
    String gtext = "parser grammar T;\n" + "a : A B? C ;\n";
    Grammar g = new Grammar(gtext);
    String atnText = "RuleStart_a_0->s2\n" + "s2-A->BlockStart_4\n" + "BlockStart_4->s3\n" + "BlockStart_4->BlockEnd_5\n" + "s3-B->BlockEnd_5\n" + "BlockEnd_5->s6\n" + "s6-C->s7\n" + "s7->RuleStop_a_1\n" + "RuleStop_a_1-EOF->s8\n";
    checkRuleATN(g, "a", atnText);
    ATN atn = g.getATN();
    int blkStartStateNumber = 4;
    IntervalSet tokens = atn.getExpectedTokens(blkStartStateNumber, null);
    assertEquals("{B, C}", tokens.toString(g.getTokenNames()));
}

Example 55 with ATN

use of org.antlr.v4.runtime.atn.ATN in project antlr4 by antlr.

the class TestExpectedTokens method testEpsilonAltSubrule.

@Test
public void testEpsilonAltSubrule() throws Exception {
    String gtext = "parser grammar T;\n" + "a : A (B | ) C ;\n";
    Grammar g = new Grammar(gtext);
    String atnText = "RuleStart_a_0->s2\n" + "s2-A->BlockStart_5\n" + "BlockStart_5->s3\n" + "BlockStart_5->s4\n" + "s3-B->BlockEnd_6\n" + "s4->BlockEnd_6\n" + "BlockEnd_6->s7\n" + "s7-C->s8\n" + "s8->RuleStop_a_1\n" + "RuleStop_a_1-EOF->s9\n";
    checkRuleATN(g, "a", atnText);
    ATN atn = g.getATN();
    int blkStartStateNumber = 5;
    IntervalSet tokens = atn.getExpectedTokens(blkStartStateNumber, null);
    assertEquals("{B, C}", tokens.toString(g.getTokenNames()));
}