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Example 81 with Grammar

use of org.antlr.v4.tool.Grammar in project antlr4 by antlr.

the class TestATNInterpreter method testAmbigAltChooseFirst2WithEOF.

@Test(expected = NoViableAltException.class)
public void testAmbigAltChooseFirst2WithEOF() 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" + "a : (A B | A B | A B C) EOF;");
    checkMatchedAlt(lg, g, "ab", 1);
    checkMatchedAlt(lg, g, "abc", 3);
    try {
        checkMatchedAlt(lg, g, "abd", 1);
    } catch (NoViableAltException re) {
        assertEquals(2, re.getOffendingToken().getTokenIndex());
        assertEquals(4, re.getOffendingToken().getType());
        throw re;
    }
}
Also used : NoViableAltException(org.antlr.v4.runtime.NoViableAltException) Grammar(org.antlr.v4.tool.Grammar) LexerGrammar(org.antlr.v4.tool.LexerGrammar) LexerGrammar(org.antlr.v4.tool.LexerGrammar) Test(org.junit.Test)

Example 82 with Grammar

use of org.antlr.v4.tool.Grammar in project antlr4 by antlr.

the class TestATNParserPrediction method testPEGAchillesHeel.

@Test
public void testPEGAchillesHeel() 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 ;");
    checkPredictedAlt(lg, g, 0, "a", 1);
    checkPredictedAlt(lg, g, 0, "ab", 2);
    checkPredictedAlt(lg, g, 0, "abc", 2);
    String[] inputs = { "a", "ab", "abc" };
    String[] dfa = { "s0-'a'->s1\n" + "s1-EOF->:s2=>1\n", "s0-'a'->s1\n" + "s1-EOF->:s2=>1\n" + "s1-'b'->:s3=>2\n", "s0-'a'->s1\n" + "s1-EOF->:s2=>1\n" + "s1-'b'->:s3=>2\n" };
    checkDFAConstruction(lg, g, 0, inputs, dfa);
}
Also used : Grammar(org.antlr.v4.tool.Grammar) LexerGrammar(org.antlr.v4.tool.LexerGrammar) LexerGrammar(org.antlr.v4.tool.LexerGrammar) Test(org.junit.Test)

Example 83 with Grammar

use of org.antlr.v4.tool.Grammar in project antlr4 by antlr.

the class TestATNParserPrediction method testAltsForLRRuleComputation3.

@Test
public void testAltsForLRRuleComputation3() throws Exception {
    Grammar g = new Grammar("grammar T;\n" + // should have no effect
    "random : 'blort';\n" + "e : '--' e\n" + "  | e '*' e\n" + "  | e '+' e\n" + "  | e '--'\n" + "  | ID\n" + "  ;\n" + "ID : [a-z]+ ;\n" + "INT : [0-9]+ ;\n" + "WS : [ \\r\\t\\n]+ ;");
    Rule e = g.getRule("e");
    assertTrue(e instanceof LeftRecursiveRule);
    LeftRecursiveRule lr = (LeftRecursiveRule) e;
    assertEquals("[0, 1, 5]", Arrays.toString(lr.getPrimaryAlts()));
    assertEquals("[0, 2, 3, 4]", Arrays.toString(lr.getRecursiveOpAlts()));
}
Also used : LeftRecursiveRule(org.antlr.v4.tool.LeftRecursiveRule) Grammar(org.antlr.v4.tool.Grammar) LexerGrammar(org.antlr.v4.tool.LexerGrammar) Rule(org.antlr.v4.tool.Rule) LeftRecursiveRule(org.antlr.v4.tool.LeftRecursiveRule) Test(org.junit.Test)

Example 84 with Grammar

use of org.antlr.v4.tool.Grammar in project antlr4 by antlr.

the class TestATNSerialization method testLexerAction.

@Test
public void testLexerAction() throws Exception {
    LexerGrammar lg = new LexerGrammar("lexer grammar L;\n" + "A : 'a' {a} ;\n" + "B : 'b' ;\n" + "C : 'c' {c} ;\n");
    String expecting = "max type 3\n" + "0:TOKEN_START -1\n" + "1:RULE_START 0\n" + "2:RULE_STOP 0\n" + "3:RULE_START 1\n" + "4:RULE_STOP 1\n" + "5:RULE_START 2\n" + "6:RULE_STOP 2\n" + "7:BASIC 0\n" + "8:BASIC 0\n" + "9:BASIC 0\n" + "10:BASIC 1\n" + "11:BASIC 1\n" + "12:BASIC 2\n" + "13:BASIC 2\n" + "14:BASIC 2\n" + "rule 0:1 1\n" + "rule 1:3 2\n" + "rule 2:5 3\n" + "mode 0:0\n" + "0->1 EPSILON 0,0,0\n" + "0->3 EPSILON 0,0,0\n" + "0->5 EPSILON 0,0,0\n" + "1->7 EPSILON 0,0,0\n" + "3->10 EPSILON 0,0,0\n" + "5->12 EPSILON 0,0,0\n" + "7->8 ATOM 97,0,0\n" + "8->9 ACTION 0,0,0\n" + "9->2 EPSILON 0,0,0\n" + "10->11 ATOM 98,0,0\n" + "11->4 EPSILON 0,0,0\n" + "12->13 ATOM 99,0,0\n" + "13->14 ACTION 2,1,0\n" + "14->6 EPSILON 0,0,0\n" + "0:0\n";
    ATN atn = createATN(lg, true);
    String result = ATNSerializer.getDecoded(atn, Arrays.asList(lg.getTokenNames()));
    assertEquals(expecting, result);
}
Also used : ATN(org.antlr.v4.runtime.atn.ATN) LexerGrammar(org.antlr.v4.tool.LexerGrammar) Test(org.junit.Test)

Example 85 with Grammar

use of org.antlr.v4.tool.Grammar in project antlr4 by antlr.

the class TestATNSerialization method testLexerNotSetWithRange2.

@Test
public void testLexerNotSetWithRange2() throws Exception {
    LexerGrammar lg = new LexerGrammar("lexer grammar L;\n" + "ID : ~('a'|'b') ~('e'|'p'..'t')\n ;");
    String expecting = "max type 1\n" + "0:TOKEN_START -1\n" + "1:RULE_START 0\n" + "2:RULE_STOP 0\n" + "3:BASIC 0\n" + "4:BASIC 0\n" + "5:BASIC 0\n" + "rule 0:1 1\n" + "mode 0:0\n" + "0:'a'..'b'\n" + "1:'e'..'e', 'p'..'t'\n" + "0->1 EPSILON 0,0,0\n" + "1->3 EPSILON 0,0,0\n" + "3->4 NOT_SET 0,0,0\n" + "4->5 NOT_SET 1,0,0\n" + "5->2 EPSILON 0,0,0\n" + "0:0\n";
    ATN atn = createATN(lg, true);
    String result = ATNSerializer.getDecoded(atn, Arrays.asList(lg.getTokenNames()));
    assertEquals(expecting, result);
}
Also used : ATN(org.antlr.v4.runtime.atn.ATN) LexerGrammar(org.antlr.v4.tool.LexerGrammar) Test(org.junit.Test)

Aggregations

LexerGrammar (org.antlr.v4.tool.LexerGrammar)305 Test (org.junit.Test)304 Grammar (org.antlr.v4.tool.Grammar)183 ATN (org.antlr.v4.runtime.atn.ATN)65 LexerInterpreter (org.antlr.v4.runtime.LexerInterpreter)62 ANTLRInputStream (org.antlr.v4.runtime.ANTLRInputStream)59 CommonTokenStream (org.antlr.v4.runtime.CommonTokenStream)53 BaseJavaTest (org.antlr.v4.test.runtime.java.BaseJavaTest)47 TokenStreamRewriter (org.antlr.v4.runtime.TokenStreamRewriter)43 GrammarAST (org.antlr.v4.tool.ast.GrammarAST)31 ErrorQueue (org.antlr.v4.test.runtime.ErrorQueue)29 Rule (org.antlr.v4.tool.Rule)25 ParserATNFactory (org.antlr.v4.automata.ParserATNFactory)21 STGroupString (org.stringtemplate.v4.STGroupString)21 ArrayList (java.util.ArrayList)18 ATNState (org.antlr.v4.runtime.atn.ATNState)18 BaseRuntimeTest.antlrOnString (org.antlr.v4.test.runtime.BaseRuntimeTest.antlrOnString)17 ST (org.stringtemplate.v4.ST)17 ParseTree (org.antlr.v4.runtime.tree.ParseTree)15 BaseRuntimeTest (org.antlr.v4.test.runtime.BaseRuntimeTest)15