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Updated unit tests to reflect new expectations for parser EOF handling

This commit is contained in:
Sam Harwell 2012-11-04 13:25:26 -06:00
parent a5016b60f9
commit a62775c4ba
1 changed files with 104 additions and 27 deletions
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131
tool/test/org/antlr/v4/test/TestATNInterpreter.java
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@ -68,17 +68,36 @@ public class TestATNInterpreter extends BaseTest {
Grammar g = new Grammar(
"parser grammar T;\n"+
"a : A | A B ;");
int errorIndex = 0;
int errorTokenType = 0;
checkMatchedAlt(lg, g, "a", 1);
checkMatchedAlt(lg, g, "ab", 2);
checkMatchedAlt(lg, g, "ac", 1);
checkMatchedAlt(lg, g, "abc", 2);
}
@Test(expected = NoViableAltException.class)
public void testMustTrackPreviousGoodAltWithEOF() 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) EOF;");
checkMatchedAlt(lg, g, "a", 1);
checkMatchedAlt(lg, g, "ab", 2);
try {
checkMatchedAlt(lg, g, "ac", 1);
}
catch (NoViableAltException re) {
errorIndex = re.getOffendingToken().getTokenIndex();
errorTokenType = re.getOffendingToken().getType();
assertEquals(1, re.getOffendingToken().getTokenIndex());
assertEquals(3, re.getOffendingToken().getType());
throw re;
}
assertEquals(1, errorIndex);
assertEquals(3, errorTokenType);
}
@Test public void testMustTrackPreviousGoodAlt2() throws Exception {
@ -91,20 +110,40 @@ public class TestATNInterpreter extends BaseTest {
Grammar g = new Grammar(
"parser grammar T;\n"+
"a : A | A B | A B C ;");
checkMatchedAlt(lg, g, "a", 1 );
checkMatchedAlt(lg, g, "a", 1);
checkMatchedAlt(lg, g, "ab", 2);
checkMatchedAlt(lg, g, "abc", 3);
int errorIndex = 0;
int errorTokenType = 0;
checkMatchedAlt(lg, g, "ad", 1);
checkMatchedAlt(lg, g, "abd", 2);
checkMatchedAlt(lg, g, "abcd", 3);
}
@Test(expected = NoViableAltException.class)
public void testMustTrackPreviousGoodAlt2WithEOF() 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 | A B | A B C) EOF;");
checkMatchedAlt(lg, g, "a", 1);
checkMatchedAlt(lg, g, "ab", 2);
checkMatchedAlt(lg, g, "abc", 3);
try {
checkMatchedAlt(lg, g, "abd", 1);
}
catch (NoViableAltException re) {
errorIndex = re.getOffendingToken().getTokenIndex();
errorTokenType = re.getOffendingToken().getType();
assertEquals(2, re.getOffendingToken().getTokenIndex());
assertEquals(4, re.getOffendingToken().getType());
throw re;
}
assertEquals(2, errorIndex);
assertEquals(4, errorTokenType);
}
@Test public void testMustTrackPreviousGoodAlt3() throws Exception {
@ -117,17 +156,40 @@ public class TestATNInterpreter extends BaseTest {
Grammar g = new Grammar(
"parser grammar T;\n"+
"a : A B | A | A B C ;");
int errorIndex = 0;
int errorTokenType = 0;
checkMatchedAlt(lg, g, "a", 2);
checkMatchedAlt(lg, g, "ab", 1);
checkMatchedAlt(lg, g, "abc", 3);
checkMatchedAlt(lg, g, "ad", 2);
checkMatchedAlt(lg, g, "abd", 1);
checkMatchedAlt(lg, g, "abcd", 3);
}
@Test(expected = NoViableAltException.class)
public void testMustTrackPreviousGoodAlt3WithEOF() 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 | A B C) EOF;");
checkMatchedAlt(lg, g, "a", 2);
checkMatchedAlt(lg, g, "ab", 1);
checkMatchedAlt(lg, g, "abc", 3);
try {
checkMatchedAlt(lg, g, "abd", 1);
}
catch (NoViableAltException re) {
errorIndex = re.getOffendingToken().getTokenIndex();
errorTokenType = re.getOffendingToken().getType();
assertEquals(2, re.getOffendingToken().getTokenIndex());
assertEquals(4, re.getOffendingToken().getType());
throw re;
}
assertEquals(2, errorIndex);
assertEquals(4, errorTokenType);
}
@Test public void testAmbigAltChooseFirst() throws Exception {
@ -183,22 +245,37 @@ public class TestATNInterpreter extends BaseTest {
Grammar g = new Grammar(
"parser grammar T;\n"+
"a : A B | A B | A B C ;");
checkMatchedAlt(lg, g, "ab", 1);
checkMatchedAlt(lg, g, "abc", 3);
checkMatchedAlt(lg, g, "abd", 1);
checkMatchedAlt(lg, g, "abcd", 3);
}
@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);
int errorIndex = 0;
int errorTokenType = 0;
try {
checkMatchedAlt(lg, g, "abd", 1);
}
catch (NoViableAltException re) {
errorIndex = re.getOffendingToken().getTokenIndex();
errorTokenType = re.getOffendingToken().getType();
assertEquals(2, re.getOffendingToken().getTokenIndex());
assertEquals(4, re.getOffendingToken().getType());
throw re;
}
assertEquals(2, errorIndex);
assertEquals(4, errorTokenType);
checkMatchedAlt(lg, g, "abcd", 3); // ignores d on end
}
@Test public void testSimpleLoop() throws Exception {