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Reject duplicate quantified type variables

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This commit is contained in:
Arne Keller 2021-07-09 12:26:18 +02:00
parent df218d8be8
commit 394b5a3d23
2 changed files with 17 additions and 1 deletions
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7
src/main/java/edu/kit/typicalc/model/parser/TypeAssumptionParser.java
View File

@ -441,7 +441,12 @@ public class TypeAssumptionParser {
.withToken(t, ParseError.ErrorType.TYPE_ASSUMPTION_ERROR));
}
int i = Integer.parseInt(input.substring(1));
variables.add(new TypeVariable(TypeVariableKind.USER_INPUT, i));
TypeVariable variable = new TypeVariable(TypeVariableKind.USER_INPUT, i);
if (variables.contains(variable)) {
return new ParserResult<>(ParseError.UNEXPECTED_TOKEN
.withToken(t, ParseError.ErrorType.TYPE_ASSUMPTION_ERROR));
}
variables.add(variable);
expectCommaOrDot = true;
return new ParserResult<>(this);
case COMMA:

11
src/test/java/edu/kit/typicalc/model/parser/TypeAssumptionParserTest.java
View File

@ -228,6 +228,17 @@ class TypeAssumptionParserTest {
assertTrue(expected.contains(Token.TokenType.COMMA));
}
@Test
void doesntAcceptDuplicateQuantifiedVariables() {
TypeAssumptionParser parser = new TypeAssumptionParser();
Result<Map<VarTerm, TypeAbstraction>, ParseError> type = parser.parse("id: ∀ t1, t1 : t1 -> t1");
assertTrue(type.isError());
ParseError error = type.unwrapError();
assertEquals(ParseError.UNEXPECTED_TOKEN, error);
assertEquals(Token.TokenType.VARIABLE, error.getCause().get().getType());
assertEquals(10, error.getCause().get().getPos());
}
@Test
void errors() {
Map<String, ParseError> tests = new HashMap<>();