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https://gitlab.kit.edu/uskyk/typicalc.git
synced 2024-11-10 03:10:44 +00:00
Fix parsing of (λx.x)λx.x
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commit
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@ -107,6 +107,8 @@ public class LambdaParser {
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return new Result<>(let);
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}
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return new Result<>(let.unwrap());
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case VARIABLE:
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return new Result<>(parseApplication());
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case EOF:
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return new Result<>(null, ParseError.TOO_FEW_TOKENS);
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default:
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@ -140,8 +142,13 @@ public class LambdaParser {
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if (left.isError()) {
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return left;
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}
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while (ATOM_START_TOKENS.contains(token.getType())) {
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Result<LambdaTerm, ParseError> atom = parseAtom();
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while (ATOM_START_TOKENS.contains(token.getType()) || token.getType() == TokenType.LAMBDA) {
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Result<LambdaTerm, ParseError> atom;
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if (token.getType() == TokenType.LAMBDA) {
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atom = new Result<>(parseAbstraction());
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} else {
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atom = parseAtom();
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}
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if (atom.isError()) {
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return atom;
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}
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@ -71,7 +71,7 @@ public class Result<T, E> {
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*/
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public T unwrap() throws IllegalStateException {
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if (value == null) {
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throw new IllegalStateException("tried to unwrap an error");
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throw new IllegalStateException("tried to unwrap a result, but error = " + error);
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}
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return value;
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}
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@ -85,7 +85,7 @@ public class Result<T, E> {
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*/
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public E unwrapError() {
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if (error == null) {
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throw new IllegalStateException("tried to unwrap a value");
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throw new IllegalStateException("tried to unwrap the error, but value = " + value);
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}
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return error;
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}
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@ -15,6 +15,8 @@ import nl.jqno.equalsverifier.EqualsVerifier;
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import org.junit.jupiter.api.Test;
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class LambdaParserTest {
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private static final VarTerm X = new VarTerm("x");
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@Test
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void varTerm() {
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LambdaParser parser = new LambdaParser("x");
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@ -63,6 +65,11 @@ class LambdaParserTest {
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@Test
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void complicatedTerm() {
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LambdaParser parser = new LambdaParser("(λx.λy.x y 5)(λz.z)(true)");
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Result<LambdaTerm, ParseError> term = parser.parse();
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if (term.isError()) {
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System.err.println(term.unwrapError());
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System.err.println(term.unwrapError().getCause());
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}
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assertEquals(
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new AppTerm(
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new AppTerm(
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@ -86,7 +93,7 @@ class LambdaParserTest {
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),
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new BooleanTerm(true)
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),
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parser.parse().unwrap()
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term.unwrap()
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);
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}
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@Test
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@ -139,6 +146,17 @@ class LambdaParserTest {
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assertEquals(new Token(TokenType.RIGHT_PARENTHESIS, ")", 13), error.getCause());
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}
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@Test
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void bugFoundByThomas() {
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LambdaParser parser = new LambdaParser("(λx. x) λx. x");
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Result<LambdaTerm, ParseError> term = parser.parse();
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if (term.isError()) {
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System.err.println(term.unwrapError());
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System.err.println(term.unwrapError().getCause());
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}
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assertEquals(new AppTerm(new AbsTerm(X, X), new AbsTerm(X, X)), term.unwrap());
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}
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@Test
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void equality() {
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EqualsVerifier.forClass(Token.class).usingGetClass().verify();
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