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package org.shedlang.compiler.parser;
import org.junit.jupiter.api.Test;
import org.shedlang.compiler.tokeniser.UnexpectedTokenException;
import org.shedlang.compiler.types.Visibility;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.shedlang.compiler.ast.untyped.UntypedNodeMatchers.*;
import static org.shedlang.compiler.parser.ParserTesting.parseString;
import static org.zwobble.precisely.AssertThat.assertThat;
import static org.zwobble.precisely.Matchers.*;
public class ParserFunctionDefinitionTests {
@Test
public void canParseMinimalFunction() {
var source = """
fun f() -> Unit {
}""";
var node = parseString(source, Parser::parseNamespaceStatement);
assertThat(
node,
isUntypedFunctionDefinitionNode()
.withName("f")
.withSignature(
isUntypedFunctionSignatureNode()
.withParams(isUntypedParamsNode(isSequence(), isSequence()))
.withEffect(isOptionalEmpty())
.withReturnType(isUntypedTypeLevelReferenceNode("Unit"))
)
.withBody(isUntypedBlockNode(isSequence()))
);
}
@Test
public void defaultVisibilityIsPrivate() {
var source = """
fun f() -> Unit {
}""";
var node = parseString(source, Parser::parseNamespaceStatement);
assertThat(
node,
isUntypedFunctionDefinitionNode().withVisibility(Visibility.PRIVATE)
);
}
@Test
public void whenFunIsPrefixedWithPubThenVisibilityIsPublic() {
var source = """
pub fun f() -> Unit {
}""";
var node = parseString(source, Parser::parseNamespaceStatement);
assertThat(
node,
isUntypedFunctionDefinitionNode().withVisibility(Visibility.PUBLIC)
);
}
@Test
public void canParseFunctionWithBodyWithoutReturn() {
var source = """
fun f() -> Unit {
a;
b;
c;
}""";
var node = parseString(source, Parser::parseNamespaceStatement);
assertThat(
node,
isUntypedFunctionDefinitionNode()
.withBody(isUntypedBlockNode(isSequence(
isUntypedExpressionStatementNode(isUntypedReferenceNode("a")),
isUntypedExpressionStatementNode(isUntypedReferenceNode("b")),
isUntypedExpressionStatementNode(isUntypedReferenceNode("c"))
)))
);
}
@Test
public void canParseFunctionWithBodyWithBlockReturn() {
var source = """
fun f() -> Unit {
a;
b;
c
}""";
var node = parseString(source, Parser::parseNamespaceStatement);
assertThat(
node,
isUntypedFunctionDefinitionNode()
.withBody(isUntypedBlockNode(isSequence(
isUntypedExpressionStatementNode(isUntypedReferenceNode("a")),
isUntypedExpressionStatementNode(isUntypedReferenceNode("b")),
isUntypedBlockReturnNode(isUntypedReferenceNode("c"))
)))
);
}
@Test
public void blockReturnEndsFunction() {
var source = """
fun f() -> Unit {
a;
b
c
}""";
var error = assertThrows(
UnexpectedTokenException.class,
() -> parseString(source, Parser::parseNamespaceStatement)
);
assertThat(error.getActual().value().toString(), equalTo("c"));
assertThat(error.getExpected(), equalTo(TokenType.SYMBOL_BRACE_CLOSE.toString()));
}
}
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