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package org.shedlang.compiler.parser;
import org.junit.jupiter.api.Test;
import org.shedlang.compiler.parser.errors.UnrecognisedEscapeSequenceError;
import org.shedlang.compiler.sources.FileFragmentSource;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.shedlang.compiler.ast.untyped.UntypedNodeMatchers.isUntypedStringLiteralNode;
import static org.shedlang.compiler.parser.ParserTesting.parseString;
import static org.zwobble.precisely.AssertThat.assertThat;
import static org.zwobble.precisely.Matchers.*;
public class ParserStringLiteralTests {
@Test
public void canParseEmptyString() {
var source = "\"\"";
var node = parseString(source, Parser::parseTopLevelExpression);
assertThat(node, isUntypedStringLiteralNode(""));
}
@Test
public void canParseStringWithUnescapedCharacters() {
var source = "\"abc 123 XYZ\"";
var node = parseString(source, Parser::parseTopLevelExpression);
assertThat(node, isUntypedStringLiteralNode("abc 123 XYZ"));
}
@Test
public void canParseStringWithEscapedCharacters() {
var source = "\"\\n\\r\\t\\\\\\\"\"";
var node = parseString(source, Parser::parseTopLevelExpression);
assertThat(node, isUntypedStringLiteralNode("\n\r\t\\\""));
}
@Test
public void whenStringHasUnrecognisedEscapeSequenceThenExceptionIsThrown() {
var source = "\"a\\ab\"";
var error = assertThrows(
UnrecognisedEscapeSequenceError.class,
() -> parseString(source, Parser::parseTopLevelExpression)
);
assertThat(error.getMessage(), equalTo("Unrecognised escape sequence: \\a"));
assertThat(error.source(), instanceOf(FileFragmentSource.class, allOf(
has("characterIndexStart", x -> x.sourceRange().start().characterIndex(), equalTo(2)),
has("characterIndexEnd", x -> x.sourceRange().end().characterIndex(), equalTo(4))
)));
}
}
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