public void Lexize_WrongSingleCharEscape_ThrowsLexingException(string input)
{
// Arrange
ILexer lexer = new MyStringLexer();
// Act
var ex = Assert.Throws <LexingException>(() => lexer.Lexize(input));
// Assert
Assert.That(ex.Message, Is.EqualTo("Bad escape."));
Assert.That(ex.Position, Is.EqualTo(new Position(0, 4)));
}
public void Lexize_EndAfterEscape_ThrowsLexingException(string input)
{
// Arrange
ILexer lexer = new MyStringLexer();
// Act
var ex = Assert.Throws <LexingException>(() => lexer.Lexize(input));
// Assert
Assert.That(ex.Message, Is.EqualTo("Unclosed string."));
Assert.That(ex.Position, Is.EqualTo(new Position(0, 18)));
}
public void Lexize_NewLineInString_ThrowsLexingException(string input)
{
// Arrange
ILexer lexer = new MyStringLexer();
// Act
var ex = Assert.Throws <LexingException>(() => lexer.Lexize(input));
// Assert
Assert.That(ex.Message, Is.EqualTo("Newline in string constant."));
Assert.That(ex.Position, Is.EqualTo(new Position(0, 14)));
}
public void Lexize_UnclosedString_ThrowsLexingException()
{
// Arrange
var input = " \"Unclosed string";
ILexer lexer = new MyStringLexer();
// Act
var ex = Assert.Throws <LexingException>(() => lexer.Lexize(input));
// Assert
Assert.That(ex.Message, Is.EqualTo("Unclosed string."));
Assert.That(ex.Position, Is.EqualTo(new Position(0, 17)));
}
public void EscapeString_MixedEscapes_EscapesCorrectly()
{
// Arrange
var input = "\"\\n\\v\\t\\r\\a\\b\\0\\t\\f\\\\\\u1488\"";
ILexer lexer = new MyStringLexer();
// Act
var tokens = lexer.Lexize(input);
// Assert
var textToken = (TextToken)tokens.Single();
Assert.That(textToken.Text, Is.EqualTo("\n\v\t\r\a\b\0\t\f\\\u1488"));
}