public void SpanLengthShouldBeEqualToToStringLength()
{
// Arrange
var start = new CharacterNode('a');
var end = new CharacterNode('z');
var target = new CharacterClassRangeNode(start, end);
// Act
var(_, Length) = target.GetSpan();
// Assert
Length.ShouldBe(3);
}
public void EndShouldReturnOriginalEnd()
{
// Arrange
var start = new CharacterNode('a');
var end = new CharacterNode('z');
var target = new CharacterClassRangeNode(start, end);
// Act
var result = target.End;
// Assert
result.ShouldBe(end);
}
public void ToStringOnCharacterClassRangeNodeShouldReturnRangeWithStartAndEndSeperatedByDash()
{
// Arrange
var start = new CharacterNode('a');
var end = new CharacterNode('z');
var target = new CharacterClassRangeNode(start, end);
// Act
var result = target.ToString();
// Assert
result.ShouldBe("a-z");
}
public void EndSpanShouldStartAfterStartAndDash()
{
// Arrange
var start = new CharacterNode('a');
var end = new CharacterNode('z');
_ = new CharacterClassRangeNode(start, end);
// Act
var(Start, Length) = end.GetSpan();
// Assert
Start.ShouldBe(2);
Length.ShouldBe(1);
}
public void StartSpanShouldStartBe0()
{
// Arrange
var start = new CharacterNode('a');
var end = new CharacterNode('z');
_ = new CharacterClassRangeNode(start, end);
// Act
var(Start, Length) = start.GetSpan();
// Assert
Start.ShouldBe(0);
Length.ShouldBe(1);
}
/// <summary>
/// Parse a character range [x-y] inside a character class.
/// Throws an exception if the end of the range is a shorthand or unicode category or if start > end.
/// </summary>
/// <param name="startNode">The start of the range. Should be a CharacterNode or EscapeCharacterNode.</param>
private CharacterClassRangeNode ParseCharacterRange(RegexNode startNode)
{
RegexNode rangeEnd;
char rangeEndChar;
char ch = RightCharMoveRight();
// End of range is an escape character
if (ch == '\\')
{
rangeEnd = ParseBasicBackslash();
// Don't allow shorthand or unicode category/block in a character range.
if (!(rangeEnd is EscapeCharacterNode escapeChar))
{
throw MakeException(RegexParseError.BadClassInCharacterRange, rangeEnd);
}
rangeEndChar = escapeChar.Character;
}
// End of range is a literal character
else
{
rangeEnd = new CharacterNode(ch);
rangeEndChar = ch;
}
char rangeStartChar = startNode is CharacterNode characterNode ? characterNode.Character : ((EscapeCharacterNode)startNode).Character;
// The end of a character range should be greater than or equal to the start.
if (rangeStartChar > rangeEndChar)
{
throw MakeException(RegexParseError.ReverseCharacterRange);
}
var range = new CharacterClassRangeNode(startNode, rangeEnd);
return(range);
}
