public IEnumerable<int> GetPositions(int position, RegexBlock block)
{
var zeroOrOneBlock = block as ZeroOrOneBlock;
if (zeroOrOneBlock != null)
return GetPositionsFromZeroOrOneBlock(position, zeroOrOneBlock);
var zeroOrMoreBlock = block as ZeroOrMoreBlock;
if (zeroOrMoreBlock != null)
return GetPositionsFromZeroOrMoreBlock(position, zeroOrMoreBlock);
var oneOrMoreBlock = block as OneOrMoreBlock;
if (oneOrMoreBlock != null)
return GetPositionsFromOneOrMoreBlock(position, oneOrMoreBlock);
var orGroupBlock = block as OrGroupBlock;
if (orGroupBlock != null)
return GetPositionsFromOrGroupBlock(position, orGroupBlock);
var andGroupBlock = block as AndGroupBlock;
if (andGroupBlock != null)
return GetPositionsFromAndGroupBlock(position, andGroupBlock);
var visitor = new CheckerRegexVisitor(position, _input, _groupValues);
return visitor.GetPositions(block);
}
public void GetPositionsFromAnyCharacterBlockTest()
{
string input = "\0";
var visitor1 = new CheckerRegexVisitor(0, input, null);
var block = new AnyCharacterBlock();
var positions1 = visitor1.GetPositions(block);
positions1.Should().BeEquivalentTo(new[] { 1 });
input = "a";
var visitor2 = new CheckerRegexVisitor(0, input, null);
var positions2 = visitor2.GetPositions(block);
positions2.Should().BeEquivalentTo(new[] { 1 });
}
public void GetPositionsFromBackreferenceBlockTest()
{
var groupValues = new Dictionary<int, string>();
string input = "\0\0";
int groupId = 1;
var visitor1 = new CheckerRegexVisitor(0, input, groupValues);
groupValues[groupId] = "ab";
var backreferenceBlock = new BackreferenceBlock(groupId);
var positions1 = visitor1.GetPositions(backreferenceBlock);
positions1.Should().BeEquivalentTo(new[] { 2 });
groupValues[groupId] = "abc";
var visitor2 = new CheckerRegexVisitor(0, input, groupValues);
var positions2 = visitor2.GetPositions(backreferenceBlock);
positions2.Should().BeEmpty();
}
public void GetPositionsFromInclusiveSetBlockTest()
{
string input = "\0";
var visitor1 = new CheckerRegexVisitor(0, input, null);
var inclusiveSetBlock = new InclusiveSetBlock("abc");
var positions1 = visitor1.GetPositions(inclusiveSetBlock);
positions1.Should().BeEquivalentTo(new[] { 1 });
input = "a";
var visitor2 = new CheckerRegexVisitor(0, input, null);
var positions2 = visitor2.GetPositions(inclusiveSetBlock);
positions2.Should().BeEquivalentTo(new[] { 1 });
input = "d";
var visitor3 = new CheckerRegexVisitor(0, input, null);
var positions3 = visitor3.GetPositions(inclusiveSetBlock);
positions3.Should().BeEmpty();
}
public void GetPositionsFromTextBlockTest()
{
var textBlock1 = new TextBlock("a");
var visitor1 = new CheckerRegexVisitor(0, "\0", null);
var positions1 = visitor1.GetPositions(textBlock1);
positions1.Should().BeEquivalentTo(new[] { 1 });
var visitor2 = new CheckerRegexVisitor(1, "\0", null);
var positions2 = visitor2.GetPositions(textBlock1);
positions2.Should().BeEmpty();
// Text block longer than symbols that remain unfilled.
var textBlock2 = new TextBlock("aa");
var visitor3 = new CheckerRegexVisitor(0, "\0", null);
var positions3 = visitor3.GetPositions(textBlock2);
positions3.Should().BeEmpty();
var visitor4 = new CheckerRegexVisitor(0, "aa", null);
var positions4 = visitor4.GetPositions(textBlock2);
positions4.Should().BeEquivalentTo(new[] { 2 });
var textBlock3 = new TextBlock("ab");
var visitor5 = new CheckerRegexVisitor(0, "aa", null);
var positions5 = visitor5.GetPositions(textBlock3);
positions5.Should().BeEmpty();
}
