/// <summary>
/// Tries to parse all specified items except some others.
/// </summary>
public bool ParseExcept(LexicalState state, LexicalItem main, LexicalItem exception)
{
int index = state.Position;
if (!main.Parse(state))
{
return(false);
}
string parsed = state.Get(main.Key, index);
LexicalState check = new LexicalState(parsed);
if (exception.Parse(check))
{
if (check.IsEndOfData)
{
state.Reset(index);
return(false);
}
}
state.AddBack(Key, index);
return(true);
}
/// <summary>
/// Tries to parse a batch of similar lexical items with specified delimiter.
/// </summary>
public bool ParseMany(LexicalState state, LexicalItem part, LexicalItem delimiter)
{
int index = state.Position;
if (!part.Parse(state))
{
return(false);
}
while (true)
{
int lastIndex = state.Position;
if (delimiter != null)
{
if (!delimiter.Parse(state))
{
break;
}
}
if (!part.Parse(state))
{
state.Reset(lastIndex);
break;
}
}
state.AddBack(Key, index);
return(true);
}
/// <summary>
/// Performs tests for letter lexem.
/// </summary>
private void CheckLetter(LexicalItem item, string letter, bool canEscape)
{
string lower = letter.ToLowerInvariant();
string upper = letter.ToUpperInvariant();
string lowerHex = ((int)lower[0]).ToString("x");
string upperHex = ((int)upper[0]).ToString("x");
string lowerHex1 = lowerHex.Substring(0, 1);
string lowerHex2 = lowerHex.Substring(1, 1);
string upperHex1 = upperHex.Substring(0, 1);
string upperHex2 = upperHex.Substring(1, 1);
string[] hexVariants = new[]
{
lowerHex1.ToLower() + lowerHex2.ToLower(),
lowerHex1.ToLower() + lowerHex2.ToUpper(),
lowerHex1.ToUpper() + lowerHex2.ToLower(),
lowerHex1.ToUpper() + lowerHex2.ToUpper(),
upperHex1.ToLower() + upperHex2.ToLower(),
upperHex1.ToLower() + upperHex2.ToUpper(),
upperHex1.ToUpper() + upperHex2.ToLower(),
upperHex1.ToUpper() + upperHex2.ToUpper(),
};
Check(true, item, lower);
Check(true, item, upper);
Check(false, item, lower + " ");
Check(false, item, " " + lower);
Check(canEscape, item, "\\" + lower);
Check(canEscape, item, "\\" + upper);
Check(false, item, "\\\\" + lower);
Check(false, item, lower + "\\");
foreach (string hexVariant in hexVariants)
{
Check(true, item, "\\" + hexVariant);
Check(true, item, "\\0" + hexVariant);
Check(true, item, "\\00" + hexVariant);
Check(true, item, "\\000" + hexVariant);
Check(true, item, "\\0000" + hexVariant);
Check(false, item, "\\00000" + hexVariant);
Check(true, item, "\\" + hexVariant + " ");
Check(false, item, "\\" + hexVariant + " ");
Check(true, item, "\\0" + hexVariant + "\r\n");
Check(false, item, "\\0" + hexVariant + "\n\r");
Check(true, item, "\\00" + hexVariant + "\r");
Check(true, item, "\\00" + hexVariant + "\n");
Check(true, item, "\\00" + hexVariant + "\t");
Check(true, item, "\\00" + hexVariant + "\f");
}
}
/// <summary>
/// Checks whether specified data string can be fully parsed to the lexical item.
/// </summary>
public void Check(bool expected, LexicalItem item, string data)
{
bool result = Parse(item, data);
if (expected != result)
{
throw new AssertFailedException(
String.Format(
"Checking for [{0}] failed. Expected:<{1}>. Actual:<{2}>.",
data.ToDisplay(),
expected,
!expected));
}
}
/// <summary>
/// Tries to parses specified data string into lexical item.
/// </summary>
protected override bool Parse(LexicalItem item, string data)
{
LexicalState state = new LexicalState(data);
return item.ParseFull(state);
}
/// <summary>
/// Tries to parse all specified items except some others.
/// </summary>
public bool ParseExcept(LexicalState state, LexicalItem main, LexicalItem exception)
{
int index = state.Position;
if (!main.Parse(state))
return false;
string parsed = state.Get(main.Key, index);
LexicalState check = new LexicalState(parsed);
if (exception.Parse(check))
{
if (check.IsEndOfData)
{
state.Reset(index);
return false;
}
}
state.AddBack(Key, index);
return true;
}
/// <summary>
/// Tries to parse a batch of similar lexical items with specified delimiter.
/// </summary>
public bool ParseMany(LexicalState state, LexicalItem part, LexicalItem delimiter)
{
int index = state.Position;
if (!part.Parse(state))
return false;
while (true)
{
int lastIndex = state.Position;
if (delimiter != null)
{
if (!delimiter.Parse(state))
break;
}
if (!part.Parse(state))
{
state.Reset(lastIndex);
break;
}
}
state.AddBack(Key, index);
return true;
}
protected SpecificIdentifier(params LexicalItem[] items)
{
m_check = new ParseAll(items);
}
/// <summary>
/// Initializes a new instance.
/// </summary>
public LexicalTerminal(LexicalItem item)
{
m_item = item;
}
/// <summary> /// Tries to parses specified data string into lexical item. /// </summary> protected abstract bool Parse(LexicalItem item, string data);
protected SpecificAtKeyword(params LexicalItem[] items)
{
m_check = new ParseAll(items);
}