public static void ExtractQuoteString(LexerCursor cursor)
{
var closed = false;
while (cursor.TryMatch("QUOTE:START", "\""))
{
cursor.PassThrough("ESCAPE", @"\\.");
if (cursor.TryMatch("QUOTE:END", @""""))
{
closed = true;
break;
}
cursor.PassThrough("TEXT_RUN", @"[^\\\""]+");
// LOOP EXIT
if (cursor.EOF)
{
break;
}
}
if (closed == false)
{
cursor.FakeMatch("QUOTE:END", @"""");
}
}
public static void ExtractQuoteString(LexerCursor cursor)
{
bool?closed = null;
while (!cursor.EOF)
{
if (cursor.Peek(null, "\""))
{
if (null == closed)
{
closed = false;
cursor.TryMatch(KeywordQuoteContent, "\"");
}
else if (cursor.TryMatch(KeywordQuoteContent, @"([""](\~\d{1,4}(\z|(?=\s)))?)"))
{
closed = true;
break;
}
}
if (closed == null)
{
break;
}
if (cursor.TryMatch(KeywordQuoteContent, @"\\[\""]"))
{
continue;
}
// tag unexpected backslashes to be ignored
if (cursor.TryMatch(null, @"(\\$|\\.)"))
{
continue;
}
if (cursor.TryMatch(KeywordQuoteContent, @"[^\\\""]+"))
{
continue;
}
// LOOP EXIT
if (cursor.EOF)
{
break;
}
}
if (closed == false)
{
cursor.FakeMatch(KeywordQuoteContent, @"""", pop: true);
}
}
private static bool ExtractContent(LexerCursor cursor)
{
cursor.PassThrough(KeywordWhiteSpace, @"\s+");
ExtractQuoteString(cursor);
if (cursor.TryMatch(KeywordOperator, "\\+") ||
cursor.TryMatch(KeywordOperator, "\\-") ||
cursor.TryMatch(KeywordOperator, "\\!") ||
cursor.TryMatch(KeywordOperator, "NOT[\\s$]"))
{
return(true);
}
if (ExtractOperator(cursor) || ExtractSearchTerm(cursor))
{
return(true);
}
return(false);
}
private static int GobbleUnsupported(int lastPosition, LexerCursor cursor)
{
if (lastPosition != cursor.Position)
{
lastPosition = cursor.Position;
}
else
{
cursor.TryMatch(null, ".");
}
return(lastPosition);
}
private static bool ExtractSearchTerm(LexerCursor cursor)
{
return(cursor.TryMatch(KeywordOperand, @"(?<var>[\w\.\*\?]+)(\~0*\.\d{1,4}(\z|(?=\s)))?"));
}
private static bool ExtractOperator(LexerCursor cursor)
{
return(cursor.TryMatch(KeywordOperator, @"(\bOR\b|\bAND\b)"));
}
public static LexerCursor ParseEquation(string input)
{
var cursor = new LexerCursor {
Input = input
};
while (cursor.Peek("$", @".", false))
{
// LOOP EXIT
if (cursor.EOF)
{
break;
}
cursor.Ignore(@"\s+");
ExtractNumber(cursor);
while (ExtractVariable(cursor))
{
cursor.Ignore(@"\s+");
cursor.PassThrough("MEMBER", @"\.");
// LOOP EXIT
if (cursor.EOF)
{
break;
}
}
cursor.Ignore(@"\s+");
ExtractQuoteString(cursor);
cursor.Ignore(@"\s+");
var parenthDepthCounter = 0;
while (!cursor.EOF)
{
cursor.TryPush("(", ref parenthDepthCounter);
cursor.Ignore(@"\s+");
if (cursor.TryMatch(","))
{
continue;
}
if (cursor.TryMatch("++"))
{
continue;
}
if (cursor.TryMatch("--"))
{
continue;
}
if (ExtractVariable(cursor))
{
continue;
}
if (ExtractNumber(cursor))
{
continue;
}
if (cursor.TryMatch("*"))
{
continue;
}
if (cursor.TryMatch("\\"))
{
continue;
}
if (cursor.TryMatch("%"))
{
continue;
}
if (cursor.TryMatch("+"))
{
continue;
}
if (cursor.TryMatch("-"))
{
continue;
}
if (cursor.TryMatch("==="))
{
continue;
}
if (cursor.TryMatch("<="))
{
continue;
}
if (cursor.TryMatch(">="))
{
continue;
}
if (cursor.TryMatch("<"))
{
continue;
}
if (cursor.TryMatch(">"))
{
continue;
}
if (cursor.TryMatch("=="))
{
continue;
}
if (cursor.TryPop(")", ref parenthDepthCounter))
{
break;
}
cursor.PassThrough(".");
}
}
return(cursor);
}
private static bool ExtractNumber(LexerCursor cursor)
{
return(cursor.TryMatch("NUMBER", @"\d+(\.\d+)?"));
}
private static bool ExtractVariable(LexerCursor cursor)
{
return(cursor.TryMatch("ARG", @"\w([\d\w])*"));
}