public static object parse(Expr rootParser, XPathLexer lexer)
{
string token = lexer.peak();
char ch = token[0];
if (ch == '(')
{
lexer.next();
var expr = rootParser.parse(lexer);
if (!lexer.next().Equals(")"))
{
throw new Exception("Error: Unclosed parentheses");
}
return(expr);
}
if (ch == '"' || ch == '\'')
{
lexer.next();
Dictionary <string, object> r = new Dictionary <string, object>();
r.Add("type", XPathAnalyzer.ExprType.LITERAL);
r.Add("string", token.Substring(1, (token.Length - 1) - 1));//token.slice(1, -1)
return(r);
}
if (ch == '$')
{
throw new Exception("Error: Variable reference are not implemented");
}
if (XPathLexer.RegexTest(token, @"^\d+$") || XPathLexer.RegexTest(token, @"^(\d+)?\.\d+$"))
{
lexer.next();
Dictionary <string, object> r = new Dictionary <string, object>();
r.Add("type", XPathAnalyzer.ExprType.NUMBER);
r.Add("number", float.Parse(token, CultureInfo.InvariantCulture));//token.slice(1, -1)
return(r);
}
if (lexer.peak(1) == "(" && !NodeTypeValidator.isValid(lexer.peak()))
{
return(FunctionCall.parse(rootParser, lexer));
}
return(null);
//throw new Exception("Error: Unhandle Expresion!");
}
public static bool isValidOp(XPathLexer lexer)
{
if (string.IsNullOrEmpty(lexer.peak()))
{
return(false);
}
char ch = lexer.peak()[0];
return(ch == '(' ||
ch == '\\' ||
ch == '\'' ||
ch == '$' ||
XPathLexer.RegexTest(ch + "", @"^\d+$") ||
XPathLexer.RegexTest(ch + "", @"^d+$^(\d+)?\.\d+$") ||
((lexer.peak(1) != null) && (lexer.peak(1).Equals("(")) && !NodeTypeValidator.isValid(lexer.peak())));
}
public static object parse(Expr rootParser, XPathLexer lexer)
{
Dictionary <string, object> ret = new Dictionary <string, object>();
if (!string.IsNullOrEmpty(lexer.peak()) && lexer.peak().Equals("*"))
{
lexer.next();
ret.Add("name", "*");
return(ret);
}
if (!string.IsNullOrEmpty(lexer.peak(1)) && lexer.peak(1).Equals("("))
{
if (NodeTypeValidator.isValid(lexer.peak()))
{
ret.Add("type", lexer.next());
lexer.next();
if (lexer.peak().Equals(")"))
{
lexer.next();
}
else
{
ret.Add("name", lexer.next());
lexer.next();
}
return(ret);
}
else
{
throw new Exception("Error: Unexpected token " + lexer.peak());
}
}
ret = new Dictionary <string, object>();
ret.Add("name", lexer.next());
return(ret);
}
