//private static bool IsDot(Parser.ParseContext context, out OperatorType operatorType, out int offset)
//{
// offset = 0;
// operatorType = OperatorType.None;
// string c = context.Expression.Substring(context.TokenPosition, 1);
// if (c == "."){
// operatorType = OperatorType.Dot;
// offset = 1;
// return true;
// }
// return false;
//}
internal static bool ParseBinary(Parser.ParseContext context)
{
int offset = 0;
OperatorType operatorType = OperatorType.None;
bool isBinary = IsNumeric(context, out operatorType, out offset);
if (!isBinary)
{
isBinary = IsEquality(context, out operatorType, out offset);
}
if (!isBinary)
{
isBinary = IsComparator(context, out operatorType, out offset);
}
if (!isBinary)
{
isBinary = IsLogical(context, out operatorType, out offset);
}
if (!isBinary)
{
return(false);
}
ValidateTokenOrder(context, TokenType.BinaryOperator);
ElementOperator element = new ElementBinaryOperator(operatorType);
ProcessOperator(context, element);
context.TokenPosition += offset;
return(true);
}
internal static void ProcessOperator(Parser.ParseContext context, ElementOperator element)
{
Operator.AssignmentEnum assigment = element.Operator.Assigment;
int precedence = element.Operator.Precedence;
while (context.Stack.Count > 0)
{
Element lastElement = context.Stack.Pop();
if (lastElement.Type == TokenType.BinaryOperator || lastElement.Type == TokenType.UnitaryOperator || lastElement.Type == TokenType.Function)
{
Operator prevOperator = ((ElementOperator)lastElement).Operator;
if ((assigment == Operator.AssignmentEnum.Left && precedence >= prevOperator.Precedence) ||
(assigment == Operator.AssignmentEnum.Right && precedence > prevOperator.Precedence))
{
context.Ouput.Push(lastElement);
}
else
{
context.Stack.Push(lastElement);
break;
}
}
else
{
context.Stack.Push(lastElement);
break;
}
}
context.Stack.Push(element);
}
internal static bool Parse(Parser.ParseContext context)
{
char c = context.Expression[context.TokenPosition];
if (c == '@')
{
ValidateTokenOrder(context, TokenType.Selector);
StringBuilder selectorStr = new StringBuilder();
while (context.TokenPosition < context.Expression.Length)
{
c = context.Expression[context.TokenPosition];
//if (!VariableValidCharsRegExp.IsMatch(c)){
if (c == ']')
{
break;
}
selectorStr.Append(c);
context.TokenPosition++;
}
ElementSelector element = new ElementSelector(selectorStr.ToString());
context.Ouput.Push(element);
return(true);
}
return(false);
}
private static bool ParseTernaryElse(Parser.ParseContext context)
{
if (context.BpOrder.Count == 0 || context.BpOrder.Pop() != TokenType.TernaryIf)
{
throw new ELException("Invalid token at position " + context.TokenPosition);
}
ValidateTokenOrder(context, TokenType.TernaryElse);
Element element = new ElementTernaryOperator(TokenType.TernaryElse);
while (context.Stack.Count > 0)
{
Element lastElement = context.Stack.Pop();
if (lastElement.Type == TokenType.TernaryIf)
{
break;
}
else
{
context.Ouput.Push(lastElement);
}
}
context.Ouput.Push(element);
context.TokenPosition++;
return(true);
}
private static bool ParseTenaryIf(Parser.ParseContext context)
{
context.BpOrder.Push(TokenType.TernaryIf);
ValidateTokenOrder(context, TokenType.TernaryIf);
Element element = new ElementTernaryOperator(TokenType.TernaryIf);
context.LastTokenType = TokenType.TernaryIf;
while (context.Stack.Count > 0)
{
Element lastElement = context.Stack.Pop();
if (lastElement.Type == TokenType.OpenParenthesis)
{
context.Stack.Push(lastElement);
break;
}
else
{
context.Ouput.Push(lastElement);
}
}
context.Stack.Push(element);
context.Ouput.Push(element);
context.TokenPosition++;
return(true);
}
private static bool ParseBool(Parser.ParseContext context, out TokenType tokenType, out object value)
{
tokenType = TokenType.None;
value = null;
string subStr = context.Expression.Substring(context.TokenPosition, Math.Min(5, context.Expression.Length - context.TokenPosition));
if (testTrue.IsMatch(subStr))
{
//We validate first that way we don't need to process the rest of the string if not needed.
ValidateTokenOrder(context, TokenType.BooleanLiteral);
tokenType = TokenType.BooleanLiteral;
value = true;
context.TokenPosition += 4;
return(true);
}
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(6, context.Expression.Length - context.TokenPosition));
if (testFalse.IsMatch(subStr))
{
//We validate first that way we don't need to process the rest of the string if not needed.
ValidateTokenOrder(context, TokenType.BooleanLiteral);
tokenType = TokenType.BooleanLiteral;
value = false;
context.TokenPosition += 5;
return(true);
}
return(false);
}
private static bool ParseString(Parser.ParseContext context, out TokenType tokenType, out object value)
{
char c = context.Expression[context.TokenPosition];
value = null;
tokenType = TokenType.None;
if (c == '"' || c == '\'')
{
//We validate first that way we don't need to process the rest of the string if not needed.
ValidateTokenOrder(context, TokenType.StringLiteral);
StringBuilder content = new StringBuilder();
char encloseChar = c;
context.TokenPosition++;
while (context.TokenPosition < context.Expression.Length)
{
c = context.Expression[context.TokenPosition];
if (c == encloseChar)
{
tokenType = TokenType.StringLiteral;
value = content.ToString();
context.TokenPosition++;
return(true);
}
else if (c == '\\')
{
if (context.Expression.Length <= context.TokenPosition + 1)
{
throw new ELException("Invalid token at position " + context.TokenPosition);
}
else
{
context.TokenPosition++;
c = context.Expression[context.TokenPosition];
switch (c)
{
case '\'':
case '"':
content.Append(c);
break;
//TODO add extra excape handling
//http://ftp.icm.edu.pl/packages/tucows/html/programmer/jstut/jsTabChars.html
default:
throw new ELException("Invalid token at position " + context.TokenPosition);
}
context.TokenPosition++;
}
}
else
{
content.Append(c);
context.TokenPosition++;
}
}
throw new ELException("Invalid expression string not closed");
}
return(false);
}
private static bool ParseOpenParenthesis(Parser.ParseContext context)
{
context.BpOrder.Push(TokenType.OpenParenthesis);
ValidateTokenOrder(context, TokenType.OpenParenthesis);
Element element = new ElementGrouping(TokenType.OpenParenthesis);
context.Ouput.Push(element);
context.Stack.Push(element);
context.TokenPosition++;
return(true);
}
internal static bool ParseUnitary(Parser.ParseContext context)
{
char c = context.Expression[context.TokenPosition];
int offset = 0;
string subStr;
OperatorType operationType = OperatorType.None;
TokenType lastTokenType = context.LastTokenType;
switch (c)
{
case '-':
if (lastTokenType == TokenType.OpenBracket || lastTokenType == TokenType.OpenParenthesis ||
lastTokenType == TokenType.UnitaryOperator || lastTokenType == TokenType.Start ||
lastTokenType == TokenType.BinaryOperator)
{
offset = 1;
operationType = OperatorType.Negative;
break;
}
return(false);
case '!':
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(2, context.Expression.Length - context.TokenPosition));
if (!subStr.Equals("!="))
{
offset = 1;
operationType = OperatorType.Not;
break;
}
return(false);
case 'n':
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(4, context.Expression.Length - context.TokenPosition));
if (subStr.Equals("not ") || subStr.Equals("not("))
{
operationType = OperatorType.Not;
offset = 3;
break;
}
return(false);
default:
return(false);
}
ValidateTokenOrder(context, TokenType.UnitaryOperator);
ElementOperator element = new ElementUnitaryOperator(operationType);
ProcessOperator(context, element);
context.TokenPosition += offset;
return(true);
}
internal static bool ParseDot(Parser.ParseContext context)
{
char c = context.Expression[context.TokenPosition];
if (c == '.')
{
ValidateTokenOrder(context, TokenType.Dot);
ElementDot element = new ElementDot();
context.Ouput.Push(element);
context.TokenPosition++;
return(true);
}
return(false);
}
internal static bool Parse(Parser.ParseContext context)
{
char c = context.Expression[context.TokenPosition];
if (c.Equals('?'))
{
return(ParseTenaryIf(context));
}
else if (c.Equals(':'))
{
return(ParseTernaryElse(context));
}
return(false);
}
//private static bool IsObjectElement(Parser.ParseContext context, out OperatorType operatorType, out int offset){
// operatorType = OperatorType.None;
// offset = 0;
// string c = context.Expression.Substring(context.TokenPosition, 1);
// if (c.Equals(".")){
// operatorType = OperatorType.Dot;
// offset = 1;
// return true;
// }
// return false;
//}
private static bool IsEquality(Parser.ParseContext context, out OperatorType operatorType, out int offset)
{
operatorType = OperatorType.None;
offset = 0;
string c = context.Expression.Substring(context.TokenPosition, Math.Min(2, context.Expression.Length - context.TokenPosition));
switch (c)
{
case "==":
operatorType = OperatorType.Equals;
offset = 2;
return(true);
case "!=":
operatorType = OperatorType.NotEquals;
offset = 2;
return(true);
}
c = context.Expression.Substring(context.TokenPosition, Math.Min(3, context.Expression.Length - context.TokenPosition));
switch (c)
{
case "eq ":
operatorType = OperatorType.Equals;
offset = 3;
return(true);
case "eq(":
operatorType = OperatorType.Equals;
offset = 2;
return(true);
case "ne ":
operatorType = OperatorType.NotEquals;
offset = 3;
return(true);
case "ne(":
operatorType = OperatorType.NotEquals;
offset = 2;
return(true);
}
return(false);
}
internal static void ValidateTokenOrder(Parser.ParseContext context, TokenType tokenType)
{
bool hasToken = false;
for (int i = 0; i < tokenOrder[context.LastTokenType].Length; i++)
{
if (tokenOrder[context.LastTokenType][i] == tokenType)
{
hasToken = true;
break;
}
}
if (!hasToken)
{
throw new ELException("Invalid token at position " + context.TokenPosition);
}
context.LastTokenType = tokenType;
}
internal static bool Parse(Parser.ParseContext context)
{
if (ElementBinaryOperator.ParseBinary(context))
{
return(true);
}
else if (ElementUnitaryOperator.ParseUnitary(context))
{
return(true);
}
else if (ElementDot.ParseDot(context))
{
return(true);
}
else if (ElementFunction.ParseFunction(context))
{
return(true);
}
return(false);
}
internal static bool Parse(Parser.ParseContext context)
{
string c = context.Expression.Substring(context.TokenPosition, 1);
if (VariableStartRegExp.IsMatch(c))
{
ValidateTokenOrder(context, TokenType.Variable);
StringBuilder variableStr = new StringBuilder();
while (context.TokenPosition < context.Expression.Length)
{
c = context.Expression.Substring(context.TokenPosition, 1);
//if (c == ".")
//{
// variableStr.Append(c);
// context.TokenPosition++;
// c = context.Expression.Substring(context.TokenPosition, 1);
// if (VariableStartRegExp.IsMatch(c))
// {
// variableStr.Append(c);
// context.TokenPosition++;
// continue;
// }
// else
// {
// throw new ELException("Invalid token at position " + context.TokenPosition);
// }
//}
if (!VariableValidCharsRegExp.IsMatch(c))
{
break;
}
variableStr.Append(c);
context.TokenPosition++;
}
ElementVariable element = new ElementVariable(variableStr.ToString());
context.Ouput.Push(element);
return(true);
}
return(false);
}
internal static bool Parse(Parser.ParseContext context)
{
char c = context.Expression[context.TokenPosition];
switch (c)
{
case ')':
return(ParseCloseParenthesis(context));
case '(':
return(ParseOpenParenthesis(context));
case ']':
return(ParseCloseBracket(context));
case '[':
return(ParseOpenBracket(context));
default:
return(false);
}
}
private static bool ParseCloseParenthesis(Parser.ParseContext context)
{
if (context.BpOrder.Count == 0 || context.BpOrder.Pop() != TokenType.OpenParenthesis)
{
throw new ELException("Invalid token at " + context.TokenPosition);
}
ValidateTokenOrder(context, TokenType.CloseParenthesis);
Element element = new ElementGrouping(TokenType.CloseParenthesis);
while (context.Stack.Count > 0)
{
Element lastElement = context.Stack.Pop();
if (lastElement.Type.Equals(TokenType.OpenParenthesis))
{
break;
}
context.Ouput.Push(lastElement);
}
context.Ouput.Push(element);
context.TokenPosition++;
return(true);
}
internal static bool Parse(Parser.ParseContext context)
{
TokenType tokenType = TokenType.None;
object value = null;
bool isLiteral = ParseString(context, out tokenType, out value);
if (!isLiteral)
{
isLiteral = ParseNumeric(context, out tokenType, out value);
}
if (!isLiteral)
{
isLiteral = ParseBool(context, out tokenType, out value);
}
if (!isLiteral)
{
return(false);
}
ElementLiteral element = new ElementLiteral(tokenType, value);
context.Ouput.Push(element);
return(true);
}
internal static bool ParseFunction(Parser.ParseContext context)
{
char c = context.Expression[context.TokenPosition];
int offset = 0;
string subStr;
OperatorType operationType = OperatorType.None;
TokenType lastTokenType = context.LastTokenType;
switch (c)
{
case 'e':
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(6, context.Expression.Length - context.TokenPosition));
if (subStr.Equals("empty ") || subStr.Equals("empty("))
{
offset = 4;
operationType = OperatorType.Empty;
break;
}
return(false);
case 't':
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(9, context.Expression.Length - context.TokenPosition));
if (subStr == "toNumber " || subStr == "toNumber(")
{
offset = 7;
operationType = OperatorType.ToNumber;
break;
}
else if (subStr == "toString " || subStr == "toString(")
{
offset = 7;
operationType = OperatorType.ToString;
break;
}
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(10, context.Expression.Length - context.TokenPosition));
if (subStr == "toBoolean " || subStr == "toBoolean(")
{
offset = 8;
operationType = OperatorType.ToBoolean;
break;
}
return(false);
case 'm':
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(10, context.Expression.Length - context.TokenPosition));
if (subStr == "mathRound " || subStr == "mathRound(")
{
offset = 8;
operationType = OperatorType.MathRound;
break;
}
else if (subStr == "mathFloor " || subStr == "mathFloor(")
{
offset = 8;
operationType = OperatorType.MathFloor;
break;
}
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(9, context.Expression.Length - context.TokenPosition));
if (subStr == "mathCeil " || subStr == "mathCeil(")
{
offset = 7;
operationType = OperatorType.MathCeil;
break;
}
return(false);
case 'o':
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(14, context.Expression.Length - context.TokenPosition));
if (subStr == "os:htmlEncode " || subStr == "os:htmlEncode(")
{
offset = 12;
operationType = OperatorType.HtmlEncode;
break;
}
if (subStr == "os:htmlDecode " || subStr == "os:htmlDecode(")
{
offset = 12;
operationType = OperatorType.HtmlDecode;
break;
}
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(13, context.Expression.Length - context.TokenPosition));
if (subStr == "os:urlEncode " || subStr == "os:urlEncode(")
{
offset = 11;
operationType = OperatorType.UrlEncode;
break;
}
if (subStr == "os:urlDecode " || subStr == "os:urlDecode(")
{
offset = 11;
operationType = OperatorType.UrlDecode;
break;
}
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(18, context.Expression.Length - context.TokenPosition));
if (subStr == "os:jsStringEscape " || subStr == "os:jsStringEscape(")
{
offset = 16;
operationType = OperatorType.JsStringEscape;
break;
}
return(false);
case 'h':
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(11, context.Expression.Length - context.TokenPosition));
if (subStr == "htmlEncode " || subStr == "htmlEncode(")
{
offset = 9;
operationType = OperatorType.HtmlEncode;
break;
}
if (subStr == "htmlDecode " || subStr == "htmlDecode(")
{
offset = 9;
operationType = OperatorType.HtmlDecode;
break;
}
return(false);
case 'u':
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(10, context.Expression.Length - context.TokenPosition));
if (subStr == "urlEncode " || subStr == "urlEncode(")
{
offset = 8;
operationType = OperatorType.UrlEncode;
break;
}
if (subStr == "urlDecode " || subStr == "urlDecode(")
{
offset = 8;
operationType = OperatorType.UrlDecode;
break;
}
return(false);
case 'j':
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(15, context.Expression.Length - context.TokenPosition));
if (subStr == "jsStringEscape " || subStr == "jsStringEscape(")
{
offset = 13;
operationType = OperatorType.JsStringEscape;
break;
}
return(false);
default:
return(false);
}
ValidateTokenOrder(context, TokenType.Function);
context.TokenPosition += offset;
IList <IList <Element> > parameters = GetParameters(context);
ElementOperator element = new ElementFunction(operationType, parameters);
ProcessOperator(context, element);
return(true);
}
private static IList <IList <Element> > GetParameters(Parser.ParseContext context)
{
char c;
while (true)
{
context.TokenPosition++;
c = context.Expression[context.TokenPosition];
if (c == ' ' || c == '\t' || c == '\n' || c == '\r')
{
continue;
}
else if (c != '(')
{
throw new ELException("Invalid token");
}
else
{
break;
}
}
if (c != '(')
{
throw new ELException("Invalid token");
}
context.TokenPosition++;
int parentesisCount = 1;
StringBuilder param = new StringBuilder();
IList <IList <Element> > parms = new List <IList <Element> >();
string paramVal;
while (parentesisCount > 0 && context.TokenPosition < context.Expression.Length)
{
c = context.Expression[context.TokenPosition];
switch (c)
{
case ')':
parentesisCount--;
context.TokenPosition++;
if (parentesisCount == 0)
{
paramVal = param.ToString().Trim();
if (string.IsNullOrEmpty(paramVal))
{
throw new ELException("Invalid token parameter");
}
else
{
parms.Add(Parser.Parse(paramVal));
}
continue;
}
break;
case '(':
parentesisCount++;
break;
case ',':
paramVal = param.ToString().Trim();
if (string.IsNullOrEmpty(paramVal))
{
throw new EL.ELException("Invalid parameter");
}
else
{
parms.Add(Parser.Parse(paramVal));
}
context.TokenPosition++;
param.Remove(0, param.Length);
continue;
}
param.Append(c);
context.TokenPosition++;
}
return(parms);
}
private static bool IsNumeric(Parser.ParseContext context, out OperatorType operatorType, out int offset)
{
operatorType = OperatorType.None;
offset = 0;
string subStr;
char c = context.Expression[context.TokenPosition];
switch (c)
{
case '+':
operatorType = OperatorType.Addition;
offset = 1;
return(true);
case '/':
operatorType = OperatorType.Division;
offset = 1;
return(true);
case '%':
operatorType = OperatorType.Modulo;
offset = 1;
return(true);
case '*':
operatorType = OperatorType.Multiplication;
offset = 1;
return(true);
case '-':
TokenType lastTokenType = context.LastTokenType;
if (lastTokenType == TokenType.CloseParenthesis || lastTokenType == TokenType.StringLiteral ||
lastTokenType == TokenType.DecimalLiteral || lastTokenType == TokenType.IntegerLiteral ||
lastTokenType == TokenType.BooleanLiteral || lastTokenType == TokenType.Variable ||
lastTokenType == TokenType.CloseBracket)
{
operatorType = OperatorType.Substraction;
offset = 1;
return(true);
}
return(false);
case 'm':
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(4, context.Expression.Length - context.TokenPosition));
if (subStr.Equals("mod "))
{
operatorType = OperatorType.Modulo;
offset = 4;
return(true);
}
return(false);
case 'd':
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(4, context.Expression.Length - context.TokenPosition));
if (subStr.Equals("div "))
{
operatorType = OperatorType.Division;
offset = 4;
return(true);
}
return(false);
}
return(false);
}
private static bool IsComparator(Parser.ParseContext context, out OperatorType operatorType, out int offset)
{
offset = 0;
operatorType = OperatorType.None;
char c = context.Expression[context.TokenPosition];
string subStr;
switch (c)
{
case 'l':
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(3, context.Expression.Length - context.TokenPosition));
if (subStr.Equals("lt "))
{
operatorType = OperatorType.LessThan;
offset = 3;
return(true);
}
else if (subStr.Equals("lt("))
{
operatorType = OperatorType.LessThan;
offset = 2;
return(true);
}
else if (subStr.Equals("le "))
{
operatorType = OperatorType.LessThanEquals;
offset = 3;
return(true);
}
else if (subStr.Equals("le("))
{
operatorType = OperatorType.LessThanEquals;
offset = 2;
return(true);
}
return(false);
case 'g':
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(3, context.Expression.Length - context.TokenPosition));
if (subStr.Equals("gt "))
{
operatorType = OperatorType.GreaterThan;
offset = 3;
return(true);
}
else if (subStr.Equals("gt("))
{
operatorType = OperatorType.GreaterThan;
offset = 2;
return(true);
}
else if (subStr.Equals("ge "))
{
operatorType = OperatorType.GreaterThanEquals;
offset = 3;
return(true);
}
else if (subStr.Equals("ge("))
{
operatorType = OperatorType.GreaterThanEquals;
offset = 2;
return(true);
}
return(false);
case '>':
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(2, context.Expression.Length - context.TokenPosition));
if (subStr.Equals(">="))
{
operatorType = OperatorType.GreaterThanEquals;
offset = 2;
return(true);
}
else
{
operatorType = OperatorType.GreaterThan;
offset = 1;
return(true);
}
case '<':
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(2, context.Expression.Length - context.TokenPosition));
if (subStr.Equals("<="))
{
operatorType = OperatorType.LessThanEquals;
offset = 2;
return(true);
}
else
{
operatorType = OperatorType.LessThan;
offset = 1;
return(true);
}
}
return(false);
}
private static bool IsLogical(Parser.ParseContext context, out OperatorType operatorType, out int offset)
{
offset = 0;
operatorType = OperatorType.None;
char c = context.Expression[context.TokenPosition];
string subStr;
switch (c)
{
case '&':
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(2, context.Expression.Length - context.TokenPosition));
if (subStr.Equals("&&"))
{
operatorType = OperatorType.And;
offset = 2;
return(true);
}
return(false);
case '|':
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(2, context.Expression.Length - context.TokenPosition));
if (subStr.Equals("||"))
{
operatorType = OperatorType.Or;
offset = 2;
return(true);
}
return(false);
case 'a':
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(4, context.Expression.Length - context.TokenPosition));
if (subStr.Equals("and "))
{
operatorType = OperatorType.And;
offset = 4;
return(true);
}
else if (subStr.Equals("and("))
{
operatorType = OperatorType.And;
offset = 3;
return(true);
}
return(false);
case 'o':
subStr = context.Expression.Substring(context.TokenPosition, Math.Min(3, context.Expression.Length - context.TokenPosition));
if (subStr.Equals("or "))
{
operatorType = OperatorType.Or;
offset = 3;
return(true);
}
else if (subStr.Equals("or("))
{
operatorType = OperatorType.Or;
offset = 2;
return(true);
}
return(false);
}
return(false);
}
private static bool ParseNumeric(Parser.ParseContext context, out TokenType tokenType, out object value)
{
tokenType = TokenType.None;
value = null;
char c = context.Expression[context.TokenPosition];
if (IsNumeric(c))
{
//We validate first that way we don't need to process the rest of the string if not needed.
ValidateTokenOrder(context, TokenType.DecimalLiteral);
bool point = false;
bool scientific = false;
StringBuilder strValue = new StringBuilder();
while (context.TokenPosition < context.Expression.Length)
{
c = context.Expression[context.TokenPosition];
if (c.Equals('.'))
{
if (point || scientific)
{
throw new ELException("Invalid Token at position " + context.TokenPosition);
}
point = true;
strValue.Append(c);
context.TokenPosition++;
}
else if (IsNumber(c))
{
strValue.Append(c);
context.TokenPosition++;
}
else if (c == 'e' || c == 'E')
{
if (scientific)
{
throw new ELException("Invalid Token at position " + context.TokenPosition);
}
if (context.TokenPosition + 1 >= context.Expression.Length)
{
throw new ELException("Invalid Token at position " + context.TokenPosition);
}
scientific = true;
strValue.Append('e');
context.TokenPosition++;
c = context.Expression[context.TokenPosition];
if (c == '-' || c == '+')
{
strValue.Append(c);
if (context.TokenPosition + 1 >= context.Expression.Length)
{
throw new ELException("Invalid Token at position " + context.TokenPosition);
}
context.TokenPosition++;
c = context.Expression[context.TokenPosition];
}
if (!IsNumber(c))
{
throw new ELException("Invalid Token at position " + context.TokenPosition);
}
strValue.Append(c);
context.TokenPosition++;
}
else
{
break;
}
}
if (point || scientific)
{
double doubleValue = Double.Parse(strValue.ToString(), System.Globalization.NumberStyles.Float);
if (doubleValue == Math.Floor(doubleValue))
{
tokenType = TokenType.IntegerLiteral;
value = (int)doubleValue;
}
else
{
tokenType = TokenType.DecimalLiteral;
value = doubleValue;
}
}
else
{
tokenType = TokenType.IntegerLiteral;
value = Int32.Parse(strValue.ToString());
}
return(true);
}
return(false);
}
