internal ConstantNode(Token token)
{
_token = token;
_value = token.Value;
}
//#if !NETMF
// public static IEnumerable<ExpressionVariable> EnumerateVariables(string expression)
// {
// int index = 0;
// int start;
// int len = expression.Length;
// int iline = 0;
// int ichar = 0;
// while (index < len)
// {
// var token = GetNextToken(expression, ref index, out start, ref iline, ref ichar);
// if (token.TokenType == TokenTypes.Variable)
// {
// yield return new ExpressionVariable
// {
// Name = (string)token.Value,
// Start = start,
// Length = index - start
// };
// }
// else if (token.TokenType == TokenTypes.Term)
// {
// foreach (var subVar in EnumerateVariables((string)token.Value))
// {
// yield return new ExpressionVariable
// {
// Name = subVar.Name,
// Start = start + 1 + subVar.Start, // offset of term + 1 for bracket
// Length = subVar.Length
// };
// }
// }
// }
// }
//#endif
private Token GetNextToken(string exp, ref int index, out int start, ref int iline, ref int ichar)
{
Token token = new InvalidToken();
while (index < exp.Length && IsWhiteSpace(exp[index]))
{
if (exp[index] == '\n')
{
ichar = 1;
++iline;
}
++ichar;
++index;
}
start = index;
if (index >= exp.Length || start >= exp.Length || exp[index] == ';')
{
token = new Token {
TokenType = TokenTypes.End,
lineStart = iline,
lineCharStart = ichar,
charStart = start,
charEnd = index - start
};
}
else if (exp[index] == '\n')
{
token = new Token {
TokenType = TokenTypes.NewLine,
lineStart = iline,
lineCharStart = ichar,
charStart = start,
charEnd = index - start
};
}
else if (exp[index] == '(')
{
index = MatchCharPair(exp, start, '(', ')') + 1;
token = new Token
{
TokenType = TokenTypes.Term,
Value = exp.Substring(start + 1, (index - start) - 2),
lineStart = iline,
lineCharStart = ichar,
charStart = start,
charEnd = index - start
};
}
else if (exp[index] == '{')
{
index = MatchCharPair(exp, start, '{', '}') + 1;
token = new Token
{
TokenType = TokenTypes.Term,
Value = exp.Substring(start + 1, (index - start) - 2),
lineStart = iline,
lineCharStart = ichar,
charStart = start,
charEnd = index - start
};
}
else if (exp[index] == '[')
{
index = MatchCharPair(exp, start, '[', ']') + 1;
token = new Token
{
TokenType = TokenTypes.Term,
Value = exp.Substring(start + 1, (index - start) - 2),
lineStart = iline,
lineCharStart = ichar,
charStart = start,
charEnd = index - start
};
}
else if (exp[index] == '\"')
{
index = MatchQuote(exp, start) + 1;
token = new Token
{
TokenType = TokenTypes.StringConst,
Value = UnescapeString(exp.Substring(start, index - start)),
lineStart = iline,
lineCharStart = ichar,
charStart = start,
charEnd = index - start
};
}
else if (IsLetter(exp[index]) || exp[index] == '_' || exp[index] == ':' || exp[index] == '.' || exp[index] == '$')
{
++ichar;
++index;
while (index < exp.Length &&
(IsLetterOrDigit(exp[index]) || exp[index] == '-' || exp[index] == '_' || exp[index] == '.'))
{
++ichar;
if (exp[index] == '\n')
{
ichar = 1;
++iline;
}
++index;
}
var name = exp.Substring(start, index - start);
if (IsCmdlet(name))
{
}
else if (IsOperator(name))
{
token = new Token
{
TokenType = TokenTypes.Operator,
#if NETMF
Operator = _Operators[name.ToLower()] as Operator
#else
Operator = _Operators[name.ToLowerInvariant()]
#endif
,
lineStart = iline,
lineCharStart = ichar,
charStart = start,
charEnd = index - start
};
}
else if (IsConstant(name))
{
token = new Token
{
TokenType = TokenTypes.Constant,
Value = _Constants[name.ToLower()],
//Value = name,
lineStart = iline,
lineCharStart = ichar,
charStart = start,
charEnd = index - start
};
}
else if (IsVariable(name))
{
if (!this._Variables.ContainsKey(name))
{
this._Variables.Add(name, new object());
}
token = new Token
{
TokenType = TokenTypes.Variable,
Value = name,
lineStart = iline,
lineCharStart = ichar,
charStart = start,
charEnd = index - start
};
}
else
{
throw new CommandNotFoundException(String.Format(
@"{0} : The term '{0}' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:{1} char:{2}
+ {0}
+ ~~~~
+CategoryInfo : ObjectNotFound: ({0}:String) [], CommandNotFoundException
+ FullyQualifiedErrorId : CommandNotFoundException
.", name, iline, ichar));
}
}
else if (IsDigit(exp[index]))
{
++ichar;
++index;
while (index < exp.Length &&
(IsDigit(exp[index]) || exp[index] == '.' || exp[index] == 'e'))
{
++ichar;
if (exp[index] == '\n')
{
ichar = 1;
++iline;
}
++index;
}
var no = exp.Substring(start, index - start);
token = new Token
{
TokenType = TokenTypes.Number,
lineStart = iline,
lineCharStart = ichar,
charStart = start,
charEnd = index - start
};
if (no.IndexOf('.') >= 0 || no.IndexOf('e') >= 0)
{
token.Value = Double.Parse(no);
}
else
{
token.Value = Int32.Parse(no);
}
}
else if (IsOperatorSym(exp[index]))
{
++ichar;
++index;
while (index < exp.Length && IsOperatorSym(exp[index]))
{
if (exp[index] == '\n')
{
ichar = 1;
++iline;
}
++index;
}
var ops = exp.Substring(start, index - start);
if (IsAssignmentOperator(ops))
{
token = new Token
{
TokenType = TokenTypes.Assignment,
Operator = new Operator("=", 0, true),
lineStart = iline,
lineCharStart = ichar,
charStart = start,
charEnd = index - start
};
}
else if (IsOperator(ops))
{
token = new Token
{
TokenType = TokenTypes.Operator,
#if NETMF
Operator = _Operators[ops.ToLower()] as Operator
#else
Operator = _Operators[ops.ToLowerInvariant()]
#endif
,
lineStart = iline,
lineCharStart = ichar,
charStart = start,
charEnd = index - start
};
}
else
{
throw new Exception("Operator symbol matched but no Operator found.");
}
}
// TODO: Figure out why this goes crazy!
if (token != null)
// But this is fine
//if (!(token is InvalidToken))
{
return token;
}
else
{
throw new ParserException(String.Concat("Unallowed symbol: '", exp.Substring(start, index - start), "'"));
}
}