private bool check(char ch)
{
if (_reader.Peek() == ch)
{
_reader.Read();
return(true);
}
return(false);
}
/// <summary>
/// Load script from string
/// </summary>
/// <param name="scriptXml">script as XML</param>
public void Load(string scriptXml)
{
Items.Clear();
bool close = true;
var r = new ParsingReader(new StringReader(scriptXml));
try
{
r.SkipWhiteSpace();
if (r.Peek() == '<')
{
// Get a script file
XmlReaderSettings rs = new XmlReaderSettings();
rs.IgnoreWhitespace = false;
rs.ValidationType = ValidationType.None;
using (XmlReader xr = XmlReader.Create(r, new XmlReaderSettings()
{
ConformanceLevel = ConformanceLevel.Fragment
}))
{
close = false;
Load(xr);
return;
}
}
if (r.Peek() == '=')
{
r.Read();
Items.Add(new Eval {
Value = r.ReadToEnd()
});
return;
}
Items.Add(new Code {
Value = r.ReadToEnd()
});
return;
}
finally
{
if (close)
{
r.Close();
}
}
}
/// <summary>
/// Parse stream and return the expression tree
/// </summary>
/// <param name="r">Stream</param>
/// <returns>Parsed expression or null if no expression is found on stream</returns>
public IOperation Parse(ParsingReader r)
{
List <IOperation> data = new List <IOperation>();
while (!r.IsEOF)
{
TokenQueue tokenQueue = new TokenQueue(this, r);
var ex = parseSingleStatement(tokenQueue, -1);
if (ex == null)
{
break;
}
if (data.Count > 0)
{
data.Add(new Operations.OperationPop());
}
data.Add(ex);
r.SkipWhiteSpaceAndComments();
if (r.Peek() != ';')
{
break;
}
do
{
r.Read();
r.SkipWhiteSpaceAndComments();
} while (r.Peek() == ';');
}
if (data.Count == 0)
{
return(null);
}
if (data.Count == 1)
{
return(data[0]);
}
return(new Operations.OperationExpression(data.ToArray()));
}
/// True if str is a number
public static bool IsNumber(string str)
{
if (str == null)
{
throw new ArgumentNullException("str");
}
using (var sr = new ParsingReader(str))
{
if (sr.ReadNumber() == null)
{
return(false);
}
sr.SkipWhiteSpaceAndComments();
if (sr.Peek() != -1)
{
return(false);
}
}
return(true);
}
/// Returns null if str is not a number, or its value otherwise
public static ValueType TryParseNumber(string stringToParse)
{
if (stringToParse == null)
{
return(null);
}
using (var sr = new ParsingReader(stringToParse))
{
sr.SkipWhiteSpaceAndComments();
ValueType o = sr.ReadNumber();
if (o == null)
{
return(null);
}
sr.SkipWhiteSpaceAndComments();
if (sr.Peek() != -1)
{
return(null);
}
return(o);
}
}
/// Parse string to a number. 10 and hex numbers (like 0x222) are allowed. Suffixes like 20.3f are also allowed.
public static ValueType ParseNumber(string str)
{
if (str == null)
{
throw new ArgumentNullException("str");
}
using (var sr = new ParsingReader(str))
{
sr.SkipWhiteSpaceAndComments();
ValueType o = sr.ReadNumber();
if (o == null)
{
throw new ParsingException("Invalid numeric expression at " + sr.ReadLine());
}
sr.SkipWhiteSpaceAndComments();
if (sr.Peek() != -1)
{
throw new ParsingException("Invalid numeric expression, unexpected characters at " + sr.ReadLine());
}
return(o);
}
}
private object expandVars(TransformRules rules, string s)
{
string begin;
string end;
if ((rules & TransformRules.ExpandDual) == TransformRules.ExpandDual)
{
begin = "${{";
end = "}}";
}
else if ((rules & TransformRules.ExpandDualSquare) == TransformRules.ExpandDualSquare)
{
begin = "[[";
end = "]]";
}
else if ((rules & TransformRules.ExpandSquare) == TransformRules.ExpandSquare)
{
begin = "[";
end = "]";
}
else if ((rules & TransformRules.Expand) == TransformRules.Expand)
{
begin = "${";
end = "}";
}
else
{
return(s);
}
if (s.IndexOf(begin, StringComparison.Ordinal) != -1)
{
StringBuilder sbNew = new StringBuilder();
using (var sr = new ParsingReader(new StringReader(s)))
{
int ptr = 0;
bool first = true;
while (!sr.IsEOF)
{
char ch = (char)sr.Read();
if (ch != begin[ptr])
{
sbNew.Append(begin, 0, ptr);
sbNew.Append(ch);
ptr = 0;
first = false;
continue;
}
ptr++;
if (ptr < begin.Length)
{
continue;
}
if (sr.Peek() == '{' || sr.Peek() == '[')
{
sbNew.Append(begin);
ptr = 0;
first = false;
continue;
}
//
object sv = EvalMulti(sr);
sv = ((rules & TransformRules.ExpandTrimOnly) == TransformRules.ExpandTrimOnly)
? Utils.TransformStr(Utils.To <string>(sv), rules & TransformRules.TrimMask)
: sv;
sv = ((rules & TransformRules.ExpandReplaceOnly) == TransformRules.ExpandReplaceOnly)
? Utils.TransformStr(Utils.To <string>(sv), rules & TransformRules.ReplaceMask)
: sv;
// Now read the trailing stuff
sr.SkipWhiteSpace();
for (ptr = 0; ptr < end.Length; ++ptr)
{
sr.ReadAndThrowIfNot(end[ptr]);
}
if (sr.IsEOF && first)
{
return(sv);
}
ptr = 0;
first = false;
sbNew.Append(Utils.To <string>(sv));
}
for (int i = 0; i < ptr; ++i)
{
sbNew.Append(begin[i]);
}
}
return(sbNew.ToString());
}
return(s);
}
/// Parse multi-expression, like ${a|b|=2+3}
public IOperation ParseMulti(ParsingReader reader)
{
Operations.OperationVariableAccess va = new Operations.OperationVariableAccess();
StringBuilder sb = new StringBuilder();
bool orMet = true;
int n;
while ((n = reader.Peek()) != -1)
{
var q = (char)n;
if (q == '}' || q == ')' || q == ']')
{
break;
}
switch (q)
{
case '|':
reader.Read();
va.AddName(sb.ToString());
sb.Length = 0;
orMet = true;
break;
case '\'':
case '\"':
case '`':
orMet = false;
if (sb.Length != 0)
{
reader.ThrowParsingException("Quote must be a first character");
}
va.AddValue(reader.ReadQuote());
reader.SkipWhiteSpaceAndComments();
if (reader.Peek() != '}' && reader.Peek() != '|')
{
reader.ThrowParsingException("Unexpected character '" + (char)reader.Peek() + "'");
}
sb.Length = 0;
break;
case '=':
orMet = false;
reader.Read();
var v = Parse(reader);
if (v != null)
{
va.AddExpression(v);
}
else
{
va.AddValue(null);
}
break;
default:
orMet = false;
sb.Append(q);
reader.Read();
break;
}
}
if (sb.Length > 0 || orMet)
{
va.AddName(sb.ToString());
}
return(va);
}
