/// <summary>
/// Captures an element left from the starting index.
/// </summary>
private ElementCapture CaptureLeft(string exp, int index)
{
if (string.IsNullOrWhiteSpace(exp))
return new ElementCapture() { Length = 0, StartIndex = 0, Identifier = "", Depth = 0 };
string identifier = "";
bool foundSeperatorChar = false;
int depth = 0;
StringEscapeHelper escaper = new RightToLeftStringEscapeHelper(exp, index);
while (index >= 0 && !foundSeperatorChar)
{
char t = exp[index];
escaper.CheckStartAt(index);
if (!escaper.IsString)
{
if (t == ')' || t == ']' || t == '}')
{
depth++;
}
else if (t == '(' || t == '[' || t == '{')
{
depth--;
}
}
if (depth < 0)
{
// this is when we walk out of the capture area because we are inside some area and a )]} appeared.
foundSeperatorChar = true;
}
else
{
if (!escaper.IsString && depth == 0)
{
if (t == '.')
{
// Check if the '.' is not a decimal seperator:
if (!Regex.IsMatch(identifier.Trim(), REGEX_NUMRIGHTDOT))
{
foundSeperatorChar = true;
}
}
else if (IDENTIFIER_SEPERATORS.Contains(t))
{
foundSeperatorChar = true;
}
}
// Append the char to the identifier:
if (!foundSeperatorChar)
{
identifier = t + identifier;
}
}
index--;
}
// Check for a minus in front of the identifier to indicate a negative number:
if (index >= -1 && exp[index + 1] == '-' && !string.IsNullOrWhiteSpace(identifier))
{
identifier = "-" + identifier;
index--;
}
if (foundSeperatorChar)
return new ElementCapture() { StartIndex = index + 2, Length = identifier.Length, Identifier = identifier, Depth = depth };
else
return new ElementCapture() { StartIndex = index + 1, Length = identifier.Length, Identifier = identifier, Depth = depth };
}
private SObject ToScriptObject(string exp)
{
exp = exp.Trim();
// This means it's either an indexer or an array
if (exp.EndsWith("]"))
{
if (!(exp.StartsWith("[") && !exp.Remove(0, 1).Contains("["))) // When there's no "[" besides the start, and it starts with [, then it is an array. Otherwise, do real check.
{
// It is possible that we are having a simple array declaration here.
// We check that by looking if we can find a "[" before the expression ends:
int depth = 0;
int index = exp.Length - 2;
int indexerStartIndex = 0;
bool hasIndexer = false;
StringEscapeHelper escaper = new RightToLeftStringEscapeHelper(exp, index);
while (index > 0 && !hasIndexer)
{
char t = exp[index];
escaper.CheckStartAt(index);
if (!escaper.IsString)
{
if (t == ')' || t == '}' || t == ']')
{
depth++;
}
else if (t == '(' || t == '{')
{
depth--;
}
else if (t == '[')
{
if (depth == 0)
{
if (index > 0)
{
indexerStartIndex = index;
hasIndexer = true;
}
}
else
{
depth--;
}
}
}
}
if (hasIndexer)
{
string indexerCode = exp.Remove(0, indexerStartIndex + 1);
indexerCode = indexerCode.Remove(indexerCode.Length - 1, 1);
string identifier = exp.Remove(indexerStartIndex);
SObject statementResult = ExecuteStatement(new ScriptStatement(indexerCode));
return ToScriptObject(identifier).GetMember(this, statementResult, true);
}
}
}
// Normal object return procedure:
// Negative number:
bool isNegative = false;
if (exp.StartsWith("-"))
{
exp = exp.Remove(0, 1);
isNegative = true;
}
double dblResult;
SObject returnObject;
if (exp == SObject.LITERAL_NULL)
{
returnObject = Null;
}
else if (exp == SObject.LITERAL_UNDEFINED)
{
returnObject = Undefined;
}
else if (exp == SObject.LITERAL_BOOL_FALSE)
{
returnObject = CreateBool(false);
}
else if (exp == SObject.LITERAL_BOOL_TRUE)
{
returnObject = CreateBool(true);
}
else if (exp == SObject.LITERAL_NAN)
{
returnObject = CreateNumber(double.NaN);
}
else if (exp == SObject.LITERAL_THIS)
{
returnObject = Context.This;
}
else if (SNumber.TryParse(exp, out dblResult))
{
returnObject = CreateNumber(dblResult);
}
else if (exp.StartsWith("\"") && exp.EndsWith("\"") || exp.StartsWith("\'") && exp.EndsWith("\'"))
{
returnObject = CreateString(exp.Remove(exp.Length - 1, 1).Remove(0, 1), true);
}
else if (exp.StartsWith("@\"") && exp.EndsWith("\"") || exp.StartsWith("@\'") && exp.EndsWith("\'"))
{
returnObject = CreateString(exp.Remove(exp.Length - 1, 1).Remove(0, 2), false);
}
else if (exp.StartsWith("{") && exp.EndsWith("}"))
{
returnObject = SProtoObject.Parse(this, exp);
}
else if (exp.StartsWith("[") && exp.EndsWith("]"))
{
returnObject = SArray.Parse(this, exp);
}
else if (exp.StartsWith("function") && Regex.IsMatch(exp, REGEX_FUNCTION))
{
returnObject = new SFunction(this, exp);
}
else if (Context.IsAPIUsing(exp))
{
returnObject = Context.GetAPIUsing(exp);
}
else if (Context.IsVariable(exp))
{
returnObject = Context.GetVariable(exp);
}
else if (Context.This.HasMember(this, exp))
{
returnObject = Context.This.GetMember(this, CreateString(exp), false);
}
else if (Context.IsPrototype(exp))
{
returnObject = Context.GetPrototype(exp);
}
else if (exp.StartsWith("new "))
{
returnObject = Context.CreateInstance(exp);
}
else if (exp.StartsWith("$"))
{
string strId = exp.Remove(0, 1);
int id = 0;
if (int.TryParse(strId, out id) && ObjectBuffer.HasObject(id))
{
returnObject = (SObject)ObjectBuffer.GetObject(id);
}
else
{
returnObject = ErrorHandler.ThrowError(ErrorType.SyntaxError, ErrorHandler.MESSAGE_SYNTAX_INVALID_TOKEN, new object[] { exp });
}
}
else
{
returnObject = ErrorHandler.ThrowError(ErrorType.ReferenceError, ErrorHandler.MESSAGE_REFERENCE_NOT_DEFINED, new object[] { exp });
}
if (isNegative)
returnObject = ObjectOperators.NegateNumber(this, returnObject);
return returnObject;
}