public Object Evaluate(
Context context,
Object what,
bool ignoreStar = false,
bool discardResults = false)
{
if (context.evaluationState != EvaluationState.Normal)
throw new ScriptError("Invalid Context", null);
if (context.callDepth >= context.maximumCallDepth)
{
context.RaiseNewError("Overflow.", null);
return null;
}
context.callDepth += 1; //All exit points must decrement depth.
if (what is String)
{
var r = EvaluateString(context, what as String, "", discardResults);
context.callDepth -= 1;
return r;
}
else if (!(what is ScriptObject))
{
context.callDepth -= 1;
return what;
}
var node = what as ScriptObject;
context.currentNode = node;
if (context.limitExecutionTime && (DateTime.Now - context.executionStart > context.allowedExecutionTime))
{
context.RaiseNewError("Timeout.", node);
context.callDepth -= 1;
return null;
}
if (node.gsp("@prefix") == "*" && !ignoreStar) //Object is a quoted node
{
context.callDepth -= 1;
return node;
}
var type = node.gsp("@type");
if (String.IsNullOrEmpty(type))
{
context.callDepth -= 1;
return node;
} //Object is not evaluatable code.
object result = null;
if (type == "string")
{
result = node["@token"];
}
else if (type == "stringexpression")
{
if (discardResults) //Don't bother assembling the string expression.
{
foreach (var piece in node._children)
{
if ((piece as ScriptObject).gsp("@type") == "string")
continue;
else
{
Evaluate(context, piece);
if (context.evaluationState != EvaluationState.Normal)
{
context.callDepth -= 1;
return null;
}
}
}
result = null;
}
else
{
if (node._children.Count == 1) //If there's only a single item, the result is that item.
{
result = Evaluate(context, node._child(0));
if (context.evaluationState != EvaluationState.Normal)
{
context.callDepth -= 1;
return null;
}
}
else
{
var resultString = String.Empty;
foreach (var piece in node._children)
{
resultString += ScriptObject.AsString(Evaluate(context, piece));
if (context.evaluationState != EvaluationState.Normal)
{
context.callDepth -= 1;
return null;
}
}
result = resultString;
}
}
}
else if (type == "token")
{
result = LookupToken(context, node.gsp("@token"));
if (context.evaluationState != EvaluationState.Normal)
{
context.callDepth -= 1;
return null;
}
}
else if (type == "memberaccess")
{
var lhs = Evaluate(context, node._child(0));
if (context.evaluationState != EvaluationState.Normal)
{ context.callDepth -= 1; return null; }
String rhs = "";
if ((node._child(1) as ScriptObject).gsp("@type") == "token")
rhs = (node._child(1) as ScriptObject).gsp("@token");
else
rhs = ScriptObject.AsString(Evaluate(context, node._child(1), false));
if (context.evaluationState != EvaluationState.Normal) { context.callDepth -= 1; return null; }
if (lhs == null) result = null;
else if (lhs is ScriptObject)
{
result = (lhs as ScriptObject).GetProperty(ScriptObject.AsString(rhs));
if (node.gsp("@token") == ":")
{
context.Scope.PushVariable("this", lhs);
result = Evaluate(context, result, true, false);
context.Scope.PopVariable("this");
if (context.evaluationState != EvaluationState.Normal)
{ context.callDepth -= 1; return null; }
}
}
else
{
var field = lhs.GetType().GetField(ScriptObject.AsString(rhs));
if (field != null)
result = field.GetValue(lhs);
else
{
var prop = lhs.GetType().GetProperty(ScriptObject.AsString(rhs));
if (prop != null)
result = prop.GetValue(lhs, null);
else
{
var members = lhs.GetType().FindMembers(System.Reflection.MemberTypes.Method,
System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance,
new System.Reflection.MemberFilter((minfo, obj) => { return minfo.Name == obj.ToString(); }),
ScriptObject.AsString(rhs));
if (members.Length != 0)
{
result = new GenericScriptObject(
"@lazy-reflection", ScriptObject.AsString(rhs),
"@source-object", lhs,
"@source-type", lhs.GetType());
}
else
result = null;
}
}
}
}
else if (type == "node")
{
if (!ignoreStar && node.gsp("@prefix") == "*")
{
result = node;
}
else
{
bool eval = node.gsp("@prefix") != "^";
var arguments = new ScriptList();
foreach (var child in node._children)
{
evaluateNodeChild(eval, child, arguments, context);
if (context.evaluationState != EvaluationState.Normal)
{
context.callDepth -= 1;
return null;
}
}
if (node.gsp("@prefix") == "^") result = arguments;
else
{
if (arguments.Count > 0 && Function.IsFunction(arguments[0] as ScriptObject))
{
result = Function.Invoke((arguments[0] as ScriptObject), this, context,
new ScriptList(arguments.GetRange(1, arguments.Count - 1)));
if (context.evaluationState != EvaluationState.Normal)
{
if (context.evaluationState == EvaluationState.UnwindingError)
context.PushStackTrace((arguments[0] as ScriptObject).gsp("@name"));
context.callDepth -= 1;
return null;
}
}
else if (arguments.Count > 0 &&
arguments[0] is ScriptObject &&
(arguments[0] as ScriptObject).GetProperty("@lazy-reflection") != null)
{
var sObj = arguments[0] as ScriptObject;
var argumentTypes = arguments.GetRange(1, arguments.Count - 1).Select(
(obj) => obj.GetType()).ToArray();
var sourceObject = sObj.GetProperty("@source-object");
var method = (sObj.GetProperty("@source-type") as System.Type)
.GetMethod(sObj.gsp("@lazy-reflection"), argumentTypes);
if (method == null)
throw new ScriptError("Could not find overload for " +
sObj.gsp("@lazy-reflection") + " that takes argument types " +
String.Join(", ", argumentTypes.Select((t) => t.Name)) + " on type " +
sObj.GetProperty("@source-type").ToString(), what as ScriptObject);
result = method.Invoke(sourceObject, arguments.GetRange(1, arguments.Count - 1).ToArray());
}
else if (arguments.Count > 0)
result = arguments[0];
else
result = null;
}
}
}
else if (type == "root")
{
var results = new ScriptList();
foreach (var child in node._children)
{
results.Add(Evaluate(context, child, false, false));
if (context.evaluationState != EvaluationState.Normal)
{
context.callDepth -= 1;
return null;
}
}
return results;
}
else if (type == "number")
{
try
{
if (node.gsp("@token").Contains('.')) result = Convert.ToSingle(node.gsp("@token"));
else result = Convert.ToInt32(node.gsp("@token"));
}
catch (Exception e)
{
context.RaiseNewError("Number format error.", node);
{ context.callDepth -= 1; return null; }
}
}
else if (type == "char")
{
context.callDepth -= 1;
return node.gsp("@token")[0];
}
else
{
context.RaiseNewError("Internal evaluator error.", node);
{ context.callDepth -= 1; return null; }
}
if (node.gsp("@prefix") == ":" && !ignoreStar)
result = Evaluate(context, result);
if (context.evaluationState != EvaluationState.Normal) { context.callDepth -= 1; return null; };
if (node.gsp("@prefix") == ".") result = LookupToken(context, ScriptObject.AsString(result));
context.callDepth -= 1;
return result;
}
public Object Evaluate(
Context context,
Object what,
bool ignoreStar = false,
bool discardResults = false)
{
if (context.evaluationState != EvaluationState.Normal)
{
throw new ScriptError("Invalid Context", null);
}
if (context.callDepth >= context.maximumCallDepth)
{
context.RaiseNewError("Overflow.", null);
return(null);
}
context.callDepth += 1; //All exit points must decrement depth.
if (what is String)
{
var r = EvaluateString(context, what as String, "", discardResults);
context.callDepth -= 1;
return(r);
}
else if (!(what is ScriptObject))
{
context.callDepth -= 1;
return(what);
}
var node = what as ScriptObject;
context.currentNode = node;
if (context.limitExecutionTime && (DateTime.Now - context.executionStart > context.allowedExecutionTime))
{
context.RaiseNewError("Timeout.", node);
context.callDepth -= 1;
return(null);
}
if (node.gsp("@prefix") == "*" && !ignoreStar) //Object is a quoted node
{
context.callDepth -= 1;
return(node);
}
var type = node.gsp("@type");
if (String.IsNullOrEmpty(type))
{
context.callDepth -= 1;
return(node);
} //Object is not evaluatable code.
object result = null;
if (type == "string")
{
result = node["@token"];
}
else if (type == "stringexpression")
{
if (discardResults) //Don't bother assembling the string expression.
{
foreach (var piece in node._children)
{
if ((piece as ScriptObject).gsp("@type") == "string")
{
continue;
}
else
{
Evaluate(context, piece);
if (context.evaluationState != EvaluationState.Normal)
{
context.callDepth -= 1;
return(null);
}
}
}
result = null;
}
else
{
if (node._children.Count == 1) //If there's only a single item, the result is that item.
{
result = Evaluate(context, node._child(0));
if (context.evaluationState != EvaluationState.Normal)
{
context.callDepth -= 1;
return(null);
}
}
else
{
var resultString = String.Empty;
foreach (var piece in node._children)
{
resultString += ScriptObject.AsString(Evaluate(context, piece));
if (context.evaluationState != EvaluationState.Normal)
{
context.callDepth -= 1;
return(null);
}
}
result = resultString;
}
}
}
else if (type == "token")
{
result = LookupToken(context, node.gsp("@token"));
if (context.evaluationState != EvaluationState.Normal)
{
context.callDepth -= 1;
return(null);
}
}
else if (type == "memberaccess")
{
var lhs = Evaluate(context, node._child(0));
if (context.evaluationState != EvaluationState.Normal)
{
context.callDepth -= 1; return(null);
}
String rhs = "";
if ((node._child(1) as ScriptObject).gsp("@type") == "token")
{
rhs = (node._child(1) as ScriptObject).gsp("@token");
}
else
{
rhs = ScriptObject.AsString(Evaluate(context, node._child(1), false));
}
if (context.evaluationState != EvaluationState.Normal)
{
context.callDepth -= 1; return(null);
}
if (lhs == null)
{
result = null;
}
else if (lhs is ScriptObject)
{
result = (lhs as ScriptObject).GetProperty(ScriptObject.AsString(rhs));
if (node.gsp("@token") == ":")
{
context.Scope.PushVariable("this", lhs);
result = Evaluate(context, result, true, false);
context.Scope.PopVariable("this");
if (context.evaluationState != EvaluationState.Normal)
{
context.callDepth -= 1; return(null);
}
}
}
else
{
var field = lhs.GetType().GetField(ScriptObject.AsString(rhs));
if (field != null)
{
result = field.GetValue(lhs);
}
else
{
var prop = lhs.GetType().GetProperty(ScriptObject.AsString(rhs));
if (prop != null)
{
result = prop.GetValue(lhs, null);
}
else
{
var members = lhs.GetType().FindMembers(System.Reflection.MemberTypes.Method,
System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance,
new System.Reflection.MemberFilter((minfo, obj) => { return(minfo.Name == obj.ToString()); }),
ScriptObject.AsString(rhs));
if (members.Length != 0)
{
result = new GenericScriptObject(
"@lazy-reflection", ScriptObject.AsString(rhs),
"@source-object", lhs,
"@source-type", lhs.GetType());
}
else
{
result = null;
}
}
}
}
}
else if (type == "node")
{
if (!ignoreStar && node.gsp("@prefix") == "*")
{
result = node;
}
else
{
bool eval = node.gsp("@prefix") != "^";
var arguments = new ScriptList();
foreach (var child in node._children)
{
evaluateNodeChild(eval, child, arguments, context);
if (context.evaluationState != EvaluationState.Normal)
{
context.callDepth -= 1;
return(null);
}
}
if (node.gsp("@prefix") == "^")
{
result = arguments;
}
else
{
if (arguments.Count > 0 && Function.IsFunction(arguments[0] as ScriptObject))
{
result = Function.Invoke((arguments[0] as ScriptObject), this, context,
new ScriptList(arguments.GetRange(1, arguments.Count - 1)));
if (context.evaluationState != EvaluationState.Normal)
{
if (context.evaluationState == EvaluationState.UnwindingError)
{
context.PushStackTrace((arguments[0] as ScriptObject).gsp("@name"));
}
context.callDepth -= 1;
return(null);
}
}
else if (arguments.Count > 0 &&
arguments[0] is ScriptObject &&
(arguments[0] as ScriptObject).GetProperty("@lazy-reflection") != null)
{
var sObj = arguments[0] as ScriptObject;
var argumentTypes = arguments.GetRange(1, arguments.Count - 1).Select(
(obj) => obj.GetType()).ToArray();
var sourceObject = sObj.GetProperty("@source-object");
var method = (sObj.GetProperty("@source-type") as System.Type)
.GetMethod(sObj.gsp("@lazy-reflection"), argumentTypes);
if (method == null)
{
throw new ScriptError("Could not find overload for " +
sObj.gsp("@lazy-reflection") + " that takes argument types " +
String.Join(", ", argumentTypes.Select((t) => t.Name)) + " on type " +
sObj.GetProperty("@source-type").ToString(), what as ScriptObject);
}
result = method.Invoke(sourceObject, arguments.GetRange(1, arguments.Count - 1).ToArray());
}
else if (arguments.Count > 0)
{
result = arguments[0];
}
else
{
result = null;
}
}
}
}
else if (type == "root")
{
var results = new ScriptList();
foreach (var child in node._children)
{
results.Add(Evaluate(context, child, false, false));
if (context.evaluationState != EvaluationState.Normal)
{
context.callDepth -= 1;
return(null);
}
}
return(results);
}
else if (type == "number")
{
try
{
if (node.gsp("@token").Contains('.'))
{
result = Convert.ToSingle(node.gsp("@token"));
}
else
{
var numberString = node.gsp("@token");
if (numberString.StartsWith("0x"))
{
result = Convert.ToInt32(numberString.Substring(2), 16);
}
else if (numberString.StartsWith("0b"))
{
var accumulator = 0;
foreach (var c in numberString.Substring(2))
{
accumulator <<= 1;
if (c == '1')
{
accumulator += 1;
}
}
result = accumulator;
}
else
{
result = Int32.Parse(numberString);
}
}
}
catch (Exception e)
{
context.RaiseNewError("Number format error.", node);
{ context.callDepth -= 1; return(null); }
}
}
else if (type == "char")
{
context.callDepth -= 1;
return(node.gsp("@token")[0]);
}
else
{
context.RaiseNewError("Internal evaluator error.", node);
{ context.callDepth -= 1; return(null); }
}
if (node.gsp("@prefix") == ":" && !ignoreStar)
{
result = Evaluate(context, result);
}
if (context.evaluationState != EvaluationState.Normal)
{
context.callDepth -= 1; return(null);
}
;
if (node.gsp("@prefix") == ".")
{
result = LookupToken(context, ScriptObject.AsString(result));
}
context.callDepth -= 1;
return(result);
}
