public static ScriptObject ParseChar(ParseState state)
{
var result = new GenericScriptObject("@type", "char", "@start", state.start, "@source", state);
var token = "";
state.Advance(); //skip opening '
while (!state.AtEnd())
{
if (state.Next() == '\\')
{
state.Advance();
if (state.Next() == 'n') token += "\n";
if (state.Next() == 't') token += "\t";
if (state.Next() == 'r') token += "\r";
else token += state.Next();
}
else if (state.Next() == '\'')
{
result["@end"] = state.start;
result["@token"] = token;
state.Advance();
return result;
}
else
{
token += state.Next();
state.Advance();
}
}
result["@end"] = state.start;
result["@token"] = token;
return result;
}
public static GenericScriptObject BindXNAMath()
{
var xna = new GenericScriptObject();
xna.SetProperty("v", Function.MakeSystemFunction("Vector3",
Arguments.Args("x", "y", "z", Arguments.Optional("w")), "Create a new vector.",
(context, arguments) =>
{
if (arguments[3] == null)
return new Vector3(AutoBind.NumericArgument(arguments[0]),
AutoBind.NumericArgument(arguments[1]),
AutoBind.NumericArgument(arguments[2]));
else
return new Vector4(AutoBind.NumericArgument(arguments[0]),
AutoBind.NumericArgument(arguments[1]),
AutoBind.NumericArgument(arguments[2]),
AutoBind.NumericArgument(arguments[3]));
}));
xna.SetProperty("helper", AutoBind.GenerateLazyBindingObjectForStaticLibrary(typeof(MathHelper)));
xna.SetProperty("matrix", AutoBind.GenerateLazyBindingObjectForStaticLibrary(typeof(Matrix)));
xna.SetProperty("quat", AutoBind.GenerateLazyBindingObjectForStaticLibrary(typeof(Quaternion)));
xna.SetProperty("v2", AutoBind.GenerateLazyBindingObjectForStaticLibrary(typeof(Vector2), true));
xna.SetProperty("v3", AutoBind.GenerateLazyBindingObjectForStaticLibrary(typeof(Vector3), true));
xna.SetProperty("v4", AutoBind.GenerateLazyBindingObjectForStaticLibrary(typeof(Vector4), true));
xna.SetProperty("rect", AutoBind.GenerateLazyBindingObjectForStaticLibrary(typeof(Rectangle), true));
return xna;
}
public static ScriptObject GenerateTypeBinding(System.Type type)
{
var r = new GenericScriptObject();
r.SetProperty("@construct", Function.MakeSystemFunction("@construct",
Arguments.Args(Arguments.Optional(Arguments.Repeat("argument"))),
"Create a new instance of " + type.Name,
(context, arguments) =>
{
return(Activator.CreateInstance(type, (arguments[0] as ScriptList).ToArray()));
}));
foreach (var method in type.GetMethods())
{
if (method.IsPublic)
{
r.SetProperty(method.Name, GenerateMethodBinding(method));
}
}
return(r);
}
public static MISP.GenericScriptObject GenerateBinding()
{
var gui = new MISP.GenericScriptObject();
gui["create"] = MISP.Function.MakeSystemFunction("create", MISP.Arguments.Args(
MISP.Arguments.Arg("type"), Arguments.Arg("rect"), Arguments.Arg("settings"), Arguments.Optional("hover")),
"Create a ui element.",
(context, arguments) =>
{
var type = ScriptObject.AsString(arguments[0]);
var rect = arguments[1] as Rectangle?;
if (rect == null || !rect.HasValue) throw new InvalidOperationException("Second argument must be a rect.");
UIItem result = null;
if (type == "item") result = new UIItem(rect.Value);
else if (type == "slider") result = new VerticalSlider(rect.Value);
else throw new InvalidOperationException("Unknown element type.");
result.settings = arguments[2] as ScriptObject;
result.hoverSettings = arguments[3] as ScriptObject;
return result;
});
return gui;
}
public static ScriptObject GenerateLazyBindingObjectForStaticLibrary(System.Type type, bool generateConstructor = false)
{
var r = new GenericScriptObject();
if (generateConstructor)
{
r.SetProperty("@construct", Function.MakeSystemFunction("@construct",
Arguments.Args(Arguments.Optional(Arguments.Repeat("argument"))),
"Create a new instance of " + type.Name,
(context, arguments) =>
{
return(Activator.CreateInstance(type, (arguments[0] as ScriptList).ToArray()));
}));
}
foreach (var method in type.GetMethods())
{
if (method.IsPublic && method.IsStatic)
{
r.SetProperty(TransformMethodName(method.Name), LazyBindStaticMethod(type, method.Name));
}
}
return(r);
}
public static ScriptObject ReorderMemberAccessNode(ScriptObject node)
{
//Convert (A (B (C D))) to (((A B) C) D)
//Create an (A B C D) list.
var nodeList = new LinkedList<AccessChainNode>();
for (var n = node; n != null; n = (isType(n, "memberaccess") ? child(n,1) as ScriptObject : null))
{
if (isType(n, "memberaccess"))
nodeList.AddLast(new AccessChainNode { node = child(n,0), token = n["@token"] });
else
nodeList.AddLast(new AccessChainNode { node = n, token = "" });
}
//Each iteration, take the first two nodes and combine them into a new member access node.
//(A B C D) becomes ((A B) C D), etc.
while (nodeList.Count > 1)
{
var lhs = nodeList.First();
nodeList.RemoveFirst();
var rhs = nodeList.First();
nodeList.RemoveFirst();
var newNode = new GenericScriptObject("@type", "memberaccess", "@start", (lhs.node as ScriptObject)["@start"],
"@source", (lhs.node as ScriptObject)["@source"]);
newNode["@token"] = lhs.token;
children(newNode).Add(lhs.node);
children(newNode).Add(rhs.node);
nodeList.AddFirst(new AccessChainNode
{
node = newNode,
token = rhs.token
});
}
return nodeList.First().node as ScriptObject;
}
public static ScriptObject ParseToken(ParseState state)
{
var result = new GenericScriptObject("@type", "token", "@start", state.start, "@source", state);
while (!state.AtEnd() && !(" \t\r\n:.)]}".Contains(state.Next()))) state.Advance();
result["@end"] = state.start;
result["@token"] = state.source.Substring(asInt(result["@start"]),
asInt(result["@end"]) - asInt(result["@start"]));
if (String.IsNullOrEmpty(result.gsp("@token"))) throw new ParseError("Empty token", state.currentLine);
return result;
}
public static ScriptObject ParseStringExpression(ParseState state, bool isRoot = false)
{
var result = new GenericScriptObject("@type", "stringexpression", "@start", state.start, "@source", state);
if (!isRoot) state.Advance(); //Skip opening quote
string piece = "";
int piece_start = state.start;
while (!state.AtEnd())
{
if (state.Next() == '}' && piece.Length == 0)
{
state.Advance(1);
}
else if (state.Next() == '(')
{
if (piece.Length > 0) children(result).Add(
new GenericScriptObject("@type", "string", "@start", piece_start, "@source", state,
"@token", state.source.Substring(piece_start, state.start - piece_start)));
children(result).Add(ParseNode(state));
piece = "";
}
else if (state.Next() == '\\')
{
if (piece.Length == 0) piece_start = state.start;
state.Advance(); //skip the slash.
piece += state.Next();
state.Advance();
}
else if (!isRoot && state.Next() == '"')
{
if (piece.Length > 0) children(result).Add(
new GenericScriptObject("@type", "string", "@start", piece_start, "@source", state,
"@token", state.source.Substring(piece_start, state.start - piece_start)));
state.Advance();
result["@end"] = state.start;
if (children(result).Count == 1 && isType(children(result)[0] as ScriptObject, "string"))
return child(result, 0) as ScriptObject;
return result;
}
else
{
if (piece.Length == 0) piece_start = state.start;
piece += state.Next();
state.Advance();
}
}
if (isRoot)
{
if (piece.Length > 0) children(result).Add(new GenericScriptObject("@type", "string", "@start", piece_start,
"@source", state, "@token", state.source.Substring(piece_start, state.start - piece_start)));
if (children(result).Count == 1) return child(result, 0) as ScriptObject;
return result;
}
throw new ParseError("Unexpected end of script inside string expression.", state.currentLine);
}
public static ScriptObject ParseNumber(ParseState state)
{
var result = new GenericScriptObject("@type", "number", "@start", state.start, "@source", state);
bool foundDot = false;
while (!state.AtEnd())
{
if (state.Next() == '-')
{
if (asInt(result["@start"]) != state.start) break;
state.Advance();
continue;
}
if (state.Next() >= '0' && state.Next() <= '9')
{
state.Advance();
continue;
}
else if (state.Next() == '.')
{
if (foundDot) break;
foundDot = true;
state.Advance();
continue;
}
break;
}
result["@end"] = state.start;
result["@token"] = state.source.Substring(asInt(result["@start"]), asInt(result["@end"]) - asInt(result["@start"]));
return result;
}
public static ScriptObject ParseNode(ParseState state, String start = "(", String end = ")")
{
var result = new GenericScriptObject("@type", "node", "@start", state.start, "@source", state);
if (!state.MatchNext(start)) throw new ParseError("Expected " + start, state.currentLine);
state.Advance(start.Length);
while (!state.AtEnd() && !state.MatchNext(end))
{
DevourWhitespace(state);
if (state.Next() == '}')
return result;
if (!state.AtEnd() && !state.MatchNext(end))
{
var expression = ParseExpression(state);
if (isType(expression, "memberaccess")) expression = ReorderMemberAccessNode(expression);
children(result).Add(expression);
}
DevourWhitespace(state);
}
if (end != null) state.Advance(end.Length);
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);
}
private void SetupObjectFunctions()
{
AddFunction("members", "Lists all members of an object",
(context, arguments) =>
{
var obj = ArgumentType<ScriptObject>(arguments[0]);
return obj.ListProperties();
},
Arguments.Arg("object"));
AddFunction("record", "Create a new record.",
(context, arguments) =>
{
var obj = new GenericScriptObject();
var vars = AutoBind.ListArgument(arguments[0]);
foreach (var item in vars)
{
var l = ArgumentType<ScriptObject>(item);
if (l == null || l._children.Count != 2)
throw new ScriptError("Record expects a list of pairs.", null);
var arg = l._child(0) as ScriptObject;
string mname = "";
if (arg != null && arg.gsp("@type") == "token") mname = arg.gsp("@token");
else mname = Evaluate(context, arg, true).ToString();
obj.SetProperty(mname, Evaluate(context, l._child(1)));
}
return obj;
},
Arguments.Repeat(Arguments.Lazy("pairs")));
AddFunction("clone", "Clone a record.",
(context, arguments) =>
{
var r = new GenericScriptObject(arguments[0] as ScriptObject);
foreach (var item in arguments[1] as ScriptList)
{
var list = item as ScriptList;
if (list == null || list.Count != 2) throw new ScriptError("Record expects only pairs as arguments.", context.currentNode);
r[ScriptObject.AsString(list[0])] = list[1];
}
return r;
},
Arguments.Arg("object"),
Arguments.Mutator(Arguments.Repeat(Arguments.Optional("pairs")), "(@list value)"));
AddFunction("set", "Set a member on an object.",
(context, arguments) =>
{
if (arguments[0] == null) return arguments[2];
return SetObjectProperty(context, arguments[0], ScriptObject.AsString(arguments[1]), arguments[2]);
},
Arguments.Arg("object"),
Arguments.Mutator(Arguments.Lazy("name"), "(@identifier-if-token value)"),
Arguments.Arg("value"));
AddFunction("multi-set", "Set multiple members of an object.",
(context, arguments) =>
{
var obj = ArgumentType<ScriptObject>(arguments[0]);
var vars = AutoBind.ListArgument(arguments[1]);
foreach (var item in vars)
{
var l = ArgumentType<ScriptObject>(item);
if (l == null || l._children.Count != 2) throw new ScriptError("Multi-set expects a list of pairs.", null);
var arg = l._child(0) as ScriptObject;
string mname = "";
if (arg != null && arg.gsp("@type") == "token") mname = arg.gsp("@token");
else mname = Evaluate(context, arg, true).ToString();
SetObjectProperty(context, obj, mname, Evaluate(context, l._child(1)));
}
return obj;
},
Arguments.Arg("object"),
Arguments.Repeat(Arguments.Lazy("pairs")));
AddFunction("delete", "Deletes a property from an object.",
(context, arguments) =>
{
var value = (arguments[0] as ScriptObject)[ScriptObject.AsString(arguments[1])];
if (arguments[0] is Scope)
(arguments[0] as Scope).PopVariable(ScriptObject.AsString(arguments[1]));
else
(arguments[0] as ScriptObject).DeleteProperty(ScriptObject.AsString(arguments[1]));
return value;
},
Arguments.Arg("object"),
Arguments.Arg("property-name"));
}
public static ScriptObject ParseExpression(ParseState state)
{
ScriptObject result = null;
var prefix = ParsePrefix(state);
if (state.Next() == '"')
{
if (prefix == "$")
{
prefix = "";
result = ParseBasicString(state);
}
else
{
result = ParseStringExpression(state);
}
}
else if (state.Next() == '(')
{
result = ParseNode(state);
}
else if (state.Next() == '\'')
{
result = ParseChar(state);
}
else if ("-0123456789".Contains(state.Next()))
{
result = ParseNumber(state);
if (result["@token"].ToString() == "-") //A lone - sign is not a valid number. Interpret it as a token.
{
result["@type"] = "token";
}
}
else
{
if (" \t\r\n:.)}".Contains(state.Next()) &&
!String.IsNullOrEmpty(prefix))
{
//The prefix is a token.
result = new GenericScriptObject("@type", "token", "@start", state.start - 1, "@source", state);
result["@end"] = state.start;
result["@token"] = prefix;
prefix = "";
}
else
{
result = ParseToken(state);
}
}
if (!state.AtEnd() && (state.Next() == '.' || state.Next() == ':'))
{
var final_result = new GenericScriptObject("@type", "memberaccess", "@start", result["@start"],
"@source", state);
children(final_result).Add(result);
final_result["@token"] = new String(state.Next(), 1);
state.Advance();
children(final_result).Add(ParseExpression(state));
result = final_result;
}
result["@prefix"] = prefix;
if (!PrefixCheck.CheckPrefix(result))
{
throw new ParseError("Illegal prefix on expression of type " + result["@type"], state.currentLine);
}
return(result);
}
private void SetupFileFunctions()
{
var file_functions = new GenericScriptObject();
file_functions.SetProperty("open", Function.MakeSystemFunction("open",
Arguments.Args("file-name", "mode"), "Opens a file",
(context, arguments) =>
{
var mode = AutoBind.StringArgument(arguments[1]).ToUpperInvariant();
if (mode == "READ")
return System.IO.File.OpenText(AutoBind.StringArgument(arguments[0]));
else if (mode == "WRITE")
return System.IO.File.CreateText(AutoBind.StringArgument(arguments[0]));
else if (mode == "APPEND")
return System.IO.File.AppendText(AutoBind.StringArgument(arguments[0]));
else
context.RaiseNewError("Invalid mode specifier", context.currentNode);
return null;
}));
file_functions.SetProperty("close", Function.MakeSystemFunction("close",
Arguments.Args("file"), "Close a file.",
(context, arguments) =>
{
if (arguments[0] is System.IO.StreamReader) (arguments[0] as System.IO.StreamReader).Close();
else if (arguments[0] is System.IO.StreamWriter) (arguments[0] as System.IO.StreamWriter).Close();
else context.RaiseNewError("Argument is not a file.", context.currentNode);
return null;
}));
file_functions.SetProperty("read-line", Function.MakeSystemFunction("read-line",
Arguments.Args("file"), "Read a line from a file.",
(context, arguments) =>
{
var file = arguments[0] as System.IO.StreamReader;
if (file == null)
{
context.RaiseNewError("Argument is not a read file.", context.currentNode);
return null;
}
return file.ReadLine();
}));
file_functions.SetProperty("read-all", Function.MakeSystemFunction("read-all",
Arguments.Args("file"), "Read all of a file.",
(context, arguments) =>
{
var file = arguments[0] as System.IO.StreamReader;
if (file == null)
{
context.RaiseNewError("Argument is not a read file.", context.currentNode);
return null;
}
return file.ReadToEnd();
}));
file_functions.SetProperty("write", Function.MakeSystemFunction("write",
Arguments.Args("file", "text"), "Write to a file.",
(context, arguments) =>
{
var file = arguments[0] as System.IO.StreamWriter;
if (file == null)
{
context.RaiseNewError("Argument is not a write file.", context.currentNode);
return null;
}
file.Write(ScriptObject.AsString(arguments[1]));
return null;
}));
file_functions.SetProperty("more", Function.MakeSystemFunction("more",
Arguments.Args("file"), "Is there more to read in this file?",
(context, arguments) =>
{
var file = arguments[0] as System.IO.StreamReader;
if (file == null)
{
context.RaiseNewError("Argument is not a read file.", context.currentNode);
return null;
}
if (file.EndOfStream) return null;
return true;
}));
AddGlobalVariable("file", c => file_functions);
}
private void SetupFileFunctions()
{
var file_functions = new GenericScriptObject();
file_functions.SetProperty("open", Function.MakeSystemFunction("open",
Arguments.Args("file-name", "mode"), "Opens a file",
(context, arguments) =>
{
var mode = AutoBind.StringArgument(arguments[1]).ToUpperInvariant();
if (mode == "READ")
{
return(System.IO.File.OpenText(AutoBind.StringArgument(arguments[0])));
}
else if (mode == "WRITE")
{
return(System.IO.File.CreateText(AutoBind.StringArgument(arguments[0])));
}
else if (mode == "APPEND")
{
return(System.IO.File.AppendText(AutoBind.StringArgument(arguments[0])));
}
else
{
context.RaiseNewError("Invalid mode specifier", context.currentNode);
}
return(null);
}));
file_functions.SetProperty("close", Function.MakeSystemFunction("close",
Arguments.Args("file"), "Close a file.",
(context, arguments) =>
{
if (arguments[0] is System.IO.StreamReader)
{
(arguments[0] as System.IO.StreamReader).Close();
}
else if (arguments[0] is System.IO.StreamWriter)
{
(arguments[0] as System.IO.StreamWriter).Close();
}
else
{
context.RaiseNewError("Argument is not a file.", context.currentNode);
}
return(null);
}));
file_functions.SetProperty("read-line", Function.MakeSystemFunction("read-line",
Arguments.Args("file"), "Read a line from a file.",
(context, arguments) =>
{
var file = arguments[0] as System.IO.StreamReader;
if (file == null)
{
context.RaiseNewError("Argument is not a read file.", context.currentNode);
return(null);
}
return(file.ReadLine());
}));
file_functions.SetProperty("read-all", Function.MakeSystemFunction("read-all",
Arguments.Args("file"), "Read all of a file.",
(context, arguments) =>
{
var file = arguments[0] as System.IO.StreamReader;
if (file == null)
{
context.RaiseNewError("Argument is not a read file.", context.currentNode);
return(null);
}
return(file.ReadToEnd());
}));
file_functions.SetProperty("write", Function.MakeSystemFunction("write",
Arguments.Args("file", "text"), "Write to a file.",
(context, arguments) =>
{
var file = arguments[0] as System.IO.StreamWriter;
if (file == null)
{
context.RaiseNewError("Argument is not a write file.", context.currentNode);
return(null);
}
file.Write(ScriptObject.AsString(arguments[1]));
return(null);
}));
file_functions.SetProperty("more", Function.MakeSystemFunction("more",
Arguments.Args("file"), "Is there more to read in this file?",
(context, arguments) =>
{
var file = arguments[0] as System.IO.StreamReader;
if (file == null)
{
context.RaiseNewError("Argument is not a read file.", context.currentNode);
return(null);
}
if (file.EndOfStream)
{
return(null);
}
return(true);
}));
AddGlobalVariable("file", c => file_functions);
}
public static ScriptObject ParseExpression(ParseState state)
{
ScriptObject result = null;
var prefix = ParsePrefix(state);
if (state.Next() == '"')
{
result = ParseStringExpression(state);
}
else if (state.Next() == '(')
{
result = ParseNode(state);
}
else if (state.Next() == '\'')
{
result = ParseChar(state);
}
else if ("-0123456789".Contains(state.Next()))
{
result = ParseNumber(state);
if (result["@token"].ToString() == "-") //A lone - sign is not a valid number. Interpret it as a token.
result["@type"] = "token";
}
else
{
if (" \t\r\n:.)}".Contains(state.Next())
&& !String.IsNullOrEmpty(prefix))
{
//The prefix is a token.
result = new GenericScriptObject("@type", "token", "@start", state.start - 1, "@source", state);
result["@end"] = state.start;
result["@token"] = prefix;
prefix = "";
}
else
result = ParseToken(state);
}
if (!state.AtEnd() && (state.Next() == '.' || state.Next() == ':'))
{
var final_result = new GenericScriptObject("@type", "memberaccess", "@start", result["@start"],
"@source", state);
children(final_result).Add(result);
final_result["@token"] = new String(state.Next(), 1);
state.Advance();
children(final_result).Add(ParseExpression(state));
result = final_result;
}
result["@prefix"] = prefix;
if (!PrefixCheck.CheckPrefix(result))
throw new ParseError("Illegal prefix on expression of type " + result["@type"], state.currentLine);
return result;
}
public static ScriptObject ParseStringExpression(ParseState state, bool isRoot = false)
{
var result = new GenericScriptObject("@type", "stringexpression", "@start", state.start, "@source", state);
if (!isRoot)
{
state.Advance(); //Skip opening quote
}
string piece = "";
int piece_start = state.start;
while (!state.AtEnd())
{
if (state.Next() == '}' && piece.Length == 0)
{
state.Advance(1);
}
else if (state.Next() == '(')
{
if (piece.Length > 0)
{
children(result).Add(
new GenericScriptObject("@type", "string", "@start", piece_start, "@source", state,
"@token", state.source.Substring(piece_start, state.start - piece_start)));
}
children(result).Add(ParseNode(state));
piece = "";
}
else if (state.Next() == '\\')
{
if (piece.Length == 0)
{
piece_start = state.start;
}
state.Advance(); //skip the slash.
piece += state.Next();
state.Advance();
}
else if (!isRoot && state.Next() == '"')
{
if (piece.Length > 0)
{
children(result).Add(
new GenericScriptObject("@type", "string", "@start", piece_start, "@source", state,
"@token", state.source.Substring(piece_start, state.start - piece_start)));
}
state.Advance();
result["@end"] = state.start;
if (children(result).Count == 1 && isType(children(result)[0] as ScriptObject, "string"))
{
return(child(result, 0) as ScriptObject);
}
return(result);
}
else
{
if (piece.Length == 0)
{
piece_start = state.start;
}
piece += state.Next();
state.Advance();
}
}
if (isRoot)
{
if (piece.Length > 0)
{
children(result).Add(new GenericScriptObject("@type", "string", "@start", piece_start,
"@source", state, "@token", state.source.Substring(piece_start, state.start - piece_start)));
}
if (children(result).Count == 1)
{
return(child(result, 0) as ScriptObject);
}
return(result);
}
throw new ParseError("Unexpected end of script inside string expression.", state.currentLine);
}
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;
}
private void SetupObjectFunctions()
{
AddFunction("members", "Lists all members of an object",
(context, arguments) =>
{
var obj = ArgumentType <ScriptObject>(arguments[0]);
return(obj.ListProperties());
},
Arguments.Arg("object"));
AddFunction("record", "Create a new record.",
(context, arguments) =>
{
var obj = new GenericScriptObject();
var vars = AutoBind.ListArgument(arguments[0]);
foreach (var item in vars)
{
var l = ArgumentType <ScriptObject>(item);
if (l == null || l._children.Count != 2)
{
throw new ScriptError("Record expects a list of pairs.", null);
}
var arg = l._child(0) as ScriptObject;
string mname = "";
if (arg != null && arg.gsp("@type") == "token")
{
mname = arg.gsp("@token");
}
else
{
mname = Evaluate(context, arg, true).ToString();
}
obj.SetProperty(mname, Evaluate(context, l._child(1)));
}
return(obj);
},
Arguments.Repeat(Arguments.Lazy("pairs")));
AddFunction("clone", "Clone a record.",
(context, arguments) =>
{
var r = new GenericScriptObject(arguments[0] as ScriptObject);
foreach (var item in arguments[1] as ScriptList)
{
var list = item as ScriptList;
if (list == null || list.Count != 2)
{
throw new ScriptError("Record expects only pairs as arguments.", context.currentNode);
}
r[ScriptObject.AsString(list[0])] = list[1];
}
return(r);
},
Arguments.Arg("object"),
Arguments.Mutator(Arguments.Repeat(Arguments.Optional("pairs")), "(@list value)"));
AddFunction("set", "Set a member on an object.",
(context, arguments) =>
{
if (arguments[0] == null)
{
return(arguments[2]);
}
return(SetObjectProperty(context, arguments[0], ScriptObject.AsString(arguments[1]), arguments[2]));
},
Arguments.Arg("object"),
Arguments.Mutator(Arguments.Lazy("name"), "(@identifier-if-token value)"),
Arguments.Arg("value"));
AddFunction("multi-set", "Set multiple members of an object.",
(context, arguments) =>
{
var obj = ArgumentType <ScriptObject>(arguments[0]);
var vars = AutoBind.ListArgument(arguments[1]);
foreach (var item in vars)
{
var l = ArgumentType <ScriptObject>(item);
if (l == null || l._children.Count != 2)
{
throw new ScriptError("Multi-set expects a list of pairs.", null);
}
var arg = l._child(0) as ScriptObject;
string mname = "";
if (arg != null && arg.gsp("@type") == "token")
{
mname = arg.gsp("@token");
}
else
{
mname = Evaluate(context, arg, true).ToString();
}
SetObjectProperty(context, obj, mname, Evaluate(context, l._child(1)));
}
return(obj);
},
Arguments.Arg("object"),
Arguments.Repeat(Arguments.Lazy("pairs")));
AddFunction("delete", "Deletes a property from an object.",
(context, arguments) =>
{
var value = (arguments[0] as ScriptObject)[ScriptObject.AsString(arguments[1])];
if (arguments[0] is Scope)
{
(arguments[0] as Scope).PopVariable(ScriptObject.AsString(arguments[1]));
}
else
{
(arguments[0] as ScriptObject).DeleteProperty(ScriptObject.AsString(arguments[1]));
}
return(value);
},
Arguments.Arg("object"),
Arguments.Arg("property-name"));
}