// This is for function calls, both regular calls and class member calls.
public void Set(int depth, string name, TypeDef_Function funcType, ClassValue classInstance, bool isStaticIn)
{
_varStackStart = depth;
_name = "function call (" + name + ")";
_terminal = true;
_hardTerminal = false;
_classInstance = classInstance;
_classDef = null;
_funcType = funcType;
_isStatic = isStaticIn;
}
// ATM, this is only used by Exec.
public void SetHardTerminal(int depth, string name = "<hardTerminal>")
{
_varStackStart = depth;
_name = "hardTerminal";
_terminal = true;
_hardTerminal = true;
_classInstance = null;
_classDef = null;
_funcType = null;
_isStatic = false;
}
// This is for static function calls, or for class member function calls during typecheck
// when we don't have or need an instance.
public void Set(int depth, TypeDef_Function funcType, ClassDef classDef, bool isStaticIn)
{
_varStackStart = depth;
_name = "class (" + classDef.name + ")";
_terminal = true;
_hardTerminal = false;
_classInstance = null;
_classDef = classDef;
_funcType = funcType;
_isStatic = isStaticIn;
}
// This is for non-terminal blocks: for, if, and expr-lists. NOT fuction calls.
public void Set(int depth, string name = "<scope>")
{
_varStackStart = depth;
_name = name;
_terminal = false;
_hardTerminal = false;
_classInstance = null;
_classDef = null;
_funcType = null;
_isStatic = false;
}
// Terminal should be true in the "usual" case, which seems to be class member
// functions. Should be false in the case of defstructors, because those aren't
// real functions and thus not closures: they're just little blocks of code
// inside the surrounding code that have access to class members.
public void Set(int depth, ClassValue classInstance, bool terminalIn = true)
{
_varStackStart = depth;
_name = "class (" + classInstance.classDef.name + ")";
_terminal = terminalIn;
_hardTerminal = false;
_classInstance = classInstance;
_classDef = null;
_funcType = null;
_isStatic = false;
}
public virtual object GetDefaultValue(ExecContext context)
{
string name = GetName();
ClassDef parent = context.GetClass(name);
ClassValue result = parent.Allocate(context);
if (null == result)
{
return(null);
}
result.debugName = parent.name + " Inst";
//result.typeDef = this;
return(result);
}
public bool PushClassScope(ClassValue instance, ExecContext context, string msg = "")
{
if (CALLSTACKMAXDEPTH == _callCount)
{
return(false);
}
_callStack[_callCount].Set(_varCount, instance, true);
++_callCount;
#if PEBBLE_TRACESTACK
TraceScope("PushClassScope");
#endif
return(true);
}
public bool PushDefstructorScope(ClassValue instance, ExecContext context)
{
Pb.Assert(_callCount < CALLSTACKMAXDEPTH);
if (CALLSTACKMAXDEPTH == _callCount)
{
return(false);
}
#if PEBBLE_TRACESTACK
TraceLog("PushDefstructorScope " + instance.classDef.name + " '" + instance.debugName + "'");
#endif
_callStack[_callCount].Set(_varCount, instance, false);
++_callCount;
return(true);
}
public bool PushCall(TypeDef_Function funcType, string funcName, ClassValue instance, bool isStatic, ExecContext context)
{
if (CALLSTACKMAXDEPTH == _callCount)
{
return(false);
}
_callStack[_callCount].Set(_varCount, funcName, funcType, instance, isStatic);
++_callCount;
#if PEBBLE_TRACESTACK
TraceScope("PushCall");
#endif
return(true);
}
public PebbleEnum(ExecContext context, string _enumName, ITypeDef valueTypeIn)
{
enumName = _enumName;
valueType = valueTypeIn;
// Apparently need to register non-const first.
ITypeDef nonConstEnumType = TypeFactory.GetTypeDef_Enum(_enumName, false);
enumType = (TypeDef_Enum)TypeFactory.GetConstVersion(nonConstEnumType);
_classDef = new ClassDef_Enum(this, _enumName, enumType);
context.RegisterClass(_classDef);
_classDef.childAllocator = () => {
return(new ClassValue_Enum());
};
_classDef.Initialize();
//don't think this is needed _classDef.AddMemberLiteral("enumName", IntrinsicTypeDefs.CONST_STRING, _enumName, false);
_classDef.AddMember("name", IntrinsicTypeDefs.CONST_STRING);
_classDef.AddMember("value", valueType.Clone(true), null, false, true);
{
FunctionValue_Host.EvaluateDelegate eval = (_context, args, thisScope) => {
ClassValue cv = thisScope as ClassValue;
return(enumName + "::" + cv.Get(mrName).value);
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.STRING, new ArgList {
}, eval, false, _classDef.typeDef);
_classDef.AddMemberLiteral("ThisToString", newValue.valType, newValue, false);
}
_classDef.FinalizeClass(context);
if (mrName.isInvalid)
{
mrName = _classDef.GetMemberRef(null, "name", ClassDef.SEARCH.NORMAL);
mrValue = _classDef.GetMemberRef(null, "value", ClassDef.SEARCH.NORMAL);
}
}
public static void Register(Engine engine)
{
//@ class RegexGroup
// Stores information about a Regex group match. Basically a wrapper for System.Text.RegularExpressions.Group.
{
TypeDef_Class ourType = TypeFactory.GetTypeDef_Class("RegexGroup", null, false);
ClassDef classDef = engine.defaultContext.CreateClass("RegexGroup", ourType, null, null);
classDef.Initialize();
//@ const num index;
// The index of the character at the start of this match.
classDef.AddMember("index", IntrinsicTypeDefs.CONST_NUMBER);
//@ const num length;
// The length of the substring of this match.
classDef.AddMember("length", IntrinsicTypeDefs.CONST_NUMBER);
//@ const string value;
// The substring of this match.
classDef.AddMember("value", IntrinsicTypeDefs.CONST_STRING);
classDef.FinalizeClass(engine.defaultContext);
regexGroupClassDef = classDef;
}
// Make sure the List<RegexGroup> type is registered.
listRegexGroupClassDef = engine.defaultContext.RegisterIfUnregisteredList(regexGroupClassDef.typeDef);
//@ class RegexMatch
// Stores information about a single Regex substring match. Basically a wrapper for System.Text.RegularExpressions.Match.
{
TypeDef_Class ourType = TypeFactory.GetTypeDef_Class("RegexMatch", null, false);
ClassDef classDef = engine.defaultContext.CreateClass("RegexMatch", ourType, null, null);
classDef.Initialize();
//@ const num index;
// The index of the character at the start of this match.
classDef.AddMember("index", IntrinsicTypeDefs.CONST_NUMBER);
//@ const num length;
// The length of the substring of this match.
classDef.AddMember("length", IntrinsicTypeDefs.CONST_NUMBER);
//@ const string value;
// The substring of this match.
classDef.AddMember("value", IntrinsicTypeDefs.CONST_STRING);
//@ List<RegexGroup> groups;
// The regex groups of this match. If there are no groups this will be null.
classDef.AddMember("groups", listRegexGroupClassDef.typeDef);
classDef.FinalizeClass(engine.defaultContext);
regexMatchClassDef = classDef;
}
// ****************************************************************
// Make sure the List<string> type is registered.
ClassDef listStringClassDef = engine.defaultContext.RegisterIfUnregisteredList(IntrinsicTypeDefs.STRING);
// Make sure List<RegexMatch> is registered.
listMatchClassDef = engine.defaultContext.RegisterIfUnregisteredList(regexMatchClassDef.typeDef);
// ****************************************************************
//@ class Regex
// Provides static functions that implement regular expression matching for strings. Basically a wrapper for System.Text.RegularExpressions.Regex.
{
TypeDef_Class ourType = TypeFactory.GetTypeDef_Class("Regex", null, false);
ClassDef classDef = engine.defaultContext.CreateClass("Regex", ourType, null, null, true, true);
classDef.Initialize();
// ***
//@ static bool IsMatch(string input, string expression)
// Returns true if input matches the given regular expression.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string a = (string)args[0];
string b = (string)args[1];
return(Regex.IsMatch(a, b));
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.BOOL, new ArgList {
IntrinsicTypeDefs.STRING, IntrinsicTypeDefs.STRING
}, eval, false);
classDef.AddMemberLiteral("IsMatch", newValue.valType, newValue, true);
}
//@ static RegexMatch Match(string input, string pattern);
// Returns the first match of the given pattern in the input string, or null if no match.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string input = (string)args[0];
string pattern = (string)args[1];
Match match = Regex.Match(input, pattern);
if (match.Success)
{
ClassValue matchInst = regexMatchClassDef.Allocate(context);
Variable index = matchInst.GetByName("index");
Variable length = matchInst.GetByName("length");
Variable value = matchInst.GetByName("value");
index.value = Convert.ToDouble(match.Index);
length.value = Convert.ToDouble(match.Length);
value.value = match.Value;
return(matchInst);
}
return(null);
};
FunctionValue newValue = new FunctionValue_Host(regexMatchClassDef.typeDef, new ArgList {
IntrinsicTypeDefs.STRING, IntrinsicTypeDefs.STRING
}, eval, false);
classDef.AddMemberLiteral("Match", newValue.valType, newValue, true);
}
//@ static List<RegexMatch> Matches(string input, string pattern);
// Returns a list of all the matches of the given regular expression in the input string, or null if no matches found.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string input = (string)args[0];
string pattern = (string)args[1];
MatchCollection matchCol = Regex.Matches(input, pattern);
if (0 == matchCol.Count)
{
return(null);
}
ClassValue matchListInst = listMatchClassDef.Allocate(context);
PebbleList pebbleList = matchListInst as PebbleList;
foreach (Match match in matchCol)
{
ClassValue matchInst = regexMatchClassDef.Allocate(context);
Variable index = matchInst.GetByName("index");
Variable length = matchInst.GetByName("length");
Variable value = matchInst.GetByName("value");
index.value = Convert.ToDouble(match.Index);
length.value = Convert.ToDouble(match.Length);
value.value = match.Value;
// Note: In this C# regex library, 0 is always the default group (it is the whole match).
// That doesn't seem to be a regex standard, and it's entirely rendundant, so I'm only
// taking the non-default groups. match.groups is 0 when there are no non-default groups.
if (match.Groups.Count > 1)
{
ClassValue groupListInst = listRegexGroupClassDef.Allocate(context);
PebbleList groupList = groupListInst as PebbleList;
matchInst.GetByName("groups").value = groupListInst;
for (int ii = 1; ii < match.Groups.Count; ++ii)
{
Group group = match.Groups[ii];
ClassValue groupInst = regexGroupClassDef.Allocate(context);
groupInst.GetByName("index").value = Convert.ToDouble(group.Index);
groupInst.GetByName("length").value = Convert.ToDouble(group.Length);
groupInst.GetByName("value").value = group.Value;
groupList.list.Add(new Variable("(made my Regex::Matches)", groupInst.classDef.typeDef, groupInst));
}
}
pebbleList.list.Add(new Variable("(Regex::Matches)", regexMatchClassDef.typeDef, matchInst));
}
return(matchListInst);
};
FunctionValue newValue = new FunctionValue_Host(listMatchClassDef.typeDef, new ArgList {
IntrinsicTypeDefs.STRING, IntrinsicTypeDefs.STRING
}, eval, false);
classDef.AddMemberLiteral("Matches", newValue.valType, newValue, true);
}
//@ static string Replace(string input, string pattern, string replacement);
// Replace any matches of the given pattern in the input string with the replacement string.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string input = (string)args[0];
string pattern = (string)args[1];
string replacement = (string)args[2];
return(Regex.Replace(input, pattern, replacement));
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.STRING, new ArgList {
IntrinsicTypeDefs.STRING, IntrinsicTypeDefs.STRING, IntrinsicTypeDefs.STRING
}, eval, false);
classDef.AddMemberLiteral("Replace", newValue.valType, newValue, true);
}
//@ static List<string> Split(string input, string pattern);
// Splits an input string into an array of substrings at the positions defined by a regular expression match.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string input = (string)args[0];
string pattern = (string)args[1];
string[] splitArray = Regex.Split(input, pattern);
ClassValue inst = listStringClassDef.Allocate(context);
inst.debugName = "(Regex::Split result)";
PebbleList list = (PebbleList)inst;
foreach (string str in splitArray)
{
list.list.Add(new Variable(null, IntrinsicTypeDefs.STRING, str));
}
return(inst);
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.LIST_STRING, new ArgList {
IntrinsicTypeDefs.STRING, IntrinsicTypeDefs.STRING
}, eval, false);
classDef.AddMemberLiteral("Split", newValue.valType, newValue, true);
}
// ***
classDef.FinalizeClass(engine.defaultContext);
}
UnitTests.testFuncDelegates.Add("RegexLib", RunTests);
}
public bool Write(ExecContext context, PebbleStreamHelper stream, object value)
{
Pb.Assert(!(value is Variable));
if (null != textWriter)
{
string s = CoreLib.ValueToString(context, value, false);
textWriter.Write(s);
return(true);
}
if (null == value)
{
writer.Write("null");
}
else if (value is FunctionValue)
{
context.SetRuntimeError(RuntimeErrorType.SerializeUnknownType, "Cannot serialize functions.");
return(false);
}
else if (value is bool)
{
writer.Write((bool)value);
}
else if (value is double)
{
writer.Write((double)value);
}
else if (value is string)
{
writer.Write((string)value);
}
else if (value is PebbleList)
{
PebbleList plist = value as PebbleList;
// - Serialize full type, ie "List<string>".
writer.Write(plist.classDef.name);
// - Serialize count.
writer.Write(plist.list.Count);
// - Finally, serialize each object.
foreach (Variable listvar in plist.list)
{
if (!Write(context, stream, listvar.value))
{
return(false);
}
}
}
else if (value is PebbleDictionary)
{
PebbleDictionary dic = value as PebbleDictionary;
// - class name
writer.Write(dic.classDef.name);
// - count
writer.Write((Int32)dic.dictionary.Count);
// - each key, value
foreach (var kvp in dic.dictionary)
{
if (!Write(context, stream, kvp.Key))
{
return(false);
}
if (!Write(context, stream, kvp.Value.value))
{
return(false);
}
}
}
else if (value is ClassValue_Enum)
{
ClassValue_Enum enumVal = value as ClassValue_Enum;
writer.Write(enumVal.classDef.name);
writer.Write(enumVal.GetName());
}
else if (value is ClassValue)
{
ClassValue classVal = value as ClassValue;
MemberRef serMemRef = classVal.classDef.GetMemberRef(null, "Serialize", ClassDef.SEARCH.NORMAL);
if (serMemRef.isInvalid)
{
context.SetRuntimeError(RuntimeErrorType.SerializeInvalidClass, "Class '" + classVal.classDef.name + "' cannot be serialized because it doesn't implement a serialization function.");
return(false);
}
writer.Write(classVal.classDef.name);
Variable serVar = classVal.Get(serMemRef);
FunctionValue serFunc = serVar.value as FunctionValue;
object result = serFunc.Evaluate(context, new List <object> {
stream
}, classVal);
if (context.IsRuntimeErrorSet())
{
return(false);
}
if (result is bool && false == (bool)result)
{
context.SetRuntimeError(RuntimeErrorType.SerializeFailed, "Serialize function of class '" + classVal.classDef.name + "' returned false.");
return(false);
}
}
else
{
throw new Exception("Internal error: Unexpected type of value in stream Write.");
}
return(true);
}
public static void Register(Engine engine)
{
// *** Register required types.
List <ITypeDef> genericTypes = new ArgList();
genericTypes.Add(IntrinsicTypeDefs.STRING);
// This code makes sure that Result<string> is a registered class and type.
TypeDef_Class resultTypeDef = TypeFactory.GetTypeDef_Class("Result", genericTypes, false);
ClassDef resultClassDef = engine.defaultContext.RegisterIfUnregisteredTemplate(resultTypeDef);
// This does List<string>.
ClassDef listStringClassDef = engine.defaultContext.RegisterIfUnregisteredList(IntrinsicTypeDefs.STRING);
// ***
//@ class File
TypeDef_Class ourType = TypeFactory.GetTypeDef_Class("File", null, false);
ClassDef classDef = engine.defaultContext.CreateClass("File", ourType, null, null, true);
classDef.Initialize();
//@ const string lastError;
// Stores the message of the last error generated by this library.
classDef.AddMemberLiteral("lastError", IntrinsicTypeDefs.CONST_STRING, "", true);
Variable lastErrorVar = null;
//@ static string ClearLastError()
// Clears File::lastError, returning its previous value.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string lastError = (string)lastErrorVar.value;
lastErrorVar.value = "";
return(lastError);
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.STRING, new ArgList {
}, eval, false);
classDef.AddMemberLiteral("ClearLastError", newValue.valType, newValue, true);
}
//@ static bool Copy(string source, string dest)
// Copies a file from source to dest.
// Returns false and sets lastError on error.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string source = (string)args[0];
string dest = (string)args[1];
lastErrorVar.value = "";
try {
File.Copy(source, dest);
} catch (Exception e) {
lastErrorVar.value = "Copy: " + e.ToString();
return(false);
}
return(true);
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.BOOL, new ArgList {
IntrinsicTypeDefs.STRING, IntrinsicTypeDefs.STRING
}, eval, false);
classDef.AddMemberLiteral("Copy", newValue.valType, newValue, true);
}
//@ static bool CreateDir(string path)
// Creates directory.
// Returns false and sets lastError on error.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string path = (string)args[0];
lastErrorVar.value = "";
// Doesn't throw exceptions.
if (Directory.Exists(path))
{
lastErrorVar.value = "CreateDir: Directory already exists.";
return(false);
}
try {
Directory.CreateDirectory(path);
} catch (Exception e) {
lastErrorVar.value = "CreateDir: " + e.ToString();
return(false);
}
return(true);
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.BOOL, new ArgList {
IntrinsicTypeDefs.STRING
}, eval, false);
classDef.AddMemberLiteral("CreateDir", newValue.valType, newValue, true);
}
//@ static bool Delete(string path)
// Returns true if file deleted.
// Returns false and sets lastError on error.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string path = (string)args[0];
// Doesn't throw exceptions.
if (!File.Exists(path))
{
lastErrorVar.value = "Delete: File not found.";
return(false);
}
try {
File.Delete(path);
} catch (Exception e) {
lastErrorVar.value = "Delete: " + e.ToString();
return(false);
}
lastErrorVar.value = "";
return(true);
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.BOOL, new ArgList {
IntrinsicTypeDefs.STRING
}, eval, false);
classDef.AddMemberLiteral("Delete", newValue.valType, newValue, true);
}
//@ static bool DeleteDir(string path)
// Returns true if file deleted.
// Returns false and sets lastError on error.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string path = (string)args[0];
// Doesn't throw exceptions.
if (!Directory.Exists(path))
{
lastErrorVar.value = "DeleteDir: Directory not found.";
return(false);
}
try {
Directory.Delete(path);
} catch (Exception e) {
lastErrorVar.value = "DeleteDir: " + e.ToString();
return(false);
}
lastErrorVar.value = "";
return(true);
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.BOOL, new ArgList {
IntrinsicTypeDefs.STRING
}, eval, false);
classDef.AddMemberLiteral("DeleteDir", newValue.valType, newValue, true);
}
//@ static string GetCurrentDirectory()
// Returns the full path of the current directory.
// Returns "" and sets lastError on error.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string result;
try {
result = Directory.GetCurrentDirectory();
} catch (Exception e) {
lastErrorVar.value = "GetCurrentDirectory: " + e.ToString();
return("");
}
lastErrorVar.value = "";
return(result);
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.STRING, new ArgList {
}, eval, false);
classDef.AddMemberLiteral("GetCurrentDirectory", newValue.valType, newValue, true);
}
//@ static List<string> GetDirs(string path)
// Returns list of subdirectories of path.
// Returns null and sets lastError on error.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string path = (string)args[0];
// Doesn't throw exceptions.
if (!Directory.Exists(path))
{
lastErrorVar.value = "GetDirs: Directory not found.";
return(null);
}
string[] files;
try {
files = Directory.GetDirectories(path);
} catch (Exception e) {
lastErrorVar.value = "GetDirs: " + e.ToString();
return(null);
}
ClassValue inst = listStringClassDef.Allocate(context);
inst.debugName = "(GetDirs result)";
PebbleList list = (PebbleList)inst;
foreach (string file in files)
{
list.list.Add(new Variable(null, IntrinsicTypeDefs.STRING, file));
}
lastErrorVar.value = "";
return(inst);
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.LIST_STRING, new List <ITypeDef> {
IntrinsicTypeDefs.STRING
}, eval, false);
classDef.AddMemberLiteral("GetDirs", newValue.valType, newValue, true);
}
//@ static List<string> GetFiles(string path)
// Returns list of all files in the given directory path.
// Filenames are NOT prefaced by path.
// Returns null and sets lastError on error.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string path = (string)args[0];
if (!Directory.Exists(path))
{
lastErrorVar.value = "GetFiles: Directory not found.";
return(null);
}
string[] files;
try {
files = Directory.GetFiles(path);
} catch (Exception e) {
lastErrorVar.value = "GetFiles: " + e.ToString();
return(null);
}
ClassValue inst = listStringClassDef.Allocate(context);
inst.debugName = "(GetFiles result)";
PebbleList list = (PebbleList)inst;
int pathLen = path.Length + 1;
foreach (string file in files)
{
string justFile = file.Substring(pathLen);
list.list.Add(new Variable(null, IntrinsicTypeDefs.STRING, justFile));
}
lastErrorVar.value = "";
return(inst);
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.LIST_STRING, new List <ITypeDef> {
IntrinsicTypeDefs.STRING
}, eval, false);
classDef.AddMemberLiteral("GetFiles", newValue.valType, newValue, true);
}
//@ static bool Exists(string path)
// Returns true if file exists, false if it doesn't.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string path = (string)args[0];
// Doesn't throw exceptions.
return(File.Exists(path));
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.BOOL, new ArgList {
IntrinsicTypeDefs.STRING
}, eval, false);
classDef.AddMemberLiteral("Exists", newValue.valType, newValue, true);
}
//@ static bool Move(string source, string dest)
// Move a file from source to dest.
// Returns false and sets lastError on error.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string source = (string)args[0];
string dest = (string)args[1];
lastErrorVar.value = "";
try {
File.Move(source, dest);
} catch (Exception e) {
lastErrorVar.value = "Move: " + e.ToString();
return(false);
}
return(true);
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.BOOL, new ArgList {
IntrinsicTypeDefs.STRING, IntrinsicTypeDefs.STRING
}, eval, false);
classDef.AddMemberLiteral("Move", newValue.valType, newValue, true);
}
//@ static Result<string> Read(string path)
// Reads content of file as text. Returns an instance of Result<string>.
// If succeeded, status = 0, value = file contents.
// On error, status != 0, message = an error message.
{
// Note that this function cannot use lastError because strings cannot be null.
// This is why ReadLines can just return a List<string>: the list can indicate error by being null.
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string path = (string)args[0];
//ClassValue inst = resultClassDef.childAllocator();
ClassValue inst = resultClassDef.Allocate(context);
Variable status = inst.GetByName("status");
Variable value = inst.GetByName("value");
Variable message = inst.GetByName("message");
string result;
try {
result = File.ReadAllText(path);
} catch (Exception e) {
status.value = -1.0;
message.value = "Read: " + e.ToString();
return(inst);
}
// The docs don't say this ever returns null, but just in case.
if (null == result)
{
status.value = -1.0;
message.value = "Read: File.ReadAllText returned null.";
}
value.value = result;
return(inst);
};
FunctionValue newValue = new FunctionValue_Host(resultClassDef.typeDef, new ArgList {
IntrinsicTypeDefs.STRING
}, eval, false);
classDef.AddMemberLiteral("Read", newValue.valType, newValue, true);
}
//@ static List<string> ReadLines(string path)
// Returns a list containing the lines of the given file.
// On error, returns null and sets last error.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string path = (string)args[0];
IEnumerable <string> result;
try {
// Note: ReadLines is a little more efficient on memory than ReadAllLines, but the .NET used by Unity 2017 doesn't support it.
// Shouldn't really matter. If you're processing huge files, probably Pebble isn't the way to go.
//result = File.ReadLines(path);
result = File.ReadAllLines(path);
} catch (Exception e) {
lastErrorVar.value = "ReadLines: " + e.ToString();
return(null);
}
// The docs don't say this ever returns null, but just in case.
if (null == result)
{
lastErrorVar.value = "ReadLines: File.ReadLines returned null.";
return(null);
}
ClassDef listClassDef = context.GetClass("List<string>");
ClassValue listinst = listClassDef.childAllocator();
listinst.classDef = listClassDef;
listinst.debugName = "(ReadLines result)";
PebbleList list = (PebbleList)listinst;
foreach (string line in result)
{
list.list.Add(new Variable(null, IntrinsicTypeDefs.STRING, line));
}
lastErrorVar.value = "";
return(listinst);
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.LIST_STRING, new ArgList {
IntrinsicTypeDefs.STRING
}, eval, false);
classDef.AddMemberLiteral("ReadLines", newValue.valType, newValue, true);
}
//@ static bool SetCurrentDirectory(string newDir)
// Changes the current directory. Returns true on success.
// Returns false and sets lastError on error.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string path = (string)args[0];
try {
Directory.SetCurrentDirectory(path);
} catch (Exception e) {
lastErrorVar.value = "SetCurrentDirectory: " + e.ToString();
return(false);
}
lastErrorVar.value = "";
return(true);
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.BOOL, new ArgList {
IntrinsicTypeDefs.STRING
}, eval, false);
classDef.AddMemberLiteral("SetCurrentDirectory", newValue.valType, newValue, true);
}
//@ static bool Write(string path, string contents)
// Writes contents to file. If file exists it is overwritten.
// Returns true on success.
// On error returns false and sets lastError.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string path = (string)args[0];
string contents = (string)args[1];
try {
File.WriteAllText(path, contents);
} catch (Exception e) {
lastErrorVar.value = "Write: " + e.ToString();
return(false);
}
lastErrorVar.value = "";
return(true);
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.BOOL, new ArgList {
IntrinsicTypeDefs.STRING, IntrinsicTypeDefs.STRING
}, eval, false);
classDef.AddMemberLiteral("Write", newValue.valType, newValue, true);
}
classDef.FinalizeClass(engine.defaultContext);
lastErrorVar = classDef.staticVars[0];
UnitTests.testFuncDelegates.Add("FileLib", RunTests);
}
// Create a new instance of the class.
public ClassValue Allocate(ExecContext context)
{
ClassValue result = childAllocator();
result.classDef = this;
result.debugName = name + " Inst";
bool scopePushed = false;
for (int ii = 0; ii < _fields.Count; ++ii)
{
ClassMember member = _fields.Get(ii);
object value = null;
if (null != member.initializer)
{
if (!scopePushed)
{
scopePushed = true;
if (!context.stack.PushClassScope(result, context))
{
context.SetRuntimeError(RuntimeErrorType.StackOverflow, "ClassValue.Allocate - stack overflow.");
return(null);
}
}
value = member.initializer.Evaluate(context);
}
else if (!member.typeDef.IsReference()) // don't instantiate class refs automatically
{
value = member.typeDef.GetDefaultValue(context);
}
Variable newVar = new Variable(member.name, member.typeDef, value);
result.fieldVars.Add(newVar);
}
if (null != constructor)
{
if (context.IsRuntimeErrorSet())
{
return(null);
}
if (!scopePushed)
{
scopePushed = true;
if (!context.stack.PushClassScope(result, context))
{
context.SetRuntimeError(RuntimeErrorType.StackOverflow, "ClassValue.Allocate - stack overflow.");
return(null);
}
}
constructor.Evaluate(context);
if (context.IsRuntimeErrorSet())
{
return(null);
}
}
if (scopePushed)
{
context.stack.PopScope();
}
return(result);
}
public bool Read(ExecContext context, PebbleStreamHelper stream, Variable variable)
{
if (variable.type.IsConst())
{
context.SetRuntimeError(RuntimeErrorType.SerializeIntoConst, "Cannot serialize into const variables.");
return(false);
}
if (variable.type.CanStoreValue(context, IntrinsicTypeDefs.BOOL))
{
variable.value = reader.ReadBoolean();
}
else if (variable.type == IntrinsicTypeDefs.NUMBER)
{
variable.value = reader.ReadDouble();
}
else if (variable.type == IntrinsicTypeDefs.STRING)
{
variable.value = reader.ReadString();
}
else if (variable.type.GetName().StartsWith("List<"))
{
string listTypeName = reader.ReadString();
if ("null" == listTypeName)
{
variable.value = null;
return(true);
}
// Is it possible that the specific generic class isn't registered yet.
if (!EnsureGenericIsRegistered(context, listTypeName))
{
return(false);
}
ClassDef listDef = context.GetClass(listTypeName);
if (null == listDef)
{
context.SetRuntimeError(RuntimeErrorType.SerializeUnknownType, "Cannot deserialize list type '" + listTypeName + "' because it is unknown.");
return(false);
}
ClassValue listValue = listDef.Allocate(context);
PebbleList newlist = listValue as PebbleList;
variable.value = listValue;
ITypeDef elementType = listDef.typeDef.genericTypes[0];
int count = reader.ReadInt32();
for (int ii = 0; ii < count; ++ii)
{
Variable newelem = new Variable(null, elementType);
if (!Read(context, stream, newelem))
{
return(false);
}
newlist.list.Add(newelem);
}
}
else if (variable.type.GetName().StartsWith("Dictionary<"))
{
string listTypeName = reader.ReadString();
if ("null" == listTypeName)
{
variable.value = null;
return(true);
}
// Is it possible that the specific generic class isn't registered yet.
if (!EnsureGenericIsRegistered(context, listTypeName))
{
return(false);
}
ClassDef listDef = context.GetClass(listTypeName);
if (null == listDef)
{
context.SetRuntimeError(RuntimeErrorType.SerializeUnknownType, "Cannot deserialize list type '" + listTypeName + "' because it is unknown.");
return(false);
}
ClassValue listValue = listDef.Allocate(context);
PebbleDictionary newlist = listValue as PebbleDictionary;
variable.value = listValue;
ITypeDef keyType = listDef.typeDef.genericTypes[0];
ITypeDef valueType = listDef.typeDef.genericTypes[1];
int count = reader.ReadInt32();
Variable tempKeyVar = new Variable("tempKeyVar", keyType);
for (int ii = 0; ii < count; ++ii)
{
if (!Read(context, stream, tempKeyVar))
{
return(false);
}
Variable newelem = new Variable(null, valueType);
if (!Read(context, stream, newelem))
{
return(false);
}
newlist.dictionary.Add(tempKeyVar.value, newelem);
}
}
else if (variable.type is TypeDef_Enum)
{
string enumName = reader.ReadString();
string valueName = reader.ReadString();
// This happens.
ITypeDef streamedType = context.GetTypeByName(enumName);
if (null == streamedType)
{
context.SetRuntimeError(RuntimeErrorType.SerializeUnknownType, "Attempt to load saved enum of unknown type '" + enumName + "'.");
return(false);
}
// I can't get this to happen.
if (!(streamedType is TypeDef_Enum))
{
context.SetRuntimeError(RuntimeErrorType.SerializeUnknownType, "Type '" + enumName + "' saved as something other than an enum, but attempted to stream into an enum variable.");
return(false);
}
ClassDef enumClassDef = context.GetClass(enumName);
Pb.Assert(null != enumClassDef, "Somehow we got a type for an enum but not the def.");
ClassDef_Enum enumDef = enumClassDef as ClassDef_Enum;
Pb.Assert(null != enumClassDef, "Registered type is enum but def is classdef.");
// This happens.
ClassValue_Enum cve = enumDef.enumDef.GetValue(valueName);
if (null == cve)
{
context.SetRuntimeError(RuntimeErrorType.EnumValueNotFound, "Enum '" + enumName + "' does not have saved value '" + valueName + "'.");
return(false);
}
variable.value = cve;
}
else if (variable.type is TypeDef_Class)
{
TypeDef_Class varType = variable.type as TypeDef_Class;
// Get class name.
string streamClassName = reader.ReadString();
if ("null" == streamClassName)
{
variable.value = null;
return(true);
}
ITypeDef streamedType = context.GetTypeByName(streamClassName);
if (null == streamedType)
{
context.SetRuntimeError(RuntimeErrorType.SerializeUnknownType, "Serialized type '" + streamClassName + "' not found.");
return(false);
}
if (!varType.CanStoreValue(context, streamedType))
{
context.SetRuntimeError(RuntimeErrorType.SerializeTypeMismatch, "Cannot deserialize a '" + streamClassName + "' into a variable of type '" + varType.GetName() + "'.");
return(false);
}
TypeDef_Class streamedClassType = streamedType as TypeDef_Class;
Pb.Assert(null != streamedClassType, "Somehow a streamed type is not a class but *can* be stored in a class type?!");
ClassDef streamedClassDef = context.GetClass(streamClassName);
Pb.Assert(null != streamedClassDef, "Somehow we got a type for a class but not the def.");
MemberRef serMemRef = streamedClassDef.GetMemberRef(null, "Serialize", ClassDef.SEARCH.NORMAL);
if (serMemRef.isInvalid)
{
context.SetRuntimeError(RuntimeErrorType.SerializeInvalidClass, "Serialize function of class '" + streamClassName + "' not found.");
return(false);
}
ClassValue streamedClassValue = streamedClassDef.Allocate(context);
Variable serFuncVar = streamedClassValue.Get(serMemRef);
FunctionValue serFuncVal = serFuncVar.value as FunctionValue;
serFuncVal.Evaluate(context, new List <object>()
{
stream
}, streamedClassValue);
if (context.IsRuntimeErrorSet())
{
return(false);
}
variable.value = streamedClassValue;
}
else
{
throw new Exception("Internal error: Unexpected type of value in stream Read.");
}
return(true);
}
public static string ValueToScript(ExecContext context, object value, string prefix = "", bool topLevel = true)
{
string result = "";
string postfix = topLevel ? ";" : "";
if (value is double)
{
return(Convert.ToString((double)value) + postfix);
}
else if (value is bool)
{
return(((bool)value ? "true" : "false") + postfix);
}
else if (value is string)
{
return("\"" + (string)value + "\"" + postfix);
}
else if (value is ClassValue_Enum) // is enum
{
return(((ClassValue_Enum)value).ToString() + postfix);
}
else if (value is ClassValue)
{
ClassValue table = value as ClassValue;
result = "new " + table.classDef.typeDef.ToString() + " {\n";
// ThisToScript must not be static. It's going to be printing info about a class instance, right?
MemberRef toStrMem = table.classDef.GetMemberRef(null, "ThisToScript", ClassDef.SEARCH.NORMAL);
Variable funcVar = null;
if (!toStrMem.isInvalid)
{
funcVar = table.Get(toStrMem) as Variable;
}
if (null != funcVar)
{
FunctionValue funcVal = funcVar.value as FunctionValue;
result += funcVal.Evaluate(context, new List <object> {
prefix
}, table) as string;
}
else
{
foreach (Variable kvp in table.fieldVars)
{
if (!(kvp.type is TypeDef_Function) && !kvp.type.IsConst())
{
result += prefix + "\t" + kvp.name + " = " + ValueToScript(context, kvp.value, prefix + "\t", false);
if (!result.EndsWith(";"))
{
result += ";";
}
result += "\n";
}
}
}
result += prefix + "}" + postfix;
}
else if (null == value)
{
result = "null" + postfix;
}
return(result);
}
public static void Register(Engine engine)
{
//*****************************
// Create ScriptError enum.
scriptErrorEnum = new PebbleEnum(engine.defaultContext, "ScriptError", IntrinsicTypeDefs.CONST_STRING);
// Add a value for "no error" since enums can't be null.
scriptErrorEnum.AddValue_Literal(engine.defaultContext, "NoError", "NoError");
// Add both Parse and Runtime errors to the list.
foreach (string name in Enum.GetNames(typeof(ParseErrorType)))
{
scriptErrorEnum.AddValue_Literal(engine.defaultContext, name, name);
}
foreach (string name in Enum.GetNames(typeof(RuntimeErrorType)))
{
scriptErrorEnum.AddValue_Literal(engine.defaultContext, name, name);
}
// Finalize.
scriptErrorEnum.EvaluateValues(engine.defaultContext);
// Save the value for NoError for convenience.
scriptErrorEnum_noErrorValue = scriptErrorEnum.GetValue("NoError");
//*******************************
//@ class Result<T>
// This was added just in case users might have a need for a templated class that encapsulates a value and a status code.
{
TypeDef_Class ourType = TypeFactory.GetTypeDef_Class("Result", new ArgList {
IntrinsicTypeDefs.TEMPLATE_0
}, false);
ClassDef classDef = engine.defaultContext.CreateClass("Result", ourType, null, new List <string> {
"T"
});
classDef.Initialize();
//@ T value;
// The resultant value IF there was no error.
classDef.AddMember("value", IntrinsicTypeDefs.TEMPLATE_0);
//@ num status;
// A numeric status code. By convention, 0 means no error and anything else means error.
classDef.AddMemberLiteral("status", IntrinsicTypeDefs.NUMBER, 0.0);
//@ string message;
// A place to store error messages if desired.
classDef.AddMember("message", IntrinsicTypeDefs.STRING);
//@ bool IsSuccess()
// Returns true iff status == 0.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
ClassValue scope = thisScope as ClassValue;
return((double)scope.GetByName("status").value == 0.0);
};
FunctionValue_Host newValue = new FunctionValue_Host(IntrinsicTypeDefs.BOOL, new ArgList {
}, eval, false, ourType);
classDef.AddMemberLiteral("IsSuccess", newValue.valType, newValue);
}
//@ string ToString()
// Returns a string representation of the Result.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
ClassValue scope = thisScope as ClassValue;
double status = (double)scope.GetByName("status").value;
string result = scope.classDef.typeDef.ToString() + "[";
if (0.0 == status)
{
result += CoreLib.ValueToString(context, scope.GetByName("value").value, true);
}
else
{
result += status + ": \"" + (string)scope.GetByName("message").value + "\"";
}
return(result + "]");
};
FunctionValue_Host newValue = new FunctionValue_Host(IntrinsicTypeDefs.STRING, new ArgList {
}, eval, false, ourType);
classDef.AddMemberLiteral("ThisToString", newValue.valType, newValue);
}
classDef.FinalizeClass(engine.defaultContext);
resultClassDef = classDef;
}
//*******************************
//@ class ScriptResult<T>
// For returning the result of something that can error, like an Exec call.
{
TypeDef_Class ourType = TypeFactory.GetTypeDef_Class("ScriptResult", new ArgList {
IntrinsicTypeDefs.TEMPLATE_0
}, false);
ClassDef classDef = engine.defaultContext.CreateClass("ScriptResult", ourType, null, new List <string> {
"T"
});
classDef.Initialize();
//@ T value;
// The return value if there was no error.
classDef.AddMember("value", IntrinsicTypeDefs.TEMPLATE_0);
//@ ScriptError error;
// ScriptError.NoError if no error.
classDef.AddMemberLiteral("error", CoreLib.scriptErrorEnum._classDef.typeDef, CoreLib.scriptErrorEnum_noErrorValue);
//@ string message;
// Optional error message.
classDef.AddMember("message", IntrinsicTypeDefs.STRING);
//@ bool IsSuccess()
// Returns true iff error == ScriptError.NoError.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
ClassValue scope = thisScope as ClassValue;
return(scope.GetByName("error").value == CoreLib.scriptErrorEnum_noErrorValue);
};
FunctionValue_Host newValue = new FunctionValue_Host(IntrinsicTypeDefs.BOOL, new ArgList {
}, eval, false, ourType);
classDef.AddMemberLiteral("IsSuccess", newValue.valType, newValue);
}
//@ string ToString()
// Returns a string representation of the ScriptError.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
ClassValue scope = thisScope as ClassValue;
var error = (ClassValue_Enum)scope.GetByName("error").value;
string result = scope.classDef.typeDef.ToString() + "[";
if (CoreLib.scriptErrorEnum_noErrorValue == error)
{
result += CoreLib.ValueToString(context, scope.GetByName("value").value, true);
}
else
{
result += error.GetName() + ": \"" + (string)scope.GetByName("message").value + "\"";
}
return(result + "]");
};
FunctionValue_Host newValue = new FunctionValue_Host(IntrinsicTypeDefs.STRING, new ArgList {
}, eval, false, ourType);
classDef.AddMemberLiteral("ThisToString", newValue.valType, newValue);
}
classDef.FinalizeClass(engine.defaultContext);
resultClassDef = classDef;
}
// This code makes sure that Result<bool> is a registered class and type.
List <ITypeDef> genericTypes = new ArgList();
genericTypes.Add(IntrinsicTypeDefs.BOOL);
scriptResultBoolTypeDef = TypeFactory.GetTypeDef_Class("ScriptResult", genericTypes, false);
scriptResultBoolClassDef = engine.defaultContext.RegisterIfUnregisteredTemplate(scriptResultBoolTypeDef);
Pb.Assert(null != scriptResultBoolTypeDef && null != scriptResultBoolClassDef, "Error initializing ScriptResult<bool>.");
////////////////////////////////////////////////////////////////////////////
// Register non-optional libraries.
//CoreResult.Register(engine);
// List and Dictionary probably need to be first because other libraries sometimes use them.
CoreList.Register(engine);
CoreDictionary.Register(engine);
MathLib.Register(engine);
RegexLib.Register(engine);
StringLib.Register(engine);
StreamLib.Register(engine);
//@ global const num FORMAX;
// The highest value a for iterator can be. Attempting to exceed it generates an error.
engine.defaultContext.CreateGlobal("FORMAX", IntrinsicTypeDefs.CONST_NUMBER, Expr_For.MAX);
////////////////////////////////////////////////////////////////////////////
// Library functions
//@ global ScriptResult<bool> Exec(string script)
// Executes the supplied script.
// Since this is not running "interactive" (or inline), the only way the script can
// have an external effect is if it affects global things (variables, class definitions).
// The returned ScriptResult's value is only true(success) or false (error).
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string script = (string)args[0];
ClassValue scriptResultInst = scriptResultBoolClassDef.Allocate(context);
Variable value = scriptResultInst.GetByName("value");
Variable error = scriptResultInst.GetByName("error");
Variable message = scriptResultInst.GetByName("message");
ScriptResult result = context.engine.RunScript(script, false, null, true);
if (null != result.parseErrors)
{
value.value = false;
error.value = scriptErrorEnum.GetValue(result.parseErrors[0].type.ToString());;
message.value = result.parseErrors[0].ToString();
}
else if (null != result.runtimeError)
{
value.value = false;
error.value = result.value;
message.value = result.runtimeError.ToString();
}
else
{
value.value = true;
error.value = scriptErrorEnum_noErrorValue;
message.value = "";
}
return(scriptResultInst);
};
FunctionValue newValue = new FunctionValue_Host(scriptResultBoolTypeDef, new ArgList {
IntrinsicTypeDefs.STRING
}, eval, false);
engine.AddBuiltInFunction(newValue, "Exec");
}
//@ global ScriptResult<bool> ExecInline(string)
// This executes the given script in the current scope. This is different from Exec, because Exec exists in its own scope.
// The returned ScriptResult's value is only true(success) or false (error).
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string script = (string)args[0];
ClassValue scriptResultInst = scriptResultBoolClassDef.Allocate(context);
Variable value = scriptResultInst.GetByName("value");
Variable error = scriptResultInst.GetByName("error");
Variable message = scriptResultInst.GetByName("message");
ScriptResult result = context.engine.RunInteractiveScript(script, false);
if (null != result.parseErrors)
{
value.value = false;
error.value = scriptErrorEnum.GetValue(result.parseErrors[0].type.ToString());;
message.value = result.parseErrors[0].ToString();
}
else if (null != result.runtimeError)
{
value.value = false;
error.value = result.value;
message.value = result.runtimeError.ToString();
}
else
{
value.value = true;
error.value = scriptErrorEnum_noErrorValue;
message.value = "";
}
return(scriptResultInst);
};
FunctionValue newValue = new FunctionValue_Host(scriptResultBoolTypeDef, new ArgList {
IntrinsicTypeDefs.STRING
}, eval, false);
engine.AddBuiltInFunction(newValue, "ExecInline");
}
//@ global string Print(...)
// Converts all arguments to strings, concatenates them, then outputs the result using the Engine' Log function.
// This function can be set to whatever the host program likes: see Engine.Log
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string result = StandardPrintFunction(context, args);
context.engine.Log(result);
return(result);
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.STRING, new List <ITypeDef> {
IntrinsicTypeDefs.ANY
}, eval, true);
engine.AddBuiltInFunction(newValue, "Print");
}
//@ global string ToScript(any)
// Returns a script which, when run, returns a value equal to the value passed into ToScript.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
object val0 = args[0];
return(ValueToScript(context, val0));
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.STRING, new ArgList {
IntrinsicTypeDefs.ANY
}, eval, false);
engine.AddBuiltInFunction(newValue, "ToScript");
}
/////////////////////////////////////////////////////////////////
// Type Conversion
//@ global bool ToBool(any)
// Attempts to convert input into a boolean value.
// 0 and null are false. != 0 and non-null references are true. Strings are handled by Convert.ToBoolean,
// which can throw an exception if it doesn't know how to convert the string.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
object val = args[0];
if (null == val)
{
return(false);
}
else if (val is bool)
{
return((bool)val);
}
else if (val is double)
{
return(Convert.ToBoolean((double)val));
}
else if (val is string)
{
try {
return(Convert.ToBoolean((string)val)); // this loves to throw errors
} catch (Exception e) {
context.SetRuntimeError(RuntimeErrorType.ConversionInvalid, "ToBool - C# error: " + e.ToString());
return(null);
}
}
else
{
return(true);
}
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.BOOL, new ArgList {
IntrinsicTypeDefs.ANY
}, eval, false);
engine.AddBuiltInFunction(newValue, "ToBool");
}
//@ global num ToNum(any)
// Attempts to convert input to a num.
// true -> 1, false -> 0, null -> 0, non-null object reference -> 1. Strings are handled by Convert.ToDouble,
// which can throw an error if it doesn't know how to convert the string.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
object val = args[0];
if (null == val)
{
return(0.0);
}
else if (val is double)
{
return((double)val);
}
else if (val is bool)
{
return((bool)val ? 1.0 : 0.0);
}
else if (val is string)
{
try {
return(Convert.ToDouble((string)val)); // this loves to throw errors
} catch {
context.SetRuntimeError(RuntimeErrorType.ConversionInvalid, "ToNum - Cannot convert string \"" + ((string)val) + "\" to number.");
return(null);
}
}
else
{
return(1.0);
}
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.NUMBER, new ArgList {
IntrinsicTypeDefs.ANY
}, eval, false);
engine.AddBuiltInFunction(newValue, "ToNum");
}
//@ global string ToString(...)
// Converts all arguments to strings, concatenates them, and returns the result.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
return(StandardPrintFunction(context, args));
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.STRING, new ArgList {
IntrinsicTypeDefs.ANY
}, eval, true);
engine.AddBuiltInFunction(newValue, "ToString");
}
UnitTests.testFuncDelegates.Add("CoreLib", RunTests);
}
