/// <summary>
/// return value;
/// </summary>
/// <returns></returns>
public override Expr Parse()
{
var token = _tokenIt.NextToken;
var exp = new FunctionExpr();
_parser.SetupContext(exp, token);
var name = "anon_" + token.Line + "_" + token.LineCharPos;
_tokenIt.Advance();
_tokenIt.Expect(Tokens.LeftParenthesis);
var argnames = _parser.ParseNames();
exp.Meta.Init(name, argnames);
_tokenIt.Expect(Tokens.RightParenthesis);
ParseBlock(exp);
var lambdaExp = new LambdaExpr();
lambdaExp.Expr = exp;
return lambdaExp;
}
/// <summary>
/// Call a function by passing in all the values.
/// </summary>
/// <param name="ctx">The context of the runtime</param>
/// <param name="functionName">The name of the function to call.</param>
/// <param name="paramListExpressions">List of parameters as expressions to evaluate first to actual values</param>
/// <param name="paramVals">List to store the resolved paramter expressions. ( these will be resolved if paramListExpressions is supplied and resolveParams is true. If
/// resolveParams is false, the list is assumed to have the values for the paramters to the function.</param>
/// <param name="resolveParams">Whether or not to resolve the list of parameter expression objects</param>
/// <returns></returns>
public static object CallFunctionInScript(Context ctx, FunctionExpr function, string functionName, List<Expr> paramListExpressions, List<object> paramVals, bool resolveParams)
{
// 1. Determine if any parameters provided.
var hasParams = paramListExpressions != null && paramListExpressions.Count > 0;
// 2. Resolve parameters if necessary
if (resolveParams && function != null && (function.HasArguments || hasParams))
ParamHelper.ResolveParametersForScriptFunction(function.Meta, paramListExpressions, paramVals);
// 3. Assign the argument values to the function and evaluate.
function.ArgumentValues = paramVals;
function.Evaluate();
object result = null;
if (function.HasReturnValue)
result = function.ReturnValue;
else
result = LObjects.Null;
return result;
}
public object VisitFunction(FunctionExpr expr)
{
return null;
}
/// <summary>
/// Call a fluent script function from c#.
/// </summary>
/// <param name="context">The context of the call.</param>
/// <param name="expr">The lambda function</param>
/// <param name="convertApplicableTypes">Whether or not to convert applicable c# types to fluentscript types, eg. ints and longs to double, List(object) to LArrayType and Dictionary(string, object) to LMapType</param>
/// <param name="args"></param>
public static object CallFunctionViaCSharpUsingLambda(Context context, FunctionExpr expr, bool convertApplicableTypes, params object[] args)
{
var argsList = args.ToList<object>();
if (convertApplicableTypes)
LangTypeHelper.ConvertToLangTypeValues(argsList);
var execution = new Execution();
execution.Ctx = context;
if (EvalHelper.Ctx == null)
EvalHelper.Ctx = context;
var result = FunctionHelper.CallFunctionInScript(context, expr, expr.Meta.Name, null, argsList, false, execution);
return result;
}
/// <summary>
/// Registers a custom function callback.
/// </summary>
/// <param name="pattern"></param>
/// <param name="stmt">The function</param>
public void Register(string pattern, FunctionExpr stmt)
{
_functions[pattern] = stmt;
_lcaseToFormaNameMap[pattern.ToLower()] = pattern;
}
private void PushParametersInScope(FunctionExpr expr)
{
// 1. Validate : any arguments.
if (expr.ArgumentValues == null || expr.ArgumentValues.Count == 0) return;
if (expr.Meta.Arguments == null || expr.Meta.Arguments.Count == 0) return;
// 2. Check if there is an parameter named "arguments"
var hasParameterNamedArguments = false;
if (expr.Meta.Arguments != null && expr.Meta.Arguments.Count > 0)
if (expr.Meta.ArgumentsLookup.ContainsKey("arguments"))
hasParameterNamedArguments = true;
// 3. Get the symbolscope of the inside of the function and see if any statements.
ISymbols symscope = null;
var hasStatements = expr.Statements != null && expr.Statements.Count > 0;
if (hasStatements)
symscope = expr.Statements[0].SymScope;
// 3. Add function arguments to scope
for (var ndx = 0; ndx < expr.Meta.Arguments.Count; ndx++)
{
var val = expr.ArgumentValues[ndx] as LObject;
var arg = expr.Meta.Arguments[ndx];
// 4. Clone primitive datatypes.
if (val.Type.IsPrimitiveType())
{
var copied = val.Clone();
expr.ArgumentValues[ndx] = copied;
}
// 5. Now, set the memory value of the parameter.
this.Ctx.Memory.SetValue(arg.Name, val);
// 6. Finally, update the symbol type
if (hasStatements)
{
var sym = symscope.GetSymbol(arg.Name);
if (sym != null && val.Type.TypeVal == TypeConstants.Function
&& sym.Category != SymbolCategory.Func)
{
SymbolHelper.ResetSymbolAsFunction(symscope, arg.Name, val);
}
}
}
// Finally add the arguments.
// NOTE: Any extra arguments will be part of the implicit "arguments" array.
if (!hasParameterNamedArguments)
{
var argArray = new LArray(expr.ArgumentValues);
expr.Ctx.Memory.SetValue("arguments", argArray);
}
}
private void InitializeFunctionCall(FunctionExpr expr)
{
// Keep track of total times this function was executed.
// Keep tract of total times this function caused an error
if (expr.ExecutionCount == long.MaxValue)
expr.ExecutionCount = 0;
else
expr.ExecutionCount++;
if (expr.ErrorCount == long.MaxValue)
expr.ErrorCount = 0;
expr.ContinueRunning = true;
expr.ReturnValue = null;
expr.HasReturnValue = false;
PushParametersInScope(expr);
}
public object VisitFunction(FunctionExpr expr)
{
InitializeFunctionCall(expr);
try
{
if (expr.Statements == null || expr.Statements.Count == 0)
return LObjects.Null;
foreach (var statement in expr.Statements)
{
statement.Evaluate(this);
if (!expr.ContinueRunning) break;
}
}
catch (Exception ex)
{
expr.ErrorCount++;
throw ex;
}
return LObjects.Null;
}
public Expr OnParseLambda()
{
var tokenIt = this._parser.TokenIt;
var initiatorToken = tokenIt.NextToken;
// <codeLambda>
// Check for lambda or function declare.
var next = tokenIt.Peek();
if (next.Token != Tokens.LeftParenthesis)
{
return OnParseFunctionDeclare();
}
// This a lambda.
var expr = new LambdaExpr();
var funcExp = new FunctionExpr();
expr.Expr = funcExp;
expr.Expr.Meta = new FunctionMetaData();
this._parser.SetupContext(funcExp, initiatorToken);
var name = "anon_" + initiatorToken.Line + "_" + initiatorToken.LineCharPos;
tokenIt.Advance();
tokenIt.Expect(Tokens.LeftParenthesis);
var argnames = _parser.ParseNames();
funcExp.Meta.Init(name, argnames);
tokenIt.Expect(Tokens.RightParenthesis);
this.OnParseLambdaBlock(funcExp);
// </codeLambda>
this._parser.SetupContext(expr, initiatorToken);
return expr;
}