/// <summary>
/// Creates a function based on an expression. Ex: "x + 1"
/// </summary>
public ScriptFunction(IScriptEngineFactory engineFactory, IEnumerable<string> argumentNames, string expression, bool addReturnStatement)
{
this.engineFactory = engineFactory;
this.expression = expression;
// generate the javascript for the function
StringBuilder argsDecl = new StringBuilder();
foreach (string arg in argumentNames)
{
if (argsDecl.Length > 0)
argsDecl.Append(",");
argsDecl.Append(arg);
}
if(addReturnStatement)
functionBody = "(" + argsDecl + "){return (" + expression + ");}";
else
functionBody = "(" + argsDecl + "){ " + expression + " }";
// assign a unique name to this function
lock (functionNames)
{
if (!functionNames.TryGetValue(functionBody, out functionName))
{
functionName = "_func_" + functionNames.Count;
functionNames.Add(functionBody, functionName);
}
}
// Verify the syntax of the function. This will also register the function with the current script engine.
EnsureCompiled(engineFactory.GetScriptEngine());
}
static Func <object, object> CreateScriptFunction(string argName1, string expression, IScriptEngineFactory factory, bool addReturnStatement)
{
ScriptFunction function = new ScriptFunction(factory, new string[] { argName1 }, expression, addReturnStatement);
Marshaler marshaler = new Marshaler(factory.GetScriptEngine());
return((a) => function.Evaluate(new object[] { a }, marshaler));
}
public object Evaluate(IEnumerable <object> arguments, Marshaler marshaler)
{
ScriptEngine engine = engineFactory.GetScriptEngine();
EnsureCompiled(engine);
// call the function
object[] wrappedArgs = arguments.Select(marshaler.Wrap).ToArray();
object result;
try
{
result = engine.CallGlobalFunction(functionName, wrappedArgs);
}
catch (Jurassic.JavaScriptException err)
{
throw new ScriptFunctionEvaluationException(expression, err);
}
return(marshaler.Unwrap(result));
}
/// <summary>
/// Creates a function based on an expression. Ex: "x + 1"
/// </summary>
public ScriptFunction(IScriptEngineFactory engineFactory, IEnumerable <string> argumentNames, string expression, bool addReturnStatement)
{
this.engineFactory = engineFactory;
this.expression = expression;
// generate the javascript for the function
StringBuilder argsDecl = new StringBuilder();
foreach (string arg in argumentNames)
{
if (argsDecl.Length > 0)
{
argsDecl.Append(",");
}
argsDecl.Append(arg);
}
if (addReturnStatement)
{
functionBody = "(" + argsDecl + "){return (" + expression + ");}";
}
else
{
functionBody = "(" + argsDecl + "){ " + expression + " }";
}
// assign a unique name to this function
lock (functionNames)
{
if (!functionNames.TryGetValue(functionBody, out functionName))
{
functionName = "_func_" + functionNames.Count;
functionNames.Add(functionBody, functionName);
}
}
// Verify the syntax of the function. This will also register the function with the current script engine.
EnsureCompiled(engineFactory.GetScriptEngine());
}
public IScriptEngine GetEngineByName(string shortName)
{
if (shortName == null)
{
throw new NullReferenceException(); // NullPointerException();
}
//look for registered name first
Object obj = nameAssociations.ContainsKey(shortName) ? nameAssociations[shortName] : null;
if (null != obj)
{
IScriptEngineFactory spi = (IScriptEngineFactory)obj;
try
{
IScriptEngine engine = spi.GetScriptEngine();
engine.SetBindings(GetBindings(), ScriptContext_Fields.GLOBAL_SCOPE);
return(engine);
}
catch (System.Exception exp)
{
throw exp;
//if (DEBUG) exp.printStackTrace();
}
}
foreach (IScriptEngineFactory spi in engineSpis)
{
IList <String> names = null;
try
{
names = spi.Names;
}
catch (System.Exception exp)
{
throw exp;
//if (DEBUG) exp.printStackTrace();
}
if (names != null)
{
foreach (String name in names)
{
if (shortName.Equals(name))
{
try
{
IScriptEngine engine = spi.GetScriptEngine();
engine.SetBindings(GetBindings(), ScriptContext_Fields.GLOBAL_SCOPE);
return(engine);
}
catch (System.Exception exp)
{
throw exp;
//if (DEBUG) exp.printStackTrace();
}
}
}
}
}
return(null);
}
