/// <summary>
/// Allocates a new expression. This call fails if the scope was already compiled
/// </summary>
/// <param name="scope">A valid identifier for namespace sub-path like "mycode.test" no leading or trailing "."</param>
/// <param name="expression">A C# expression to compile</param>
/// <param name="referencedAssemblies"> An enumerable of assemblies that compiler should reference while building scope assembly i.e. "MyCompany.dll"</param>
/// <param name="usings">Extra usings i.e. "System.IO", "MyCode.Routines" etc.</param>
public CompilingExpressionEvaluator(string scope,
string expression,
IEnumerable <string> referencedAssemblies = null,
IEnumerable <string> usings = null)
{
if (string.IsNullOrWhiteSpace(scope) ||
string.IsNullOrWhiteSpace(expression))
{
throw new ArgumentException(StringConsts.ARGUMENT_ERROR + "CompilingExpressionEvaluator(scope,expression)");
}
m_Scope = scope.Trim();
m_Expression = expression;
_ScopeData sdata = null;
lock (_G.s_Scopes)
{
if (!_G.s_Scopes.TryGetValue(scope, out sdata))
{
sdata = new _ScopeData();
_G.s_Scopes.Add(scope, sdata);
}
if (sdata.Assembly != null)
{
throw new NFXException(StringConsts.CAN_NOT_CREATE_MORE_SCOPE_EXPRESSIONS_ERROR + scope);
}
if (sdata.CompileException != null)
{
throw new NFXException(StringConsts.CAN_NOT_ADD_FAILED_SCOPE_COMPILE_ERROR + scope, sdata.CompileException);
}
sdata.m_Expressions.Add(this);
if (referencedAssemblies != null)
{
foreach (var ass in referencedAssemblies)
{
if (!sdata.m_ReferencedAssemblies.Contains(ass))
{
sdata.m_ReferencedAssemblies.Add(ass);
}
}
}
if (usings != null)
{
foreach (var use in usings)
{
if (!sdata.m_Usings.Contains(use))
{
sdata.m_Usings.Add(use);
}
}
}
}
}
/// <summary>
/// Indicates whether this scope has already been compiled and no more epressions can be allocated in it
/// </summary>
public static bool IsScopeAlreadyCompiled(string scope)
{
_ScopeData sdata = null;
lock (_G.s_Scopes)
{
if (_G.s_Scopes.TryGetValue(scope, out sdata))
{
if (sdata.Assembly != null || sdata.CompileException != null)
{
return(true);
}
}
}
return(false);
}
private void doCompile(_ScopeData sdata)
{
CSharpCodeProvider comp = new CSharpCodeProvider();
CompilerParameters cp = new CompilerParameters();
foreach (var ass in sdata.m_ReferencedAssemblies)
{
cp.ReferencedAssemblies.Add(ass);
}
cp.GenerateExecutable = false;
cp.GenerateInMemory = true;
var ns = "NFX.Parsing.CompilingExpressionEvaluator." + m_Scope;
StringBuilder code = new StringBuilder();
foreach (var use in sdata.m_Usings)
{
code.AppendLine("using " + use + ";");
}
code.AppendLine("namespace " + ns + " { ");
code.AppendLine(" public static class Evaluator { ");
for (var i = 0; i < sdata.m_Expressions.Count; i++)
{
var expr = sdata.m_Expressions[i];
code.AppendLine(
string.Format(" public static {0} DoEval_{1}({2} ctx, {3} arg)",
tname(typeof(TResult)),
i,
tname(typeof(TContext)),
tname(typeof(TArg))
)
);
code.AppendLine(" { ");
code.AppendLine(" return (" + expr.m_Expression + ");");
code.AppendLine(" } ");
code.AppendLine();
} //for
code.AppendLine("}"); //class
code.AppendLine("}"); //namespace
CompilerResults cr = comp.CompileAssemblyFromSource(cp, code.ToString());
if (cr.Errors.HasErrors)
{
StringBuilder error = new StringBuilder();
error.Append("Error Compiling Expression: ");
foreach (CompilerError err in cr.Errors)
{
error.AppendFormat("{0}\n", err.ErrorText);
}
sdata.CompileException = new NFXException(StringConsts.EXPRESSION_SCOPE_COMPILE_ERROR + error.ToString());
return;
}
sdata.Assembly = cr.CompiledAssembly;
for (var i = 0; i < sdata.m_Expressions.Count; i++)
{
var expr = sdata.m_Expressions[i];
var type = sdata.Assembly.GetType(ns + ".Evaluator");
var method = type.GetMethod("DoEval_" + i.ToString());
expr.m_EvalMethod = method;
}
}
private void doCompile(_ScopeData sdata)
{
#warning Implement using PAL
//CSharpCodeProvider comp = new CSharpCodeProvider();
// CompilerParameters cp = new CompilerParameters();
// foreach(var ass in sdata.m_ReferencedAssemblies)
// cp.ReferencedAssemblies.Add(ass);
// cp.GenerateExecutable = false;
// cp.GenerateInMemory = true;
// var ns = "Azos.Text.CompilingExpressionEvaluator."+m_Scope;
// StringBuilder code = new StringBuilder();
// foreach(var use in sdata.m_Usings)
// code.AppendLine("using " + use + ";");
// code.AppendLine("namespace "+ns+" { ");
// code.AppendLine(" public static class Evaluator { ");
// for(var i=0; i<sdata.m_Expressions.Count; i++)
// {
// var expr = sdata.m_Expressions[i];
// code.AppendLine(
// string.Format(" public static {0} DoEval_{1}({2} ctx, {3} arg)",
// tname(typeof(TResult)),
// i,
// tname(typeof(TContext)),
// tname(typeof(TArg))
// )
// );
// code.AppendLine(" { ");
// code.AppendLine(" return (" + expr.m_Expression + ");");
// code.AppendLine(" } ");
// code.AppendLine();
// }//for
// code.AppendLine("}");//class
// code.AppendLine("}");//namespace
// CompilerResults cr = comp.CompileAssemblyFromSource(cp, code.ToString());
// if (cr.Errors.HasErrors)
// {
// StringBuilder error = new StringBuilder();
// error.Append("Error Compiling Expression: ");
// foreach (CompilerError err in cr.Errors)
// {
// error.AppendFormat("{0}\n", err.ErrorText);
// }
// sdata.CompileException = new AzosException(StringConsts.EXPRESSION_SCOPE_COMPILE_ERROR + error.ToString());
// return;
// }
// sdata.Assembly = cr.CompiledAssembly;
// for(var i=0; i<sdata.m_Expressions.Count; i++)
// {
// var expr = sdata.m_Expressions[i];
// var type = sdata.Assembly.GetType(ns+".Evaluator");
// var method = type.GetMethod("DoEval_"+i.ToString());
// expr.m_EvalMethod = method;
// }
}