In C# I’m loading and compiling a script like this:-
_engine = Python.CreateEngine();
_scope = _engine.CreateScope();
_scriptSource = _engine.CreateScriptSourceFromFile(filename,
Encoding.UTF7, SourceCodeKind.Statements);
_compiledScript = _scriptSource.Compile();
(At some point in time my application will run the script by calling
_compiledScript.Execute(_scope).)
I’ve also got a FileSystemWatcher watching the script file. When the file
changes I recreate the ScriptSource and compile, basically executing those last
two lines again. When I do this, _scriptSource.Compile() throws an
ArgumentException (“Invalid argument valueParameter name: start”). The stack
trace is below. It works if I re-create *everything* – the engine, scope,
script source, compile, but this seems a bit a wasteful. Am I missing something?
Stack trace:-
at Microsoft.Scripting.Utils.ContractUtils.Requires(Boolean precondition,
String paramName)
at Microsoft.Scripting.SourceUnit.GetCodeLines(Int32 start, Int32 count)
at Microsoft.Scripting.SourceUnit.GetCodeLine(Int32 line)
at Microsoft.Scripting.SyntaxErrorException..ctor(String message, SourceUnit
sourceUnit, SourceSpan span, Int32 errorCode, Severity severity)
at Microsoft.Scripting.Hosting.ErrorListenerProxySink.Add(SourceUnit
sourceUnit, String message, SourceSpan span, Int32 errorCode, Severity severity)
at IronPython.Compiler.Parser.CreateParserWorker(CompilerContext context,
PythonOptions options, Boolean verbatim)
at IronPython.Compiler.Parser.CreateParser(CompilerContext context,
PythonOptions options)
at IronPython.Runtime.PythonContext.ParseAndBindAst(CompilerContext context)
at IronPython.Runtime.PythonContext.CompilePythonCode(SourceUnit sourceUnit,
CompilerOptions options, ErrorSink errorSink)
at IronPython.Runtime.PythonContext.CompileSourceCode(SourceUnit sourceUnit,
CompilerOptions options, ErrorSink errorSink)
at Microsoft.Scripting.SourceUnit.Compile(CompilerOptions options, ErrorSink
errorSink)
at Microsoft.Scripting.SourceUnit.Compile(ErrorSink errorSink)
at Microsoft.Scripting.Hosting.ScriptSource.CompileInternal(CompilerOptions
compilerOptions, ErrorListener errorListener)
at Microsoft.Scripting.Hosting.ScriptSource.Compile()
Andrew Stephens
Senior Software Engineer
Nu Instruments Ltd
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