/// <summary>
/// Initialize
/// </summary>
public ExecPlugin()
{
this.Init("exec");
_funcMeta = new FunctionMetaData("exec", null);
_funcMeta.AddArg("program", "string", true, "", string.Empty, @"c:\tools\nunit\nunit.exe", "program to launch");
_funcMeta.AddArg("workingdir", "string", false, "in", string.Empty, @"c:\tools\nunit\", "working directory to launch in");
_funcMeta.AddArg("args", "list", false, "", string.Empty, "", "arguments to the program");
_funcMeta.AddArg("failOnError","bool", false, "", false, "", "arguments to the program");
}
private static IDictionary<Token, bool> BuildEndTokens(bool enableNewLineAsEnd, FunctionMetaData meta)
{
var endTokens = new Dictionary<Token, bool>();
var formalEndTokens = enableNewLineAsEnd ? Terminators.ExpFluentFuncExpParenEnd : Terminators.ExpFuncExpEnd;
foreach (var pair in formalEndTokens)
endTokens[pair.Key] = true;
if (meta == null) return endTokens;
// Go through all the arguments and use the
if (meta.ArgumentsLookup != null && meta.ArgumentsLookup.Count > 0)
{
// Add all the parameter names and aliases to the map.
foreach (var pair in meta.ArgumentsLookup)
{
var idToken = TokenBuilder.ToIdentifier(pair.Value.Name);
endTokens[idToken] = true;
if (!string.IsNullOrEmpty(pair.Value.Alias))
{
idToken = TokenBuilder.ToIdentifier(pair.Value.Alias);
endTokens[idToken] = true;
}
}
}
return endTokens;
}
/// <summary>
/// Parses parameters.
/// </summary>
/// <param name="args">The list of arguments to store.</param>
/// <param name="tokenIt">The token iterator</param>
/// <param name="parser">The parser</param>
/// <param name="meta">The function meta for checking parameters</param>
/// <param name="expectParenthesis">Whether or not to expect parenthis to designate the start of the parameters.</param>
/// <param name="enableNewLineAsEnd">Whether or not to treat a newline as end</param>
public static void ParseFuncParameters(List<Expr> args, TokenIterator tokenIt, Parser.Parser parser, bool expectParenthesis, bool enableNewLineAsEnd, FunctionMetaData meta)
{
int totalParameters = 0;
if (tokenIt.NextToken.Token == Tokens.LeftParenthesis)
expectParenthesis = true;
// START with check for "("
if (expectParenthesis) tokenIt.Expect(Tokens.LeftParenthesis);
bool passNewLine = !enableNewLineAsEnd;
var endTokens = BuildEndTokens(enableNewLineAsEnd, meta);
int totalNamedParams = 0;
var hasMetaArguments = meta != null && meta.ArgumentNames != null && meta.ArgumentNames.Count > 0;
while (true)
{
Expr exp = null;
// Check for end of statment or invalid end of script.
if (parser.IsEndOfParameterList(Tokens.RightParenthesis, enableNewLineAsEnd))
break;
if (tokenIt.NextToken.Token == Tokens.Comma)
tokenIt.Advance();
var token = tokenIt.NextToken.Token;
var peek = tokenIt.Peek().Token;
var isVar = parser.Context.Symbols.Contains(token.Text);
var isParamNameMatch = hasMetaArguments && meta.ArgumentsLookup.ContainsKey(token.Text);
var isKeywordParamName = token.Kind == TokenKind.Keyword && isParamNameMatch;
// CASE 1: Named params for external c# object method calls
// CASE 2: Named params for internal script functions ( where we have access to its param metadata )
if ( (meta == null && token.Kind == TokenKind.Ident && peek == Tokens.Colon )
|| (token.Kind == TokenKind.Ident && isParamNameMatch && !isVar)
|| (token.Kind == TokenKind.Ident && !isParamNameMatch && !isVar && peek == Tokens.Colon)
|| (isKeywordParamName && !isVar ) )
{
var paramName = token.Text;
var namedParamToken = tokenIt.NextToken;
tokenIt.Advance();
// Advance and check if ":"
if (tokenIt.NextToken.Token == Tokens.Colon)
tokenIt.Advance();
exp = parser.ParseExpression(endTokens, true, false, true, passNewLine, true);
exp = Exprs.NamedParam(paramName, exp, namedParamToken);
args.Add(exp);
totalNamedParams++;
}
// CASE 2: Name of variable being passed to function is same as one of the parameter names.
else if (isVar && hasMetaArguments && meta.ArgumentsLookup.ContainsKey(token.Text))
{
// Can not have normal parameters after named parameters.
if (totalNamedParams > 0)
throw tokenIt.BuildSyntaxException("Un-named parameters must come before named parameters");
var next = tokenIt.Peek();
if (next.Token.Kind == TokenKind.Symbol)
exp = parser.ParseExpression(endTokens, true, false, true, passNewLine, false);
else
exp = parser.ParseIdExpression(null, null, false);
args.Add(exp);
}
// CASE 3: Normal param
else
{
// Can not have normal parameters after named parameters.
if (totalNamedParams > 0)
throw tokenIt.BuildSyntaxException("Un-named parameters must come before named parameters");
exp = parser.ParseExpression(endTokens, true, false, true, passNewLine, true);
args.Add(exp);
}
totalParameters++;
parser.Context.Limits.CheckParserFunctionParams(exp, totalParameters);
// Check for end of statment or invalid end of script.
if (parser.IsEndOfParameterList(Tokens.RightParenthesis, enableNewLineAsEnd))
break;
// Advance if not using fluent-parameters
if(meta == null)
tokenIt.Expect(Tokens.Comma);
}
// END with check for ")"
if (expectParenthesis) tokenIt.Expect(Tokens.RightParenthesis);
}
/// <summary>
/// Creates functionmetadata object with the supplied inputs.
/// </summary>
/// <param name="memberType">What type of member e.g. property,function.</param>
/// <param name="name">The name of the function</param>
/// <param name="implementationMethod">The method that implements the funcion in this host language.</param>
/// <param name="returnType">The return values type</param>
/// <param name="description">Description of the function.</param>
/// <returns></returns>
private FunctionMetaData AddMethodInfo(MemberTypes memberType, string name, string implementationMethod, Type returnType, string description, bool convertParams)
{
var funcdef = new FunctionMetaData(name, null);
funcdef.Doc = new DocTags();
// Todo:
funcdef.ReturnType = LangTypeHelper.ConvertToLangType(returnType);
funcdef.Doc.Summary = description;
var mappedMethod = new MappedMethod();
mappedMethod.DataTypeMethod = name;
mappedMethod.HostLanguageMethod = implementationMethod;
mappedMethod.FuncDef = funcdef;
mappedMethod.ConvertParameters = convertParams;
_methodMap[name] = mappedMethod;
_allMembersMap[name] = memberType;
return funcdef;
}
/// <summary>
/// Initailizes with function metadata.
/// </summary>
/// <param name="meta"></param>
public void Init(FunctionMetaData meta)
{
this.Meta = meta;
ParamList = new List<object>();
ParamListExpressions = new List<Expr>();
}
/// <summary>
/// Metadata about the function.
/// </summary>
/// <param name="meta"></param>
public ExecExpr(FunctionMetaData meta)
{
this.Init(meta);
}
/// <summary>
/// Resolve the parameters in the function call.
/// </summary>
/// <param name="meta">The function metadata</param>
/// <param name="paramListExpressions">The list of expressions that should be evaulated first to pass as parameters</param>
/// <param name="paramList">The list of parameters to a populate from paramListExpressions</param>
/// <param name="visitor">The visitor that will evaulate the expressions.</param>
public static void ResolveParametersForScriptFunction(FunctionMetaData meta, List<Expr> paramListExpressions, List<object> paramList, IAstVisitor visitor)
{
int totalParams = meta.Arguments == null ? 0 : meta.Arguments.Count;
ResolveParameters(totalParams, paramListExpressions, paramList,
namedParam => meta.ArgumentsLookup[namedParam.Name].Index,
namedParam => meta.ArgumentsLookup.ContainsKey(namedParam.Name), visitor);
}
