public AstRoot Parse ()
{
try {
AstRoot root = new AstRoot (tokenStream.Location);
while (!tokenStream.EndOfStream) {
root.Add (ParseStatement (tokenStream));
}
return root;
} catch (Exception) {
return new AstRoot (tokenStream.Location);
} finally {
if (tokenStream.ErrorLog.ErrorCount > 0) {
throw new SyntaxException (tokenStream.ErrorLog);
}
}
}
private static AstNode ParseGiven(TokenStream stream)
{
GivenStatement switchStmt = new GivenStatement (stream.Location);
stream.Expect (TokenClass.Keyword, "given");
stream.Expect (TokenClass.OpenParan);
switchStmt.Add (ParseExpression (stream));
stream.Expect (TokenClass.CloseParan);
stream.Expect (TokenClass.OpenBrace);
AstNode defaultBlock = new AstRoot (stream.Location);
AstRoot caseStatements = new AstRoot (stream.Location);
while (!stream.EndOfStream && !stream.Match (TokenClass.CloseBrace)) {
caseStatements.Add (ParseWhen (stream));
if (stream.Accept (TokenClass.Keyword, "default")) {
defaultBlock = ParseStatement (stream);
}
}
switchStmt.Add (caseStatements);
switchStmt.Add (defaultBlock);
stream.Expect (TokenClass.CloseBrace);
return switchStmt;
}
private static AstNode ParseFunction(TokenStream stream, bool prototype = false,
ClassDeclaration cdecl = null)
{
if (stream.Accept (TokenClass.Operator, "@")) {
/*
* Function decorators in the form of
* @myDecorator
* func foo () {
* }
* are merely syntatic sugar for
* func foo () {
* }
* foo = myDecorator (foo)
*/
AstNode expr = ParseExpression (stream); // Decorator expression
/* This is the original function which is to be decorated */
FunctionDeclaration idecl = ParseFunction (stream, prototype, cdecl) as FunctionDeclaration;
/* We must construct an arglist which will be passed to the decorator */
ArgumentList args = new ArgumentList (stream.Location);
args.Add (new NameExpression (stream.Location, idecl.Name));
/*
* Since two values can not be returned, we must return a single node containing both
* the function declaration and call to the decorator
*/
AstRoot nodes = new AstRoot (stream.Location);
nodes.Add (idecl);
nodes.Add (new Expression (stream.Location, new BinaryExpression (stream.Location,
BinaryOperation.Assign,
new NameExpression (stream.Location, idecl.Name),
new CallExpression (stream.Location, expr, args))));
return nodes;
}
stream.Expect (TokenClass.Keyword, "func");
bool isInstanceMethod;
bool isVariadic;
bool hasKeywordArgs;
Token ident = stream.Expect (TokenClass.Identifier);
List<string> parameters = ParseFuncParameters (stream,
out isInstanceMethod,
out isVariadic,
out hasKeywordArgs);
FunctionDeclaration decl = new FunctionDeclaration (stream.Location, ident != null ?
ident.Value : "",
isInstanceMethod,
isVariadic,
hasKeywordArgs,
parameters);
if (!prototype) {
if (stream.Accept (TokenClass.Operator, "=>")) {
decl.Add (new ReturnStatement (stream.Location, ParseExpression (stream)));
} else {
stream.Expect (TokenClass.OpenBrace);
CodeBlock scope = new CodeBlock (stream.Location);
if (stream.Match (TokenClass.Keyword, "super")) {
scope.Add (ParseSuperCall (stream, cdecl));
}
while (!stream.Match (TokenClass.CloseBrace)) {
scope.Add (ParseStatement (stream));
}
decl.Add (scope);
stream.Expect (TokenClass.CloseBrace);
}
}
return decl;
}
public AstRoot Parse()
{
try {
AstRoot root = new AstRoot (tokenStream.Location);
while (!tokenStream.EndOfStream) {
root.Add (ParseStatement (tokenStream));
}
return root;
} catch (Exception) {
//this.tokenStream.ErrorLog.AddError (ErrorType.ParserError, "");
return new AstRoot (tokenStream.Location);
}
}
