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Added very simple universal function call syntax (method sugar)

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This commit is contained in:
Jonathan Turner
2009-06-03 19:12:13 +00:00
parent ea1b1b925a
commit 470c5e30b7
1 changed files with 22 additions and 4 deletions
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26
wesley/main.cpp
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@@ -16,13 +16,13 @@
class TokenType { public: enum Type { File, Whitespace, Identifier, Number, Operator, Parens_Open, Parens_Close,
Square_Open, Square_Close, Curly_Open, Curly_Close, Comma, Quoted_String, Single_Quoted_String, Carriage_Return, Semicolon,
Function_Def, Scoped_Block, Statement, Equation, Return, Expression, Term, Factor, Negate, Comment,
Value, Fun_Call }; };
Value, Fun_Call, Method_Call }; };
char *tokentype_to_string(int tokentype) {
char *token_types[] = {"File", "Whitespace", "Identifier", "Number", "Operator", "Parens_Open", "Parens_Close",
"Square_Open", "Square_Close", "Curly_Open", "Curly_Close", "Comma", "Quoted_String", "Single_Quoted_String", "Carriage_Return", "Semicolon",
"Function_Def", "Scoped_Block", "Statement", "Equation", "Return", "Expression", "Term", "Factor", "Negate", "Comment",
"Value", "Fun_Call" };
"Value", "Fun_Call", "Method_Call" };
return token_types[tokentype];
}
@@ -151,6 +151,22 @@ Boxed_Value eval_token(BoxedCPP_System ss, TokenPtr node) {
}
}
break;
case (TokenType::Method_Call) : {
Param_List_Builder plb;
plb << eval_token(ss, node->children[0]);
for (i = 1; i < node->children[1]->children.size(); ++i) {
plb << eval_token(ss, node->children[1]->children[i]);
}
try {
retval = dispatch(ss.get_function(node->children[1]->children[0]->text), plb);
}
catch(std::exception &e){
throw EvalError("Can not find appropriate '" + node->children[0]->text + "'");
}
}
break;
case (TokenType::Scoped_Block) :
case (TokenType::Statement) :
case (TokenType::Return) :
@@ -184,13 +200,15 @@ Rule build_parser_rules() {
Rule factor(TokenType::Factor);
Rule negate(TokenType::Negate);
Rule funcall(TokenType::Fun_Call);
Rule methodcall(TokenType::Method_Call);
Rule value;
Rule rule = *(expression >> *Ign(Id(TokenType::Semicolon)));
expression = term >> *((Str("+") >> term) | (Str("-") >> term));
term = factor >> *((Str("*") >> factor) | (Str("/") >> factor));
factor = value | negate | (Ign(Str("+")) >> value);
factor = methodcall | value | negate | (Ign(Str("+")) >> value);
funcall = Id(TokenType::Identifier) >> Ign(Id(TokenType::Parens_Open)) >> ~(expression >> *(Ign(Str("," )) >> expression)) >> Ign(Id(TokenType::Parens_Close));
methodcall = value >> Ign(Str(".")) >> funcall;
negate = Ign(Str("-")) >> factor;
value = (Ign(Id(TokenType::Parens_Open)) >> expression >> Ign(Id(TokenType::Parens_Close))) |
@@ -209,7 +227,7 @@ Lexer build_lexer() {
lexer << Pattern("[A-Za-z_]+", TokenType::Identifier);
lexer << Pattern("[0-9]+(\\.[0-9]+)?", TokenType::Number);
lexer << Pattern("[!@#$%^&*\\-+=<>]+|/[!@#$%^&\\-+=<>]*", TokenType::Operator);
lexer << Pattern("[!@#$%^&*\\-+=<>.]+|/[!@#$%^&\\-+=<>]*", TokenType::Operator);
lexer << Pattern("\\(", TokenType::Parens_Open);
lexer << Pattern("\\)", TokenType::Parens_Close);
lexer << Pattern("\\[", TokenType::Square_Open);