ExprAST *Parser::parsePrimary ()
{
// At the top level, we have to have either an identifier of some kind,
// a number, or an open paren. We might also have a unary minus sign, handle
// that specially right here.
switch (currentToken)
{
case TOKEN_IDENTIFIER_FUNCTION:
return parseFunctionIdentifierExpr ();
case TOKEN_IDENTIFIER_CONSTANT:
return parseConstantIdentifierExpr ();
case TOKEN_IDENTIFIER_VARIABLE:
return parseVariableIdentifierExpr ();
case TOKEN_NUMBER:
return parseNumberExpr ();
case TOKEN_PAREN_OPEN:
return parseOpenParenExpr ();
case TOKEN_OPERATOR:
if (strToken == "-")
return parseUnaryMinusExpr ();
// Fall through for any other operator
default:
error (boost::format ("Expecting an expression, got %1% instead!") %
formatToken ());
return NULL;
}
}
std::unique_ptr<ExprAST> Parser::parsePrimary(s_cursor_t &it, const s_cursor_t &end) {
switch (_curTok) {
case tok_identifier:
return parseIdentifierExpr(it, end);
case tok_number:
return parseNumberExpr(it, end);
case '(':
return parseParenExpr(it, end);
default:
return Error("unknown token when expecting an expression");
}
}