static sl_node_base_t*
regexp_expression(sl_parse_state_t* ps)
{
sl_token_t* re = expect_token(ps, SL_TOK_REGEXP);
sl_token_t* opts = expect_token(ps, SL_TOK_REGEXP_OPTS);
return sl_make_immediate_node(ps, sl_make_regexp(ps->vm,
re->as.str.buff, re->as.str.len,
opts->as.str.buff, opts->as.str.len));
}
static sl_node_base_t*
unary_expression(sl_parse_state_t* ps)
{
sl_node_base_t* expr;
sl_token_t* tok;
switch(peek_token(ps)->type) {
case SL_TOK_MINUS:
tok = next_token(ps);
expr = unary_expression(ps);
return sl_make_send_node(ps, expr, sl_intern(ps->vm, "negate"), 0, NULL);
case SL_TOK_TILDE:
tok = next_token(ps);
expr = unary_expression(ps);
return sl_make_send_node(ps, expr, sl_intern2(ps->vm, tok->str), 0, NULL);
case SL_TOK_NOT:
next_token(ps);
expr = unary_expression(ps);
return sl_make_unary_node(ps, expr, SL_NODE_NOT);
case SL_TOK_RETURN:
tok = next_token(ps);
if(!(ps->scope->flags & SL_PF_CAN_RETURN)) {
error(ps, sl_make_cstring(ps->vm, "Can't return outside of a method or lambda"), tok);
}
switch(peek_token(ps)->type) {
case SL_TOK_SEMICOLON:
case SL_TOK_CLOSE_BRACE:
case SL_TOK_CLOSE_TAG:
/* in these case we want to allow for postfix control structures: */
case SL_TOK_IF:
case SL_TOK_UNLESS:
return sl_make_unary_node(ps, sl_make_immediate_node(ps, ps->vm->lib.nil), SL_NODE_RETURN);
default:
return sl_make_unary_node(ps, low_precedence_logical_expression(ps), SL_NODE_RETURN);
}
break;
case SL_TOK_THROW:
next_token(ps);
return sl_make_unary_node(ps, low_precedence_logical_expression(ps), SL_NODE_THROW);
case SL_TOK_USE:
return use_expression(ps);
default:
return power_expression(ps);
}
}
static sl_node_base_t*
primary_expression(sl_parse_state_t* ps)
{
sl_token_t* tok;
sl_node_base_t* node;
switch(peek_token(ps)->type) {
case SL_TOK_INTEGER:
tok = next_token(ps);
return sl_make_immediate_node(ps, sl_integer_parse(ps->vm, tok->as.str.buff, tok->as.str.len));
case SL_TOK_FLOAT:
return sl_make_immediate_node(ps, sl_make_float(ps->vm, next_token(ps)->as.dbl));
case SL_TOK_STRING:
tok = next_token(ps);
return sl_make_immediate_node(ps, sl_make_string(ps->vm, tok->as.str.buff, tok->as.str.len));
case SL_TOK_REGEXP:
return regexp_expression(ps);
case SL_TOK_CONSTANT:
tok = next_token(ps);
return sl_make_const_node(ps, NULL, sl_intern2(ps->vm, sl_make_string(ps->vm, tok->as.str.buff, tok->as.str.len)));
case SL_TOK_IDENTIFIER:
tok = next_token(ps);
return sl_make_var_node(ps, SL_NODE_VAR,
sl_make_string(ps->vm, tok->as.str.buff, tok->as.str.len));
case SL_TOK_TRUE:
next_token(ps);
return sl_make_immediate_node(ps, ps->vm->lib._true);
case SL_TOK_FALSE:
next_token(ps);
return sl_make_immediate_node(ps, ps->vm->lib._false);
case SL_TOK_NIL:
next_token(ps);
return sl_make_immediate_node(ps, ps->vm->lib.nil);
case SL_TOK_SELF:
next_token(ps);
return sl_make_self_node(ps);
case SL_TOK_IVAR:
tok = next_token(ps);
node = sl_make_var_node(ps, SL_NODE_IVAR,
sl_make_string(ps->vm, tok->as.str.buff, tok->as.str.len));
return node;
case SL_TOK_CVAR:
tok = next_token(ps);
node = sl_make_var_node(ps, SL_NODE_CVAR,
sl_make_string(ps->vm, tok->as.str.buff, tok->as.str.len));
return node;
case SL_TOK_IF:
case SL_TOK_UNLESS:
return if_expression(ps);
case SL_TOK_WHILE:
case SL_TOK_UNTIL:
return while_expression(ps);
case SL_TOK_FOR:
return for_expression(ps);
case SL_TOK_CLASS:
return class_expression(ps);
case SL_TOK_DEF:
return def_expression(ps);
case SL_TOK_LAMBDA:
return lambda_expression(ps);
case SL_TOK_TRY:
return try_expression(ps);
case SL_TOK_OPEN_BRACKET:
return array_expression(ps);
case SL_TOK_OPEN_PAREN:
return bracketed_expression(ps);
case SL_TOK_OPEN_BRACE:
return dict_expression(ps);
case SL_TOK_NEXT:
tok = next_token(ps);
if(!(ps->scope->flags & SL_PF_CAN_NEXT_LAST)) {
error(ps, sl_make_cstring(ps->vm, "next invalid outside loop"), tok);
}
return sl_make_singleton_node(ps, SL_NODE_NEXT);
case SL_TOK_LAST:
tok = next_token(ps);
if(!(ps->scope->flags & SL_PF_CAN_NEXT_LAST)) {
error(ps, sl_make_cstring(ps->vm, "last invalid outside loop"), tok);
}
return sl_make_singleton_node(ps, SL_NODE_LAST);
case SL_TOK_RANGE_EX:
next_token(ps);
return sl_make_singleton_node(ps, SL_NODE_YADA_YADA);
default:
unexpected(ps, peek_token(ps));
return NULL;
}
}
static sl_node_base_t*
static_string_expression(sl_parse_state_t* ps)
{
sl_token_t* tok = expect_token(ps, SL_TOK_STRING);
return sl_make_immediate_node(ps, sl_make_string(ps->vm, tok->as.str.buff, tok->as.str.len));
}
