static nxt_int_t
njs_parser_unary_plus_expression(njs_vm_t *vm, njs_parser_t *parser,
njs_token_t token, const void *data)
{
return njs_parser_unary_expression(vm, parser,
NJS_TOKEN_UNARY_PLUS, data);
}
static nxt_int_t
njs_parser_unary_negation_expression(njs_vm_t *vm, njs_parser_t *parser,
njs_token_t token, const void *data)
{
return njs_parser_unary_expression(vm, parser,
NJS_TOKEN_UNARY_NEGATION, data);
}
static njs_token_t
njs_parser_unary_expression(njs_vm_t *vm, njs_parser_t *parser,
const njs_parser_expression_t *expr, njs_token_t token)
{
double num;
njs_token_t next;
njs_parser_node_t *node;
njs_vmcode_operation_t operation;
switch (token) {
case NJS_TOKEN_ADDITION:
token = NJS_TOKEN_UNARY_PLUS;
operation = njs_vmcode_unary_plus;
break;
case NJS_TOKEN_SUBSTRACTION:
token = NJS_TOKEN_UNARY_NEGATION;
operation = njs_vmcode_unary_negation;
break;
case NJS_TOKEN_LOGICAL_NOT:
operation = njs_vmcode_logical_not;
break;
case NJS_TOKEN_BITWISE_NOT:
operation = njs_vmcode_bitwise_not;
break;
case NJS_TOKEN_TYPEOF:
operation = njs_vmcode_typeof;
break;
case NJS_TOKEN_VOID:
operation = njs_vmcode_void;
break;
case NJS_TOKEN_DELETE:
operation = njs_vmcode_delete;
break;
default:
return njs_parser_inc_dec_expression(vm, parser, token);
}
next = njs_parser_token(parser);
if (nxt_slow_path(next <= NJS_TOKEN_ILLEGAL)) {
return next;
}
next = njs_parser_unary_expression(vm, parser, NULL, next);
if (nxt_slow_path(next <= NJS_TOKEN_ILLEGAL)) {
return next;
}
if (token == NJS_TOKEN_UNARY_PLUS
&& parser->node->token == NJS_TOKEN_NUMBER)
{
/* Skip the unary plus of number. */
return next;
}
if (token == NJS_TOKEN_UNARY_NEGATION
&& parser->node->token == NJS_TOKEN_NUMBER)
{
/* Optimization of common negative number. */
node = parser->node;
num = -node->u.value.data.u.number;
node->u.value.data.u.number = num;
node->u.value.data.truth = njs_is_number_true(num);
return next;
}
if (token == NJS_TOKEN_TYPEOF
&& parser->node->token == NJS_TOKEN_NAME)
{
parser->node->state = NJS_VARIABLE_TYPEOF;
} else if (token == NJS_TOKEN_DELETE
&& parser->node->token == NJS_TOKEN_PROPERTY)
{
parser->node->token = NJS_TOKEN_PROPERTY_DELETE;
parser->node->u.operation = njs_vmcode_property_delete;
parser->code_size += sizeof(njs_vmcode_3addr_t);
return next;
}
node = njs_parser_node_alloc(vm);
if (nxt_slow_path(node == NULL)) {
return NJS_TOKEN_ERROR;
}
node->token = token;
node->u.operation = operation;
node->left = parser->node;
node->left->dest = node;
parser->node = node;
parser->code_size += sizeof(njs_vmcode_2addr_t);
return next;
}