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Implement token pasting.

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Which makes test 40 now pass.
This commit is contained in:
Carl Worth 2010-05-26 09:04:50 -07:00
parent ce540f2571
commit ad0dee6bb0
1 changed files with 117 additions and 0 deletions
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117
glcpp-parse.y
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@ -586,6 +586,86 @@ _token_print (token_t *token)
}
}
/* Change 'token' into a new token formed by pasting 'other'. */
static void
_token_paste (token_t *token, token_t *other)
{
/* A very few single-character punctuators can be combined
* with another to form a multi-character punctuator. */
switch (token->type) {
case '<':
if (other->type == '<') {
token->type = LEFT_SHIFT;
token->value.ival = LEFT_SHIFT;
return;
} else if (other->type == '=') {
token->type = LESS_OR_EQUAL;
token->value.ival = LESS_OR_EQUAL;
return;
}
break;
case '>':
if (other->type == '>') {
token->type = RIGHT_SHIFT;
token->value.ival = RIGHT_SHIFT;
return;
} else if (other->type == '=') {
token->type = GREATER_OR_EQUAL;
token->value.ival = GREATER_OR_EQUAL;
return;
}
break;
case '=':
if (other->type == '=') {
token->type = EQUAL;
token->value.ival = EQUAL;
return;
}
break;
case '!':
if (other->type == '=') {
token->type = NOT_EQUAL;
token->value.ival = NOT_EQUAL;
return;
}
break;
case '&':
if (other->type == '&') {
token->type = AND;
token->value.ival = AND;
return;
}
break;
case '|':
if (other->type == '|') {
token->type = OR;
token->value.ival = OR;
return;
}
break;
}
/* Two string-valued tokens can usually just be mashed
* together.
*
* XXX: Since our 'OTHER' case is currently so loose, this may
* allow some things thruogh that should be treated as
* errors. */
if ((token->type == IDENTIFIER || token->type == OTHER) &&
(other->type == IDENTIFIER || other->type == OTHER))
{
token->value.str = talloc_strdup_append (token->value.str,
other->value.str);
return;
}
printf ("Error: Pasting \"");
_token_print (token);
printf ("\" and \"");
_token_print (other);
printf ("\" does not give a valid preprocessing token.\n");
}
static void
_token_list_print (token_list_t *list)
{
@ -870,6 +950,43 @@ _glcpp_parser_expand_function_onto (glcpp_parser_t *parser,
}
}
/* After argument substitution, and before further expansion
* below, implement token pasting. */
node = substituted->head;
while (node)
{
token_node_t *next_non_space;
/* Look ahead for a PASTE token, skipping space. */
next_non_space = node->next;
while (next_non_space && next_non_space->token->type == SPACE)
next_non_space = next_non_space->next;
if (next_non_space == NULL)
break;
if (next_non_space->token->type != PASTE) {
node = next_non_space;
continue;
}
/* Now find the next non-space token after the PASTE. */
next_non_space = next_non_space->next;
while (next_non_space && next_non_space->token->type == SPACE)
next_non_space = next_non_space->next;
if (next_non_space == NULL) {
fprintf (stderr, "Error: '##' cannot appear at either end of a macro expansion\n");
exit (1);
}
_token_paste (node->token, next_non_space->token);
node->next = next_non_space->next;
node = node->next;
}
_string_list_push (parser->active, identifier);
_glcpp_parser_expand_token_list_onto (parser, substituted, result);
_string_list_pop (parser->active);