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* src/files.c, src/files.h (guard_obstack): Remove.

Browse Source 
* src/output.c (output): Adjust.
* src/reader.c (parse_braces): New, factoring...
(copy_action, copy_guard): these two which are renamed as...
(parse_action, parse_guard): these.
As a voluntary consequence, using braces around guards is now
mandatory.
This commit is contained in:
Akim Demaille
2001-12-27 18:06:24 +00:00
parent f499b06243
commit 14d293acb2
5 changed files with 69 additions and 131 deletions
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11
ChangeLog
View File

@@ -1,3 +1,14 @@
2001-12-27 Akim Demaille <akim@epita.fr>
* src/files.c, src/files.h (guard_obstack): Remove.
* src/output.c (output): Adjust.
* src/reader.c (parse_braces): New, factoring...
(copy_action, copy_guard): these two which are renamed as...
(parse_action, parse_guard): these.
As a voluntary consequence, using braces around guards is now
mandatory.
2001-12-27 Akim Demaille <akim@epita.fr>
* src/gram.h (rule_t): `guard' and `guard_line' are new members.

1
src/files.c
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@@ -30,7 +30,6 @@ FILE *finput = NULL;
struct obstack action_obstack;
struct obstack attrs_obstack;
struct obstack guard_obstack;
struct obstack output_obstack;
char *spec_outfile = NULL; /* for -o. */

3
src/files.h
View File

@@ -52,9 +52,6 @@ extern struct obstack action_obstack;
/* If semantic parser, output a .h file that defines YYSTYPE... */
extern struct obstack attrs_obstack;
/* ... and output yyguard, containing all the guard code. */
extern struct obstack guard_obstack;
/* The verbose output. */
extern struct obstack output_obstack;

1
src/output.c
View File

@@ -1128,6 +1128,5 @@ output (void)
obstack_free (&muscle_obstack, NULL);
obstack_free (&format_obstack, NULL);
obstack_free (&action_obstack, NULL);
obstack_free (&guard_obstack, NULL);
obstack_free (&attrs_obstack, NULL);
}

124
src/reader.c
View File

@@ -1080,10 +1080,14 @@ read_declarations (void)
| matching `}' into the actions file. STACK_OFFSET is the number of |
| values in the current rule so far, which says where to find `$0' |
| with respect to the top of the stack. |
| |
| This routine is used both for actions and guards. Only the |
| actions_obstack is used, but this is fine, since we use only |
| pointers to relevant portions inside this obstack. |
`-------------------------------------------------------------------*/
static void
copy_action (symbol_list *rule, int stack_offset)
parse_braces (symbol_list *rule, int stack_offset)
{
int c;
int count;
@@ -1093,14 +1097,9 @@ copy_action (symbol_list *rule, int stack_offset)
stack_offset = 0;
count = 1;
c = getc (finput);
rule->action_line = lineno;
while (count > 0)
{
while (c != '}')
{
while ((c = getc (finput)) != '}')
switch (c)
{
case '\n':
@@ -1139,11 +1138,7 @@ copy_action (symbol_list *rule, int stack_offset)
obstack_1grow (&action_obstack, c);
}
c = getc (finput);
}
/* above loop exits when c is '}' */
/* Above loop exits when C is '}'. */
if (--count)
{
obstack_1grow (&action_obstack, c);
@@ -1152,91 +1147,29 @@ copy_action (symbol_list *rule, int stack_offset)
}
obstack_1grow (&action_obstack, '\0');
rule->action = obstack_finish (&action_obstack);
}
/*-------------------------------------------------------------------.
| After `%guard' is seen in the input file, copy the actual guard |
| into the guards file. If the guard is followed by an action, copy |
| that into the actions file. STACK_OFFSET is the number of values |
| in the current rule so far, which says where to find `$0' with |
| respect to the top of the stack, for the simple parser in which |
| the stack is not popped until after the guard is run. |
`-------------------------------------------------------------------*/
static void
copy_guard (symbol_list *rule, int stack_offset)
parse_action (symbol_list *rule, int stack_offset)
{
int c;
int count;
int brace_flag = 0;
/* offset is always 0 if parser has already popped the stack pointer */
if (semantic_parser)
stack_offset = 0;
rule->guard_line = lineno;
count = 0;
c = getc (finput);
while (brace_flag ? (count > 0) : (c != ';'))
{
switch (c)
{
case '\n':
obstack_1grow (&guard_obstack, c);
lineno++;
break;
case '{':
obstack_1grow (&guard_obstack, c);
brace_flag = 1;
count++;
break;
case '}':
obstack_1grow (&guard_obstack, c);
if (count > 0)
count--;
else
{
complain (_("unmatched %s"), "`}'");
c = getc (finput); /* skip it */
}
break;
case '\'':
case '"':
copy_string (finput, &guard_obstack, c);
break;
case '/':
copy_comment (finput, &guard_obstack);
break;
case '$':
copy_dollar (finput, &guard_obstack, rule, stack_offset);
break;
case '@':
copy_at (finput, &guard_obstack, stack_offset);
break;
case EOF:
fatal ("%s", _("unterminated %guard clause"));
default:
obstack_1grow (&guard_obstack, c);
}
if (c != '}' || count != 0)
c = getc (finput);
}
obstack_1grow (&guard_obstack, '\0');
rule->guard = obstack_finish (&guard_obstack);
rule->action_line = lineno;
parse_braces (rule, stack_offset);
rule->action = obstack_finish (&action_obstack);
}
static void
parse_guard (symbol_list *rule, int stack_offset)
{
token_t t = lex ();
if (t != tok_left_curly)
complain (_("invalid %s declaration"), "%guard");
rule->guard_line = lineno;
parse_braces (rule, stack_offset);
rule->guard = obstack_finish (&action_obstack);
}
/*-------------------------------------------------------------------.
@@ -1439,7 +1372,7 @@ readgram (void)
}
else /* handle an action. */
{
copy_action (crule, rulelength);
parse_action (crule, rulelength);
action_flag = 1;
xactions++; /* JF */
}
@@ -1464,7 +1397,7 @@ readgram (void)
if (!semantic_parser)
complain (_("%%guard present but %%semantic_parser not specified"));
copy_guard (crule, rulelength);
parse_guard (crule, rulelength);
t = lex ();
}
@@ -1473,7 +1406,7 @@ readgram (void)
/* This case never occurs -wjh */
if (action_flag)
complain (_("two actions at end of one rule"));
copy_action (crule, rulelength);
parse_action (crule, rulelength);
action_flag = 1;
xactions++; /* -wjh */
t = lex ();
@@ -1865,7 +1798,6 @@ reader (void)
/* Initialize the obstacks. */
obstack_init (&action_obstack);
obstack_init (&attrs_obstack);
obstack_init (&guard_obstack);
obstack_init (&output_obstack);
finput = xfopen (infile, "r");