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Better comment handling.

This commit is contained in:
steve 1999-07-10 00:36:12 +00:00
parent 32ad8607ac
commit 6003f42724
1 changed files with 23 additions and 2 deletions
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25
ivlpp/lexor.lex
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@ -19,7 +19,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#if !defined(WINNT)
#ident "$Id: lexor.lex,v 1.4 1999/07/07 01:18:57 steve Exp $"
#ident "$Id: lexor.lex,v 1.5 1999/07/10 00:36:12 steve Exp $"
#endif
# include <stdio.h>
@ -72,13 +72,25 @@ static struct include_stack_t*standby = 0;
} \
} while(0)
static int comment_enter = 0;
%}
%x PPINCLUDE
%x PPDEFINE
%x CCOMMENT
%%
/* detect multiline, c-style comments, passing them directly to the
output. This is necessary to allow for ignoring directives that
are included within the comments. */
"/*" { comment_enter = YY_START; BEGIN(CCOMMENT); ECHO; }
<CCOMMENT>. { ECHO; }
<CCOMMENT>\n { istack->lineno += 1; ECHO; }
<CCOMMENT>"*/" { BEGIN(comment_enter); ECHO; }
/* This set of patterns matches the include directive and the name
that follows it. when the directive ends, the do_include function
performs the include operation. */
@ -87,7 +99,7 @@ static struct include_stack_t*standby = 0;
<PPINCLUDE>\"[^\"]*\" { include_filename(); }
<PPINCLUDE>[ \t\b\f\r] { ; }
<PPINCLUDE>[ \t\b\f] { ; }
<PPINCLUDE>\n { istack->lineno += 1; BEGIN(0); do_include(); }
@ -103,6 +115,7 @@ static struct include_stack_t*standby = 0;
<PPDEFINE>\n { istack->lineno += 1; BEGIN(0); ECHO; }
/* This pattern notices macros and arranges for it to be replaced. */
`[a-zA-Z][a-zA-Z0-9_]* { def_match(); }
@ -148,6 +161,7 @@ static void def_match()
= calloc(1, sizeof(struct include_stack_t));
isp->str = cur->value;
isp->next = istack;
istack->yybs = YY_CURRENT_BUFFER;
istack = isp;
yy_switch_to_buffer(yy_new_buffer(istack->file, YY_BUF_SIZE));
@ -206,6 +220,13 @@ void define_macro(const char*name, const char*value)
static void do_define()
{
/* FIXME: This strips trailing line comments out of the
definition. It's not adequate as the "//" may have been
quoted or commented, but it'll do for now. */
char *cp;
if(cp = strstr(yytext, "//"))
*cp = 0;
define_macro(def_name, yytext);
}