5dd0d3701b
Inspired by: NetBSD/OpenBSD (I can't remember who I saw do it
first, so I'll give them both some inspiration
points. :)
711 lines
15 KiB
Plaintext
711 lines
15 KiB
Plaintext
/* scan.l - scanner for flex input */
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%{
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Vern Paxson.
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*
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* The United States Government has rights in this work pursuant
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* to contract no. DE-AC03-76SF00098 between the United States
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* Department of Energy and the University of California.
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*
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* Redistribution and use in source and binary forms are permitted provided
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* that: (1) source distributions retain this entire copyright notice and
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* comment, and (2) distributions including binaries display the following
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* acknowledgement: ``This product includes software developed by the
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* University of California, Berkeley and its contributors'' in the
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* documentation or other materials provided with the distribution and in
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* all advertising materials mentioning features or use of this software.
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* Neither the name of the University nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* $Header: /home/ncvs/src/usr.bin/lex/scan.l,v 1.2 1996/06/19 22:25:32 nate Exp $ */
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#include "flexdef.h"
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#include "parse.h"
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#define ACTION_ECHO add_action( yytext )
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#define ACTION_IFDEF(def, should_define) \
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{ \
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if ( should_define ) \
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action_define( def, 1 ); \
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}
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#define MARK_END_OF_PROLOG mark_prolog();
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#define YY_DECL \
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int flexscan()
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#define RETURNCHAR \
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yylval = (unsigned char) yytext[0]; \
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return CHAR;
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#define RETURNNAME \
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strcpy( nmstr, yytext ); \
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return NAME;
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#define PUT_BACK_STRING(str, start) \
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for ( i = strlen( str ) - 1; i >= start; --i ) \
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unput((str)[i])
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#define CHECK_REJECT(str) \
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if ( all_upper( str ) ) \
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reject = true;
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#define CHECK_YYMORE(str) \
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if ( all_lower( str ) ) \
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yymore_used = true;
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%}
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%option caseless nodefault outfile="scan.c" stack noyy_top_state
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%option nostdinit
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%x SECT2 SECT2PROLOG SECT3 CODEBLOCK PICKUPDEF SC CARETISBOL NUM QUOTE
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%x FIRSTCCL CCL ACTION RECOVER COMMENT ACTION_STRING PERCENT_BRACE_ACTION
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%x OPTION LINEDIR
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WS [[:blank:]]+
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OPTWS [[:blank:]]*
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NOT_WS [^[:blank:]\n]
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NL \r?\n
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NAME ([[:alpha:]_][[:alnum:]_-]*)
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NOT_NAME [^[:alpha:]_*\n]+
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SCNAME {NAME}
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ESCSEQ (\\([^\n]|[0-7]{1,3}|x[[:xdigit:]]{1,2}))
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FIRST_CCL_CHAR ([^\\\n]|{ESCSEQ})
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CCL_CHAR ([^\\\n\]]|{ESCSEQ})
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CCL_EXPR ("[:"[[:alpha:]]+":]")
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LEXOPT [aceknopr]
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%%
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static int bracelevel, didadef, indented_code;
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static int doing_rule_action = false;
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static int option_sense;
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int doing_codeblock = false;
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int i;
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Char nmdef[MAXLINE], myesc();
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<INITIAL>{
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^{WS} indented_code = true; BEGIN(CODEBLOCK);
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^"/*" ACTION_ECHO; yy_push_state( COMMENT );
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^#{OPTWS}line{WS} yy_push_state( LINEDIR );
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^"%s"{NAME}? return SCDECL;
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^"%x"{NAME}? return XSCDECL;
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^"%{".*{NL} {
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++linenum;
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line_directive_out( (FILE *) 0, 1 );
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indented_code = false;
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BEGIN(CODEBLOCK);
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}
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{WS} /* discard */
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^"%%".* {
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sectnum = 2;
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bracelevel = 0;
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mark_defs1();
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line_directive_out( (FILE *) 0, 1 );
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BEGIN(SECT2PROLOG);
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return SECTEND;
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}
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^"%pointer".*{NL} yytext_is_array = false; ++linenum;
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^"%array".*{NL} yytext_is_array = true; ++linenum;
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^"%option" BEGIN(OPTION); return OPTION_OP;
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^"%"{LEXOPT}{OPTWS}[[:digit:]]*{OPTWS}{NL} ++linenum; /* ignore */
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^"%"{LEXOPT}{WS}.*{NL} ++linenum; /* ignore */
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^"%"[^sxaceknopr{}].* synerr( _( "unrecognized '%' directive" ) );
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^{NAME} {
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strcpy( nmstr, yytext );
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didadef = false;
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BEGIN(PICKUPDEF);
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}
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{SCNAME} RETURNNAME;
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^{OPTWS}{NL} ++linenum; /* allows blank lines in section 1 */
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{OPTWS}{NL} ACTION_ECHO; ++linenum; /* maybe end of comment line */
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}
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<COMMENT>{
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"*/" ACTION_ECHO; yy_pop_state();
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"*" ACTION_ECHO;
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[^*\n]+ ACTION_ECHO;
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[^*\n]*{NL} ++linenum; ACTION_ECHO;
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}
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<LINEDIR>{
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\n yy_pop_state();
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[[:digit:]]+ linenum = myctoi( yytext );
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\"[^"\n]*\" {
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flex_free( (void *) infilename );
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infilename = copy_string( yytext + 1 );
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infilename[strlen( infilename ) - 1] = '\0';
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}
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. /* ignore spurious characters */
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}
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<CODEBLOCK>{
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^"%}".*{NL} ++linenum; BEGIN(INITIAL);
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{NAME}|{NOT_NAME}|. ACTION_ECHO;
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{NL} {
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++linenum;
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ACTION_ECHO;
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if ( indented_code )
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BEGIN(INITIAL);
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}
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}
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<PICKUPDEF>{
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{WS} /* separates name and definition */
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{NOT_WS}.* {
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strcpy( (char *) nmdef, yytext );
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/* Skip trailing whitespace. */
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for ( i = strlen( (char *) nmdef ) - 1;
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i >= 0 && (nmdef[i] == ' ' || nmdef[i] == '\t');
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--i )
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;
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nmdef[i + 1] = '\0';
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ndinstal( nmstr, nmdef );
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didadef = true;
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}
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{NL} {
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if ( ! didadef )
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synerr( _( "incomplete name definition" ) );
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BEGIN(INITIAL);
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++linenum;
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}
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}
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<OPTION>{
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{NL} ++linenum; BEGIN(INITIAL);
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{WS} option_sense = true;
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"=" return '=';
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no option_sense = ! option_sense;
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7bit csize = option_sense ? 128 : 256;
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8bit csize = option_sense ? 256 : 128;
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align long_align = option_sense;
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always-interactive {
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action_define( "YY_ALWAYS_INTERACTIVE", option_sense );
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}
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array yytext_is_array = option_sense;
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backup backing_up_report = option_sense;
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batch interactive = ! option_sense;
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"c++" C_plus_plus = option_sense;
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caseful|case-sensitive caseins = ! option_sense;
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caseless|case-insensitive caseins = option_sense;
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debug ddebug = option_sense;
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default spprdflt = ! option_sense;
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ecs useecs = option_sense;
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fast {
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useecs = usemecs = false;
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use_read = fullspd = true;
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}
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full {
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useecs = usemecs = false;
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use_read = fulltbl = true;
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}
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input ACTION_IFDEF("YY_NO_INPUT", ! option_sense);
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interactive interactive = option_sense;
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lex-compat lex_compat = option_sense;
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main {
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action_define( "YY_MAIN", option_sense );
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do_yywrap = ! option_sense;
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}
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meta-ecs usemecs = option_sense;
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never-interactive {
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action_define( "YY_NEVER_INTERACTIVE", option_sense );
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}
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perf-report performance_report += option_sense ? 1 : -1;
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pointer yytext_is_array = ! option_sense;
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read use_read = option_sense;
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reject reject_really_used = option_sense;
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stack action_define( "YY_STACK_USED", option_sense );
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stdinit do_stdinit = option_sense;
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stdout use_stdout = option_sense;
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unput ACTION_IFDEF("YY_NO_UNPUT", ! option_sense);
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verbose printstats = option_sense;
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warn nowarn = ! option_sense;
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yylineno do_yylineno = option_sense;
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yymore yymore_really_used = option_sense;
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yywrap do_yywrap = option_sense;
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yy_push_state ACTION_IFDEF("YY_NO_PUSH_STATE", ! option_sense);
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yy_pop_state ACTION_IFDEF("YY_NO_POP_STATE", ! option_sense);
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yy_top_state ACTION_IFDEF("YY_NO_TOP_STATE", ! option_sense);
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yy_scan_buffer ACTION_IFDEF("YY_NO_SCAN_BUFFER", ! option_sense);
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yy_scan_bytes ACTION_IFDEF("YY_NO_SCAN_BYTES", ! option_sense);
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yy_scan_string ACTION_IFDEF("YY_NO_SCAN_STRING", ! option_sense);
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outfile return OPT_OUTFILE;
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prefix return OPT_PREFIX;
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yyclass return OPT_YYCLASS;
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\"[^"\n]*\" {
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strcpy( nmstr, yytext + 1 );
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nmstr[strlen( nmstr ) - 1] = '\0';
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return NAME;
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}
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(([a-mo-z]|n[a-np-z])[[:alpha:]\-+]*)|. {
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format_synerr( _( "unrecognized %%option: %s" ),
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yytext );
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BEGIN(RECOVER);
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}
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}
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<RECOVER>.*{NL} ++linenum; BEGIN(INITIAL);
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<SECT2PROLOG>{
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^"%{".* ++bracelevel; yyless( 2 ); /* eat only %{ */
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^"%}".* --bracelevel; yyless( 2 ); /* eat only %} */
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^{WS}.* ACTION_ECHO; /* indented code in prolog */
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^{NOT_WS}.* { /* non-indented code */
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if ( bracelevel <= 0 )
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{ /* not in %{ ... %} */
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yyless( 0 ); /* put it all back */
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yy_set_bol( 1 );
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mark_prolog();
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BEGIN(SECT2);
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}
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else
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ACTION_ECHO;
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}
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.* ACTION_ECHO;
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{NL} ++linenum; ACTION_ECHO;
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<<EOF>> {
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mark_prolog();
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sectnum = 0;
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yyterminate(); /* to stop the parser */
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}
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}
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<SECT2>{
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^{OPTWS}{NL} ++linenum; /* allow blank lines in section 2 */
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^{OPTWS}"%{" {
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indented_code = false;
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doing_codeblock = true;
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bracelevel = 1;
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BEGIN(PERCENT_BRACE_ACTION);
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}
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^{OPTWS}"<" BEGIN(SC); return '<';
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^{OPTWS}"^" return '^';
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\" BEGIN(QUOTE); return '"';
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"{"/[[:digit:]] BEGIN(NUM); return '{';
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"$"/([[:blank:]]|{NL}) return '$';
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{WS}"%{" {
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bracelevel = 1;
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BEGIN(PERCENT_BRACE_ACTION);
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if ( in_rule )
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{
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doing_rule_action = true;
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in_rule = false;
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return '\n';
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}
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}
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{WS}"|".*{NL} continued_action = true; ++linenum; return '\n';
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^{WS}"/*" {
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yyless( yyleng - 2 ); /* put back '/', '*' */
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bracelevel = 0;
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continued_action = false;
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BEGIN(ACTION);
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}
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^{WS} /* allow indented rules */
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{WS} {
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/* This rule is separate from the one below because
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* otherwise we get variable trailing context, so
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* we can't build the scanner using -{f,F}.
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*/
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bracelevel = 0;
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continued_action = false;
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BEGIN(ACTION);
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if ( in_rule )
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{
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doing_rule_action = true;
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in_rule = false;
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return '\n';
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}
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}
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{OPTWS}{NL} {
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bracelevel = 0;
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continued_action = false;
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BEGIN(ACTION);
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unput( '\n' ); /* so <ACTION> sees it */
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if ( in_rule )
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{
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doing_rule_action = true;
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in_rule = false;
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return '\n';
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}
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}
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^{OPTWS}"<<EOF>>" |
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"<<EOF>>" return EOF_OP;
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^"%%".* {
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sectnum = 3;
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BEGIN(SECT3);
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yyterminate(); /* to stop the parser */
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}
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"["({FIRST_CCL_CHAR}|{CCL_EXPR})({CCL_CHAR}|{CCL_EXPR})* {
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int cclval;
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strcpy( nmstr, yytext );
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/* Check to see if we've already encountered this
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* ccl.
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*/
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if ( (cclval = ccllookup( (Char *) nmstr )) != 0 )
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{
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if ( input() != ']' )
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synerr( _( "bad character class" ) );
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yylval = cclval;
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++cclreuse;
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return PREVCCL;
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}
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else
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{
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/* We fudge a bit. We know that this ccl will
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* soon be numbered as lastccl + 1 by cclinit.
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*/
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cclinstal( (Char *) nmstr, lastccl + 1 );
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/* Push back everything but the leading bracket
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* so the ccl can be rescanned.
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*/
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yyless( 1 );
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BEGIN(FIRSTCCL);
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return '[';
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}
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}
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"{"{NAME}"}" {
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register Char *nmdefptr;
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Char *ndlookup();
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strcpy( nmstr, yytext + 1 );
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nmstr[yyleng - 2] = '\0'; /* chop trailing brace */
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if ( (nmdefptr = ndlookup( nmstr )) == 0 )
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format_synerr(
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_( "undefined definition {%s}" ),
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nmstr );
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else
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{ /* push back name surrounded by ()'s */
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int len = strlen( (char *) nmdefptr );
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if ( lex_compat || nmdefptr[0] == '^' ||
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(len > 0 && nmdefptr[len - 1] == '$') )
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{ /* don't use ()'s after all */
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PUT_BACK_STRING((char *) nmdefptr, 0);
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if ( nmdefptr[0] == '^' )
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BEGIN(CARETISBOL);
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}
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else
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{
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unput(')');
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PUT_BACK_STRING((char *) nmdefptr, 0);
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unput('(');
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}
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}
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}
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[/|*+?.(){}] return (unsigned char) yytext[0];
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. RETURNCHAR;
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}
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<SC>{
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[,*] return (unsigned char) yytext[0];
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">" BEGIN(SECT2); return '>';
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">"/^ BEGIN(CARETISBOL); return '>';
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{SCNAME} RETURNNAME;
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. {
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format_synerr( _( "bad <start condition>: %s" ),
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yytext );
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}
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}
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<CARETISBOL>"^" BEGIN(SECT2); return '^';
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<QUOTE>{
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[^"\n] RETURNCHAR;
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\" BEGIN(SECT2); return '"';
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{NL} {
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synerr( _( "missing quote" ) );
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BEGIN(SECT2);
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++linenum;
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return '"';
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}
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}
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<FIRSTCCL>{
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"^"/[^-\]\n] BEGIN(CCL); return '^';
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"^"/("-"|"]") return '^';
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. BEGIN(CCL); RETURNCHAR;
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}
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<CCL>{
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-/[^\]\n] return '-';
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[^\]\n] RETURNCHAR;
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"]" BEGIN(SECT2); return ']';
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.|{NL} {
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synerr( _( "bad character class" ) );
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BEGIN(SECT2);
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return ']';
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}
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}
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<FIRSTCCL,CCL>{
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"[:alnum:]" BEGIN(CCL); return CCE_ALNUM;
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"[:alpha:]" BEGIN(CCL); return CCE_ALPHA;
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"[:blank:]" BEGIN(CCL); return CCE_BLANK;
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"[:cntrl:]" BEGIN(CCL); return CCE_CNTRL;
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"[:digit:]" BEGIN(CCL); return CCE_DIGIT;
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"[:graph:]" BEGIN(CCL); return CCE_GRAPH;
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"[:lower:]" BEGIN(CCL); return CCE_LOWER;
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"[:print:]" BEGIN(CCL); return CCE_PRINT;
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"[:punct:]" BEGIN(CCL); return CCE_PUNCT;
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"[:space:]" BEGIN(CCL); return CCE_SPACE;
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"[:upper:]" BEGIN(CCL); return CCE_UPPER;
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"[:xdigit:]" BEGIN(CCL); return CCE_XDIGIT;
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{CCL_EXPR} {
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format_synerr(
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_( "bad character class expression: %s" ),
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yytext );
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BEGIN(CCL); return CCE_ALNUM;
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}
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}
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<NUM>{
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[[:digit:]]+ {
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yylval = myctoi( yytext );
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return NUMBER;
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}
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"," return ',';
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|
"}" BEGIN(SECT2); return '}';
|
|
|
|
. {
|
|
synerr( _( "bad character inside {}'s" ) );
|
|
BEGIN(SECT2);
|
|
return '}';
|
|
}
|
|
|
|
{NL} {
|
|
synerr( _( "missing }" ) );
|
|
BEGIN(SECT2);
|
|
++linenum;
|
|
return '}';
|
|
}
|
|
}
|
|
|
|
|
|
<PERCENT_BRACE_ACTION>{
|
|
{OPTWS}"%}".* bracelevel = 0;
|
|
|
|
<ACTION>"/*" ACTION_ECHO; yy_push_state( COMMENT );
|
|
|
|
<CODEBLOCK,ACTION>{
|
|
"reject" {
|
|
ACTION_ECHO;
|
|
CHECK_REJECT(yytext);
|
|
}
|
|
"yymore" {
|
|
ACTION_ECHO;
|
|
CHECK_YYMORE(yytext);
|
|
}
|
|
}
|
|
|
|
{NAME}|{NOT_NAME}|. ACTION_ECHO;
|
|
{NL} {
|
|
++linenum;
|
|
ACTION_ECHO;
|
|
if ( bracelevel == 0 ||
|
|
(doing_codeblock && indented_code) )
|
|
{
|
|
if ( doing_rule_action )
|
|
add_action( "\tYY_BREAK\n" );
|
|
|
|
doing_rule_action = doing_codeblock = false;
|
|
BEGIN(SECT2);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* Reject and YYmore() are checked for above, in PERCENT_BRACE_ACTION */
|
|
<ACTION>{
|
|
"{" ACTION_ECHO; ++bracelevel;
|
|
"}" ACTION_ECHO; --bracelevel;
|
|
[^[:alpha:]_{}"'/\n]+ ACTION_ECHO;
|
|
{NAME} ACTION_ECHO;
|
|
"'"([^'\\\n]|\\.)*"'" ACTION_ECHO; /* character constant */
|
|
\" ACTION_ECHO; BEGIN(ACTION_STRING);
|
|
{NL} {
|
|
++linenum;
|
|
ACTION_ECHO;
|
|
if ( bracelevel == 0 )
|
|
{
|
|
if ( doing_rule_action )
|
|
add_action( "\tYY_BREAK\n" );
|
|
|
|
doing_rule_action = false;
|
|
BEGIN(SECT2);
|
|
}
|
|
}
|
|
. ACTION_ECHO;
|
|
}
|
|
|
|
<ACTION_STRING>{
|
|
[^"\\\n]+ ACTION_ECHO;
|
|
\\. ACTION_ECHO;
|
|
{NL} ++linenum; ACTION_ECHO;
|
|
\" ACTION_ECHO; BEGIN(ACTION);
|
|
. ACTION_ECHO;
|
|
}
|
|
|
|
<COMMENT,ACTION,ACTION_STRING><<EOF>> {
|
|
synerr( _( "EOF encountered inside an action" ) );
|
|
yyterminate();
|
|
}
|
|
|
|
|
|
<SECT2,QUOTE,FIRSTCCL,CCL>{ESCSEQ} {
|
|
yylval = myesc( (Char *) yytext );
|
|
|
|
if ( YY_START == FIRSTCCL )
|
|
BEGIN(CCL);
|
|
|
|
return CHAR;
|
|
}
|
|
|
|
|
|
<SECT3>{
|
|
.*(\n?) ECHO;
|
|
<<EOF>> sectnum = 0; yyterminate();
|
|
}
|
|
|
|
<*>.|\n format_synerr( _( "bad character: %s" ), yytext );
|
|
|
|
%%
|
|
|
|
|
|
int yywrap()
|
|
{
|
|
if ( --num_input_files > 0 )
|
|
{
|
|
set_input_file( *++input_files );
|
|
return 0;
|
|
}
|
|
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
|
|
/* set_input_file - open the given file (if NULL, stdin) for scanning */
|
|
|
|
void set_input_file( file )
|
|
char *file;
|
|
{
|
|
if ( file && strcmp( file, "-" ) )
|
|
{
|
|
infilename = copy_string( file );
|
|
yyin = fopen( infilename, "r" );
|
|
|
|
if ( yyin == NULL )
|
|
lerrsf( _( "can't open %s" ), file );
|
|
}
|
|
|
|
else
|
|
{
|
|
yyin = stdin;
|
|
infilename = copy_string( "<stdin>" );
|
|
}
|
|
|
|
linenum = 1;
|
|
}
|
|
|
|
|
|
/* Wrapper routines for accessing the scanner's malloc routines. */
|
|
|
|
void *flex_alloc( size )
|
|
size_t size;
|
|
{
|
|
return (void *) malloc( size );
|
|
}
|
|
|
|
void *flex_realloc( ptr, size )
|
|
void *ptr;
|
|
size_t size;
|
|
{
|
|
return (void *) realloc( ptr, size );
|
|
}
|
|
|
|
void flex_free( ptr )
|
|
void *ptr;
|
|
{
|
|
if ( ptr )
|
|
free( ptr );
|
|
}
|