534 lines
12 KiB
Plaintext
534 lines
12 KiB
Plaintext
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/* 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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#ifndef lint
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static char rcsid[] =
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"@(#) $Header: /cvsroot/src/gnu/usr.bin/lex/Attic/scan.l,v 1.2 1993/05/04 07:45:11 cgd Exp $ (LBL)";
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#endif
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#undef yywrap
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#include "flexdef.h"
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#include "parse.h"
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#define ACTION_ECHO fprintf( temp_action_file, "%s", yytext )
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#define MARK_END_OF_PROLOG fprintf( temp_action_file, "%%%% end of prolog\n" );
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#undef YY_DECL
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#define YY_DECL \
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int flexscan()
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#define RETURNCHAR \
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yylval = yytext[0]; \
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return ( CHAR );
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#define RETURNNAME \
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(void) strcpy( nmstr, (char *) yytext ); \
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return ( NAME );
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#define PUT_BACK_STRING(str, start) \
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for ( i = strlen( (char *) (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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%x SECT2 SECT2PROLOG SECT3 CODEBLOCK PICKUPDEF SC CARETISBOL NUM QUOTE
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%x FIRSTCCL CCL ACTION RECOVER BRACEERROR C_COMMENT ACTION_COMMENT
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%x ACTION_STRING PERCENT_BRACE_ACTION USED_LIST CODEBLOCK_2 XLATION
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WS [ \t\f]+
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OPTWS [ \t\f]*
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NOT_WS [^ \t\f\n]
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NAME [a-z_][a-z_0-9-]*
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NOT_NAME [^a-z_\n]+
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SCNAME {NAME}
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ESCSEQ \\([^\n]|[0-9]{1,3}|x[0-9a-f]{1,2})
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%%
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static int bracelevel, didadef;
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int i, indented_code, checking_used, new_xlation;
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int doing_codeblock = false;
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Char nmdef[MAXLINE], myesc();
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^{WS} indented_code = true; BEGIN(CODEBLOCK);
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^#.*\n ++linenum; /* treat as a comment */
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^"/*" ECHO; BEGIN(C_COMMENT);
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^"%s"{NAME}? return ( SCDECL );
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^"%x"{NAME}? return ( XSCDECL );
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^"%{".*\n {
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++linenum;
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line_directive_out( stdout );
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indented_code = false;
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BEGIN(CODEBLOCK);
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}
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{WS} return ( WHITESPACE );
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^"%%".* {
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sectnum = 2;
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line_directive_out( stdout );
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BEGIN(SECT2PROLOG);
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return ( SECTEND );
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}
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^"%used" {
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pinpoint_message( "warning - %%used/%%unused have been deprecated" );
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checking_used = REALLY_USED; BEGIN(USED_LIST);
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}
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^"%unused" {
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checking_used = REALLY_NOT_USED; BEGIN(USED_LIST);
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pinpoint_message( "warning - %%used/%%unused have been deprecated" );
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checking_used = REALLY_NOT_USED; BEGIN(USED_LIST);
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}
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^"%"[aeknopt]{WS}.*\n {
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#ifdef NOTDEF
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fprintf( stderr,
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"old-style lex command at line %d ignored:\n\t%s",
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linenum, yytext );
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#endif
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++linenum;
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}
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^"%"[cr]{OPTWS} /* ignore old lex directive */
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%t{OPTWS}\n {
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++linenum;
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xlation =
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(int *) malloc( sizeof( int ) * (unsigned) csize );
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if ( ! xlation )
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flexfatal(
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"dynamic memory failure building %t table" );
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for ( i = 0; i < csize; ++i )
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xlation[i] = 0;
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num_xlations = 0;
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BEGIN(XLATION);
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}
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^"%"[^sxanpekotcru{}]{OPTWS} synerr( "unrecognized '%' directive" );
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^{NAME} {
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(void) strcpy( nmstr, (char *) 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}\n ++linenum; /* allows blank lines in section 1 */
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{OPTWS}\n ++linenum; return ( '\n' );
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. synerr( "illegal character" ); BEGIN(RECOVER);
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<C_COMMENT>"*/" ECHO; BEGIN(INITIAL);
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<C_COMMENT>"*/".*\n ++linenum; ECHO; BEGIN(INITIAL);
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<C_COMMENT>[^*\n]+ ECHO;
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<C_COMMENT>"*" ECHO;
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<C_COMMENT>\n ++linenum; ECHO;
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<CODEBLOCK>^"%}".*\n ++linenum; BEGIN(INITIAL);
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<CODEBLOCK>"reject" ECHO; CHECK_REJECT(yytext);
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<CODEBLOCK>"yymore" ECHO; CHECK_YYMORE(yytext);
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<CODEBLOCK>{NAME}|{NOT_NAME}|. ECHO;
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<CODEBLOCK>\n {
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++linenum;
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ECHO;
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if ( indented_code )
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BEGIN(INITIAL);
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}
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<PICKUPDEF>{WS} /* separates name and definition */
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<PICKUPDEF>{NOT_WS}.* {
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(void) strcpy( (char *) nmdef, (char *) yytext );
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for ( i = strlen( (char *) nmdef ) - 1;
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i >= 0 &&
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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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<PICKUPDEF>\n {
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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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<RECOVER>.*\n ++linenum; BEGIN(INITIAL); RETURNNAME;
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<USED_LIST>\n ++linenum; BEGIN(INITIAL);
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<USED_LIST>{WS}
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<USED_LIST>"reject" {
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if ( all_upper( yytext ) )
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reject_really_used = checking_used;
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else
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synerr( "unrecognized %used/%unused construct" );
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}
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<USED_LIST>"yymore" {
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if ( all_lower( yytext ) )
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yymore_really_used = checking_used;
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else
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synerr( "unrecognized %used/%unused construct" );
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}
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<USED_LIST>{NOT_WS}+ synerr( "unrecognized %used/%unused construct" );
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<XLATION>"%t"{OPTWS}\n ++linenum; BEGIN(INITIAL);
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<XLATION>^{OPTWS}[0-9]+ ++num_xlations; new_xlation = true;
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<XLATION>^. synerr( "bad row in translation table" );
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<XLATION>{WS} /* ignore whitespace */
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<XLATION>{ESCSEQ} {
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xlation[myesc( yytext )] =
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(new_xlation ? num_xlations : -num_xlations);
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new_xlation = false;
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}
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<XLATION>. {
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xlation[yytext[0]] =
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(new_xlation ? num_xlations : -num_xlations);
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new_xlation = false;
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}
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<XLATION>\n ++linenum;
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<SECT2PROLOG>.*\n/{NOT_WS} {
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++linenum;
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ACTION_ECHO;
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MARK_END_OF_PROLOG;
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BEGIN(SECT2);
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}
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<SECT2PROLOG>.*\n ++linenum; ACTION_ECHO;
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<SECT2PROLOG><<EOF>> MARK_END_OF_PROLOG; yyterminate();
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<SECT2>^{OPTWS}\n ++linenum; /* allow blank lines in section 2 */
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<SECT2>^({WS}|"%{") {
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indented_code = (yytext[0] != '%');
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doing_codeblock = true;
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bracelevel = 1;
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if ( indented_code )
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ACTION_ECHO;
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BEGIN(CODEBLOCK_2);
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}
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<SECT2>"<" BEGIN(SC); return ( '<' );
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<SECT2>^"^" return ( '^' );
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<SECT2>\" BEGIN(QUOTE); return ( '"' );
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<SECT2>"{"/[0-9] BEGIN(NUM); return ( '{' );
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<SECT2>"{"[^0-9\n][^}\n]* BEGIN(BRACEERROR);
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<SECT2>"$"/[ \t\n] return ( '$' );
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<SECT2>{WS}"%{" {
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bracelevel = 1;
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BEGIN(PERCENT_BRACE_ACTION);
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return ( '\n' );
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}
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<SECT2>{WS}"|".*\n continued_action = true; ++linenum; return ( '\n' );
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<SECT2>{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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return ( '\n' );
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}
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<SECT2>{OPTWS}/\n {
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bracelevel = 0;
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continued_action = false;
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BEGIN(ACTION);
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return ( '\n' );
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}
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<SECT2>^{OPTWS}\n ++linenum; return ( '\n' );
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<SECT2>"<<EOF>>" return ( EOF_OP );
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<SECT2>^"%%".* {
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sectnum = 3;
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BEGIN(SECT3);
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return ( EOF ); /* to stop the parser */
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}
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<SECT2>"["([^\\\]\n]|{ESCSEQ})+"]" {
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int cclval;
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(void) strcpy( nmstr, (char *) yytext );
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/* check to see if we've already encountered this ccl */
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if ( (cclval = ccllookup( (Char *) nmstr )) )
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{
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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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PUT_BACK_STRING((Char *) nmstr, 1);
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BEGIN(FIRSTCCL);
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return ( '[' );
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}
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}
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<SECT2>"{"{NAME}"}" {
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register Char *nmdefptr;
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Char *ndlookup();
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(void) strcpy( nmstr, (char *) yytext );
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nmstr[yyleng - 1] = '\0'; /* chop trailing brace */
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/* lookup from "nmstr + 1" to chop leading brace */
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if ( ! (nmdefptr = ndlookup( nmstr + 1 )) )
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synerr( "undefined {name}" );
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else
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{ /* push back name surrounded by ()'s */
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unput(')');
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PUT_BACK_STRING(nmdefptr, 0);
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unput('(');
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}
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}
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<SECT2>[/|*+?.()] return ( yytext[0] );
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<SECT2>. RETURNCHAR;
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<SECT2>\n ++linenum; return ( '\n' );
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<SC>"," return ( ',' );
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<SC>">" BEGIN(SECT2); return ( '>' );
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<SC>">"/"^" BEGIN(CARETISBOL); return ( '>' );
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<SC>{SCNAME} RETURNNAME;
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<SC>. synerr( "bad start condition name" );
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<CARETISBOL>"^" BEGIN(SECT2); return ( '^' );
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<QUOTE>[^"\n] RETURNCHAR;
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<QUOTE>\" BEGIN(SECT2); return ( '"' );
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<QUOTE>\n {
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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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<FIRSTCCL>"^"/[^-\n] BEGIN(CCL); return ( '^' );
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<FIRSTCCL>"^"/- return ( '^' );
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<FIRSTCCL>- BEGIN(CCL); yylval = '-'; return ( CHAR );
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<FIRSTCCL>. BEGIN(CCL); RETURNCHAR;
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<CCL>-/[^\]\n] return ( '-' );
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<CCL>[^\]\n] RETURNCHAR;
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<CCL>"]" BEGIN(SECT2); return ( ']' );
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<NUM>[0-9]+ {
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yylval = myctoi( yytext );
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return ( NUMBER );
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}
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<NUM>"," return ( ',' );
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<NUM>"}" BEGIN(SECT2); return ( '}' );
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<NUM>. {
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synerr( "bad character inside {}'s" );
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BEGIN(SECT2);
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return ( '}' );
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}
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<NUM>\n {
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synerr( "missing }" );
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BEGIN(SECT2);
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++linenum;
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return ( '}' );
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}
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<BRACEERROR>"}" synerr( "bad name in {}'s" ); BEGIN(SECT2);
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<BRACEERROR>\n synerr( "missing }" ); ++linenum; BEGIN(SECT2);
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<PERCENT_BRACE_ACTION,CODEBLOCK_2>{OPTWS}"%}".* bracelevel = 0;
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<PERCENT_BRACE_ACTION,CODEBLOCK_2,ACTION>"reject" {
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ACTION_ECHO;
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CHECK_REJECT(yytext);
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}
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<PERCENT_BRACE_ACTION,CODEBLOCK_2,ACTION>"yymore" {
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ACTION_ECHO;
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CHECK_YYMORE(yytext);
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}
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<PERCENT_BRACE_ACTION,CODEBLOCK_2>{NAME}|{NOT_NAME}|. ACTION_ECHO;
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<PERCENT_BRACE_ACTION,CODEBLOCK_2>\n {
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++linenum;
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ACTION_ECHO;
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if ( bracelevel == 0 ||
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(doing_codeblock && indented_code) )
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{
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if ( ! doing_codeblock )
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fputs( "\tYY_BREAK\n", temp_action_file );
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doing_codeblock = false;
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BEGIN(SECT2);
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}
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}
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/* Reject and YYmore() are checked for above, in PERCENT_BRACE_ACTION */
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<ACTION>"{" ACTION_ECHO; ++bracelevel;
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<ACTION>"}" ACTION_ECHO; --bracelevel;
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<ACTION>[^a-z_{}"'/\n]+ ACTION_ECHO;
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<ACTION>{NAME} ACTION_ECHO;
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<ACTION>"/*" ACTION_ECHO; BEGIN(ACTION_COMMENT);
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<ACTION>"'"([^'\\\n]|\\.)*"'" ACTION_ECHO; /* character constant */
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<ACTION>\" ACTION_ECHO; BEGIN(ACTION_STRING);
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<ACTION>\n {
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++linenum;
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ACTION_ECHO;
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if ( bracelevel == 0 )
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{
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fputs( "\tYY_BREAK\n", temp_action_file );
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BEGIN(SECT2);
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}
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}
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<ACTION>. ACTION_ECHO;
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<ACTION_COMMENT>"*/" ACTION_ECHO; BEGIN(ACTION);
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<ACTION_COMMENT>[^*\n]+ ACTION_ECHO;
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<ACTION_COMMENT>"*" ACTION_ECHO;
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<ACTION_COMMENT>\n ++linenum; ACTION_ECHO;
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<ACTION_COMMENT>. ACTION_ECHO;
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<ACTION_STRING>[^"\\\n]+ ACTION_ECHO;
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<ACTION_STRING>\\. ACTION_ECHO;
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<ACTION_STRING>\n ++linenum; ACTION_ECHO;
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<ACTION_STRING>\" ACTION_ECHO; BEGIN(ACTION);
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<ACTION_STRING>. ACTION_ECHO;
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<ACTION,ACTION_COMMENT,ACTION_STRING><<EOF>> {
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synerr( "EOF encountered inside an action" );
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yyterminate();
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}
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<SECT2,QUOTE,CCL>{ESCSEQ} {
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yylval = myesc( yytext );
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return ( CHAR );
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}
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<FIRSTCCL>{ESCSEQ} {
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yylval = myesc( yytext );
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BEGIN(CCL);
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return ( CHAR );
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}
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<SECT3>.*(\n?) ECHO;
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%%
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int yywrap()
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{
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if ( --num_input_files > 0 )
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{
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set_input_file( *++input_files );
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return ( 0 );
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}
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else
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return ( 1 );
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}
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/* set_input_file - open the given file (if NULL, stdin) for scanning */
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void set_input_file( file )
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char *file;
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{
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if ( file )
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{
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infilename = file;
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yyin = fopen( infilename, "r" );
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if ( yyin == NULL )
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lerrsf( "can't open %s", file );
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}
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else
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{
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yyin = stdin;
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infilename = "<stdin>";
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}
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}
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