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573 lines
12 KiB
Plaintext
573 lines
12 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: scan.l,v 1.2 94/01/04 14:33:09 vern 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 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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%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
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WS [ \t]+
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OPTWS [ \t]*
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NOT_WS [^ \t\n]
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NL (\n|\r\n|\n\r)
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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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FIRST_CCL_CHAR ([^\\\n]|{ESCSEQ})
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CCL_CHAR ([^\\\n\]]|{ESCSEQ})
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%%
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static int bracelevel, didadef, indented_code, checking_used;
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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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^{WS} indented_code = true; BEGIN(CODEBLOCK);
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^"/*" ACTION_ECHO; BEGIN(C_COMMENT);
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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 );
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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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bracelevel = 0;
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mark_defs1();
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line_directive_out( (FILE *) 0 );
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BEGIN(SECT2PROLOG);
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return SECTEND;
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}
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^"%pointer".*{NL} {
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if ( lex_compat )
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warn( "%pointer incompatible with -l option" );
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else
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yytext_is_array = false;
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++linenum;
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}
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^"%array".*{NL} {
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if ( C_plus_plus )
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warn( "%array incompatible with -+ option" );
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else
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yytext_is_array = true;
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++linenum;
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}
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^"%used" {
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warn( "%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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warn( "%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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^"%"[aceknopr]{OPTWS}[0-9]*{OPTWS}{NL} ++linenum; /* ignore */
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^"%"[^sxanpekotcru{}].* 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} ++linenum; return '\n';
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<C_COMMENT>"*/" ACTION_ECHO; BEGIN(INITIAL);
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<C_COMMENT>"*/".*{NL} ++linenum; ACTION_ECHO; BEGIN(INITIAL);
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<C_COMMENT>[^*\n]+ ACTION_ECHO;
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<C_COMMENT>"*" ACTION_ECHO;
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<C_COMMENT>{NL} ++linenum; ACTION_ECHO;
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<CODEBLOCK>^"%}".*{NL} ++linenum; BEGIN(INITIAL);
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<CODEBLOCK>"reject" ACTION_ECHO; CHECK_REJECT(yytext);
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<CODEBLOCK>"yymore" ACTION_ECHO; CHECK_YYMORE(yytext);
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<CODEBLOCK>{NAME}|{NOT_NAME}|. ACTION_ECHO;
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<CODEBLOCK>{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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<PICKUPDEF>{WS} /* separates name and definition */
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<PICKUPDEF>{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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<PICKUPDEF>{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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<RECOVER>.*{NL} ++linenum; BEGIN(INITIAL); RETURNNAME;
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<USED_LIST>{NL} ++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(
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"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(
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"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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<SECT2PROLOG>^"%{".* ++bracelevel; yyless( 2 ); /* eat only %{ */
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<SECT2PROLOG>^"%}".* --bracelevel; yyless( 2 ); /* eat only %} */
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<SECT2PROLOG>^{WS}.* ACTION_ECHO; /* indented code in prolog */
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<SECT2PROLOG>^{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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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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<SECT2PROLOG>.* ACTION_ECHO;
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<SECT2PROLOG>{NL} ++linenum; ACTION_ECHO;
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<SECT2PROLOG><<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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<SECT2>^{OPTWS}{NL} ++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>"$"/([ \t]|{NL}) return '$';
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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}"|".*{NL} 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}{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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return '\n';
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}
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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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yyterminate(); /* to stop the parser */
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}
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<SECT2>"["{FIRST_CCL_CHAR}{CCL_CHAR}* {
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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 )) )
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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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<SECT2>"{"{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 )) )
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format_synerr( "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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<SECT2>[/|*+?.()] return (unsigned char) yytext[0];
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<SECT2>. RETURNCHAR;
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<SC>[,*] return (unsigned char) yytext[0];
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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>. {
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format_synerr( "bad <start condition>: %s", yytext );
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}
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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>{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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<FIRSTCCL>"^"/[^-\]\n] BEGIN(CCL); return '^';
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<FIRSTCCL>"^"/("-"|"]") return '^';
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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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<CCL>.|{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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<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>{NL} {
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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>{NL} synerr( "missing }" ); ++linenum; BEGIN(SECT2);
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<CODEBLOCK_2>"/*" ACTION_ECHO; BEGIN(ACTION_COMMENT);
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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>{NL} {
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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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add_action( "\tYY_BREAK\n" );
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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>{NL} {
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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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add_action( "\tYY_BREAK\n" );
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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>"*/" {
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ACTION_ECHO;
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if ( doing_codeblock )
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BEGIN(CODEBLOCK_2);
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else
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BEGIN(ACTION);
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}
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<ACTION_COMMENT>"*" ACTION_ECHO;
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<ACTION_COMMENT>[^*\n]+ ACTION_ECHO;
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<ACTION_COMMENT>[^*\n]*{NL} ++linenum; 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>{NL} ++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( (Char *) yytext );
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return CHAR;
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}
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<FIRSTCCL>{ESCSEQ} {
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yylval = myesc( (Char *) 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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<SECT3><<EOF>> sectnum = 0; yyterminate();
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<*>.|\n format_synerr( "bad character: %s", yytext );
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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;
|
|
infilename = "<stdin>";
|
|
}
|
|
}
|
|
|
|
|
|
/* Wrapper routines for accessing the scanner's malloc routines. */
|
|
|
|
void *flex_alloc( size )
|
|
unsigned int size;
|
|
{
|
|
return yy_flex_alloc( size );
|
|
}
|
|
|
|
void *flex_realloc( ptr, size )
|
|
void *ptr;
|
|
unsigned int size;
|
|
{
|
|
return yy_flex_realloc( ptr, size );
|
|
}
|
|
|
|
void flex_free( ptr )
|
|
void *ptr;
|
|
{
|
|
yy_flex_free( ptr );
|
|
}
|