201 lines
4.3 KiB
Plaintext
201 lines
4.3 KiB
Plaintext
/* $NetBSD: scan.l,v 1.18 2019/02/25 20:47:37 martin Exp $ */
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/*
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* Copyright 1997 Piermont Information Systems Inc.
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* All rights reserved.
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*
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* Written by Philip A. Nelson for Piermont Information Systems Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of Piermont Information Systems Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY PIERMONT INFORMATION SYSTEMS INC. ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL PIERMONT INFORMATION SYSTEMS INC. BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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%{
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/* scan.l: scanner description for menu compiler. */
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#include <stdio.h>
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#include <string.h>
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#include "defs.h"
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#include "parse.h"
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static int level; /* For nested comments. */
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static int comstart; /* line number of comment start. */
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%}
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%x COMMENT
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%x BRACE
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%option noinput
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%%
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[ \t]+ { /* ignore spaces and tabs */ }
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[\n] { line_no++; }
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"="|";"|","|"("|")" { return (int)yytext[0]; }
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x { return X; }
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y { return Y; }
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w { return W; }
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h { return H; }
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no { return NO; }
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box { return BOX; }
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continuous { return CONTINUOUS; }
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sub { return SUB; }
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help { return HELP; }
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menu { return MENU; }
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menus { return MENUS; }
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next { return NEXT; }
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exit { return EXIT; }
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exitstring { return EXITSTRING; }
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title { return TITLE; }
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action { return ACTION; }
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endwin { return ENDWIN; }
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option { return OPTION; }
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default { return DEFAULT; }
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display { return DISPLAY; }
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expand { return EXPAND; }
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error { return ERROR; }
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allow { return ALLOW; }
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dynamic { return DYNAMIC; }
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messages { return MESSAGES; }
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scrollable { return SCROLLABLE; }
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shortcut { return SHORTCUT; }
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clear { return CLEAR; }
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always { return ALWAYS; }
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scroll { return SCROLL; }
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\"([^\"\n]*(\\\")?)*\" {
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yylval.s_value = strdup (yytext);
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max_strlen = max_strlen > strlen(yytext)
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? max_strlen : strlen(yytext) + 1;
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return STRING;
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}
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[a-zA-Z][a-zA-Z0-9_]* {
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yylval.s_value = strdup(yytext);
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return(NAME);
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}
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0|[-1-9][0-9]* {
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yylval.s_value = strdup(yytext);
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return(INT_CONST);
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}
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"'"[^'\\]|(\\[athrn])|(\\[0-9][0-9]?[0-9]?)"'" {
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yylval.s_value = strdup(yytext);
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return(CHAR_CONST);
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}
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"/*" { level = 1; comstart = line_no; BEGIN COMMENT; }
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<COMMENT>"/*" { level++; }
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<COMMENT>"*/" { if (level-- == 1) BEGIN 0; }
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<COMMENT>"\n" { line_no++; }
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<COMMENT><<EOF>> {
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yyerror ("EOF inside a comment that started at line %d",
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comstart);
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exit (1);
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}
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<COMMENT>. {/* eat character */}
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"{" { level = 1; BEGIN BRACE; }
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<BRACE>"{" { buff_add_ch(yytext[0]); level++; }
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<BRACE>"}" { if (level-- == 1) {
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BEGIN 0;
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yylval.s_value = buff_copy();
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return CODE;
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} else
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buff_add_ch (yytext[0]);
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}
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<BRACE>"\n" { buff_add_ch (yytext[0]); line_no++; }
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<BRACE>. { buff_add_ch (yytext[0]); }
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. {
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if (yytext[0] < ' ')
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yyerror ("illegal character: ^%c",yytext[0] + '@');
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else
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if (yytext[0] > '~')
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yyerror ("illegal character: \\%3d", (int) yytext[0]);
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else
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yyerror ("illegal character: %s",yytext);
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/* To quiet the compiler */
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if (0) unput(0);
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}
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%%
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#ifdef SCAN
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YYSTYPE yylval;
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main()
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{
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int val;
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line_no = 1;
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while ( (val = yylex()) != 0 )
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printf ("val = %d\n yytext = %s\n", val, yytext);
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}
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#endif
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