34c5a1a313
the application programmer defines as expansion, e.g. to implement parameter substitution. While here add rudimentary documentation of the dynamic messages feature (so at least the parser and the syntax documented here are in sync). The man page could use some typesetting help...
199 lines
4.3 KiB
Plaintext
199 lines
4.3 KiB
Plaintext
/* $NetBSD: scan.l,v 1.17 2018/11/21 20:04:48 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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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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