a parser for config files and the command line
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Albert Cahalan
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2 changed files with 258 additions and 0 deletions
201
src/parse.gperf
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201
src/parse.gperf
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%struct-type
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%language=ANSI-C
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%7bit
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%readonly-tables
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%define initializer-suffix ,0
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%{
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#include "parse.h"
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#include <string.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <stdint.h>
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const char PARSE_YES[] = "yes";
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const char PARSE_NO[] = "no";
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struct cfg
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{
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const char *name;
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void (*val)(void);
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};
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#define MULTIVAL 0x00000000
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#define POS 0x00000001
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#define NEG 0x00000002
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#define BOOL (POS|NEG)
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#define BITS 2 // if this grows past 2, must shift the offset
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#define FLAGMASK ((1<<BITS)-1)
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#define MULTI(x) (void*)(offsetof(struct cfginfo,x)|MULTIVAL)
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#define POSBOOL(x) (void*)(offsetof(struct cfginfo,x)|POS|BOOL)
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#define NEGBOOL(x) (void*)(offsetof(struct cfginfo,x)|NEG|BOOL)
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#define IMM(x) imm_##x
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static void imm_version(void)
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{
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}
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static void imm_verbose_version(void)
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{
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}
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static void imm_usage(void)
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{
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}
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static void imm_help(void)
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{
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}
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static void imm_copying(void)
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{
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}
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%}
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struct cfg
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%%
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alllocalefonts, POSBOOL(all_locale_fonts)
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allowscreensaver, NEGBOOL(disable_screensaver)
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altprint, MULTI(alt_print_command_default)
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altprintalways, MULTI(alt_print_command_default)
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altprintcommand, MULTI(altprintcommand)
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altprintmod, MULTI(alt_print_command_default)
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altprintnever, MULTI(alt_print_command_default)
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autosave, POSBOOL(autosave_on_quit)
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buttondistinction, NEGBOOL(no_button_distinction)
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colorfile, MULTI(colorfile)
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complexshapes, NEGBOOL(simple_shapes)
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copying, IMM(copying)
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currentlocalefont, NEGBOOL(all_locale_fonts)
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datadir, MULTI(datadir)
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disablescreensaver, POSBOOL(disable_screensaver)
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dontgrab, NEGBOOL(grab_input)
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dontmirrorstamps, NEGBOOL(mirrorstamps)
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fancycursors, NEGBOOL(no_fancy_cursors)
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fullscreen, MULTI(parsertmp_fullscreen_native)
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grab, POSBOOL(grab_input)
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help, IMM(help)
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hidecursor, POSBOOL(hide_cursor)
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keyboard, POSBOOL(keymouse)
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label, NEGBOOL(disable_label)
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lang, MULTI(parsertmp_lang)
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locale, MULTI(parsertmp_locale)
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lockfile, POSBOOL(ok_to_use_lockfile)
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magiccontrols, NEGBOOL(disable_magic_controls)
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mirrorstamps, POSBOOL(mirrorstamps)
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mixedcase, NEGBOOL(only_uppercase)
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mouse, NEGBOOL(keymouse)
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native, POSBOOL(native_screensize)
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orient, MULTI(rotate_orientation)
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outlines, NEGBOOL(dont_do_xor)
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papersize, MULTI(papersize)
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print, NEGBOOL(disable_print)
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printcfg, POSBOOL(use_print_config)
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printcommand, MULTI(printcommand)
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printdelay, MULTI(print_delay)
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quit, NEGBOOL(disable_quit)
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save, NEGBOOL(disable_save)
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savedir, MULTI(savedir)
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saveover, MULTI(promptless_save)
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saveoverask, MULTI(promptless_save)
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saveovernew, MULTI(promptless_save)
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shortcuts, NEGBOOL(noshortcuts)
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showcursor, NEGBOOL(hide_cursor)
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simpleshapes, POSBOOL(simple_shapes)
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sound, POSBOOL(use_sound)
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stampcontrols, NEGBOOL(disable_stamp_controls)
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stamps, NEGBOOL(dont_load_stamps)
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stampsize, MULTI(stamp_size_override)
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startblank, POSBOOL(start_blank)
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startlast, NEGBOOL(start_blank)
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sysconfig, POSBOOL(parsertmp_sysconfig)
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sysfonts, NEGBOOL(no_system_fonts)
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uppercase, POSBOOL(only_uppercase)
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usage, IMM(usage)
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verbose-version, IMM(verbose_version)
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version, IMM(version)
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wheelmouse, POSBOOL(wheely)
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windowed, NEGBOOL(fullscreen)
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windowsize, MULTI(parsertmp_windowsize)
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%%
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void parse_one_option(struct cfginfo *restrict tmpcfg, const char *str, const char *opt, const char *restrict src)
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{
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//printf("parsing: <%s> <%s>\n",str,arg);
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if(isdigit(*str))
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{
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if(opt && !strcmp(opt,"no"))
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str = "640x480";
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opt = str;
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str = "windowsize";
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}
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int noflag = 2*(str[0]=='n' && str[1]=='o' && str[2]);
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const struct cfg *cfg = in_word_set(str+noflag, strlen(str+noflag));
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uintptr_t uintptr = cfg ? (uintptr_t)cfg->val : 0;
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unsigned flags = (uintptr<CFGINFO_MAXOFFSET) ? (uintptr & FLAGMASK) : 0;
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if(!cfg || (!(flags & BOOL) && noflag) )
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{
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if(src)
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printf("Unknown option '%s' in config file '%s'\n",str,src);
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else
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printf("Unknown command line option '--%s'\n",str);
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exit(47);
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}
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if(unlikely(uintptr >= CFGINFO_MAXOFFSET))
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{
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if(src)
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{
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// immediate options are only for the command line
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printf("Unknown option '%s' in config file '%s'\n",str,src);
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exit(49);
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}
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if(opt)
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{
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printf("Command line option '--%s' doesn't take a value.\n",str);
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exit(50);
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}
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cfg->val();
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exit(0);
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}
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if(flags & BOOL)
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{
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int flip = !!noflag ^ !!(flags & NEG);
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if(!opt)
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opt = flip ? PARSE_NO : PARSE_YES;
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else if(!strcmp("yes",opt))
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opt = flip ? PARSE_NO : PARSE_YES;
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else if(!strcmp("no",opt))
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opt = flip ? PARSE_YES : PARSE_NO;
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else
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{
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if(src)
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printf("Option '%s' in config file '%s' is yes/no only, but got '%s'\n",str,src,opt);
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else
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printf("Command line option '--%s' is yes/no only, but got '%s'\n",str,opt);
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exit(51);
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}
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}
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else if(!opt)
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{
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if(src)
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printf("Option '%s' in config file '%s' needs a value\n",str,src);
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else
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printf("Command line option '--%s' needs a value\n",str);
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exit(52);
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}
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unsigned offset = uintptr &~ FLAGMASK;
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memcpy(offset+(char*)tmpcfg, &opt, sizeof(char*));
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}
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57
src/parse.h
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57
src/parse.h
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@ -0,0 +1,57 @@
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#pragma once
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#include "compiler.h"
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extern const char PARSE_YES[];
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extern const char PARSE_NO[];
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struct cfginfo
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{
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const char *all_locale_fonts;
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const char *alt_print_command_default;
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const char *altprintcommand;
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const char *autosave_on_quit;
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const char *colorfile;
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const char *datadir;
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const char *disable_label;
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const char *disable_magic_controls;
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const char *disable_print;
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const char *disable_quit;
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const char *disable_save;
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const char *disable_screensaver;
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const char *disable_stamp_controls;
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const char *dont_do_xor;
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const char *dont_load_stamps;
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const char *fullscreen;
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const char *grab_input;
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const char *hide_cursor;
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const char *keymouse;
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const char *mirrorstamps;
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const char *native_screensize;
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const char *no_button_distinction;
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const char *no_fancy_cursors;
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const char *no_system_fonts;
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const char *noshortcuts;
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const char *ok_to_use_lockfile;
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const char *only_uppercase;
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const char *papersize;
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const char *parsertmp_fullscreen_native;
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const char *parsertmp_lang;
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const char *parsertmp_locale;
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const char *parsertmp_sysconfig;
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const char *parsertmp_windowsize;
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const char *print_delay;
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const char *printcommand;
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const char *promptless_save;
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const char *rotate_orientation;
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const char *savedir;
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const char *simple_shapes;
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const char *stamp_size_override;
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const char *start_blank;
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const char *use_print_config;
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const char *use_sound;
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const char *wheely;
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};
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#define CFGINFO_MAXOFFSET (sizeof(struct cfginfo))
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extern void parse_one_option(struct cfginfo *restrict tmpcfg, const char *str, const char *opt, const char *restrict src);
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