Mercurial > ~dholland > hg > ag > index.cgi
view helpgen/readhelp.syn @ 11:3aa0f5a02342
Remove unused variable; fix what it was supposed to be doing.
(and document it a bit for the next time through here)
author | David A. Holland |
---|---|
date | Tue, 31 May 2022 00:54:12 -0400 |
parents | 13d2b8934445 |
children |
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{ /* * AnaGram, a System for Syntax Directed Programming * Copyright 1993 Parsifal Software. All Rights Reserved. * Copyright 2006 David A. Holland. All Rights Reserved. * See the file COPYING for license and usage terms. * * readhelp.syn - Toplevel syntax for help source file. */ #include <sys/types.h> #include <sys/stat.h> #include <assert.h> #include <errno.h> #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include "utils.h" #include "topic.h" #include "helpgen.h" } [ pointer input pointer type = unsigned char * context type = unsigned char * default token type = void line numbers ] left = 169 right = 170 quote = '\'' range = 0..255 eof = 0 tab = '\t' nl = '\n' cr = '\r' blank = ' ' + tab text = ~eof & ~cr & ~nl (int) letter -> text & ~blank & ~',' & ~(left + right):c = c; (void) blanks -> blank -> blanks, blank (void) eol -> ["//", text...], cr?, nl (void) new line -> cr?, nl (void) continue -> blanks?, [eol, blanks?] (void) name -> letter:c = startstr(), addstr(c); -> name, letter:c = addstr(c); -> name, blanks, letter:c = addstr(' '), addstr(c); (const char *) title -> name, blanks? = getstr(); (void) titles -> title:t = topic_addtitle(curtopic, t); -> titles, ',', continue, title:t = topic_addtitle(curtopic, t); (long) text lines -> text unit..., new line = CONTEXT - inputdata; -> text lines, text unit..., new line (void) text unit // -> text - (left + right + quote) // -> quote, ~eof -> text - (left + right) -> cross reference (void) cross reference -> cross reference text, blanks?, right = see_xref(getstr()); (void) cross reference text -> left = startstr(); -> cross reference text, letter:c = addstr(c); -> cross reference text, blanks, letter:c = addstr(' '), addstr(c); -> cross reference text, blanks?, cr?, nl = addstr(' '); (long) block body -> text lines -> block body, blank lines, text lines (long) blank lines -> new line = CONTEXT - inputdata; -> blank lines, new line (long) end block -> blank lines, "##" -> "##" = CONTEXT - inputdata; (void) block -> !{ startblock(); }, titles, eol, real block body = endblock(); (void) real block body -> blank lines?, block body:bb, end block:be = block(bb,be); -> end block = block(0,0); (void) file $ -> blocks, eof (void) blocks -> -> blocks, blanks?, eol -> blocks, block //////////////////////////////////////////////////////////// // // string buffer { static char string_space[4096]; static size_t string_pos; static void startstr(void) { string_pos = 0; } static void addstr(int ch) { if (string_pos >= sizeof(string_space)-1) { fprintf(stderr, "String buffer overflow - make string_space larger\n"); exit(1); } string_space[string_pos++] = ch; } static const char *getstr(void) { string_space[string_pos] = 0; return string_space; } } //////////////////////////////////////////////////////////// // // current topic { static struct topic *curtopic; static void startblock(void) { assert(curtopic == NULL); curtopic = topic_create(); } static void endblock(void) { help_addtopic(curtopic); curtopic = NULL; } static void see_xref(const char *ref) { topic_addref(curtopic, ref); } } //////////////////////////////////////////////////////////// // // pointer input support { #define GET_CONTEXT CONTEXT = PCB.pointer static unsigned char *inputdata; static void block(long head, long tail) { long length = tail - head; assert(length >= 0); if (length > 0) { topic_setbody(curtopic, (const char *)(inputdata+head), length); } } static off_t getlength(int fd) { struct stat st; if (fstat(fd, &st) < 0) { fprintf(stderr, "fstat failed: %s", strerror(errno)); exit(1); } return st.st_size; } void load(const char *path) { char *buf; off_t len; int fd, r; fd = open(path, O_RDONLY); if (fd < 0) { fprintf(stderr, "%s: %s\n", path, strerror(errno)); exit(1); } len = getlength(fd); buf = domalloc(len+1); r = read(fd, buf, len); if (r < 0) { fprintf(stderr, "%s: read: %s\n", path, strerror(errno)); exit(1); } if (r < len) { fprintf(stderr, "%s: read: short count %d of %ld\n", path, r, (long) len); exit(1); } buf[r] = 0; close(fd); inputdata = (unsigned char *) buf; PCB.pointer = inputdata; readhelp(); inputdata = NULL; free(buf); } }