402 lines
8.9 KiB
C
402 lines
8.9 KiB
C
/* cmarkdown
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* Copyright (C) <2007> Enno boland <g s01 de>
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*
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* See LICENSE for further informations
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#define BUFFERSIZE 1024
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#define ERRMALLOC eprint("malloc failed\n");
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#define LENGTH(x) sizeof(x)/sizeof(x[0])
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typedef unsigned int (*Parser)(const char *, const char *);
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struct Tag {
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char *search;
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int process;
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char *tag;
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};
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void eprint(const char *format, ...); /* Prints error and exits */
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void hprint(const char *begin, const char *end); /* escapes HTML and prints it to stdout*/
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unsigned int dolineprefix(const char *begin, const char *end);
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/* Parser for line prefix tags */
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unsigned int dolink(const char *begin, const char *end);
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/* Parser for links and images */
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unsigned int dolist(const char *begin, const char *end);
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/* Parser for lists */
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unsigned int doreplace(const char *begin, const char *end);
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/* Parser for simple replaces */
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unsigned int doshortlink(const char *begin, const char *end);
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/* Parser for links and images */
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unsigned int dosurround(const char *begin, const char *end);
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/* Parser for surrounding tags */
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unsigned int dounderline(const char *begin, const char *end);
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/* Parser for underline tags */
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void process(const char *begin, const char *end); /* Processes range between begin and end. */
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Parser parsers[] = { dounderline, dolineprefix, dosurround, dolist,
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dolink, doshortlink, doreplace }; /* list of parsers */
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FILE *source;
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unsigned int bsize = 0, nohtml = 0;
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struct Tag lineprefix[] = {
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{ " ", 0, "pre" },
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{ "\t", 0, "pre" },
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{ "> ", 1, "blockquote" },
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{ "####### ", 1, "h7" },
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{ "###### ", 1, "h6" },
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{ "##### ", 1, "h5" },
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{ "#### ", 1, "h4" },
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{ "### ", 1, "h3" },
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{ "## ", 1, "h2" },
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{ "# ", 1, "h1" },
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};
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struct Tag underline[] = {
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{ "=", 1, "h1" },
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{ "-", 1, "h2" },
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};
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struct Tag surround[] = {
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{ "``", 0, "code" },
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{ "`", 0, "code" },
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{ "__", 1, "strong" },
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{ "**", 1, "strong" },
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{ "*", 1, "em" },
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{ "_", 1, "em" },
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};
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char * replace[][2] = {
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{ "\n---\n", "\n<hr />\n" },
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{ "\n\n", "<br />\n<br />\n" },
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{ " #######\n", "\n" },
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{ " ######\n", "\n" },
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{ " #####\n", "\n" },
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{ " ####\n", "\n" },
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{ " ###\n", "\n" },
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{ " ##\n", "\n" },
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{ " #\n", "\n" },
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};
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void
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eprint(const char *format, ...) {
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va_list ap;
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va_start(ap, format);
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vfprintf(stderr, format, ap);
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va_end(ap);
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exit(EXIT_FAILURE);
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}
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void
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hprint(const char *begin, const char *end) {
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const char *p;
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for(p = begin; p && p != end; p++) {
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if(*p == '&') fputs("&",stdout);
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else if(*p == '"') fputs(""",stdout);
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else if(*p == '>') fputs(">",stdout);
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else if(*p == '<') fputs("<",stdout);
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else putchar(*p);
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}
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}
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unsigned int
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dolineprefix(const char *begin, const char *end) {
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unsigned int i, j, l;
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char *buffer;
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const char *p;
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if(*begin != '\n' && *begin != '\0')
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return 0;
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for(i = 0; i < LENGTH(lineprefix); i++) {
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l = strlen(lineprefix[i].search);
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if(end - begin+1 < l)
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continue;
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if(strncmp(lineprefix[i].search,begin+1,l))
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continue;
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if(!(buffer = malloc(end - begin+1)))
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ERRMALLOC;
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printf("<%s>",lineprefix[i].tag);
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for(p = begin, j = 0; p != end; p++, j++) {
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buffer[j] = *p;
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if(*p == '\n') {
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if(strncmp(lineprefix[i].search,p+1,l) != 0)
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break;
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p += l;
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}
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}
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if(lineprefix[i].process)
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process(buffer,buffer+strlen(buffer));
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else
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hprint(buffer,buffer+strlen(buffer));
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printf("</%s>",lineprefix[i].tag);
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free(buffer);
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return p - begin;
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}
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return 0;
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}
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unsigned int
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dolink(const char *begin, const char *end) {
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int img;
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const char *desc, *link, *p;
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unsigned int desclen, linklen;
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if(*begin != '[' && strncmp(begin,"![",2) != 0)
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return 0;
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img = 1;
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if(*begin == '[')
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img = 0;
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desc = begin + 1 + img;
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if(!(p = strstr(desc, "](")) || p > end)
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return 0;
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desclen = p - desc;
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link = p + 2;
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if(!(p = strstr(link, ")")) || p > end)
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return 0;
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linklen = p - link;
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if(img) {
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fputs("<img src=\"",stdout);
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process(link,link+linklen);
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fputs("\" alt=\"",stdout);
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process(desc,desc+desclen);
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fputs("\" />",stdout);
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}
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else {
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fputs("<a href=\"",stdout);
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process(link,link+linklen);
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fputs("\">",stdout);
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process(desc,desc+desclen);
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fputs("</a>",stdout);
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}
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return p + 1 - begin;
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}
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unsigned int
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dolist(const char *begin, const char *end) {
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unsigned int i,j,k,indent,run,ul;
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const char *p;
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char *buffer;
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if(*begin != '\n' || !p[1])
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return 0;
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if(strchr("+-*",p[1])) {
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p++;
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ul = 1;
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}
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else {
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for(p = begin + 1; *p && p != end && *p <= '0' && *p >= '9';p++);
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p++;
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if(!*p || p[0] != '.' || p[1] != ' ')
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return 0;
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ul = 0;
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}
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for(p++; *p && p != end && *p == ' '; p++);
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indent = p - begin - 1;
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if(!(buffer = malloc(end - begin+1)))
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ERRMALLOC;
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puts(ul ? "<ul>" : "<ol>");
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run = 1;
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for(i = 0, p = begin+1+indent; *p && p != end && run; p++) {
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buffer[0] = '\0';
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for(i = 0; *p && p != end && run; p++,i++) {
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if(*p == '\n') {
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if(p[1] == '\n') {
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run = 0;
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break;
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}
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else if(p[1] == ' ') {
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p += indent + 1;
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}
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else if(p[1] >= '0' && p[1] <= '9' || strchr("+-*",p[1])) {
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p += indent;
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break;
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}
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buffer[i++] = '\n';
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}
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buffer[i] = *p;
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}
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fputs("<li>",stdout);
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process(buffer,buffer+i);
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fputs("</li>\n",stdout);
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}
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puts(ul ? "<ul>" : "<ol>");
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free(buffer);
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return p - begin;
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}
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unsigned int
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doreplace(const char *begin, const char *end) {
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unsigned int i, l;
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for(i = 0; i < LENGTH(replace); i++) {
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l = strlen(replace[i][0]);
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if(end - begin < l)
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continue;
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if(strncmp(replace[i][0],begin,l) == 0) {
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fputs(replace[i][1], stdout);
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return l;
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}
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}
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return 0;
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}
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unsigned int
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doshortlink(const char *begin, const char *end) {
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const char *p, *c;
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int ismail = 0;
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if(*begin != '<')
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return 0;
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for(p = begin+1; p && p != end && !strchr(" \t\n",*p); p++) {
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switch(*p) {
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case ':':
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ismail = -1;
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break;
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case '@':
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if(ismail == 0)
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ismail = 1;
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break;
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case '>':
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if(ismail == 0)
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return 0;
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fputs("<a href=\"",stdout);
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if(ismail == 1) {
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/* mailto: */
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fputs("mailto:",stdout);
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for(c = begin+1; *c != '>'; c++) {
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printf("&#%u;",*c);
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}
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fputs("\">",stdout);
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for(c = begin+1; *c != '>'; c++) {
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printf("&#%u;",*c);
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}
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}
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else {
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hprint(begin+1,p);
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fputs("\">",stdout);
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hprint(begin+1,p);
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}
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fputs("</a>",stdout);
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return p - begin + 1;
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}
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}
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return 0;
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}
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unsigned int
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dosurround(const char *begin, const char *end) {
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unsigned int i,l;
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const char *p,*ps;
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for(i = 0; i < LENGTH(surround); i++) {
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l = strlen(surround[i].search);
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if(end - begin < l || strncmp(begin,surround[i].search,l) != 0)
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continue;
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for(ps = surround[i].search; *ps == '\n'; ps++);
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l = strlen(ps);
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p = begin + strlen(surround[i].search) - 1;
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do {
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p = strstr(p+1, ps);
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} while(p && p[-1] == '\\');
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if(!p || p > end)
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continue;
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printf("<%s>",surround[i].tag);
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if(surround[i].process)
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process(begin + strlen(surround[i].search), p);
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else
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hprint(begin + strlen(surround[i].search), p);
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printf("</%s>",surround[i].tag);
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return p - begin + l;
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}
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return 0;
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}
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unsigned int
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dounderline(const char *begin, const char *end) {
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unsigned int i, j, l;
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const char *p;
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if(*begin != '\n' && *begin != '\0')
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return 0;
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for(p = begin+1,l = 0; p[l] != '\n' && p[l] && p+l != end; l++);
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p += l + 1;
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if(l == 0)
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return 0;
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for(i = 0; i < LENGTH(underline); i++) {
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for(j = 0; p[j] != '\n' && p[j] == underline[i].search[0] && p+j != end; j++);
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if(j >= l) {
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putchar('\n');
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printf("<%s>",underline[i].tag);
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if(underline[i].process)
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process(begin+1, begin + l + 1);
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else
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hprint(begin+1, begin + l + 1);
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printf("</%s>",underline[i].tag);
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return j + l + 2;
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}
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}
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return 0;
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}
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void
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process(const char *begin, const char *end) {
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const char *p;
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int affected;
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unsigned int i;
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for(p = begin; *p && p != end;) {
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affected = 0;
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for(i = 0; i < LENGTH(parsers) && affected == 0; i++)
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affected = parsers[i](p, end);
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if(affected == 0) {
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if(nohtml)
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hprint(p,p+1);
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else
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putchar(*p);
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p++;
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}
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else
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p += affected;
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}
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}
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int
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main(int argc, char *argv[]) {
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char *p, *buffer;
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int s;
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source = stdin;
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if(argc > 1 && strcmp("-v", argv[1]) == 0)
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eprint("markdown in C %s (C) Enno Boland\n",VERSION);
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else if(argc > 1 && strcmp("-h", argv[1]) == 0)
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eprint("Usage %s [-n] [file]\n -n escape html strictly\n",argv[0]);
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if(argc > 1 && strcmp("-n", argv[1]) == 0)
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nohtml = 1;
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if(argc > 1 + nohtml && strcmp("-", argv[1 + nohtml]) != 0 && !(source = fopen(argv[1 + nohtml],"r")))
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eprint("Cannot open file `%s`\n",argv[1 + nohtml]);
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if(!(buffer = malloc(BUFFERSIZE)))
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ERRMALLOC;
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bsize = BUFFERSIZE;
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/* needed to properly process first line */
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strcpy(buffer,"\n");
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p = buffer+strlen(buffer);
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while(s = fread(p, sizeof(char),BUFFERSIZE, source)) {
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p += s;
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*p = '\0';
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if(BUFFERSIZE + strlen(buffer) > bsize) {
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bsize += BUFFERSIZE;
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if(!(buffer = realloc(buffer, bsize)))
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ERRMALLOC;
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}
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}
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process(buffer,buffer+strlen(buffer));
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free(buffer);
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}
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