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/* markdown: a C implementation of John Gruber's Markdown markup language.
*
* Copyright (C) 2007 David L Parsons.
* The redistribution terms are provided in the COPYRIGHT file that must
* be distributed with this source code.
*/
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <time.h>
#include <ctype.h>
#include "config.h"
#include "cstring.h"
#include "markdown.h"
#include "amalloc.h"
/* prefixes for <automatic links>
*/
static char *autoprefix[] = { "http://", "https://", "ftp://", "news://" };
#define SZAUTOPREFIX (sizeof autoprefix / sizeof autoprefix[0])
typedef int (*stfu)(const void*,const void*);
/* forward declarations */
static int iscodeblock(MMIOT*);
static void code(int, MMIOT*);
static void text(MMIOT *f);
static Paragraph *display(Paragraph*, MMIOT*);
/* externals from markdown.c */
int __mkd_footsort(Footnote *, Footnote *);
/*
* push text into the generator input buffer
*/
static void
push(char *bfr, int size, MMIOT *f)
{
while ( size-- > 0 )
EXPAND(f->in) = *bfr++;
}
/* look <i> characters ahead of the cursor.
*/
static int
peek(MMIOT *f, int i)
{
i += (f->isp-1);
return (i >= 0) && (i < S(f->in)) ? T(f->in)[i] : EOF;
}
/* pull a byte from the input buffer
*/
static int
pull(MMIOT *f)
{
return ( f->isp < S(f->in) ) ? T(f->in)[f->isp++] : EOF;
}
/* return a pointer to the current position in the input buffer.
*/
static char*
cursor(MMIOT *f)
{
return T(f->in) + f->isp;
}
static int
isthisspace(MMIOT *f, int i)
{
int c = peek(f, i);
return isspace(c) || (c == EOF);
}
static int
isthisalnum(MMIOT *f, int i)
{
int c = peek(f, i);
return (c != EOF) && isalnum(c);
}
static int
isthisnonword(MMIOT *f, int i)
{
return isthisspace(f, i) || ispunct(peek(f,i));
}
/* return/set the current cursor position
*/
#define mmiotseek(f,x) (f->isp = x)
#define mmiottell(f) (f->isp)
/* move n characters forward ( or -n characters backward) in the input buffer.
*/
static void
shift(MMIOT *f, int i)
{
if (f->isp + i >= 0 )
f->isp += i;
}
/* Qchar()
*/
static void
Qchar(char c, MMIOT *f)
{
block *cur;
if ( S(f->Q) == 0 ) {
cur = &EXPAND(f->Q);
memset(cur, 0, sizeof *cur);
cur->b_type = bTEXT;
}
else
cur = &T(f->Q)[S(f->Q)-1];
EXPAND(cur->b_text) = c;
}
/* Qstring()
*/
static void
Qstring(char *s, MMIOT *f)
{
while (*s)
Qchar(*s++, f);
}
/* Qwrite()
*/
static void
Qwrite(char *s, int size, MMIOT *f)
{
while (size-- > 0)
Qchar(*s++, f);
}
/* Qprintf()
*/
static void
Qprintf(MMIOT *f, char *fmt, ...)
{
char bfr[80];
va_list ptr;
va_start(ptr,fmt);
vsnprintf(bfr, sizeof bfr, fmt, ptr);
va_end(ptr);
Qstring(bfr, f);
}
/* Qem()
*/
static void
Qem(MMIOT *f, char c, int count)
{
block *p = &EXPAND(f->Q);
memset(p, 0, sizeof *p);
p->b_type = (c == '*') ? bSTAR : bUNDER;
p->b_char = c;
p->b_count = count;
memset(&EXPAND(f->Q), 0, sizeof(block));
}
/* empair()
*/
static int
empair(MMIOT *f, int go, int level)
{
int i;
block *begin, *p;
begin = &T(f->Q)[go];
for (i=go+1; i < S(f->Q); i++) {
p = &T(f->Q)[i];
if ( (p->b_type != bTEXT) && (p->b_count <= 0) )
break;
if ( p->b_type == begin->b_type ) {
if ( p->b_count == level ) /* exact match */
return i-go;
if ( p->b_count > 2 ) /* fuzzy match */
return i-go;
}
}
return EOF;
}
static struct emtags {
char open[10];
char close[10];
int size;
} emtags[] = { { "<em>" , "</em>", 5 }, { "<strong>", "</strong>", 9 } };
static void
emclose(Cstring *s, int level)
{
PREFIX(*s, emtags[level-1].close, emtags[level-1].size);
}
static void
emopen(Cstring *s, int level)
{
SUFFIX(*s, emtags[level-1].open, emtags[level-1].size-1);
}
/* emmatch()
*/
static void
emmatch(MMIOT *f, int go)
{
block *start = &T(f->Q)[go], *end;
int e, e2, i, match;
while ( start->b_count ) {
switch (start->b_count) {
case 2: e = empair(f,go,match=2);
if ( e != EOF ) break;
case 1: e = empair(f,go,match=1); break;
default:
e = empair(f,go,1);
e2= empair(f,go,2);
if ( e == EOF || ((e2 != EOF) && (e2 >= e)) ) {
e = e2;
match = 2;
}
else
match = 1;
}
if ( e != EOF ) {
end = &T(f->Q)[go+e];
emclose(&end->b_post, match);
emopen(&start->b_text, match);
end->b_count -= match;
}
else {
for (i=0; i < match; i++)
EXPAND(start->b_text) = start->b_char;
}
start->b_count -= match;
}
}
/* ___mkd_emblock()
*/
void
___mkd_emblock(MMIOT *f)
{
int i;
block *p;
for (i=0; i < S(f->Q); i++) {
p = &T(f->Q)[i];
if ( p->b_type != bTEXT ) emmatch(f, i);
if ( S(p->b_post) ) { SUFFIX(f->out, T(p->b_post), S(p->b_post));
DELETE(p->b_post); }
if ( S(p->b_text) ) { SUFFIX(f->out, T(p->b_text), S(p->b_text));
DELETE(p->b_text); }
}
S(f->Q) = 0;
}
/* generate html from a markup fragment
*/
void
___mkd_reparse(char *bfr, int size, int flags, MMIOT *f)
{
MMIOT sub;
___mkd_initmmiot(&sub, f->footnotes);
sub.flags = f->flags | flags;
sub.base = f->base;
push(bfr, size, &sub);
EXPAND(sub.in) = 0;
S(sub.in)--;
text(&sub);
___mkd_emblock(&sub);
Qwrite(T(sub.out), S(sub.out), f);
___mkd_freemmiot(&sub, f->footnotes);
}
/*
* write out a url, escaping problematic characters
*/
static void
puturl(char *s, int size, MMIOT *f)
{
unsigned char c;
while ( size-- > 0 ) {
c = *s++;
if ( c == '&' )
Qstring("&amp;", f);
else if ( c == '<' )
Qstring("&lt;", f);
else if ( isalnum(c) || ispunct(c) )
Qchar(c, f);
else
Qprintf(f, "%%%02X", c);
}
}
/* advance forward until the next character is not whitespace
*/
static int
eatspace(MMIOT *f)
{
int c;
for ( ; ((c=peek(f, 1)) != EOF) && isspace(c); pull(f) )
;
return c;
}
/* (match (a (nested (parenthetical (string.)))))
*/
static int
parenthetical(int in, int out, MMIOT *f)
{
int size, indent, c;
for ( indent=1,size=0; indent; size++ ) {
if ( (c = pull(f)) == EOF )
return EOF;
else if ( c == in )
++indent;
else if ( c == out )
--indent;
}
return size-1;
}
/* extract a []-delimited label from the input stream.
*/
static char *
linkylabel(MMIOT *f, int *sizep)
{
char *ptr = cursor(f);
if ( (*sizep = parenthetical('[',']',f)) != EOF )
return ptr;
return 0;
}
/* extract a (-prefixed url from the input stream.
* the label is either of the format `<link>`, where I
* extract until I find a >, or it is of the format
* `text`, where I extract until I reach a ')' or
* whitespace.
*/
static char*
linkyurl(MMIOT *f, int *sizep)
{
int size = 0;
char *ptr;
int c;
if ( (c = eatspace(f)) == EOF )
return 0;
ptr = cursor(f);
if ( c == '<' ) {
pull(f);
ptr++;
if ( (size = parenthetical('<', '>', f)) == EOF )
return 0;
}
else {
for ( ; ((c=pull(f)) != ')') && !isspace(c); size++)
if ( c == EOF ) return 0;
if ( c == ')' )
shift(f, -1);
}
*sizep = size;
return ptr;
}
/* extract a =HHHxWWW size from the input stream
*/
static int
linkysize(MMIOT *f, int *heightp, int *widthp)
{
int height=0, width=0;
int c;
*heightp = 0;
*widthp = 0;
if ( (c = eatspace(f)) != '=' )
return (c != EOF);
pull(f); /* eat '=' */
for ( c = pull(f); isdigit(c); c = pull(f))
width = (width * 10) + (c - '0');
if ( c == 'x' ) {
for ( c = pull(f); isdigit(c); c = pull(f))
height = (height*10) + (c - '0');
if ( c != EOF ) {
if ( !isspace(c) ) shift(f, -1);
*heightp = height;
*widthp = width;
return 1;
}
}
return 0;
}
/* extract a )-terminated title from the input stream.
*/
static char*
linkytitle(MMIOT *f, int *sizep)
{
int countq=0, qc, c, size;
char *ret, *lastqc = 0;
eatspace(f);
if ( (qc=pull(f)) != '"' && qc != '\'' && qc != '(' )
return 0;
if ( qc == '(' ) qc = ')';
for ( ret = cursor(f); (c = pull(f)) != EOF; ) {
if ( (c == ')') && countq ) {
size = (lastqc ? lastqc : cursor(f)) - ret;
*sizep = size-1;
return ret;
}
else if ( c == qc ) {
lastqc = cursor(f);
countq++;
}
}
return 0;
}
/* look up (or construct) a footnote from the [xxx] link
* at the head of the stream.
*/
static int
linkykey(int image, Footnote *val, MMIOT *f)
{
Footnote *ret;
Cstring mylabel;
int here;
memset(val, 0, sizeof *val);
if ( (T(val->tag) = linkylabel(f, &S(val->tag))) == 0 )
return 0;
here = mmiottell(f);
eatspace(f);
switch ( pull(f) ) {
case '(':
/* embedded link */
if ( (T(val->link) = linkyurl(f,&S(val->link))) == 0 )
return 0;
if ( image && !linkysize(f, &val->height, &val->width) )
return 0;
T(val->title) = linkytitle(f, &S(val->title));
return peek(f,0) == ')';
case '[': /* footnote links /as defined in the standard/ */
default: /* footnote links -- undocumented extension */
/* footnote link */
mylabel = val->tag;
if ( peek(f,0) == '[' ) {
if ( (T(val->tag) = linkylabel(f, &S(val->tag))) == 0 )
return 0;
if ( !S(val->tag) )
val->tag = mylabel;
}
else if ( f->flags & MKD_1_COMPAT )
break;
else
mmiotseek(f,here);
ret = bsearch(val, T(*f->footnotes), S(*f->footnotes),
sizeof *val, (stfu)__mkd_footsort);
if ( ret ) {
val->tag = mylabel;
val->link = ret->link;
val->title = ret->title;
val->height = ret->height;
val->width = ret->width;
return 1;
}
}
return 0;
}
/*
* all the tag types that linkylinky can produce are
* defined by this structure.
*/
typedef struct linkytype {
char *pat;
int szpat;
char *link_pfx; /* tag prefix and link pointer (eg: "<a href="\"" */
char *link_sfx; /* link suffix (eg: "\"" */
int WxH; /* this tag allows width x height arguments */
char *text_pfx; /* text prefix (eg: ">" */
char *text_sfx; /* text suffix (eg: "</a>" */
int flags; /* reparse flags */
} linkytype;
static linkytype imaget = { 0, 0, "<img src=\"", "\"",
1, " alt=\"", "\" />", DENY_IMG|INSIDE_TAG };
static linkytype linkt = { 0, 0, "<a href=\"", "\"",
0, ">", "</a>", DENY_A };
/*
* pseudo-protocols for [][];
*
* id: generates <a id="link">tag</a>
* class: generates <span class="link">tag</span>
* raw: just dump the link without any processing
*/
static linkytype specials[] = {
{ "id:", 3, "<a id=\"", "\"", 0, ">", "</a>", 0 },
{ "class:", 6, "<span class=\"", "\"", 0, ">", "</span>", 0 },
{ "raw:", 4, 0, 0, 0, 0, 0, 0 },
} ;
#define NR(x) (sizeof x / sizeof x[0])
/* see if t contains one of our pseudo-protocols.
*/
static linkytype *
extratag(Cstring t)
{
int i;
linkytype *r;
for ( i=0; i < NR(specials); i++ ) {
r = &specials[i];
if ( (S(t) > r->szpat) && (strncasecmp(T(t), r->pat, r->szpat) == 0) )
return r;
}
return 0;
}
/*
* process embedded links and images
*/
static int
linkylinky(int image, MMIOT *f)
{
int start = mmiottell(f);
Footnote link;
linkytype *tag;
if ( !linkykey(image, &link, f) ) {
mmiotseek(f, start);
return 0;
}
if ( image )
tag = &imaget;
else if ( (f->flags & NO_PSEUDO_PROTO) || (tag = extratag(link.link)) == 0 )
tag = &linkt;
if ( f->flags & tag-> flags ) {
mmiotseek(f, start);
return 0;
}
if ( tag->link_pfx ) {
Qstring(tag->link_pfx, f);
if ( f->base && (T(link.link)[tag->szpat] == '/') )
puturl(f->base, strlen(f->base), f);
puturl(T(link.link) + tag->szpat, S(link.link) - tag->szpat, f);
Qstring(tag->link_sfx, f);
if ( tag->WxH && link.height && link.width ) {
Qprintf(f," height=\"%d\"", link.height);
Qprintf(f, " width=\"%d\"", link.width);
}
if ( S(link.title) ) {
Qstring(" title=\"", f);
___mkd_reparse(T(link.title), S(link.title), INSIDE_TAG, f);
Qchar('"', f);
}
Qstring(tag->text_pfx, f);
___mkd_reparse(T(link.tag), S(link.tag), tag->flags, f);
Qstring(tag->text_sfx, f);
}
else
Qwrite(T(link.link) + tag->szpat, S(link.link) - tag->szpat, f);
return 1;
}
/* write a character to output, doing text escapes ( & -> &amp;,
* > -> &gt; < -> &lt; )
*/
static void
cputc(int c, MMIOT *f)
{
switch (c) {
case '&': Qstring("&amp;", f); break;
case '>': Qstring("&gt;", f); break;
case '<': Qstring("&lt;", f); break;
default : Qchar(c, f); break;
}
}
/*
* convert an email address to a string of nonsense
*/
static void
mangle(char *s, int len, MMIOT *f)
{
while ( len-- > 0 ) {
Qstring("&#", f);
Qprintf(f, COINTOSS() ? "x%02x;" : "%02d;", *((unsigned char*)(s++)) );
}
}
/* before letting a tag through, validate against
* DENY_A and DENY_IMG
*/
static int
forbidden_tag(MMIOT *f)
{
int c = toupper(peek(f, 1));
if ( f->flags & DENY_HTML )
return 1;
if ( c == 'A' && (f->flags & DENY_A) && !isthisalnum(f,2) )
return 1;
if ( c == 'I' && (f->flags & DENY_IMG)
&& strncasecmp(cursor(f)+1, "MG", 2) == 0
&& !isthisalnum(f,4) )
return 1;
return 0;
}
/* a < may be just a regular character, the start of an embedded html
* tag, or the start of an <automatic link>. If it's an automatic
* link, we also need to know if it's an email address because if it
* is we need to mangle it in our futile attempt to cut down on the
* spaminess of the rendered page.
*/
static int
maybe_tag_or_link(MMIOT *f)
{
char *text;
int c, size, i;
int maybetag=1, maybeaddress=0;
int mailto;
if ( f->flags & INSIDE_TAG )
return 0;
for ( size=0; ((c = peek(f,size+1)) != '>') && !isspace(c); size++ ) {
if ( ! (c == '/' || isalnum(c) || c == '~') )
maybetag=0;
if ( c == '@' )
maybeaddress=1;
else if ( c == EOF )
return 0;
}
if ( size == 0 )
return 0;
if ( maybetag || (size >= 3 && strncmp(cursor(f), "!--", 3) == 0) ) {
Qstring(forbidden_tag(f) ? "&lt;" : "<", f);
while ( ((c = peek(f, 1)) != EOF) && (c != '>') )
cputc(pull(f), f);
return 1;
}
if ( f->flags & DENY_A ) return 0;
text = cursor(f);
shift(f, size+1);
for ( i=0; i < SZAUTOPREFIX; i++ )
if ( strncasecmp(text, autoprefix[i], strlen(autoprefix[i])) == 0 ) {
Qstring("<a href=\"", f);
puturl(text,size,f);
Qstring("\">", f);
puturl(text,size,f);
Qstring("</a>", f);
return 1;
}
if ( maybeaddress ) {
Qstring("<a href=\"", f);
if ( (size > 7) && strncasecmp(text, "mailto:", 7) == 0 )
mailto = 7;
else {
mailto = 0;
/* supply a mailto: protocol if one wasn't attached */
mangle("mailto:", 7, f);
}
mangle(text, size, f);
Qstring("\">", f);
mangle(text+mailto, size-mailto, f);
Qstring("</a>", f);
return 1;
}
shift(f, -(size+1));
return 0;
} /* maybe_tag_or_link */
/* smartyquote code that's common for single and double quotes
*/
static int
smartyquote(int *flags, char typeofquote, MMIOT *f)
{
int bit = (typeofquote == 's') ? 0x01 : 0x02;
if ( bit & (*flags) ) {
if ( isthisnonword(f,1) ) {
Qprintf(f, "&r%cquo;", typeofquote);
(*flags) &= ~bit;
return 1;
}
}
else if ( isthisnonword(f,-1) && peek(f,1) != EOF ) {
Qprintf(f, "&l%cquo;", typeofquote);
(*flags) |= bit;
return 1;
}
return 0;
}
static int
islike(MMIOT *f, char *s)
{
int len;
int i;
if ( s[0] == '<' ) {
if ( !isthisnonword(f, -1) )
return 0;
++s;
}
if ( !(len = strlen(s)) )
return 0;
if ( s[len-1] == '>' ) {
if ( !isthisnonword(f,len-1) )
return 0;
len--;
}
for (i=1; i < len; i++)
if (tolower(peek(f,i)) != s[i])
return 0;
return 1;
}
static struct smarties {
char c0;
char *pat;
char *entity;
int shift;
} smarties[] = {
{ '\'', "'s>", "rsquo", 0 },
{ '\'', "'t>", "rsquo", 0 },
{ '-', "--", "mdash", 1 },
{ '-', "<->", "ndash", 0 },
{ '.', "...", "hellip", 2 },
{ '.', ". . .", "hellip", 4 },
{ '(', "(c)", "copy", 2 },
{ '(', "(r)", "reg", 2 },
{ '(', "(tm)", "trade", 3 },
{ '3', "<3/4>", "frac34", 2 },
{ '3', "<3/4ths>", "frac34", 2 },
{ '1', "<1/2>", "frac12", 2 },
{ '1', "<1/4>", "frac14", 2 },
{ '1', "<1/4th>", "frac14", 2 },
{ '&', "&#0;", 0, 3 },
} ;
#define NRSMART ( sizeof smarties / sizeof smarties[0] )
/* Smarty-pants-style chrome for quotes, -, ellipses, and (r)(c)(tm)
*/
static int
smartypants(int c, int *flags, MMIOT *f)
{
int i;
if ( f->flags & DENY_SMARTY )
return 0;
for ( i=0; i < NRSMART; i++)
if ( (c == smarties[i].c0) && islike(f, smarties[i].pat) ) {
if ( smarties[i].entity )
Qprintf(f, "&%s;", smarties[i].entity);
shift(f, smarties[i].shift);
return 1;
}
switch (c) {
case '<' : return 0;
case '\'': if ( smartyquote(flags, 's', f) ) return 1;
break;
case '"': if ( smartyquote(flags, 'd', f) ) return 1;
break;
case '`': if ( peek(f, 1) == '`' ) {
int j = 2;
while ( (c=peek(f,j)) != EOF ) {
if ( c == '\\' )
j += 2;
else if ( c == '`' )
break;
else if ( c == '\'' && peek(f, j+1) == '\'' ) {
Qstring("&ldquo;", f);
___mkd_reparse(cursor(f)+1, j-2, 0, f);
Qstring("&rdquo;", f);
shift(f,j+1);
return 1;
}
else ++j;
}
}
break;
}
return 0;
} /* smartypants */
#define tag_text(f) (f->flags & INSIDE_TAG)
static void
text(MMIOT *f)
{
int c, j;
int rep;
int smartyflags = 0;
while ( (c = pull(f)) != EOF ) {
if ( smartypants(c, &smartyflags, f) )
continue;
switch (c) {
case 0: break;
case '>': if ( tag_text(f) )
Qstring("&gt;", f);
else
Qchar(c, f);
break;
case '"': if ( tag_text(f) )
Qstring("&quot;", f);
else
Qchar(c, f);
break;
case '!': if ( peek(f,1) == '[' ) {
pull(f);
if ( tag_text(f) || !linkylinky(1, f) )
Qstring("![", f);
}
else
Qchar(c, f);
break;
case '[': if ( tag_text(f) || !linkylinky(0, f) )
Qchar(c, f);
break;
#if SUPERSCRIPT
/* A^B -> A<sup>B</sup> */
case '^': if ( (f->flags & (STRICT|INSIDE_TAG)) || isthisspace(f,-1) || isthisspace(f,1) )
Qchar(c,f);
else {
char *sup = cursor(f);
int len = 0;
Qstring("<sup>",f);
while ( !isthisspace(f,1+len) ) {
++len;
}
shift(f,len);
___mkd_reparse(sup, len, 0, f);
Qstring("</sup>", f);
}
break;
#endif
case '_':
#if RELAXED_EMPHASIS
/* Underscores don't count if they're in the middle of a word */
if ( (!(f->flags & STRICT))
&& ((isthisspace(f,-1) && isthisspace(f,1))
|| (isthisalnum(f,-1) && isthisalnum(f,1))) ){
Qchar(c, f);
break;
}
/* else fall into the regular old emphasis case */
#endif
case '*': if ( tag_text(f) )
Qchar(c, f);
else {
for (rep = 1; peek(f,1) == c; pull(f) )
++rep;
Qem(f,c,rep);
}
break;
case '`': if ( tag_text(f) || !iscodeblock(f) )
Qchar(c, f);
else {
Qstring("<code>", f);
if ( peek(f, 1) == '`' ) {
pull(f);
code(2, f);
}
else
code(1, f);
Qstring("</code>", f);
}
break;
case '\\': switch ( c = pull(f) ) {
case '&': Qstring("&amp;", f);
break;
case '<': Qstring("&lt;", f);
break;
case '\\':
case '>': case '#': case '.': case '-':
case '+': case '{': case '}': case ']':
case '(': case ')': case '"': case '\'':
case '!': case '[': case '*': case '_':
case '`': Qchar(c, f);
break;
default:
Qchar('\\', f);
if ( c != EOF )
shift(f,-1);
break;
}
break;
case '<': if ( !maybe_tag_or_link(f) )
Qstring("&lt;", f);
break;
case '&': j = (peek(f,1) == '#' ) ? 2 : 1;
while ( isthisalnum(f,j) )
++j;
if ( peek(f,j) != ';' )
Qstring("&amp;", f);
else
Qchar(c, f);
break;
default: Qchar(c, f);
break;
}
}
/* truncate the input string after we've finished processing it */
S(f->in) = f->isp = 0;
} /* text */
static int
iscodeblock(MMIOT *f)
{
int i=1, single = 1, c;
if ( peek(f,i) == '`' ) {
single=0;
i++;
}
while ( (c=peek(f,i)) != EOF ) {
if ( (c == '`') && (single || peek(f,i+1) == '`') )
return 1;
else if ( c == '\\' )
i++;
i++;
}
return 0;
}
static int
endofcode(int escape, int offset, MMIOT *f)
{
switch (escape) {
case 2: if ( peek(f, offset+1) == '`' ) {
shift(f,1);
case 1: shift(f,offset);
return 1;
}
default:return 0;
}
}
/* the only characters that have special meaning in a code block are
* `<' and `&' , which are /always/ expanded to &lt; and &amp;
*/
static void
code(int escape, MMIOT *f)
{
int c;
if ( escape && (peek(f,1) == ' ') )
shift(f,1);
while ( (c = pull(f)) != EOF ) {
switch (c) {
case ' ': if ( peek(f,1) == '`' && endofcode(escape, 1, f) )
return;
Qchar(c, f);
break;
case '`': if ( endofcode(escape, 0, f) )
return;
Qchar(c, f);
break;
case '\\': cputc(c, f);
if ( peek(f,1) == '>' || (c = pull(f)) == EOF )
break;
default: cputc(c, f);
break;
}
}
} /* code */
/* print a header block
*/
static void
printheader(Paragraph *pp, MMIOT *f)
{
Qprintf(f, "<h%d", pp->hnumber);
if ( f->flags & TOC ) {
Qprintf(f, " id=\"", pp->hnumber);
mkd_string_to_anchor(T(pp->text->text), S(pp->text->text), Qchar, f);
Qchar('"', f);
}
Qchar('>', f);
push(T(pp->text->text), S(pp->text->text), f);
text(f);
Qprintf(f, "</h%d>", pp->hnumber);
}
static int
printblock(Paragraph *pp, MMIOT *f)
{
Line *t = pp->text;
static char *Begin[] = { "", "<p>", "<center>" };
static char *End[] = { "", "</p>","</center>" };
while (t) {
if ( S(t->text) ) {
if ( S(t->text) > 2 && T(t->text)[S(t->text)-2] == ' '
&& T(t->text)[S(t->text)-1] == ' ') {
push(T(t->text), S(t->text)-2, f);
push("<br/>\n", 6, f);
}
else {
___mkd_tidy(t);
push(T(t->text), S(t->text), f);
if ( t->next )
push("\n", 1, f);
}
}
t = t->next;
}
Qstring(Begin[pp->align], f);
text(f);
Qstring(End[pp->align], f);
return 1;
}
static void
printcode(Line *t, MMIOT *f)
{
int blanks;
for ( blanks = 0; t ; t = t->next )
if ( S(t->text) > t->dle ) {
while ( blanks ) {
push("\n", 1, f);
--blanks;
}
push(T(t->text), S(t->text), f);
push("\n", 1, f);
}
else blanks++;
Qstring("<pre><code>", f);
code(0, f);
Qstring("</code></pre>", f);
}
static void
printhtml(Line *t, MMIOT *f)
{
int blanks;
for ( blanks=0; t ; t = t->next )
if ( S(t->text) ) {
for ( ; blanks; --blanks )
Qchar('\n', f);
Qwrite(T(t->text), S(t->text), f);
Qchar('\n', f);
}
else
blanks++;
}
static void
htmlify(Paragraph *p, char *block, char *arguments, MMIOT *f)
{
___mkd_emblock(f);
if ( block )
Qprintf(f, arguments ? "<%s %s>" : "<%s>", block, arguments);
___mkd_emblock(f);
while (( p = display(p, f) )) {
___mkd_emblock(f);
Qstring("\n\n", f);
}
if ( block )
Qprintf(f, "</%s>", block);
___mkd_emblock(f);
}
#if DL_TAG_EXTENSION
static void
definitionlist(Paragraph *p, MMIOT *f)
{
Line *tag;
if ( p ) {
Qstring("<dl>\n", f);
for ( ; p ; p = p->next) {
for ( tag = p->text; tag; tag = tag->next ) {
Qstring("<dt>", f);
___mkd_reparse(T(tag->text), S(tag->text), 0, f);
Qstring("</dt>\n", f);
}
htmlify(p->down, "dd", p->ident, f);
}
Qstring("</dl>", f);
}
}
#endif
static void
listdisplay(int typ, Paragraph *p, MMIOT* f)
{
if ( p ) {
Qprintf(f, "<%cl", (typ==UL)?'u':'o');
if ( typ == AL )
Qprintf(f, " type=a");
Qprintf(f, ">\n");
for ( ; p ; p = p->next ) {
htmlify(p->down, "li", p->ident, f);
Qchar('\n', f);
}
Qprintf(f, "</%cl>\n", (typ==UL)?'u':'o');
}
}
/* dump out a Paragraph in the desired manner
*/
static Paragraph*
display(Paragraph *p, MMIOT *f)
{
if ( !p ) return 0;
switch ( p->typ ) {
case STYLE:
case WHITESPACE:
break;
case HTML:
printhtml(p->text, f);
break;
case CODE:
printcode(p->text, f);
break;
case QUOTE:
htmlify(p->down, p->ident ? "div" : "blockquote", p->ident, f);
break;
case UL:
case OL:
case AL:
listdisplay(p->typ, p->down, f);
break;
#if DL_TAG_EXTENSION
case DL:
definitionlist(p->down, f);
break;
#endif
case HR:
Qstring("<hr />", f);
break;
case HDR:
printheader(p, f);
break;
default:
printblock(p, f);
break;
}
return p->next;
}
/*
* dump out stylesheet sections.
*/
static int
stylesheets(Paragraph *p, FILE *f)
{
Line* q;
for ( ; p ; p = p->next ) {
if ( p->typ == STYLE ) {
for ( q = p->text; q ; q = q->next )
if ( fwrite(T(q->text), S(q->text), 1, f) == 1 )
putc('\n', f);
else
return EOF;
}
if ( p->down && (stylesheets(p->down, f) == EOF) )
return EOF;
}
return 0;
}
/* return a pointer to the compiled markdown
* document.
*/
int
mkd_document(Document *p, char **res)
{
if ( p && p->compiled ) {
if ( ! p->html ) {
htmlify(p->code, 0, 0, p->ctx);
p->html = 1;
}
*res = T(p->ctx->out);
return S(p->ctx->out);
}
return EOF;
}
/* public interface for ___mkd_reparse()
*/
int
mkd_text(char *bfr, int size, FILE *output, int flags)
{
MMIOT f;
___mkd_initmmiot(&f, 0);
f.flags = flags & USER_FLAGS;
___mkd_reparse(bfr, size, 0, &f);
___mkd_emblock(&f);
if ( flags & CDATA_OUTPUT )
___mkd_xml(T(f.out), S(f.out), output);
else
fwrite(T(f.out), S(f.out), 1, output);
___mkd_freemmiot(&f, 0);
return 0;
}
/* dump any embedded styles
*/
int
mkd_style(Document *d, FILE *f)
{
if ( d && d->compiled )
return stylesheets(d->code, f);
return EOF;
}