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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"
/* block-level tags for passing html blocks through the blender
*/
struct kw {
char *id;
int size;
int selfclose;
};
#define KW(x) \
{ \
x, sizeof(x) - 1, 0 \
}
#define SC(x) \
{ \
x, sizeof(x) - 1, 1 \
}
static struct kw blocktags[] = {
KW("!--"), KW("STYLE"), KW("SCRIPT"), KW("ADDRESS"), KW("BDO"),
KW("BLOCKQUOTE"), KW("CENTER"), KW("DFN"), KW("DIV"), KW("H1"),
KW("H2"), KW("H3"), KW("H4"), KW("H5"), KW("H6"),
KW("LISTING"), KW("NOBR"), KW("UL"), KW("P"), KW("OL"),
KW("DL"), KW("PLAINTEXT"), KW("PRE"), KW("TABLE"), KW("WBR"),
KW("XMP"), SC("HR"), SC("BR"), KW("IFRAME"), KW("MAP")};
#define SZTAGS (sizeof blocktags / sizeof blocktags[0])
#define MAXTAG 11 /* sizeof "BLOCKQUOTE" */
typedef int (*stfu)(const void *, const void *);
typedef ANCHOR(Paragraph) ParagraphRoot;
/* case insensitive string sort (for qsort() and bsearch() of block tags)
*/
static int casort(struct kw *a, struct kw *b)
{
if (a->size != b->size)
return a->size - b->size;
return strncasecmp(a->id, b->id, b->size);
}
/* case insensitive string sort for Footnote tags.
*/
int __mkd_footsort(Footnote *a, Footnote *b)
{
int i;
char ac, bc;
if (S(a->tag) != S(b->tag))
return S(a->tag) - S(b->tag);
for (i = 0; i < S(a->tag); i++) {
ac = tolower(T(a->tag)[i]);
bc = tolower(T(b->tag)[i]);
if (isspace(ac) && isspace(bc))
continue;
if (ac != bc)
return ac - bc;
}
return 0;
}
/* find the first blank character after position <i>
*/
static int nextblank(Line *t, int i)
{
while ((i < S(t->text)) && !isspace(T(t->text)[i]))
++i;
return i;
}
/* find the next nonblank character after position <i>
*/
static int nextnonblank(Line *t, int i)
{
while ((i < S(t->text)) && isspace(T(t->text)[i]))
++i;
return i;
}
/* find the first nonblank character on the Line.
*/
int mkd_firstnonblank(Line *p) { return nextnonblank(p, 0); }
static int blankline(Line *p) { return !(p && (S(p->text) > p->dle)); }
static Line *skipempty(Line *p)
{
while (p && (p->dle == S(p->text)))
p = p->next;
return p;
}
void ___mkd_tidy(Cstring *t)
{
while (S(*t) && isspace(T(*t)[S(*t) - 1]))
--S(*t);
}
static struct kw *isopentag(Line *p)
{
int i = 0, len;
struct kw key, *ret;
if (!p)
return 0;
len = S(p->text);
if (len < 3 || T(p->text)[0] != '<')
return 0;
/* find how long the tag is so we can check to see if
* it's a block-level tag
*/
for (i = 1; i < len && T(p->text)[i] != '>' && T(p->text)[i] != '/' &&
!isspace(T(p->text)[i]);
++i)
;
key.id = T(p->text) + 1;
key.size = i - 1;
if (ret = bsearch(&key, blocktags, SZTAGS, sizeof key, (stfu)casort))
return ret;
return 0;
}
typedef struct _flo {
Line *t;
int i;
} FLO;
static int flogetc(FLO *f)
{
if (f && f->t) {
if (f->i < S(f->t->text))
return T(f->t->text)[f->i++];
f->t = f->t->next;
f->i = 0;
return flogetc(f);
}
return EOF;
}
static Line *htmlblock(Paragraph *p, struct kw *tag)
{
Line *ret;
FLO f = {p->text, 0};
int c;
int i, closing, depth = 0;
if (tag->selfclose || (tag->size >= MAXTAG)) {
ret = f.t->next;
f.t->next = 0;
return ret;
}
while ((c = flogetc(&f)) != EOF) {
if (c == '<') {
/* tag? */
c = flogetc(&f);
if (c == '!') { /* comment? */
if (flogetc(&f) == '-' && flogetc(&f) == '-') {
/* yes */
while ((c = flogetc(&f)) != EOF) {
if (c == '-' &&
flogetc(&f) == '-' &&
flogetc(&f) == '>')
/* consumed whole
* comment */
break;
}
}
} else {
if (closing = (c == '/'))
c = flogetc(&f);
for (i = 0; i < tag->size; c = flogetc(&f)) {
if (tag->id[i++] != toupper(c))
break;
}
if ((i == tag->size) && !isalnum(c)) {
depth = depth + (closing ? -1 : 1);
if (depth == 0) {
while (c != EOF && c != '>') {
/* consume trailing gunk
* in close tag */
c = flogetc(&f);
}
if (!f.t)
return 0;
ret = f.t->next;
f.t->next = 0;
return ret;
}
}
}
}
}
return 0;
}
static Line *comment(Paragraph *p)
{
Line *t, *ret;
for (t = p->text; t; t = t->next) {
if (strstr(T(t->text), "-->")) {
ret = t->next;
t->next = 0;
return ret;
}
}
return t;
}
/* tables look like
* header|header{|header}
* ------|------{|......}
* {body lines}
*/
static int istable(Line *t)
{
char *p;
Line *dashes = t->next;
int contains = 0; /* found character bits; 0x01 is |, 0x02 is - */
/* two lines, first must contain | */
if (!(dashes && memchr(T(t->text), '|', S(t->text))))
return 0;
/* second line must contain - or | and nothing
* else except for whitespace or :
*/
for (p = T(dashes->text) + S(dashes->text) - 1; p >= T(dashes->text);
--p)
if (*p == '|')
contains |= 0x01;
else if (*p == '-')
contains |= 0x02;
else if (!((*p == ':') || isspace(*p)))
return 0;
return (contains & 0x03);
}
/* footnotes look like ^<whitespace>{0,3}[stuff]: <content>$
*/
static int isfootnote(Line *t)
{
int i;
if (((i = t->dle) > 3) || (T(t->text)[i] != '['))
return 0;
for (++i; i < S(t->text); ++i) {
if (T(t->text)[i] == '[')
return 0;
else if (T(t->text)[i] == ']')
return (T(t->text)[i + 1] == ':');
}
return 0;
}
static int isquote(Line *t)
{
int j;
for (j = 0; j < 4; j++)
if (T(t->text)[j] == '>')
return 1;
else if (!isspace(T(t->text)[j]))
return 0;
return 0;
}
static int dashchar(char c) { return (c == '*') || (c == '-') || (c == '_'); }
static int iscode(Line *t) { return (t->dle >= 4); }
static int ishr(Line *t)
{
int i, count = 0;
char dash = 0;
char c;
if (iscode(t))
return 0;
for (i = 0; i < S(t->text); i++) {
c = T(t->text)[i];
if ((dash == 0) && dashchar(c))
dash = c;
if (c == dash)
++count;
else if (!isspace(c))
return 0;
}
return (count >= 3);
}
static int ishdr(Line *t, int *htyp)
{
int i;
/* first check for etx-style ###HEADER###
*/
/* leading run of `#`'s ?
*/
for (i = 0; T(t->text)[i] == '#'; ++i)
;
/* ANY leading `#`'s make this into an ETX header
*/
if (i && (i < S(t->text) || i > 1)) {
*htyp = ETX;
return 1;
}
/* then check for setext-style HEADER
* ======
*/
if (t->next) {
char *q = T(t->next->text);
int last = S(t->next->text);
if ((*q == '=') || (*q == '-')) {
/* ignore trailing whitespace */
while ((last > 1) && isspace(q[last - 1]))
--last;
for (i = 1; i < last; i++)
if (q[0] != q[i])
return 0;
*htyp = SETEXT;
return 1;
}
}
return 0;
}
static int isdefinition(Line *t)
{
#if DL_TAG_EXTENSION
return t && t->next && (S(t->text) > 2) && (t->dle == 0) &&
(T(t->text)[0] == '=') && (T(t->text)[S(t->text) - 1] == '=') &&
((t->next->dle >= 4) || isdefinition(t->next));
#else
return 0;
#endif
}
static int islist(Line *t, int *trim)
{
int i, j;
char *q;
if (iscode(t) || blankline(t) || ishdr(t, &i) || ishr(t))
return 0;
if (isdefinition(t)) {
*trim = 4;
return DL;
}
if (strchr("*-+", T(t->text)[t->dle]) &&
isspace(T(t->text)[t->dle + 1])) {
i = nextnonblank(t, t->dle + 1);
*trim = (i > 4) ? 4 : i;
return UL;
}
if ((j = nextblank(t, t->dle)) > t->dle) {
if (T(t->text)[j - 1] == '.') {
#if ALPHA_LIST
if ((j == t->dle + 2) && isalpha(T(t->text)[t->dle])) {
j = nextnonblank(t, j);
*trim = j;
return AL;
}
#endif
strtoul(T(t->text) + t->dle, &q, 10);
if ((q > T(t->text) + t->dle) &&
(q == T(t->text) + (j - 1))) {
j = nextnonblank(t, j);
*trim = j;
return OL;
}
}
}
return 0;
}
static Line *headerblock(Paragraph *pp, int htyp)
{
Line *ret = 0;
Line *p = pp->text;
int i, j;
switch (htyp) {
case SETEXT:
/* p->text is header, p->next->text is -'s or ='s
*/
pp->hnumber = (T(p->next->text)[0] == '=') ? 1 : 2;
ret = p->next->next;
___mkd_freeLine(p->next);
p->next = 0;
break;
case ETX:
/* p->text is ###header###, so we need to trim off
* the leading and trailing `#`'s
*/
for (i = 0; (T(p->text)[i] == T(p->text)[0]) &&
(i < S(p->text) - 1) && (i < 6);
i++)
;
pp->hnumber = i;
while ((i < S(p->text)) && isspace(T(p->text)[i]))
++i;
CLIP(p->text, 0, i);
for (j = S(p->text); (j > 1) && (T(p->text)[j - 1] == '#'); --j)
;
while (j && isspace(T(p->text)[j - 1]))
--j;
S(p->text) = j;
ret = p->next;
p->next = 0;
break;
}
return ret;
}
static Line *codeblock(Paragraph *p)
{
Line *t = p->text, *r;
for (; t; t = r) {
CLIP(t->text, 0, 4);
t->dle = mkd_firstnonblank(t);
if (!((r = skipempty(t->next)) && iscode(r))) {
___mkd_freeLineRange(t, r);
t->next = 0;
return r;
}
}
return t;
}
static int centered(Line *first, Line *last)
{
if (first && last) {
int len = S(last->text);
if ((len > 2) && (strncmp(T(first->text), "->", 2) == 0) &&
(strncmp(T(last->text) + len - 2, "<-", 2) == 0)) {
CLIP(first->text, 0, 2);
S(last->text) -= 2;
return CENTER;
}
}
return 0;
}
static int endoftextblock(Line *t, int toplevelblock)
{
int z;
if (blankline(t) || isquote(t) || iscode(t) || ishdr(t, &z) || ishr(t))
return 1;
/* HORRIBLE STANDARDS KLUDGE: Toplevel paragraphs eat absorb adjacent
* list items, but sublevel blocks behave properly.
*/
return toplevelblock ? 0 : islist(t, &z);
}
static Line *textblock(Paragraph *p, int toplevel)
{
Line *t, *next;
for (t = p->text; t; t = next) {
if (((next = t->next) == 0) || endoftextblock(next, toplevel)) {
p->align = centered(p->text, t);
t->next = 0;
return next;
}
}
return t;
}
/* length of the id: or class: kind in a special div-not-quote block
*/
static int szmarkerclass(char *p)
{
if (strncasecmp(p, "id:", 3) == 0)
return 3;
if (strncasecmp(p, "class:", 6) == 0)
return 6;
return 0;
}
/*
* check if the first line of a quoted block is the special div-not-quote
* marker %[kind:]name%
*/
static int isdivmarker(Line *p, int start)
{
#if DIV_QUOTE
char *s = T(p->text);
int len = S(p->text);
int i;
if (!(len && s[start] == '%' && s[len - 1] == '%'))
return 0;
i = szmarkerclass(s + start + 1) + start;
len -= start + 1;
while (++i < len)
if (!isalnum(s[i]))
return 0;
return 1;
#else
return 0;
#endif
}
/*
* accumulate a blockquote.
*
* one sick horrible thing about blockquotes is that even though
* it just takes ^> to start a quote, following lines, if quoted,
* assume that the prefix is ``>''. This means that code needs
* to be indented *5* spaces from the leading '>', but *4* spaces
* from the start of the line. This does not appear to be
* documented in the reference implementation, but it's the
* way the markdown sample web form at Daring Fireball works.
*/
static Line *quoteblock(Paragraph *p)
{
Line *t, *q;
int qp;
for (t = p->text; t; t = q) {
if (isquote(t)) {
/* clip leading spaces */
for (qp = 0; T(t->text)[qp] != '>'; qp++)
/* assert: the first nonblank character on this line
* will be a >
*/;
/* clip '>' */
qp++;
/* clip next space, if any */
if (T(t->text)[qp] == ' ')
qp++;
CLIP(t->text, 0, qp);
t->dle = mkd_firstnonblank(t);
}
q = skipempty(t->next);
if ((q == 0) ||
((q != t->next) && (!isquote(q) || isdivmarker(q, 1)))) {
___mkd_freeLineRange(t, q);
t = q;
break;
}
}
if (isdivmarker(p->text, 0)) {
char *prefix = "class";
int i;
q = p->text;
p->text = p->text->next;
if ((i = szmarkerclass(1 + T(q->text))) == 3)
/* and this would be an "%id:" prefix */
prefix = "id";
if (p->ident = malloc(4 + strlen(prefix) + S(q->text)))
sprintf(p->ident, "%s=\"%.*s\"", prefix,
S(q->text) - (i + 2), T(q->text) + (i + 1));
___mkd_freeLine(q);
}
return t;
}
/*
* A table block starts with a table header (see istable()), and continues
* until EOF or a line that /doesn't/ contain a |.
*/
static Line *tableblock(Paragraph *p)
{
Line *t, *q;
for (t = p->text; t && (q = t->next); t = t->next) {
if (!memchr(T(q->text), '|', S(q->text))) {
t->next = 0;
return q;
}
}
return 0;
}
static Paragraph *Pp(ParagraphRoot *, Line *, int);
static Paragraph *compile(Line *, int, MMIOT *);
/*
* pull in a list block. A list block starts with a list marker and
* runs until the next list marker, the next non-indented paragraph,
* or EOF. You do not have to indent nonblank lines after the list
* marker, but multiple paragraphs need to start with a 4-space indent.
*/
static Line *listitem(Paragraph *p, int indent)
{
Line *t, *q;
int clip = indent;
int z;
for (t = p->text; t; t = q) {
CLIP(t->text, 0, clip);
t->dle = mkd_firstnonblank(t);
if ((q = skipempty(t->next)) == 0) {
___mkd_freeLineRange(t, q);
return 0;
}
/* after a blank line, the next block needs to start with a line
* that's indented 4(? -- reference implementation allows a 1
* character indent, but that has unfortunate side effects here)
* spaces, but after that the line doesn't need any indentation
*/
if (q != t->next) {
if (q->dle < indent) {
q = t->next;
t->next = 0;
return q;
}
/* indent as far as the initial line was indented. */
indent = clip;
}
if ((q->dle < indent) && (ishr(q) || islist(q, &z)) &&
!ishdr(q, &z)) {
q = t->next;
t->next = 0;
return q;
}
clip = (q->dle > indent) ? indent : q->dle;
}
return t;
}
static Line *listblock(Paragraph *top, int trim, MMIOT *f)
{
ParagraphRoot d = {0, 0};
Paragraph *p;
Line *q = top->text, *text, *label;
int isdl = (top->typ == DL), para = 0, ltype;
while ((text = q)) {
if (top->typ == DL) {
Line *lp;
for (lp = label = text; lp; lp = lp->next) {
text = lp->next;
CLIP(lp->text, 0, 1);
S(lp->text)--;
if (!isdefinition(lp->next))
lp->next = 0;
}
} else
label = 0;
p = Pp(&d, text, LISTITEM);
text = listitem(p, trim);
p->down = compile(p->text, 0, f);
p->text = label;
if (para && (top->typ != DL) && p->down)
p->down->align = PARA;
if (!(q = skipempty(text)) ||
((ltype = islist(q, &trim)) == 0) ||
(isdl != (ltype == DL)))
break;
if (para = (q != text)) {
Line anchor;
anchor.next = text;
___mkd_freeLineRange(&anchor, q);
}
if (para && (top->typ != DL) && p->down)
p->down->align = PARA;
}
top->text = 0;
top->down = T(d);
return text;
}
static int tgood(char c)
{
switch (c) {
case '\'':
case '"':
return c;
case '(':
return ')';
}
return 0;
}
/*
* add a new (image or link) footnote to the footnote table
*/
static Line *addfootnote(Line *p, MMIOT *f)
{
int j, i;
int c;
Line *np = p->next;
Footnote *foot = &EXPAND(*f->footnotes);
CREATE(foot->tag);
CREATE(foot->link);
CREATE(foot->title);
foot->height = foot->width = 0;
for (j = i = p->dle + 1; T(p->text)[j] != ']'; j++)
EXPAND(foot->tag) = T(p->text)[j];
EXPAND(foot->tag) = 0;
S(foot->tag)--;
j = nextnonblank(p, j + 2);
while ((j < S(p->text)) && !isspace(T(p->text)[j]))
EXPAND(foot->link) = T(p->text)[j++];
EXPAND(foot->link) = 0;
S(foot->link)--;
j = nextnonblank(p, j);
if (T(p->text)[j] == '=') {
sscanf(T(p->text) + j, "=%dx%d", &foot->width, &foot->height);
while ((j < S(p->text)) && !isspace(T(p->text)[j]))
++j;
j = nextnonblank(p, j);
}
if ((j >= S(p->text)) && np && np->dle && tgood(T(np->text)[np->dle])) {
___mkd_freeLine(p);
p = np;
np = p->next;
j = p->dle;
}
if ((c = tgood(T(p->text)[j]))) {
/* Try to take the rest of the line as a comment; read to
* EOL, then shrink the string back to before the final
* quote.
*/
++j; /* skip leading quote */
while (j < S(p->text))
EXPAND(foot->title) = T(p->text)[j++];
while (S(foot->title) &&
T(foot->title)[S(foot->title) - 1] != c)
--S(foot->title);
if (S(foot->title)) /* skip trailing quote */
--S(foot->title);
EXPAND(foot->title) = 0;
--S(foot->title);
}
___mkd_freeLine(p);
return np;
}
/*
* allocate a paragraph header, link it to the
* tail of the current document
*/
static Paragraph *Pp(ParagraphRoot *d, Line *ptr, int typ)
{
Paragraph *ret = calloc(sizeof *ret, 1);
ret->text = ptr;
ret->typ = typ;
return ATTACH(*d, ret);
}
static Line *consume(Line *ptr, int *eaten)
{
Line *next;
int blanks = 0;
for (; ptr && blankline(ptr); ptr = next, blanks++) {
next = ptr->next;
___mkd_freeLine(ptr);
}
if (ptr)
*eaten = blanks;
return ptr;
}
/*
* top-level compilation; break the document into
* style, html, and source blocks with footnote links
* weeded out.
*/
static Paragraph *compile_document(Line *ptr, MMIOT *f)
{
ParagraphRoot d = {0, 0};
ANCHOR(Line) source = {0, 0};
Paragraph *p = 0;
struct kw *tag;
int eaten;
while (ptr) {
if (!(f->flags & DENY_HTML) && (tag = isopentag(ptr))) {
/* If we encounter a html/style block, compile and save
* all
* of the cached source BEFORE processing the
* html/style.
*/
if (T(source)) {
E(source)->next = 0;
p = Pp(&d, 0, SOURCE);
p->down = compile(T(source), 1, f);
T(source) = E(source) = 0;
}
p = Pp(&d, ptr,
strcmp(tag->id, "STYLE") == 0 ? STYLE : HTML);
if (strcmp(tag->id, "!--") == 0)
ptr = comment(p);
else
ptr = htmlblock(p, tag);
} else if (isfootnote(ptr)) {
/* footnotes, like cats, sleep anywhere; pull them
* out of the input stream and file them away for
* later processing
*/
ptr = consume(addfootnote(ptr, f), &eaten);
} else {
/* source; cache it up to wait for eof or the
* next html/style block
*/
ATTACH(source, ptr);
ptr = ptr->next;
}
}
if (T(source)) {
/* if there's any cached source at EOF, compile
* it now.
*/
E(source)->next = 0;
p = Pp(&d, 0, SOURCE);
p->down = compile(T(source), 1, f);
}
return T(d);
}
/*
* break a collection of markdown input into
* blocks of lists, code, html, and text to
* be marked up.
*/
static Paragraph *compile(Line *ptr, int toplevel, MMIOT *f)
{
ParagraphRoot d = {0, 0};
Paragraph *p = 0;
Line *r;
int para = toplevel;
int blocks = 0;
int hdr_type, list_type, indent;
ptr = consume(ptr, ¶);
while (ptr) {
if (iscode(ptr)) {
p = Pp(&d, ptr, CODE);
if (f->flags & MKD_1_COMPAT) {
/* HORRIBLE STANDARDS KLUDGE: the first line of
* every block
* has trailing whitespace trimmed off.
*/
___mkd_tidy(&p->text->text);
}
ptr = codeblock(p);
} else if (ishr(ptr)) {
p = Pp(&d, 0, HR);
r = ptr;
ptr = ptr->next;
___mkd_freeLine(r);
} else if ((list_type = islist(ptr, &indent))) {
p = Pp(&d, ptr, list_type);
ptr = listblock(p, indent, f);
} else if (isquote(ptr)) {
p = Pp(&d, ptr, QUOTE);
ptr = quoteblock(p);
p->down = compile(p->text, 1, f);
p->text = 0;
} else if (ishdr(ptr, &hdr_type)) {
p = Pp(&d, ptr, HDR);
ptr = headerblock(p, hdr_type);
} else if (istable(ptr) && !(f->flags & (STRICT | NOTABLES))) {
p = Pp(&d, ptr, TABLE);
ptr = tableblock(p);
} else {
p = Pp(&d, ptr, MARKUP);
ptr = textblock(p, toplevel);
}
if ((para || toplevel) && !p->align)
p->align = PARA;
blocks++;
para = toplevel || (blocks > 1);
ptr = consume(ptr, ¶);
if (para && !p->align)
p->align = PARA;
}
return T(d);
}
static void initialize()
{
static int first = 1;
if (first-- > 0) {
first = 0;
INITRNG(time(0));
qsort(blocktags, SZTAGS, sizeof blocktags[0], (stfu)casort);
}
}
/*
* the guts of the markdown() function, ripped out so I can do
* debugging.
*/
/*
* prepare and compile `text`, returning a Paragraph tree.
*/
int mkd_compile(Document *doc, int flags)
{
if (!doc)
return 0;
if (doc->compiled)
return 1;
doc->compiled = 1;
memset(doc->ctx, 0, sizeof(MMIOT));
doc->ctx->cb = &(doc->cb);
doc->ctx->flags = flags & USER_FLAGS;
CREATE(doc->ctx->in);
doc->ctx->footnotes = malloc(sizeof doc->ctx->footnotes[0]);
CREATE(*doc->ctx->footnotes);
initialize();
doc->code = compile_document(T(doc->content), doc->ctx);
qsort(T(*doc->ctx->footnotes), S(*doc->ctx->footnotes),
sizeof T(*doc->ctx->footnotes)[0], (stfu)__mkd_footsort);
memset(&doc->content, 0, sizeof doc->content);
return 1;
}
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