#include "hoedown/document.h"
#include <assert.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include "hoedown/stack.h"
#ifndef _MSC_VER
#include <strings.h>
#else
#define strncasecmp _strnicmp
#endif
#define REF_TABLE_SIZE 8
#define BUFFER_BLOCK 0
#define BUFFER_SPAN 1
#define HOEDOWN_LI_END 8 /* internal list flag */
const char *hoedown_find_block_tag(const char *str, unsigned int len);
/***************
* LOCAL TYPES *
***************/
/* link_ref: reference to a link */
struct link_ref {
unsigned int id;
hoedown_buffer *link;
hoedown_buffer *title;
struct link_ref *next;
};
/* footnote_ref: reference to a footnote */
struct footnote_ref {
unsigned int id;
int is_used;
unsigned int num;
hoedown_buffer *contents;
};
/* footnote_item: an item in a footnote_list */
struct footnote_item {
struct footnote_ref *ref;
struct footnote_item *next;
};
/* footnote_list: linked list of footnote_item */
struct footnote_list {
unsigned int count;
struct footnote_item *head;
struct footnote_item *tail;
};
/* char_trigger: function pointer to render active chars */
/* returns the number of chars taken care of */
/* data is the pointer of the beginning of the span */
/* offset is the number of valid chars before data */
typedef size_t
(*char_trigger)(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size);
static size_t char_emphasis(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size);
static size_t char_quote(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size);
static size_t char_linebreak(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size);
static size_t char_codespan(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size);
static size_t char_escape(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size);
static size_t char_entity(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size);
static size_t char_langle_tag(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size);
static size_t char_autolink_url(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size);
static size_t char_autolink_email(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size);
static size_t char_autolink_www(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size);
static size_t char_link(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size);
static size_t char_superscript(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size);
static size_t char_math(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size);
enum markdown_char_t {
MD_CHAR_NONE = 0,
MD_CHAR_EMPHASIS,
MD_CHAR_CODESPAN,
MD_CHAR_LINEBREAK,
MD_CHAR_LINK,
MD_CHAR_LANGLE,
MD_CHAR_ESCAPE,
MD_CHAR_ENTITY,
MD_CHAR_AUTOLINK_URL,
MD_CHAR_AUTOLINK_EMAIL,
MD_CHAR_AUTOLINK_WWW,
MD_CHAR_SUPERSCRIPT,
MD_CHAR_QUOTE,
MD_CHAR_MATH
};
static char_trigger markdown_char_ptrs[] = {
NULL,
&char_emphasis,
&char_codespan,
&char_linebreak,
&char_link,
&char_langle_tag,
&char_escape,
&char_entity,
&char_autolink_url,
&char_autolink_email,
&char_autolink_www,
&char_superscript,
&char_quote,
&char_math
};
struct hoedown_document {
hoedown_renderer md;
hoedown_renderer_data data;
struct link_ref *refs[REF_TABLE_SIZE];
struct footnote_list footnotes_found;
struct footnote_list footnotes_used;
uint8_t active_char[256];
hoedown_stack work_bufs[2];
hoedown_extensions ext_flags;
size_t max_nesting;
int in_link_body;
};
/***************************
* HELPER FUNCTIONS *
***************************/
static hoedown_buffer *
newbuf(hoedown_document *doc, int type)
{
static const size_t buf_size[2] = {256, 64};
hoedown_buffer *work = NULL;
hoedown_stack *pool = &doc->work_bufs[type];
if (pool->size < pool->asize &&
pool->item[pool->size] != NULL) {
work = pool->item[pool->size++];
work->size = 0;
} else {
work = hoedown_buffer_new(buf_size[type]);
hoedown_stack_push(pool, work);
}
return work;
}
static void
popbuf(hoedown_document *doc, int type)
{
doc->work_bufs[type].size--;
}
static void
unscape_text(hoedown_buffer *ob, hoedown_buffer *src)
{
size_t i = 0, org;
while (i < src->size) {
org = i;
while (i < src->size && src->data[i] != '\\')
i++;
if (i > org)
hoedown_buffer_put(ob, src->data + org, i - org);
if (i + 1 >= src->size)
break;
hoedown_buffer_putc(ob, src->data[i + 1]);
i += 2;
}
}
static unsigned int
hash_link_ref(const uint8_t *link_ref, size_t length)
{
size_t i;
unsigned int hash = 0;
for (i = 0; i < length; ++i)
hash = tolower(link_ref[i]) + (hash << 6) + (hash << 16) - hash;
return hash;
}
static struct link_ref *
add_link_ref(
struct link_ref **references,
const uint8_t *name, size_t name_size)
{
struct link_ref *ref = hoedown_calloc(1, sizeof(struct link_ref));
ref->id = hash_link_ref(name, name_size);
ref->next = references[ref->id % REF_TABLE_SIZE];
references[ref->id % REF_TABLE_SIZE] = ref;
return ref;
}
static struct link_ref *
find_link_ref(struct link_ref **references, uint8_t *name, size_t length)
{
unsigned int hash = hash_link_ref(name, length);
struct link_ref *ref = NULL;
ref = references[hash % REF_TABLE_SIZE];
while (ref != NULL) {
if (ref->id == hash)
return ref;
ref = ref->next;
}
return NULL;
}
static void
free_link_refs(struct link_ref **references)
{
size_t i;
for (i = 0; i < REF_TABLE_SIZE; ++i) {
struct link_ref *r = references[i];
struct link_ref *next;
while (r) {
next = r->next;
hoedown_buffer_free(r->link);
hoedown_buffer_free(r->title);
free(r);
r = next;
}
}
}
static struct footnote_ref *
create_footnote_ref(struct footnote_list *list, const uint8_t *name, size_t name_size)
{
struct footnote_ref *ref = hoedown_calloc(1, sizeof(struct footnote_ref));
ref->id = hash_link_ref(name, name_size);
return ref;
}
static int
add_footnote_ref(struct footnote_list *list, struct footnote_ref *ref)
{
struct footnote_item *item = hoedown_calloc(1, sizeof(struct footnote_item));
if (!item)
return 0;
item->ref = ref;
if (list->head == NULL) {
list->head = list->tail = item;
} else {
list->tail->next = item;
list->tail = item;
}
list->count++;
return 1;
}
static struct footnote_ref *
find_footnote_ref(struct footnote_list *list, uint8_t *name, size_t length)
{
unsigned int hash = hash_link_ref(name, length);
struct footnote_item *item = NULL;
item = list->head;
while (item != NULL) {
if (item->ref->id == hash)
return item->ref;
item = item->next;
}
return NULL;
}
static void
free_footnote_ref(struct footnote_ref *ref)
{
hoedown_buffer_free(ref->contents);
free(ref);
}
static void
free_footnote_list(struct footnote_list *list, int free_refs)
{
struct footnote_item *item = list->head;
struct footnote_item *next;
while (item) {
next = item->next;
if (free_refs)
free_footnote_ref(item->ref);
free(item);
item = next;
}
}
/*
* Check whether a char is a Markdown spacing char.
* Right now we only consider spaces the actual
* space and a newline: tabs and carriage returns
* are filtered out during the preprocessing phase.
*
* If we wanted to actually be UTF-8 compliant, we
* should instead extract an Unicode codepoint from
* this character and check for space properties.
*/
static int
_isspace(int c)
{
return c == ' ' || c == '\n';
}
/* is_empty_all: verify that all the data is spacing */
static int
is_empty_all(const uint8_t *data, size_t size)
{
size_t i = 0;
while (i < size && _isspace(data[i])) i++;
return i == size;
}
/*
* Replace all spacing characters in data with spaces. As a special
* case, this collapses a newline with the previous space, if possible.
*/
static void
replace_spacing(hoedown_buffer *ob, const uint8_t *data, size_t size)
{
size_t i = 0, mark;
hoedown_buffer_grow(ob, size);
while (1) {
mark = i;
while (i < size && data[i] != '\n') i++;
hoedown_buffer_put(ob, data + mark, i - mark);
if (i >= size) break;
if (!(i > 0 && data[i-1] == ' '))
hoedown_buffer_putc(ob, ' ');
i++;
}
}
/****************************
* INLINE PARSING FUNCTIONS *
****************************/
/* is_mail_autolink • looks for the address part of a mail autolink and '>' */
/* this is less strict than the original markdown e-mail address matching */
static size_t
is_mail_autolink(uint8_t *data, size_t size)
{
size_t i = 0, nb = 0;
/* address is assumed to be: [-@._a-zA-Z0-9]+ with exactly one '@' */
for (i = 0; i < size; ++i) {
if (isalnum(data[i]))
continue;
switch (data[i]) {
case '@':
nb++;
case '-':
case '.':
case '_':
break;
case '>':
return (nb == 1) ? i + 1 : 0;
default:
return 0;
}
}
return 0;
}
/* tag_length • returns the length of the given tag, or 0 is it's not valid */
static size_t
tag_length(uint8_t *data, size_t size, hoedown_autolink_type *autolink)
{
size_t i, j;
/* a valid tag can't be shorter than 3 chars */
if (size < 3) return 0;
/* begins with a '<' optionally followed by '/', followed by letter or number */
if (data[0] != '<') return 0;
i = (data[1] == '/') ? 2 : 1;
if (!isalnum(data[i]))
return 0;
/* scheme test */
*autolink = HOEDOWN_AUTOLINK_NONE;
/* try to find the beginning of an URI */
while (i < size && (isalnum(data[i]) || data[i] == '.' || data[i] == '+' || data[i] == '-'))
i++;
if (i > 1 && data[i] == '@') {
if ((j = is_mail_autolink(data + i, size - i)) != 0) {
*autolink = HOEDOWN_AUTOLINK_EMAIL;
return i + j;
}
}
if (i > 2 && data[i] == ':') {
*autolink = HOEDOWN_AUTOLINK_NORMAL;
i++;
}
/* completing autolink test: no spacing or ' or " */
if (i >= size)
*autolink = HOEDOWN_AUTOLINK_NONE;
else if (*autolink) {
j = i;
while (i < size) {
if (data[i] == '\\') i += 2;
else if (data[i] == '>' || data[i] == '\'' ||
data[i] == '"' || data[i] == ' ' || data[i] == '\n')
break;
else i++;
}
if (i >= size) return 0;
if (i > j && data[i] == '>') return i + 1;
/* one of the forbidden chars has been found */
*autolink = HOEDOWN_AUTOLINK_NONE;
}
/* looking for something looking like a tag end */
while (i < size && data[i] != '>') i++;
if (i >= size) return 0;
return i + 1;
}
/* parse_inline • parses inline markdown elements */
static void
parse_inline(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t size)
{
size_t i = 0, end = 0, consumed = 0;
hoedown_buffer work = { 0, 0, 0, 0, NULL, NULL, NULL };
uint8_t *active_char = doc->active_char;
if (doc->work_bufs[BUFFER_SPAN].size +
doc->work_bufs[BUFFER_BLOCK].size > doc->max_nesting)
return;
while (i < size) {
/* copying inactive chars into the output */
while (end < size && active_char[data[end]] == 0)
end++;
if (doc->md.normal_text) {
work.data = data + i;
work.size = end - i;
doc->md.normal_text(ob, &work, &doc->data);
}
else
hoedown_buffer_put(ob, data + i, end - i);
if (end >= size) break;
i = end;
end = markdown_char_ptrs[ (int)active_char[data[end]] ](ob, doc, data + i, i - consumed, size - i);
if (!end) /* no action from the callback */
end = i + 1;
else {
i += end;
end = i;
consumed = i;
}
}
}
/* is_escaped • returns whether special char at data[loc] is escaped by '\\' */
static int
is_escaped(uint8_t *data, size_t loc)
{
size_t i = loc;
while (i >= 1 && data[i - 1] == '\\')
i--;
/* odd numbers of backslashes escapes data[loc] */
return (loc - i) % 2;
}
/* find_emph_char • looks for the next emph uint8_t, skipping other constructs */
static size_t
find_emph_char(uint8_t *data, size_t size, uint8_t c)
{
size_t i = 0;
while (i < size) {
while (i < size && data[i] != c && data[i] != '[' && data[i] != '`')
i++;
if (i == size)
return 0;
/* not counting escaped chars */
if (is_escaped(data, i)) {
i++; continue;
}
if (data[i] == c)
return i;
/* skipping a codespan */
if (data[i] == '`') {
size_t span_nb = 0, bt;
size_t tmp_i = 0;
/* counting the number of opening backticks */
while (i < size && data[i] == '`') {
i++; span_nb++;
}
if (i >= size) return 0;
/* finding the matching closing sequence */
bt = 0;
while (i < size && bt < span_nb) {
if (!tmp_i && data[i] == c) tmp_i = i;
if (data[i] == '`') bt++;
else bt = 0;
i++;
}
/* not a well-formed codespan; use found matching emph char */
if (i >= size) return tmp_i;
}
/* skipping a link */
else if (data[i] == '[') {
size_t tmp_i = 0;
uint8_t cc;
i++;
while (i < size && data[i] != ']') {
if (!tmp_i && data[i] == c) tmp_i = i;
i++;
}
i++;
while (i < size && _isspace(data[i]))
i++;
if (i >= size)
return tmp_i;
switch (data[i]) {
case '[':
cc = ']'; break;
case '(':
cc = ')'; break;
default:
if (tmp_i)
return tmp_i;
else
continue;
}
i++;
while (i < size && data[i] != cc) {
if (!tmp_i && data[i] == c) tmp_i = i;
i++;
}
if (i >= size)
return tmp_i;
i++;
}
}
return 0;
}
/* parse_emph1 • parsing single emphase */
/* closed by a symbol not preceded by spacing and not followed by symbol */
static size_t
parse_emph1(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t size, uint8_t c)
{
size_t i = 0, len;
hoedown_buffer *work = 0;
int r;
/* skipping one symbol if coming from emph3 */
if (size > 1 && data[0] == c && data[1] == c) i = 1;
while (i < size) {
len = find_emph_char(data + i, size - i, c);
if (!len) return 0;
i += len;
if (i >= size) return 0;
if (data[i] == c && !_isspace(data[i - 1])) {
if (doc->ext_flags & HOEDOWN_EXT_NO_INTRA_EMPHASIS) {
if (i + 1 < size && isalnum(data[i + 1]))
continue;
}
work = newbuf(doc, BUFFER_SPAN);
parse_inline(work, doc, data, i);
if (doc->ext_flags & HOEDOWN_EXT_UNDERLINE && c == '_')
r = doc->md.underline(ob, work, &doc->data);
else
r = doc->md.emphasis(ob, work, &doc->data);
popbuf(doc, BUFFER_SPAN);
return r ? i + 1 : 0;
}
}
return 0;
}
/* parse_emph2 • parsing single emphase */
static size_t
parse_emph2(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t size, uint8_t c)
{
size_t i = 0, len;
hoedown_buffer *work = 0;
int r;
while (i < size) {
len = find_emph_char(data + i, size - i, c);
if (!len) return 0;
i += len;
if (i + 1 < size && data[i] == c && data[i + 1] == c && i && !_isspace(data[i - 1])) {
work = newbuf(doc, BUFFER_SPAN);
parse_inline(work, doc, data, i);
if (c == '~')
r = doc->md.strikethrough(ob, work, &doc->data);
else if (c == '=')
r = doc->md.highlight(ob, work, &doc->data);
else
r = doc->md.double_emphasis(ob, work, &doc->data);
popbuf(doc, BUFFER_SPAN);
return r ? i + 2 : 0;
}
i++;
}
return 0;
}
/* parse_emph3 • parsing single emphase */
/* finds the first closing tag, and delegates to the other emph */
static size_t
parse_emph3(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t size, uint8_t c)
{
size_t i = 0, len;
int r;
while (i < size) {
len = find_emph_char(data + i, size - i, c);
if (!len) return 0;
i += len;
/* skip spacing preceded symbols */
if (data[i] != c || _isspace(data[i - 1]))
continue;
if (i + 2 < size && data[i + 1] == c && data[i + 2] == c && doc->md.triple_emphasis) {
/* triple symbol found */
hoedown_buffer *work = newbuf(doc, BUFFER_SPAN);
parse_inline(work, doc, data, i);
r = doc->md.triple_emphasis(ob, work, &doc->data);
popbuf(doc, BUFFER_SPAN);
return r ? i + 3 : 0;
} else if (i + 1 < size && data[i + 1] == c) {
/* double symbol found, handing over to emph1 */
len = parse_emph1(ob, doc, data - 2, size + 2, c);
if (!len) return 0;
else return len - 2;
} else {
/* single symbol found, handing over to emph2 */
len = parse_emph2(ob, doc, data - 1, size + 1, c);
if (!len) return 0;
else return len - 1;
}
}
return 0;
}
/* parse_math • parses a math span until the given ending delimiter */
static size_t
parse_math(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size, const char *end, size_t delimsz, int displaymode)
{
hoedown_buffer text = { NULL, 0, 0, 0, NULL, NULL, NULL };
size_t i = delimsz;
if (!doc->md.math)
return 0;
/* find ending delimiter */
while (1) {
while (i < size && data[i] != (uint8_t)end[0])
i++;
if (i >= size)
return 0;
if (!is_escaped(data, i) && !(i + delimsz > size)
&& memcmp(data + i, end, delimsz) == 0)
break;
i++;
}
/* prepare buffers */
text.data = data + delimsz;
text.size = i - delimsz;
/* if this is a $$ and MATH_EXPLICIT is not active,
* guess whether displaymode should be enabled from the context */
i += delimsz;
if (delimsz == 2 && !(doc->ext_flags & HOEDOWN_EXT_MATH_EXPLICIT))
displaymode = is_empty_all(data - offset, offset) && is_empty_all(data + i, size - i);
/* call callback */
if (doc->md.math(ob, &text, displaymode, &doc->data))
return i;
return 0;
}
/* char_emphasis • single and double emphasis parsing */
static size_t
char_emphasis(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size)
{
uint8_t c = data[0];
size_t ret;
if (doc->ext_flags & HOEDOWN_EXT_NO_INTRA_EMPHASIS) {
if (offset > 0 && !_isspace(data[-1]) && data[-1] != '>' && data[-1] != '(')
return 0;
}
if (size > 2 && data[1] != c) {
/* spacing cannot follow an opening emphasis;
* strikethrough and highlight only takes two characters '~~' */
if (c == '~' || c == '=' || _isspace(data[1]) || (ret = parse_emph1(ob, doc, data + 1, size - 1, c)) == 0)
return 0;
return ret + 1;
}
if (size > 3 && data[1] == c && data[2] != c) {
if (_isspace(data[2]) || (ret = parse_emph2(ob, doc, data + 2, size - 2, c)) == 0)
return 0;
return ret + 2;
}
if (size > 4 && data[1] == c && data[2] == c && data[3] != c) {
if (c == '~' || c == '=' || _isspace(data[3]) || (ret = parse_emph3(ob, doc, data + 3, size - 3, c)) == 0)
return 0;
return ret + 3;
}
return 0;
}
/* char_linebreak • '\n' preceded by two spaces (assuming linebreak != 0) */
static size_t
char_linebreak(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size)
{
if (offset < 2 || data[-1] != ' ' || data[-2] != ' ')
return 0;
/* removing the last space from ob and rendering */
while (ob->size && ob->data[ob->size - 1] == ' ')
ob->size--;
return doc->md.linebreak(ob, &doc->data) ? 1 : 0;
}
/* char_codespan • '`' parsing a code span (assuming codespan != 0) */
static size_t
char_codespan(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size)
{
hoedown_buffer work = { NULL, 0, 0, 0, NULL, NULL, NULL };
size_t end, nb = 0, i, f_begin, f_end;
/* counting the number of backticks in the delimiter */
while (nb < size && data[nb] == '`')
nb++;
/* finding the next delimiter */
i = 0;
for (end = nb; end < size && i < nb; end++) {
if (data[end] == '`') i++;
else i = 0;
}
if (i < nb && end >= size)
return 0; /* no matching delimiter */
/* trimming outside spaces */
f_begin = nb;
while (f_begin < end && data[f_begin] == ' ')
f_begin++;
f_end = end - nb;
while (f_end > nb && data[f_end-1] == ' ')
f_end--;
/* real code span */
if (f_begin < f_end) {
work.data = data + f_begin;
work.size = f_end - f_begin;
if (!doc->md.codespan(ob, &work, &doc->data))
end = 0;
} else {
if (!doc->md.codespan(ob, 0, &doc->data))
end = 0;
}
return end;
}
/* char_quote • '"' parsing a quote */
static size_t
char_quote(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size)
{
size_t end, nq = 0, i, f_begin, f_end;
/* counting the number of quotes in the delimiter */
while (nq < size && data[nq] == '"')
nq++;
/* finding the next delimiter */
end = nq;
while (1) {
i = end;
end += find_emph_char(data + end, size - end, '"');
if (end == i) return 0; /* no matching delimiter */
i = end;
while (end < size && data[end] == '"' && end - i < nq) end++;
if (end - i >= nq) break;
}
/* trimming outside spaces */
f_begin = nq;
while (f_begin < end && data[f_begin] == ' ')
f_begin++;
f_end = end - nq;
while (f_end > nq && data[f_end-1] == ' ')
f_end--;
/* real quote */
if (f_begin < f_end) {
hoedown_buffer *work = newbuf(doc, BUFFER_SPAN);
parse_inline(work, doc, data + f_begin, f_end - f_begin);
if (!doc->md.quote(ob, work, &doc->data))
end = 0;
popbuf(doc, BUFFER_SPAN);
} else {
if (!doc->md.quote(ob, 0, &doc->data))
end = 0;
}
return end;
}
/* char_escape • '\\' backslash escape */
static size_t
char_escape(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size)
{
static const char *escape_chars = "\\`*_{}[]()#+-.!:|&<>^~=\"$";
hoedown_buffer work = { 0, 0, 0, 0, NULL, NULL, NULL };
size_t w;
if (size > 1) {
if (data[1] == '\\' && (doc->ext_flags & HOEDOWN_EXT_MATH) &&
size > 2 && (data[2] == '(' || data[2] == '[')) {
const char *end = (data[2] == '[') ? "\\\\]" : "\\\\)";
w = parse_math(ob, doc, data, offset, size, end, 3, data[2] == '[');
if (w) return w;
}
if (strchr(escape_chars, data[1]) == NULL)
return 0;
if (doc->md.normal_text) {
work.data = data + 1;
work.size = 1;
doc->md.normal_text(ob, &work, &doc->data);
}
else hoedown_buffer_putc(ob, data[1]);
} else if (size == 1) {
hoedown_buffer_putc(ob, data[0]);
}
return 2;
}
/* char_entity • '&' escaped when it doesn't belong to an entity */
/* valid entities are assumed to be anything matching &#?[A-Za-z0-9]+; */
static size_t
char_entity(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size)
{
size_t end = 1;
hoedown_buffer work = { 0, 0, 0, 0, NULL, NULL, NULL };
if (end < size && data[end] == '#')
end++;
while (end < size && isalnum(data[end]))
end++;
if (end < size && data[end] == ';')
end++; /* real entity */
else
return 0; /* lone '&' */
if (doc->md.entity) {
work.data = data;
work.size = end;
doc->md.entity(ob, &work, &doc->data);
}
else hoedown_buffer_put(ob, data, end);
return end;
}
/* char_langle_tag • '<' when tags or autolinks are allowed */
static size_t
char_langle_tag(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size)
{
hoedown_buffer work = { NULL, 0, 0, 0, NULL, NULL, NULL };
hoedown_autolink_type altype = HOEDOWN_AUTOLINK_NONE;
size_t end = tag_length(data, size, &altype);
int ret = 0;
work.data = data;
work.size = end;
if (end > 2) {
if (doc->md.autolink && altype != HOEDOWN_AUTOLINK_NONE) {
hoedown_buffer *u_link = newbuf(doc, BUFFER_SPAN);
work.data = data + 1;
work.size = end - 2;
unscape_text(u_link, &work);
ret = doc->md.autolink(ob, u_link, altype, &doc->data);
popbuf(doc, BUFFER_SPAN);
}
else if (doc->md.raw_html)
ret = doc->md.raw_html(ob, &work, &doc->data);
}
if (!ret) return 0;
else return end;
}
static size_t
char_autolink_www(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size)
{
hoedown_buffer *link, *link_url, *link_text;
size_t link_len, rewind;
if (!doc->md.link || doc->in_link_body)
return 0;
link = newbuf(doc, BUFFER_SPAN);
if ((link_len = hoedown_autolink__www(&rewind, link, data, offset, size, HOEDOWN_AUTOLINK_SHORT_DOMAINS)) > 0) {
link_url = newbuf(doc, BUFFER_SPAN);
HOEDOWN_BUFPUTSL(link_url, "http://");
hoedown_buffer_put(link_url, link->data, link->size);
ob->size -= rewind;
if (doc->md.normal_text) {
link_text = newbuf(doc, BUFFER_SPAN);
doc->md.normal_text(link_text, link, &doc->data);
doc->md.link(ob, link_text, link_url, NULL, &doc->data);
popbuf(doc, BUFFER_SPAN);
} else {
doc->md.link(ob, link, link_url, NULL, &doc->data);
}
popbuf(doc, BUFFER_SPAN);
}
popbuf(doc, BUFFER_SPAN);
return link_len;
}
static size_t
char_autolink_email(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size)
{
hoedown_buffer *link;
size_t link_len, rewind;
if (!doc->md.autolink || doc->in_link_body)
return 0;
link = newbuf(doc, BUFFER_SPAN);
if ((link_len = hoedown_autolink__email(&rewind, link, data, offset, size, 0)) > 0) {
ob->size -= rewind;
doc->md.autolink(ob, link, HOEDOWN_AUTOLINK_EMAIL, &doc->data);
}
popbuf(doc, BUFFER_SPAN);
return link_len;
}
static size_t
char_autolink_url(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size)
{
hoedown_buffer *link;
size_t link_len, rewind;
if (!doc->md.autolink || doc->in_link_body)
return 0;
link = newbuf(doc, BUFFER_SPAN);
if ((link_len = hoedown_autolink__url(&rewind, link, data, offset, size, 0)) > 0) {
ob->size -= rewind;
doc->md.autolink(ob, link, HOEDOWN_AUTOLINK_NORMAL, &doc->data);
}
popbuf(doc, BUFFER_SPAN);
return link_len;
}
/* char_link • '[': parsing a link, a footnote or an image */
static size_t
char_link(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size)
{
int is_img = (offset && data[-1] == '!' && !is_escaped(data - offset, offset - 1));
int is_footnote = (doc->ext_flags & HOEDOWN_EXT_FOOTNOTES && data[1] == '^');
size_t i = 1, txt_e, link_b = 0, link_e = 0, title_b = 0, title_e = 0;
hoedown_buffer *content = NULL;
hoedown_buffer *link = NULL;
hoedown_buffer *title = NULL;
hoedown_buffer *u_link = NULL;
size_t org_work_size = doc->work_bufs[BUFFER_SPAN].size;
int ret = 0, in_title = 0, qtype = 0;
/* checking whether the correct renderer exists */
if ((is_footnote && !doc->md.footnote_ref) || (is_img && !doc->md.image)
|| (!is_img && !is_footnote && !doc->md.link))
goto cleanup;
/* looking for the matching closing bracket */
i += find_emph_char(data + i, size - i, ']');
txt_e = i;
if (i < size && data[i] == ']') i++;
else goto cleanup;
/* footnote link */
if (is_footnote) {
hoedown_buffer id = { NULL, 0, 0, 0, NULL, NULL, NULL };
struct footnote_ref *fr;
if (txt_e < 3)
goto cleanup;
id.data = data + 2;
id.size = txt_e - 2;
fr = find_footnote_ref(&doc->footnotes_found, id.data, id.size);
/* mark footnote used */
if (fr && !fr->is_used) {
if(!add_footnote_ref(&doc->footnotes_used, fr))
goto cleanup;
fr->is_used = 1;
fr->num = doc->footnotes_used.count;
/* render */
if (doc->md.footnote_ref)
ret = doc->md.footnote_ref(ob, fr->num, &doc->data);
}
goto cleanup;
}
/* skip any amount of spacing */
/* (this is much more laxist than original markdown syntax) */
while (i < size && _isspace(data[i]))
i++;
/* inline style link */
if (i < size && data[i] == '(') {
size_t nb_p;
/* skipping initial spacing */
i++;
while (i < size && _isspace(data[i]))
i++;
link_b = i;
/* looking for link end: ' " ) */
/* Count the number of open parenthesis */
nb_p = 0;
while (i < size) {
if (data[i] == '\\') i += 2;
else if (data[i] == '(' && i != 0) {
nb_p++; i++;
}
else if (data[i] == ')') {
if (nb_p == 0) break;
else nb_p--; i++;
} else if (i >= 1 && _isspace(data[i-1]) && (data[i] == '\'' || data[i] == '"')) break;
else i++;
}
if (i >= size) goto cleanup;
link_e = i;
/* looking for title end if present */
if (data[i] == '\'' || data[i] == '"') {
qtype = data[i];
in_title = 1;
i++;
title_b = i;
while (i < size) {
if (data[i] == '\\') i += 2;
else if (data[i] == qtype) {in_title = 0; i++;}
else if ((data[i] == ')') && !in_title) break;
else i++;
}
if (i >= size) goto cleanup;
/* skipping spacing after title */
title_e = i - 1;
while (title_e > title_b && _isspace(data[title_e]))
title_e--;
/* checking for closing quote presence */
if (data[title_e] != '\'' && data[title_e] != '"') {
title_b = title_e = 0;
link_e = i;
}
}
/* remove spacing at the end of the link */
while (link_e > link_b && _isspace(data[link_e - 1]))
link_e--;
/* remove optional angle brackets around the link */
if (data[link_b] == '<') link_b++;
if (data[link_e - 1] == '>') link_e--;
/* building escaped link and title */
if (link_e > link_b) {
link = newbuf(doc, BUFFER_SPAN);
hoedown_buffer_put(link, data + link_b, link_e - link_b);
}
if (title_e > title_b) {
title = newbuf(doc, BUFFER_SPAN);
hoedown_buffer_put(title, data + title_b, title_e - title_b);
}
i++;
}
/* reference style link */
else if (i < size && data[i] == '[') {
hoedown_buffer *id = newbuf(doc, BUFFER_SPAN);
struct link_ref *lr;
/* looking for the id */
i++;
link_b = i;
while (i < size && data[i] != ']') i++;
if (i >= size) goto cleanup;
link_e = i;
/* finding the link_ref */
if (link_b == link_e)
replace_spacing(id, data + 1, txt_e - 1);
else
hoedown_buffer_put(id, data + link_b, link_e - link_b);
lr = find_link_ref(doc->refs, id->data, id->size);
if (!lr)
goto cleanup;
/* keeping link and title from link_ref */
link = lr->link;
title = lr->title;
i++;
}
/* shortcut reference style link */
else {
hoedown_buffer *id = newbuf(doc, BUFFER_SPAN);
struct link_ref *lr;
/* crafting the id */
replace_spacing(id, data + 1, txt_e - 1);
/* finding the link_ref */
lr = find_link_ref(doc->refs, id->data, id->size);
if (!lr)
goto cleanup;
/* keeping link and title from link_ref */
link = lr->link;
title = lr->title;
/* rewinding the spacing */
i = txt_e + 1;
}
/* building content: img alt is kept, only link content is parsed */
if (txt_e > 1) {
content = newbuf(doc, BUFFER_SPAN);
if (is_img) {
hoedown_buffer_put(content, data + 1, txt_e - 1);
} else {
/* disable autolinking when parsing inline the
* content of a link */
doc->in_link_body = 1;
parse_inline(content, doc, data + 1, txt_e - 1);
doc->in_link_body = 0;
}
}
if (link) {
u_link = newbuf(doc, BUFFER_SPAN);
unscape_text(u_link, link);
}
/* calling the relevant rendering function */
if (is_img) {
if (ob->size && ob->data[ob->size - 1] == '!')
ob->size -= 1;
ret = doc->md.image(ob, u_link, title, content, &doc->data);
} else {
ret = doc->md.link(ob, content, u_link, title, &doc->data);
}
/* cleanup */
cleanup:
doc->work_bufs[BUFFER_SPAN].size = (int)org_work_size;
return ret ? i : 0;
}
static size_t
char_superscript(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size)
{
size_t sup_start, sup_len;
hoedown_buffer *sup;
if (!doc->md.superscript)
return 0;
if (size < 2)
return 0;
if (data[1] == '(') {
sup_start = 2;
sup_len = find_emph_char(data + 2, size - 2, ')') + 2;
if (sup_len == size)
return 0;
} else {
sup_start = sup_len = 1;
while (sup_len < size && !_isspace(data[sup_len]))
sup_len++;
}
if (sup_len - sup_start == 0)
return (sup_start == 2) ? 3 : 0;
sup = newbuf(doc, BUFFER_SPAN);
parse_inline(sup, doc, data + sup_start, sup_len - sup_start);
doc->md.superscript(ob, sup, &doc->data);
popbuf(doc, BUFFER_SPAN);
return (sup_start == 2) ? sup_len + 1 : sup_len;
}
static size_t
char_math(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t offset, size_t size)
{
/* double dollar */
if (size > 1 && data[1] == '$')
return parse_math(ob, doc, data, offset, size, "$$", 2, 1);
/* single dollar allowed only with MATH_EXPLICIT flag */
if (doc->ext_flags & HOEDOWN_EXT_MATH_EXPLICIT)
return parse_math(ob, doc, data, offset, size, "$", 1, 0);
return 0;
}
/*********************************
* BLOCK-LEVEL PARSING FUNCTIONS *
*********************************/
/* is_empty • returns the line length when it is empty, 0 otherwise */
static size_t
is_empty(const uint8_t *data, size_t size)
{
size_t i;
for (i = 0; i < size && data[i] != '\n'; i++)
if (data[i] != ' ')
return 0;
return i + 1;
}
/* is_hrule • returns whether a line is a horizontal rule */
static int
is_hrule(uint8_t *data, size_t size)
{
size_t i = 0, n = 0;
uint8_t c;
/* skipping initial spaces */
if (size < 3) return 0;
if (data[0] == ' ') { i++;
if (data[1] == ' ') { i++;
if (data[2] == ' ') { i++; } } }
/* looking at the hrule uint8_t */
if (i + 2 >= size
|| (data[i] != '*' && data[i] != '-' && data[i] != '_'))
return 0;
c = data[i];
/* the whole line must be the char or space */
while (i < size && data[i] != '\n') {
if (data[i] == c) n++;
else if (data[i] != ' ')
return 0;
i++;
}
return n >= 3;
}
/* check if a line is a code fence; return the
* end of the code fence. if passed, width of
* the fence rule and character will be returned */
static size_t
is_codefence(uint8_t *data, size_t size, size_t *width, uint8_t *chr)
{
size_t i = 0, n = 1;
uint8_t c;
/* skipping initial spaces */
if (size < 3)
return 0;
if (data[0] == ' ') { i++;
if (data[1] == ' ') { i++;
if (data[2] == ' ') { i++; } } }
/* looking at the hrule uint8_t */
c = data[i];
if (i + 2 >= size || !(c=='~' || c=='`'))
return 0;
/* the fence must be that same character */
while (++i < size && data[i] == c)
++n;
if (n < 3)
return 0;
if (width) *width = n;
if (chr) *chr = c;
return i;
}
/* expects single line, checks if it's a codefence and extracts language */
static size_t
parse_codefence(uint8_t *data, size_t size, hoedown_buffer *lang, size_t *width, uint8_t *chr)
{
size_t i, w, lang_start;
i = w = is_codefence(data, size, width, chr);
if (i == 0)
return 0;
while (i < size && _isspace(data[i]))
i++;
lang_start = i;
while (i < size && !_isspace(data[i]))
i++;
lang->data = data + lang_start;
lang->size = i - lang_start;
/* Avoid parsing a codespan as a fence */
i = lang_start + 2;
while (i < size && !(data[i] == *chr && data[i-1] == *chr && data[i-2] == *chr)) i++;
if (i < size) return 0;
return w;
}
/* is_atxheader • returns whether the line is a hash-prefixed header */
static int
is_atxheader(hoedown_document *doc, uint8_t *data, size_t size)
{
if (data[0] != '#')
return 0;
if (doc->ext_flags & HOEDOWN_EXT_SPACE_HEADERS) {
size_t level = 0;
while (level < size && level < 6 && data[level] == '#')
level++;
if (level < size && data[level] != ' ')
return 0;
}
return 1;
}
/* is_headerline • returns whether the line is a setext-style hdr underline */
static int
is_headerline(uint8_t *data, size_t size)
{
size_t i = 0;
/* test of level 1 header */
if (data[i] == '=') {
for (i = 1; i < size && data[i] == '='; i++);
while (i < size && data[i] == ' ') i++;
return (i >= size || data[i] == '\n') ? 1 : 0; }
/* test of level 2 header */
if (data[i] == '-') {
for (i = 1; i < size && data[i] == '-'; i++);
while (i < size && data[i] == ' ') i++;
return (i >= size || data[i] == '\n') ? 2 : 0; }
return 0;
}
static int
is_next_headerline(uint8_t *data, size_t size)
{
size_t i = 0;
while (i < size && data[i] != '\n')
i++;
if (++i >= size)
return 0;
return is_headerline(data + i, size - i);
}
/* prefix_quote • returns blockquote prefix length */
static size_t
prefix_quote(uint8_t *data, size_t size)
{
size_t i = 0;
if (i < size && data[i] == ' ') i++;
if (i < size && data[i] == ' ') i++;
if (i < size && data[i] == ' ') i++;
if (i < size && data[i] == '>') {
if (i + 1 < size && data[i + 1] == ' ')
return i + 2;
return i + 1;
}
return 0;
}
/* prefix_code • returns prefix length for block code*/
static size_t
prefix_code(uint8_t *data, size_t size)
{
if (size > 3 && data[0] == ' ' && data[1] == ' '
&& data[2] == ' ' && data[3] == ' ') return 4;
return 0;
}
/* prefix_oli • returns ordered list item prefix */
static size_t
prefix_oli(uint8_t *data, size_t size)
{
size_t i = 0;
if (i < size && data[i] == ' ') i++;
if (i < size && data[i] == ' ') i++;
if (i < size && data[i] == ' ') i++;
if (i >= size || data[i] < '0' || data[i] > '9')
return 0;
while (i < size && data[i] >= '0' && data[i] <= '9')
i++;
if (i + 1 >= size || data[i] != '.' || data[i + 1] != ' ')
return 0;
if (is_next_headerline(data + i, size - i))
return 0;
return i + 2;
}
/* prefix_uli • returns ordered list item prefix */
static size_t
prefix_uli(uint8_t *data, size_t size)
{
size_t i = 0;
if (i < size && data[i] == ' ') i++;
if (i < size && data[i] == ' ') i++;
if (i < size && data[i] == ' ') i++;
if (i + 1 >= size ||
(data[i] != '*' && data[i] != '+' && data[i] != '-') ||
data[i + 1] != ' ')
return 0;
if (is_next_headerline(data + i, size - i))
return 0;
return i + 2;
}
/* parse_block • parsing of one block, returning next uint8_t to parse */
static void parse_block(hoedown_buffer *ob, hoedown_document *doc,
uint8_t *data, size_t size);
/* parse_blockquote • handles parsing of a blockquote fragment */
static size_t
parse_blockquote(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t size)
{
size_t beg, end = 0, pre, work_size = 0;
uint8_t *work_data = 0;
hoedown_buffer *out = 0;
out = newbuf(doc, BUFFER_BLOCK);
beg = 0;
while (beg < size) {
for (end = beg + 1; end < size && data[end - 1] != '\n'; end++);
pre = prefix_quote(data + beg, end - beg);
if (pre)
beg += pre; /* skipping prefix */
/* empty line followed by non-quote line */
else if (is_empty(data + beg, end - beg) &&
(end >= size || (prefix_quote(data + end, size - end) == 0 &&
!is_empty(data + end, size - end))))
break;
if (beg < end) { /* copy into the in-place working buffer */
/* hoedown_buffer_put(work, data + beg, end - beg); */
if (!work_data)
work_data = data + beg;
else if (data + beg != work_data + work_size)
memmove(work_data + work_size, data + beg, end - beg);
work_size += end - beg;
}
beg = end;
}
parse_block(out, doc, work_data, work_size);
if (doc->md.blockquote)
doc->md.blockquote(ob, out, &doc->data);
popbuf(doc, BUFFER_BLOCK);
return end;
}
static size_t
parse_htmlblock(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t size, int do_render);
/* parse_blockquote • handles parsing of a regular paragraph */
static size_t
parse_paragraph(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t size)
{
hoedown_buffer work = { NULL, 0, 0, 0, NULL, NULL, NULL };
size_t i = 0, end = 0;
int level = 0;
work.data = data;
while (i < size) {
for (end = i + 1; end < size && data[end - 1] != '\n'; end++) /* empty */;
if (is_empty(data + i, size - i))
break;
if ((level = is_headerline(data + i, size - i)) != 0)
break;
if (is_atxheader(doc, data + i, size - i) ||
is_hrule(data + i, size - i) ||
prefix_quote(data + i, size - i)) {
end = i;
break;
}
i = end;
}
work.size = i;
while (work.size && data[work.size - 1] == '\n')
work.size--;
if (!level) {
hoedown_buffer *tmp = newbuf(doc, BUFFER_BLOCK);
parse_inline(tmp, doc, work.data, work.size);
if (doc->md.paragraph)
doc->md.paragraph(ob, tmp, &doc->data);
popbuf(doc, BUFFER_BLOCK);
} else {
hoedown_buffer *header_work;
if (work.size) {
size_t beg;
i = work.size;
work.size -= 1;
while (work.size && data[work.size] != '\n')
work.size -= 1;
beg = work.size + 1;
while (work.size && data[work.size - 1] == '\n')
work.size -= 1;
if (work.size > 0) {
hoedown_buffer *tmp = newbuf(doc, BUFFER_BLOCK);
parse_inline(tmp, doc, work.data, work.size);
if (doc->md.paragraph)
doc->md.paragraph(ob, tmp, &doc->data);
popbuf(doc, BUFFER_BLOCK);
work.data += beg;
work.size = i - beg;
}
else work.size = i;
}
header_work = newbuf(doc, BUFFER_SPAN);
parse_inline(header_work, doc, work.data, work.size);
if (doc->md.header)
doc->md.header(ob, header_work, (int)level, &doc->data);
popbuf(doc, BUFFER_SPAN);
}
return end;
}
/* parse_fencedcode • handles parsing of a block-level code fragment */
static size_t
parse_fencedcode(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t size)
{
hoedown_buffer text = { 0, 0, 0, 0, NULL, NULL, NULL };
hoedown_buffer lang = { 0, 0, 0, 0, NULL, NULL, NULL };
size_t i = 0, text_start, line_start;
size_t w, w2;
size_t width, width2;
uint8_t chr, chr2;
/* parse codefence line */
while (i < size && data[i] != '\n')
i++;
w = parse_codefence(data, i, &lang, &width, &chr);
if (!w)
return 0;
/* search for end */
i++;
text_start = i;
while ((line_start = i) < size) {
while (i < size && data[i] != '\n')
i++;
w2 = is_codefence(data + line_start, i - line_start, &width2, &chr2);
if (w == w2 && width == width2 && chr == chr2 &&
is_empty(data + (line_start+w), i - (line_start+w)))
break;
i++;
}
text.data = data + text_start;
text.size = line_start - text_start;
if (doc->md.blockcode)
doc->md.blockcode(ob, text.size ? &text : NULL, lang.size ? &lang : NULL, &doc->data);
return i;
}
static size_t
parse_blockcode(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t size)
{
size_t beg, end, pre;
hoedown_buffer *work = 0;
work = newbuf(doc, BUFFER_BLOCK);
beg = 0;
while (beg < size) {
for (end = beg + 1; end < size && data[end - 1] != '\n'; end++) {};
pre = prefix_code(data + beg, end - beg);
if (pre)
beg += pre; /* skipping prefix */
else if (!is_empty(data + beg, end - beg))
/* non-empty non-prefixed line breaks the pre */
break;
if (beg < end) {
/* verbatim copy to the working buffer,
escaping entities */
if (is_empty(data + beg, end - beg))
hoedown_buffer_putc(work, '\n');
else hoedown_buffer_put(work, data + beg, end - beg);
}
beg = end;
}
while (work->size && work->data[work->size - 1] == '\n')
work->size -= 1;
hoedown_buffer_putc(work, '\n');
if (doc->md.blockcode)
doc->md.blockcode(ob, work, NULL, &doc->data);
popbuf(doc, BUFFER_BLOCK);
return beg;
}
/* parse_listitem • parsing of a single list item */
/* assuming initial prefix is already removed */
static size_t
parse_listitem(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t size, hoedown_list_flags *flags)
{
hoedown_buffer *work = 0, *inter = 0;
size_t beg = 0, end, pre, sublist = 0, orgpre = 0, i;
int in_empty = 0, has_inside_empty = 0, in_fence = 0;
/* keeping track of the first indentation prefix */
while (orgpre < 3 && orgpre < size && data[orgpre] == ' ')
orgpre++;
beg = prefix_uli(data, size);
if (!beg)
beg = prefix_oli(data, size);
if (!beg)
return 0;
/* skipping to the beginning of the following line */
end = beg;
while (end < size && data[end - 1] != '\n')
end++;
/* getting working buffers */
work = newbuf(doc, BUFFER_SPAN);
inter = newbuf(doc, BUFFER_SPAN);
/* putting the first line into the working buffer */
hoedown_buffer_put(work, data + beg, end - beg);
beg = end;
/* process the following lines */
while (beg < size) {
size_t has_next_uli = 0, has_next_oli = 0;
end++;
while (end < size && data[end - 1] != '\n')
end++;
/* process an empty line */
if (is_empty(data + beg, end - beg)) {
in_empty = 1;
beg = end;
continue;
}
/* calculating the indentation */
i = 0;
while (i < 4 && beg + i < end && data[beg + i] == ' ')
i++;
pre = i;
if (doc->ext_flags & HOEDOWN_EXT_FENCED_CODE) {
if (is_codefence(data + beg + i, end - beg - i, NULL, NULL))
in_fence = !in_fence;
}
/* Only check for new list items if we are **not** inside
* a fenced code block */
if (!in_fence) {
has_next_uli = prefix_uli(data + beg + i, end - beg - i);
has_next_oli = prefix_oli(data + beg + i, end - beg - i);
}
/* checking for a new item */
if ((has_next_uli && !is_hrule(data + beg + i, end - beg - i)) || has_next_oli) {
if (in_empty)
has_inside_empty = 1;
/* the following item must have the same (or less) indentation */
if (pre <= orgpre) {
/* if the following item has different list type, we end this list */
if (in_empty && (
((*flags & HOEDOWN_LIST_ORDERED) && has_next_uli) ||
(!(*flags & HOEDOWN_LIST_ORDERED) && has_next_oli)))
*flags |= HOEDOWN_LI_END;
break;
}
if (!sublist)
sublist = work->size;
}
/* joining only indented stuff after empty lines;
* note that now we only require 1 space of indentation
* to continue a list */
else if (in_empty && pre == 0) {
*flags |= HOEDOWN_LI_END;
break;
}
if (in_empty) {
hoedown_buffer_putc(work, '\n');
has_inside_empty = 1;
in_empty = 0;
}
/* adding the line without prefix into the working buffer */
hoedown_buffer_put(work, data + beg + i, end - beg - i);
beg = end;
}
/* render of li contents */
if (has_inside_empty)
*flags |= HOEDOWN_LI_BLOCK;
if (*flags & HOEDOWN_LI_BLOCK) {
/* intermediate render of block li */
if (sublist && sublist < work->size) {
parse_block(inter, doc, work->data, sublist);
parse_block(inter, doc, work->data + sublist, work->size - sublist);
}
else
parse_block(inter, doc, work->data, work->size);
} else {
/* intermediate render of inline li */
if (sublist && sublist < work->size) {
parse_inline(inter, doc, work->data, sublist);
parse_block(inter, doc, work->data + sublist, work->size - sublist);
}
else
parse_inline(inter, doc, work->data, work->size);
}
/* render of li itself */
if (doc->md.listitem)
doc->md.listitem(ob, inter, *flags, &doc->data);
popbuf(doc, BUFFER_SPAN);
popbuf(doc, BUFFER_SPAN);
return beg;
}
/* parse_list • parsing ordered or unordered list block */
static size_t
parse_list(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t size, hoedown_list_flags flags)
{
hoedown_buffer *work = 0;
size_t i = 0, j;
work = newbuf(doc, BUFFER_BLOCK);
while (i < size) {
j = parse_listitem(work, doc, data + i, size - i, &flags);
i += j;
if (!j || (flags & HOEDOWN_LI_END))
break;
}
if (doc->md.list)
doc->md.list(ob, work, flags, &doc->data);
popbuf(doc, BUFFER_BLOCK);
return i;
}
/* parse_atxheader • parsing of atx-style headers */
static size_t
parse_atxheader(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t size)
{
size_t level = 0;
size_t i, end, skip;
while (level < size && level < 6 && data[level] == '#')
level++;
for (i = level; i < size && data[i] == ' '; i++);
for (end = i; end < size && data[end] != '\n'; end++);
skip = end;
while (end && data[end - 1] == '#')
end--;
while (end && data[end - 1] == ' ')
end--;
if (end > i) {
hoedown_buffer *work = newbuf(doc, BUFFER_SPAN);
parse_inline(work, doc, data + i, end - i);
if (doc->md.header)
doc->md.header(ob, work, (int)level, &doc->data);
popbuf(doc, BUFFER_SPAN);
}
return skip;
}
/* parse_footnote_def • parse a single footnote definition */
static void
parse_footnote_def(hoedown_buffer *ob, hoedown_document *doc, unsigned int num, uint8_t *data, size_t size)
{
hoedown_buffer *work = 0;
work = newbuf(doc, BUFFER_SPAN);
parse_block(work, doc, data, size);
if (doc->md.footnote_def)
doc->md.footnote_def(ob, work, num, &doc->data);
popbuf(doc, BUFFER_SPAN);
}
/* parse_footnote_list • render the contents of the footnotes */
static void
parse_footnote_list(hoedown_buffer *ob, hoedown_document *doc, struct footnote_list *footnotes)
{
hoedown_buffer *work = 0;
struct footnote_item *item;
struct footnote_ref *ref;
if (footnotes->count == 0)
return;
work = newbuf(doc, BUFFER_BLOCK);
item = footnotes->head;
while (item) {
ref = item->ref;
parse_footnote_def(work, doc, ref->num, ref->contents->data, ref->contents->size);
item = item->next;
}
if (doc->md.footnotes)
doc->md.footnotes(ob, work, &doc->data);
popbuf(doc, BUFFER_BLOCK);
}
/* htmlblock_is_end • check for end of HTML block : </tag>( *)\n */
/* returns tag length on match, 0 otherwise */
/* assumes data starts with "<" */
static size_t
htmlblock_is_end(
const char *tag,
size_t tag_len,
hoedown_document *doc,
uint8_t *data,
size_t size)
{
size_t i = tag_len + 3, w;
/* try to match the end tag */
/* note: we're not considering tags like "</tag >" which are still valid */
if (i > size ||
data[1] != '/' ||
strncasecmp((char *)data + 2, tag, tag_len) != 0 ||
data[tag_len + 2] != '>')
return 0;
/* rest of the line must be empty */
if ((w = is_empty(data + i, size - i)) == 0 && i < size)
return 0;
return i + w;
}
/* htmlblock_find_end • try to find HTML block ending tag */
/* returns the length on match, 0 otherwise */
static size_t
htmlblock_find_end(
const char *tag,
size_t tag_len,
hoedown_document *doc,
uint8_t *data,
size_t size)
{
size_t i = 0, w;
while (1) {
while (i < size && data[i] != '<') i++;
if (i >= size) return 0;
w = htmlblock_is_end(tag, tag_len, doc, data + i, size - i);
if (w) return i + w;
i++;
}
}
/* htmlblock_find_end_strict • try to find end of HTML block in strict mode */
/* (it must be an unindented line, and have a blank line afterwads) */
/* returns the length on match, 0 otherwise */
static size_t
htmlblock_find_end_strict(
const char *tag,
size_t tag_len,
hoedown_document *doc,
uint8_t *data,
size_t size)
{
size_t i = 0, mark;
while (1) {
mark = i;
while (i < size && data[i] != '\n') i++;
if (i < size) i++;
if (i == mark) return 0;
if (data[mark] == ' ' && mark > 0) continue;
mark += htmlblock_find_end(tag, tag_len, doc, data + mark, i - mark);
if (mark == i && (is_empty(data + i, size - i) || i >= size)) break;
}
return i;
}
/* parse_htmlblock • parsing of inline HTML block */
static size_t
parse_htmlblock(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t size, int do_render)
{
hoedown_buffer work = { NULL, 0, 0, 0, NULL, NULL, NULL };
size_t i, j = 0, tag_len, tag_end;
const char *curtag = NULL;
work.data = data;
/* identification of the opening tag */
if (size < 2 || data[0] != '<')
return 0;
i = 1;
while (i < size && data[i] != '>' && data[i] != ' ')
i++;
if (i < size)
curtag = hoedown_find_block_tag((char *)data + 1, (int)i - 1);
/* handling of special cases */
if (!curtag) {
/* HTML comment, laxist form */
if (size > 5 && data[1] == '!' && data[2] == '-' && data[3] == '-') {
i = 5;
while (i < size && !(data[i - 2] == '-' && data[i - 1] == '-' && data[i] == '>'))
i++;
i++;
if (i < size)
j = is_empty(data + i, size - i);
if (j) {
work.size = i + j;
if (do_render && doc->md.blockhtml)
doc->md.blockhtml(ob, &work, &doc->data);
return work.size;
}
}
/* HR, which is the only self-closing block tag considered */
if (size > 4 && (data[1] == 'h' || data[1] == 'H') && (data[2] == 'r' || data[2] == 'R')) {
i = 3;
while (i < size && data[i] != '>')
i++;
if (i + 1 < size) {
i++;
j = is_empty(data + i, size - i);
if (j) {
work.size = i + j;
if (do_render && doc->md.blockhtml)
doc->md.blockhtml(ob, &work, &doc->data);
return work.size;
}
}
}
/* no special case recognised */
return 0;
}
/* looking for a matching closing tag in strict mode */
tag_len = strlen(curtag);
tag_end = htmlblock_find_end_strict(curtag, tag_len, doc, data, size);
/* if not found, trying a second pass looking for indented match */
/* but not if tag is "ins" or "del" (following original Markdown.pl) */
if (!tag_end && strcmp(curtag, "ins") != 0 && strcmp(curtag, "del") != 0)
tag_end = htmlblock_find_end(curtag, tag_len, doc, data, size);
if (!tag_end)
return 0;
/* the end of the block has been found */
work.size = tag_end;
if (do_render && doc->md.blockhtml)
doc->md.blockhtml(ob, &work, &doc->data);
return tag_end;
}
static void
parse_table_row(
hoedown_buffer *ob,
hoedown_document *doc,
uint8_t *data,
size_t size,
size_t columns,
hoedown_table_flags *col_data,
hoedown_table_flags header_flag)
{
size_t i = 0, col, len;
hoedown_buffer *row_work = 0;
if (!doc->md.table_cell || !doc->md.table_row)
return;
row_work = newbuf(doc, BUFFER_SPAN);
if (i < size && data[i] == '|')
i++;
for (col = 0; col < columns && i < size; ++col) {
size_t cell_start, cell_end;
hoedown_buffer *cell_work;
cell_work = newbuf(doc, BUFFER_SPAN);
while (i < size && _isspace(data[i]))
i++;
cell_start = i;
len = find_emph_char(data + i, size - i, '|');
i += len ? len : size - i;
cell_end = i - 1;
while (cell_end > cell_start && _isspace(data[cell_end]))
cell_end--;
parse_inline(cell_work, doc, data + cell_start, 1 + cell_end - cell_start);
doc->md.table_cell(row_work, cell_work, col_data[col] | header_flag, &doc->data);
popbuf(doc, BUFFER_SPAN);
i++;
}
for (; col < columns; ++col) {
hoedown_buffer empty_cell = { 0, 0, 0, 0, NULL, NULL, NULL };
doc->md.table_cell(row_work, &empty_cell, col_data[col] | header_flag, &doc->data);
}
doc->md.table_row(ob, row_work, &doc->data);
popbuf(doc, BUFFER_SPAN);
}
static size_t
parse_table_header(
hoedown_buffer *ob,
hoedown_document *doc,
uint8_t *data,
size_t size,
size_t *columns,
hoedown_table_flags **column_data)
{
int pipes;
size_t i = 0, col, header_end, under_end;
pipes = 0;
while (i < size && data[i] != '\n')
if (data[i++] == '|')
pipes++;
if (i == size || pipes == 0)
return 0;
header_end = i;
while (header_end > 0 && _isspace(data[header_end - 1]))
header_end--;
if (data[0] == '|')
pipes--;
if (header_end && data[header_end - 1] == '|')
pipes--;
if (pipes < 0)
return 0;
*columns = pipes + 1;
*column_data = hoedown_calloc(*columns, sizeof(hoedown_table_flags));
/* Parse the header underline */
i++;
if (i < size && data[i] == '|')
i++;
under_end = i;
while (under_end < size && data[under_end] != '\n')
under_end++;
for (col = 0; col < *columns && i < under_end; ++col) {
size_t dashes = 0;
while (i < under_end && data[i] == ' ')
i++;
if (data[i] == ':') {
i++; (*column_data)[col] |= HOEDOWN_TABLE_ALIGN_LEFT;
dashes++;
}
while (i < under_end && data[i] == '-') {
i++; dashes++;
}
if (i < under_end && data[i] == ':') {
i++; (*column_data)[col] |= HOEDOWN_TABLE_ALIGN_RIGHT;
dashes++;
}
while (i < under_end && data[i] == ' ')
i++;
if (i < under_end && data[i] != '|' && data[i] != '+')
break;
if (dashes < 3)
break;
i++;
}
if (col < *columns)
return 0;
parse_table_row(
ob, doc, data,
header_end,
*columns,
*column_data,
HOEDOWN_TABLE_HEADER
);
return under_end + 1;
}
static size_t
parse_table(
hoedown_buffer *ob,
hoedown_document *doc,
uint8_t *data,
size_t size)
{
size_t i;
hoedown_buffer *work = 0;
hoedown_buffer *header_work = 0;
hoedown_buffer *body_work = 0;
size_t columns;
hoedown_table_flags *col_data = NULL;
work = newbuf(doc, BUFFER_BLOCK);
header_work = newbuf(doc, BUFFER_SPAN);
body_work = newbuf(doc, BUFFER_BLOCK);
i = parse_table_header(header_work, doc, data, size, &columns, &col_data);
if (i > 0) {
while (i < size) {
size_t row_start;
int pipes = 0;
row_start = i;
while (i < size && data[i] != '\n')
if (data[i++] == '|')
pipes++;
if (pipes == 0 || i == size) {
i = row_start;
break;
}
parse_table_row(
body_work,
doc,
data + row_start,
i - row_start,
columns,
col_data, 0
);
i++;
}
if (doc->md.table_header)
doc->md.table_header(work, header_work, &doc->data);
if (doc->md.table_body)
doc->md.table_body(work, body_work, &doc->data);
if (doc->md.table)
doc->md.table(ob, work, &doc->data);
}
free(col_data);
popbuf(doc, BUFFER_SPAN);
popbuf(doc, BUFFER_BLOCK);
popbuf(doc, BUFFER_BLOCK);
return i;
}
/* parse_block • parsing of one block, returning next uint8_t to parse */
static void
parse_block(hoedown_buffer *ob, hoedown_document *doc, uint8_t *data, size_t size)
{
size_t beg, end, i;
uint8_t *txt_data;
beg = 0;
if (doc->work_bufs[BUFFER_SPAN].size +
doc->work_bufs[BUFFER_BLOCK].size > doc->max_nesting)
return;
while (beg < size) {
txt_data = data + beg;
end = size - beg;
if (is_atxheader(doc, txt_data, end))
beg += parse_atxheader(ob, doc, txt_data, end);
else if (data[beg] == '<' && doc->md.blockhtml &&
(i = parse_htmlblock(ob, doc, txt_data, end, 1)) != 0)
beg += i;
else if ((i = is_empty(txt_data, end)) != 0)
beg += i;
else if (is_hrule(txt_data, end)) {
if (doc->md.hrule)
doc->md.hrule(ob, &doc->data);
while (beg < size && data[beg] != '\n')
beg++;
beg++;
}
else if ((doc->ext_flags & HOEDOWN_EXT_FENCED_CODE) != 0 &&
(i = parse_fencedcode(ob, doc, txt_data, end)) != 0)
beg += i;
else if ((doc->ext_flags & HOEDOWN_EXT_TABLES) != 0 &&
(i = parse_table(ob, doc, txt_data, end)) != 0)
beg += i;
else if (prefix_quote(txt_data, end))
beg += parse_blockquote(ob, doc, txt_data, end);
else if (!(doc->ext_flags & HOEDOWN_EXT_DISABLE_INDENTED_CODE) && prefix_code(txt_data, end))
beg += parse_blockcode(ob, doc, txt_data, end);
else if (prefix_uli(txt_data, end))
beg += parse_list(ob, doc, txt_data, end, 0);
else if (prefix_oli(txt_data, end))
beg += parse_list(ob, doc, txt_data, end, HOEDOWN_LIST_ORDERED);
else
beg += parse_paragraph(ob, doc, txt_data, end);
}
}
/*********************
* REFERENCE PARSING *
*********************/
/* is_footnote • returns whether a line is a footnote definition or not */
static int
is_footnote(const uint8_t *data, size_t beg, size_t end, size_t *last, struct footnote_list *list)
{
size_t i = 0;
hoedown_buffer *contents = 0;
size_t ind = 0;
int in_empty = 0;
size_t start = 0;
size_t id_offset, id_end;
/* up to 3 optional leading spaces */
if (beg + 3 >= end) return 0;
if (data[beg] == ' ') { i = 1;
if (data[beg + 1] == ' ') { i = 2;
if (data[beg + 2] == ' ') { i = 3;
if (data[beg + 3] == ' ') return 0; } } }
i += beg;
/* id part: caret followed by anything between brackets */
if (data[i] != '[') return 0;
i++;
if (i >= end || data[i] != '^') return 0;
i++;
id_offset = i;
while (i < end && data[i] != '\n' && data[i] != '\r' && data[i] != ']')
i++;
if (i >= end || data[i] != ']') return 0;
id_end = i;
/* spacer: colon (space | tab)* newline? (space | tab)* */
i++;
if (i >= end || data[i] != ':') return 0;
i++;
/* getting content buffer */
contents = hoedown_buffer_new(64);
start = i;
/* process lines similar to a list item */
while (i < end) {
while (i < end && data[i] != '\n' && data[i] != '\r') i++;
/* process an empty line */
if (is_empty(data + start, i - start)) {
in_empty = 1;
if (i < end && (data[i] == '\n' || data[i] == '\r')) {
i++;
if (i < end && data[i] == '\n' && data[i - 1] == '\r') i++;
}
start = i;
continue;
}
/* calculating the indentation */
ind = 0;
while (ind < 4 && start + ind < end && data[start + ind] == ' ')
ind++;
/* joining only indented stuff after empty lines;
* note that now we only require 1 space of indentation
* to continue, just like lists */
if (ind == 0) {
if (start == id_end + 2 && data[start] == '\t') {}
else break;
}
else if (in_empty) {
hoedown_buffer_putc(contents, '\n');
}
in_empty = 0;
/* adding the line into the content buffer */
hoedown_buffer_put(contents, data + start + ind, i - start - ind);
/* add carriage return */
if (i < end) {
hoedown_buffer_putc(contents, '\n');
if (i < end && (data[i] == '\n' || data[i] == '\r')) {
i++;
if (i < end && data[i] == '\n' && data[i - 1] == '\r') i++;
}
}
start = i;
}
if (last)
*last = start;
if (list) {
struct footnote_ref *ref;
ref = create_footnote_ref(list, data + id_offset, id_end - id_offset);
if (!ref)
return 0;
if (!add_footnote_ref(list, ref)) {
free_footnote_ref(ref);
return 0;
}
ref->contents = contents;
}
return 1;
}
/* is_ref • returns whether a line is a reference or not */
static int
is_ref(const uint8_t *data, size_t beg, size_t end, size_t *last, struct link_ref **refs)
{
/* int n; */
size_t i = 0;
size_t id_offset, id_end;
size_t link_offset, link_end;
size_t title_offset, title_end;
size_t line_end;
/* up to 3 optional leading spaces */
if (beg + 3 >= end) return 0;
if (data[beg] == ' ') { i = 1;
if (data[beg + 1] == ' ') { i = 2;
if (data[beg + 2] == ' ') { i = 3;
if (data[beg + 3] == ' ') return 0; } } }
i += beg;
/* id part: anything but a newline between brackets */
if (data[i] != '[') return 0;
i++;
id_offset = i;
while (i < end && data[i] != '\n' && data[i] != '\r' && data[i] != ']')
i++;
if (i >= end || data[i] != ']') return 0;
id_end = i;
/* spacer: colon (space | tab)* newline? (space | tab)* */
i++;
if (i >= end || data[i] != ':') return 0;
i++;
while (i < end && data[i] == ' ') i++;
if (i < end && (data[i] == '\n' || data[i] == '\r')) {
i++;
if (i < end && data[i] == '\r' && data[i - 1] == '\n') i++; }
while (i < end && data[i] == ' ') i++;
if (i >= end) return 0;
/* link: spacing-free sequence, optionally between angle brackets */
if (data[i] == '<')
i++;
link_offset = i;
while (i < end && data[i] != ' ' && data[i] != '\n' && data[i] != '\r')
i++;
if (data[i - 1] == '>') link_end = i - 1;
else link_end = i;
/* optional spacer: (space | tab)* (newline | '\'' | '"' | '(' ) */
while (i < end && data[i] == ' ') i++;
if (i < end && data[i] != '\n' && data[i] != '\r'
&& data[i] != '\'' && data[i] != '"' && data[i] != '(')
return 0;
line_end = 0;
/* computing end-of-line */
if (i >= end || data[i] == '\r' || data[i] == '\n') line_end = i;
if (i + 1 < end && data[i] == '\n' && data[i + 1] == '\r')
line_end = i + 1;
/* optional (space|tab)* spacer after a newline */
if (line_end) {
i = line_end + 1;
while (i < end && data[i] == ' ') i++; }
/* optional title: any non-newline sequence enclosed in '"()
alone on its line */
title_offset = title_end = 0;
if (i + 1 < end
&& (data[i] == '\'' || data[i] == '"' || data[i] == '(')) {
i++;
title_offset = i;
/* looking for EOL */
while (i < end && data[i] != '\n' && data[i] != '\r') i++;
if (i + 1 < end && data[i] == '\n' && data[i + 1] == '\r')
title_end = i + 1;
else title_end = i;
/* stepping back */
i -= 1;
while (i > title_offset && data[i] == ' ')
i -= 1;
if (i > title_offset
&& (data[i] == '\'' || data[i] == '"' || data[i] == ')')) {
line_end = title_end;
title_end = i; } }
if (!line_end || link_end == link_offset)
return 0; /* garbage after the link empty link */
/* a valid ref has been found, filling-in return structures */
if (last)
*last = line_end;
if (refs) {
struct link_ref *ref;
ref = add_link_ref(refs, data + id_offset, id_end - id_offset);
if (!ref)
return 0;
ref->link = hoedown_buffer_new(link_end - link_offset);
hoedown_buffer_put(ref->link, data + link_offset, link_end - link_offset);
if (title_end > title_offset) {
ref->title = hoedown_buffer_new(title_end - title_offset);
hoedown_buffer_put(ref->title, data + title_offset, title_end - title_offset);
}
}
return 1;
}
static void expand_tabs(hoedown_buffer *ob, const uint8_t *line, size_t size)
{
/* This code makes two assumptions:
* - Input is valid UTF-8. (Any byte with top two bits 10 is skipped,
* whether or not it is a valid UTF-8 continuation byte.)
* - Input contains no combining characters. (Combining characters
* should be skipped but are not.)
*/
size_t i = 0, tab = 0;
while (i < size) {
size_t org = i;
while (i < size && line[i] != '\t') {
/* ignore UTF-8 continuation bytes */
if ((line[i] & 0xc0) != 0x80)
tab++;
i++;
}
if (i > org)
hoedown_buffer_put(ob, line + org, i - org);
if (i >= size)
break;
do {
hoedown_buffer_putc(ob, ' '); tab++;
} while (tab % 4);
i++;
}
}
/**********************
* EXPORTED FUNCTIONS *
**********************/
hoedown_document *
hoedown_document_new(
const hoedown_renderer *renderer,
hoedown_extensions extensions,
size_t max_nesting)
{
hoedown_document *doc = NULL;
assert(max_nesting > 0 && renderer);
doc = hoedown_malloc(sizeof(hoedown_document));
memcpy(&doc->md, renderer, sizeof(hoedown_renderer));
doc->data.opaque = renderer->opaque;
hoedown_stack_init(&doc->work_bufs[BUFFER_BLOCK], 4);
hoedown_stack_init(&doc->work_bufs[BUFFER_SPAN], 8);
memset(doc->active_char, 0x0, 256);
if (extensions & HOEDOWN_EXT_UNDERLINE && doc->md.underline) {
doc->active_char['_'] = MD_CHAR_EMPHASIS;
}
if (doc->md.emphasis || doc->md.double_emphasis || doc->md.triple_emphasis) {
doc->active_char['*'] = MD_CHAR_EMPHASIS;
doc->active_char['_'] = MD_CHAR_EMPHASIS;
if (extensions & HOEDOWN_EXT_STRIKETHROUGH)
doc->active_char['~'] = MD_CHAR_EMPHASIS;
if (extensions & HOEDOWN_EXT_HIGHLIGHT)
doc->active_char['='] = MD_CHAR_EMPHASIS;
}
if (doc->md.codespan)
doc->active_char['`'] = MD_CHAR_CODESPAN;
if (doc->md.linebreak)
doc->active_char['\n'] = MD_CHAR_LINEBREAK;
if (doc->md.image || doc->md.link || doc->md.footnotes || doc->md.footnote_ref)
doc->active_char['['] = MD_CHAR_LINK;
doc->active_char['<'] = MD_CHAR_LANGLE;
doc->active_char['\\'] = MD_CHAR_ESCAPE;
doc->active_char['&'] = MD_CHAR_ENTITY;
if (extensions & HOEDOWN_EXT_AUTOLINK) {
doc->active_char[':'] = MD_CHAR_AUTOLINK_URL;
doc->active_char['@'] = MD_CHAR_AUTOLINK_EMAIL;
doc->active_char['w'] = MD_CHAR_AUTOLINK_WWW;
}
if (extensions & HOEDOWN_EXT_SUPERSCRIPT)
doc->active_char['^'] = MD_CHAR_SUPERSCRIPT;
if (extensions & HOEDOWN_EXT_QUOTE)
doc->active_char['"'] = MD_CHAR_QUOTE;
if (extensions & HOEDOWN_EXT_MATH)
doc->active_char['$'] = MD_CHAR_MATH;
/* Extension data */
doc->ext_flags = extensions;
doc->max_nesting = max_nesting;
doc->in_link_body = 0;
return doc;
}
void
hoedown_document_render(hoedown_document *doc, hoedown_buffer *ob, const uint8_t *data, size_t size)
{
static const uint8_t UTF8_BOM[] = {0xEF, 0xBB, 0xBF};
hoedown_buffer *text;
size_t beg, end;
int footnotes_enabled;
text = hoedown_buffer_new(64);
/* Preallocate enough space for our buffer to avoid expanding while copying */
hoedown_buffer_grow(text, size);
/* reset the references table */
memset(&doc->refs, 0x0, REF_TABLE_SIZE * sizeof(void *));
footnotes_enabled = doc->ext_flags & HOEDOWN_EXT_FOOTNOTES;
/* reset the footnotes lists */
if (footnotes_enabled) {
memset(&doc->footnotes_found, 0x0, sizeof(doc->footnotes_found));
memset(&doc->footnotes_used, 0x0, sizeof(doc->footnotes_used));
}
/* first pass: looking for references, copying everything else */
beg = 0;
/* Skip a possible UTF-8 BOM, even though the Unicode standard
* discourages having these in UTF-8 documents */
if (size >= 3 && memcmp(data, UTF8_BOM, 3) == 0)
beg += 3;
while (beg < size) /* iterating over lines */
if (footnotes_enabled && is_footnote(data, beg, size, &end, &doc->footnotes_found))
beg = end;
else if (is_ref(data, beg, size, &end, doc->refs))
beg = end;
else { /* skipping to the next line */
end = beg;
while (end < size && data[end] != '\n' && data[end] != '\r')
end++;
/* adding the line body if present */
if (end > beg)
expand_tabs(text, data + beg, end - beg);
while (end < size && (data[end] == '\n' || data[end] == '\r')) {
/* add one \n per newline */
if (data[end] == '\n' || (end + 1 < size && data[end + 1] != '\n'))
hoedown_buffer_putc(text, '\n');
end++;
}
beg = end;
}
/* pre-grow the output buffer to minimize allocations */
hoedown_buffer_grow(ob, text->size + (text->size >> 1));
/* second pass: actual rendering */
if (doc->md.doc_header)
doc->md.doc_header(ob, 0, &doc->data);
if (text->size) {
/* adding a final newline if not already present */
if (text->data[text->size - 1] != '\n' && text->data[text->size - 1] != '\r')
hoedown_buffer_putc(text, '\n');
parse_block(ob, doc, text->data, text->size);
}
/* footnotes */
if (footnotes_enabled)
parse_footnote_list(ob, doc, &doc->footnotes_used);
if (doc->md.doc_footer)
doc->md.doc_footer(ob, 0, &doc->data);
/* clean-up */
hoedown_buffer_free(text);
free_link_refs(doc->refs);
if (footnotes_enabled) {
free_footnote_list(&doc->footnotes_found, 1);
free_footnote_list(&doc->footnotes_used, 0);
}
assert(doc->work_bufs[BUFFER_SPAN].size == 0);
assert(doc->work_bufs[BUFFER_BLOCK].size == 0);
}
void
hoedown_document_render_inline(hoedown_document *doc, hoedown_buffer *ob, const uint8_t *data, size_t size)
{
size_t i = 0, mark;
hoedown_buffer *text = hoedown_buffer_new(64);
/* reset the references table */
memset(&doc->refs, 0x0, REF_TABLE_SIZE * sizeof(void *));
/* first pass: expand tabs and process newlines */
hoedown_buffer_grow(text, size);
while (1) {
mark = i;
while (i < size && data[i] != '\n' && data[i] != '\r')
i++;
expand_tabs(text, data + mark, i - mark);
if (i >= size)
break;
while (i < size && (data[i] == '\n' || data[i] == '\r')) {
/* add one \n per newline */
if (data[i] == '\n' || (i + 1 < size && data[i + 1] != '\n'))
hoedown_buffer_putc(text, '\n');
i++;
}
}
/* second pass: actual rendering */
hoedown_buffer_grow(ob, text->size + (text->size >> 1));
if (doc->md.doc_header)
doc->md.doc_header(ob, 1, &doc->data);
parse_inline(ob, doc, text->data, text->size);
if (doc->md.doc_footer)
doc->md.doc_footer(ob, 1, &doc->data);
/* clean-up */
hoedown_buffer_free(text);
assert(doc->work_bufs[BUFFER_SPAN].size == 0);
assert(doc->work_bufs[BUFFER_BLOCK].size == 0);
}
void
hoedown_document_free(hoedown_document *doc)
{
size_t i;
for (i = 0; i < (size_t)doc->work_bufs[BUFFER_SPAN].asize; ++i)
hoedown_buffer_free(doc->work_bufs[BUFFER_SPAN].item[i]);
for (i = 0; i < (size_t)doc->work_bufs[BUFFER_BLOCK].asize; ++i)
hoedown_buffer_free(doc->work_bufs[BUFFER_BLOCK].item[i]);
hoedown_stack_uninit(&doc->work_bufs[BUFFER_SPAN]);
hoedown_stack_uninit(&doc->work_bufs[BUFFER_BLOCK]);
free(doc);
}