NOISSUE reorganize and document libraries

1 files changed, 2958 insertions, 0 deletions

diff --git a/libraries/hoedown/src/document.c b/libraries/hoedown/src/document.c
new file mode 100644
index 00000000..8ba82e47
--- /dev/null
+++ b/libraries/hoedown/src/document.c
@@ -0,0 +1,2958 @@
+#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);
+}