/src/rt/sundown/src/markdown.c
C | 2556 lines | 2331 code | 146 blank | 79 comment | 202 complexity | 2437de5c51a6dbcde1f1b059f9d169b2 MD5 | raw file
Possible License(s): JSON, Apache-2.0, MIT, AGPL-1.0
Large files files are truncated, but you can click here to view the full file
- /* markdown.c - generic markdown parser */
- /*
- * Copyright (c) 2009, Natacha Porté
- * Copyright (c) 2011, Vicent Marti
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
- #include "markdown.h"
- #include "stack.h"
- #include <assert.h>
- #include <string.h>
- #include <ctype.h>
- #include <stdio.h>
- #if defined(_WIN32)
- #define strncasecmp _strnicmp
- #endif
- #define REF_TABLE_SIZE 8
- #define BUFFER_BLOCK 0
- #define BUFFER_SPAN 1
- #define MKD_LI_END 8 /* internal list flag */
- #define gperf_case_strncmp(s1, s2, n) strncasecmp(s1, s2, n)
- #define GPERF_DOWNCASE 1
- #define GPERF_CASE_STRNCMP 1
- #include "html_blocks.h"
- /***************
- * LOCAL TYPES *
- ***************/
- /* link_ref: reference to a link */
- struct link_ref {
- unsigned int id;
- struct buf *link;
- struct buf *title;
- struct link_ref *next;
- };
- /* 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 */
- struct sd_markdown;
- typedef size_t
- (*char_trigger)(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size);
- static size_t char_emphasis(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size);
- static size_t char_linebreak(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size);
- static size_t char_codespan(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size);
- static size_t char_escape(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size);
- static size_t char_entity(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size);
- static size_t char_langle_tag(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size);
- static size_t char_autolink_url(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size);
- static size_t char_autolink_email(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size);
- static size_t char_autolink_www(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size);
- static size_t char_link(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size);
- static size_t char_superscript(struct buf *ob, struct sd_markdown *rndr, 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_ENTITITY,
- MD_CHAR_AUTOLINK_URL,
- MD_CHAR_AUTOLINK_EMAIL,
- MD_CHAR_AUTOLINK_WWW,
- MD_CHAR_SUPERSCRIPT,
- };
- 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,
- };
- /* render • structure containing one particular render */
- struct sd_markdown {
- struct sd_callbacks cb;
- void *opaque;
- struct link_ref *refs[REF_TABLE_SIZE];
- uint8_t active_char[256];
- struct stack work_bufs[2];
- unsigned int ext_flags;
- size_t max_nesting;
- int in_link_body;
- };
- /***************************
- * HELPER FUNCTIONS *
- ***************************/
- static inline struct buf *
- rndr_newbuf(struct sd_markdown *rndr, int type)
- {
- static const size_t buf_size[2] = {256, 64};
- struct buf *work = NULL;
- struct stack *pool = &rndr->work_bufs[type];
- if (pool->size < pool->asize &&
- pool->item[pool->size] != NULL) {
- work = pool->item[pool->size++];
- work->size = 0;
- } else {
- work = bufnew(buf_size[type]);
- stack_push(pool, work);
- }
- return work;
- }
- static inline void
- rndr_popbuf(struct sd_markdown *rndr, int type)
- {
- rndr->work_bufs[type].size--;
- }
- static void
- unscape_text(struct buf *ob, struct buf *src)
- {
- size_t i = 0, org;
- while (i < src->size) {
- org = i;
- while (i < src->size && src->data[i] != '\\')
- i++;
- if (i > org)
- bufput(ob, src->data + org, i - org);
- if (i + 1 >= src->size)
- break;
- bufputc(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 = calloc(1, sizeof(struct link_ref));
- if (!ref)
- return NULL;
- 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;
- bufrelease(r->link);
- bufrelease(r->title);
- free(r);
- r = next;
- }
- }
- }
- /*
- * Check whether a char is a Markdown space.
- * 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 inline int
- _isspace(int c)
- {
- return c == ' ' || c == '\n';
- }
- /****************************
- * 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, enum mkd_autolink *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 = MKDA_NOT_AUTOLINK;
- /* 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 = MKDA_EMAIL;
- return i + j;
- }
- }
- if (i > 2 && data[i] == ':') {
- *autolink = MKDA_NORMAL;
- i++;
- }
- /* completing autolink test: no whitespace or ' or " */
- if (i >= size)
- *autolink = MKDA_NOT_AUTOLINK;
- 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 = MKDA_NOT_AUTOLINK;
- }
- /* looking for sometinhg 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(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t size)
- {
- size_t i = 0, end = 0;
- uint8_t action = 0;
- struct buf work = { 0, 0, 0, 0 };
- if (rndr->work_bufs[BUFFER_SPAN].size +
- rndr->work_bufs[BUFFER_BLOCK].size > rndr->max_nesting)
- return;
- while (i < size) {
- /* copying inactive chars into the output */
- while (end < size && (action = rndr->active_char[data[end]]) == 0) {
- end++;
- }
- if (rndr->cb.normal_text) {
- work.data = data + i;
- work.size = end - i;
- rndr->cb.normal_text(ob, &work, rndr->opaque);
- }
- else
- bufput(ob, data + i, end - i);
- if (end >= size) break;
- i = end;
- end = markdown_char_ptrs[(int)action](ob, rndr, data + i, i, size - i);
- if (!end) /* no action from the callback */
- end = i + 1;
- else {
- i += end;
- end = i;
- }
- }
- }
- /* 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 = 1;
- while (i < size) {
- while (i < size && data[i] != c && data[i] != '`' && data[i] != '[')
- i++;
- if (i == size)
- return 0;
- if (data[i] == c)
- return i;
- /* not counting escaped chars */
- if (i && data[i - 1] == '\\') {
- i++; continue;
- }
- 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++;
- }
- 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 && (data[i] == ' ' || data[i] == '\n'))
- 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 whitespace and not followed by symbol */
- static size_t
- parse_emph1(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t size, uint8_t c)
- {
- size_t i = 0, len;
- struct buf *work = 0;
- int r;
- if (!rndr->cb.emphasis) return 0;
- /* 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 (rndr->ext_flags & MKDEXT_NO_INTRA_EMPHASIS) {
- if (i + 1 < size && isalnum(data[i + 1]))
- continue;
- }
- work = rndr_newbuf(rndr, BUFFER_SPAN);
- parse_inline(work, rndr, data, i);
- r = rndr->cb.emphasis(ob, work, rndr->opaque);
- rndr_popbuf(rndr, BUFFER_SPAN);
- return r ? i + 1 : 0;
- }
- }
- return 0;
- }
- /* parse_emph2 • parsing single emphase */
- static size_t
- parse_emph2(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t size, uint8_t c)
- {
- int (*render_method)(struct buf *ob, const struct buf *text, void *opaque);
- size_t i = 0, len;
- struct buf *work = 0;
- int r;
- render_method = (c == '~') ? rndr->cb.strikethrough : rndr->cb.double_emphasis;
- if (!render_method)
- return 0;
- 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 = rndr_newbuf(rndr, BUFFER_SPAN);
- parse_inline(work, rndr, data, i);
- r = render_method(ob, work, rndr->opaque);
- rndr_popbuf(rndr, 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(struct buf *ob, struct sd_markdown *rndr, 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 whitespace preceded symbols */
- if (data[i] != c || _isspace(data[i - 1]))
- continue;
- if (i + 2 < size && data[i + 1] == c && data[i + 2] == c && rndr->cb.triple_emphasis) {
- /* triple symbol found */
- struct buf *work = rndr_newbuf(rndr, BUFFER_SPAN);
- parse_inline(work, rndr, data, i);
- r = rndr->cb.triple_emphasis(ob, work, rndr->opaque);
- rndr_popbuf(rndr, 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, rndr, 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, rndr, data - 1, size + 1, c);
- if (!len) return 0;
- else return len - 1;
- }
- }
- return 0;
- }
- /* char_emphasis • single and double emphasis parsing */
- static size_t
- char_emphasis(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size)
- {
- uint8_t c = data[0];
- size_t ret;
- if (rndr->ext_flags & MKDEXT_NO_INTRA_EMPHASIS) {
- if (offset > 0 && !_isspace(data[-1]) && data[-1] != '>')
- return 0;
- }
- if (size > 2 && data[1] != c) {
- /* whitespace cannot follow an opening emphasis;
- * strikethrough only takes two characters '~~' */
- if (c == '~' || _isspace(data[1]) || (ret = parse_emph1(ob, rndr, 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, rndr, 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 == '~' || _isspace(data[3]) || (ret = parse_emph3(ob, rndr, 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(struct buf *ob, struct sd_markdown *rndr, 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 rndr->cb.linebreak(ob, rndr->opaque) ? 1 : 0;
- }
- /* char_codespan • '`' parsing a code span (assuming codespan != 0) */
- static size_t
- char_codespan(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size)
- {
- 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 whitespaces */
- 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) {
- struct buf work = { data + f_begin, f_end - f_begin, 0, 0 };
- if (!rndr->cb.codespan(ob, &work, rndr->opaque))
- end = 0;
- } else {
- if (!rndr->cb.codespan(ob, 0, rndr->opaque))
- end = 0;
- }
- return end;
- }
- /* char_escape • '\\' backslash escape */
- static size_t
- char_escape(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size)
- {
- static const char *escape_chars = "\\`*_{}[]()#+-.!:|&<>^~";
- struct buf work = { 0, 0, 0, 0 };
- if (size > 1) {
- if (strchr(escape_chars, data[1]) == NULL)
- return 0;
- if (rndr->cb.normal_text) {
- work.data = data + 1;
- work.size = 1;
- rndr->cb.normal_text(ob, &work, rndr->opaque);
- }
- else bufputc(ob, data[1]);
- } else if (size == 1) {
- bufputc(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(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size)
- {
- size_t end = 1;
- struct buf work = { 0, 0, 0, 0 };
- 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 (rndr->cb.entity) {
- work.data = data;
- work.size = end;
- rndr->cb.entity(ob, &work, rndr->opaque);
- }
- else bufput(ob, data, end);
- return end;
- }
- /* char_langle_tag • '<' when tags or autolinks are allowed */
- static size_t
- char_langle_tag(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size)
- {
- enum mkd_autolink altype = MKDA_NOT_AUTOLINK;
- size_t end = tag_length(data, size, &altype);
- struct buf work = { data, end, 0, 0 };
- int ret = 0;
- if (end > 2) {
- if (rndr->cb.autolink && altype != MKDA_NOT_AUTOLINK) {
- struct buf *u_link = rndr_newbuf(rndr, BUFFER_SPAN);
- work.data = data + 1;
- work.size = end - 2;
- unscape_text(u_link, &work);
- ret = rndr->cb.autolink(ob, u_link, altype, rndr->opaque);
- rndr_popbuf(rndr, BUFFER_SPAN);
- }
- else if (rndr->cb.raw_html_tag)
- ret = rndr->cb.raw_html_tag(ob, &work, rndr->opaque);
- }
- if (!ret) return 0;
- else return end;
- }
- static size_t
- char_autolink_www(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size)
- {
- struct buf *link, *link_url, *link_text;
- size_t link_len, rewind;
- if (!rndr->cb.link || rndr->in_link_body)
- return 0;
- link = rndr_newbuf(rndr, BUFFER_SPAN);
- if ((link_len = sd_autolink__www(&rewind, link, data, offset, size, 0)) > 0) {
- link_url = rndr_newbuf(rndr, BUFFER_SPAN);
- BUFPUTSL(link_url, "http://");
- bufput(link_url, link->data, link->size);
- ob->size -= rewind;
- if (rndr->cb.normal_text) {
- link_text = rndr_newbuf(rndr, BUFFER_SPAN);
- rndr->cb.normal_text(link_text, link, rndr->opaque);
- rndr->cb.link(ob, link_url, NULL, link_text, rndr->opaque);
- rndr_popbuf(rndr, BUFFER_SPAN);
- } else {
- rndr->cb.link(ob, link_url, NULL, link, rndr->opaque);
- }
- rndr_popbuf(rndr, BUFFER_SPAN);
- }
- rndr_popbuf(rndr, BUFFER_SPAN);
- return link_len;
- }
- static size_t
- char_autolink_email(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size)
- {
- struct buf *link;
- size_t link_len, rewind;
- if (!rndr->cb.autolink || rndr->in_link_body)
- return 0;
- link = rndr_newbuf(rndr, BUFFER_SPAN);
- if ((link_len = sd_autolink__email(&rewind, link, data, offset, size, 0)) > 0) {
- ob->size -= rewind;
- rndr->cb.autolink(ob, link, MKDA_EMAIL, rndr->opaque);
- }
- rndr_popbuf(rndr, BUFFER_SPAN);
- return link_len;
- }
- static size_t
- char_autolink_url(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size)
- {
- struct buf *link;
- size_t link_len, rewind;
- if (!rndr->cb.autolink || rndr->in_link_body)
- return 0;
- link = rndr_newbuf(rndr, BUFFER_SPAN);
- if ((link_len = sd_autolink__url(&rewind, link, data, offset, size, 0)) > 0) {
- ob->size -= rewind;
- rndr->cb.autolink(ob, link, MKDA_NORMAL, rndr->opaque);
- }
- rndr_popbuf(rndr, BUFFER_SPAN);
- return link_len;
- }
- /* char_link • '[': parsing a link or an image */
- static size_t
- char_link(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size)
- {
- int is_img = (offset && data[-1] == '!'), level;
- size_t i = 1, txt_e, link_b = 0, link_e = 0, title_b = 0, title_e = 0;
- struct buf *content = 0;
- struct buf *link = 0;
- struct buf *title = 0;
- struct buf *u_link = 0;
- size_t org_work_size = rndr->work_bufs[BUFFER_SPAN].size;
- int text_has_nl = 0, ret = 0;
- int in_title = 0, qtype = 0;
- /* checking whether the correct renderer exists */
- if ((is_img && !rndr->cb.image) || (!is_img && !rndr->cb.link))
- goto cleanup;
- /* looking for the matching closing bracket */
- for (level = 1; i < size; i++) {
- if (data[i] == '\n')
- text_has_nl = 1;
- else if (data[i - 1] == '\\')
- continue;
- else if (data[i] == '[')
- level++;
- else if (data[i] == ']') {
- level--;
- if (level <= 0)
- break;
- }
- }
- if (i >= size)
- goto cleanup;
- txt_e = i;
- i++;
- /* skip any amount of whitespace or newline */
- /* (this is much more laxist than original markdown syntax) */
- while (i < size && _isspace(data[i]))
- i++;
- /* inline style link */
- if (i < size && data[i] == '(') {
- /* skipping initial whitespace */
- i++;
- while (i < size && _isspace(data[i]))
- i++;
- link_b = i;
- /* looking for link end: ' " ) */
- while (i < size) {
- if (data[i] == '\\') i += 2;
- else if (data[i] == ')') break;
- 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 whitespaces 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 whitespace 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 = rndr_newbuf(rndr, BUFFER_SPAN);
- bufput(link, data + link_b, link_e - link_b);
- }
- if (title_e > title_b) {
- title = rndr_newbuf(rndr, BUFFER_SPAN);
- bufput(title, data + title_b, title_e - title_b);
- }
- i++;
- }
- /* reference style link */
- else if (i < size && data[i] == '[') {
- struct buf id = { 0, 0, 0, 0 };
- 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) {
- if (text_has_nl) {
- struct buf *b = rndr_newbuf(rndr, BUFFER_SPAN);
- size_t j;
- for (j = 1; j < txt_e; j++) {
- if (data[j] != '\n')
- bufputc(b, data[j]);
- else if (data[j - 1] != ' ')
- bufputc(b, ' ');
- }
- id.data = b->data;
- id.size = b->size;
- } else {
- id.data = data + 1;
- id.size = txt_e - 1;
- }
- } else {
- id.data = data + link_b;
- id.size = link_e - link_b;
- }
- lr = find_link_ref(rndr->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 {
- struct buf id = { 0, 0, 0, 0 };
- struct link_ref *lr;
- /* crafting the id */
- if (text_has_nl) {
- struct buf *b = rndr_newbuf(rndr, BUFFER_SPAN);
- size_t j;
- for (j = 1; j < txt_e; j++) {
- if (data[j] != '\n')
- bufputc(b, data[j]);
- else if (data[j - 1] != ' ')
- bufputc(b, ' ');
- }
- id.data = b->data;
- id.size = b->size;
- } else {
- id.data = data + 1;
- id.size = txt_e - 1;
- }
- /* finding the link_ref */
- lr = find_link_ref(rndr->refs, id.data, id.size);
- if (!lr)
- goto cleanup;
- /* keeping link and title from link_ref */
- link = lr->link;
- title = lr->title;
- /* rewinding the whitespace */
- i = txt_e + 1;
- }
- /* building content: img alt is escaped, link content is parsed */
- if (txt_e > 1) {
- content = rndr_newbuf(rndr, BUFFER_SPAN);
- if (is_img) {
- bufput(content, data + 1, txt_e - 1);
- } else {
- /* disable autolinking when parsing inline the
- * content of a link */
- rndr->in_link_body = 1;
- parse_inline(content, rndr, data + 1, txt_e - 1);
- rndr->in_link_body = 0;
- }
- }
- if (link) {
- u_link = rndr_newbuf(rndr, 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 = rndr->cb.image(ob, u_link, title, content, rndr->opaque);
- } else {
- ret = rndr->cb.link(ob, u_link, title, content, rndr->opaque);
- }
- /* cleanup */
- cleanup:
- rndr->work_bufs[BUFFER_SPAN].size = (int)org_work_size;
- return ret ? i : 0;
- }
- static size_t
- char_superscript(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t offset, size_t size)
- {
- size_t sup_start, sup_len;
- struct buf *sup;
- if (!rndr->cb.superscript)
- return 0;
- if (size < 2)
- return 0;
- if (data[1] == '(') {
- sup_start = sup_len = 2;
- while (sup_len < size && data[sup_len] != ')' && data[sup_len - 1] != '\\')
- sup_len++;
- 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 = rndr_newbuf(rndr, BUFFER_SPAN);
- parse_inline(sup, rndr, data + sup_start, sup_len - sup_start);
- rndr->cb.superscript(ob, sup, rndr->opaque);
- rndr_popbuf(rndr, BUFFER_SPAN);
- return (sup_start == 2) ? sup_len + 1 : sup_len;
- }
- /*********************************
- * BLOCK-LEVEL PARSING FUNCTIONS *
- *********************************/
- /* is_empty • returns the line length when it is empty, 0 otherwise */
- static size_t
- is_empty(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 whitespace */
- 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 begins with a code fence; return the
- * width of the code fence */
- static size_t
- prefix_codefence(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] == '`'))
- return 0;
- c = data[i];
- /* the whole line must be the uint8_t or whitespace */
- while (i < size && data[i] == c) {
- n++; i++;
- }
- if (n < 3)
- return 0;
- return i;
- }
- /* check if a line is a code fence; return its size if it is */
- static size_t
- is_codefence(uint8_t *data, size_t size, struct buf *syntax)
- {
- size_t i = 0, syn_len = 0;
- uint8_t *syn_start;
- i = prefix_codefence(data, size);
- if (i == 0)
- return 0;
- while (i < size && data[i] == ' ')
- i++;
- syn_start = data + i;
- if (i < size && data[i] == '{') {
- i++; syn_start++;
- while (i < size && data[i] != '}' && data[i] != '\n') {
- syn_len++; i++;
- }
- if (i == size || data[i] != '}')
- return 0;
- /* strip all whitespace at the beginning and the end
- * of the {} block */
- while (syn_len > 0 && _isspace(syn_start[0])) {
- syn_start++; syn_len--;
- }
- while (syn_len > 0 && _isspace(syn_start[syn_len - 1]))
- syn_len--;
- i++;
- } else {
- while (i < size && !_isspace(data[i])) {
- syn_len++; i++;
- }
- }
- if (syntax) {
- syntax->data = syn_start;
- syntax->size = syn_len;
- }
- while (i < size && data[i] != '\n') {
- if (!_isspace(data[i]))
- return 0;
- i++;
- }
- return i + 1;
- }
- /* is_atxheader • returns whether the line is a hash-prefixed header */
- static int
- is_atxheader(struct sd_markdown *rndr, uint8_t *data, size_t size)
- {
- if (data[0] != '#')
- return 0;
- if (rndr->ext_flags & MKDEXT_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(struct buf *ob, struct sd_markdown *rndr,
- uint8_t *data, size_t size);
- /* parse_blockquote • handles parsing of a blockquote fragment */
- static size_t
- parse_blockquote(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t size)
- {
- size_t beg, end = 0, pre, work_size = 0;
- uint8_t *work_data = 0;
- struct buf *out = 0;
- out = rndr_newbuf(rndr, 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 */
- /* bufput(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, rndr, work_data, work_size);
- if (rndr->cb.blockquote)
- rndr->cb.blockquote(ob, out, rndr->opaque);
- rndr_popbuf(rndr, BUFFER_BLOCK);
- return end;
- }
- static size_t
- parse_htmlblock(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t size, int do_render);
- /* parse_blockquote • handles parsing of a regular paragraph */
- static size_t
- parse_paragraph(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t size)
- {
- size_t i = 0, end = 0;
- int level = 0;
- struct buf work = { data, 0, 0, 0 };
- 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(rndr, data + i, size - i) ||
- is_hrule(data + i, size - i) ||
- prefix_quote(data + i, size - i)) {
- end = i;
- break;
- }
- /*
- * Early termination of a paragraph with the same logic
- * as Markdown 1.0.0. If this logic is applied, the
- * Markdown 1.0.3 test suite won't pass cleanly
- *
- * :: If the first character in a new line is not a letter,
- * let's check to see if there's some kind of block starting
- * here
- */
- if ((rndr->ext_flags & MKDEXT_LAX_SPACING) && !isalnum(data[i])) {
- if (prefix_oli(data + i, size - i) ||
- prefix_uli(data + i, size - i)) {
- end = i;
- break;
- }
- /* see if an html block starts here */
- if (data[i] == '<' && rndr->cb.blockhtml &&
- parse_htmlblock(ob, rndr, data + i, size - i, 0)) {
- end = i;
- break;
- }
- /* see if a code fence starts here */
- if ((rndr->ext_flags & MKDEXT_FENCED_CODE) != 0 &&
- is_codefence(data + i, size - i, NULL) != 0) {
- end = i;
- break;
- }
- }
- i = end;
- }
- work.size = i;
- while (work.size && data[work.size - 1] == '\n')
- work.size--;
- if (!level) {
- struct buf *tmp = rndr_newbuf(rndr, BUFFER_BLOCK);
- parse_inline(tmp, rndr, work.data, work.size);
- if (rndr->cb.paragraph)
- rndr->cb.paragraph(ob, tmp, rndr->opaque);
- rndr_popbuf(rndr, BUFFER_BLOCK);
- } else {
- struct buf *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) {
- struct buf *tmp = rndr_newbuf(rndr, BUFFER_BLOCK);
- parse_inline(tmp, rndr, work.data, work.size);
- if (rndr->cb.paragraph)
- rndr->cb.paragraph(ob, tmp, rndr->opaque);
- rndr_popbuf(rndr, BUFFER_BLOCK);
- work.data += beg;
- work.size = i - beg;
- }
- else work.size = i;
- }
- header_work = rndr_newbuf(rndr, BUFFER_SPAN);
- parse_inline(header_work, rndr, work.data, work.size);
- if (rndr->cb.header)
- rndr->cb.header(ob, header_work, (int)level, rndr->opaque);
- rndr_popbuf(rndr, BUFFER_SPAN);
- }
- return end;
- }
- /* parse_fencedcode • handles parsing of a block-level code fragment */
- static size_t
- parse_fencedcode(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t size)
- {
- size_t beg, end;
- struct buf *work = 0;
- struct buf lang = { 0, 0, 0, 0 };
- beg = is_codefence(data, size, &lang);
- if (beg == 0) return 0;
- work = rndr_newbuf(rndr, BUFFER_BLOCK);
- while (beg < size) {
- size_t fence_end;
- struct buf fence_trail = { 0, 0, 0, 0 };
- fence_end = is_codefence(data + beg, size - beg, &fence_trail);
- if (fence_end != 0 && fence_trail.size == 0) {
- beg += fence_end;
- break;
- }
- for (end = beg + 1; end < size && data[end - 1] != '\n'; end++);
- if (beg < end) {
- /* verbatim copy to the working buffer,
- escaping entities */
- if (is_empty(data + beg, end - beg))
- bufputc(work, '\n');
- else bufput(work, data + beg, end - beg);
- }
- beg = end;
- }
- if (work->size && work->data[work->size - 1] != '\n')
- bufputc(work, '\n');
- if (rndr->cb.blockcode)
- rndr->cb.blockcode(ob, work, lang.size ? &lang : NULL, rndr->opaque);
- rndr_popbuf(rndr, BUFFER_BLOCK);
- return beg;
- }
- static size_t
- parse_blockcode(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t size)
- {
- size_t beg, end, pre;
- struct buf *work = 0;
- work = rndr_newbuf(rndr, 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))
- bufputc(work, '\n');
- else bufput(work, data + beg, end - beg);
- }
- beg = end;
- }
- while (work->size && work->data[work->size - 1] == '\n')
- work->size -= 1;
- bufputc(work, '\n');
- if (rndr->cb.blockcode)
- rndr->cb.blockcode(ob, work, NULL, rndr->opaque);
- rndr_popbuf(rndr, BUFFER_BLOCK);
- return beg;
- }
- /* parse_listitem • parsing of a single list item */
- /* assuming initial prefix is already removed */
- static size_t
- parse_listitem(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t size, int *flags)
- {
- struct buf *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 = rndr_newbuf(rndr, BUFFER_SPAN);
- inter = rndr_newbuf(rndr, BUFFER_SPAN);
- /* putting the first line into the working buffer */
- bufput(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 (rndr->ext_flags & MKDEXT_FENCED_CODE) {
- if (is_codefence(data + beg + i, end - beg - i, NULL) != 0)
- 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 ul/ol switch */
- if (in_empty && (
- ((*flags & MKD_LIST_ORDERED) && has_next_uli) ||
- (!(*flags & MKD_LIST_ORDERED) && has_next_oli))){
- *flags |= MKD_LI_END;
- break; /* the following item must have same list type */
- }
- /* 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;
- if (pre == orgpre) /* the following item must have */
- break; /* the same indentation */
- 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 |= MKD_LI_END;
- break;
- }
- else if (in_empty) {
- bufputc(work, '\n');
- has_inside_empty = 1;
- }
- in_empty = 0;
- /* adding the line without prefix into the working buffer */
- bufput(work, data + beg + i, end - beg - i);
- beg = end;
- }
- /* render of li contents */
- if (has_inside_empty)
- *flags |= MKD_LI_BLOCK;
- if (*flags & MKD_LI_BLOCK) {
- /* intermediate render of block li */
- if (sublist && sublist < work->size) {
- parse_block(inter, rndr, work->data, sublist);
- parse_block(inter, rndr, work->data + sublist, work->size - sublist);
- }
- else
- parse_block(inter, rndr, work->data, work->size);
- } else {
- /* intermediate render of inline li */
- if (sublist && sublist < work->size) {
- parse_inline(inter, rndr, work->data, sublist);
- parse_block(inter, rndr, work->data + sublist, work->size - sublist);
- }
- else
- parse_inline(inter, rndr, work->data, work->size);
- }
- /* render of li itself */
- if (rndr->cb.listitem)
- rndr->cb.listitem(ob, inter, *flags, rndr->opaque);
- rndr_popbuf(rndr, BUFFER_SPAN);
- rndr_popbuf(rndr, BUFFER_SPAN);
- return beg;
- }
- /* parse_list • parsing ordered or unordered list block */
- static size_t
- parse_list(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t size, int flags)
- {
- struct buf *work = 0;
- size_t i = 0, j;
- work = rndr_newbuf(rndr, BUFFER_BLOCK);
- while (i < size) {
- j = parse_listitem(work, rndr, data + i, size - i, &flags);
- i += j;
- if (!j || (flags & MKD_LI_END))
- break;
- }
- if (rndr->cb.list)
- rndr->cb.list(ob, work, flags, rndr->opaque);
- rndr_popbuf(rndr, BUFFER_BLOCK);
- return i;
- }
- /* parse_atxheader • parsing of atx-style headers */
- static size_t
- parse_atxheader(struct buf *ob, struct sd_markdown *rndr, 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) {
- struct buf *work = rndr_newbuf(rndr, BUFFER_SPAN);
- parse_inline(work, rndr, data + i, end - i);
- if (rndr->cb.header)
- rndr->cb.header(ob, work, (int)level, rndr->opaque);
- rndr_popbuf(rndr, BUFFER_SPAN);
- }
- return skip;
- }
- /* htmlblock_end • checking end of HTML block : </tag>[ \t]*\n[ \t*]\n */
- /* returns the length on match, 0 otherwise */
- static size_t
- htmlblock_end_tag(
- const char *tag,
- size_t tag_len,
- struct sd_markdown *rndr,
- uint8_t *data,
- size_t size)
- {
- size_t i, w;
- /* checking if tag is a match */
- if (tag_len + 3 >= size ||
- strncasecmp((char *)data + 2, tag, tag_len) != 0 ||
- data[tag_len + 2] != '>')
- return 0;
- /* checking white lines */
- i = tag_len + 3;
- w = 0;
- if (i < size && (w = is_empty(data + i, size - i)) == 0)
- return 0; /* non-blank after tag */
- i += w;
- w = 0;
- if (i < size)
- w = is_empty(data + i, size - i);
- return i + w;
- }
- static size_t
- htmlblock_end(const char *curtag,
- struct sd_markdown *rndr,
- uint8_t *data,
- size_t size,
- int start_of_line)
- {
- size_t tag_size = strlen(curtag);
- size_t i = 1, end_tag;
- int block_lines = 0;
- while (i < size) {
- i++;
- while (i < size && !(data[i - 1] == '<' && data[i] == '/')) {
- if (data[i] == '\n')
- block_lines++;
- i++;
- }
- /* If we are only looking for unindented tags, skip the tag
- * if it doesn't follow a newline.
- *
- * The only exception to this is if the tag is still on the
- * initial line; in that case it still counts as a closing
- * tag
- */
- if (start_of_line && block_lines > 0 && data[i - 2] != '\n')
- continue;
- if (i + 2 + tag_size >= size)
- break;
- end_tag = htmlblock_end_tag(curtag, tag_size, rndr, data + i - 1, size - i + 1);
- if (end_tag)
- return i + end_tag - 1;
- }
- return 0;
- }
- /* parse_htmlblock • parsing of inline HTML block */
- static size_t
- parse_htmlblock(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t size, int do_render)
- {
- size_t i, j = 0, tag_end;
- const char *curtag = NULL;
- struct buf work = { data, 0, 0, 0 };
- /* 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 = 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 && rndr->cb.blockhtml)
- rndr->cb.blockhtml(ob, &work, rndr->opaque);
- 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 && rndr->cb.blockhtml)
- rndr->cb.blockhtml(ob, &work, rndr->opaque);
- return work.size;
- }
- }
- }
- /* no special case recognised */
- return 0;
- }
- /* looking for an unindented matching closing tag */
- /* followed by a blank line */
- tag_end = htmlblock_end(curtag, rndr, data, size, 1);
- /* 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_end(curtag, rndr, data, size, 0);
- }
- if (!tag_end)
- return 0;
- /* the end of the block has been found */
- work.size = tag_end;
- if (do_render && rndr->cb.blockhtml)
- rndr->cb.blockhtml(ob, &work, rndr->opaque);
- return tag_end;
- }
- static void
- parse_table_row(
- struct buf *ob,
- struct sd_markdown *rndr,
- uint8_t *data,
- size_t size,
- size_t columns,
- int *col_data,
- int header_flag)
- {
- size_t i = 0, col;
- struct buf *row_work = 0;
- if (!rndr->cb.table_cell || !rndr->cb.table_row)
- return;
- row_work = rndr_newbuf(rndr, BUFFER_SPAN);
- if (i < size && data[i] == '|')
- i++;
- for (col = 0; col < columns && i < size; ++col) {
- size_t cell_start, cell_end;
- struct buf *cell_work;
- cell_work = rndr_newbuf(rndr, BUFFER_SPAN);
- while (i < size && _isspace(data[i]))
- i++;
- cell_start = i;
- while (i < size && data[i] != '|')
- i++;
- cell_end = i - 1;
- while (cell_end > cell_start && _isspace(data[cell_end]))
- cell_end--;
- parse_inline(cell_work, rndr, data + cell_start, 1 + cell_end - cell_start);
- rndr->cb.table_cell(row_work, cell_work, col_data[col] | header_flag, rndr->opaque);
- rndr_popbuf(rndr, BUFFER_SPAN);
- i++;
- }
- for (; col < columns; ++col) {
- struct buf empty_cell = { 0, 0, 0, 0 };
- rndr->cb.table_cell(row_work, &empty_cell, col_data[col] | header_flag, rndr->opaque);
- }
- rndr->cb.table_row(ob, row_work, rndr->opaque);
- rndr_popbuf(rndr, BUFFER_SPAN);
- }
- static size_t
- parse_table_header(
- struct buf *ob,
- struct sd_markdown *rndr,
- uint8_t *data,
- size_t size,
- size_t *columns,
- int **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--;
- *columns = pipes + 1;
- *column_data = calloc(*columns, sizeof(int));
- /* 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] |= MKD_TABLE_ALIGN_L;
- dashes++;
- }
- while (i < under_end && data[i] == '-') {
- i++; dashes++;
- }
- if (i < under_end && data[i] == ':') {
- i++; (*column_data)[col] |= MKD_TABLE_ALIGN_R;
- dashes++;
- }
- while (i < under_end && data[i] == ' ')
- i++;
- if (i < under_end && data[i] != '|')
- break;
- if (dashes < 3)
- break;
- i++;
- }
- if (col < *columns)
- return 0;
- parse_table_row(
- ob, rndr, data,
- header_end,
- *columns,
- *column_data,
- MKD_TABLE_HEADER
- );
- return under_end + 1;
- }
- static size_t
- parse_table(
- struct buf *ob,
- struct sd_markdown *rndr,
- uint8_t *data,
- size_t size)
- {
- size_t i;
- struct buf *header_work = 0;
- struct buf *body_work = 0;
- size_t columns;
- int *col_data = NULL;
- header_work = rndr_newbuf(rndr, BUFFER_SPAN);
- body_work = rndr_newbuf(rndr, BUFFER_BLOCK);
- i = parse_table_header(header_work, rndr, 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,
- rndr,
- data + row_start,
- i - row_start,
- columns,
- col_data, 0
- );
- i++;
- }
- if (rndr->cb.table)
- rndr->cb.table(ob, header_work, body_work, rndr->opaque);
- }
- free(col_data);
- rndr_popbuf(rndr, BUFFER_SPAN);
- rndr_popbuf(rndr, BUFFER_BLOCK);
- return i;
- }
- /* parse_block • parsing of one block, returning next uint8_t to parse */
- static void
- parse_block(struct buf *ob, struct sd_markdown *rndr, uint8_t *data, size_t size)
- {
- size_t beg, end, i;
- uint8_t *txt…
Large files files are truncated, but you can click here to view the full file