mirror of
https://github.com/richgel999/ufo_data.git
synced 2024-12-25 07:29:36 -05:00
1822 lines
51 KiB
C
1822 lines
51 KiB
C
/* markdown.c - generic markdown parser */
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/*
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* Copyright (c) 2009, Natacha Porté
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "markdown.h"
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#include "array.h"
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#include <assert.h>
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#include <string.h>
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#ifdef _MSC_VER
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#include <string.h> /* for strncasecmp */
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#define strncasecmp _strnicmp
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#pragma warning (disable:4100)
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#else
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#include <strings.h> /* for strncasecmp */
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#endif
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#define TEXT_UNIT 64 /* unit for the copy of the input buffer */
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#define WORK_UNIT 64 /* block-level working buffer */
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#define MKD_LI_END 8 /* internal list flag */
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/***************
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* LOCAL TYPES *
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***************/
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/* link_ref • reference to a link */
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struct link_ref {
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struct buf * id;
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struct buf * link;
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struct buf * title; };
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/* char_trigger • function pointer to render active chars */
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/* returns the number of chars taken care of */
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/* data is the pointer of the beginning of the span */
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/* offset is the number of valid chars before data */
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struct render;
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typedef size_t
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(*char_trigger)(struct buf *ob, struct render *rndr,
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char *data, size_t offset, size_t size);
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/* render • structure containing one particular render */
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struct render {
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struct mkd_renderer make;
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struct array refs;
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char_trigger active_char[256];
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struct parray work; };
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/* html_tag • structure for quick HTML tag search (inspired from discount) */
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struct html_tag {
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char * text;
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int size; };
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/********************
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* GLOBAL VARIABLES *
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********************/
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/* block_tags • recognised block tags, sorted by cmp_html_tag */
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static struct html_tag block_tags[] = {
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/*0*/ { "p", 1 },
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{ "dl", 2 },
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{ "h1", 2 },
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{ "h2", 2 },
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{ "h3", 2 },
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{ "h4", 2 },
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{ "h5", 2 },
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{ "h6", 2 },
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{ "ol", 2 },
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{ "ul", 2 },
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/*10*/ { "del", 3 },
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{ "div", 3 },
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/*12*/ { "ins", 3 },
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{ "pre", 3 },
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{ "form", 4 },
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{ "math", 4 },
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{ "table", 5 },
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{ "iframe", 6 },
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{ "script", 6 },
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{ "fieldset", 8 },
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{ "noscript", 8 },
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{ "blockquote", 10 } };
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#define INS_TAG (block_tags + 12)
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#define DEL_TAG (block_tags + 10)
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/***************************
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* STATIC HELPER FUNCTIONS *
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***************************/
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/* build_ref_id • collapse whitespace from input text to make it a ref id */
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static int
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build_ref_id(struct buf *id, const char *data, size_t size) {
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size_t beg, i;
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/* skip leading whitespace */
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while (size > 0
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&& (data[0] == ' ' || data[0] == '\t' || data[0] == '\n')) {
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data += 1;
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size -= 1; }
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/* skip trailing whitespace */
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while (size > 0
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&& (data[size - 1] == ' ' || data[size - 1] == '\t'
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|| data[size - 1] == '\n'))
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size -= 1;
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if (size == 0) return -1;
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/* making the ref id */
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i = 0;
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id->size = 0;
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while (i < size) {
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/* copy non-whitespace into the output buffer */
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beg = i;
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while (i < size
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&& !(data[i] == ' ' || data[i] == '\t' || data[i] == '\n'))
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i += 1;
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bufput(id, data + beg, i - beg);
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/* add a single space and skip all consecutive whitespace */
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if (i < size) bufputc(id, ' ');
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while (i < size
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&& (data[i] == ' ' || data[i] == '\t' || data[i] == '\n'))
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i += 1; }
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return 0; }
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/* cmp_link_ref • comparison function for link_ref sorted arrays */
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static int
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cmp_link_ref(void *key, void *array_entry) {
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struct link_ref *lr = array_entry;
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return bufcasecmp(key, lr->id); }
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/* cmp_link_ref_sort • comparison function for link_ref qsort */
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static int
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cmp_link_ref_sort(const void *a, const void *b) {
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const struct link_ref *lra = a;
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const struct link_ref *lrb = b;
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return bufcasecmp(lra->id, lrb->id); }
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/* cmp_html_tag • comparison function for bsearch() (stolen from discount) */
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static int
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cmp_html_tag(const void *a, const void *b) {
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const struct html_tag *hta = a;
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const struct html_tag *htb = b;
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if (hta->size != htb->size) return hta->size - htb->size;
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return strncasecmp(hta->text, htb->text, hta->size); }
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/* find_block_tag • returns the current block tag */
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static struct html_tag *
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find_block_tag(char *data, size_t size) {
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size_t i = 0;
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struct html_tag key;
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/* looking for the word end */
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while (i < size && ((data[i] >= '0' && data[i] <= '9')
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|| (data[i] >= 'A' && data[i] <= 'Z')
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|| (data[i] >= 'a' && data[i] <= 'z')))
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i += 1;
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if (i >= size) return 0;
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/* binary search of the tag */
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key.text = data;
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key.size = (int)i;
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return bsearch(&key, block_tags,
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sizeof block_tags / sizeof block_tags[0],
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sizeof block_tags[0], cmp_html_tag); }
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/* new_work_buffer • get a new working buffer from the stack or create one */
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static struct buf *
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new_work_buffer(struct render *rndr) {
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struct buf *ret = 0;
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if (rndr->work.size < rndr->work.asize) {
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ret = rndr->work.item[rndr->work.size ++];
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ret->size = 0; }
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else {
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ret = bufnew(WORK_UNIT);
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parr_push(&rndr->work, ret); }
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return ret; }
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/* release_work_buffer • release the given working buffer */
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static void
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release_work_buffer(struct render *rndr, struct buf *buf) {
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assert(rndr->work.size > 0
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&& rndr->work.item[rndr->work.size - 1] == buf);
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rndr->work.size -= 1; }
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/****************************
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* INLINE PARSING FUNCTIONS *
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****************************/
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/* is_mail_autolink • looks for the address part of a mail autolink and '>' */
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/* this is less strict than the original markdown e-mail address matching */
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static size_t
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is_mail_autolink(char *data, size_t size) {
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size_t i = 0, nb = 0;
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/* address is assumed to be: [-@._a-zA-Z0-9]+ with exactly one '@' */
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while (i < size && (data[i] == '-' || data[i] == '.'
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|| data[i] == '_' || data[i] == '@'
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|| (data[i] >= 'a' && data[i] <= 'z')
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|| (data[i] >= 'A' && data[i] <= 'Z')
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|| (data[i] >= '0' && data[i] <= '9'))) {
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if (data[i] == '@') nb += 1;
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i += 1; }
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if (i >= size || data[i] != '>' || nb != 1) return 0;
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return i + 1; }
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/* tag_length • returns the length of the given tag, or 0 if it's not valid */
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static size_t
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tag_length(char *data, size_t size, enum mkd_autolink *autolink) {
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size_t i, j;
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/* a valid tag can't be shorter than 3 chars */
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if (size < 3) return 0;
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/* begins with a '<' optionally followed by '/', followed by letter */
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if (data[0] != '<') return 0;
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i = (data[1] == '/') ? 2 : 1;
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if ((data[i] < 'a' || data[i] > 'z')
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&& (data[i] < 'A' || data[i] > 'Z')) return 0;
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/* scheme test */
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*autolink = MKDA_NOT_AUTOLINK;
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if (size > 6 && strncasecmp(data + 1, "http", 4) == 0 && (data[5] == ':'
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|| ((data[5] == 's' || data[5] == 'S') && data[6] == ':'))) {
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i = data[5] == ':' ? 6 : 7;
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*autolink = MKDA_NORMAL; }
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else if (size > 5 && strncasecmp(data + 1, "ftp:", 4) == 0) {
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i = 5;
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*autolink = MKDA_NORMAL; }
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else if (size > 7 && strncasecmp(data + 1, "mailto:", 7) == 0) {
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i = 8;
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/* not changing *autolink to go to the address test */ }
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/* completing autolink test: no whitespace or ' or " */
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if (i >= size || i == '>')
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*autolink = MKDA_NOT_AUTOLINK;
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else if (*autolink) {
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j = i;
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while (i < size && data[i] != '>' && data[i] != '\''
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&& data[i] != '"' && data[i] != ' ' && data[i] != '\t'
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&& data[i] != '\n')
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i += 1;
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if (i >= size) return 0;
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if (i > j && data[i] == '>') return i + 1;
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/* one of the forbidden chars has been found */
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*autolink = MKDA_NOT_AUTOLINK; }
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else if ((j = is_mail_autolink(data + i, size - i)) != 0) {
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*autolink = (i == 8)
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? MKDA_EXPLICIT_EMAIL : MKDA_IMPLICIT_EMAIL;
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return i + j; }
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/* looking for something like a tag end */
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while (i < size && data[i] != '>') i += 1;
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if (i >= size) return 0;
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return i + 1; }
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/* parse_inline • parses inline markdown elements */
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static void
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parse_inline(struct buf *ob, struct render *rndr, char *data, size_t size) {
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size_t i = 0, end = 0;
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char_trigger action = 0;
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struct buf work = { 0, 0, 0, 0, 0 };
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if (rndr->work.size > rndr->make.max_work_stack) {
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if (size) bufput(ob, data, size);
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return; }
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while (i < size) {
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/* copying inactive chars into the output */
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while (end < size
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&& (action = rndr->active_char[(unsigned char)data[end]]) == 0)
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end += 1;
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if (rndr->make.normal_text) {
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work.data = data + i;
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work.size = end - i;
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rndr->make.normal_text(ob, &work, rndr->make.opaque); }
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else
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bufput(ob, data + i, end - i);
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if (end >= size) break;
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i = end;
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/* calling the trigger */
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end = action(ob, rndr, data + i, i, size - i);
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if (!end) /* no action from the callback */
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end = i + 1;
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else {
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i += end;
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end = i; } } }
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/* find_emph_char • looks for the next emph char, skipping other constructs */
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static size_t
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find_emph_char(char *data, size_t size, char c) {
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size_t i = 1;
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while (i < size) {
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while (i < size && data[i] != c
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&& data[i] != '`' && data[i] != '[')
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i += 1;
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if (i >= size) return 0;
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if (data[i] == c) return i;
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/* not counting escaped chars */
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if (i && data[i - 1] == '\\') { i += 1; continue; }
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/* skipping a code span */
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if (data[i] == '`') {
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size_t span_nb = 0, bt;
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size_t tmp_i = 0;
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/* counting the number of opening backticks */
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while (i < size && data[i] == '`') {
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i += 1;
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span_nb += 1; }
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if (i >= size) return 0;
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/* finding the matching closing sequence */
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bt = 0;
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while (i < size && bt < span_nb) {
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if (!tmp_i && data[i] == c) tmp_i = i;
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if (data[i] == '`') bt += 1;
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else bt = 0;
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i += 1; }
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if (i >= size) return tmp_i;
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i += 1; }
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/* skipping a link */
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else if (data[i] == '[') {
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size_t tmp_i = 0;
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char cc;
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i += 1;
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while (i < size && data[i] != ']') {
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if (!tmp_i && data[i] == c) tmp_i = i;
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i += 1; }
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i += 1;
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while (i < size && (data[i] == ' '
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|| data[i] == '\t' || data[i] == '\n'))
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i += 1;
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if (i >= size) return tmp_i;
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if (data[i] != '[' && data[i] != '(') { /* not a link*/
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if (tmp_i) return tmp_i;
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else continue; }
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cc = data[i];
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i += 1;
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while (i < size && data[i] != cc) {
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if (!tmp_i && data[i] == c) tmp_i = i;
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i += 1; }
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if (i >= size) return tmp_i;
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i += 1; } }
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return 0; }
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/* parse_emph1 • parsing single emphasis */
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/* closed by a symbol not preceded by whitespace and not followed by symbol */
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static size_t
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parse_emph1(struct buf *ob, struct render *rndr,
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char *data, size_t size, char c) {
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size_t i = 0, len;
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struct buf *work = 0;
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int r;
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if (!rndr->make.emphasis) return 0;
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/* skipping one symbol if coming from emph3 */
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if (size > 1 && data[0] == c && data[1] == c) i = 1;
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while (i < size) {
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len = find_emph_char(data + i, size - i, c);
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if (!len) return 0;
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i += len;
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if (i >= size) return 0;
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if (i + 1 < size && data[i + 1] == c) {
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i += 1;
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continue; }
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if (data[i] == c && data[i - 1] != ' '
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&& data[i - 1] != '\t' && data[i - 1] != '\n') {
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work = new_work_buffer(rndr);
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parse_inline(work, rndr, data, i);
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r = rndr->make.emphasis(ob, work, c, rndr->make.opaque);
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release_work_buffer(rndr, work);
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return r ? i + 1 : 0; } }
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return 0; }
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/* parse_emph2 • parsing single emphasis */
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static size_t
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parse_emph2(struct buf *ob, struct render *rndr,
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char *data, size_t size, char c) {
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size_t i = 0, len;
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struct buf *work = 0;
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int r;
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if (!rndr->make.double_emphasis) return 0;
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while (i < size) {
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len = find_emph_char(data + i, size - i, c);
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if (!len) return 0;
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i += len;
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if (i + 1 < size && data[i] == c && data[i + 1] == c
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&& i && data[i - 1] != ' '
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&& data[i - 1] != '\t' && data[i - 1] != '\n') {
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work = new_work_buffer(rndr);
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parse_inline(work, rndr, data, i);
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r = rndr->make.double_emphasis(ob, work, c,
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rndr->make.opaque);
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release_work_buffer(rndr, work);
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return r ? i + 2 : 0; }
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i += 1; }
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return 0; }
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/* parse_emph3 • parsing single emphasis */
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/* finds the first closing tag, and delegates to the other emph */
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static size_t
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parse_emph3(struct buf *ob, struct render *rndr,
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char *data, size_t size, char c) {
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size_t i = 0, len;
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int r;
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while (i < size) {
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len = find_emph_char(data + i, size - i, c);
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if (!len) return 0;
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i += len;
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/* skip whitespace preceded symbols */
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if (data[i] != c || data[i - 1] == ' '
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|| data[i - 1] == '\t' || data[i - 1] == '\n')
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continue;
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if (i + 2 < size && data[i + 1] == c && data[i + 2] == c
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&& rndr->make.triple_emphasis) {
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/* triple symbol found */
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struct buf *work = new_work_buffer(rndr);
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parse_inline(work, rndr, data, i);
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r = rndr->make.triple_emphasis(ob, work, c,
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rndr->make.opaque);
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release_work_buffer(rndr, work);
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return r ? i + 3 : 0; }
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else if (i + 1 < size && data[i + 1] == c) {
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/* double symbol found, handing over to emph1 */
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len = parse_emph1(ob, rndr, data - 2, size + 2, c);
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if (!len) return 0;
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else return len - 2; }
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else {
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/* single symbol found, handing over to emph2 */
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len = parse_emph2(ob, rndr, data - 1, size + 1, c);
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if (!len) return 0;
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else return len - 1; } }
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return 0; }
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/* char_emphasis • single and double emphasis parsing */
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static size_t
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|
char_emphasis(struct buf *ob, struct render *rndr,
|
|
char *data, size_t offset, size_t size) {
|
|
char c = data[0];
|
|
size_t ret;
|
|
if (size > 2 && data[1] != c) {
|
|
/* whitespace cannot follow an opening emphasis */
|
|
if (data[1] == ' ' || data[1] == '\t' || data[1] == '\n'
|
|
|| (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 (data[2] == ' ' || data[2] == '\t' || data[2] == '\n'
|
|
|| (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 (data[3] == ' ' || data[3] == '\t' || data[3] == '\n'
|
|
|| (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 render *rndr,
|
|
char *data, size_t offset, size_t size) {
|
|
if (offset < 2 || data[-1] != ' ' || data[-2] != ' ') return 0;
|
|
/* removing the last space from ob and rendering */
|
|
if (ob->size && ob->data[ob->size - 1] == ' ')
|
|
//ob->size -= 1;
|
|
ob->data[ob->size - 1] = 1; // rg
|
|
|
|
return rndr->make.linebreak(ob, rndr->make.opaque) ? 1 : 0; }
|
|
|
|
|
|
/* char_codespan • '`' parsing a code span (assuming codespan != 0) */
|
|
static size_t
|
|
char_codespan(struct buf *ob, struct render *rndr,
|
|
char *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 += 1;
|
|
|
|
/* finding the next delimiter */
|
|
i = 0;
|
|
for (end = nb; end < size && i < nb; end += 1)
|
|
if (data[end] == '`') i += 1;
|
|
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] == ' ' || data[f_begin] == '\t'))
|
|
f_begin += 1;
|
|
f_end = end - nb;
|
|
while (f_end > nb && (data[f_end-1] == ' ' || data[f_end-1] == '\t'))
|
|
f_end -= 1;
|
|
|
|
/* real code span */
|
|
if (f_begin < f_end) {
|
|
struct buf work = { data + f_begin, f_end - f_begin, 0, 0, 0 };
|
|
if (!rndr->make.codespan(ob, &work, rndr->make.opaque))
|
|
end = 0; }
|
|
else {
|
|
if (!rndr->make.codespan(ob, 0, rndr->make.opaque))
|
|
end = 0; }
|
|
return end; }
|
|
|
|
|
|
/* char_escape • '\\' backslash escape */
|
|
static size_t
|
|
char_escape(struct buf *ob, struct render *rndr,
|
|
char *data, size_t offset, size_t size) {
|
|
struct buf work = { 0, 0, 0, 0, 0 };
|
|
if (size > 1) {
|
|
if (rndr->make.normal_text) {
|
|
work.data = data + 1;
|
|
work.size = 1;
|
|
rndr->make.normal_text(ob, &work, rndr->make.opaque); }
|
|
else bufputc(ob, data[1]); }
|
|
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 render *rndr,
|
|
char *data, size_t offset, size_t size) {
|
|
size_t end = 1;
|
|
struct buf work;
|
|
if (end < size && data[end] == '#') end += 1;
|
|
while (end < size
|
|
&& ((data[end] >= '0' && data[end] <= '9')
|
|
|| (data[end] >= 'a' && data[end] <= 'z')
|
|
|| (data[end] >= 'A' && data[end] <= 'Z')))
|
|
end += 1;
|
|
if (end < size && data[end] == ';') {
|
|
/* real entity */
|
|
end += 1; }
|
|
else {
|
|
/* lone '&' */
|
|
return 0; }
|
|
if (rndr->make.entity) {
|
|
work.data = data;
|
|
work.size = end;
|
|
rndr->make.entity(ob, &work, rndr->make.opaque); }
|
|
else
|
|
{
|
|
// rg
|
|
if (rndr->make.normal_text)
|
|
{
|
|
work.data = data;
|
|
work.size = end;
|
|
rndr->make.normal_text(ob, &work, rndr->make.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 render *rndr,
|
|
char *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, 0 };
|
|
int ret = 0;
|
|
if (end) {
|
|
if (rndr->make.autolink && altype != MKDA_NOT_AUTOLINK) {
|
|
work.data = data + 1;
|
|
work.size = end - 2;
|
|
ret = rndr->make.autolink(ob, &work, altype,
|
|
rndr->make.opaque); }
|
|
else if (rndr->make.raw_html_tag)
|
|
ret = rndr->make.raw_html_tag(ob, &work,
|
|
rndr->make.opaque); }
|
|
if (!ret) return 0;
|
|
else return end; }
|
|
|
|
|
|
/* get_link_inline • extract inline-style link and title from parenthesed data*/
|
|
static int
|
|
get_link_inline(struct buf *link, struct buf *title, char *data, size_t size) {
|
|
size_t i = 0, mark;
|
|
size_t link_b, link_e;
|
|
size_t title_b = 0, title_e = 0;
|
|
|
|
link->size = title->size = 0;
|
|
|
|
/* skipping initial whitespace */
|
|
while (i < size
|
|
&& (data[i] == ' ' || data[i] == '\t' || data[i] == '\n'))
|
|
i += 1;
|
|
link_b = i;
|
|
|
|
/* looking for link end: ' " */
|
|
while (i < size && data[i] != '\'' && data[i] != '"')
|
|
i += 1;
|
|
link_e = i;
|
|
|
|
/* looking for title end if present */
|
|
if (data[i] == '\'' || data[i] == '"') {
|
|
i += 1;
|
|
title_b = i;
|
|
|
|
/* skipping whitespaces after title */
|
|
title_e = size - 1;
|
|
while (title_e > title_b && (data[title_e] == ' '
|
|
|| data[title_e] == '\t' || data[title_e] == '\n'))
|
|
title_e -= 1;
|
|
|
|
/* 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
|
|
&& (data[link_e - 1] == ' ' || data[link_e - 1] == '\t'
|
|
|| data[link_e - 1] == '\n'))
|
|
link_e -= 1;
|
|
|
|
/* remove optional angle brackets around the link */
|
|
if (data[link_b] == '<') link_b += 1;
|
|
if (data[link_e - 1] == '>') link_e -= 1;
|
|
|
|
/* escape backslashed character from link */
|
|
link->size = 0;
|
|
i = link_b;
|
|
while (i < link_e) {
|
|
mark = i;
|
|
while (i < link_e && data[i] != '\\') i += 1;
|
|
bufput(link, data + mark, i - mark);
|
|
while (i < link_e && data[i] == '\\') i += 1; }
|
|
|
|
/* handing back title */
|
|
title->size = 0;
|
|
if (title_e > title_b)
|
|
bufput(title, data + title_b, title_e - title_b);
|
|
|
|
/* this function always succeed */
|
|
return 0; }
|
|
|
|
|
|
/* get_link_ref • extract referenced link and title from id */
|
|
static int
|
|
get_link_ref(struct render *rndr, struct buf *link, struct buf *title,
|
|
char * data, size_t size) {
|
|
struct link_ref *lr;
|
|
|
|
/* find the link from its id (stored temporarily in link) */
|
|
link->size = 0;
|
|
if (build_ref_id(link, data, size) < 0)
|
|
return -1;
|
|
lr = arr_sorted_find(&rndr->refs, link, cmp_link_ref);
|
|
if (!lr) return -1;
|
|
|
|
/* fill the output buffers */
|
|
link->size = 0;
|
|
if (lr->link)
|
|
bufput(link, lr->link->data, lr->link->size);
|
|
title->size = 0;
|
|
if (lr->title)
|
|
bufput(title, lr->title->data, lr->title->size);
|
|
return 0; }
|
|
|
|
|
|
/* char_link • '[': parsing a link or an image */
|
|
static size_t
|
|
char_link(struct buf *ob, struct render *rndr,
|
|
char *data, size_t offset, size_t size) {
|
|
int is_img = (offset && data[-1] == '!'), level;
|
|
size_t i = 1, txt_e;
|
|
struct buf *content = 0;
|
|
struct buf *link = 0;
|
|
struct buf *title = 0;
|
|
int ret;
|
|
|
|
/* checking whether the correct renderer exists */
|
|
if ((is_img && !rndr->make.image) || (!is_img && !rndr->make.link))
|
|
return 0;
|
|
|
|
/* looking for the matching closing bracket */
|
|
for (level = 1; i < size; i += 1)
|
|
if (data[i - 1] == '\\') continue;
|
|
else if (data[i] == '[') level += 1;
|
|
else if (data[i] == ']') {
|
|
level -= 1;
|
|
if (level <= 0) break; }
|
|
if (i >= size) return 0;
|
|
txt_e = i;
|
|
i += 1;
|
|
|
|
/* skip any amount of whitespace or newline */
|
|
/* (this is much more laxist than original markdown syntax) */
|
|
while (i < size
|
|
&& (data[i] == ' ' || data[i] == '\t' || data[i] == '\n'))
|
|
i += 1;
|
|
|
|
/* allocate temporary buffers to store content, link and title */
|
|
content = new_work_buffer(rndr);
|
|
link = new_work_buffer(rndr);
|
|
title = new_work_buffer(rndr);
|
|
ret = 0; /* error if we don't get to the callback */
|
|
|
|
/* inline style link */
|
|
if (i < size && data[i] == '(') {
|
|
size_t span_end = i;
|
|
|
|
int in_level = 0;
|
|
#if 0
|
|
while (span_end < size && !(data[span_end] == ')' && (span_end == i || data[span_end - 1] != '\\')))
|
|
{
|
|
span_end += 1;
|
|
}
|
|
#endif
|
|
// rg - fix links with '(' characters that weren't escaped. (pandoc handles them.)
|
|
while (span_end < size)
|
|
{
|
|
if (data[span_end] == ')' && (span_end == i || data[span_end - 1] != '\\'))
|
|
{
|
|
in_level--;
|
|
if (!in_level)
|
|
break;
|
|
}
|
|
else if (data[span_end] == '(' && (span_end == i || data[span_end - 1] != '\\'))
|
|
{
|
|
in_level++;
|
|
}
|
|
|
|
span_end += 1;
|
|
}
|
|
|
|
if (span_end >= size
|
|
|| get_link_inline(link, title,
|
|
data + i+1, span_end - (i+1)) < 0)
|
|
goto char_link_cleanup;
|
|
|
|
i = span_end + 1; }
|
|
|
|
/* reference style link */
|
|
else if (i < size && data[i] == '[') {
|
|
char *id_data;
|
|
size_t id_size, id_end = i;
|
|
while (id_end < size && data[id_end] != ']')
|
|
id_end += 1;
|
|
|
|
if (id_end >= size)
|
|
goto char_link_cleanup;
|
|
|
|
if (i + 1 == id_end) {
|
|
/* implicit id - use the contents */
|
|
id_data = data + 1;
|
|
id_size = txt_e - 1; }
|
|
else {
|
|
/* explicit id - between brackets */
|
|
id_data = data + i + 1;
|
|
id_size = id_end - (i + 1); }
|
|
|
|
if (get_link_ref(rndr, link, title, id_data, id_size) < 0)
|
|
goto char_link_cleanup;
|
|
|
|
i = id_end + 1; }
|
|
|
|
/* shortcut reference style link */
|
|
else {
|
|
if (get_link_ref(rndr, link, title, data + 1, txt_e - 1) < 0)
|
|
goto char_link_cleanup;
|
|
|
|
/* rewinding the whitespace */
|
|
i = txt_e + 1; }
|
|
|
|
/* building content: img alt is escaped, link content is parsed */
|
|
if (txt_e > 1) {
|
|
if (is_img) bufput(content, data + 1, txt_e - 1);
|
|
else parse_inline(content, rndr, data + 1, txt_e - 1); }
|
|
|
|
/* calling the relevant rendering function */
|
|
if (is_img) {
|
|
if (ob->size && ob->data[ob->size - 1] == '!')
|
|
//ob->size -= 1;
|
|
ob->data[ob->size - 1] = 1; // rg
|
|
|
|
ret = rndr->make.image(ob, link, title, content,
|
|
rndr->make.opaque); }
|
|
else ret = rndr->make.link(ob, link, title, content, rndr->make.opaque);
|
|
|
|
/* cleanup */
|
|
char_link_cleanup:
|
|
release_work_buffer(rndr, title);
|
|
release_work_buffer(rndr, link);
|
|
release_work_buffer(rndr, content);
|
|
return ret ? i : 0; }
|
|
|
|
|
|
|
|
/*********************************
|
|
* BLOCK-LEVEL PARSING FUNCTIONS *
|
|
*********************************/
|
|
|
|
/* is_empty • returns the line length when it is empty, 0 otherwise */
|
|
static size_t
|
|
is_empty(char *data, size_t size) {
|
|
size_t i;
|
|
for (i = 0; i < size && data[i] != '\n'; i += 1)
|
|
if (data[i] != ' ' && data[i] != '\t') return 0;
|
|
return i + 1; }
|
|
|
|
|
|
/* is_hrule • returns whether a line is a horizontal rule */
|
|
static int
|
|
is_hrule(char *data, size_t size) {
|
|
size_t i = 0, n = 0;
|
|
char c;
|
|
|
|
/* skipping initial spaces */
|
|
if (size < 3) return 0;
|
|
if (data[0] == ' ') { i += 1;
|
|
if (data[1] == ' ') { i += 1;
|
|
if (data[2] == ' ') { i += 1; } } }
|
|
|
|
/* looking at the hrule char */
|
|
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 += 1;
|
|
else if (data[i] != ' ' && data[i] != '\t')
|
|
return 0;
|
|
i += 1; }
|
|
|
|
return n >= 3; }
|
|
|
|
|
|
/* is_headerline • returns whether the line is a setext-style hdr underline */
|
|
static int
|
|
is_headerline(char *data, size_t size) {
|
|
size_t i = 0;
|
|
|
|
/* test of level 1 header */
|
|
if (data[i] == '=') {
|
|
for (i = 1; i < size && data[i] == '='; i += 1);
|
|
while (i < size && (data[i] == ' ' || data[i] == '\t')) i += 1;
|
|
return (i >= size || data[i] == '\n') ? 1 : 0; }
|
|
|
|
/* test of level 2 header */
|
|
if (data[i] == '-') {
|
|
for (i = 1; i < size && data[i] == '-'; i += 1);
|
|
while (i < size && (data[i] == ' ' || data[i] == '\t')) i += 1;
|
|
return (i >= size || data[i] == '\n') ? 2 : 0; }
|
|
|
|
return 0; }
|
|
|
|
|
|
/* is_table_sep • returns whether there is a table separator at the given pos */
|
|
static int
|
|
is_table_sep(char *data, size_t pos) {
|
|
return data[pos] == '|' && (pos == 0 || data[pos - 1] != '\\'); }
|
|
|
|
|
|
/* is_tableline • returns the number of column tables in the given line */
|
|
static int
|
|
is_tableline(char *data, size_t size) {
|
|
size_t i = 0;
|
|
int n_sep = 0, outer_sep = 0;
|
|
|
|
/* skip initial blanks */
|
|
while (i < size && (data[i] == ' ' || data[i] == '\t'))
|
|
i += 1;
|
|
|
|
/* check for initial '|' */
|
|
if (i < size && data[i] == '|')
|
|
outer_sep += 1;
|
|
|
|
/* count the number of pipes in the line */
|
|
for (n_sep = 0; i < size && data[i] != '\n'; i += 1)
|
|
if (is_table_sep(data, i))
|
|
n_sep += 1;
|
|
|
|
/* march back to check for optional last '|' before blanks and EOL */
|
|
while (i
|
|
&& (data[i - 1] == ' ' || data[i - 1] == '\t' || data[i - 1] == '\n'))
|
|
i -= 1;
|
|
if (i && is_table_sep(data, i - 1))
|
|
outer_sep += 1;
|
|
|
|
/* return the number of column or 0 if it's not a table line */
|
|
return (n_sep > 0) ? (n_sep - outer_sep + 1) : 0; }
|
|
|
|
|
|
/* prefix_quote • returns blockquote prefix length */
|
|
static size_t
|
|
prefix_quote(char *data, size_t size) {
|
|
size_t i = 0;
|
|
if (i < size && data[i] == ' ') i += 1;
|
|
if (i < size && data[i] == ' ') i += 1;
|
|
if (i < size && data[i] == ' ') i += 1;
|
|
if (i < size && data[i] == '>') {
|
|
if (i + 1 < size && (data[i + 1] == ' ' || data[i+1] == '\t'))
|
|
return i + 2;
|
|
else return i + 1; }
|
|
else return 0; }
|
|
|
|
|
|
/* prefix_code • returns prefix length for block code */
|
|
static size_t
|
|
prefix_code(char *data, size_t size) {
|
|
if (size > 0 && data[0] == '\t') return 1;
|
|
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(char *data, size_t size) {
|
|
size_t i = 0;
|
|
if (i < size && data[i] == ' ') i += 1;
|
|
if (i < size && data[i] == ' ') i += 1;
|
|
if (i < size && data[i] == ' ') i += 1;
|
|
if (i >= size || data[i] < '0' || data[i] > '9') return 0;
|
|
while (i < size && data[i] >= '0' && data[i] <= '9') i += 1;
|
|
if (i + 1 >= size || data[i] != '.'
|
|
|| (data[i + 1] != ' ' && data[i + 1] != '\t')) return 0;
|
|
i = i + 2;
|
|
while (i < size && (data[i] == ' ' || data[i] == '\t')) i += 1;
|
|
return i; }
|
|
|
|
|
|
/* prefix_uli • returns ordered list item prefix */
|
|
static size_t
|
|
prefix_uli(char *data, size_t size) {
|
|
size_t i = 0;
|
|
if (i < size && data[i] == ' ') i += 1;
|
|
if (i < size && data[i] == ' ') i += 1;
|
|
if (i < size && data[i] == ' ') i += 1;
|
|
if (i + 1 >= size
|
|
|| (data[i] != '*' && data[i] != '+' && data[i] != '-')
|
|
|| (data[i + 1] != ' ' && data[i + 1] != '\t'))
|
|
return 0;
|
|
i = i + 2;
|
|
while (i < size && (data[i] == ' ' || data[i] == '\t')) i += 1;
|
|
return i; }
|
|
|
|
|
|
/* parse_block • parsing of one block, returning next char to parse */
|
|
static void parse_block(struct buf *ob, struct render *rndr,
|
|
char *data, size_t size);
|
|
|
|
|
|
/* parse_blockquote • handles parsing of a blockquote fragment */
|
|
static size_t
|
|
parse_blockquote(struct buf *ob, struct render *rndr,
|
|
char *data, size_t size) {
|
|
size_t beg, end = 0, pre, work_size = 0;
|
|
char *work_data = 0;
|
|
struct buf *out = new_work_buffer(rndr);
|
|
|
|
beg = 0;
|
|
while (beg < size) {
|
|
for (end = beg + 1; end < size && data[end - 1] != '\n';
|
|
end += 1);
|
|
pre = prefix_quote(data + beg, end - beg);
|
|
if (pre) beg += pre; /* skipping prefix */
|
|
else if (is_empty(data + beg, end - beg)
|
|
&& (end >= size || (prefix_quote(data + end, size - end) == 0
|
|
&& !is_empty(data + end, size - end))))
|
|
/* empty line followed by non-quote line */
|
|
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->make.blockquote)
|
|
rndr->make.blockquote(ob, out, rndr->make.opaque);
|
|
release_work_buffer(rndr, out);
|
|
return end; }
|
|
|
|
|
|
/* parse_paragraph • handles parsing of a regular paragraph */
|
|
static size_t
|
|
parse_paragraph(struct buf *ob, struct render *rndr,
|
|
char *data, size_t size) {
|
|
size_t i = 0, end = 0;
|
|
int level = 0;
|
|
struct buf work = { data, 0, 0, 0, 0 }; /* volatile working buffer */
|
|
|
|
while (i < size) {
|
|
for (end = i + 1; end < size && data[end - 1] != '\n';
|
|
end += 1);
|
|
if (is_empty(data + i, size - i)
|
|
|| (level = is_headerline(data + i, size - i)) != 0)
|
|
break;
|
|
if ((i && data[i] == '#')
|
|
|| is_hrule(data + i, size - i)) {
|
|
end = i;
|
|
break; }
|
|
i = end; }
|
|
|
|
work.size = i;
|
|
while (work.size && data[work.size - 1] == '\n')
|
|
work.size -= 1;
|
|
if (!level) {
|
|
struct buf *tmp = new_work_buffer(rndr);
|
|
parse_inline(tmp, rndr, work.data, work.size);
|
|
if (rndr->make.paragraph)
|
|
rndr->make.paragraph(ob, tmp, rndr->make.opaque);
|
|
release_work_buffer(rndr, tmp); }
|
|
else {
|
|
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) {
|
|
struct buf *tmp = new_work_buffer(rndr);
|
|
parse_inline(tmp, rndr, work.data, work.size);
|
|
if (rndr->make.paragraph)
|
|
rndr->make.paragraph(ob, tmp,
|
|
rndr->make.opaque);
|
|
release_work_buffer(rndr, tmp);
|
|
work.data += beg;
|
|
work.size = i - beg; }
|
|
else work.size = i; }
|
|
if (rndr->make.header) {
|
|
struct buf *span = new_work_buffer(rndr);
|
|
parse_inline(span, rndr, work.data, work.size);
|
|
rndr->make.header(ob, span, level,rndr->make.opaque);
|
|
release_work_buffer(rndr, span); } }
|
|
return end; }
|
|
|
|
|
|
/* parse_blockcode • handles parsing of a block-level code fragment */
|
|
static size_t
|
|
parse_blockcode(struct buf *ob, struct render *rndr,
|
|
char *data, size_t size) {
|
|
size_t beg, end, pre;
|
|
struct buf *work = new_work_buffer(rndr);
|
|
|
|
beg = 0;
|
|
while (beg < size) {
|
|
for (end = beg + 1; end < size && data[end - 1] != '\n';
|
|
end += 1);
|
|
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->make.blockcode)
|
|
rndr->make.blockcode(ob, work, rndr->make.opaque);
|
|
release_work_buffer(rndr, work);
|
|
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 render *rndr,
|
|
char *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;
|
|
|
|
/* keeping book of the first indentation prefix */
|
|
if (size > 1 && data[0] == ' ') { orgpre = 1;
|
|
if (size > 2 && data[1] == ' ') { orgpre = 2;
|
|
if (size > 3 && data[2] == ' ') { orgpre = 3; } } }
|
|
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 += 1;
|
|
|
|
/* getting working buffers */
|
|
work = new_work_buffer(rndr);
|
|
inter = new_work_buffer(rndr);
|
|
|
|
/* putting the first line into the working buffer */
|
|
bufput(work, data + beg, end - beg);
|
|
beg = end;
|
|
|
|
/* process the following lines */
|
|
while (beg < size) {
|
|
end += 1;
|
|
while (end < size && data[end - 1] != '\n') end += 1;
|
|
|
|
/* process an empty line */
|
|
if (is_empty(data + beg, end - beg)) {
|
|
in_empty = 1;
|
|
beg = end;
|
|
continue; }
|
|
|
|
/* calculating the indentation */
|
|
i = 0;
|
|
if (end - beg > 1 && data[beg] == ' ') { i = 1;
|
|
if (end - beg > 2 && data[beg + 1] == ' ') { i = 2;
|
|
if (end - beg > 3 && data[beg + 2] == ' ') { i = 3;
|
|
if (end - beg > 3 && data[beg + 3] == ' ') { i = 4; } } } }
|
|
pre = i;
|
|
if (data[beg] == '\t') { i = 1; pre = 8; }
|
|
|
|
/* checking for a new item */
|
|
if ((prefix_uli(data + beg + i, end - beg - i)
|
|
&& !is_hrule(data + beg + i, end - beg - i))
|
|
|| prefix_oli(data + beg + i, end - beg - i)) {
|
|
if (in_empty) has_inside_empty = 1;
|
|
if (pre == orgpre) /* the following item must have */
|
|
break; /* the same indentation */
|
|
if (!sublist) sublist = work->size;
|
|
else if (in_empty) bufputc(work, '\n'); }
|
|
|
|
/* joining only indented stuff after empty lines */
|
|
else if (in_empty && i < 4 && data[beg] != '\t') {
|
|
*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->make.listitem)
|
|
rndr->make.listitem(ob, inter, *flags, rndr->make.opaque);
|
|
release_work_buffer(rndr, inter);
|
|
release_work_buffer(rndr, work);
|
|
return beg; }
|
|
|
|
|
|
/* parse_list • parsing ordered or unordered list block */
|
|
static size_t
|
|
parse_list(struct buf *ob, struct render *rndr,
|
|
char *data, size_t size, int flags) {
|
|
struct buf *work = new_work_buffer(rndr);
|
|
size_t i = 0, j;
|
|
|
|
while (i < size) {
|
|
j = parse_listitem(work, rndr, data + i, size - i, &flags);
|
|
i += j;
|
|
if (!j || (flags & MKD_LI_END)) break; }
|
|
|
|
if (rndr->make.list)
|
|
rndr->make.list(ob, work, flags, rndr->make.opaque);
|
|
release_work_buffer(rndr, work);
|
|
return i; }
|
|
|
|
|
|
/* parse_atxheader • parsing of atx-style headers */
|
|
static size_t
|
|
parse_atxheader(struct buf *ob, struct render *rndr,
|
|
char *data, size_t size) {
|
|
int level = 0;
|
|
size_t i, end, skip, span_beg, span_size;
|
|
|
|
if (!size || data[0] != '#') return 0;
|
|
|
|
while (level < size && level < 6 && data[level] == '#') level += 1;
|
|
for (i = level; i < size && (data[i] == ' ' || data[i] == '\t');
|
|
i += 1);
|
|
span_beg = i;
|
|
|
|
for (end = i; end < size && data[end] != '\n'; end += 1);
|
|
skip = end;
|
|
if (end <= i)
|
|
return parse_paragraph(ob, rndr, data, size);
|
|
while (end && data[end - 1] == '#') end -= 1;
|
|
while (end && (data[end - 1] == ' ' || data[end - 1] == '\t')) end -= 1;
|
|
if (end <= i)
|
|
return parse_paragraph(ob, rndr, data, size);
|
|
|
|
span_size = end - span_beg;
|
|
if (rndr->make.header) {
|
|
struct buf *span = new_work_buffer(rndr);
|
|
parse_inline(span, rndr, data + span_beg, span_size);
|
|
rndr->make.header(ob, span, level, rndr->make.opaque);
|
|
release_work_buffer(rndr, 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(struct html_tag *tag, char *data, size_t size) {
|
|
size_t i, w;
|
|
|
|
/* assuming data[0] == '<' && data[1] == '/' already tested */
|
|
|
|
/* checking tag is a match */
|
|
if (tag->size + 3 >= size
|
|
|| strncasecmp(data + 2, tag->text, tag->size)
|
|
|| data[tag->size + 2] != '>')
|
|
return 0;
|
|
|
|
/* checking white lines */
|
|
i = tag->size + 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)) == 0)
|
|
return 0; /* non-blank line after tag line */
|
|
return i + w; }
|
|
|
|
|
|
/* parse_htmlblock • parsing of inline HTML block */
|
|
static size_t
|
|
parse_htmlblock(struct buf *ob, struct render *rndr,
|
|
char *data, size_t size) {
|
|
size_t i, j = 0;
|
|
struct html_tag *curtag;
|
|
int found;
|
|
struct buf work = { data, 0, 0, 0, 0 };
|
|
|
|
/* identification of the opening tag */
|
|
if (size < 2 || data[0] != '<') return 0;
|
|
curtag = find_block_tag(data + 1, size - 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 += 1;
|
|
i += 1;
|
|
if (i < size) {
|
|
j = is_empty(data + i, size - i);
|
|
if (j) {
|
|
work.size = i + j;
|
|
if (rndr->make.blockhtml)
|
|
rndr->make.blockhtml(ob, &work,
|
|
rndr->make.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 += 1;
|
|
if (i + 1 < size) {
|
|
i += 1;
|
|
j = is_empty(data + i, size - i);
|
|
if (j) {
|
|
work.size = i + j;
|
|
if (rndr->make.blockhtml)
|
|
rndr->make.blockhtml(ob, &work,
|
|
rndr->make.opaque);
|
|
return work.size; } } }
|
|
|
|
/* no special case recognised */
|
|
return 0; }
|
|
|
|
/* looking for an unindented matching closing tag */
|
|
/* followed by a blank line */
|
|
i = 1;
|
|
found = 0;
|
|
#if 0
|
|
while (i < size) {
|
|
i += 1;
|
|
while (i < size && !(data[i - 2] == '\n'
|
|
&& data[i - 1] == '<' && data[i] == '/'))
|
|
i += 1;
|
|
if (i + 2 + curtag->size >= size) break;
|
|
j = htmlblock_end(curtag, data + i - 1, size - i + 1);
|
|
if (j) {
|
|
i += j - 1;
|
|
found = 1;
|
|
break; } }
|
|
#endif
|
|
|
|
/* if not found, trying a second pass looking for indented match */
|
|
/* but not if tag is "ins" or "del" (following original Markdown.pl) */
|
|
if (!found && curtag != INS_TAG && curtag != DEL_TAG) {
|
|
i = 1;
|
|
while (i < size) {
|
|
i += 1;
|
|
while (i < size
|
|
&& !(data[i - 1] == '<' && data[i] == '/'))
|
|
i += 1;
|
|
if (i + 2 + curtag->size >= size) break;
|
|
j = htmlblock_end(curtag, data + i - 1, size - i + 1);
|
|
if (j) {
|
|
i += j - 1;
|
|
found = 1;
|
|
break; } } }
|
|
|
|
if (!found) return 0;
|
|
|
|
/* the end of the block has been found */
|
|
work.size = i;
|
|
if (rndr->make.blockhtml)
|
|
rndr->make.blockhtml(ob, &work, rndr->make.opaque);
|
|
return i; }
|
|
|
|
|
|
/* parse_table_cell • parse a cell inside a table */
|
|
static void
|
|
parse_table_cell(struct buf *ob, struct render *rndr, char *data, size_t size,
|
|
int flags) {
|
|
struct buf *span = new_work_buffer(rndr);
|
|
parse_inline(span, rndr, data, size);
|
|
rndr->make.table_cell(ob, span, flags, rndr->make.opaque);
|
|
release_work_buffer(rndr, span); }
|
|
|
|
|
|
/* parse_table_row • parse an input line into a table row */
|
|
static size_t
|
|
parse_table_row(struct buf *ob, struct render *rndr, char *data, size_t size,
|
|
int *aligns, size_t align_size, int flags) {
|
|
size_t i = 0, col = 0;
|
|
size_t beg, end, total = 0;
|
|
struct buf *cells = new_work_buffer(rndr);
|
|
int align;
|
|
|
|
/* skip leading blanks and separator */
|
|
while (i < size && (data[i] == ' ' || data[i] == '\t'))
|
|
i += 1;
|
|
if (i < size && data[i] == '|')
|
|
i += 1;
|
|
|
|
/* go over all the cells */
|
|
while (i < size && total == 0) {
|
|
/* check optional left/center align marker */
|
|
align = 0;
|
|
if (data[i] == ':') {
|
|
align |= MKD_CELL_ALIGN_LEFT;
|
|
i += 1; }
|
|
|
|
/* skip blanks */
|
|
while (i < size && (data[i] == ' ' || data[i] == '\t'))
|
|
i += 1;
|
|
beg = i;
|
|
|
|
/* forward to the next separator or EOL */
|
|
while (i < size && !is_table_sep(data, i) && data[i] != '\n')
|
|
i += 1;
|
|
end = i;
|
|
if (i < size) {
|
|
i += 1;
|
|
if (data[i - 1] == '\n')
|
|
total = i; }
|
|
|
|
/* check optional right/center align marker */
|
|
if (i > beg && data[end - 1] == ':') {
|
|
align |= MKD_CELL_ALIGN_RIGHT;
|
|
end -= 1; }
|
|
|
|
/* remove trailing blanks */
|
|
while (end > beg
|
|
&& (data[end - 1] == ' ' || data[end - 1] == '\t'))
|
|
end -= 1;
|
|
|
|
/* skip the last cell if it was only blanks */
|
|
/* (because it is only the optional end separator) */
|
|
if (total && end <= beg) continue;
|
|
|
|
/* fallback on default alignment if not explicit */
|
|
if (align == 0 && aligns && col < align_size)
|
|
align = aligns[col];
|
|
|
|
/* render cells */
|
|
parse_table_cell(cells, rndr, data + beg, end - beg,
|
|
align | flags);
|
|
|
|
col += 1; }
|
|
|
|
/* render the whole row and clean up */
|
|
rndr->make.table_row(ob, cells, flags, rndr->make.opaque);
|
|
release_work_buffer(rndr, cells);
|
|
return total ? total : size; }
|
|
|
|
|
|
/* parse_table • parsing of a whole table */
|
|
static size_t
|
|
parse_table(struct buf *ob, struct render *rndr, char *data, size_t size) {
|
|
size_t i = 0, head_end, col;
|
|
size_t align_size = 0;
|
|
int *aligns = 0;
|
|
struct buf *head = 0;
|
|
struct buf *rows = new_work_buffer(rndr);
|
|
|
|
/* skip the first (presumably header) line */
|
|
while (i < size && data[i] != '\n')
|
|
i += 1;
|
|
head_end = i;
|
|
|
|
/* fallback on end of input */
|
|
if (i >= size) {
|
|
parse_table_row(rows, rndr, data, size, 0, 0, 0);
|
|
rndr->make.table(ob, 0, rows, rndr->make.opaque);
|
|
release_work_buffer(rndr, rows);
|
|
return i; }
|
|
|
|
/* attempt to parse a table rule, i.e. blanks, dash, colons and sep */
|
|
i += 1;
|
|
col = 0;
|
|
while (i < size && (data[i] == ' ' || data[i] == '\t' || data[i] == '-'
|
|
|| data[i] == ':' || data[i] == '|')) {
|
|
if (data[i] == '|') align_size += 1;
|
|
if (data[i] == ':') col = 1;
|
|
i += 1; }
|
|
|
|
if (i < size && data[i] == '\n') {
|
|
align_size += 1;
|
|
|
|
/* render the header row */
|
|
head = new_work_buffer(rndr);
|
|
parse_table_row(head, rndr, data, head_end, 0, 0,
|
|
MKD_CELL_HEAD);
|
|
|
|
/* parse alignments if provided */
|
|
if (col && (aligns = malloc(align_size * sizeof *aligns)) != 0){
|
|
for (i = 0; i < align_size; i += 1)
|
|
aligns[i] = 0;
|
|
col = 0;
|
|
i = head_end + 1;
|
|
|
|
/* skip initial white space and optional separator */
|
|
while (i < size && (data[i] == ' ' || data[i] == '\t'))
|
|
i += 1;
|
|
if (data[i] == '|') i += 1;
|
|
|
|
/* compute default alignment for each column */
|
|
while (i < size && data[i] != '\n') {
|
|
if (data[i] == ':')
|
|
aligns[col] |= MKD_CELL_ALIGN_LEFT;
|
|
while (i < size
|
|
&& data[i] != '|' && data[i] != '\n')
|
|
i += 1;
|
|
if (data[i - 1] == ':')
|
|
aligns[col] |= MKD_CELL_ALIGN_RIGHT;
|
|
if (i < size && data[i] == '|')
|
|
i += 1;
|
|
col += 1; } }
|
|
|
|
/* point i to the beginning of next line/row */
|
|
i += 1; }
|
|
|
|
else {
|
|
/* there is no valid ruler, continuing without header */
|
|
i = 0; }
|
|
|
|
/* render the table body lines */
|
|
while (i < size && is_tableline(data + i, size - i))
|
|
i += parse_table_row(rows, rndr, data + i, size - i,
|
|
aligns, align_size, 0);
|
|
|
|
/* render the full table */
|
|
rndr->make.table(ob, head, rows, rndr->make.opaque);
|
|
|
|
/* cleanup */
|
|
if (head) release_work_buffer(rndr, head);
|
|
release_work_buffer(rndr, rows);
|
|
free(aligns);
|
|
return i; }
|
|
|
|
|
|
/* parse_block • parsing of one block, returning next char to parse */
|
|
static void
|
|
parse_block(struct buf *ob, struct render *rndr,
|
|
char *data, size_t size) {
|
|
size_t beg, end, i;
|
|
char *txt_data;
|
|
int has_table = (rndr->make.table && rndr->make.table_row
|
|
&& rndr->make.table_cell);
|
|
|
|
if (rndr->work.size > rndr->make.max_work_stack) {
|
|
if (size)
|
|
{
|
|
// rg
|
|
if (rndr->make.normal_text)
|
|
{
|
|
struct buf work;
|
|
work.data = data;
|
|
work.size = size;
|
|
rndr->make.normal_text(ob, &work, rndr->make.opaque);
|
|
}
|
|
else
|
|
{
|
|
bufput(ob, data, size);
|
|
}
|
|
}
|
|
return; }
|
|
|
|
beg = 0;
|
|
while (beg < size) {
|
|
txt_data = data + beg;
|
|
end = size - beg;
|
|
if (data[beg] == '#')
|
|
beg += parse_atxheader(ob, rndr, txt_data, end);
|
|
else if (data[beg] == '<' && rndr->make.blockhtml
|
|
&& (i = parse_htmlblock(ob, rndr, txt_data, end)) != 0)
|
|
beg += i;
|
|
else if ((i = is_empty(txt_data, end)) != 0)
|
|
beg += i;
|
|
else if (is_hrule(txt_data, end)) {
|
|
if (rndr->make.hrule)
|
|
rndr->make.hrule(ob, rndr->make.opaque);
|
|
while (beg < size && data[beg] != '\n') beg += 1;
|
|
beg += 1; }
|
|
else if (prefix_quote(txt_data, end))
|
|
beg += parse_blockquote(ob, rndr, txt_data, end);
|
|
else if (prefix_code(txt_data, end))
|
|
beg += parse_blockcode(ob, rndr, txt_data, end);
|
|
else if (prefix_uli(txt_data, end))
|
|
beg += parse_list(ob, rndr, txt_data, end, 0);
|
|
else if (prefix_oli(txt_data, end))
|
|
beg += parse_list(ob, rndr, txt_data, end,
|
|
MKD_LIST_ORDERED);
|
|
else if (has_table && is_tableline(txt_data, end))
|
|
beg += parse_table(ob, rndr, txt_data, end);
|
|
else
|
|
beg += parse_paragraph(ob, rndr, txt_data, end); } }
|
|
|
|
|
|
|
|
/*********************
|
|
* REFERENCE PARSING *
|
|
*********************/
|
|
|
|
/* is_ref • returns whether a line is a reference or not */
|
|
static int
|
|
is_ref(char *data, size_t beg, size_t end, size_t *last, struct array *refs) {
|
|
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;
|
|
struct link_ref *lr;
|
|
struct buf *id;
|
|
|
|
/* 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 += 1;
|
|
id_offset = i;
|
|
while (i < end && data[i] != '\n' && data[i] != '\r' && data[i] != ']')
|
|
i += 1;
|
|
if (i >= end || data[i] != ']') return 0;
|
|
id_end = i;
|
|
|
|
/* spacer: colon (space | tab)* newline? (space | tab)* */
|
|
i += 1;
|
|
if (i >= end || data[i] != ':') return 0;
|
|
i += 1;
|
|
while (i < end && (data[i] == ' ' || data[i] == '\t')) i += 1;
|
|
if (i < end && (data[i] == '\n' || data[i] == '\r')) {
|
|
i += 1;
|
|
if (i < end && data[i] == '\r' && data[i - 1] == '\n') i += 1; }
|
|
while (i < end && (data[i] == ' ' || data[i] == '\t')) i += 1;
|
|
if (i >= end) return 0;
|
|
|
|
/* link: whitespace-free sequence, optionally between angle brackets */
|
|
if (data[i] == '<') i += 1;
|
|
link_offset = i;
|
|
while (i < end && data[i] != ' ' && data[i] != '\t'
|
|
&& data[i] != '\n' && data[i] != '\r') i += 1;
|
|
if (data[i - 1] == '>') link_end = i - 1;
|
|
else link_end = i;
|
|
|
|
/* optional spacer: (space | tab)* (newline | '\'' | '"' | '(' ) */
|
|
while (i < end && (data[i] == ' ' || data[i] == '\t')) i += 1;
|
|
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] == ' ' || data[i] == '\t')) i += 1; }
|
|
|
|
/* 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 += 1;
|
|
title_offset = i;
|
|
/* looking for EOL */
|
|
while (i < end && data[i] != '\n' && data[i] != '\r') i += 1;
|
|
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] == ' ' || data[i] == '\t'))
|
|
i -= 1;
|
|
if (i > title_offset
|
|
&& (data[i] == '\'' || data[i] == '"' || data[i] == ')')) {
|
|
line_end = title_end;
|
|
title_end = i; } }
|
|
if (!line_end) return 0; /* garbage after the link */
|
|
|
|
/* a valid ref has been found, filling-in return structures */
|
|
if (last) *last = line_end;
|
|
if (!refs) return 1;
|
|
id = bufnew(WORK_UNIT);
|
|
if (build_ref_id(id, data + id_offset, id_end - id_offset) < 0) {
|
|
bufrelease(id);
|
|
return 0; }
|
|
lr = arr_item(refs, arr_newitem(refs));
|
|
lr->id = id;
|
|
lr->link = bufnew(link_end - link_offset);
|
|
bufput(lr->link, data + link_offset, link_end - link_offset);
|
|
if (title_end > title_offset) {
|
|
lr->title = bufnew(title_end - title_offset);
|
|
bufput(lr->title, data + title_offset,
|
|
title_end - title_offset); }
|
|
else lr->title = 0;
|
|
return 1; }
|
|
|
|
|
|
|
|
/**********************
|
|
* EXPORTED FUNCTIONS *
|
|
**********************/
|
|
|
|
/* markdown • parses the input buffer and renders it into the output buffer */
|
|
void
|
|
markdown(struct buf *ob, struct buf *ib, const struct mkd_renderer *rndrer) {
|
|
struct link_ref *lr;
|
|
struct buf *text;
|
|
size_t i, beg, end;
|
|
struct render rndr;
|
|
|
|
/* filling the render structure */
|
|
if (!rndrer) return;
|
|
rndr.make = *rndrer;
|
|
if (rndr.make.max_work_stack < 1)
|
|
rndr.make.max_work_stack = 1;
|
|
arr_init(&rndr.refs, sizeof (struct link_ref));
|
|
parr_init(&rndr.work);
|
|
for (i = 0; i < 256; i += 1) rndr.active_char[i] = 0;
|
|
if ((rndr.make.emphasis || rndr.make.double_emphasis
|
|
|| rndr.make.triple_emphasis)
|
|
&& rndr.make.emph_chars)
|
|
for (i = 0; rndr.make.emph_chars[i]; i += 1)
|
|
rndr.active_char[(unsigned char)rndr.make.emph_chars[i]]
|
|
= char_emphasis;
|
|
if (rndr.make.codespan) rndr.active_char['`'] = char_codespan;
|
|
if (rndr.make.linebreak) rndr.active_char['\n'] = char_linebreak;
|
|
if (rndr.make.image || rndr.make.link)
|
|
rndr.active_char['['] = char_link;
|
|
rndr.active_char['<'] = char_langle_tag;
|
|
rndr.active_char['\\'] = char_escape;
|
|
rndr.active_char['&'] = char_entity;
|
|
|
|
/* first pass: looking for references, copying everything else */
|
|
text = bufnew(TEXT_UNIT);
|
|
beg = 0;
|
|
while (beg < ib->size) /* iterating over lines */
|
|
if (is_ref(ib->data, beg, ib->size, &end, &rndr.refs))
|
|
beg = end;
|
|
else { /* skipping to the next line */
|
|
end = beg;
|
|
while (end < ib->size
|
|
&& ib->data[end] != '\n' && ib->data[end] != '\r')
|
|
end += 1;
|
|
/* adding the line body if present */
|
|
if (end > beg) bufput(text, ib->data + beg, end - beg);
|
|
while (end < ib->size
|
|
&& (ib->data[end] == '\n' || ib->data[end] == '\r')) {
|
|
/* add one \n per newline */
|
|
if (ib->data[end] == '\n'
|
|
|| (end + 1 < ib->size
|
|
&& ib->data[end + 1] != '\n'))
|
|
bufputc(text, '\n');
|
|
end += 1; }
|
|
beg = end; }
|
|
|
|
/* sorting the reference array */
|
|
if (rndr.refs.size)
|
|
qsort(rndr.refs.base, rndr.refs.size, rndr.refs.unit,
|
|
cmp_link_ref_sort);
|
|
|
|
/* adding a final newline if not already present */
|
|
if (text->size
|
|
&& text->data[text->size - 1] != '\n'
|
|
&& text->data[text->size - 1] != '\r')
|
|
bufputc(text, '\n');
|
|
|
|
/* second pass: actual rendering */
|
|
if (rndr.make.prolog)
|
|
rndr.make.prolog(ob, rndr.make.opaque);
|
|
parse_block(ob, &rndr, text->data, text->size);
|
|
if (rndr.make.epilog)
|
|
rndr.make.epilog(ob, rndr.make.opaque);
|
|
|
|
/* clean-up */
|
|
bufrelease(text);
|
|
lr = rndr.refs.base;
|
|
for (i = 0; i < rndr.refs.size; i += 1) {
|
|
bufrelease(lr[i].id);
|
|
bufrelease(lr[i].link);
|
|
bufrelease(lr[i].title); }
|
|
arr_free(&rndr.refs);
|
|
assert(rndr.work.size == 0);
|
|
for (i = 0; i < rndr.work.asize; i += 1)
|
|
bufrelease(rndr.work.item[i]);
|
|
parr_free(&rndr.work); }
|
|
|
|
/* vim: set filetype=c: */
|