NAME

soldout_markdown, markdown —

parse markdown document

SYNOPSIS

#include <markdown.h>

#define MKD_CELL_ALIGN_DEFAULT
#define MKD_CELL_ALIGN_LEFT
#define MKD_CELL_ALIGN_RIGHT
#define MKD_CELL_ALIGN_CENTER
#define MKD_CELL_ALIGN_MASK
#define MKD_CELL_HEAD
#define MKD_LIST_ORDERED
#define MKD_LI_BLOCK

void
markdown(struct buf *ob, struct buf *ib, const struct mkd_renderer *rndr);

DESCRIPTION

The markdown() function parses the input buffer ib and renders it into the output buffer ob; rndr is a pointer to the renderer structure.

Function pointers in struct mkd_renderer can be NULL. A null block-level callback will make the corresponding block disappear from the output, as if the callback was an empty function. A null span-level callback will cause the corresponding element to be treated as normal characters, copied verbatim to the output. Moreover, span-level callbacks return an integer, which tells whether the renderer accepts to render the item (non-zero return value) or whether it should be copied verbatim (zero return value).

The first argument of a renderer function is always the output buffer, where the function is supposed to write its output. The last argument of a renderer function is always a private pointer, which is opaque member of struct mkd_renderer. libsoldout itself never does nothing with this data.

emph_chars is a zero-terminated string which contains the set of characters that trigger emphasis. In regular markdown, emphasis is only triggered by ‘_’ and ‘*’, but in some extensions it might be useful to add other characters to this list. The character that triggered the emphasis is then passed to emphasis, double_emphasis and triple_emphasis function callbacks through the parameter c.

The normal_text callback should perform whatever escape is needed to have the output looking like the input data.

libsoldout supports PHP-Markdown-like tables. It uses the following flags: MKD_CELL_ALIGN_DEFAULT, MKD_CELL_ALIGN_LEFT, MKD_CELL_ALIGN_RIGHT, MKD_CELL_ALIGN_CENTER, MKD_CELL_ALIGN_MASK, MKD_CELL_HEAD in these function callbacks: table_cell and table_row.

MKD_LIST_ORDERED, MKD_LI_BLOCK are used as flags in these function callbacks: list and listitem.

Types

enum mkd_autolink

type of autolink:

MKDA_NOT_AUTOLINK: used internally when it is not an autolink.
MKDA_NORMAL: normal http/https/ftp link.
MKDA_EXPLICIT_EMAIL: e-mail link with explicit mailto.
MKDA_IMPLICIT_EMAIL: e-mail link without mailto.

struct mkd_renderer

consists of the following fields:

Document level callbacks

prolog: a pointer to a void function(struct buf *ob, void *opaque);
epilog: a pointer to a void function(struct buf *ob, void *opaque);

Block level callbacks (NULL skips the block)

blockcode: a pointer to a void function(struct buf *ob, struct buf *text, void *opaque);
blockquote: a pointer to a void function(struct buf *ob, struct buf *text, void *opaque);
blockhtml: a pointer to a void function(struct buf *ob, struct buf *text, void *opaque);
header: a pointer to a void function(struct buf *ob, struct buf *text, int level, void *opaque);
hrule: a pointer to a void function(struct buf *ob, void *opaque);
list: a pointer to a void function(struct buf *ob, struct buf *text, int flags, void *opaque);
listitem: a pointer to a void function(struct buf *ob, struct buf *text, int flags, void *opaque);
paragraph: a pointer to a void function(struct buf *ob, struct buf *text, void *opaque);
table: a pointer to a void function(struct buf *ob, struct buf *head_row, struct buf *rows, void *opaque);
table_cell: a pointer to a void function(struct buf *ob, struct buf *text, int flags, void *opaque);
table_row: a pointer to a void function(struct buf *ob, struct buf *cells, int flags, void *opaque);

Span level callbacks (NULL or return 0 prints the span verbatim)

autolink: a pointer to a int function(struct buf *ob, struct buf *link, enum mkd_autolink type, void *opaque);
codespan: a pointer to a int function(struct buf *ob, struct buf *text, void *opaque);
emphasis: a pointer to a int function(struct buf *ob, struct buf *text, char c, void *opaque);
double_emphasis: a pointer to a int function(struct buf *ob, struct buf *text, char c, void *opaque);
triple_emphasis: a pointer to a int function(struct buf *ob, struct buf *text, char c, void *opaque);
image: a pointer to a int function(struct buf *ob, struct buf *link, struct buf *title, struct buf *alt, void *opaque);
linebreak: a pointer to a int function(struct buf *ob, void *opaque);
link: a pointer to a int function(struct buf *ob, struct buf *link, struct buf *title, struct buf *content, void *opaque);
raw_html_tag: a pointer to a int function(struct buf *ob, struct buf *tag, void *opaque);

Low level callbacks (NULL copies input directly into the output)

entity: a pointer to a void function(struct buf *ob, struct buf *entity, void *opaque);
normal_text: a pointer to a void function(struct buf *ob, struct buf *text, void *opaque);

Renderer data

int max_work_stack: prevent arbitrary deep recursion.
const char * emph_chars: chars that trigger emphasis rendering.
void * opaque: opaque data send to every rendering callback.

RETURN VALUES

The markdown() function does not return a value.

AUTHORS

The soldout library was written by Natasha “Kerensikova” Porte <natacha@instinctive.eu>. Manual page was originally written by Massimo Manghi <mxmanghi@apache.org>, and rewritten to mdoc format by Svyatoslav Mishyn <juef@openmailbox.org>.