path: root/man/man3/cmark.3

.TH cmark 3 "December 15, 2014" "LOCAL" "Library Functions Manual"
.SH
NAME
.PP
\f[B]cmark\f[] \- CommonMark parsing, manipulating, and rendering

.SH
DESCRIPTION
.SS
Simple Interface

.PP
.nf
\fC
.RS 0n
#define CMARK_VERSION "0.1"
.RE
\f[]
.fi

.PP
Current version of library.

.PP
\fIchar *\f[] \fBcmark_markdown_to_html\f[](\fIconst char *text\f[], \fIint len\f[])

.PP
Convert \f[I]text\f[] (assumed to be a UTF\-8 encoded string with length
\f[I]len\f[] from CommonMark Markdown to HTML, returning a null\-terminated,
UTF\-8\-encoded string.

.SS
Node Structure

.SS
Creating and Destroying Nodes

.PP
\fIcmark_node*\f[] \fBcmark_node_new\f[](\fIcmark_node_type type\f[])

.PP
Creates a new node of type \f[I]type\f[]\&.  Note that the node may have
other required properties, which it is the caller's responsibility
to assign.

.PP
\fIvoid\f[] \fBcmark_node_free\f[](\fIcmark_node *node\f[])

.PP
Frees the memory allocated for a node.

.SS
Tree Traversal

.PP
\fIcmark_node*\f[] \fBcmark_node_next\f[](\fIcmark_node *node\f[])

.PP
Returns the next node in the sequence after \f[I]node\f[], or NULL if
there is none.

.PP
\fIcmark_node*\f[] \fBcmark_node_previous\f[](\fIcmark_node *node\f[])

.PP
Returns the previous node in the sequence after \f[I]node\f[], or NULL if
there is none.

.PP
\fIcmark_node*\f[] \fBcmark_node_parent\f[](\fIcmark_node *node\f[])

.PP
Returns the parent of \f[I]node\f[], or NULL if there is none.

.PP
\fIcmark_node*\f[] \fBcmark_node_first_child\f[](\fIcmark_node *node\f[])

.PP
Returns the first child of \f[I]node\f[], or NULL if \f[I]node\f[] has no children.

.PP
\fIcmark_node*\f[] \fBcmark_node_last_child\f[](\fIcmark_node *node\f[])

.PP
Returns the last child of \f[I]node\f[], or NULL if \f[I]node\f[] has no children.

.SS
Iterator
.PP
An iterator will walk through a tree of nodes, starting from a root
node, returning one node at a time, together with information about
whether the node is being entered or exited.  The iterator will
first descend to a child node, if there is one.  When there is no
child, the iterator will go to the next sibling.  When there is no
next sibling, the iterator will return to the parent (but with
a \f[I]cmark_event_type\f[] of \f[C]CMARK_EVENT_EXIT\f[]).  The iterator will
return \f[C]CMARK_EVENT_DONE\f[] when it reaches the root node again.
One natural application is an HTML renderer, where an \f[C]ENTER\f[] event
outputs an open tag and an \f[C]EXIT\f[] event outputs a close tag.
An iterator might also be used to transform an AST in some systematic
way, for example, turning all level\-3 headers into regular paragraphs.
.IP
.nf
\f[C]
void
usage_example(cmark_node *root) {
    cmark_event_type ev_type;
    cmark_iter *iter = cmark_iter_new(root);

    while ((ev_type = cmark_iter_next(iter)) != CMARK_EVENT_DONE) {
        cmark_node *cur = cmark_iter_get_node(iter);
        // Do something with `cur` and `ev_type`
    }

    cmark_iter_free(iter);
}
\f[]
.fi

.PP
\fIcmark_iter*\f[] \fBcmark_iter_new\f[](\fIcmark_node *root\f[])

.PP
Creates a new iterator starting at \f[I]root\f[]\&.

.PP
\fIvoid\f[] \fBcmark_iter_free\f[](\fIcmark_iter *iter\f[])

.PP
Frees the memory allocated for an iterator.

.PP
\fIcmark_event_type\f[] \fBcmark_iter_next\f[](\fIcmark_iter *iter\f[])

.PP
Returns the event type (\f[C]CMARK_EVENT_ENTER\f[], \f[C]CMARK_EVENT_EXIT\f[],
or \f[C]CMARK_EVENT_DONE\f[]) for the next node.

.PP
\fIcmark_node*\f[] \fBcmark_iter_get_node\f[](\fIcmark_iter *iter\f[])

.PP
Returns the next node in the sequence described above.

.SS
Accessors

.PP
\fIcmark_node_type\f[] \fBcmark_node_get_type\f[](\fIcmark_node *node\f[])

.PP
Returns the type of \f[I]node\f[], or \f[C]CMARK_NODE_NONE\f[] on error.

.PP
\fIconst char*\f[] \fBcmark_node_get_literal\f[](\fIcmark_node *node\f[])

.PP
Returns the string contents of \f[I]node\f[], or NULL if none.

.PP
\fIint\f[] \fBcmark_node_set_literal\f[](\fIcmark_node *node\f[], \fIconst char *content\f[])

.PP
Sets the string contents of \f[I]node\f[]\&.  Returns 1 on success,
0 on failure.

.PP
\fIint\f[] \fBcmark_node_get_header_level\f[](\fIcmark_node *node\f[])

.PP
Returns the header level of \f[I]node\f[], or 0 if \f[I]node\f[] is not a header.

.PP
\fIint\f[] \fBcmark_node_set_header_level\f[](\fIcmark_node *node\f[], \fIint level\f[])

.PP
Sets the header level of \f[I]node\f[], returning 1 on success and 0 on error.

.PP
\fIcmark_list_type\f[] \fBcmark_node_get_list_type\f[](\fIcmark_node *node\f[])

.PP
Returns the list type of \f[I]node\f[], or \f[C]CMARK_NO_LIST\f[] if \f[I]node\f[]
is not a list.

.PP
\fIint\f[] \fBcmark_node_set_list_type\f[](\fIcmark_node *node\f[], \fIcmark_list_type type\f[])

.PP
Sets the list type of \f[I]node\f[], returning 1 on success and 0 on error.

.PP
\fIint\f[] \fBcmark_node_get_list_start\f[](\fIcmark_node *node\f[])

.PP
Returns starting number of \f[I]node\f[], if it is an ordered list, otherwise 0.

.PP
\fIint\f[] \fBcmark_node_set_list_start\f[](\fIcmark_node *node\f[], \fIint start\f[])

.PP
Sets starting number of \f[I]node\f[], if it is an ordered list. Returns 1
on success, 0 on failure.

.PP
\fIint\f[] \fBcmark_node_get_list_tight\f[](\fIcmark_node *node\f[])

.PP
Returns 1 if \f[I]node\f[] is a tight list, 0 otherwise.

.PP
\fIint\f[] \fBcmark_node_set_list_tight\f[](\fIcmark_node *node\f[], \fIint tight\f[])

.PP
Sets the "tightness" of a list.  Returns 1 on success, 0 on failure.

.PP
\fIconst char*\f[] \fBcmark_node_get_fence_info\f[](\fIcmark_node *node\f[])

.PP
Returns the info string from a fenced code block, or NULL if none.

.PP
\fIint\f[] \fBcmark_node_set_fence_info\f[](\fIcmark_node *node\f[], \fIconst char *info\f[])

.PP
Sets the info string in a fenced code block, returning 1 on
success and 0 on failure.

.PP
\fIconst char*\f[] \fBcmark_node_get_url\f[](\fIcmark_node *node\f[])

.PP
Gets the URL of a link or image \f[I]node\f[], or NULL if none.

.PP
\fIint\f[] \fBcmark_node_set_url\f[](\fIcmark_node *node\f[], \fIconst char *url\f[])

.PP
Sets the URL of a link or image \f[I]node\f[]\&. Returns 1 on success,
0 on failure.

.PP
\fIconst char*\f[] \fBcmark_node_get_title\f[](\fIcmark_node *node\f[])

.PP
Gets the title of a link or image \f[I]node\f[], or NULL if none.

.PP
\fIint\f[] \fBcmark_node_set_title\f[](\fIcmark_node *node\f[], \fIconst char *title\f[])

.PP
Sets the title of a link or image \f[I]node\f[]\&. Returns 1 on success,
0 on failure.

.PP
\fIint\f[] \fBcmark_node_get_start_line\f[](\fIcmark_node *node\f[])

.PP
Returns the line on which \f[I]node\f[] begins.

.PP
\fIint\f[] \fBcmark_node_get_start_column\f[](\fIcmark_node *node\f[])

.PP
Returns the column at which \f[I]node\f[] begins.

.PP
\fIint\f[] \fBcmark_node_get_end_line\f[](\fIcmark_node *node\f[])

.PP
Returns the line on which \f[I]node\f[] ends.

.SS
Tree Manipulation

.PP
\fIvoid\f[] \fBcmark_node_unlink\f[](\fIcmark_node *node\f[])

.PP
Unlinks a \f[I]node\f[], removing it from the tree, but not freeing its
memory.  (Use \f[I]cmark_node_free\f[] for that.)

.PP
\fIint\f[] \fBcmark_node_insert_before\f[](\fIcmark_node *node\f[], \fIcmark_node *sibling\f[])

.PP
Inserts \f[I]sibling\f[] before \f[I]node\f[]\&.  Returns 1 on success, 0 on failure.

.PP
\fIint\f[] \fBcmark_node_insert_after\f[](\fIcmark_node *node\f[], \fIcmark_node *sibling\f[])

.PP
Inserts \f[I]sibling\f[] after \f[I]node\f[]\&. Returns 1 on success, 0 on failure.

.PP
\fIint\f[] \fBcmark_node_prepend_child\f[](\fIcmark_node *node\f[], \fIcmark_node *child\f[])

.PP
Adds \f[I]child\f[] to the beginning of the children of \f[I]node\f[]\&.
Returns 1 on success, 0 on failure.

.PP
\fIint\f[] \fBcmark_node_append_child\f[](\fIcmark_node *node\f[], \fIcmark_node *child\f[])

.PP
Adds \f[I]child\f[] to the end of the children of \f[I]node\f[]\&.
Returns 1 on success, 0 on failure.

.SS
Parsing
.PP
Simple interface:
.IP
.nf
\f[C]
cmark_node *document = cmark_parse_document("Hello *world*", 12);
\f[]
.fi
.PP
Streaming interface:
.IP
.nf
\f[C]
cmark_parser *parser = cmark_parser_new();
FILE *fp = fopen("myfile.md", "r");
while ((bytes = fread(buffer, 1, sizeof(buffer), fp)) > 0) {
       cmark_parser_feed(parser, buffer, bytes);
       if (bytes < sizeof(buffer)) {
           break;
       }
}
document = cmark_parser_finish(parser);
cmark_parser_free(parser);
\f[]
.fi

.PP
\fIcmark_parser *\f[] \fBcmark_parser_new\f[](\fI\f[])

.PP
Creates a new parser object.

.PP
\fIvoid\f[] \fBcmark_parser_free\f[](\fIcmark_parser *parser\f[])

.PP
Frees memory allocated for a parser object.

.PP
\fIvoid\f[] \fBcmark_parser_feed\f[](\fIcmark_parser *parser\f[], \fIconst char *buffer\f[], \fIsize_t len\f[])

.PP
Feeds a string of length \f[I]len\f[] to \f[I]parser\f[]\&.

.PP
\fIcmark_node *\f[] \fBcmark_parser_finish\f[](\fIcmark_parser *parser\f[])

.PP
Finish parsing and return a pointer to a tree of nodes.

.PP
\fIcmark_node *\f[] \fBcmark_parse_document\f[](\fIconst char *buffer\f[], \fIsize_t len\f[])

.PP
Parse a CommonMark document in \f[I]buffer\f[] of length \f[I]len\f[]\&.
Returns a pointer to a tree of nodes.

.PP
\fIcmark_node *\f[] \fBcmark_parse_file\f[](\fIFILE *f\f[])

.PP
Parse a CommonMark document in file \f[I]f\f[], returning a pointer to
a tree of nodes.

.SS
Rendering

.PP
\fIchar *\f[] \fBcmark_render_ast\f[](\fIcmark_node *root\f[])

.PP
Render a \f[I]node\f[] tree for debugging purposes, showing
the hierachy of nodes and their types and contents.

.PP
\fIchar *\f[] \fBcmark_render_html\f[](\fIcmark_node *root\f[])

.PP
Render a \f[I]node\f[] tree as an HTML fragment.  It is up to the user
to add an appropriate header and footer.

.PP
\fIchar *\f[] \fBcmark_render_man\f[](\fIcmark_node *root\f[])

.PP
Render a \f[I]node\f[] tree as a groff man page, without the header.

.SH
AUTHORS
.PP
John MacFarlane, Vicent Marti,  Kārlis Gaņģis, Nick Wellnhofer.