NAME

lowdown_doc_parse —

parse a Markdown document into an AST

LIBRARY

library “liblowdown”

SYNOPSIS

#include <sys/queue.h>
#include <stdio.h>
#include <lowdown.h>

struct lowdown_node *
lowdown_doc_parse(struct lowdown_doc *doc, size_t *maxn, const char *input, size_t inputsz, struct lowdown_metaq *metaq);

DESCRIPTION

Parse a lowdown(5) document input of length inputsz into an AST with the parser doc. The maxn argument, if not NULL, is set to one greater than the highest node identifier. Its value is undefined if the function returns NULL.

If metaq is not NULL, it is filled in with document metadata (if any). Metadata key names are canonicalised and duplicate names are ignored. The results should be freed with lowdown_metaq_free(3).

This function may be invoked multiple times with a single doc and different input.

RETURN VALUES

Returns the root of the parse tree or NULL on memory allocation failure. If not NULL, the returned node is always of type LOWDOWN_ROOT.

EXAMPLES

The following parses b of length bsz. It first allocates the parser, then the document, then the renderer (HTML is used in this case). Then it passes output to the renderer, prints it, and cleans up resources. On any memory errors, it exits with err(3).

struct lowdown_doc *doc;
struct lowdown_node *n;
struct lowdown_buf *ob;
void *rndr;

if ((doc = lowdown_doc_new(NULL)) == NULL)
	err(1, NULL);
if ((n = lowdown_doc_parse(doc, NULL, b, bsz, NULL)) == NULL)
	err(1, NULL);
if ((rndr = lowdown_html_new(NULL)) == NULL)
	err(1, NULL);
if ((ob = lowdown_buf_new(1024)) == NULL)
	err(1, NULL);
if (!lowdown_html_rndr(ob, rndr, n))
	err(1, NULL);

fwrite(stdout, 1, ob->size, ob->data);

lowdown_buf_free(ob);
lowdown_html_rndr_free(rndr);
lowdown_node_free(n);
lowdown_doc_free(doc);