markdown.h

#ifndef _MARKDOWN_D
#define _MARKDOWN_D

#include "cstring.h"

/* reference-style links (and images) are stored in an array
 * of footnotes.
 */
typedef struct footnote {
	Cstring tag;				/* the tag for the reference link */
	Cstring link;				/* what this footnote points to */
	Cstring title;				/* what it's called (TITLE= attribute) */
	int height, width;			/* dimensions (for image link) */
	int dealloc;				/* deallocation needed? */
	int refnumber;
	int flags;
#define EXTRA_BOOKMARK	0x01
#define REFERENCED		0x02
} Footnote;

/* each input line is read into a Line, which contains the line,
 * the offset of the first non-space character [this assumes 
 * that all tabs will be expanded to spaces!], and a pointer to
 * the next line.
 */
typedef enum { chk_text, chk_code,
			   chk_hr, chk_dash,
			   chk_tilde, chk_backtick,
			   chk_equal, chk_dollar } line_type;
typedef struct line {
	Cstring text;
	struct line *next;
	int dle;					/* leading indent on the line */
	int flags;					/* special attributes for this line */
#define PIPECHAR		0x01			/* line contains a | */
#define CHECKED			0x02

	line_type kind;
	int count;
} Line;


/* a paragraph is a collection of Lines, with links to the next paragraph
 * and (if it's a QUOTE, UL, or OL) to the reparsed contents of this
 * paragraph.
 */
typedef struct paragraph {
	struct paragraph *next;		/* next paragraph */
	struct paragraph *down;		/* recompiled contents of this paragraph */
	struct line *text;			/* all the text in this paragraph */
	char *ident;				/* %id% tag for QUOTE */
	enum { WHITESPACE=0, CODE, LATEX, QUOTE, MARKUP,
		   HTML, STYLE, DL, UL, OL, AL, OL_i, OL_I, OL_a, OL_A, LISTITEM,
		   HDR, HR, TABLE, SOURCE } typ;
	enum { IMPLICIT=0, PARA, CENTER} align;
	int hnumber;				/* <Hn> for typ == HDR */
} Paragraph;

enum { ETX, SETEXT };	/* header types */


typedef struct block {
	enum { bTEXT, bSTAR, bUNDER } b_type;
	int	 b_count;
	char b_char;
	Cstring b_text;
	Cstring b_post;
} block;

typedef STRING(block) Qblock;


typedef char* (*mkd_callback_t)(const char*, const int, void*);
typedef void  (*mkd_free_t)(char*, void*);

typedef struct callback_data {
	void *e_data;				/* private data for callbacks */
	mkd_callback_t e_url;		/* url edit callback */
	mkd_callback_t e_flags;		/* extra href flags callback */
	mkd_free_t e_free;			/* edit/flags callback memory deallocator */
} Callback_data;


struct escaped { 
	char *text;
	struct escaped *up;
} ;


/* a magic markdown io thing holds all the data structures needed to
 * do the backend processing of a markdown document
 */
typedef struct mmiot {
	Cstring out;
	Cstring in;
	Qblock Q;
	int isp;
	int reference;
	struct escaped *esc;
	char *ref_prefix;
	STRING(Footnote) *footnotes;
	DWORD flags;
#define MKD_NOLINKS		0x00000001
#define MKD_NOIMAGE		0x00000002
#define MKD_NOPANTS		0x00000004
#define MKD_NOHTML		0x00000008
#define MKD_STRICT		0x00000010
#define MKD_TAGTEXT		0x00000020
#define MKD_NO_EXT		0x00000040
#define MKD_CDATA		0x00000080
#define MKD_NOSUPERSCRIPT 0x00000100
#define MKD_NORELAXED	0x00000200
#define MKD_NOTABLES	0x00000400
#define MKD_NOSTRIKETHROUGH 0x00000800
#define MKD_TOC			0x00001000
#define MKD_1_COMPAT	0x00002000
#define MKD_AUTOLINK	0x00004000
#define MKD_SAFELINK	0x00008000
#define MKD_NOHEADER	0x00010000
#define MKD_TABSTOP		0x00020000
#define MKD_NODIVQUOTE	0x00040000
#define MKD_NOALPHALIST 0x00080000
#define MKD_NODLIST		0x00100000
#define MKD_EXTRA_FOOTNOTE 0x00200000
#define MKD_NOSTYLE		0x00400000
#define IS_LABEL		0x08000000
#define USER_FLAGS		0x0FFFFFFF
#define INPUT_MASK		(MKD_NOHEADER|MKD_TABSTOP)

	Callback_data *cb;
    int hasLaTeX;
} MMIOT;


/*
 * the mkdio text input functions return a document structure,
 * which contains a header (retrieved from the document if
 * markdown was configured * with the * --enable-pandoc-header
 * and the document begins with a pandoc-style header) and the
 * root of the linked list of Lines.
 */
typedef struct document {
	int magic;					/* "I AM VALID" magic number */
#define VALID_DOCUMENT			0x19600731
	Line *title;
	Line *author;
	Line *date;
	ANCHOR(Line) content;		/* uncompiled text, not valid after compile() */
	Paragraph *code;			/* intermediate code generated by compile() */
	int compiled;				/* set after mkd_compile() */
	int html;					/* set after (internal) htmlify() */
	int tabstop;				/* for properly expanding tabs (ick) */
	char *ref_prefix;
	MMIOT *ctx;					/* backend buffers, flags, and structures */
	Callback_data cb;			/* callback functions & private data */
} Document;


/*
 * economy FILE-type structure for pulling characters out of a
 * fixed-length string.
 */
struct string_stream {
	const char *data;	/* the unread data */
	int	  size;			/* and how much is there? */
} ;


extern int	mkd_firstnonblank(Line *);
extern int	mkd_compile(Document *, DWORD);
extern int	mkd_document(Document *, char **);
extern int	mkd_generatehtml(Document *, FILE *);
extern int	mkd_css(Document *, char **);
extern int	mkd_generatecss(Document *, FILE *);
#define mkd_style mkd_generatecss
extern int	mkd_xml(char *, int , char **);
extern int	mkd_generatexml(char *, int, FILE *);
extern void mkd_cleanup(Document *);
extern int	mkd_line(char *, int, char **, DWORD);
extern int	mkd_generateline(char *, int, FILE*, DWORD);
#define mkd_text mkd_generateline
extern void mkd_basename(Document*, char *);

typedef int (*mkd_sta_function_t)(const int,const void*);
extern void mkd_string_to_anchor(char*,int, mkd_sta_function_t, void*, int);

extern Document *mkd_in(FILE *, DWORD);
extern Document *mkd_string(const char*,int, DWORD);

extern Document *gfm_in(FILE *, DWORD);
extern Document *gfm_string(const char*,int, DWORD);

extern void mkd_initialize();
extern void mkd_shlib_destructor();

extern void mkd_ref_prefix(Document*, char*);

/* internal resource handling functions.
 */
extern void ___mkd_freeLine(Line *);
extern void ___mkd_freeLines(Line *);
extern void ___mkd_freeParagraph(Paragraph *);
extern void ___mkd_freefootnote(Footnote *);
extern void ___mkd_freefootnotes(MMIOT *);
extern void ___mkd_initmmiot(MMIOT *, void *);
extern void ___mkd_freemmiot(MMIOT *, void *);
extern void ___mkd_freeLineRange(Line *, Line *);
extern void ___mkd_xml(char *, int, FILE *);
extern void ___mkd_reparse(char *, int, int, MMIOT*, char*);
extern void ___mkd_emblock(MMIOT*);
extern void ___mkd_tidy(Cstring *);

extern Document *__mkd_new_Document();
extern void __mkd_enqueue(Document*, Cstring *);
extern void __mkd_header_dle(Line *);

extern int	__mkd_io_strget(struct string_stream *);

#endif/*_MARKDOWN_D*/