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351 lines
6.6 KiB
351 lines
6.6 KiB
/*
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* mkdio -- markdown front end input functions
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*
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* Copyright (C) 2007 David L Parsons.
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* The redistribution terms are provided in the COPYRIGHT file that must
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* be distributed with this source code.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include "cstring.h"
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#include "markdown.h"
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#include "amalloc.h"
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typedef ANCHOR(Line) LineAnchor;
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/* create a new blank Document
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*/
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Document*
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__mkd_new_Document()
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{
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Document *ret = calloc(sizeof(Document), 1);
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if ( ret ) {
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if ( ret->ctx = calloc(sizeof(MMIOT), 1) ) {
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ret->magic = VALID_DOCUMENT;
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return ret;
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}
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free(ret);
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}
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return 0;
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}
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/* add a line to the markdown input chain, expanding tabs and
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* noting the presence of special characters as we go.
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*/
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void
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__mkd_enqueue(Document* a, Cstring *line)
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{
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Line *p = calloc(sizeof *p, 1);
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unsigned char c;
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int xp = 0;
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int size = S(*line);
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unsigned char *str = (unsigned char*)T(*line);
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CREATE(p->text);
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ATTACH(a->content, p);
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while ( size-- ) {
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if ( (c = *str++) == '\t' ) {
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/* expand tabs into ->tabstop spaces. We use ->tabstop
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* because the ENTIRE FREAKING COMPUTER WORLD uses editors
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* that don't do ^T/^D, but instead use tabs for indentation,
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* and, of course, set their tabs down to 4 spaces
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*/
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do {
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EXPAND(p->text) = ' ';
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} while ( ++xp % a->tabstop );
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}
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else if ( c >= ' ' ) {
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if ( c == '|' )
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p->flags |= PIPECHAR;
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EXPAND(p->text) = c;
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++xp;
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}
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}
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EXPAND(p->text) = 0;
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S(p->text)--;
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p->dle = mkd_firstnonblank(p);
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}
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/* trim leading blanks from a header line
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*/
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void
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__mkd_header_dle(Line *p)
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{
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CLIP(p->text, 0, 1);
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p->dle = mkd_firstnonblank(p);
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}
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/* build a Document from any old input.
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*/
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typedef int (*getc_func)(void*);
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Document *
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populate(getc_func getc, void* ctx, int flags)
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{
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Cstring line;
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Document *a = __mkd_new_Document();
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int c;
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int pandoc = 0;
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if ( !a ) return 0;
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a->tabstop = (flags & MKD_TABSTOP) ? 4 : TABSTOP;
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CREATE(line);
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while ( (c = (*getc)(ctx)) != EOF ) {
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if ( c == '\n' ) {
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if ( pandoc != EOF && pandoc < 3 ) {
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if ( S(line) && (T(line)[0] == '%') )
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pandoc++;
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else
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pandoc = EOF;
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}
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__mkd_enqueue(a, &line);
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S(line) = 0;
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}
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else if ( isprint(c) || isspace(c) || (c & 0x80) )
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EXPAND(line) = c;
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}
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if ( S(line) )
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__mkd_enqueue(a, &line);
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DELETE(line);
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if ( (pandoc == 3) && !(flags & (MKD_NOHEADER|MKD_STRICT)) ) {
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/* the first three lines started with %, so we have a header.
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* clip the first three lines out of content and hang them
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* off header.
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*/
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Line *headers = T(a->content);
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a->title = headers; __mkd_header_dle(a->title);
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a->author= headers->next; __mkd_header_dle(a->author);
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a->date = headers->next->next; __mkd_header_dle(a->date);
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T(a->content) = headers->next->next->next;
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}
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return a;
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}
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/* convert a file into a linked list
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*/
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Document *
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mkd_in(FILE *f, DWORD flags)
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{
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return populate((getc_func)fgetc, f, flags & INPUT_MASK);
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}
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/* return a single character out of a buffer
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*/
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int
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__mkd_io_strget(struct string_stream *in)
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{
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if ( !in->size ) return EOF;
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--(in->size);
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return *(in->data)++;
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}
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/* convert a block of text into a linked list
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*/
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Document *
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mkd_string(const char *buf, int len, DWORD flags)
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{
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struct string_stream about;
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about.data = buf;
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about.size = len;
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return populate((getc_func)__mkd_io_strget, &about, flags & INPUT_MASK);
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}
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/* write the html to a file (xmlified if necessary)
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*/
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int
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mkd_generatehtml(Document *p, FILE *output)
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{
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char *doc;
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int szdoc;
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if ( (szdoc = mkd_document(p, &doc)) != EOF ) {
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if ( p->ctx->flags & MKD_CDATA )
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mkd_generatexml(doc, szdoc, output);
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else
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fwrite(doc, szdoc, 1, output);
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putc('\n', output);
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return 0;
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}
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return -1;
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}
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/* convert some markdown text to html
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*/
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int
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markdown(Document *document, FILE *out, int flags)
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{
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if ( mkd_compile(document, flags) ) {
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mkd_generatehtml(document, out);
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mkd_cleanup(document);
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return 0;
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}
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return -1;
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}
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/* write out a Cstring, mangled into a form suitable for `<a href=` or `<a id=`
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*/
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void
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mkd_string_to_anchor(char *s, int len, mkd_sta_function_t outchar,
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void *out, int labelformat)
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{
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unsigned char c;
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int i, size;
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char *line;
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size = mkd_line(s, len, &line, IS_LABEL);
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if ( labelformat && (size>0) && !isalpha(line[0]) )
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(*outchar)('L',out);
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for ( i=0; i < size ; i++ ) {
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c = line[i];
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if ( labelformat ) {
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if ( isalnum(c) || (c == '_') || (c == ':') || (c == '-') || (c == '.' ) )
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(*outchar)(c, out);
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else
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(*outchar)('.', out);
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}
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else
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(*outchar)(c,out);
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}
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if (line)
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free(line);
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}
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/* ___mkd_reparse() a line
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*/
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static void
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mkd_parse_line(char *bfr, int size, MMIOT *f, int flags)
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{
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___mkd_initmmiot(f, 0);
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f->flags = flags & USER_FLAGS;
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___mkd_reparse(bfr, size, 0, f, 0);
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___mkd_emblock(f);
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}
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/* ___mkd_reparse() a line, returning it in malloc()ed memory
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*/
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int
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mkd_line(char *bfr, int size, char **res, DWORD flags)
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{
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MMIOT f;
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int len;
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mkd_parse_line(bfr, size, &f, flags);
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if ( len = S(f.out) ) {
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/* kludge alert; we know that T(f.out) is malloced memory,
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* so we can just steal it away. This is awful -- there
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* should be an opaque method that transparently moves
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* the pointer out of the embedded Cstring.
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*/
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EXPAND(f.out) = 0;
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*res = T(f.out);
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T(f.out) = 0;
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S(f.out) = ALLOCATED(f.out) = 0;
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}
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else {
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*res = 0;
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len = EOF;
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}
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___mkd_freemmiot(&f, 0);
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return len;
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}
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/* ___mkd_reparse() a line, writing it to a FILE
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*/
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int
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mkd_generateline(char *bfr, int size, FILE *output, DWORD flags)
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{
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MMIOT f;
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mkd_parse_line(bfr, size, &f, flags);
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if ( flags & MKD_CDATA )
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mkd_generatexml(T(f.out), S(f.out), output);
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else
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fwrite(T(f.out), S(f.out), 1, output);
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___mkd_freemmiot(&f, 0);
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return 0;
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}
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/* set the url display callback
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*/
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void
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mkd_e_url(Document *f, mkd_callback_t edit)
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{
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if ( f )
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f->cb.e_url = edit;
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}
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/* set the url options callback
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*/
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void
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mkd_e_flags(Document *f, mkd_callback_t edit)
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{
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if ( f )
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f->cb.e_flags = edit;
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}
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/* set the url display/options deallocator
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*/
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void
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mkd_e_free(Document *f, mkd_free_t dealloc)
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{
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if ( f )
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f->cb.e_free = dealloc;
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}
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/* set the url display/options context data field
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*/
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void
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mkd_e_data(Document *f, void *data)
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{
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if ( f )
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f->cb.e_data = data;
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}
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/* set the href prefix for markdown extra style footnotes
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*/
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void
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mkd_ref_prefix(Document *f, char *data)
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{
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if ( f )
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f->ref_prefix = data;
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}
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