+++ /dev/null
-/*
- * Functions necessary to parse a file and transform its content into
- * a deck of slides containing lines. All based on markdown formating
- * rules.
- * Copyright (C) 2014 Michael Goehler
- *
- * This file is part of mdp.
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- *
- */
-
-#include <ctype.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "include/parser.h"
-
-deck_t *markdown_load(FILE *input) {
-
- int c = 0; // char
- int i = 0; // increment
- int l = 0; // line length
- int hc = 0; // header count
- int lc = 0; // line count
- int sc = 0; // slide count
- int bits = 0; // markdown bits
-
- deck_t *deck = new_deck();
- slide_t *slide = new_slide();
- line_t *line = NULL;
- line_t *tmp = NULL;
- cstring_t *text = cstring_init();
-
- // assign first slide to deck
- deck->slide = slide;
- sc++;
-
- while ((c = fgetc(input)) != EOF) {
- if(c == '\n') {
-
- // markdown analyse
- bits = markdown_analyse(text);
-
- // if first line in file is markdown hr
- if(!line && CHECK_BIT(bits, IS_HR)) {
-
- // clear text
- (text->reset)(text);
-
- // if text is markdown hr
- } else if(CHECK_BIT(bits, IS_HR) &&
- CHECK_BIT(line->bits, IS_EMPTY)) {
-
- slide->lines = lc;
-
- // clear text
- (text->reset)(text);
- l = 0;
-
- // create next slide
- slide = next_slide(slide);
- sc++;
-
- } else {
-
- // if slide ! has line
- if(!slide->line) {
-
- // create new line
- line = new_line();
- slide->line = line;
- lc = 1;
-
- } else {
-
- // create next line
- line = next_line(line);
- lc++;
-
- }
-
- // add text to line
- line->text = text;
-
- // add bits to line
- line->bits = bits;
-
- // add length to line
- line->length = l;
-
- // calc offset
- line->offset = next_nonblank(text, 0);
-
- // new text
- text = cstring_init();
- l = 0;
- }
-
- } else if(c == '\t') {
-
- // expand tab to spaces
- for (i = 0; i < EXPAND_TABS; i++) {
- (text->expand)(text, ' ');
- l++;
- }
-
- } else if(c == '\\') {
-
- // add char to line
- (text->expand)(text, c);
- l++;
-
- // if !IS_CODE add next char to line
- // and do not increase line count
- if(next_nonblank(text, 0) < CODE_INDENT) {
-
- c = fgetc(input);
- (text->expand)(text, c);
-
- if(is_utf8(c)) {
-
- // if utf-8 char > 1 byte add remaing to line
- for(i = 0; i < length_utf8(c) - 1; i++) {
- c = fgetc(input);
- (text->expand)(text, c);
- }
- }
-
- }
-
- } else if(isprint(c) || isspace((unsigned char) c)) {
-
- // add char to line
- (text->expand)(text, c);
- l++;
-
- } else if(is_utf8(c)) {
-
- // add char to line
- (text->expand)(text, c);
-
- // if utf-8 char > 1 byte add remaing to line
- for(i = 0; i < length_utf8(c) - 1; i++) {
- c = fgetc(input);
- (text->expand)(text, c);
- }
-
- l++;
- }
- }
-
- slide->lines = lc;
- deck->slides = sc;
-
- // detect header
- line = deck->slide->line;
- if(line && line->text->size > 0 && line->text->text[0] == '%') {
-
- // assign header to deck
- deck->header = line;
-
- // find first non-header line
- while(line->text->size > 0 && line->text->text[0] == '%') {
- hc++;
- line = line->next;
- }
-
- // split linked list
- line->prev->next = (void*)0;
- line->prev = (void*)0;
-
- // remove header lines from slide
- deck->slide->line = line;
-
- // adjust counts
- deck->headers += hc;
- deck->slide->lines -= hc;
- }
-
- // combine underlined H1/H2 in single line
- slide = deck->slide;
- while(slide) {
- line = slide->line;
- while(line) {
- if((CHECK_BIT(line->bits, IS_H1) ||
- CHECK_BIT(line->bits, IS_H2)) &&
- CHECK_BIT(line->bits, IS_EMPTY) &&
- line->prev &&
- !CHECK_BIT(line->prev->bits, IS_EMPTY)) {
-
- // remove line from linked list
- line->prev->next = line->next;
- if(line->next)
- line->next->prev = line->prev;
-
- // set bits on previous line
- if(CHECK_BIT(line->bits, IS_H1)) {
- SET_BIT(line->prev->bits, IS_H1);
- } else {
- SET_BIT(line->prev->bits, IS_H2);
- }
-
- // adjust line count
- slide->lines -= 1;
-
- // maintain loop condition
- tmp = line;
- line = line->prev;
-
- // delete line
- (tmp->text->delete)(tmp->text);
- free(tmp);
- }
- line = line->next;
- }
- slide = slide->next;
- }
-
- return deck;
-}
-
-int markdown_analyse(cstring_t *text) {
-
- int i = 0; // increment
- int bits = 0; // markdown bits
- int offset = 0; // text offset
- int eol = 0; // end of line
-
- int equals = 0, hashes = 0,
- stars = 0, minus = 0,
- spaces = 0, other = 0; // special character counts
-
- // count leading spaces
- offset = next_nonblank(text, 0);
-
- // strip trailing spaces
- for(eol = text->size; eol > offset && isspace((unsigned char) text->text[eol - 1]); eol--);
-
- // IS_CODE
- if(offset >= CODE_INDENT) {
- SET_BIT(bits, IS_CODE);
- }
-
- for(i = offset; i < eol; i++) {
-
- if(text->text[i] == ' ') {
- spaces++;
-
- } else if(CHECK_BIT(bits, IS_CODE)) {
- other++;
-
- } else {
- switch(text->text[i]) {
- case '=': equals++; break;
- case '#': hashes++; break;
- case '*': stars++; break;
- case '-': minus++; break;
- case '\\': other++; i++; break;
- default: other++; break;
- }
- }
- }
-
- // IS_H1
- if((equals > 0 &&
- hashes + stars + minus + spaces + other == 0) ||
- (text &&
- text->text &&
- text->text[offset] == '#' &&
- text->text[offset+1] != '#')) {
-
- SET_BIT(bits, IS_H1);
- }
-
- // IS_H2
- if((minus > 0 &&
- equals + hashes + stars + spaces + other == 0) ||
- (text &&
- text->text &&
- text->text[offset] == '#' &&
- text->text[offset+1] == '#')) {
-
- SET_BIT(bits, IS_H2);
- }
-
- // IS_QUOTE
- if(text &&
- text->text &&
- text->text[offset] == '>') {
-
- SET_BIT(bits, IS_QUOTE);
- }
-
- // IS_HR
- if((minus >= 3 && equals + hashes + stars + other == 0) ||
- (stars >= 3 && equals + hashes + minus + other == 0)) {
-
- SET_BIT(bits, IS_HR);
- }
-
- // IS_EMPTY
- if(other == 0) {
- SET_BIT(bits, IS_EMPTY);
- }
-
- return bits;
-}
-
-void markdown_debug(deck_t *deck, int debug) {
-
- int sc = 0; // slide count
- int lc = 0; // line count
-
- int offset;
- line_t *header;
-
- if(debug == 1) {
- fprintf(stderr, "headers: %i\nslides: %i\n", deck->headers, deck->slides);
-
- } else if(debug > 1) {
-
- // print header to STDERR
- if(deck->header) {
- header = deck->header;
- while(header &&
- header->length > 0 &&
- header->text->text[0] == '%') {
-
- // skip descriptor word (e.g. %title:)
- offset = next_blank(header->text, 0) + 1;
-
- fprintf(stderr, "header: %s\n", &header->text->text[offset]);
- header = header->next;
- }
- }
- }
-
- slide_t *slide = deck->slide;
- line_t *line;
-
- // print slide/line count to STDERR
- while(slide) {
- sc++;
-
- if(debug == 1) {
- fprintf(stderr, " slide %i: %i lines\n", sc, slide->lines);
-
- } else if(debug > 1) {
-
- // also print bits and line length
- fprintf(stderr, " slide %i:\n", sc);
- line = slide->line;
- lc = 0;
- while(line) {
- lc++;
- fprintf(stderr, " line %i: bits = %i, length = %i\n", lc, line->bits, line->length);
- line = line->next;
- }
- }
-
- slide = slide->next;
- }
-}
-
-int is_utf8(char ch) {
- return (ch & 0x80);
-}
-
-int length_utf8(char ch) {
-
- int i = 0; // increment
-
- while(ch & 0x80) {
- i++;
- ch <<= 1;
- }
-
- return i;
-}
-
-int next_nonblank(cstring_t *text, int i) {
- while ((i < text->size) && isspace((unsigned char) (text->text)[i]))
- ++i;
-
- return i;
-}
-
-int next_blank(cstring_t *text, int i) {
- while ((i < text->size) && !isspace((unsigned char) (text->text)[i]))
- ++i;
-
- return i;
-}
-
-int next_word(cstring_t *text, int i) {
- return next_nonblank(text, next_blank(text, i));
-}
-
