Exemplo n.º 1
0
Arquivo: blocks.c Projeto: gcgft/cmark
static void remove_trailing_blank_lines(cmark_strbuf *ln) {
  bufsize_t i;
  unsigned char c;

  for (i = ln->size - 1; i >= 0; --i) {
    c = ln->ptr[i];

    if (c != ' ' && c != '\t' && !S_is_line_end_char(c))
      break;
  }

  if (i < 0) {
    cmark_strbuf_clear(ln);
    return;
  }

  for (; i < ln->size; ++i) {
    c = ln->ptr[i];

    if (!S_is_line_end_char(c))
      continue;

    cmark_strbuf_truncate(ln, i);
    break;
  }
}
Exemplo n.º 2
0
Arquivo: blocks.c Projeto: gcgft/cmark
static void S_find_first_nonspace(cmark_parser *parser, cmark_chunk *input) {
  char c;
  int chars_to_tab = TAB_STOP - (parser->column % TAB_STOP);

  parser->first_nonspace = parser->offset;
  parser->first_nonspace_column = parser->column;
  while ((c = peek_at(input, parser->first_nonspace))) {
    if (c == ' ') {
      parser->first_nonspace += 1;
      parser->first_nonspace_column += 1;
      chars_to_tab = chars_to_tab - 1;
      if (chars_to_tab == 0) {
        chars_to_tab = TAB_STOP;
      }
    } else if (c == '\t') {
      parser->first_nonspace += 1;
      parser->first_nonspace_column += chars_to_tab;
      chars_to_tab = TAB_STOP;
    } else {
      break;
    }
  }

  parser->indent = parser->first_nonspace_column - parser->column;
  parser->blank = S_is_line_end_char(peek_at(input, parser->first_nonspace));
}
Exemplo n.º 3
0
Arquivo: blocks.c Projeto: gcgft/cmark
static void S_parser_feed(cmark_parser *parser, const unsigned char *buffer,
                          size_t len, bool eof) {
  const unsigned char *end = buffer + len;
  static const uint8_t repl[] = {239, 191, 189};

  while (buffer < end) {
    const unsigned char *eol;
    bufsize_t chunk_len;
    bool process = false;
    for (eol = buffer; eol < end; ++eol) {
      if (S_is_line_end_char(*eol)) {
        process = true;
        break;
      }
      if (*eol == '\0' && eol < end) {
        break;
      }
    }
    if (eol >= end && eof) {
      process = true;
    }

    chunk_len = cmark_strbuf_check_bufsize(eol - buffer);
    if (process) {
      if (parser->linebuf->size > 0) {
        cmark_strbuf_put(parser->linebuf, buffer, chunk_len);
        S_process_line(parser, parser->linebuf->ptr, parser->linebuf->size);
        cmark_strbuf_clear(parser->linebuf);
      } else {
        S_process_line(parser, buffer, chunk_len);
      }
    } else {
      if (eol < end && *eol == '\0') {
        // omit NULL byte
        cmark_strbuf_put(parser->linebuf, buffer, chunk_len);
        // add replacement character
        cmark_strbuf_put(parser->linebuf, repl, 3);
        chunk_len += 1; // so we advance the buffer past NULL
      } else {
        cmark_strbuf_put(parser->linebuf, buffer, chunk_len);
      }
    }

    buffer += chunk_len;
    // skip over line ending characters:
    if (buffer < end && *buffer == '\r')
      buffer++;
    if (buffer < end && *buffer == '\n')
      buffer++;
  }
}
Exemplo n.º 4
0
Arquivo: blocks.c Projeto: gcgft/cmark
static void S_process_line(cmark_parser *parser, const unsigned char *buffer,
                           bufsize_t bytes) {
  cmark_node *last_matched_container;
  bufsize_t matched = 0;
  int lev = 0;
  int i;
  cmark_list *data = NULL;
  bool all_matched = true;
  cmark_node *container;
  bool indented;
  cmark_chunk input;
  bool maybe_lazy;

  if (parser->options & CMARK_OPT_VALIDATE_UTF8) {
    cmark_utf8proc_check(parser->curline, buffer, bytes);
  } else {
    cmark_strbuf_put(parser->curline, buffer, bytes);
  }
  // ensure line ends with a newline:
  if (bytes == 0 || !S_is_line_end_char(parser->curline->ptr[bytes - 1])) {
    cmark_strbuf_putc(parser->curline, '\n');
  }
  parser->offset = 0;
  parser->column = 0;
  parser->blank = false;

  input.data = parser->curline->ptr;
  input.len = parser->curline->size;

  // container starts at the document root.
  container = parser->root;

  parser->line_number++;

  // for each containing node, try to parse the associated line start.
  // bail out on failure:  container will point to the last matching node.

  while (container->last_child && container->last_child->open) {
    container = container->last_child;

    S_find_first_nonspace(parser, &input);

    if (container->type == CMARK_NODE_BLOCK_QUOTE) {
      matched =
          parser->indent <= 3 && peek_at(&input, parser->first_nonspace) == '>';
      if (matched) {
        S_advance_offset(parser, &input, parser->indent + 1, true);
        if (peek_at(&input, parser->offset) == ' ')
          parser->offset++;
      } else {
        all_matched = false;
      }

    } else if (container->type == CMARK_NODE_ITEM) {
      if (parser->indent >=
          container->as.list.marker_offset + container->as.list.padding) {
        S_advance_offset(parser, &input, container->as.list.marker_offset +
                                             container->as.list.padding,
                         true);
      } else if (parser->blank && container->first_child != NULL) {
        // if container->first_child is NULL, then the opening line
        // of the list item was blank after the list marker; in this
        // case, we are done with the list item.
        S_advance_offset(parser, &input,
                         parser->first_nonspace - parser->offset, false);
      } else {
        all_matched = false;
      }

    } else if (container->type == CMARK_NODE_CODE_BLOCK) {

      if (!container->as.code.fenced) { // indented
        if (parser->indent >= CODE_INDENT) {
          S_advance_offset(parser, &input, CODE_INDENT, true);
        } else if (parser->blank) {
          S_advance_offset(parser, &input,
                           parser->first_nonspace - parser->offset, false);
        } else {
          all_matched = false;
        }
      } else { // fenced
        matched = 0;
        if (parser->indent <= 3 && (peek_at(&input, parser->first_nonspace) ==
                                    container->as.code.fence_char)) {
          matched = scan_close_code_fence(&input, parser->first_nonspace);
        }
        if (matched >= container->as.code.fence_length) {
          // closing fence - and since we're at
          // the end of a line, we can return:
          all_matched = false;
          S_advance_offset(parser, &input, matched, false);
          parser->current = finalize(parser, container);
          goto finished;
        } else {
          // skip opt. spaces of fence parser->offset
          i = container->as.code.fence_offset;
          while (i > 0 && peek_at(&input, parser->offset) == ' ') {
            S_advance_offset(parser, &input, 1, false);
            i--;
          }
        }
      }
    } else if (container->type == CMARK_NODE_HEADING) {

      // a heading can never contain more than one line
      all_matched = false;

    } else if (container->type == CMARK_NODE_HTML_BLOCK) {

      switch (container->as.html_block_type) {
      case 1:
      case 2:
      case 3:
      case 4:
      case 5:
        // these types of blocks can accept blanks
        break;
      case 6:
      case 7:
        if (parser->blank) {
          all_matched = false;
        }
        break;
      default:
        fprintf(stderr, "Error (%s:%d): Unknown HTML block type %d\n", __FILE__,
                __LINE__, container->as.html_block_type);
        exit(1);
      }

    } else if (container->type == CMARK_NODE_PARAGRAPH) {

      if (parser->blank) {
        all_matched = false;
      }
    }

    if (!all_matched) {
      container = container->parent; // back up to last matching node
      break;
    }
  }

  last_matched_container = container;

  // check to see if we've hit 2nd blank line, break out of list:
  if (parser->blank && container->last_line_blank) {
    break_out_of_lists(parser, &container);
  }

  maybe_lazy = parser->current->type == CMARK_NODE_PARAGRAPH;
  // try new container starts:
  while (container->type != CMARK_NODE_CODE_BLOCK &&
         container->type != CMARK_NODE_HTML_BLOCK) {

    S_find_first_nonspace(parser, &input);
    indented = parser->indent >= CODE_INDENT;

    if (!indented && peek_at(&input, parser->first_nonspace) == '>') {

      S_advance_offset(parser, &input,
                       parser->first_nonspace + 1 - parser->offset, false);
      // optional following character
      if (peek_at(&input, parser->offset) == ' ')
        S_advance_offset(parser, &input, 1, false);
      container = add_child(parser, container, CMARK_NODE_BLOCK_QUOTE,
                            parser->offset + 1);

    } else if (!indented && (matched = scan_atx_heading_start(
                                 &input, parser->first_nonspace))) {

      S_advance_offset(parser, &input,
                       parser->first_nonspace + matched - parser->offset,
                       false);
      container =
          add_child(parser, container, CMARK_NODE_HEADING, parser->offset + 1);

      bufsize_t hashpos =
          cmark_chunk_strchr(&input, '#', parser->first_nonspace);
      int level = 0;

      while (peek_at(&input, hashpos) == '#') {
        level++;
        hashpos++;
      }
      container->as.heading.level = level;
      container->as.heading.setext = false;

    } else if (!indented && (matched = scan_open_code_fence(
                                 &input, parser->first_nonspace))) {

      container = add_child(parser, container, CMARK_NODE_CODE_BLOCK,
                            parser->first_nonspace + 1);
      container->as.code.fenced = true;
      container->as.code.fence_char = peek_at(&input, parser->first_nonspace);
      container->as.code.fence_length = matched;
      container->as.code.fence_offset =
          (int8_t)(parser->first_nonspace - parser->offset);
      container->as.code.info = cmark_chunk_literal("");
      S_advance_offset(parser, &input,
                       parser->first_nonspace + matched - parser->offset,
                       false);

    } else if (!indented && ((matched = scan_html_block_start(
                                  &input, parser->first_nonspace)) ||
                             (container->type != CMARK_NODE_PARAGRAPH &&
                              (matched = scan_html_block_start_7(
                                   &input, parser->first_nonspace))))) {

      container = add_child(parser, container, CMARK_NODE_HTML_BLOCK,
                            parser->first_nonspace + 1);
      container->as.html_block_type = matched;
      // note, we don't adjust parser->offset because the tag is part of the
      // text

    } else if (!indented && container->type == CMARK_NODE_PARAGRAPH &&
               (lev =
                    scan_setext_heading_line(&input, parser->first_nonspace))) {

      container->type = CMARK_NODE_HEADING;
      container->as.heading.level = lev;
      container->as.heading.setext = true;
      S_advance_offset(parser, &input, input.len - 1 - parser->offset, false);

    } else if (!indented &&
               !(container->type == CMARK_NODE_PARAGRAPH && !all_matched) &&
               (matched =
                    scan_thematic_break(&input, parser->first_nonspace))) {

      // it's only now that we know the line is not part of a setext heading:
      container = add_child(parser, container, CMARK_NODE_THEMATIC_BREAK,
                            parser->first_nonspace + 1);
      S_advance_offset(parser, &input, input.len - 1 - parser->offset, false);

    } else if ((matched =
                    parse_list_marker(&input, parser->first_nonspace, &data)) &&
               (!indented || container->type == CMARK_NODE_LIST)) {
      // Note that we can have new list items starting with >= 4
      // spaces indent, as long as the list container is still open.

      // compute padding:
      S_advance_offset(parser, &input,
                       parser->first_nonspace + matched - parser->offset,
                       false);
      i = 0;
      while (i <= 5 && peek_at(&input, parser->offset + i) == ' ') {
        i++;
      }
      // i = number of spaces after marker, up to 5
      if (i >= 5 || i < 1 ||
          S_is_line_end_char(peek_at(&input, parser->offset))) {
        data->padding = matched + 1;
        if (i > 0) {
          S_advance_offset(parser, &input, 1, false);
        }
      } else {
        data->padding = matched + i;
        S_advance_offset(parser, &input, i, true);
      }

      // check container; if it's a list, see if this list item
      // can continue the list; otherwise, create a list container.

      data->marker_offset = parser->indent;

      if (container->type != CMARK_NODE_LIST ||
          !lists_match(&container->as.list, data)) {
        container = add_child(parser, container, CMARK_NODE_LIST,
                              parser->first_nonspace + 1);

        memcpy(&container->as.list, data, sizeof(*data));
      }

      // add the list item
      container = add_child(parser, container, CMARK_NODE_ITEM,
                            parser->first_nonspace + 1);
      /* TODO: static */
      memcpy(&container->as.list, data, sizeof(*data));
      free(data);

    } else if (indented && !maybe_lazy && !parser->blank) {
      S_advance_offset(parser, &input, CODE_INDENT, true);
      container = add_child(parser, container, CMARK_NODE_CODE_BLOCK,
                            parser->offset + 1);
      container->as.code.fenced = false;
      container->as.code.fence_char = 0;
      container->as.code.fence_length = 0;
      container->as.code.fence_offset = 0;
      container->as.code.info = cmark_chunk_literal("");

    } else {
      break;
    }

    if (accepts_lines(container->type)) {
      // if it's a line container, it can't contain other containers
      break;
    }
    maybe_lazy = false;
  }

  // what remains at parser->offset is a text line.  add the text to the
  // appropriate container.

  S_find_first_nonspace(parser, &input);

  if (parser->blank && container->last_child) {
    container->last_child->last_line_blank = true;
  }

  // block quote lines are never blank as they start with >
  // and we don't count blanks in fenced code for purposes of tight/loose
  // lists or breaking out of lists.  we also don't set last_line_blank
  // on an empty list item.
  container->last_line_blank =
      (parser->blank && container->type != CMARK_NODE_BLOCK_QUOTE &&
       container->type != CMARK_NODE_HEADING &&
       container->type != CMARK_NODE_THEMATIC_BREAK &&
       !(container->type == CMARK_NODE_CODE_BLOCK &&
         container->as.code.fenced) &&
       !(container->type == CMARK_NODE_ITEM && container->first_child == NULL &&
         container->start_line == parser->line_number));

  cmark_node *cont = container;
  while (cont->parent) {
    cont->parent->last_line_blank = false;
    cont = cont->parent;
  }

  if (parser->current != last_matched_container &&
      container == last_matched_container && !parser->blank &&
      parser->current->type == CMARK_NODE_PARAGRAPH &&
      cmark_strbuf_len(&parser->current->string_content) > 0) {

    add_line(parser->current, &input, parser->offset);

  } else { // not a lazy continuation

    // finalize any blocks that were not matched and set cur to container:
    while (parser->current != last_matched_container) {
      parser->current = finalize(parser, parser->current);
      assert(parser->current != NULL);
    }

    if (container->type == CMARK_NODE_CODE_BLOCK) {

      add_line(container, &input, parser->offset);

    } else if (container->type == CMARK_NODE_HTML_BLOCK) {

      add_line(container, &input, parser->offset);

      int matches_end_condition;
      switch (container->as.html_block_type) {
      case 1:
        // </script>, </style>, </pre>
        matches_end_condition =
            scan_html_block_end_1(&input, parser->first_nonspace);
        break;
      case 2:
        // -->
        matches_end_condition =
            scan_html_block_end_2(&input, parser->first_nonspace);
        break;
      case 3:
        // ?>
        matches_end_condition =
            scan_html_block_end_3(&input, parser->first_nonspace);
        break;
      case 4:
        // >
        matches_end_condition =
            scan_html_block_end_4(&input, parser->first_nonspace);
        break;
      case 5:
        // ]]>
        matches_end_condition =
            scan_html_block_end_5(&input, parser->first_nonspace);
        break;
      default:
        matches_end_condition = 0;
        break;
      }

      if (matches_end_condition) {
        container = finalize(parser, container);
        assert(parser->current != NULL);
      }

    } else if (parser->blank) {

      // ??? do nothing

    } else if (accepts_lines(container->type)) {

      if (container->type == CMARK_NODE_HEADING &&
          container->as.heading.setext == false) {
        chop_trailing_hashtags(&input);
      }
      add_line(container, &input, parser->first_nonspace);

    } else {
      // create paragraph container for line
      container = add_child(parser, container, CMARK_NODE_PARAGRAPH,
                            parser->first_nonspace + 1);
      add_line(container, &input, parser->first_nonspace);
    }

    parser->current = container;
  }
finished:
  parser->last_line_length = input.len;
  if (parser->last_line_length &&
      input.data[parser->last_line_length - 1] == '\n')
    parser->last_line_length -= 1;
  if (parser->last_line_length &&
      input.data[parser->last_line_length - 1] == '\r')
    parser->last_line_length -= 1;

  cmark_strbuf_clear(parser->curline);
}
Exemplo n.º 5
0
Arquivo: blocks.c Projeto: gcgft/cmark
static cmark_node *finalize(cmark_parser *parser, cmark_node *b) {
  bufsize_t pos;
  cmark_node *item;
  cmark_node *subitem;
  cmark_node *parent;

  parent = b->parent;

  assert(b->open); // shouldn't call finalize on closed blocks
  b->open = false;

  if (parser->curline->size == 0) {
    // end of input - line number has not been incremented
    b->end_line = parser->line_number;
    b->end_column = parser->last_line_length;
  } else if (b->type == CMARK_NODE_DOCUMENT ||
             (b->type == CMARK_NODE_CODE_BLOCK && b->as.code.fenced) ||
             (b->type == CMARK_NODE_HEADING && b->as.heading.setext)) {
    b->end_line = parser->line_number;
    b->end_column = parser->curline->size;
    if (b->end_column && parser->curline->ptr[b->end_column - 1] == '\n')
      b->end_column -= 1;
    if (b->end_column && parser->curline->ptr[b->end_column - 1] == '\r')
      b->end_column -= 1;
  } else {
    b->end_line = parser->line_number - 1;
    b->end_column = parser->last_line_length;
  }

  switch (b->type) {
  case CMARK_NODE_PARAGRAPH:
    while (cmark_strbuf_at(&b->string_content, 0) == '[' &&
           (pos = cmark_parse_reference_inline(&b->string_content,
                                               parser->refmap))) {

      cmark_strbuf_drop(&b->string_content, pos);
    }
    if (is_blank(&b->string_content, 0)) {
      // remove blank node (former reference def)
      cmark_node_free(b);
    }
    break;

  case CMARK_NODE_CODE_BLOCK:
    if (!b->as.code.fenced) { // indented code
      remove_trailing_blank_lines(&b->string_content);
      cmark_strbuf_putc(&b->string_content, '\n');
    } else {

      // first line of contents becomes info
      for (pos = 0; pos < b->string_content.size; ++pos) {
        if (S_is_line_end_char(b->string_content.ptr[pos]))
          break;
      }
      assert(pos < b->string_content.size);

      cmark_strbuf tmp = GH_BUF_INIT;
      houdini_unescape_html_f(&tmp, b->string_content.ptr, pos);
      cmark_strbuf_trim(&tmp);
      cmark_strbuf_unescape(&tmp);
      b->as.code.info = cmark_chunk_buf_detach(&tmp);

      if (b->string_content.ptr[pos] == '\r')
        pos += 1;
      if (b->string_content.ptr[pos] == '\n')
        pos += 1;
      cmark_strbuf_drop(&b->string_content, pos);
    }
    b->as.code.literal = cmark_chunk_buf_detach(&b->string_content);
    break;

  case CMARK_NODE_HTML_BLOCK:
    b->as.literal = cmark_chunk_buf_detach(&b->string_content);
    break;

  case CMARK_NODE_LIST:      // determine tight/loose status
    b->as.list.tight = true; // tight by default
    item = b->first_child;

    while (item) {
      // check for non-final non-empty list item ending with blank line:
      if (item->last_line_blank && item->next) {
        b->as.list.tight = false;
        break;
      }
      // recurse into children of list item, to see if there are
      // spaces between them:
      subitem = item->first_child;
      while (subitem) {
        if (ends_with_blank_line(subitem) && (item->next || subitem->next)) {
          b->as.list.tight = false;
          break;
        }
        subitem = subitem->next;
      }
      if (!(b->as.list.tight)) {
        break;
      }
      item = item->next;
    }

    break;

  default:
    break;
  }
  return parent;
}
Exemplo n.º 6
0
// Parse an inline, advancing subject, and add it as a child of parent.
// Return 0 if no inline can be parsed, 1 otherwise.
static int parse_inline(subject *subj, cmark_node *parent, int options) {
  cmark_node *new_inl = NULL;
  cmark_chunk contents;
  unsigned char c;
  bufsize_t endpos;
  c = peek_char(subj);
  if (c == 0) {
    return 0;
  }
  switch (c) {
  case '\r':
  case '\n':
    new_inl = handle_newline(subj);
    break;
  case '`':
    new_inl = handle_backticks(subj);
    break;
  case '\\':
    new_inl = handle_backslash(subj);
    break;
  case '&':
    new_inl = handle_entity(subj);
    break;
  case '<':
    new_inl = handle_pointy_brace(subj);
    break;
  case '*':
  case '_':
  case '\'':
  case '"':
    new_inl = handle_delim(subj, c, (options & CMARK_OPT_SMART) != 0);
    break;
  case '-':
    new_inl = handle_hyphen(subj, (options & CMARK_OPT_SMART) != 0);
    break;
  case '.':
    new_inl = handle_period(subj, (options & CMARK_OPT_SMART) != 0);
    break;
  case '[':
    advance(subj);
    new_inl = make_str(subj->mem, cmark_chunk_literal("["));
    push_bracket(subj, false, new_inl);
    break;
  case ']':
    new_inl = handle_close_bracket(subj);
    break;
  case '!':
    advance(subj);
    if (peek_char(subj) == '[') {
      advance(subj);
      new_inl = make_str(subj->mem, cmark_chunk_literal("!["));
      push_bracket(subj, true, new_inl);
    } else {
      new_inl = make_str(subj->mem, cmark_chunk_literal("!"));
    }
    break;
  default:
    endpos = subject_find_special_char(subj, options);
    contents = cmark_chunk_dup(&subj->input, subj->pos, endpos - subj->pos);
    subj->pos = endpos;

    // if we're at a newline, strip trailing spaces.
    if (S_is_line_end_char(peek_char(subj))) {
      cmark_chunk_rtrim(&contents);
    }

    new_inl = make_str(subj->mem, contents);
  }
  if (new_inl != NULL) {
    cmark_node_append_child(parent, new_inl);
  }

  return 1;
}