static int is_valid_hostchar(const uint8_t *link, size_t link_len) {
int32_t ch;
int r = cmark_utf8proc_iterate(link, (bufsize_t)link_len, &ch);
if (r < 0)
return 0;
return !cmark_utf8proc_is_space(ch) && !cmark_utf8proc_is_punctuation(ch);
}
static void S_out(cmark_renderer *renderer, cmark_node *node,
const char *source, bool wrap,
cmark_escaping escape) {
int length = (int)strlen(source);
unsigned char nextc;
int32_t c;
int i = 0;
int last_nonspace;
int len;
cmark_chunk remainder = cmark_chunk_literal("");
int k = renderer->buffer->size - 1;
cmark_syntax_extension *ext = NULL;
cmark_node *n = node;
while (n && !ext) {
ext = n->extension;
if (!ext)
n = n->parent;
}
if (ext && !ext->commonmark_escape_func)
ext = NULL;
wrap = wrap && !renderer->no_linebreaks;
if (renderer->in_tight_list_item && renderer->need_cr > 1) {
renderer->need_cr = 1;
}
while (renderer->need_cr) {
if (k < 0 || renderer->buffer->ptr[k] == '\n') {
k -= 1;
} else {
cmark_strbuf_putc(renderer->buffer, '\n');
if (renderer->need_cr > 1) {
cmark_strbuf_put(renderer->buffer, renderer->prefix->ptr,
renderer->prefix->size);
}
}
renderer->column = 0;
renderer->begin_line = true;
renderer->begin_content = true;
renderer->need_cr -= 1;
}
while (i < length) {
if (renderer->begin_line) {
cmark_strbuf_put(renderer->buffer, renderer->prefix->ptr,
renderer->prefix->size);
// note: this assumes prefix is ascii:
renderer->column = renderer->prefix->size;
}
len = cmark_utf8proc_iterate((const uint8_t *)source + i, length - i, &c);
if (len == -1) { // error condition
return; // return without rendering rest of string
}
if (ext && ext->commonmark_escape_func(ext, node, c))
cmark_strbuf_putc(renderer->buffer, '\\');
nextc = source[i + len];
if (c == 32 && wrap) {
if (!renderer->begin_line) {
last_nonspace = renderer->buffer->size;
cmark_strbuf_putc(renderer->buffer, ' ');
renderer->column += 1;
renderer->begin_line = false;
renderer->begin_content = false;
// skip following spaces
while (source[i + 1] == ' ') {
i++;
}
// We don't allow breaks that make a digit the first character
// because this causes problems with commonmark output.
if (!cmark_isdigit(source[i + 1])) {
renderer->last_breakable = last_nonspace;
}
}
} else if (c == 10) {
cmark_strbuf_putc(renderer->buffer, '\n');
renderer->column = 0;
renderer->begin_line = true;
renderer->begin_content = true;
renderer->last_breakable = 0;
} else if (escape == LITERAL) {
cmark_render_code_point(renderer, c);
renderer->begin_line = false;
// we don't set 'begin_content' to false til we've
// finished parsing a digit. Reason: in commonmark
// we need to escape a potential list marker after
// a digit:
renderer->begin_content =
renderer->begin_content && cmark_isdigit((char)c) == 1;
} else {
(renderer->outc)(renderer, node, escape, c, nextc);
renderer->begin_line = false;
renderer->begin_content =
renderer->begin_content && cmark_isdigit((char)c) == 1;
}
// If adding the character went beyond width, look for an
// earlier place where the line could be broken:
if (renderer->width > 0 && renderer->column > renderer->width &&
!renderer->begin_line && renderer->last_breakable > 0) {
// copy from last_breakable to remainder
cmark_chunk_set_cstr(renderer->mem, &remainder,
(char *)renderer->buffer->ptr +
renderer->last_breakable + 1);
// truncate at last_breakable
cmark_strbuf_truncate(renderer->buffer, renderer->last_breakable);
// add newline, prefix, and remainder
cmark_strbuf_putc(renderer->buffer, '\n');
cmark_strbuf_put(renderer->buffer, renderer->prefix->ptr,
renderer->prefix->size);
cmark_strbuf_put(renderer->buffer, remainder.data, remainder.len);
renderer->column = renderer->prefix->size + remainder.len;
cmark_chunk_free(renderer->mem, &remainder);
renderer->last_breakable = 0;
renderer->begin_line = false;
renderer->begin_content = false;
}
i += len;
}
}
// Scan ***, **, or * and return number scanned, or 0.
// Advances position.
static int scan_delims(subject *subj, unsigned char c, bool *can_open,
bool *can_close) {
int numdelims = 0;
bufsize_t before_char_pos;
int32_t after_char = 0;
int32_t before_char = 0;
int len;
bool left_flanking, right_flanking;
if (subj->pos == 0) {
before_char = 10;
} else {
before_char_pos = subj->pos - 1;
// walk back to the beginning of the UTF_8 sequence:
while (peek_at(subj, before_char_pos) >> 6 == 2 && before_char_pos > 0) {
before_char_pos -= 1;
}
len = cmark_utf8proc_iterate(subj->input.data + before_char_pos,
subj->pos - before_char_pos, &before_char);
if (len == -1) {
before_char = 10;
}
}
if (c == '\'' || c == '"') {
numdelims++;
advance(subj); // limit to 1 delim for quotes
} else {
while (peek_char(subj) == c) {
numdelims++;
advance(subj);
}
}
len = cmark_utf8proc_iterate(subj->input.data + subj->pos,
subj->input.len - subj->pos, &after_char);
if (len == -1) {
after_char = 10;
}
left_flanking = numdelims > 0 && !cmark_utf8proc_is_space(after_char) &&
(!cmark_utf8proc_is_punctuation(after_char) ||
cmark_utf8proc_is_space(before_char) ||
cmark_utf8proc_is_punctuation(before_char));
right_flanking = numdelims > 0 && !cmark_utf8proc_is_space(before_char) &&
(!cmark_utf8proc_is_punctuation(before_char) ||
cmark_utf8proc_is_space(after_char) ||
cmark_utf8proc_is_punctuation(after_char));
if (c == '_') {
*can_open = left_flanking &&
(!right_flanking || cmark_utf8proc_is_punctuation(before_char));
*can_close = right_flanking &&
(!left_flanking || cmark_utf8proc_is_punctuation(after_char));
} else if (c == '\'' || c == '"') {
*can_open = left_flanking && !right_flanking;
*can_close = right_flanking;
} else {
*can_open = left_flanking;
*can_close = right_flanking;
}
return numdelims;
}
