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Spectral/include/hoedown/html_smartypants.c

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#include "html.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#ifdef _MSC_VER
#define snprintf _snprintf
#endif
struct smartypants_data {
int in_squote;
int in_dquote;
};
static size_t smartypants_cb__ltag(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size);
static size_t smartypants_cb__dquote(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size);
static size_t smartypants_cb__amp(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size);
static size_t smartypants_cb__period(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size);
static size_t smartypants_cb__number(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size);
static size_t smartypants_cb__dash(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size);
static size_t smartypants_cb__parens(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size);
static size_t smartypants_cb__squote(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size);
static size_t smartypants_cb__backtick(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size);
static size_t smartypants_cb__escape(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size);
static size_t (*smartypants_cb_ptrs[])
(hoedown_buffer *, struct smartypants_data *, uint8_t, const uint8_t *, size_t) =
{
NULL, /* 0 */
smartypants_cb__dash, /* 1 */
smartypants_cb__parens, /* 2 */
smartypants_cb__squote, /* 3 */
smartypants_cb__dquote, /* 4 */
smartypants_cb__amp, /* 5 */
smartypants_cb__period, /* 6 */
smartypants_cb__number, /* 7 */
smartypants_cb__ltag, /* 8 */
smartypants_cb__backtick, /* 9 */
smartypants_cb__escape, /* 10 */
};
static const uint8_t smartypants_cb_chars[UINT8_MAX+1] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 4, 0, 0, 0, 5, 3, 2, 0, 0, 0, 0, 1, 6, 0,
0, 7, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 0, 0, 0,
9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
static int
word_boundary(uint8_t c)
{
return c == 0 || isspace(c) || ispunct(c);
}
/*
If 'text' begins with any kind of single quote (e.g. "'" or "&apos;" etc.),
returns the length of the sequence of characters that makes up the single-
quote. Otherwise, returns zero.
*/
static size_t
squote_len(const uint8_t *text, size_t size)
{
static char* single_quote_list[] = { "'", "&#39;", "&#x27;", "&apos;", NULL };
char** p;
for (p = single_quote_list; *p; ++p) {
size_t len = strlen(*p);
if (size >= len && memcmp(text, *p, len) == 0) {
return len;
}
}
return 0;
}
/* Converts " or ' at very beginning or end of a word to left or right quote */
static int
smartypants_quotes(hoedown_buffer *ob, uint8_t previous_char, uint8_t next_char, uint8_t quote, int *is_open)
{
char ent[8];
if (*is_open && !word_boundary(next_char))
return 0;
if (!(*is_open) && !word_boundary(previous_char))
return 0;
snprintf(ent, sizeof(ent), "&%c%cquo;", (*is_open) ? 'r' : 'l', quote);
*is_open = !(*is_open);
hoedown_buffer_puts(ob, ent);
return 1;
}
/*
Converts ' to left or right single quote; but the initial ' might be in
different forms, e.g. &apos; or &#39; or &#x27;.
'squote_text' points to the original single quote, and 'squote_size' is its length.
'text' points at the last character of the single-quote, e.g. ' or ;
*/
static size_t
smartypants_squote(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size,
const uint8_t *squote_text, size_t squote_size)
{
if (size >= 2) {
uint8_t t1 = tolower(text[1]);
size_t next_squote_len = squote_len(text+1, size-1);
/* convert '' to &ldquo; or &rdquo; */
if (next_squote_len > 0) {
uint8_t next_char = (size > 1+next_squote_len) ? text[1+next_squote_len] : 0;
if (smartypants_quotes(ob, previous_char, next_char, 'd', &smrt->in_dquote))
return next_squote_len;
}
/* Tom's, isn't, I'm, I'd */
if ((t1 == 's' || t1 == 't' || t1 == 'm' || t1 == 'd') &&
(size == 3 || word_boundary(text[2]))) {
HOEDOWN_BUFPUTSL(ob, "&rsquo;");
return 0;
}
/* you're, you'll, you've */
if (size >= 3) {
uint8_t t2 = tolower(text[2]);
if (((t1 == 'r' && t2 == 'e') ||
(t1 == 'l' && t2 == 'l') ||
(t1 == 'v' && t2 == 'e')) &&
(size == 4 || word_boundary(text[3]))) {
HOEDOWN_BUFPUTSL(ob, "&rsquo;");
return 0;
}
}
}
if (smartypants_quotes(ob, previous_char, size > 0 ? text[1] : 0, 's', &smrt->in_squote))
return 0;
hoedown_buffer_put(ob, squote_text, squote_size);
return 0;
}
/* Converts ' to left or right single quote. */
static size_t
smartypants_cb__squote(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size)
{
return smartypants_squote(ob, smrt, previous_char, text, size, text, 1);
}
/* Converts (c), (r), (tm) */
static size_t
smartypants_cb__parens(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size)
{
if (size >= 3) {
uint8_t t1 = tolower(text[1]);
uint8_t t2 = tolower(text[2]);
if (t1 == 'c' && t2 == ')') {
HOEDOWN_BUFPUTSL(ob, "&copy;");
return 2;
}
if (t1 == 'r' && t2 == ')') {
HOEDOWN_BUFPUTSL(ob, "&reg;");
return 2;
}
if (size >= 4 && t1 == 't' && t2 == 'm' && text[3] == ')') {
HOEDOWN_BUFPUTSL(ob, "&trade;");
return 3;
}
}
hoedown_buffer_putc(ob, text[0]);
return 0;
}
/* Converts "--" to em-dash, etc. */
static size_t
smartypants_cb__dash(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size)
{
if (size >= 3 && text[1] == '-' && text[2] == '-') {
HOEDOWN_BUFPUTSL(ob, "&mdash;");
return 2;
}
if (size >= 2 && text[1] == '-') {
HOEDOWN_BUFPUTSL(ob, "&ndash;");
return 1;
}
hoedown_buffer_putc(ob, text[0]);
return 0;
}
/* Converts &quot; etc. */
static size_t
smartypants_cb__amp(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size)
{
size_t len;
if (size >= 6 && memcmp(text, "&quot;", 6) == 0) {
if (smartypants_quotes(ob, previous_char, size >= 7 ? text[6] : 0, 'd', &smrt->in_dquote))
return 5;
}
len = squote_len(text, size);
if (len > 0) {
return (len-1) + smartypants_squote(ob, smrt, previous_char, text+(len-1), size-(len-1), text, len);
}
if (size >= 4 && memcmp(text, "&#0;", 4) == 0)
return 3;
hoedown_buffer_putc(ob, '&');
return 0;
}
/* Converts "..." to ellipsis */
static size_t
smartypants_cb__period(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size)
{
if (size >= 3 && text[1] == '.' && text[2] == '.') {
HOEDOWN_BUFPUTSL(ob, "&hellip;");
return 2;
}
if (size >= 5 && text[1] == ' ' && text[2] == '.' && text[3] == ' ' && text[4] == '.') {
HOEDOWN_BUFPUTSL(ob, "&hellip;");
return 4;
}
hoedown_buffer_putc(ob, text[0]);
return 0;
}
/* Converts `` to opening double quote */
static size_t
smartypants_cb__backtick(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size)
{
if (size >= 2 && text[1] == '`') {
if (smartypants_quotes(ob, previous_char, size >= 3 ? text[2] : 0, 'd', &smrt->in_dquote))
return 1;
}
hoedown_buffer_putc(ob, text[0]);
return 0;
}
/* Converts 1/2, 1/4, 3/4 */
static size_t
smartypants_cb__number(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size)
{
if (word_boundary(previous_char) && size >= 3) {
if (text[0] == '1' && text[1] == '/' && text[2] == '2') {
if (size == 3 || word_boundary(text[3])) {
HOEDOWN_BUFPUTSL(ob, "&frac12;");
return 2;
}
}
if (text[0] == '1' && text[1] == '/' && text[2] == '4') {
if (size == 3 || word_boundary(text[3]) ||
(size >= 5 && tolower(text[3]) == 't' && tolower(text[4]) == 'h')) {
HOEDOWN_BUFPUTSL(ob, "&frac14;");
return 2;
}
}
if (text[0] == '3' && text[1] == '/' && text[2] == '4') {
if (size == 3 || word_boundary(text[3]) ||
(size >= 6 && tolower(text[3]) == 't' && tolower(text[4]) == 'h' && tolower(text[5]) == 's')) {
HOEDOWN_BUFPUTSL(ob, "&frac34;");
return 2;
}
}
}
hoedown_buffer_putc(ob, text[0]);
return 0;
}
/* Converts " to left or right double quote */
static size_t
smartypants_cb__dquote(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size)
{
if (!smartypants_quotes(ob, previous_char, size > 0 ? text[1] : 0, 'd', &smrt->in_dquote))
HOEDOWN_BUFPUTSL(ob, "&quot;");
return 0;
}
static size_t
smartypants_cb__ltag(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size)
{
static const char *skip_tags[] = {
"pre", "code", "var", "samp", "kbd", "math", "script", "style"
};
static const size_t skip_tags_count = 8;
size_t tag, i = 0;
/* This is a comment. Copy everything verbatim until --> or EOF is seen. */
if (i + 4 < size && memcmp(text + i, "<!--", 4) == 0) {
i += 4;
while (i + 3 < size && memcmp(text + i, "-->", 3) != 0)
i++;
i += 3;
hoedown_buffer_put(ob, text, i + 1);
return i;
}
while (i < size && text[i] != '>')
i++;
for (tag = 0; tag < skip_tags_count; ++tag) {
if (hoedown_html_is_tag(text, size, skip_tags[tag]) == HOEDOWN_HTML_TAG_OPEN)
break;
}
if (tag < skip_tags_count) {
for (;;) {
while (i < size && text[i] != '<')
i++;
if (i == size)
break;
if (hoedown_html_is_tag(text + i, size - i, skip_tags[tag]) == HOEDOWN_HTML_TAG_CLOSE)
break;
i++;
}
while (i < size && text[i] != '>')
i++;
}
hoedown_buffer_put(ob, text, i + 1);
return i;
}
static size_t
smartypants_cb__escape(hoedown_buffer *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size)
{
if (size < 2)
return 0;
switch (text[1]) {
case '\\':
case '"':
case '\'':
case '.':
case '-':
case '`':
hoedown_buffer_putc(ob, text[1]);
return 1;
default:
hoedown_buffer_putc(ob, '\\');
return 0;
}
}
#if 0
static struct {
uint8_t c0;
const uint8_t *pattern;
const uint8_t *entity;
int skip;
} smartypants_subs[] = {
{ '\'', "'s>", "&rsquo;", 0 },
{ '\'', "'t>", "&rsquo;", 0 },
{ '\'', "'re>", "&rsquo;", 0 },
{ '\'', "'ll>", "&rsquo;", 0 },
{ '\'', "'ve>", "&rsquo;", 0 },
{ '\'', "'m>", "&rsquo;", 0 },
{ '\'', "'d>", "&rsquo;", 0 },
{ '-', "--", "&mdash;", 1 },
{ '-', "<->", "&ndash;", 0 },
{ '.', "...", "&hellip;", 2 },
{ '.', ". . .", "&hellip;", 4 },
{ '(', "(c)", "&copy;", 2 },
{ '(', "(r)", "&reg;", 2 },
{ '(', "(tm)", "&trade;", 3 },
{ '3', "<3/4>", "&frac34;", 2 },
{ '3', "<3/4ths>", "&frac34;", 2 },
{ '1', "<1/2>", "&frac12;", 2 },
{ '1', "<1/4>", "&frac14;", 2 },
{ '1', "<1/4th>", "&frac14;", 2 },
{ '&', "&#0;", 0, 3 },
};
#endif
void
hoedown_html_smartypants(hoedown_buffer *ob, const uint8_t *text, size_t size)
{
size_t i;
struct smartypants_data smrt = {0, 0};
if (!text)
return;
hoedown_buffer_grow(ob, size);
for (i = 0; i < size; ++i) {
size_t org;
uint8_t action = 0;
org = i;
while (i < size && (action = smartypants_cb_chars[text[i]]) == 0)
i++;
if (i > org)
hoedown_buffer_put(ob, text + org, i - org);
if (i < size) {
i += smartypants_cb_ptrs[(int)action]
(ob, &smrt, i ? text[i - 1] : 0, text + i, size - i);
}
}
}
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