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/* Output stream that produces HTML output.
Copyright (C) 2006-2009 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2006.
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 <config.h>
/* Specification. */
#include "html-ostream.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "gl_xlist.h"
#include "gl_array_list.h"
#include "unistr.h"
#include "xalloc.h"
struct html_ostream : struct ostream
{
fields:
/* The destination stream. */
ostream_t destination;
/* The stack of active CSS classes. */
gl_list_t /* <char *> */ class_stack;
/* Current and last size of the active portion of this stack. Always
size(class_stack) == max(curr_class_stack_size,last_class_stack_size). */
size_t curr_class_stack_size;
size_t last_class_stack_size;
/* Last few bytes that could not yet be converted. */
#define BUFSIZE 6
char buf[BUFSIZE];
size_t buflen;
};
/* Implementation of ostream_t methods. */
static void
emit_pending_spans (html_ostream_t stream, bool shrink_stack)
{
if (stream->curr_class_stack_size > stream->last_class_stack_size)
{
size_t i;
for (i = stream->last_class_stack_size; i < stream->curr_class_stack_size; i++)
{
char *classname = (char *) gl_list_get_at (stream->class_stack, i);
ostream_write_str (stream->destination, "<span class=\"");
ostream_write_str (stream->destination, classname);
ostream_write_str (stream->destination, "\">");
}
stream->last_class_stack_size = stream->curr_class_stack_size;
}
else if (stream->curr_class_stack_size < stream->last_class_stack_size)
{
size_t i = stream->last_class_stack_size;
while (i > stream->curr_class_stack_size)
{
char *classname;
--i;
classname = (char *) gl_list_get_at (stream->class_stack, i);
ostream_write_str (stream->destination, "</span>");
if (shrink_stack)
{
gl_list_remove_at (stream->class_stack, i);
free (classname);
}
}
stream->last_class_stack_size = stream->curr_class_stack_size;
}
}
static void
html_ostream::write_mem (html_ostream_t stream, const void *data, size_t len)
{
if (len > 0)
{
#define BUFFERSIZE 2048
char inbuffer[BUFFERSIZE];
size_t inbufcount;
inbufcount = stream->buflen;
if (inbufcount > 0)
memcpy (inbuffer, stream->buf, inbufcount);
for (;;)
{
/* At this point, inbuffer[0..inbufcount-1] is filled. */
{
/* Combine the previous rest with a chunk of new input. */
size_t n =
(len <= BUFFERSIZE - inbufcount ? len : BUFFERSIZE - inbufcount);
if (n > 0)
{
memcpy (inbuffer + inbufcount, data, n);
data = (char *) data + n;
inbufcount += n;
len -= n;
}
}
{
/* Handle complete UTF-8 characters. */
const char *inptr = inbuffer;
size_t insize = inbufcount;
while (insize > 0)
{
unsigned char c0;
ucs4_t uc;
int nbytes;
c0 = ((const unsigned char *) inptr)[0];
if (insize < (c0 < 0xc0 ? 1 : c0 < 0xe0 ? 2 : c0 < 0xf0 ? 3 :
c0 < 0xf8 ? 4 : c0 < 0xfc ? 5 : 6))
break;
nbytes = u8_mbtouc (&uc, (const unsigned char *) inptr, insize);
if (uc == '\n')
{
size_t prev_class_stack_size = stream->curr_class_stack_size;
stream->curr_class_stack_size = 0;
emit_pending_spans (stream, false);
ostream_write_str (stream->destination, "<br/>");
stream->curr_class_stack_size = prev_class_stack_size;
}
else
{
emit_pending_spans (stream, true);
switch (uc)
{
case '"':
ostream_write_str (stream->destination, """);
break;
case '&':
ostream_write_str (stream->destination, "&");
break;
case '<':
ostream_write_str (stream->destination, "<");
break;
case '>':
/* Needed to avoid "]]>" in the output. */
ostream_write_str (stream->destination, ">");
break;
case ' ':
/* Needed because HTML viewers merge adjacent spaces
and drop spaces adjacent to <br> and similar. */
ostream_write_str (stream->destination, " ");
break;
default:
if (uc >= 0x20 && uc < 0x7F)
{
/* Output ASCII characters as such. */
char bytes[1];
bytes[0] = uc;
ostream_write_mem (stream->destination, bytes, 1);
}
else
{
/* Output non-ASCII characters in #&nnn;
notation. */
char bytes[32];
sprintf (bytes, "&#%d;", (int) uc);
ostream_write_str (stream->destination, bytes);
}
break;
}
}
inptr += nbytes;
insize -= nbytes;
}
/* Put back the unconverted part. */
if (insize > BUFSIZE)
abort ();
if (len == 0)
{
if (insize > 0)
memcpy (stream->buf, inptr, insize);
stream->buflen = insize;
break;
}
if (insize > 0)
memmove (inbuffer, inptr, insize);
inbufcount = insize;
}
}
#undef BUFFERSIZE
}
}
static void
html_ostream::flush (html_ostream_t stream)
{
/* There's nothing to do here, since stream->buf[] contains only a few
bytes that don't correspond to a character, and it's not worth closing
the open spans. */
}
static void
html_ostream::free (html_ostream_t stream)
{
stream->curr_class_stack_size = 0;
emit_pending_spans (stream, true);
gl_list_free (stream->class_stack);
free (stream);
}
/* Implementation of html_ostream_t methods. */
static void
html_ostream::begin_span (html_ostream_t stream, const char *classname)
{
if (stream->last_class_stack_size > stream->curr_class_stack_size
&& strcmp ((char *) gl_list_get_at (stream->class_stack,
stream->curr_class_stack_size),
classname) != 0)
emit_pending_spans (stream, true);
/* Now either
last_class_stack_size <= curr_class_stack_size
- in this case we have to append the given CLASSNAME -
or
last_class_stack_size > curr_class_stack_size
&& class_stack[curr_class_stack_size] == CLASSNAME
- in this case we only need to increment curr_class_stack_size. */
if (stream->last_class_stack_size <= stream->curr_class_stack_size)
gl_list_add_at (stream->class_stack, stream->curr_class_stack_size,
xstrdup (classname));
stream->curr_class_stack_size++;
}
static void
html_ostream::end_span (html_ostream_t stream, const char *classname)
{
if (!(stream->curr_class_stack_size > 0
&& strcmp ((char *) gl_list_get_at (stream->class_stack,
stream->curr_class_stack_size - 1),
classname) == 0))
/* Improperly nested begin_span/end_span calls. */
abort ();
stream->curr_class_stack_size--;
}
/* Constructor. */
html_ostream_t
html_ostream_create (ostream_t destination)
{
html_ostream_t stream = XMALLOC (struct html_ostream_representation);
stream->base.vtable = &html_ostream_vtable;
stream->destination = destination;
stream->class_stack =
gl_list_create_empty (GL_ARRAY_LIST, NULL, NULL, NULL, true);
stream->curr_class_stack_size = 0;
stream->last_class_stack_size = 0;
stream->buflen = 0;
return stream;
}
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