#define PUTC(c) (*me->targetClass.put_character)(me->target, c)
/* #define PUTS(s) (*me->targetClass.put_string)(me->target, s) */
#define PUTB(s,l) (*me->targetClass.put_block)(me->target, s, l)
/* HTML Object
** -----------
*/
struct _HTStream {
CONST HTStreamClass * isa;
HTStream * target;
HTStreamClass targetClass; /* COPY for speed */
};
struct _HTStructured {
CONST HTStructuredClass * isa;
HTStream * target;
HTStreamClass targetClass; /* COPY for speed */
char buffer[BUFFER_SIZE+1]; /* 1for NL */
int buffer_maxchars;
char * write_pointer;
char * line_break [MAX_CLEANNESS+1];
int cleanness;
BOOL overflowed;
BOOL delete_line_break_char[MAX_CLEANNESS+1];
BOOL preformatted;
BOOL escape_specials;
BOOL in_attrval;
};
/* Flush Buffer
** ------------
*/
PRIVATE void flush_breaks ARGS1(
HTStructured *, me)
{
int i;
for (i=0; i<= MAX_CLEANNESS; i++) {
me->line_break[i] = NULL;
}
}
PRIVATE void HTMLGen_flush ARGS1(
HTStructured *, me)
{
(*me->targetClass.put_block)(me->target,
me->buffer,
me->write_pointer - me->buffer);
me->write_pointer = me->buffer;
flush_breaks(me);
me->cleanness = 0;
me->delete_line_break_char[0] = NO;
}
/* Weighted optional line break
**
** We keep track of all the breaks for when we chop the line
*/
PRIVATE void allow_break ARGS3(
HTStructured *, me,
int, new_cleanness,
BOOL, dlbc)
{
if (dlbc && me->write_pointer == me->buffer) dlbc = NO;
me->line_break[new_cleanness] =
dlbc ? me->write_pointer - 1 /* Point to space */
: me->write_pointer ; /* point to gap */
me->delete_line_break_char[new_cleanness] = dlbc;
if (new_cleanness >= me->cleanness &&
(me->overflowed || me->line_break[new_cleanness] > me->buffer))
me->cleanness = new_cleanness;
}
/* Character handling
** ------------------
**
** The tricky bits are the line break handling. This attempts
** to synchrononise line breaks on sentence or phrase ends. This
** is important if one stores SGML files in a line-oriented code
** repository, so that if a small change is made, line ends don't
** shift in a ripple-through to apparently change a large part of the
** file. We give extra "cleanness" to spaces appearing directly
** after periods (full stops), [semi]colons and commas.
** This should make the source files easier to read and modify
** by hand, too, though this is not a primary design consideration. TBL
*/
PRIVATE void HTMLGen_put_character ARGS2(
HTStructured *, me,
char, c)
{
if (me->escape_specials && (unsigned char)c < 32) {
if (c == HT_NON_BREAK_SPACE || c == HT_EM_SPACE ||
c == LY_SOFT_HYPHEN) { /* recursion... */
HTMLGen_put_character(me, '&');
HTMLGen_put_character(me, '#');
HTMLGen_put_character(me, 'x');
switch(c) {
case HT_NON_BREAK_SPACE: /* */
HTMLGen_put_character(me, 'A');
HTMLGen_put_character(me, '0');
break;
case HT_EM_SPACE: /* */
HTMLGen_put_character(me, '2');
HTMLGen_put_character(me, '0');
HTMLGen_put_character(me, '0');
HTMLGen_put_character(me, '3');
break;
case LY_SOFT_HYPHEN: /* */
HTMLGen_put_character(me, 'A');
HTMLGen_put_character(me, 'D');
break;
}
c = ';';
}
}
*me->write_pointer++ = c;
if (c == '\n') {
HTMLGen_flush(me);
return;
}
/* Figure our whether we can break at this point
*/
if ((!me->preformatted && (c == ' ' || c == '\t'))) {
int new_cleanness = 3;
if (me->write_pointer > (me->buffer + 1)) {
char delims[5];
char * p;
strcpy(delims, ",;:."); /* @@ english bias */
p = strchr(delims, me->write_pointer[-2]);
if (p) new_cleanness = p - delims + 6;
if (!me->in_attrval) new_cleanness += 10;
}
allow_break(me, new_cleanness, YES);
}
/*
* Flush buffer out when full, or whenever the line is over
* the nominal maximum and we can break at all
*/
if (me->write_pointer >= me->buffer + me->buffer_maxchars ||
(me->overflowed && me->cleanness)) {
if (me->cleanness) {
char line_break_char = me->line_break[me->cleanness][0];
char * saved = me->line_break[me->cleanness];
if (me->delete_line_break_char[me->cleanness]) saved++;
me->line_break[me->cleanness][0] = '\n';
(*me->targetClass.put_block)(me->target,
me->buffer,
me->line_break[me->cleanness] - me->buffer + 1);
me->line_break[me->cleanness][0] = line_break_char;
{ /* move next line in */
char * p = saved;
char *q;
for (q = me->buffer; p < me->write_pointer; )
*q++ = *p++;
}
me->cleanness = 0;
/* Now we have to check whether ther are any perfectly good breaks
** which weren't good enough for the last line but may be
** good enough for the next
*/
{
int i;
for(i=0; i <= MAX_CLEANNESS; i++) {
if (me->line_break[i] != NULL &&
me->line_break[i] > saved) {
me->line_break[i] = me->line_break[i] -
(saved-me->buffer);
me->cleanness = i;
} else {
me->line_break[i] = NULL;
}
}
}
me->delete_line_break_char[0] = 0;
me->write_pointer = me->write_pointer - (saved-me->buffer);
me->overflowed = NO;
} else {
(*me->targetClass.put_block)(me->target,
me->buffer,
me->buffer_maxchars);
me->write_pointer = me->buffer;
flush_breaks(me);
me->overflowed = YES;
}
}
}
/* String handling
** ---------------
*/
PRIVATE void HTMLGen_put_string ARGS2(
HTStructured *, me,
CONST char *, s)
{
CONST char * p;
for (p = s; *p; p++)
HTMLGen_put_character(me, *p);
}
PRIVATE void HTMLGen_write ARGS3(
HTStructured *, me,
CONST char *, s,
int, l)
{
CONST char * p;
for (p = s; p < (s + l); p++)
HTMLGen_put_character(me, *p);
}
/* Start Element
** -------------
**
** Within the opening tag, there may be spaces
** and the line may be broken at these spaces.
*/
PRIVATE void HTMLGen_start_element ARGS6(
HTStructured *, me,
int, element_number,
CONST BOOL*, present,
CONST char **, value,
int, charset GCC_UNUSED,
char **, insert GCC_UNUSED)
{
int i;
BOOL was_preformatted = me->preformatted;
HTTag * tag = &HTML_dtd.tags[element_number];
me->preformatted = YES; /* free text within tags */
HTMLGen_put_character(me, '<');
HTMLGen_put_string(me, tag->name);
if (present) {
BOOL had_attr = NO;
for (i = 0; i < tag->number_of_attributes; i++) {
if (present[i]) {
had_attr = YES;
HTMLGen_put_character(me, ' ');
allow_break(me, 11, YES);
HTMLGen_put_string(me, tag->attributes[i].name);
if (value[i]) {
me->preformatted = was_preformatted;
me->in_attrval = YES;
if (strchr(value[i], '"') == NULL) {
HTMLGen_put_string(me, "=\"");
HTMLGen_put_string(me, value[i]);
HTMLGen_put_character(me, '"');
} else if (strchr(value[i], '\'') == NULL) {
HTMLGen_put_string(me, "='");
HTMLGen_put_string(me, value[i]);
HTMLGen_put_character(me, '\'');
} else { /* attribute value has both kinds of quotes */
CONST char *p;
HTMLGen_put_string(me, "=\"");
for (p = value[i]; *p; p++) {
if (*p != '"') {
HTMLGen_put_character(me, *p);
} else {
HTMLGen_put_string(me, """);
}
}
HTMLGen_put_character(me, '"');
}
me->preformatted = YES;
me->in_attrval = NO;
}
}
}
if (had_attr)
allow_break(me, 12, NO);
}
HTMLGen_put_string(me, ">"); /* got rid of \n LJM */
/*
* Make very specific HTML assumption that PRE can't be nested!
*/
me->preformatted = (element_number == HTML_PRE) ? YES : was_preformatted;
/*
* Can break after element start.
*/
if (!me->preformatted && tag->contents != SGML_EMPTY) {
if (HTML_dtd.tags[element_number].contents == SGML_ELEMENT)
allow_break(me, 15, NO);
else
allow_break(me, 2, NO);
}
}
/* End Element
** -----------
**
*/
/* When we end an element, the style must be returned to that
** in effect before that element. Note that anchors (etc?)
** don't have an associated style, so that we must scan down the
** stack for an element with a defined style. (In fact, the styles
** should be linked to the whole stack not just the top one.)
** TBL 921119
*/
PRIVATE void HTMLGen_end_element ARGS3(
HTStructured *, me,
int, element_number,
char **, insert GCC_UNUSED)
{
if (!me->preformatted &&
HTML_dtd.tags[element_number].contents != SGML_EMPTY) {
/*
* Can break before element end.
*/
if (HTML_dtd.tags[element_number].contents == SGML_ELEMENT)
allow_break(me, 14, NO);
else
allow_break(me, 1, NO);
}
HTMLGen_put_string(me, "');
if (element_number == HTML_PRE) {
me->preformatted = NO;
}
}
/* Expanding entities
** ------------------
**
*/
PRIVATE int HTMLGen_put_entity ARGS2(
HTStructured *, me,
int, entity_number)
{
int nent = HTML_dtd.number_of_entities;
HTMLGen_put_character(me, '&');
if (entity_number < nent) {
HTMLGen_put_string(me, HTML_dtd.entity_names[entity_number]);
}
HTMLGen_put_character(me, ';');
return HT_OK;
}
/* Free an HTML object
** -------------------
**
*/
PRIVATE void HTMLGen_free ARGS1(
HTStructured *, me)
{
(*me->targetClass.put_character)(me->target, '\n');
HTMLGen_flush(me);
(*me->targetClass._free)(me->target); /* ripple through */
FREE(me);
}
PRIVATE void PlainToHTML_free ARGS1(
HTStructured *, me)
{
HTMLGen_end_element(me, HTML_PRE, 0);
HTMLGen_free(me);
}
PRIVATE void HTMLGen_abort ARGS2(
HTStructured *, me,
HTError, e GCC_UNUSED)
{
HTMLGen_free(me);
}
PRIVATE void PlainToHTML_abort ARGS2(
HTStructured *, me,
HTError, e GCC_UNUSED)
{
PlainToHTML_free(me);
}
/* Structured Object Class
** -----------------------
*/
PRIVATE CONST HTStructuredClass HTMLGeneration = /* As opposed to print etc */
{
"HTMLGen",
HTMLGen_free,
HTMLGen_abort,
HTMLGen_put_character, HTMLGen_put_string, HTMLGen_write,
HTMLGen_start_element, HTMLGen_end_element,
HTMLGen_put_entity
};
/* Subclass-specific Methods
** -------------------------
*/
extern int LYcols; /* LYCurses.h, set in LYMain.c */
extern BOOL dump_output_immediately; /* TRUE if no interactive user */
extern int dump_output_width; /* -width instead of 80 */
extern BOOLEAN LYPreparsedSource; /* Show source as preparsed? */
PUBLIC HTStructured * HTMLGenerator ARGS1(
HTStream *, output)
{
HTStructured* me = (HTStructured*)malloc(sizeof(*me));
if (me == NULL)
outofmem(__FILE__, "HTMLGenerator");
me->isa = &HTMLGeneration;
me->target = output;
me->targetClass = *me->target->isa; /* Copy pointers to routines for speed*/
me->write_pointer = me->buffer;
flush_breaks(me);
me->line_break[0] = me->buffer;
me->cleanness = 0;
me->overflowed = NO;
me->delete_line_break_char[0] = NO;
me->preformatted = NO;
me->in_attrval = NO;
/*
* For what line length should we attempt to wrap ? - kw
*/
if (!LYPreparsedSource) {
me->buffer_maxchars = 80; /* work as before - kw */
} else if (dump_output_width > 1) {
me->buffer_maxchars = dump_output_width; /* try to honor -width - kw */
} else if (dump_output_immediately) {
me->buffer_maxchars = 80; /* try to honor -width - kw */
} else {
me->buffer_maxchars = LYcols - 2;
if (me->buffer_maxchars < 38) /* too narrow, let GridText deal */
me->buffer_maxchars = 40;
}
if (me->buffer_maxchars > 900) /* likely not true - kw */
me->buffer_maxchars = 78;
if (me->buffer_maxchars > BUFFER_SIZE) /* must not be larger! */
me->buffer_maxchars = BUFFER_SIZE - 2;
/*
* If dump_output_immediately is set, there likely isn't anything
* after this stream to interpret the Lynx special chars. Also
* if they get displayed via HTPlain, that will probably make
* non-breaking space chars etc. invisible. So let's translate
* them to numerical character references. For debugging
* purposes we'll use the new hex format.
*/
me->escape_specials = LYPreparsedSource;
return me;
}
/* Stream Object Class
** -------------------
**
** This object just converts a plain text stream into HTML
** It is officially a structured strem but only the stream bits exist.
** This is just the easiest way of typecasting all the routines.
*/
PRIVATE CONST HTStructuredClass PlainToHTMLConversion =
{
"plaintexttoHTML",
HTMLGen_free,
PlainToHTML_abort,
HTMLGen_put_character,
HTMLGen_put_string,
HTMLGen_write,
NULL, /* Structured stuff */
NULL,
NULL
};
/* HTConverter from plain text to HTML Stream
** ------------------------------------------
*/
PUBLIC HTStream* HTPlainToHTML ARGS3(
HTPresentation *, pres GCC_UNUSED,
HTParentAnchor *, anchor GCC_UNUSED,
HTStream *, sink)
{
HTStructured *me = (HTStructured *)malloc(sizeof(*me));
if (me == NULL)
outofmem(__FILE__, "PlainToHTML");
me->isa = (CONST HTStructuredClass *)&PlainToHTMLConversion;
/*
* Copy pointers to routines for speed.
*/
me->target = sink;
me->targetClass = *me->target->isa;
me->write_pointer = me->buffer;
flush_breaks(me);
me->cleanness = 0;
me->overflowed = NO;
me->delete_line_break_char[0] = NO;
/* try to honor -width - kw */
me->buffer_maxchars = (dump_output_width > 1 ?
dump_output_width : 80);
HTMLGen_put_string(me, "\n\n\n");
me->preformatted = YES;
me->escape_specials = NO;
me->in_attrval = NO;
return (HTStream*) me;
}