size_t fixed_memory_sweep(Memory *mem) {
Array *stack = mem->stack;
Array *from = mem->heap;
Array *to = from==&mem->h1 ? &mem->h2 : &mem->h1;
Object scanned;
size_t from_size, to_size;
from_size = from->current - from->head;
to->current = to->head;
/* copy objects referenced by root set(stack-space). */
copy_space(stack, to);
/* to-space has gray color objects.
* copy objects referenced by gray color objects. */
copy_space(to, to);
to_size = to->current - to->head;
scanned = from->head;
while(scanned!=from->current) {
/* obj is garbage if TYPE(obj)!=T_FORWARD */
if(TYPE(scanned)==T_STR) {
free(STR_BUF(scanned));
}
++scanned;
}
mem->heap = to;
return from_size - to_size;
}
/*
* Copy space if exists
*/
static int
copy_space_optional(const rchar **source_, rchar **target_,
rcssmin_ctx_t *ctx)
{
const rchar *source = *source_;
if (!(source < ctx->sentinel))
return -1;
if (*source == U('/')) {
*source_ = source + 1;
return copy_space_comment(source_, target_, ctx, NEED_SPACE_NEVER);
}
else if (RCSSMIN_IS_SPACE(*source)) {
*source_ = source + 1;
copy_space(source_, target_, ctx, NEED_SPACE_NEVER);
return 0;
}
return -1;
}
/*
* Copy space if comment
*/
static int
copy_space_comment(const rchar **source_, rchar **target_,
rcssmin_ctx_t *ctx, need_space_flag need_space)
{
const rchar *source = *source_;
rchar *target = *target_;
if (source < ctx->sentinel && *source == U('*')) {
copy_space(source_, target_, ctx, need_space);
if (*source_ > source)
return 0;
}
if (!(target < ctx->tsentinel))
RABORT(-1);
*target++ = source[-1];
/* *source_ = source; <-- unchanged */
*target_ = target;
return -1;
}
/*
* Main function
*
* The return value determines the result length (kept in the target buffer).
* However, if the target buffer is too small, the return value is greater
* than tlength. The difference to tlength is the number of unconsumed source
* characters at the time the buffer was full. In this case you should resize
* the target buffer to the return value and call rcssmin again. Repeat as
* often as needed.
*/
static Py_ssize_t
rcssmin(const rchar *source, rchar *target, Py_ssize_t slength,
Py_ssize_t tlength, int keep_bang_comments)
{
rcssmin_ctx_t ctx_, *ctx = &ctx_;
const rchar *tstart = target;
rchar c;
ctx->start = source;
ctx->sentinel = source + slength;
ctx->tsentinel = target + tlength;
ctx->at_group = 0;
ctx->in_macie5 = 0;
ctx->in_rule = 0;
ctx->keep_bang_comments = keep_bang_comments;
while (source < ctx->sentinel && target < ctx->tsentinel) {
c = *source++;
if (RCSSMIN_IS_DULL(c)) {
*target++ = c;
continue;
}
else if (RCSSMIN_IS_SPACE(c)) {
copy_space(&source, &target, ctx, NEED_SPACE_MAYBE);
continue;
}
switch (c) {
/* Escape */
case U('\\'):
copy_escape(&source, &target, ctx);
continue;
/* String */
case U('"'): case U('\''):
copy_string(&source, &target, ctx);
continue;
/* URL */
case U('u'):
copy_url(&source, &target, ctx);
continue;
/* IE7hack */
case U('>'):
copy_ie7hack(&source, &target, ctx);
continue;
/* @-group */
case U('@'):
copy_at_group(&source, &target, ctx);
continue;
/* ; */
case U(';'):
copy_semicolon(&source, &target, ctx);
continue;
/* :first-line|letter followed by [{,] */
/* (apparently needed for IE6) */
case U(':'):
copy_first(&source, &target, ctx);
continue;
/* { */
case U('{'):
if (ctx->at_group)
--ctx->at_group;
else
++ctx->in_rule;
*target++ = c;
continue;
/* } */
case U('}'):
if (ctx->in_rule)
--ctx->in_rule;
*target++ = c;
continue;
/* space starting with comment */
case U('/'):
(void)copy_space_comment(&source, &target, ctx, NEED_SPACE_MAYBE);
continue;
/* Fallback: copy character. Better safe than sorry. Should not be
* reached, though */
default:
*target++ = c;
continue;
}
}
return
(Py_ssize_t)(target - tstart) + (Py_ssize_t)(ctx->sentinel - source);
}