String*
Str_Trim_IMP(String *self) {
StringIterator *top = STACK_ITER(self, 0);
StrIter_Skip_Whitespace(top);
StringIterator *tail = NULL;
if (top->byte_offset < self->size) {
tail = STACK_ITER(self, self->size);
StrIter_Skip_Whitespace_Back(tail);
}
return StrIter_crop((StringIterator*)top, (StringIterator*)tail);
}
int32_t
Str_Code_Point_From_IMP(String *self, size_t tick) {
if (tick == 0) { return STR_OOB; }
StringIterator *iter = STACK_ITER(self, self->size);
StrIter_Recede(iter, tick - 1);
return StrIter_Prev(iter);
}
int64_t
Str_BaseX_To_I64_IMP(String *self, uint32_t base) {
StringIterator *iter = STACK_ITER(self, 0);
int64_t retval = 0;
bool is_negative = false;
int32_t code_point = StrIter_Next(iter);
// Advance past minus sign.
if (code_point == '-') {
code_point = StrIter_Next(iter);
is_negative = true;
}
// Accumulate.
while (code_point != STR_OOB) {
if (code_point <= 127 && isalnum(code_point)) {
int32_t addend = isdigit(code_point)
? code_point - '0'
: tolower(code_point) - 'a' + 10;
if (addend >= (int32_t)base) { break; }
retval *= base;
retval += addend;
}
else {
break;
}
code_point = StrIter_Next(iter);
}
// Apply minus sign.
if (is_negative) { retval = 0 - retval; }
return retval;
}
String*
Str_SubString_IMP(String *self, size_t offset, size_t len) {
StringIterator *iter = STACK_ITER(self, 0);
StrIter_Advance(iter, offset);
size_t start_offset = iter->byte_offset;
StrIter_Advance(iter, len);
size_t size = iter->byte_offset - start_offset;
return S_new_substring(self, start_offset, size);
}
size_t
Str_Hash_Sum_IMP(String *self) {
size_t hashvalue = 5381;
StringIterator *iter = STACK_ITER(self, 0);
const StrIter_Next_t next = METHOD_PTR(STRINGITERATOR, CFISH_StrIter_Next);
int32_t code_point;
while (STR_OOB != (code_point = next(iter))) {
hashvalue = ((hashvalue << 5) + hashvalue) ^ (size_t)code_point;
}
return hashvalue;
}
/*
* Pop an elem off the stack and deallocate its memory. Returns the integer
* offset into the history list of the popped frame. Returns RSH_ERR if there
* is an error (empty stack).
*/
int rsh_stack_pop(struct rsh_history_stack *stack){
int frame_data;
struct rsh_history_frame *frame;
if ( ! stack->top )
return RSH_ERR;
frame = stack->top;
frame_data = stack->top->text;
STACK_ITER(stack->top);
free(frame);
return frame_data;
}
/*
* Clean a stack up.
*/
void rsh_stack_clean(struct rsh_history_stack *stack){
struct rsh_history_frame *frame;
struct rsh_history_frame *tmp;
if ( ! stack->top )
return;
frame = stack->top;
while ( frame != NULL){
tmp = frame;
STACK_ITER(frame);
free(tmp);
}
stack->top = NULL;
return;
}
int32_t
Str_Code_Point_At_IMP(String *self, size_t tick) {
StringIterator *iter = STACK_ITER(self, 0);
StrIter_Advance(iter, tick);
return StrIter_Next(iter);
}
size_t
Str_Length_IMP(String *self) {
StringIterator *iter = STACK_ITER(self, 0);
return StrIter_Advance(iter, SIZE_MAX);
}
String*
Str_Trim_Tail_IMP(String *self) {
StringIterator *tail = STACK_ITER(self, self->size);
StrIter_Skip_Whitespace_Back(tail);
return StrIter_crop(NULL, (StringIterator*)tail);
}
String*
Str_Trim_Top_IMP(String *self) {
StringIterator *top = STACK_ITER(self, 0);
StrIter_Skip_Whitespace(top);
return StrIter_crop((StringIterator*)top, NULL);
}
