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/*
* Copyright 2010-2012 Adrian Thurston <thurston@complang.org>
*/
#include <colm/rtvector.h>
#include <colm/pdarun.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
void initRtCodeVect( RtCodeVect *vect )
{
vect->data = 0;
vect->tabLen = 0;
vect->allocLen = 0;
}
static long newSizeUp( long existing, long needed )
{
return needed > existing ? (needed<<1) : existing;
}
static long newSizeDown( long existing, long needed )
{
return needed < (existing>>2) ? (needed<<1) : existing;
}
/* Up resize the data for len elements using Resize::upResize to tell us the
* new tabLen. Reads and writes allocLen. Does not read or write tabLen. */
static void upResize( RtCodeVect *vect, long len )
{
/* Ask the resizer what the new tabLen will be. */
long newLen = newSizeUp(vect->allocLen, len);
/* Did the data grow? */
if ( newLen > vect->allocLen ) {
vect->allocLen = newLen;
if ( vect->data != 0 ) {
/* Table exists already, resize it up. */
vect->data = (Code*) realloc( vect->data, sizeof(Code) * newLen );
//if ( vect->data == 0 )
// throw std::bad_alloc();
}
else {
/* Create the data. */
vect->data = (Code*) malloc( sizeof(Code) * newLen );
//if ( vect->data == 0 )
// throw std::bad_alloc();
}
}
}
/* Down resize the data for len elements using Resize::downResize to determine
* the new tabLen. Reads and writes allocLen. Does not read or write tabLen. */
static void downResize( RtCodeVect *vect, long len)
{
/* Ask the resizer what the new tabLen will be. */
long newLen = newSizeDown( vect->allocLen, len );
/* Did the data shrink? */
if ( newLen < vect->allocLen ) {
vect->allocLen = newLen;
if ( newLen == 0 ) {
/* Simply free the data. */
free( vect->data );
vect->data = 0;
}
else {
/* Not shrinking to size zero, realloc it to the smaller size. */
vect->data = (Code*) realloc( vect->data, sizeof(Code) * newLen );
//if ( vect->data == 0 )
// throw std::bad_alloc();
}
}
}
void rtCodeVectEmpty( RtCodeVect *vect )
{
if ( vect->data != 0 ) {
/* Free the data space. */
free( vect->data );
vect->data = 0;
vect->tabLen = vect->allocLen = 0;
}
}
void rtCodeVectReplace( RtCodeVect *vect, long pos, const Code *val, long len )
{
long endPos, i;
//Code *item;
/* If we are given a negative position to replace at then
* treat it as a position relative to the length. */
if ( pos < 0 )
pos = vect->tabLen + pos;
/* The end is the one past the last item that we want
* to write to. */
endPos = pos + len;
/* Make sure we have enough space. */
if ( endPos > vect->tabLen ) {
upResize( vect, endPos );
/* Delete any objects we need to delete. */
//item = vect->data + pos;
//for ( i = pos; i < vect->tabLen; i++, item++ )
// item->~Code();
/* We are extending the vector, set the new data length. */
vect->tabLen = endPos;
}
else {
/* Delete any objects we need to delete. */
//item = vect->data + pos;
//for ( i = pos; i < endPos; i++, item++ )
// item->~Code();
}
/* Copy data in using copy constructor. */
Code *dst = vect->data + pos;
const Code *src = val;
for ( i = 0; i < len; i++, dst++, src++ )
*dst = *src;
}
void rtCodeVectRemove( RtCodeVect *vect, long pos, long len )
{
long newLen, lenToSlideOver, endPos;
Code *dst;//, *item;
/* If we are given a negative position to remove at then
* treat it as a position relative to the length. */
if ( pos < 0 )
pos = vect->tabLen + pos;
/* The first position after the last item deleted. */
endPos = pos + len;
/* The new data length. */
newLen = vect->tabLen - len;
/* The place in the data we are deleting at. */
dst = vect->data + pos;
/* Call Destructors. */
//item = dst;
//for ( long i = 0; i < len; i += 1, item += 1 )
// item->~Code();
/* Shift data over if necessary. */
lenToSlideOver = vect->tabLen - endPos;
if ( len > 0 && lenToSlideOver > 0 )
memmove(dst, dst + len, sizeof(Code)*lenToSlideOver);
/* Shrink the data if necessary. */
downResize( vect, newLen );
/* Set the new data length. */
vect->tabLen = newLen;
}
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