112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
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/*
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* Copyright (C) 2014-2019 Muhammad Tayyab Akram
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <SBConfig.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include "SBAssert.h"
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#include "SBBase.h"
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#include "StatusStack.h"
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SB_INTERNAL void StatusStackInitialize(StatusStackRef stack)
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{
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stack->_firstList.previous = NULL;
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stack->_firstList.next = NULL;
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StatusStackSetEmpty(stack);
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}
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SB_INTERNAL void StatusStackPush(StatusStackRef stack, SBLevel embeddingLevel, SBBidiType overrideStatus, SBBoolean isolateStatus)
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{
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_SBStatusStackElementRef element;
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/* The stack can hold upto 127 elements. */
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SBAssert(stack->count <= 127);
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if (stack->_peekTop != _SBStatusStackList_MaxIndex) {
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element = &stack->_peekList->elements[++stack->_peekTop];
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} else {
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_SBStatusStackListRef previousList = stack->_peekList;
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_SBStatusStackListRef peekList = previousList->next;
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if (!peekList) {
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peekList = malloc(sizeof(_SBStatusStackList));
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peekList->previous = previousList;
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peekList->next = NULL;
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previousList->next = peekList;
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}
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stack->_peekList = peekList;
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stack->_peekTop = 0;
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element = &peekList->elements[0];
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}
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stack->count += 1;
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element->embeddingLevel = embeddingLevel;
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element->overrideStatus = overrideStatus;
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element->isolateStatus = isolateStatus;
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}
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SB_INTERNAL void StatusStackPop(StatusStackRef stack)
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{
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/* The stack should not be empty. */
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SBAssert(stack->count != 0);
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if (stack->_peekTop != 0) {
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stack->_peekTop -= 1;
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} else {
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stack->_peekList = stack->_peekList->previous;
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stack->_peekTop = _SBStatusStackList_MaxIndex;
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}
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stack->count -= 1;
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}
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SB_INTERNAL void StatusStackSetEmpty(StatusStackRef stack)
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{
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stack->_peekList = &stack->_firstList;
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stack->_peekTop = 0;
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stack->count = 0;
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}
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SB_INTERNAL SBLevel StatusStackGetEmbeddingLevel(StatusStackRef stack)
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{
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return stack->_peekList->elements[stack->_peekTop].embeddingLevel;
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}
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SB_INTERNAL SBBidiType StatusStackGetOverrideStatus(StatusStackRef stack)
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{
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return stack->_peekList->elements[stack->_peekTop].overrideStatus;
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}
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SB_INTERNAL SBBoolean StatusStackGetIsolateStatus(StatusStackRef stack)
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{
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return stack->_peekList->elements[stack->_peekTop].isolateStatus;
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}
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SB_INTERNAL void StatusStackFinalize(StatusStackRef stack)
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{
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_SBStatusStackListRef list = stack->_firstList.next;
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while (list) {
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_SBStatusStackListRef next = list->next;
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free(list);
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list = next;
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};
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}
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