84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
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/*
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* Copyright (C) 2018-2019 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 "SBAssert.h"
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#include "SBBase.h"
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#include "ScriptStack.h"
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SB_INTERNAL void ScriptStackReset(ScriptStackRef stack)
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{
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stack->top = -1;
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stack->count = 0;
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stack->open = 0;
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}
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SB_INTERNAL void ScriptStackPush(ScriptStackRef stack, SBScript script, SBCodepoint mirror)
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{
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stack->count = SBNumberLimitIncrement(stack->count, _SBScriptStackCapacity);
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stack->open = SBNumberLimitIncrement(stack->open, _SBScriptStackCapacity);
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stack->top = SBNumberRingIncrement(stack->top, _SBScriptStackCapacity);
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stack->_elements[stack->top].script = script;
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stack->_elements[stack->top].mirror = mirror;
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}
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SB_INTERNAL void ScriptStackPop(ScriptStackRef stack)
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{
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/* There must be at least one entry in the stack. */
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SBAssert(stack->count > 0);
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stack->count -= 1;
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stack->open = SBNumberLimitDecrement(stack->open, 0);
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stack->top = SBNumberRingDecrement(stack->top, _SBScriptStackCapacity);
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if (ScriptStackIsEmpty(stack)) {
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stack->top = -1;
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}
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}
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SB_INTERNAL void ScriptStackLeavePairs(ScriptStackRef stack)
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{
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stack->open = 0;
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}
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SB_INTERNAL void ScriptStackSealPairs(ScriptStackRef stack, SBScript script)
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{
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SBInteger index = SBNumberRingSubtract(stack->top, (SBInteger)stack->open, _SBScriptStackCapacity);
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while (stack->open) {
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index = SBNumberRingIncrement(index, _SBScriptStackCapacity);
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stack->_elements[index].script = script;
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stack->open -= 1;
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}
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}
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SB_INTERNAL SBBoolean ScriptStackIsEmpty(ScriptStackRef stack)
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{
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return (stack->count == 0);
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}
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SB_INTERNAL SBScript ScriptStackGetScript(ScriptStackRef stack)
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{
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return stack->_elements[stack->top].script;
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}
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SB_INTERNAL SBCodepoint ScriptStackGetMirror(ScriptStackRef stack)
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{
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return stack->_elements[stack->top].mirror;
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}
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