| 1 | export const frameStack = [];
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| 2 | export function topmost() {
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| 3 | if (frameStack.length > 0) {
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| 4 | return frameStack[frameStack.length - 1];
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| 5 | }
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| 6 | return undefined;
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| 7 | }
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| 8 | export function _pushInFrameStack(frame) {
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| 9 | if (frame._isInFrameStack && frameStack[frameStack.length - 1] === frame) {
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| 10 | return;
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| 11 | }
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| 12 | if (frame._isInFrameStack) {
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| 13 | const indexOfFrame = frameStack.indexOf(frame);
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| 14 | frameStack.splice(indexOfFrame, 1);
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| 15 | }
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| 16 | frameStack.push(frame);
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| 17 | frame._isInFrameStack = true;
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| 18 | }
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| 19 | export function _popFromFrameStack(frame) {
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| 20 | if (!frame._isInFrameStack) {
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| 21 | return;
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| 22 | }
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| 23 | const top = topmost();
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| 24 | if (top !== frame) {
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| 25 | throw new Error('Cannot pop a Frame which is not at the top of the navigation stack.');
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| 26 | }
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| 27 | frameStack.pop();
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| 28 | frame._isInFrameStack = false;
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| 29 | }
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| 30 | export function _removeFromFrameStack(frame) {
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| 31 | if (!frame._isInFrameStack) {
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| 32 | return;
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| 33 | }
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| 34 | const index = frameStack.indexOf(frame);
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| 35 | frameStack.splice(index, 1);
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| 36 | frame._isInFrameStack = false;
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| 37 | }
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| 38 | |
| \ | No newline at end of file |