Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import Color from '../../utils/Color';
/**
* Sorting Algorithm BubbleSort
*
* Implementation based on pseudo code from Wikipedia.
*
* @author Bernhard Frick
* @param {number[]} elements
* @param {boolean} testing Set to true to test the algorithm
* @return {number[] || {do: {}[], undo: {}[]}[]}
*/
export default function BubbleSort(elements, testing = false) {
const steps = [];
const output = Array.from(elements);
if (output.length === 0) {
return testing ? output : steps;
}
let j = output.length - 1;
// as long as there is an unsorted partition of the data...
while (j > 0) {
// loop over the unsorted partition of the data
for (let i = 0; i < j; i += 1) {
// compare elements i and i+1
steps.push({
do: [{
action: Action.SET_COLORS,
elements: [
{
index: i,
color: Color.BUBBLE_SORT_COMPARISON,
},
{
index: i + 1,
color: Color.BUBBLE_SORT_COMPARISON,
},
],
text: '',
}],
undo: [{
action: Action.SET_COLORS,
elements: [
{
index: i,
color: Color.BASE_COLOR_BAR_CHART,
},
{
index: i + 1,
color: Color.BASE_COLOR_BAR_CHART,
},
],
text: '',
}],
});
if (output[i] > output[i + 1]) {
// elements need to be exchanged
steps.push({
do: [{
action: Action.SET_COLORS,
elements: [
{
index: i,
color: Color.BUBBLE_SORT_COMPARISON_WRONG,
},
{
index: i + 1,
color: Color.BUBBLE_SORT_COMPARISON_WRONG,
},
],
text: '',
}],
undo: [{
action: Action.SET_COLORS,
elements: [
{
index: i,
color: Color.BUBBLE_SORT_COMPARISON,
},
{
index: i + 1,
color: Color.BUBBLE_SORT_COMPARISON,
},
],
text: '',
}],
});
// exchange elements
const temp = output[i];
output[i] = output[i + 1];
output[i + 1] = temp;
// create an exchange action
steps.push({
do: [{
action: Action.EXCHANGE,
elements: [i, i + 1],
text: '',
}],
undo: [{
action: Action.EXCHANGE,
elements: [i, i + 1],
text: '',
}],
});
} else {
// no exchange action required.
steps.push({
do: [{
action: Action.SET_COLORS,
elements: [
{
index: i,
color: Color.BUBBLE_SORT_COMPARISON_TRUE,
},
{
index: i + 1,
color: Color.BUBBLE_SORT_COMPARISON_TRUE,
},
],
text: '',
}],
undo: [{
action: Action.SET_COLORS,
elements: [
{
index: i,
color: Color.BUBBLE_SORT_COMPARISON,
},
{
index: i + 1,
color: Color.BUBBLE_SORT_COMPARISON,
},
],
text: '',
}],
});
}
// compare/exchange done
steps.push({
do: [{
action: Action.SET_COLORS,
elements: [
{
index: i,
color: Color.BASE_COLOR_BAR_CHART,
},
{
index: i + 1,
color: Color.BASE_COLOR_BAR_CHART,
},
],
text: '',
}],
undo: [{
action: Action.SET_COLORS,
elements: [
{
index: i,
color: Color.BUBBLE_SORT_COMPARISON_WRONG,
},
{
index: i + 1,
color: Color.BUBBLE_SORT_COMPARISON_WRONG,
},
],
text: '',
}],
});
}
// after one iteration, the last element of the list is sorted
steps.push({
do: [{
action: Action.SET_COLORS,
elements: [
{
index: j,
color: Color.BUBBLE_SORT_ELEMENT_SORTED,
},
],
text: `Element ${j} is sorted.`,
}],
undo: [{
action: Action.SET_COLORS,
elements: [
{
index: j,
color: Color.BASE_COLOR_BAR_CHART,
},
],
text: `Element ${j} is sorted.`,
}],
});
j -= 1;
}
// finally highlight the very last element, as it is also sorted.
steps.push({
do: [{
action: Action.SET_COLORS,
elements: [
{
index: j,
color: Color.BUBBLE_SORT_ELEMENT_SORTED,
},
],
text: `Element ${j} is sorted.`,
}],
undo: [{
action: Action.SET_COLORS,
elements: [
{
index: j,
color: Color.BASE_COLOR_BAR_CHART,
},
],
text: `Element ${j} is sorted.`,
}],
});
return testing ? output : steps;
}
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