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https://issues.apache.org/jira/browse/GROOVY-11655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John updated GROOVY-11655:
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Summary: Create extension method to make StringBuilder like a stack (was:
Create extension method to make StringBuilder behaving like stack)
> Create extension method to make StringBuilder like a stack
> ----------------------------------------------------------
>
> Key: GROOVY-11655
> URL: https://issues.apache.org/jira/browse/GROOVY-11655
> Project: Groovy
> Issue Type: New Feature
> Reporter: John
> Priority: Major
>
> for leetcode problem:
> [https://leetcode.com/problems/design-a-text-editor/description/]
> the java code below, suppose StringBuilder to be a contain of chars ,
> meanwhile as a stack.
>
> {code:java}
> class TextEditor {
> private final StringBuilder left = new StringBuilder();
> private final StringBuilder right = new StringBuilder();
> public void addText(String text) {
> left.append(text);
> }
> public int deleteText(int k) {
> k = Math.min(k, left.length());
> left.setLength(left.length() - k);
> return k;
> }
> public String cursorLeft(int k) {
> while (k > 0 && !left.isEmpty()) {
> right.append(left.charAt(left.length() - 1));
> left.setLength(left.length() - 1);
> k--;
> }
> return text();
> }
> public String cursorRight(int k) {
> while (k > 0 && !right.isEmpty()) {
> left.append(right.charAt(right.length() - 1));
> right.setLength(right.length() - 1);
> k--;
> }
> return text();
> }
> private String text() {
>
> return left.substring(Math.max(left.length() - 10, 0));
> }
> }
> {code}
>
>
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