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MiniParser.java
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MiniParser.java
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package src.java.medium.string;
import java.util.ArrayList;
/**
* // This is the interface that allows for creating nested lists. // You should
* not implement it, or speculate about its implementation public interface
* NestedInteger { // Constructor initializes an empty nested list. public
* NestedInteger();
*
* // Constructor initializes a single integer. public NestedInteger(int value);
*
* // @return true if this NestedInteger holds a single integer, rather than a
* nested list. public boolean isInteger();
*
* // @return the single integer that this NestedInteger holds, if it holds a
* single integer // Return null if this NestedInteger holds a nested list
* public Integer getInteger();
*
* // Set this NestedInteger to hold a single integer. public void
* setInteger(int value);
*
* // Set this NestedInteger to hold a nested list and adds a nested integer to
* it. public void add(NestedInteger ni);
*
* // @return the nested list that this NestedInteger holds, if it holds a
* nested list // Return null if this NestedInteger holds a single integer
* public List<NestedInteger> getList(); }
*/
public class MiniParser {
public NestedInteger deserialize(String s) {
NestedInteger ret = new NestedInteger();
if (s.startsWith("[")) {
ArrayList<String> list = split(s);
for (String str : list) {
ret.add(deserialize(str));
}
} else {
ret.setInteger(Integer.parseInt(s));
}
return ret;
}
private ArrayList<String> split(String s) {
s = s.substring(1, s.length() - 1);
ArrayList<String> list = new ArrayList<>();
int i = 0;
int j = 1;
while (i < s.length()) {
if (s.charAt(i) == '[') {
int count = 1;
while (j < s.length() && count != 0) {
if (s.charAt(j) == '[') {
count++;
} else if (s.charAt(j) == ']') {
count--;
}
j++;
}
list.add(s.substring(i, j));
i = j++;
} else if (s.charAt(i) == ',') {
i++;
j++;
} else {
while (j < s.length() && s.charAt(j) != ',') {
j++;
}
list.add(s.substring(i, j++));
i = j++;
}
}
return list;
}
}