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Correctly handle invalid strings.

This commit is contained in:
Danila Fedorin 2017-07-26 13:25:12 -07:00
parent 7c4ecdc1db
commit 9ce35aad54

View File

@ -129,7 +129,9 @@ public abstract class TreeNode {
* @return the resulting tree. * @return the resulting tree.
*/ */
public static TreeNode fromString(String string){ public static TreeNode fromString(String string){
ArrayList<Match<TokenType>> matches = intoPostfix(string, tokenize(string)); ArrayList<Match<TokenType>> matches = tokenize(string);
if(matches == null) return null;
matches = intoPostfix(string, matches);
if(matches == null) return null; if(matches == null) return null;
Collections.reverse(matches); Collections.reverse(matches);