Trees.java 文件源码

/** Print out a whole tree in LISP form. {@link #getNodeText} is used on the
 *  node payloads to get the text for the nodes.  Detect
 *  parse trees and extract data appropriately.
 */
public static String toStringTree(@NotNull Tree t, @Nullable List<String> ruleNames) {
    String s = Utils.escapeWhitespace(getNodeText(t, ruleNames), false);
    if ( t.getChildCount()==0 ) return s;
    StringBuilder buf = new StringBuilder();
    buf.append("(");
    s = Utils.escapeWhitespace(getNodeText(t, ruleNames), false);
    buf.append(s);
    buf.append(' ');
    for (int i = 0; i<t.getChildCount(); i++) {
        if ( i>0 ) buf.append(' ');
        buf.append(toStringTree(t.getChild(i), ruleNames));
    }
    buf.append(")");
    return buf.toString();
}