TreeUtils.java 文件源码

/**
 * @see org.antlr.v4.runtime.tree.Trees.toStringTree(Tree, List<String>)
 */
public static String toStringTree(final Tree t, @Nullable final List<String> ruleNames, final int depth) {
    String s = Utils.escapeWhitespace(Trees.getNodeText(t, ruleNames), false);

    if (t.getChildCount() == 0) {
        return s;
    }

    final StringBuilder buf = new StringBuilder();

    if (depth > 0) {
        buf.append(NEWLINE);
    }

    buf.append(indent(depth));
    buf.append("(");
    s = Utils.escapeWhitespace(Trees.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, depth + 1));
    }

    buf.append(")");

    return buf.toString();
}