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/*-
* ============LICENSE_START=======================================================
* ONAP - SO
* ================================================================================
* Copyright (C) 2017 - 2018 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=========================================================
*/
package org.onap.so.asdc.utils;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.antlr.v4.runtime.Parser;
import org.antlr.v4.runtime.ParserRuleContext;
import org.antlr.v4.runtime.RuleContext;
import org.antlr.v4.runtime.misc.Utils;
import org.antlr.v4.runtime.tree.ErrorNode;
import org.antlr.v4.runtime.tree.ParseTreeListener;
import org.antlr.v4.runtime.tree.TerminalNode;
import org.antlr.v4.runtime.tree.Trees;
public class TreePrinterListener implements ParseTreeListener {
private final List<String> ruleNames;
private final StringBuilder builder = new StringBuilder();
Map<RuleContext, ArrayList<String>> stack = new HashMap<RuleContext, ArrayList<String>>();
public TreePrinterListener(Parser parser) {
this.ruleNames = Arrays.asList(parser.getRuleNames());
}
public TreePrinterListener(List<String> ruleNames) {
this.ruleNames = ruleNames;
}
@Override
public void visitTerminal(TerminalNode node) {
String text = Utils.escapeWhitespace(Trees.getNodeText(node, ruleNames), false);
if (text.startsWith(" ") || text.endsWith(" ")) {
text = "'" + text + "'";
}
stack.get(node.getParent()).add(text);
}
@Override
public void visitErrorNode(ErrorNode node) {
stack.get(node.getParent()).add(Utils.escapeWhitespace(Trees.getNodeText(node, ruleNames), false));
}
@Override
public void enterEveryRule(ParserRuleContext ctx) {
if (!stack.containsKey(ctx.parent)) {
stack.put(ctx.parent, new ArrayList<String>());
}
if (!stack.containsKey(ctx)) {
stack.put(ctx, new ArrayList<String>());
}
final StringBuilder sb = new StringBuilder();
int ruleIndex = ctx.getRuleIndex();
String ruleName;
if (ruleIndex >= 0 && ruleIndex < ruleNames.size()) {
ruleName = ruleNames.get(ruleIndex);
} else {
ruleName = Integer.toString(ruleIndex);
}
sb.append(ruleName);
stack.get(ctx).add(sb.toString());
}
@Override
public void exitEveryRule(ParserRuleContext ctx) {
ArrayList<String> ruleStack = stack.remove(ctx);
StringBuilder sb = new StringBuilder();
boolean brackit = ruleStack.size() > 1;
if (brackit) {
sb.append("(");
}
sb.append(ruleStack.get(0));
for (int i = 1; i < ruleStack.size(); i++) {
sb.append(" ");
sb.append(ruleStack.get(i));
}
if (brackit) {
sb.append(")");
}
if (sb.length() < 80) {
stack.get(ctx.parent).add(sb.toString());
} else {
// Current line is too long, regenerate it using 1 line per item.
sb.setLength(0);
if (brackit) {
sb.append("(");
}
if (!ruleStack.isEmpty()) {
sb.append(ruleStack.remove(0)).append("\r\n");
}
while (!ruleStack.isEmpty()) {
sb.append(indent(ruleStack.remove(0))).append("\r\n");
}
if (brackit) {
sb.append(")");
}
stack.get(ctx.parent).add(sb.toString());
}
if (ctx.parent == null) {
builder.append(sb.toString());
}
}
static String indent(String input) {
return " " + input.replaceAll("\r\n(.)", "\r\n $1");
}
@Override
public String toString() {
return builder.toString();
}
}
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