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// Copyright 2021 Code Intelligence GmbH
//
// 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.
package com.code_intelligence.jazzer.autofuzz;
import java.util.Stack;
import java.util.stream.Collectors;
public class AutofuzzCodegenVisitor {
private final Stack<Group> groups = new Stack<>();
private int variableCounter = 0;
AutofuzzCodegenVisitor() {
init();
}
private void init() {
pushGroup("", "", "");
}
public void pushGroup(String prefix, String delimiter, String suffix) {
groups.push(new Group(prefix, delimiter, suffix));
}
public void pushElement(String element) {
groups.peek().push(element);
}
public void popElement() {
groups.peek().pop();
}
public void popGroup() {
if (groups.size() == 1) {
throw new AutofuzzError(
"popGroup must be called exactly once for every pushGroup: " + toDebugString());
}
pushElement(groups.pop().toString());
}
public String generate() {
if (groups.size() != 1) {
throw new AutofuzzError(
"popGroup must be called exactly once for every pushGroup: " + toDebugString());
}
return groups.pop().toString();
}
public void addCharLiteral(char c) {
pushElement("'" + escapeForLiteral(Character.toString(c)) + "'");
}
public void addStringLiteral(String string) {
pushElement('"' + escapeForLiteral(string) + '"');
}
public String uniqueVariableName() {
return String.format("autofuzzVariable%s", variableCounter++);
}
static String escapeForLiteral(String string) {
// The list of escape sequences is taken from:
// https://docs.oracle.com/javase/tutorial/java/data/characters.html
return string.replace("\\", "\\\\")
.replace("\t", "\\t")
.replace("\b", "\\b")
.replace("\n", "\\n")
.replace("\r", "\\r")
.replace("\f", "\\f")
.replace("\"", "\\\"")
.replace("'", "\\'");
}
private String toDebugString() {
return groups.stream()
.map(group -> group.elements.stream().collect(Collectors.joining(", ", "[", "]")))
.collect(Collectors.joining(", ", "[", "]"));
}
private static class Group {
private final String prefix;
private final String delimiter;
private final String suffix;
private final Stack<String> elements = new Stack<>();
Group(String prefix, String delimiter, String suffix) {
this.prefix = prefix;
this.delimiter = delimiter;
this.suffix = suffix;
}
public void push(String element) {
elements.push(element);
}
public void pop() {
elements.pop();
}
@Override
public String toString() {
return elements.stream().collect(Collectors.joining(delimiter, prefix, suffix));
}
}
}
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