| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * 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.android.tools.lint.checks.infrastructure |
| |
| import java.util.regex.Pattern |
| |
| // Copy in metalava from lint to avoid compilation dependency directly on lint-tests |
| |
| /** A pair of package name and class name inferred from Java or Kotlin source code */ |
| class ClassName(source: String) { |
| val packageName: String? |
| val className: String? |
| |
| init { |
| val withoutComments = stripComments(source) |
| packageName = getPackage(withoutComments) |
| className = getClassName(withoutComments) |
| } |
| |
| @Suppress("unused") |
| fun packageNameWithDefault() = packageName ?: "" |
| } |
| |
| /** |
| * Strips line and block comments from the given Java or Kotlin source file |
| */ |
| @Suppress("LocalVariableName") |
| fun stripComments(source: String, stripLineComments: Boolean = true): String { |
| val sb = StringBuilder(source.length) |
| var state = 0 |
| val INIT = 0 |
| val INIT_SLASH = 1 |
| val LINE_COMMENT = 2 |
| val BLOCK_COMMENT = 3 |
| val BLOCK_COMMENT_ASTERISK = 4 |
| val IN_STRING = 5 |
| val IN_STRING_ESCAPE = 6 |
| val IN_CHAR = 7 |
| val AFTER_CHAR = 8 |
| for (c in source) { |
| when (state) { |
| INIT -> { |
| when (c) { |
| '/' -> state = INIT_SLASH |
| '"' -> { |
| state = IN_STRING |
| sb.append(c) |
| } |
| '\'' -> { |
| state = IN_CHAR |
| sb.append(c) |
| } |
| else -> sb.append(c) |
| } |
| } |
| INIT_SLASH -> { |
| when { |
| c == '*' -> state = BLOCK_COMMENT |
| c == '/' && stripLineComments -> state = LINE_COMMENT |
| else -> { |
| state = INIT |
| sb.append('/') // because we skipped it in init |
| sb.append(c) |
| } |
| } |
| } |
| LINE_COMMENT -> { |
| when (c) { |
| '\n' -> state = INIT |
| } |
| } |
| BLOCK_COMMENT -> { |
| when (c) { |
| '*' -> state = BLOCK_COMMENT_ASTERISK |
| } |
| } |
| BLOCK_COMMENT_ASTERISK -> { |
| state = when (c) { |
| '/' -> INIT |
| '*' -> BLOCK_COMMENT_ASTERISK |
| else -> BLOCK_COMMENT |
| } |
| } |
| IN_STRING -> { |
| when (c) { |
| '\\' -> state = IN_STRING_ESCAPE |
| '"' -> state = INIT |
| } |
| sb.append(c) |
| } |
| IN_STRING_ESCAPE -> { |
| sb.append(c) |
| state = IN_STRING |
| } |
| IN_CHAR -> { |
| if (c != '\\') { |
| state = AFTER_CHAR |
| } |
| sb.append(c) |
| } |
| AFTER_CHAR -> { |
| sb.append(c) |
| if (c == '\\') { |
| state = INIT |
| } |
| } |
| } |
| } |
| |
| return sb.toString() |
| } |
| |
| private val PACKAGE_PATTERN = Pattern.compile("""package\s+([\S&&[^;]]*)""") |
| |
| private val CLASS_PATTERN = Pattern.compile( |
| """(class|interface|enum|object)+?\s*([^\s:(]+)""", |
| Pattern.MULTILINE |
| ) |
| |
| fun getPackage(source: String): String? { |
| val matcher = PACKAGE_PATTERN.matcher(source) |
| return if (matcher.find()) { |
| matcher.group(1).trim() |
| } else { |
| null |
| } |
| } |
| |
| fun getClassName(source: String): String? { |
| val matcher = CLASS_PATTERN.matcher(source.replace('\n', ' ')) |
| var start = 0 |
| while (matcher.find(start)) { |
| val cls = matcher.group(2) |
| val groupStart = matcher.start(2) |
| |
| // Make sure this "class" reference isn't part of an annotation on the class |
| // referencing a class literal -- Foo.class, or in Kotlin, Foo::class.java) |
| if (groupStart == 0 || source[groupStart - 1] != '.' && source[groupStart - 1] != ':') { |
| val trimmed = cls.trim { it <= ' ' } |
| val typeParameter = trimmed.indexOf('<') |
| return if (typeParameter != -1) { |
| trimmed.substring(0, typeParameter) |
| } else { |
| trimmed |
| } |
| } |
| start = matcher.end(2) |
| } |
| |
| return null |
| } |