1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17private fun String.toCamelCase(): String {
18    val split = this.split("_")
19    if (split.isEmpty()) return ""
20    if (split.size == 1) return split[0].capitalize()
21    return split.joinToCamelCase()
22}
23
24private fun String.toCamelCaseAsVar(): String {
25    val split = this.split("_")
26    if (split.isEmpty()) return ""
27    if (split.size == 1) return split[0]
28    return split.joinToCamelCaseAsVar()
29}
30
31private fun List<String>.joinToCamelCase(): String = when (size) {
32    0 -> throw IllegalArgumentException("invalid section size, cannot be zero")
33    1 -> this[0].toCamelCase()
34    else -> this.joinToString("") { it.toCamelCase() }
35}
36
37private fun List<String>.joinToCamelCaseAsVar(): String = when (size) {
38    0 -> throw IllegalArgumentException("invalid section size, cannot be zero")
39    1 -> this[0].toCamelCaseAsVar()
40    else -> get(0).toCamelCaseAsVar() + drop(1).joinToCamelCase()
41}
42
43private val javaCharRegex = "[^a-zA-Z0-9]".toRegex()
44fun String.stripNonJava(): String {
45    return this.split(javaCharRegex)
46            .map(String::trim)
47            .joinToCamelCaseAsVar()
48}
49