1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/*
* Copyright 2015 Google Inc.
*
* 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.
*/
// This was copied from https://github.com/google/google-java-format and converted to Kotlin,
// because the original is package-private.
package com.facebook.ktfmt.format
import com.google.common.base.Verify
import java.util.Optional
/** Heuristics for classifying qualified names as types. */
object TypeNameClassifier {
/** A state machine for classifying qualified names. */
private enum class TyParseState(val isSingleUnit: Boolean) {
/** The start state. */
START(false) {
override fun next(n: JavaCaseFormat): TyParseState {
return when (n) {
JavaCaseFormat.UPPERCASE ->
// if we see an UpperCamel later, assume this was a class
// e.g. com.google.FOO.Bar
AMBIGUOUS
JavaCaseFormat.LOWER_CAMEL -> REJECT
JavaCaseFormat.LOWERCASE ->
// could be a package
START
JavaCaseFormat.UPPER_CAMEL -> TYPE
}
}
},
/** The current prefix is a type. */
TYPE(true) {
override fun next(n: JavaCaseFormat): TyParseState {
return when (n) {
JavaCaseFormat.UPPERCASE,
JavaCaseFormat.LOWER_CAMEL,
JavaCaseFormat.LOWERCASE -> FIRST_STATIC_MEMBER
JavaCaseFormat.UPPER_CAMEL -> TYPE
}
}
},
/** The current prefix is a type, followed by a single static member access. */
FIRST_STATIC_MEMBER(true) {
override fun next(n: JavaCaseFormat): TyParseState {
return REJECT
}
},
/** Anything not represented by one of the other states. */
REJECT(false) {
override fun next(n: JavaCaseFormat): TyParseState {
return REJECT
}
},
/** An ambiguous type prefix. */
AMBIGUOUS(false) {
override fun next(n: JavaCaseFormat): TyParseState {
return when (n) {
JavaCaseFormat.UPPERCASE -> AMBIGUOUS
JavaCaseFormat.LOWER_CAMEL,
JavaCaseFormat.LOWERCASE -> REJECT
JavaCaseFormat.UPPER_CAMEL -> TYPE
}
}
};
/** Transition function. */
abstract fun next(n: JavaCaseFormat): TyParseState
}
/**
* Returns the end index (inclusive) of the longest prefix that matches the naming conventions of
* a type or static field access, or -1 if no such prefix was found.
*
* Examples:
* * ClassName
* * ClassName.staticMemberName
* * com.google.ClassName.InnerClass.staticMemberName
*/
internal fun typePrefixLength(nameParts: List<String>): Optional<Int> {
var state = TyParseState.START
var typeLength = Optional.empty<Int>()
for (i in nameParts.indices) {
state = state.next(JavaCaseFormat.from(nameParts[i]))
if (state === TyParseState.REJECT) {
break
}
if (state.isSingleUnit) {
typeLength = Optional.of(i)
}
}
return typeLength
}
/** Case formats used in Java identifiers. */
enum class JavaCaseFormat {
UPPERCASE,
LOWERCASE,
UPPER_CAMEL,
LOWER_CAMEL;
companion object {
/** Classifies an identifier's case format. */
internal fun from(name: String): JavaCaseFormat {
Verify.verify(name.isNotEmpty())
var firstUppercase = false
var hasUppercase = false
var hasLowercase = false
var first = true
for (char in name) {
if (!Character.isAlphabetic(char.code)) {
continue
}
if (first) {
firstUppercase = Character.isUpperCase(char)
first = false
}
hasUppercase = hasUppercase or Character.isUpperCase(char)
hasLowercase = hasLowercase or Character.isLowerCase(char)
}
return if (firstUppercase) {
if (hasLowercase) UPPER_CAMEL else UPPERCASE
} else {
if (hasUppercase) LOWER_CAMEL else LOWERCASE
}
}
}
}
}
|
