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
|
/*
* Copyright 2010-2015 JetBrains s.r.o.
*
* 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 org.jetbrains.kotlin.generators.builtins.progressions
import org.jetbrains.kotlin.generators.builtins.*
import org.jetbrains.kotlin.generators.builtins.generateBuiltIns.*
import org.jetbrains.kotlin.generators.builtins.ProgressionKind.*
import java.io.PrintWriter
class GenerateProgressions(out: PrintWriter) : BuiltInsSourceGenerator(out) {
override fun getPackage() = "kotlin.ranges"
private fun generateDiscreteBody(kind: ProgressionKind) {
val t = kind.capitalized
val progression = "${t}Progression"
val incrementType = progressionIncrementType(kind)
fun compare(v: String) = areEqualNumbers(v)
val zero = when (kind) {
LONG -> "0L"
else -> "0"
}
val checkZero = """if (step == $zero) throw kotlin.IllegalArgumentException("Step must be non-zero.")"""
val stepMinValue = "$incrementType.MIN_VALUE"
val checkMin = """if (step == $stepMinValue) throw kotlin.IllegalArgumentException("Step must be greater than $stepMinValue to avoid overflow on negation.")"""
val hashCode = "=\n" + when (kind) {
CHAR ->
" if (isEmpty()) -1 else (31 * (31 * first.toInt() + last.toInt()) + step)"
INT ->
" if (isEmpty()) -1 else (31 * (31 * first + last) + step)"
LONG ->
" if (isEmpty()) -1 else (31 * (31 * ${hashLong("first")} + ${hashLong("last")}) + ${hashLong("step")}).toInt()"
else -> throw IllegalArgumentException()
}
out.println(
"""/**
* A progression of values of type `$t`.
*/
public open class $progression
internal constructor
(
start: $t,
endInclusive: $t,
step: $incrementType
) : Iterable<$t> {
init {
$checkZero
$checkMin
}
/**
* The first element in the progression.
*/
public val first: $t = start
/**
* The last element in the progression.
*/
public val last: $t = getProgressionLastElement(start.to$incrementType(), endInclusive.to$incrementType(), step).to$t()
/**
* The step of the progression.
*/
public val step: $incrementType = step
override fun iterator(): ${t}Iterator = ${t}ProgressionIterator(first, last, step)
/** Checks if the progression is empty. */
public open fun isEmpty(): Boolean = if (step > 0) first > last else first < last
override fun equals(other: Any?): Boolean =
other is $progression && (isEmpty() && other.isEmpty() ||
${compare("first")} && ${compare("last")} && ${compare("step")})
override fun hashCode(): Int $hashCode
override fun toString(): String = ${"if (step > 0) \"\$first..\$last step \$step\" else \"\$first downTo \$last step \${-step}\""}
companion object {
/**
* Creates $progression within the specified bounds of a closed range.
* The progression starts with the [rangeStart] value and goes toward the [rangeEnd] value not excluding it, with the specified [step].
* In order to go backwards the [step] must be negative.
*
* [step] must be greater than `$stepMinValue` and not equal to zero.
*/
public fun fromClosedRange(rangeStart: $t, rangeEnd: $t, step: $incrementType): $progression = $progression(rangeStart, rangeEnd, step)
}
}""")
out.println()
}
override fun generateBody() {
out.println("import kotlin.internal.getProgressionLastElement")
out.println()
for (kind in ProgressionKind.values()) {
generateDiscreteBody(kind)
}
}
}
|
