androidx.compose.compiler.plugins.kotlin.analysis.StabilityExternalClassNameMatching.kt Maven / Gradle / Ivy
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Compiler plugin that enables Compose
/*
* Copyright 2023 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 androidx.compose.compiler.plugins.kotlin.analysis
import org.jetbrains.kotlin.ir.types.IrType
import org.jetbrains.kotlin.ir.types.classFqName
import org.jetbrains.kotlin.name.FqName
internal const val STABILITY_WILDCARD_SINGLE = '*'
internal const val STABILITY_WILDCARD_MULTI = "**"
internal const val STABILITY_GENERIC_OPEN = '<'
internal const val STABILITY_GENERIC_CLOSE = '>'
internal const val STABILITY_GENERIC_INCLUDE = "*"
internal const val STABILITY_GENERIC_EXCLUDE = "_"
internal const val STABILITY_GENERIC_SEPARATOR = ","
internal const val STABILITY_PACKAGE_SEPARATOR = '.'
class FqNameMatcherCollection(private val matchers: Set) {
// Cache of external types already matched
private val externalTypesMatched: MutableMap = mutableMapOf()
// Tree of matchers for fast lookup
private val matcherTree = MutableMatcherTree()
init {
matcherTree.putAll(matchers)
}
fun maskForName(name: FqName?): Int? {
if (name == null) return null
return matcherTree.findFirstPositiveMatcher(name)?.mask
}
fun matches(name: FqName?, superTypes: List): Boolean {
if (matchers.isEmpty()) return false
if (name == null) return false
externalTypesMatched[name]?.let {
return it
}
val superTypeNames = superTypes.mapNotNull { it.classFqName }
return (matcherTree.findFirstPositiveMatcher(name) != null ||
superTypeNames.any { superName ->
matcherTree.findFirstPositiveMatcher(superName) != null
})
.also {
externalTypesMatched[name] = it
}
}
}
/**
* A tree of matchers for faster lookup.
* The tree is structured around package segments. e.g. com.google.foo = com -> google -> foo
* Because multiple matchers could match the same fqName due to wildcards, matchers are
* stored in the tree at the point of their first wildcard. In the case of no wildcards,
* matchers are stored at the end of the branch.
*/
private class MutableMatcherTree {
private val root = Node()
fun putAll(matchers: Iterable) {
matchers.forEach { put(it) }
}
fun put(matcher: FqNameMatcher) {
var node: Node = root
for (c in matcher.key) {
node = node.children.getOrPut(c) { Node() }
}
node.values.add(matcher)
}
fun findFirstPositiveMatcher(fqName: FqName): FqNameMatcher? {
val segments = fqName.asString()
var currSegmentIndex = 0
var currNode: Node? = root
while (currNode != null) {
val segment = segments.getOrNull(currSegmentIndex)
for (i in 0 until currNode.values.size) {
val matcher = currNode.values[i]
if (matcher.matches(fqName)) return matcher
}
if (segment != null) {
currNode = currNode.children[segment]
currSegmentIndex++
} else {
currNode = null
}
}
return null
}
private class Node {
val children = mutableMapOf()
val values = mutableListOf()
}
}
class FqNameMatcher(val pattern: String) {
/**
* A key for storing this matcher.
*/
val key: String
/**
* Mask for generic type inclusion in stability calculation
*/
val mask: Int
private val regex: Regex?
init {
val matchResult = validPatternMatcher.matchEntire(pattern)
?: error("$pattern is not a valid pattern")
val regexPatternBuilder = StringBuilder()
val keyBuilder = StringBuilder()
var hasWildcard = false
var index = 0
var hitGenericOpener = false
while (index < pattern.length && !hitGenericOpener) {
when (val c = pattern[index]) {
STABILITY_WILDCARD_SINGLE -> {
hasWildcard = true
if (pattern.getOrNull(index + 1) == STABILITY_WILDCARD_SINGLE) {
regexPatternBuilder.append(PATTERN_MULTI_WILD)
index++ // Skip a char to take the multi
} else {
regexPatternBuilder.append(PATTERN_SINGLE_WILD)
}
}
STABILITY_PACKAGE_SEPARATOR -> {
if (hasWildcard) {
regexPatternBuilder.append(PATTERN_PACKAGE_SEGMENT)
} else {
keyBuilder.append(STABILITY_PACKAGE_SEPARATOR)
}
}
STABILITY_GENERIC_OPEN -> {
hitGenericOpener = true
}
else -> {
if (hasWildcard) {
regexPatternBuilder.append(c)
} else {
keyBuilder.append(c)
}
}
}
index++
}
// Pre-alloc regex for pattern having a wildcard at the end of the string
// because it should be common.
regex = if (regexPatternBuilder.isNotEmpty()) {
when (val regexPattern = regexPatternBuilder.toString()) {
singleWildcardSuffix.pattern -> singleWildcardSuffix
multiWildcardSuffix.pattern -> multiWildcardSuffix
else -> Regex(regexPattern)
}
} else {
null
}
val genericMask = matchResult.groups["genericmask"]
if (genericMask == null) {
key = keyBuilder.toString()
mask = 0.inv()
} else {
mask = genericMask.value
.split(STABILITY_GENERIC_SEPARATOR)
.map { if (it == STABILITY_GENERIC_INCLUDE) 1 else 0 }
.reduceIndexed { i, acc, flag ->
acc or (flag shl i)
}
key = keyBuilder.subSequence(0, genericMask.range.first - 1).toString()
}
}
fun matches(name: FqName?): Boolean {
if (pattern == STABILITY_WILDCARD_MULTI) return true
val nameStr = name?.asString() ?: return false
val suffix = nameStr.substring(key.length)
return when {
regex != null -> nameStr.startsWith(key) && regex.matches(suffix)
else -> key == name.asString()
}
}
override fun equals(other: Any?): Boolean {
val otherMatcher = other as? FqNameMatcher ?: return false
return this.pattern == otherMatcher.pattern
}
override fun hashCode(): Int {
return pattern.hashCode()
}
companion object {
private const val PATTERN_SINGLE_WILD = "\\w+"
private const val PATTERN_MULTI_WILD = "[\\w\\.]+"
private const val PATTERN_PACKAGE_SEGMENT = "\\."
private val validPatternMatcher =
Regex(
"((\\w+\\*{0,2}|\\*{1,2})\\.)*" +
"((\\w+(([*|_],)*[*|_])>)+)|(\\w+\\*{0,2}|\\*{1,2}))"
)
private val singleWildcardSuffix = Regex(PATTERN_SINGLE_WILD)
private val multiWildcardSuffix = Regex(PATTERN_MULTI_WILD)
}
}