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Extensions for interop with KSP (Kotlin Symbol Processing).

There is a newer version: 2.0.0

/*
 * Copyright (C) 2021 Square, 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
 *
 * https://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.squareup.kotlinpoet.ksp

import com.google.devtools.ksp.isLocal
import com.google.devtools.ksp.symbol.KSDeclaration
import com.squareup.kotlinpoet.ClassName
import com.squareup.kotlinpoet.LambdaTypeName
import com.squareup.kotlinpoet.ParameterizedTypeName
import com.squareup.kotlinpoet.ParameterizedTypeName.Companion.parameterizedBy
import com.squareup.kotlinpoet.TypeName

internal fun TypeName.rawType(): ClassName {
  return findRawType() ?: throw IllegalArgumentException("Cannot get raw type from $this")
}

internal fun TypeName.findRawType(): ClassName? {
  return when (this) {
    is ClassName -> this
    is ParameterizedTypeName -> rawType
    is LambdaTypeName -> {
      var count = parameters.size
      if (receiver != null) {
        count++
      }
      val functionSimpleName = if (count >= 23) {
        "FunctionN"
      } else {
        "Function$count"
      }
      ClassName("kotlin.jvm.functions", functionSimpleName)
    }
    else -> null
  }
}

internal fun ClassName.withTypeArguments(arguments: List): TypeName {
  return if (arguments.isEmpty()) {
    this
  } else {
    this.parameterizedBy(arguments)
  }
}

internal fun KSDeclaration.toClassNameInternal(): ClassName {
  require(!isLocal()) {
    "Local/anonymous classes are not supported!"
  }
  val pkgName = packageName.asString()
  val typesString = checkNotNull(qualifiedName).asString().removePrefix("$pkgName.")

  val simpleNames = typesString
    .split(".")
  return ClassName(pkgName, simpleNames)
}