com.netflix.rewrite.refactor.op.InsertMethodArgument.kt Maven / Gradle / Ivy

/**
 * Copyright 2016 Netflix, 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.
 */
package com.netflix.rewrite.refactor.op

import com.netflix.rewrite.ast.AstTransform
import com.netflix.rewrite.ast.Formatting
import com.netflix.rewrite.ast.Tr
import com.netflix.rewrite.ast.format
import com.netflix.rewrite.refactor.RefactorVisitor

class InsertMethodArgument(val pos: Int,
                           val source: String,
                           override val ruleName: String = "insert-method-argument"): RefactorVisitor() {

    override fun visitMethodInvocation(meth: Tr.MethodInvocation): List> {
        return transform {
            meth.copy(args = meth.args.let {
                val modifiedArgs = it.args.toMutableList()
                modifiedArgs.removeIf { it is Tr.Empty }

                modifiedArgs.add(pos, Tr.UnparsedSource(source,
                        if (pos == 0) {
                            modifiedArgs.firstOrNull()?.formatting ?: Formatting.Empty
                        } else format(" "))
                )

                if(pos == 0 && modifiedArgs.size > 1) {
                    // this argument previously did not occur after a comma, and now does, so let's introduce a bit of space
                    modifiedArgs[1] = modifiedArgs[1].changeFormatting(format(" "))
                }

                it.copy(args = modifiedArgs)
            })
        }
    }
}