commonMain.agl.runtime.structure.RuntimePreferenceRule.kt Maven / Gradle / Ivy

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Dynamic, scan-on-demand, parsing; when a regular expression is just not enough

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/**
 * Copyright (C) 2023 Dr. David H. Akehurst (http://dr.david.h.akehurst.net)
 *
 * 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 net.akehurst.language.agl.runtime.structure

import net.akehurst.language.agl.automaton.LookaheadSetPart

internal class RuntimePreferenceRule(
    val contextRule: RuntimeRule,
    val options: List
) {

    enum class Assoc { NONE, LEFT, RIGHT }

    data class RuntimePreferenceOption(
        val precedence: Int,
        val target: RuntimeRule,
        val option: Int,
        val operators: Set,
        val associativity: Assoc
    )

    fun precedenceFor(to: List, lh: LookaheadSetPart): List {
        val r = options.filter { pr ->
            val rpMatch = to.any { it.rule == pr.target && it.option == pr.option }
            rpMatch && pr.operators.any { lh.fullContent.contains(it) }
        }
        return r
    }
}