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• modularlanguages_sjs0.6_2.13
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• ParenthesisInExpressionDelta.scala

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miksilo.modularLanguages.deltas.expression.ParenthesisInExpressionDelta.scala Maven / Gradle / Ivy

package miksilo.modularLanguages.deltas.expression

import miksilo.modularLanguages.core.deltas.grammars.LanguageGrammars
import miksilo.modularLanguages.core.deltas.{Contract, DeltaWithGrammar}
import miksilo.languageServer.core.language.Language

object ParenthesisInExpressionDelta extends DeltaWithGrammar {

  override def dependencies: Set[Contract] = Set(ExpressionDelta)

  override def transformGrammars(grammars: LanguageGrammars, state: Language): Unit = {
    import grammars._
    val core = find(ExpressionDelta.LastPrecedenceGrammar)
    val expression = find(ExpressionDelta.FirstPrecedenceGrammar)
    val parseParenthesis = ("(" ~> value("(" )) ~> expression ~< ")" //TODO: the produce("(") here is a hack to make sure no () show up when printing. Nicer option would be to have a BiGrammar that specifies parsing/printing behavior.
    core.addAlternative(parseParenthesis)
  }

  override def description: String = "Allows wrapping an expression in parenthesis to control operator precedence."
}