wvlet.airframe.rx.html.RxHtmlMacros.scala Maven / Gradle / Ivy

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Reactive HTML elements for Scala and Scala.js

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/*
 * 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 wvlet.airframe.rx.html

import scala.language.experimental.macros
import scala.reflect.macros.{blackbox => sm}

/**
  */
private[html] object RxHtmlMacros {
  def code(c: sm.Context)(rxElements: c.Tree*): c.Tree = {
    import c.universe.*

    val codes = for (rxElement <- rxElements) yield {
      val pos = rxElement.pos
      val src = pos.source
      val lineBlocks = src.content
        .slice(pos.start, pos.`end`)
        .mkString
        .replaceAll("^\\{\\n", "")
        .replaceAll("\\}$", "")

      val lines = lineBlocks.split("\n")
      val columnOffsetInLine = lines.headOption
        .map { firstLine =>
          firstLine.size - firstLine.stripLeading().size
        }
        .getOrElse(0)

      val trimmedSource = lines
        .map { line =>
          line.replaceFirst(s"^\\s{0,${columnOffsetInLine}}", "")
        }
        .mkString("\n")
      (rxElement, trimmedSource)
    }
    val elems  = codes.map(_._1)
    val source = codes.map(_._2).mkString("\n")
    q"wvlet.airframe.rx.html.RxCode(Seq(..${elems}), ${source})"
  }

}