org.jetbrains.kotlin.js.parser.OffsetToSourceMapping.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2017 JetBrains s.r.o.
*
* 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 org.jetbrains.kotlin.js.parser
import com.google.gwt.dev.js.rhino.CodePosition
class OffsetToSourceMapping(text: String) {
private val data: IntArray
init {
var i = 0
val lineSeparators = mutableListOf()
lineSeparators += 0
while (i < text.length) {
val c = text[i++]
val isNewLine = when (c) {
'\r' -> {
if (i < text.length && text[i] == '\n') {
++i
}
true
}
'\n' -> true
else -> false
}
if (isNewLine) {
lineSeparators += i
}
}
data = lineSeparators.toIntArray()
}
operator fun get(offset: Int): CodePosition {
val lineNumber = data.binarySearch(offset).let { if (it >= 0) it else -it - 2 }
return CodePosition(lineNumber, offset - data[lineNumber])
}
}