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Kotlin multiplatform port of ANTLR

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/*
 * Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
package org.antlr.v4.kotlinruntime

import com.soywiz.korio.lang.Charset
import com.soywiz.korio.lang.UTF8
import org.antlr.v4.kotlinruntime.misc.Utils

/**
 * This is an [ANTLRInputStream] that is loaded from a file all at once
 * when you construct the object.
 */
@Deprecated("as of 4.7 Please use {@link CharStreams} interface.")
class ANTLRFileStream
private constructor(override val sourceName: String, val charset: Charset = UTF8)
    : ANTLRInputStream() {

    companion object {
        suspend fun invoke(fileName: String, charset: Charset = UTF8): ANTLRFileStream {
            val fs = ANTLRFileStream(fileName, charset)
            fs.load()
            return fs
        }
    }

    private suspend fun load() {
        data = Utils.readFile(sourceName, charset)
        this.n = data!!.size
    }
}