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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 Interval
//
//import java.io.IOException
//import java.io.InputStream
//import java.io.InputStreamReader
//import java.io.Reader
//import java.nio.charset.Charset
//import java.nio.charset.StandardCharsets
//import java.util.Arrays
//
///** Do not buffer up the entire char stream. It does keep a small buffer
// * for efficiency and also buffers while a mark exists (set by the
// * lookahead prediction in parser). "Unbuffered" here refers to fact
// * that it doesn't buffer all data, not that's it's on demand loading of char.
// *
// * Before 4.7, this class used the default environment encoding to convert
// * bytes to UTF-16, and held the UTF-16 bytes in the buffer as chars.
// *
// * As of 4.7, the class uses UTF-8 by default, and the buffer holds Unicode
// * code points in the buffer as ints.
// */
//class UnbufferedCharStream
///** Useful for subclasses that pull char from other than this.input. */
//constructor(bufferSize: Int = 256) : CharStream {
// /**
// * A moving window buffer of the data being scanned. While there's a marker,
// * we keep adding to buffer. Otherwise, [consume()][.consume] resets so
// * we start filling at index 0 again.
// */
// protected var data: IntArray
//
// /**
// * The number of characters currently in [data][.data].
// *
// *
// * This is not the buffer capacity, that's `data.length`.
// */
// protected var n: Int = 0
//
// /**
// * 0..n-1 index into [data][.data] of next character.
// *
// *
// * The `LA(1)` character is `data[p]`. If `p == n`, we are
// * out of buffered characters.
// */
// protected var p = 0
//
// /**
// * Count up with [mark()][.mark] and down with
// * [release()][.release]. When we `release()` the last mark,
// * `numMarkers` reaches 0 and we reset the buffer. Copy
// * `data[p]..data[n-1]` to `data[0]..data[(n-1)-p]`.
// */
// protected var numMarkers = 0
//
// /**
// * This is the `LA(-1)` character for the current position.
// */
// protected var lastChar = -1
//
// /**
// * When `numMarkers > 0`, this is the `LA(-1)` character for the
// * first character in [data][.data]. Otherwise, this is unspecified.
// */
// protected var lastCharBufferStart: Int = 0
//
// /**
// * Absolute character index. It's the index of the character about to be
// * read via `LA(1)`. Goes from 0 to the number of characters in the
// * entire stream, although the stream size is unknown before the end is
// * reached.
// */
// protected var currentCharIndex = 0
//
// protected var input: Reader
//
// /** The name or source of this char stream. */
// var name: String? = null
//
// override val sourceName: String
// get() = if (name == null || name!!.isEmpty()) {
// IntStream.UNKNOWN_SOURCE_NAME
// } else name
//
// protected val bufferStartIndex: Int
// get() = currentCharIndex - p
//
// init {
// n = 0
// data = IntArray(bufferSize)
// }
//
// @JvmOverloads constructor(input: InputStream, bufferSize: Int = 256, charset: Charset = StandardCharsets.UTF_8) : this(bufferSize) {
// this.input = InputStreamReader(input, charset)
// fill(1) // prime
// }
//
// @JvmOverloads constructor(input: Reader, bufferSize: Int = 256) : this(bufferSize) {
// this.input = input
// fill(1) // prime
// }
//
// override fun consume() {
// if (LA(1) == IntStream.EOF) {
// throw IllegalStateException("cannot consume EOF")
// }
//
// // buf always has at least data[p==0] in this method due to ctor
// lastChar = data[p] // track last char for LA(-1)
//
// if (p == n - 1 && numMarkers == 0) {
// n = 0
// p = -1 // p++ will leave this at 0
// lastCharBufferStart = lastChar
// }
//
// p++
// currentCharIndex++
// sync(1)
// }
//
// /**
// * Make sure we have 'need' elements from current position [p][.p].
// * Last valid `p` index is `data.length-1`. `p+need-1` is
// * the char index 'need' elements ahead. If we need 1 element,
// * `(p+1-1)==p` must be less than `data.length`.
// */
// protected fun sync(want: Int) {
// val need = p + want - 1 - n + 1 // how many more elements we need?
// if (need > 0) {
// fill(need)
// }
// }
//
// /**
// * Add `n` characters to the buffer. Returns the number of characters
// * actually added to the buffer. If the return value is less than `n`,
// * then EOF was reached before `n` characters could be added.
// */
// protected fun fill(n: Int): Int {
// for (i in 0 until n) {
// if (this.n > 0 && data[this.n - 1] == IntStream.EOF) {
// return i
// }
//
// try {
// val c = nextChar()
// if (c > Character.MAX_VALUE.toInt() || c == IntStream.EOF) {
// add(c)
// } else {
// val ch = c.toChar()
// if (Character.isLowSurrogate(ch)) {
// throw RuntimeException("Invalid UTF-16 (low surrogate with no preceding high surrogate)")
// } else if (Character.isHighSurrogate(ch)) {
// val lowSurrogate = nextChar()
// if (lowSurrogate > Character.MAX_VALUE.toInt()) {
// throw RuntimeException("Invalid UTF-16 (high surrogate followed by code point > U+FFFF")
// } else if (lowSurrogate == IntStream.EOF) {
// throw RuntimeException("Invalid UTF-16 (dangling high surrogate at end of file)")
// } else {
// val lowSurrogateChar = lowSurrogate.toChar()
// if (Character.isLowSurrogate(lowSurrogateChar)) {
// add(Character.toCodePoint(ch, lowSurrogateChar))
// } else {
// throw RuntimeException("Invalid UTF-16 (dangling high surrogate")
// }
// }
// } else {
// add(c)
// }
// }
// } catch (ioe: IOException) {
// throw RuntimeException(ioe)
// }
//
// }
//
// return n
// }
//
// /**
// * Override to provide different source of characters than
// * [input][.input].
// */
// @Throws(IOException::class)
// protected fun nextChar(): Int {
// return input.read()
// }
//
// protected fun add(c: Int) {
// if (n >= data.size) {
// data = Arrays.copyOf(data, data.size * 2)
// }
// data[n++] = c
// }
//
// override fun LA(i: Int): Int {
// if (i == -1) return lastChar // special case
// sync(i)
// val index = p + i - 1
// if (index < 0) throw IndexOutOfBoundsException()
// return if (index >= n) IntStream.EOF else data[index]
// }
//
// /**
// * Return a marker that we can release later.
// *
// *
// * The specific marker value used for this class allows for some level of
// * protection against misuse where `seek()` is called on a mark or
// * `release()` is called in the wrong order.
// */
// override fun mark(): Int {
// if (numMarkers == 0) {
// lastCharBufferStart = lastChar
// }
//
// val mark = -numMarkers - 1
// numMarkers++
// return mark
// }
//
// /** Decrement number of markers, resetting buffer if we hit 0.
// * @param marker
// */
// override fun release(marker: Int) {
// val expectedMark = -numMarkers
// if (marker != expectedMark) {
// throw IllegalStateException("release() called with an invalid marker.")
// }
//
// numMarkers--
// if (numMarkers == 0 && p > 0) { // release buffer when we can, but don't do unnecessary work
// // Copy data[p]..data[n-1] to data[0]..data[(n-1)-p], reset ptrs
// // p is last valid char; move nothing if p==n as we have no valid char
// System.arraycopy(data, p, data, 0, n - p) // shift n-p char from p to 0
// n = n - p
// p = 0
// lastCharBufferStart = lastChar
// }
// }
//
// override fun index(): Int {
// return currentCharIndex
// }
//
// /** Seek to absolute character index, which might not be in the current
// * sliding window. Move `p` to `index-bufferStartIndex`.
// */
// override fun seek(index: Int) {
// var index = index
// if (index == currentCharIndex) {
// return
// }
//
// if (index > currentCharIndex) {
// sync(index - currentCharIndex)
// index = Math.min(index, bufferStartIndex + n - 1)
// }
//
// // index == to bufferStartIndex should set p to 0
// val i = index - bufferStartIndex
// if (i < 0) {
// throw IllegalArgumentException("cannot seek to negative index " + index)
// } else if (i >= n) {
// throw UnsupportedOperationException("seek to index outside buffer: " +
// index + " not in " + bufferStartIndex + ".." + (bufferStartIndex + n))
// }
//
// p = i
// currentCharIndex = index
// if (p == 0) {
// lastChar = lastCharBufferStart
// } else {
// lastChar = data[p - 1]
// }
// }
//
// override fun size(): Int {
// throw UnsupportedOperationException("Unbuffered stream cannot know its size")
// }
//
// override fun getText(interval: Interval): String {
// if (interval.a < 0 || interval.b < interval.a - 1) {
// throw IllegalArgumentException("invalid interval")
// }
//
// val bufferStartIndex = bufferStartIndex
// if (n > 0 && data[n - 1] == Character.MAX_VALUE.toInt()) {
// if (interval.a + interval.length() > bufferStartIndex + n) {
// throw IllegalArgumentException("the interval extends past the end of the stream")
// }
// }
//
// if (interval.a < bufferStartIndex || interval.b >= bufferStartIndex + n) {
// throw UnsupportedOperationException("interval " + interval + " outside buffer: " +
// bufferStartIndex + ".." + (bufferStartIndex + n - 1))
// }
// // convert from absolute to local index
// val i = interval.a - bufferStartIndex
// return String(data, i, interval.length())
// }
//}
///** Useful for subclasses that pull char from other than this.input. */
