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/*******************************************************************************
* Copyright (c) 2009 Luaj.org. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.luaj.vm2
import org.luaj.vm2.internal.*
import kotlin.jvm.*
/**
* String buffer for use in string library methods, optimized for production
* of StrValue instances.
*
*
* The buffer can begin initially as a wrapped [LuaValue]
* and only when concatenation actually occurs are the bytes first copied.
*
*
* To convert back to a [LuaValue] again,
* the function [Buffer.value] is used.
* @see LuaValue
*
* @see LuaValue.buffer
* @see LuaString
*/
class Buffer {
/** Bytes in this buffer */
private var bytes: ByteArray
/** Length of this buffer */
private var length: Int = 0
/** Offset into the byte array */
private var offset: Int = 0
/** Value of this buffer, when not represented in bytes */
private var value: LuaValue? = null
/**
* Create buffer with specified initial capacity
* @param initialCapacity the initial capacity
*/
@JvmOverloads
constructor(initialCapacity: Int = DEFAULT_CAPACITY) {
bytes = ByteArray(initialCapacity)
length = 0
offset = 0
value = null
}
/**
* Create buffer with specified initial value
* @param value the initial value
*/
constructor(value: LuaValue) {
bytes = NOBYTES
offset = 0
length = offset
this.value = value
}
/**
* Get buffer contents as a [LuaValue]
* @return value as a [LuaValue], converting as necessary
*/
fun value(): LuaValue {
return if (value != null) value!! else this.tostring()
}
/**
* Set buffer contents as a [LuaValue]
* @param value value to set
*/
fun setvalue(value: LuaValue): Buffer {
bytes = NOBYTES
length = 0
offset = length
this.value = value
return this
}
/**
* Convert the buffer to a [LuaString]
* @return the value as a [LuaString]
*/
fun tostring(): LuaString {
realloc(length, 0)
return LuaString.valueOf(bytes, offset, length)
}
/**
* Convert the buffer to a Java String
* @return the value as a Java String
*/
fun tojstring(): String {
return value().tojstring()
}
/**
* Convert the buffer to a Java String
* @return the value as a Java String
*/
override fun toString(): String {
return tojstring()
}
/**
* Append a single byte to the buffer.
* @return `this` to allow call chaining
*/
fun append(b: Byte): Buffer {
makeroom(0, 1)
bytes!![offset + length++] = b
return this
}
/**
* Append a [LuaValue] to the buffer.
* @return `this` to allow call chaining
*/
fun append(`val`: LuaValue): Buffer {
append(`val`.strvalue()!!)
return this
}
/**
* Append a [LuaString] to the buffer.
* @return `this` to allow call chaining
*/
fun append(str: LuaString): Buffer {
val n = str.m_length
makeroom(0, n)
str.copyInto(0, bytes, offset + length, n)
length += n
return this
}
/**
* Append a Java String to the buffer.
* The Java string will be converted to bytes using the UTF8 encoding.
* @return `this` to allow call chaining
* @see LuaString.encodeToUtf8
*/
@UseExperimental(ExperimentalStdlibApi::class)
fun append(str: String): Buffer {
val c = str.toCharArray()
val n = LuaString.lengthAsUtf8(c)
makeroom(0, n)
LuaString.encodeToUtf8(c, c.size, bytes, offset + length)
length += n
return this
}
/** Concatenate this buffer onto a [LuaValue]
* @param lhs the left-hand-side value onto which we are concatenating `this`
* @return [Buffer] for use in call chaining.
*/
fun concatTo(lhs: LuaValue): Buffer {
return setvalue(lhs.concat(value()))
}
/** Concatenate this buffer onto a [LuaString]
* @param lhs the left-hand-side value onto which we are concatenating `this`
* @return [Buffer] for use in call chaining.
*/
fun concatTo(lhs: LuaString): Buffer {
return if (value != null && !value!!.isstring()) setvalue(lhs.concat(value!!)) else prepend(lhs)
}
/** Concatenate this buffer onto a [LuaNumber]
*
*
* The [LuaNumber] will be converted to a string before concatenating.
* @param lhs the left-hand-side value onto which we are concatenating `this`
* @return [Buffer] for use in call chaining.
*/
fun concatTo(lhs: LuaNumber): Buffer {
return if (value != null && !value!!.isstring()) setvalue(lhs.concat(value!!)) else prepend(lhs.strvalue()!!)
}
/** Concatenate bytes from a [LuaString] onto the front of this buffer
* @param s the left-hand-side value which we will concatenate onto the front of `this`
* @return [Buffer] for use in call chaining.
*/
fun prepend(s: LuaString): Buffer {
val n = s.m_length
makeroom(n, 0)
arraycopy(s.m_bytes, s.m_offset, bytes!!, offset - n, n)
offset -= n
length += n
value = null
return this
}
/** Ensure there is enough room before and after the bytes.
* @param nbefore number of unused bytes which must precede the data after this completes
* @param nafter number of unused bytes which must follow the data after this completes
*/
fun makeroom(nbefore: Int, nafter: Int) {
if (value != null) {
val s = value!!.strvalue()
value = null
length = s!!.m_length
offset = nbefore
bytes = ByteArray(nbefore + length + nafter)
arraycopy(s.m_bytes, s.m_offset, bytes!!, offset, length)
} else if (offset + length + nafter > bytes!!.size || offset < nbefore) {
val n = nbefore + length + nafter
val m = if (n < 32) 32 else if (n < length * 2) length * 2 else n
realloc(m, if (nbefore == 0) 0 else m - length - nafter)
}
}
/** Reallocate the internal storage for the buffer
* @param newSize the size of the buffer to use
* @param newOffset the offset to use
*/
private fun realloc(newSize: Int, newOffset: Int) {
if (newSize != bytes!!.size) {
val newBytes = ByteArray(newSize)
arraycopy(bytes!!, offset, newBytes, newOffset, length)
bytes = newBytes
offset = newOffset
}
}
companion object {
/** Default capacity for a buffer: 64 */
private val DEFAULT_CAPACITY = 64
/** Shared static array with no bytes */
private val NOBYTES = byteArrayOf()
}
}
/**
* Create buffer with default capacity
* @see .DEFAULT_CAPACITY
*/
