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Multiplatform Kotlin LuaJ port (LUA interpreter)
/*******************************************************************************
* Copyright (c) 2009-2011 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.compiler
import org.luaj.vm2.Globals
import org.luaj.vm2.LuaClosure
import org.luaj.vm2.LuaFunction
import org.luaj.vm2.LuaString
import org.luaj.vm2.LuaValue
import org.luaj.vm2.Prototype
import org.luaj.vm2.io.*
import org.luaj.vm2.lib.BaseLib
/**
* Compiler for Lua.
*
*
*
* Compiles lua source files into lua bytecode within a [Prototype],
* loads lua binary files directly into a [Prototype],
* and optionaly instantiates a [LuaClosure] around the result
* using a user-supplied environment.
*
*
*
* Implements the [org.luaj.vm2.Globals.Compiler] interface for loading
* initialized chunks, which is an interface common to
* lua bytecode compiling and java bytecode compiling.
*
*
*
* The [LuaC] compiler is installed by default by both the
* [org.luaj.vm2.lib.jse.JsePlatform] and [org.luaj.vm2.lib.jme.JmePlatform] classes,
* so in the following example, the default [LuaC] compiler
* will be used:
* `Globals globals = JsePlatform.standardGlobals();
* globals.load(new StringReader("print 'hello'"), "main.lua" ).call();
` *
*
* To load the LuaC compiler manually, use the install method:
* `LuaC.install(globals);
` *
*
* @see .install
* @see Globals.compiler
*
* @see Globals.loader
*
* @see org.luaj.vm2.luajc.LuaJC
*
* @see org.luaj.vm2.lib.jse.JsePlatform
*
* @see org.luaj.vm2.lib.jme.JmePlatform
*
* @see BaseLib
*
* @see LuaValue
*
* @see Prototype
*/
class LuaC protected constructor() : Constants(), Globals.Compiler, Globals.Loader {
/** Compile lua source into a Prototype.
* @param stream InputStream representing the text source conforming to lua source syntax.
* @param chunkname String name of the chunk to use.
* @return Prototype representing the lua chunk for this source.
* @com.soywiz.luak.compat.java.Throws IOException
*/
override fun compile(stream: LuaBinInput, chunkname: String): Prototype {
return CompileState().luaY_parser(stream, chunkname)
}
override fun load(prototype: Prototype, chunkname: String, env: LuaValue): LuaFunction {
return LuaClosure(prototype, env)
}
//Deprecated(" Use Globals.load(InputString, String, String) instead, \n\t or LuaC.compile(InputStream, String) and construct LuaClosure directly.", ReplaceWith("LuaClosure(compile(stream, chunkname), globals)", "org.luaj.vm2.LuaClosure"))
//fun load(stream: LuaBinInput, chunkname: String, globals: Globals): LuaValue = LuaClosure(compile(stream, chunkname), globals)
class CompileState {
@kotlin.jvm.JvmField
var nCcalls = 0
private val strings = HashMap()
/** Parse the input */
fun luaY_parser(z: LuaBinInput, name: String): Prototype {
val lexstate = LexState(this, z)
val funcstate = FuncState()
// lexstate.buff = buff;
lexstate.fs = funcstate
lexstate.setinput(this, z.read(), z, LuaValue.valueOf(name) as LuaString)
/* main func. is always vararg */
funcstate.f = Prototype()
funcstate.f!!.source = LuaValue.valueOf(name) as LuaString
lexstate.mainfunc(funcstate)
Constants._assert(funcstate.prev == null)
/* all scopes should be correctly finished */
Constants._assert(lexstate.dyd == null || lexstate.dyd.n_actvar == 0 && lexstate.dyd.n_gt == 0 && lexstate.dyd.n_label == 0)
return funcstate.f!!
}
// look up and keep at most one copy of each string
fun newTString(s: String): LuaString {
return cachedLuaString(LuaString.valueOf(s))
}
// look up and keep at most one copy of each string
fun newTString(s: LuaString): LuaString {
return cachedLuaString(s)
}
fun cachedLuaString(s: LuaString): LuaString {
val c = strings.get(s) as? LuaString?
if (c != null)
return c
strings.put(s, s)
return s
}
fun pushfstring(string: String): String {
return string
}
}
companion object {
/** A sharable instance of the LuaC compiler. */
@kotlin.jvm.JvmField
val instance = LuaC()
/** Install the compiler so that LoadState will first
* try to use it when handed bytes that are
* not already a compiled lua chunk.
* @param globals the Globals into which this is to be installed.
*/
fun install(globals: Globals) {
globals.compiler = instance
globals.loader = instance
}
}
}