198 lines
4.9 KiB
Plaintext
198 lines
4.9 KiB
Plaintext
local ds = require("DataStructures")
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local Dictionary, Stack, WordInfo, Environment = ds.Dictionary, ds.Stack, ds.WordInfo, ds.Environment
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local Pointer = ds.Pointer
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local InputStream = require("InputStream")
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local CoreHelpers = {}
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function CoreHelpers.defineWord(dict: Dictionary, str: string, func: function(Environment, ...: any): any..., imm: boolean)
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local info = WordInfo:new(func, imm)
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dict:define(str, info)
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end
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function CoreHelpers.standardInputRefill(): string
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local input = io.read().."\n"
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return input
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end
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function CoreHelpers._oneReadRefill(str: string): function(): string
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local alreadyRead: boolean = false
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return function(): string
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if not alreadyRead then
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alreadyRead = true
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return str
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else
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return ""
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end
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end
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end
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function CoreHelpers._fileRefill(fname: string): function(): string
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local f = assert(io.open(fname, "r"))
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return function(): string
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local chunk = f:read(2^3)
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if not chunk then chunk = "" end
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return chunk
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end
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end
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function CoreHelpers.fileStream(fname: string): InputStream
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local istream = InputStream:new(CoreHelpers._fileRefill(fname))
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return istream
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end
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function CoreHelpers.oneReadInputStream(str: string): InputStream
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local iStream = InputStream:new(CoreHelpers._oneReadRefill(str))
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return iStream
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end
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function CoreHelpers.areNumbers(a: any, b: any): boolean
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return a is number and b is number
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end
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function CoreHelpers.getActiveDataStack(state: Environment): Stack
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return state.activeDataStack
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end
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function CoreHelpers.isNumber(token: string): boolean
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if tonumber(token) ~= nil then
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return true
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else
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return false
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end
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end
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function CoreHelpers.isWhitespace(chr: string): boolean
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return (chr == " " or
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chr == "\t" or
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chr == "\r" or
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chr == "\n" or
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chr == "\v" or
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chr == "\f")
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end
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function CoreHelpers.skipWhitespace(state: Environment)
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local chr = state.activeInputStream:curr()
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while (CoreHelpers.isWhitespace(chr)) do
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state.activeInputStream:next()
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chr = state.activeInputStream:curr()
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end
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end
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function CoreHelpers.popTwoOperands(state: Environment): any, any
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local stack = CoreHelpers.getActiveDataStack(state)
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local b: any = stack:pop()
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local a: any = stack:pop()
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return a, b
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end
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function CoreHelpers.parseToken(state: Environment): string | nil
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local token: string | nil = ""
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local chr: string | nil = ""
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if not state.activeInputStream:curr() then return nil end
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while(not CoreHelpers.isWhitespace(chr) and chr ~= nil) do
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token = token..(chr as string)
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chr = state.activeInputStream:next()
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end
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return token
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end
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function CoreHelpers.reset(env: Environment)
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env.instructionPointer.index = 0 -- will get incremented after this instruction
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end
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function CoreHelpers.ret(env: Environment)
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local retAddr = env.returnStack:pop() as Pointer
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env.instructionPointer = retAddr
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end
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function CoreHelpers.makeCall(body: {function(Environment)}): function(Environment)
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return function(e: Environment)
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e.returnStack:push(e.instructionPointer)
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e.instructionPointer = Pointer:new(body, 0)
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end
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end
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function CoreHelpers.compile(env: Environment)
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local stack = env.activeDataStack
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local f = stack:pop() as function(Environment)
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table.insert(env.currentDefinition, f)
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end
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function CoreHelpers.literal(env: Environment)
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local stack = env.activeDataStack
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local val = stack:pop()
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local f = function(e: Environment)
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local s = e.activeDataStack
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s:push(val)
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end
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table.insert(env.currentDefinition, f)
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end
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function CoreHelpers.noop(_: Environment)
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return
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end
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function CoreHelpers.postpone(e: Environment)
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CoreHelpers.noop(e)
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end
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function CoreHelpers.execute(env: Environment)
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local stack = CoreHelpers.getActiveDataStack(env)
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local func: function(Environment) = stack:pop() as function(Environment)
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func(env)
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end
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function CoreHelpers.recNumber(env: Environment)
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local dataStack = CoreHelpers.getActiveDataStack(env)
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local token = dataStack:pop() as string
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if CoreHelpers.isNumber(token) then
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-- number
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dataStack:push(tonumber(token))
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-- interpret
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dataStack:push(CoreHelpers.noop)
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-- compile
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dataStack:push(CoreHelpers.literal)
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-- immediate
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dataStack:push(CoreHelpers.literal)
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-- return success
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dataStack:push(true)
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return
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end
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dataStack:push(token)
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dataStack:push(false)
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end
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function CoreHelpers.recWord(env: Environment)
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local dataStack = CoreHelpers.getActiveDataStack(env)
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local token = dataStack:pop() as string
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for _, dictionary in ipairs(env.dictionaries) do
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local wordinfo = dictionary:lookup(token)
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if wordinfo then
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-- XT
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dataStack:push((wordinfo as WordInfo).func)
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-- interpret
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dataStack:push(CoreHelpers.execute)
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-- compile
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if (wordinfo as WordInfo).immediate then
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dataStack:push(CoreHelpers.execute)
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else
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dataStack:push(CoreHelpers.compile)
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end
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-- immediate
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dataStack:push(CoreHelpers.postpone)
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-- return success
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dataStack:push(true)
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return
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end
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end
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dataStack:push(token)
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dataStack:push(false)
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end
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function CoreHelpers.ack(e: Environment)
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io.write("ok\n")
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end
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return CoreHelpers
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