Move helper functions for the CoreWords dictionary into its own module.

CoreHelpers.tl

@@ -0,0 +1,56 @@
+local ds = require("DataStructures")
+local Dictionary, Stack, WordInfo, State = ds.Dictionary, ds.Stack, ds.WordInfo, ds.State
+
+local CoreHelpers = {}
+
+function CoreHelpers.areNumbers(a: any, b: any): boolean
+	return a is number and b is number
+end
+
+function CoreHelpers.getActiveDataStack(state: State): Stack
+	return state.activeDataStack
+end
+
+function CoreHelpers.isNumber(token: string): boolean
+	if tonumber(token) ~= nil then
+		return true
+	else
+		return false
+	end
+end
+
+function CoreHelpers.isWhitespace(chr: string): boolean
+	return (chr == " " or
+					chr == "\t" or
+					chr == "\r" or
+					chr == "\n" or
+					chr == "\v" or
+					chr == "\f")
+end
+function CoreHelpers.skipWhitespace(state: State)
+	local chr = state.activeInputStream:readCurrentCharacter()
+	while (CoreHelpers.isWhitespace(chr)) do
+		chr = state.activeInputStream:advanceOffset()
+	end
+end
+
+function CoreHelpers.popTwoOperands(state: State): any, any
+	local stack = CoreHelpers.getActiveDataStack(state)
+	local b: any = stack:pop()
+	local a: any = stack:pop()
+	return a, b
+end
+
+
+function CoreHelpers.parseToken(state: State): string
+	local chr = state.activeInputStream:readCurrentCharacter()
+	local token = ""
+	while(not CoreHelpers.isWhitespace(chr)) do
+		token = token..chr
+		chr = state.activeInputStream:advanceOffset()
+	end
+	return token
+end
+
+return CoreHelpers
+

CoreWords.tl

@@ -1,45 +1,14 @@
 local ds = require("DataStructures")
 local Dictionary, Stack, WordInfo, State = ds.Dictionary, ds.Stack, ds.WordInfo, ds.State
-
-
--- helper functions
-local function areNumbers(state: State, a: any, b: any): boolean
-  return a is number and b is number
-end
-
-local function getActiveDataStack(state: State): Stack
-  return state.activeDataStack
-end
-
-local function isNumber(state: State, token: string): boolean
-  if tonumber(token) ~= nil then
-    return true
-  else
-    return false
-  end
-end
-
-local function isWhitespace(state: State, chr: string): boolean
-  return (chr == " " or
-          chr == "\t" or
-          chr == "\r" or
-          chr == "\n" or
-          chr == "\v" or
-          chr == "\f")
-end
-
-local function popTwoOperands(state: State): any, any
-  local stack = getActiveDataStack(state)
-  local b: any = stack:pop()
-  local a: any = stack:pop()
-  return a, b
-end
-
+local helpers = require("CoreHelpers")
+local areNumbers, getActiveDataStack, isNumber, isWhitespace= helpers.areNumbers, helpers.getActiveDataStack, helpers.isNumber, helpers.isWhitespace
+local skipWhitespace, parseToken = helpers.skipWhitespace, helpers.parseToken
+local popTwoOperands = helpers.popTwoOperands
 
 -- Mathematical operations
 local function add(state: State)
   local a, b = popTwoOperands(state)
-  if areNumbers(state, a,b) then
+  if areNumbers(a,b) then
     local c = (a as number) + (b as number)
     getActiveDataStack(state):push(c)
   else
@@ -48,7 +17,7 @@ local function add(state: State)
 end
 local function sub(state: State)
   local a, b = popTwoOperands(state)
-  if areNumbers(state, a, b) then
+  if areNumbers(a, b) then
     local c = (a as number) - (b as number)
     getActiveDataStack(state):push(c)
   else
@@ -57,7 +26,7 @@ local function sub(state: State)
 end
 local function mul(state: State)
   local a, b = popTwoOperands(state)
-  if areNumbers(state, a, b) then
+  if areNumbers(a, b) then
     local c = (a as number) * (b as number)
     getActiveDataStack(state):push(c)
   else
@@ -66,7 +35,7 @@ local function mul(state: State)
 end
 local function div(state: State)
   local a, b = popTwoOperands(state)
-  if areNumbers(state, a, b) then
+  if areNumbers(a, b) then
     local c = (a as number) / (b as number)
     getActiveDataStack(state):push(c)
   else
@@ -80,50 +49,17 @@ local function dot(state: State)
 
 end
 
-local function skipWhitespace(state: State)
-  local chr = state.activeInputStream:readCurrentCharacter()
-  while (isWhitespace(state, chr)) do
-    chr = state.activeInputStream:advanceOffset()
-  end
-end
-
-local function parseToken(state: State): string
-  local chr = state.activeInputStream:readCurrentCharacter()
-  local token = ""
-  while(not isWhitespace(state, chr)) do
-    token = token..chr
-    chr = state.activeInputStream:advanceOffset()
-  end
-  return token
-end
-
-
-
 local CoreWords = Dictionary:new()
 local addInfo = WordInfo:new(add, false)
 local subInfo = WordInfo:new(sub, false)
 local mulInfo = WordInfo:new(mul, false)
 local divInfo = WordInfo:new(div, false)
 local dotInfo = WordInfo:new(dot, false)
-local getActiveDataStackInfo = WordInfo:new(getActiveDataStack, true)
-local areNumbersInfo = WordInfo:new(areNumbers, false)
-local isNumberInfo = WordInfo:new(isNumber, false)
-local isWhitespaceInfo = WordInfo:new(isWhitespace, false)
-local popTwoOperandsInfo = WordInfo:new(popTwoOperands, false)
-local parseTokenInfo = WordInfo:new(parseToken, true)
-local skipWhitespaceInfo = WordInfo:new(skipWhitespace, true)
 CoreWords:define("+", addInfo)
 CoreWords:define("-", subInfo)
 CoreWords:define("*", mulInfo)
 CoreWords:define("/", divInfo)
 CoreWords:define(".", dotInfo)
-CoreWords:define("GetActiveData", getActiveDataStackInfo)
-CoreWords:define("areNumbers", areNumbersInfo)
-CoreWords:define("isNumber", isNumberInfo)
-CoreWords:define("isWhitespace", isWhitespaceInfo)
-CoreWords:define("popTwo", popTwoOperandsInfo)
-CoreWords:define("parseToken", parseTokenInfo)
-CoreWords:define("skipWhitespace", skipWhitespaceInfo)
 return CoreWords
 
 

ForthInterpreter.tl

@@ -2,7 +2,8 @@ local CoreWords = require("CoreWords")
 local ds = require("DataStructures")
 local istream = require("InputStream")
 local Stack, Dictionary, WordInfo, State = ds.Stack, ds.Dictionary, ds.WordInfo, ds.State
-
+local helpers = require("CoreHelpers")
+local isNumber, skipWhitespace, parseToken = helpers.isNumber, helpers.skipWhitespace, helpers.parseToken
 local machineState = State:new()
 
 function standardInputRefill(): string
@@ -16,18 +17,11 @@ machineState.activeInputStream = standardInputStream
 machineState.activeDataStack = Stack:new()
 table.insert(machineState.dictionaries, CoreWords)
 
-local getActiveDataStacks = (CoreWords:lookup("GetActiveData") as WordInfo).func
-local areNumbers = (CoreWords:lookup("areNumbers") as WordInfo).func
-local isNumber = (CoreWords:lookup("isNumber") as WordInfo).func
-local isWhitespace = (CoreWords:lookup("isWhitespace") as WordInfo).func
-local popTwoOperands = (CoreWords:lookup("popTwo") as WordInfo).func
-local skipWhitespace = (CoreWords:lookup("skipWhitespace") as WordInfo).func
-local parseToken = (CoreWords:lookup("parseToken") as WordInfo).func
 
 while(true) do
 	skipWhitespace(machineState)
 	local token: string = parseToken(machineState)
-	if isNumber(machineState, token) then
+	if isNumber(token) then
 		machineState.activeDataStack:push(tonumber(token))
 	else
 		for i, dictionary in ipairs(machineState.dictionaries) do