56 lines
1.5 KiB
Plaintext
56 lines
1.5 KiB
Plaintext
local ds = require("DataStructures")
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local Stack, Dictionary, WordInfo, Environment = ds.Stack, ds.Dictionary, ds.WordInfo, ds.Environment
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local helpers = require("CoreHelpers")
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local isNumber, skipWhitespace, parseToken = helpers.isNumber, helpers.skipWhitespace, helpers.parseToken
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local istream = require("InputStream")
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local CoreWords = require("CoreWords")
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local Pointer = ds.Pointer
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local type Interpreters = record
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inner: function(Environment)
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outer: function(Environment)
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end
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function Interpreters.start(env: Environment)
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table.insert(env.dictionaries, CoreWords)
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local interpreterInstructions = {}
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table.insert(interpreterInstructions, Interpreters.outer)
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table.insert(interpreterInstructions, helpers.reset)
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local startPointer = Pointer:new()
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startPointer.referant = interpreterInstructions
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env.instructionPointer = startPointer
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Interpreters.inner(env)
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end
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function Interpreters.outer(env: Environment)
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skipWhitespace(env)
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local token: string | nil = parseToken(env)
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if not token then
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env.running = false
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return
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end
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if isNumber(token) then
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env.activeDataStack:push(tonumber(token))
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else
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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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(wordinfo as WordInfo).func(env)
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goto continue
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end
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end
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print(string.format('%q ?', token))
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::continue::
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end
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end
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function Interpreters.inner(env: Environment)
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while(env.running) do
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env.instructionPointer:deref() as function(Environment)(env)
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env.instructionPointer:inc()
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end
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end
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return Interpreters
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