85 lines
2.9 KiB
Lua
85 lines
2.9 KiB
Lua
--[[
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cratera.lua - pure-Lua Cratera-to-Lua transpiler
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Copyright (C) 2019 Soni L.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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--]]
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-- This code is highly experimental and not very good
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local parser = require "parser"
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local luatokens = require "luatokens"
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local compiler = require "dirtycompiler"
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local LUA_SIGNATURE = string.dump(function() end):sub(1,1)
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local function cratera_load(reader, ...)
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local chunkname, mode, env = ...
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if type(reader) == "string" and reader:sub(1,1) == LUA_SIGNATURE then
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-- bytecode
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return (loadstring or load)(reader, ...)
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end
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local f, s, i = parser.stream(luatokens.defs, reader)
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if type(s[parser.DATA]) == "string" and s[parser.DATA]:sub(1,1) == LUA_SIGNATURE then
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-- bytecode
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local function fn()
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fn = reader
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return s[parser.DATA]
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end
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return (loadstring or load)(function() return fn() end, ...)
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end
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local nl = 1
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local otherstate = {source=chunkname} -- FIXME
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local f, s, i = parser.stream(compiler.defs, function()
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local tokens
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repeat
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local pos, state, transemsg, etoken, estate = f(s, i)
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otherstate.linenumber = state.line
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i = pos
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if not i then return nil end
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if not state then error(transemsg) end
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tokens = {}
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for i,v in ipairs(state) do
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state[i] = nil
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tokens[i] = v
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end
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until #tokens > 0 or not transemsg
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return tokens
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end, otherstate)
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local function fn()
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function fn()
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local tokens
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repeat
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local pos, state, transemsg, etoken, estate, est = f(s, i)
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i = pos
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if not i then return nil end
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if not state then error(transemsg .. " " .. tostring(etoken)) end
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tokens = {""}
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for i,v in ipairs(state) do
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state[i] = nil
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tokens[i+1] = v
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end
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until #tokens > 1 or not transemsg
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return table.concat(tokens, " ")
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end
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local ret = fn()
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return string.sub(ret, 2)
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end
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return load(function()
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return fn()
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end)
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end
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return {load = cratera_load}
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