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