1 files changed, 71 insertions, 0 deletions
diff --git a/cratera.lua b/cratera.lua
new file mode 100644
index 0000000..fabb371
--- /dev/null
+++ b/cratera.lua
@@ -0,0 +1,71 @@
+--[[
+    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 "compiler"
+
+local CRATERA_SEED = nil -- TODO
+
+local function cratera_load(reader)
+    local f, s, i = parser.stream(luatokens.defs, reader)
+    local nl = 1
+    local otherstate = {}
+    local f, s, i = parser.stream(compiler.defs, function()
+        local tokens
+        repeat
+            local pos, state, transemsg, etoken, estate = f(s, i)
+            otherstate.line = 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, CRATERA_SEED = CRATERA_SEED}