Set up a "build system"

1 files changed, 67 insertions, 0 deletions

diff --git a/src/bin/printtokens.lua b/src/bin/printtokens.lua
new file mode 100644
index 0000000..49827da
--- /dev/null
+++ b/src/bin/printtokens.lua
@@ -0,0 +1,67 @@
+--[[
+    This file is part of Cratera Compiler
+    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 isn't supposed to be installed or anything it's just a basic CLI to
+-- print a lua or cratera file as a token stream.
+
+local parser = require "cratera.parser"
+
+-- CLI argument rules
+local defs = parser.selfify({})
+defs['-'] = function(state, token)
+    if state.filename then
+        error("Must specify only one filename")
+    end
+    state.filename = true
+    state.file = io.stdin
+    return "self"
+end
+defs[parser.FALLBACK] = function(state, token)
+    if state.filename then
+        error("Must specify only one filename")
+    end
+    state.filename = token
+    state.file, state.err = io.open(state.filename, "r")
+    return "self"
+end
+defs[parser.EOZ] = function(state, token)
+    if not state.file then
+        error((state.filename and (state.err or "") or "No file specified") )
+    end
+    return {}
+end
+defs[-1] = function(state, token, rule)
+    if token ~= parser.EOZ and token:sub(1,1) == "-" and not rule then
+        error("Unknown option: " .. token)
+    end
+end
+defs['--'] = parser.selfify({[parser.FALLBACK] = defs[parser.FALLBACK], [parser.EOZ] = defs[parser.EOZ]})
+
+local state = parser.parse(defs, arg)
+local luatokens = require "cratera.luatokens"
+local file = state.file
+local tokens = luatokens.defs
+local state, err, etoken, estate = parser.parse(tokens, function() return file:read(8192) end)
+if state then
+    for i,v in ipairs(state) do
+        v = luatokens.reverse_keywords[v] or luatokens.reverse_tokens[v] or v
+        print(i, v) -- TODO formatting
+    end
+else
+    print("Parse error")
+end