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mal/impls/lua/step1_read_print.lua
Joel Martin 8a19f60386 Move implementations into impls/ dir
- Reorder README to have implementation list after "learning tool"
  bullet.

- This also moves tests/ and libs/ into impls. It would be preferrable
  to have these directories at the top level.  However, this causes
  difficulties with the wasm implementations which need pre-open
  directories and have trouble with paths starting with "../../". So
  in lieu of that, symlink those directories to the top-level.

- Move the run_argv_test.sh script into the tests directory for
  general hygiene.
2020-02-10 23:50:16 -06:00

48 lines
900 B
Lua
Executable File

#!/usr/bin/env lua
local readline = require('readline')
local utils = require('utils')
local types = require('types')
local reader = require('reader')
local printer = require('printer')
-- read
function READ(str)
return reader.read_str(str)
end
-- eval
function EVAL(ast, env)
return ast
end
-- print
function PRINT(exp)
return printer._pr_str(exp, true)
end
-- repl
function rep(str)
return PRINT(EVAL(READ(str),""))
end
if #arg > 0 and arg[1] == "--raw" then
readline.raw = true
end
while true do
line = readline.readline("user> ")
if not line then break end
xpcall(function()
print(rep(line))
end, function(exc)
if exc then
if types._malexception_Q(exc) then
exc = printer._pr_str(exc.val, true)
end
print("Error: " .. exc)
print(debug.traceback())
end
end)
end