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mal/impls/coffee/step1_read_print.coffee
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

30 lines
717 B
CoffeeScript

readline = require "./node_readline.coffee"
reader = require "./reader.coffee"
printer = require "./printer.coffee"
# read
READ = (str) -> reader.read_str str
# eval
EVAL = (ast, env) -> ast
# print
PRINT = (exp) -> printer._pr_str exp, true
# repl
rep = (str) -> PRINT(EVAL(READ(str), {}))
# repl loop
while (line = readline.readline("user> ")) != null
continue if line == ""
try
console.log rep line
catch exc
continue if exc instanceof reader.BlankException
if exc.stack? and exc.stack.length > 2000
console.log exc.stack.slice(0,1000) + "\n ..." + exc.stack.slice(-1000)
else if exc.stack? then console.log exc.stack
else console.log exc
# vim: ts=2:sw=2