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#!/usr/bin/env python3
from neb import lex, parse, interpret, NebPanic, Environment
from neb.std import *
import sys
import readline
class NebCompleter:
def __init__(self, syntax):
self.syntax = syntax
def complete(self, text, state):
results = [x for x in self.syntax if x.startswith(text)] + [None]
return results[state]
def build_std(repl=False):
GLOBALS = Environment()
global_dict = { **BOOLEAN.environment,
**CORE.environment,
**FUNCTOOLS.environment,
**FS.environment,
**LISTS.environment,
**MATH.environment,
**STRINGS.environment,
**SYS.environment,
**TERM.environment,
**TYPES.environment }
if repl:
global_dict = { **global_dict,
**REPL.environment }
GLOBALS.environment = global_dict
return GLOBALS
def debug(prev_lexed, prev_parsed):
if prev_lexed is not None:
acc = " ".join([f"{l}" for l in prev_lexed])
print(f" - LEX: {acc}")
if prev_parsed is not None:
acc = " ".join([f"{p}" for p in prev_parsed])
print(f" - PARSE: {acc}")
def repl():
env = build_std(True)
readline.parse_and_bind("tab: complete")
cmp = NebCompleter(env.environment.keys())
readline.set_completer(cmp.complete)
readline.set_completer_delims(" ()")
print("### neb :)(:")
print("version: < 0")
idx = 1
prev_idx = 0
prev_lexed = None
prev_parsed = None
while True:
inp = input(f"#{idx}> ")
if len(inp.strip()) == 0:
continue
try:
if inp.strip() == "(debug)":
debug(prev_lexed, prev_parsed)
continue
lexed = lex(inp)
prev_lexed = lexed
parsed = parse(lexed)
prev_parsed = parsed
inter = interpret(parsed, env)
print(f"=> {inter}")
prev_idx = idx
idx += 1
except NebPanic as ne:
print(f"panic! {ne}")
except Exception as e:
print(f"exception! {type(e)} {e}")
def run_file(filename):
env = build_std(True)
readline.parse_and_bind("tab: complete")
cmp = NebCompleter(env.environment.keys())
readline.set_completer(cmp.complete)
readline.set_completer_delims(" ()")
with open(filename, "r") as fil:
data = fil.read()
try:
lexed = lex(data)
parsed = parse(lexed)
ev = interpret(parsed, env)
except NebPanic as ne:
print(f"panic! {ne}")
except Exception as e:
print(f"exception! {type(e)} {e}")
if __name__ == "__main__":
if len(sys.argv) == 1:
repl()
elif len(sys.argv) >= 2:
run_file(sys.argv[1])
else:
print("usage: neb [<file>]")
sys.exit(1)
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