view tests/heredoctest.py @ 25815:e71e5629e006

parser: separate actions for primary expression and prefix operator

This will allow us to define both a primary expression, ":", and a prefix
operator, ":y". The ambiguity will be resolved by the next patch.

Prefix actions in elements table are adjusted as follows:

  original prefix      primary  prefix
  -----------------    -------- -----------------
  ("group", 1, ")") -> n/a      ("group", 1, ")")
  ("negate", 19)    -> n/a      ("negate", 19)
  ("symbol",)       -> "symbol" n/a

import sys

globalvars = {}
lines = sys.stdin.readlines()
while lines:
    l = lines.pop(0)
    if l.startswith('SALT'):
        print(l[:-1])
    elif l.startswith('>>> '):
        snippet = l[4:]
        while lines and lines[0].startswith('... '):
            l = lines.pop(0)
            snippet += l[4:]
        c = compile(snippet, '<heredoc>', 'single')
        try:
            exec(c, globalvars)
        except Exception as inst:
            print(repr(inst))