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      1 class Command:
      2     def __init__(self, args, redirects):
      3         self.args = list(args)
      4         self.redirects = list(redirects)
      5 
      6     def __repr__(self):
      7         return 'Command(%r, %r)' % (self.args, self.redirects)
      8 
      9     def __eq__(self, other):
     10         if not isinstance(other, Command):
     11             return False
     12 
     13         return ((self.args, self.redirects) ==
     14                 (other.args, other.redirects))
     15 
     16     def toShell(self, file):
     17         for arg in self.args:
     18             if "'" not in arg:
     19                 quoted = "'%s'" % arg
     20             elif '"' not in arg and '$' not in arg:
     21                 quoted = '"%s"' % arg
     22             else:
     23                 raise NotImplementedError('Unable to quote %r' % arg)
     24             file.write(quoted)
     25 
     26             # For debugging / validation.
     27             import ShUtil
     28             dequoted = list(ShUtil.ShLexer(quoted).lex())
     29             if dequoted != [arg]:
     30                 raise NotImplementedError('Unable to quote %r' % arg)
     31 
     32         for r in self.redirects:
     33             if len(r[0]) == 1:
     34                 file.write("%s '%s'" % (r[0][0], r[1]))
     35             else:
     36                 file.write("%s%s '%s'" % (r[0][1], r[0][0], r[1]))
     37 
     38 class Pipeline:
     39     def __init__(self, commands, negate=False, pipe_err=False):
     40         self.commands = commands
     41         self.negate = negate
     42         self.pipe_err = pipe_err
     43 
     44     def __repr__(self):
     45         return 'Pipeline(%r, %r, %r)' % (self.commands, self.negate,
     46                                          self.pipe_err)
     47 
     48     def __eq__(self, other):
     49         if not isinstance(other, Pipeline):
     50             return False
     51 
     52         return ((self.commands, self.negate, self.pipe_err) ==
     53                 (other.commands, other.negate, self.pipe_err))
     54 
     55     def toShell(self, file, pipefail=False):
     56         if pipefail != self.pipe_err:
     57             raise ValueError('Inconsistent "pipefail" attribute!')
     58         if self.negate:
     59             file.write('! ')
     60         for cmd in self.commands:
     61             cmd.toShell(file)
     62             if cmd is not self.commands[-1]:
     63                 file.write('|\n  ')
     64 
     65 class Seq:
     66     def __init__(self, lhs, op, rhs):
     67         assert op in (';', '&', '||', '&&')
     68         self.op = op
     69         self.lhs = lhs
     70         self.rhs = rhs
     71 
     72     def __repr__(self):
     73         return 'Seq(%r, %r, %r)' % (self.lhs, self.op, self.rhs)
     74 
     75     def __eq__(self, other):
     76         if not isinstance(other, Seq):
     77             return False
     78 
     79         return ((self.lhs, self.op, self.rhs) ==
     80                 (other.lhs, other.op, other.rhs))
     81 
     82     def toShell(self, file, pipefail=False):
     83         self.lhs.toShell(file, pipefail)
     84         file.write(' %s\n' % self.op)
     85         self.rhs.toShell(file, pipefail)
     86