#! /usr/bin/env python
#
# Copyright (c) 2008, Nicolas Rougier
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the University of California, Berkeley nor the
# names of its contributors may be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE AUTHOR AND CONTRIBUTORS BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import os
import sys
import re
import rlcompleter
import traceback
import tempfile
if not hasattr(sys, 'ps1'): sys.ps1 = '>>> '
if not hasattr(sys, 'ps2'): sys.ps2 = '... '
class Shell:
""" """
def __init__(self, ns_globals={}, ns_locals={}):
""" """
self.completer = rlcompleter.Completer (ns_globals)
self.command = ''
self.globals = ns_globals
self.locals = ns_locals
self.complete_sep = re.compile('[\s\{\}\[\]\(\)]')
self.prompt = sys.ps1
def namespace(self):
return self.globals
def is_balanced (self, line):
""" Checks line balance for brace, bracket, parenthese and string quote
This helper function checks for the balance of brace, bracket,
parenthese and string quote. Any unbalanced line means to wait until
some other lines are fed to the console.
"""
s = line
s = filter(lambda x: x in '()[]{}"\'', s)
s = s.replace ("'''", "'")
s = s.replace ('"""', '"')
instring = False
brackets = {'(':')', '[':']', '{':'}', '"':'"', '\'':'\''}
stack = []
while len(s):
if not instring:
if s[0] in ')]}':
if stack and brackets[stack[-1]] == s[0]:
del stack[-1]
else:
return False
elif s[0] in '"\'':
if stack and brackets[stack[-1]] == s[0]:
del stack[-1]
instring = False
else:
stack.append(s[0])
instring = True
else:
stack.append(s[0])
else:
if s[0] in '"\'' and stack and brackets[stack[-1]] == s[0]:
del stack[-1]
instring = False
s = s[1:]
return len(stack) == 0
def complete(self, line):
split_line = self.complete_sep.split(line)
possibilities = []
i = 0
c = self.completer.complete (split_line[-1], i)
while c:
possibilities.append(c)
i = i+1
c = self.completer.complete (split_line[-1], i)
if possibilities:
common_prefix = os.path.commonprefix (possibilities)
completed = line[:-len(split_line[-1])]+common_prefix
else:
completed = line
return completed, possibilities
def eval (self, console):
line = console.last_line()
console.write ('\n')
if line == '':
self.execute (console)
self.command = ''
self.prompt = sys.ps1
console.prompt('prompt')
return
self.command = self.command + line + '\n'
if not self.is_balanced (self.command):
self.prompt = sys.ps2
console.prompt('prompt')
return
line = line.rstrip()
if len(line) > 0:
if line[-1] == ':' or line[-1] == '\\' or line[0] in ' \11':
self.prompt = sys.ps2
console.prompt('prompt')
return
self.execute (console)
self.command = ''
self.prompt = sys.ps1
console.prompt('prompt')
def execute (self, console):
if not self.command:
return
try:
try:
r = eval (self.command, self.globals, self.locals)
if r is not None:
# System output (if any)
while True:
try:
buf = os.read(console.piperead, 256)
except:
break
else:
console.write (buf, 'output')
if len(buf) < 256: break
# Command output
print `r`
except SyntaxError:
exec self.command in self.globals
except:
if hasattr (sys, 'last_type') and sys.last_type == SystemExit:
console.quit()
elif hasattr (sys, 'exc_type') and sys.exc_type == SystemExit:
console.quit()
else:
try:
tb = sys.exc_traceback
if tb:
tb=tb.tb_next
traceback.print_exception (sys.exc_type, sys.exc_value, tb)
except:
sys.stderr, console.stderr = console.stderr, sys.stderr
traceback.print_exc()
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