319 lines
11 KiB
Python
319 lines
11 KiB
Python
import ast
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import codegen
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import logging
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import os.path
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import bb.utils, bb.data
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from itertools import chain
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from pysh import pyshyacc, pyshlex, sherrors
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from bb.cache import MultiProcessCache
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logger = logging.getLogger('BitBake.CodeParser')
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try:
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import cPickle as pickle
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except ImportError:
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import pickle
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logger.info('Importing cPickle failed. Falling back to a very slow implementation.')
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def check_indent(codestr):
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"""If the code is indented, add a top level piece of code to 'remove' the indentation"""
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i = 0
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while codestr[i] in ["\n", "\t", " "]:
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i = i + 1
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if i == 0:
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return codestr
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if codestr[i-1] == "\t" or codestr[i-1] == " ":
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return "if 1:\n" + codestr
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return codestr
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class CodeParserCache(MultiProcessCache):
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cache_file_name = "bb_codeparser.dat"
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CACHE_VERSION = 2
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def __init__(self):
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MultiProcessCache.__init__(self)
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self.pythoncache = self.cachedata[0]
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self.shellcache = self.cachedata[1]
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self.pythoncacheextras = self.cachedata_extras[0]
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self.shellcacheextras = self.cachedata_extras[1]
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def init_cache(self, d):
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MultiProcessCache.init_cache(self, d)
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# cachedata gets re-assigned in the parent
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self.pythoncache = self.cachedata[0]
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self.shellcache = self.cachedata[1]
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def compress_keys(self, data):
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# When the dicts are originally created, python calls intern() on the set keys
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# which significantly improves memory usage. Sadly the pickle/unpickle process
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# doesn't call intern() on the keys and results in the same strings being duplicated
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# in memory. This also means pickle will save the same string multiple times in
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# the cache file. By interning the data here, the cache file shrinks dramatically
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# meaning faster load times and the reloaded cache files also consume much less
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# memory. This is worth any performance hit from this loops and the use of the
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# intern() data storage.
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# Python 3.x may behave better in this area
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for h in data[0]:
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data[0][h]["refs"] = self.internSet(data[0][h]["refs"])
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data[0][h]["execs"] = self.internSet(data[0][h]["execs"])
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for h in data[1]:
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data[1][h]["execs"] = self.internSet(data[1][h]["execs"])
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return
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def create_cachedata(self):
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data = [{}, {}]
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return data
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codeparsercache = CodeParserCache()
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def parser_cache_init(d):
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codeparsercache.init_cache(d)
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def parser_cache_save(d):
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codeparsercache.save_extras(d)
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def parser_cache_savemerge(d):
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codeparsercache.save_merge(d)
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Logger = logging.getLoggerClass()
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class BufferedLogger(Logger):
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def __init__(self, name, level=0, target=None):
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Logger.__init__(self, name)
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self.setLevel(level)
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self.buffer = []
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self.target = target
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def handle(self, record):
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self.buffer.append(record)
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def flush(self):
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for record in self.buffer:
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self.target.handle(record)
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self.buffer = []
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class PythonParser():
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getvars = ("d.getVar", "bb.data.getVar", "data.getVar")
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execfuncs = ("bb.build.exec_func", "bb.build.exec_task")
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def warn(self, func, arg):
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"""Warn about calls of bitbake APIs which pass a non-literal
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argument for the variable name, as we're not able to track such
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a reference.
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"""
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try:
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funcstr = codegen.to_source(func)
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argstr = codegen.to_source(arg)
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except TypeError:
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self.log.debug(2, 'Failed to convert function and argument to source form')
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else:
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self.log.debug(1, self.unhandled_message % (funcstr, argstr))
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def visit_Call(self, node):
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name = self.called_node_name(node.func)
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if name in self.getvars:
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if isinstance(node.args[0], ast.Str):
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self.var_references.add(node.args[0].s)
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else:
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self.warn(node.func, node.args[0])
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elif name in self.execfuncs:
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if isinstance(node.args[0], ast.Str):
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self.var_execs.add(node.args[0].s)
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else:
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self.warn(node.func, node.args[0])
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elif name and isinstance(node.func, (ast.Name, ast.Attribute)):
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self.execs.add(name)
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def called_node_name(self, node):
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"""Given a called node, return its original string form"""
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components = []
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while node:
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if isinstance(node, ast.Attribute):
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components.append(node.attr)
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node = node.value
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elif isinstance(node, ast.Name):
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components.append(node.id)
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return '.'.join(reversed(components))
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else:
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break
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def __init__(self, name, log):
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self.var_references = set()
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self.var_execs = set()
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self.execs = set()
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self.references = set()
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self.log = BufferedLogger('BitBake.Data.%s' % name, logging.DEBUG, log)
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self.unhandled_message = "in call of %s, argument '%s' is not a string literal"
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self.unhandled_message = "while parsing %s, %s" % (name, self.unhandled_message)
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def parse_python(self, node):
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h = hash(str(node))
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if h in codeparsercache.pythoncache:
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self.references = codeparsercache.pythoncache[h]["refs"]
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self.execs = codeparsercache.pythoncache[h]["execs"]
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return
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if h in codeparsercache.pythoncacheextras:
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self.references = codeparsercache.pythoncacheextras[h]["refs"]
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self.execs = codeparsercache.pythoncacheextras[h]["execs"]
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return
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code = compile(check_indent(str(node)), "<string>", "exec",
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ast.PyCF_ONLY_AST)
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for n in ast.walk(code):
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if n.__class__.__name__ == "Call":
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self.visit_Call(n)
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self.references.update(self.var_references)
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self.references.update(self.var_execs)
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codeparsercache.pythoncacheextras[h] = {}
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codeparsercache.pythoncacheextras[h]["refs"] = self.references
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codeparsercache.pythoncacheextras[h]["execs"] = self.execs
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class ShellParser():
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def __init__(self, name, log):
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self.funcdefs = set()
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self.allexecs = set()
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self.execs = set()
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self.log = BufferedLogger('BitBake.Data.%s' % name, logging.DEBUG, log)
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self.unhandled_template = "unable to handle non-literal command '%s'"
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self.unhandled_template = "while parsing %s, %s" % (name, self.unhandled_template)
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def parse_shell(self, value):
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"""Parse the supplied shell code in a string, returning the external
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commands it executes.
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"""
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h = hash(str(value))
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if h in codeparsercache.shellcache:
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self.execs = codeparsercache.shellcache[h]["execs"]
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return self.execs
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if h in codeparsercache.shellcacheextras:
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self.execs = codeparsercache.shellcacheextras[h]["execs"]
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return self.execs
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try:
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tokens, _ = pyshyacc.parse(value, eof=True, debug=False)
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except pyshlex.NeedMore:
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raise sherrors.ShellSyntaxError("Unexpected EOF")
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for token in tokens:
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self.process_tokens(token)
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self.execs = set(cmd for cmd in self.allexecs if cmd not in self.funcdefs)
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codeparsercache.shellcacheextras[h] = {}
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codeparsercache.shellcacheextras[h]["execs"] = self.execs
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return self.execs
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def process_tokens(self, tokens):
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"""Process a supplied portion of the syntax tree as returned by
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pyshyacc.parse.
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"""
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def function_definition(value):
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self.funcdefs.add(value.name)
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return [value.body], None
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def case_clause(value):
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# Element 0 of each item in the case is the list of patterns, and
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# Element 1 of each item in the case is the list of commands to be
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# executed when that pattern matches.
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words = chain(*[item[0] for item in value.items])
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cmds = chain(*[item[1] for item in value.items])
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return cmds, words
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def if_clause(value):
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main = chain(value.cond, value.if_cmds)
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rest = value.else_cmds
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if isinstance(rest, tuple) and rest[0] == "elif":
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return chain(main, if_clause(rest[1]))
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else:
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return chain(main, rest)
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def simple_command(value):
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return None, chain(value.words, (assign[1] for assign in value.assigns))
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token_handlers = {
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"and_or": lambda x: ((x.left, x.right), None),
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"async": lambda x: ([x], None),
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"brace_group": lambda x: (x.cmds, None),
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"for_clause": lambda x: (x.cmds, x.items),
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"function_definition": function_definition,
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"if_clause": lambda x: (if_clause(x), None),
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"pipeline": lambda x: (x.commands, None),
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"redirect_list": lambda x: ([x.cmd], None),
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"subshell": lambda x: (x.cmds, None),
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"while_clause": lambda x: (chain(x.condition, x.cmds), None),
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"until_clause": lambda x: (chain(x.condition, x.cmds), None),
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"simple_command": simple_command,
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"case_clause": case_clause,
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}
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for token in tokens:
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name, value = token
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try:
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more_tokens, words = token_handlers[name](value)
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except KeyError:
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raise NotImplementedError("Unsupported token type " + name)
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if more_tokens:
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self.process_tokens(more_tokens)
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if words:
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self.process_words(words)
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def process_words(self, words):
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"""Process a set of 'words' in pyshyacc parlance, which includes
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extraction of executed commands from $() blocks, as well as grabbing
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the command name argument.
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"""
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words = list(words)
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for word in list(words):
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wtree = pyshlex.make_wordtree(word[1])
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for part in wtree:
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if not isinstance(part, list):
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continue
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if part[0] in ('`', '$('):
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command = pyshlex.wordtree_as_string(part[1:-1])
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self.parse_shell(command)
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if word[0] in ("cmd_name", "cmd_word"):
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if word in words:
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words.remove(word)
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usetoken = False
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for word in words:
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if word[0] in ("cmd_name", "cmd_word") or \
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(usetoken and word[0] == "TOKEN"):
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if "=" in word[1]:
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usetoken = True
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continue
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cmd = word[1]
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if cmd.startswith("$"):
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self.log.debug(1, self.unhandled_template % cmd)
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elif cmd == "eval":
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command = " ".join(word for _, word in words[1:])
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self.parse_shell(command)
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else:
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self.allexecs.add(cmd)
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break
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