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123 lines
4.8 KiB
Python
123 lines
4.8 KiB
Python
# ***** BEGIN LICENSE BLOCK *****
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# Version: MPL 1.1/GPL 2.0/LGPL 2.1
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#
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# The contents of this file are subject to the Mozilla Public License Version
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# 1.1 (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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# http://www.mozilla.org/MPL/
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#
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# Software distributed under the License is distributed on an "AS IS" basis,
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# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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# for the specific language governing rights and limitations under the
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# License.
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#
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# The Original Code is mozilla.org code
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#
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# The Initial Developer of the Original Code is mozilla.org.
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# Portions created by the Initial Developer are Copyright (C) 2005
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# the Initial Developer. All Rights Reserved.
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#
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# Contributor(s):
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# Mark Hammond: initial author
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#
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# Alternatively, the contents of this file may be used under the terms of
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# either the GNU General Public License Version 2 or later (the "GPL"), or
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# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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# in which case the provisions of the GPL or the LGPL are applicable instead
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# of those above. If you wish to allow use of your version of this file only
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# under the terms of either the GPL or the LGPL, and not to allow others to
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# use your version of this file under the terms of the MPL, indicate your
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# decision by deleting the provisions above and replace them with the notice
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# and other provisions required by the GPL or the LGPL. If you do not delete
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# the provisions above, a recipient may use your version of this file under
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# the terms of any one of the MPL, the GPL or the LGPL.
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#
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# ***** END LICENSE BLOCK *****
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# A utility for compiling Python code, using features not available via
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# the builtin compile.
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#
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# (a) It is not possible to compile the body of a Python function, without the
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# function declaration. ie, 'return None' will always give a syntax error when
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# passed to compile.
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# (b) It is very tricky to compile code with the line-number starting at
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# anything other than zero.
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#
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# Both of these are solved by this module, which uses the 'compiler' module
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# XXX - sad side-effect is that Unicode is not correctly supported -
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# PyCF_SOURCE_IS_UTF8 is not exposed via compiler (in 2.3 at least)
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# On the upside here, all 'src' params are unicode today, so expansion here
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# requires no interface changes.
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from compiler import parse, syntax, compile
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from compiler.pycodegen import ModuleCodeGenerator
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import compiler.ast
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import new
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def _fix_src(src):
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# windows first - \r\n -> \n, then for mac, remaining \r -> \n
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# Trailing whitespace can cause problems - make sure a final '\n' exists.
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return src.replace("\r\n", "\n").replace("\r", "\n") + "\n"
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# from compiler.misc.set_filename - but we also adjust lineno attributes.
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def set_filename_and_offset(filename, offset, tree):
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"""Set the filename attribute to filename on every node in tree"""
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worklist = [tree]
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while worklist:
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node = worklist.pop(0)
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node.filename = filename
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if node.lineno is not None:
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node.lineno += offset
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worklist.extend(node.getChildNodes())
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def parse_function(src, func_name, arg_names, defaults=[]):
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tree = parse(src, "exec")
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defaults = [compiler.ast.Const(d) for d in defaults]
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# Insert a Stmt with function object.
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try:
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decs = compiler.ast.Decorators([])
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except AttributeError:
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# 2.3 has no such concept (and different args!)
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func = compiler.ast.Function(func_name, arg_names, defaults, 0, None,
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tree.node)
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else:
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# 2.4 and later
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func = compiler.ast.Function(decs, func_name, arg_names, defaults, 0, None,
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tree.node)
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stmt = compiler.ast.Stmt((func,))
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tree.node = stmt
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syntax.check(tree)
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return tree
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def compile_function(src, filename, func_name, arg_names, defaults=[],
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# more args to come...
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lineno=0):
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assert filename, "filename is required"
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try:
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tree = parse_function(_fix_src(src), func_name, arg_names, defaults)
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except SyntaxError, err:
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err.lineno += lineno
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err.filename = filename
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raise SyntaxError, err
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set_filename_and_offset(filename, lineno, tree)
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gen = ModuleCodeGenerator(tree)
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return gen.getCode()
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# And a 'standard' compile, but with the filename offset feature.
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def compile(src, filename, mode='exec', flags=None, dont_inherit=None, lineno=0):
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if flags is not None or dont_inherit is not None or mode != 'exec':
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raise RuntimeError, "not implemented yet"
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try:
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tree = parse(_fix_src(src), mode)
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except SyntaxError, err:
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err.lineno += lineno
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err.filename = filename
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raise SyntaxError, err
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set_filename_and_offset(filename, lineno, tree)
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gen = ModuleCodeGenerator(tree)
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return gen.getCode()
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