687 lines
23 KiB
Python
Executable File
687 lines
23 KiB
Python
Executable File
#! /usr/bin/python
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#
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# Protocol Buffers - Google's data interchange format
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# Copyright 2015 Google Inc. All rights reserved.
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# https://developers.google.com/protocol-buffers/
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following disclaimer
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# in the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of Google Inc. nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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"""PDDM - Poor Developers' Debug-able Macros
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A simple markup that can be added in comments of source so they can then be
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expanded out into code. Most of this could be done with CPP macros, but then
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developers can't really step through them in the debugger, this way they are
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expanded to the same code, but you can debug them.
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Any file can be processed, but the syntax is designed around a C based compiler.
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Processed lines start with "//%". There are three types of sections you can
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create: Text (left alone), Macro Definitions, and Macro Expansions. There is
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no order required between definitions and expansions, all definitions are read
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before any expansions are processed (thus, if desired, definitions can be put
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at the end of the file to keep them out of the way of the code).
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Macro Definitions are started with "//%PDDM-DEFINE Name(args)" and all lines
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afterwards that start with "//%" are included in the definition. Multiple
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macros can be defined in one block by just using a another "//%PDDM-DEFINE"
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line to start the next macro. Optionally, a macro can be ended with
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"//%PDDM-DEFINE-END", this can be useful when you want to make it clear that
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trailing blank lines are included in the macro. You can also end a definition
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with an expansion.
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Macro Expansions are started by single lines containing
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"//%PDDM-EXPAND Name(args)" and then with "//%PDDM-EXPAND-END" or another
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expansions. All lines in-between are replaced by the result of the expansion.
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The first line of the expansion is always a blank like just for readability.
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Expansion itself is pretty simple, one macro can invoke another macro, but
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you cannot nest the invoke of a macro in another macro (i.e. - can't do
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"foo(bar(a))", but you can define foo(a) and bar(b) where bar invokes foo()
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within its expansion.
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When macros are expanded, the arg references can also add "$O" suffix to the
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name (i.e. - "NAME$O") to specify an option to be applied. The options are:
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$S - Replace each character in the value with a space.
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$l - Lowercase the first letter of the value.
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$L - Lowercase the whole value.
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$u - Uppercase the first letter of the value.
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$U - Uppercase the whole value.
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Within a macro you can use ## to cause things to get joined together after
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expansion (i.e. - "a##b" within a macro will become "ab").
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Example:
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int foo(MyEnum x) {
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switch (x) {
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//%PDDM-EXPAND case(Enum_Left, 1)
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//%PDDM-EXPAND case(Enum_Center, 2)
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//%PDDM-EXPAND case(Enum_Right, 3)
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//%PDDM-EXPAND-END
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}
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//%PDDM-DEFINE case(_A, _B)
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//% case _A:
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//% return _B;
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A macro ends at the start of the next one, or an optional %PDDM-DEFINE-END
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can be used to avoid adding extra blank lines/returns (or make it clear when
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it is desired).
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One macro can invoke another by simply using its name NAME(ARGS). You cannot
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nest an invoke inside another (i.e. - NAME1(NAME2(ARGS)) isn't supported).
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Within a macro you can use ## to cause things to get joined together after
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processing (i.e. - "a##b" within a macro will become "ab").
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"""
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import optparse
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import os
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import re
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import sys
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# Regex for macro definition.
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_MACRO_RE = re.compile(r'(?P<name>\w+)\((?P<args>.*?)\)')
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# Regex for macro's argument definition.
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_MACRO_ARG_NAME_RE = re.compile(r'^\w+$')
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# Line inserted after each EXPAND.
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_GENERATED_CODE_LINE = (
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'// This block of code is generated, do not edit it directly.'
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)
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def _MacroRefRe(macro_names):
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# Takes in a list of macro names and makes a regex that will match invokes
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# of those macros.
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return re.compile(r'\b(?P<macro_ref>(?P<name>(%s))\((?P<args>.*?)\))' %
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'|'.join(macro_names))
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def _MacroArgRefRe(macro_arg_names):
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# Takes in a list of macro arg names and makes a regex that will match
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# uses of those args.
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return re.compile(r'\b(?P<name>(%s))(\$(?P<option>.))?\b' %
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'|'.join(macro_arg_names))
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class PDDMError(Exception):
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"""Error thrown by pddm."""
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pass
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class MacroCollection(object):
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"""Hold a set of macros and can resolve/expand them."""
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def __init__(self, a_file=None):
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"""Initializes the collection.
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Args:
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a_file: The file like stream to parse.
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Raises:
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PDDMError if there are any issues.
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"""
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self._macros = dict()
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if a_file:
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self.ParseInput(a_file)
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class MacroDefinition(object):
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"""Holds a macro definition."""
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def __init__(self, name, arg_names):
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self._name = name
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self._args = tuple(arg_names)
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self._body = ''
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self._needNewLine = False
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def AppendLine(self, line):
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if self._needNewLine:
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self._body += '\n'
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self._body += line
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self._needNewLine = not line.endswith('\n')
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@property
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def name(self):
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return self._name
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@property
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def args(self):
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return self._args
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@property
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def body(self):
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return self._body
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def ParseInput(self, a_file):
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"""Consumes input extracting definitions.
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Args:
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a_file: The file like stream to parse.
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Raises:
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PDDMError if there are any issues.
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"""
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input_lines = a_file.read().splitlines()
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self.ParseLines(input_lines)
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def ParseLines(self, input_lines):
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"""Parses list of lines.
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Args:
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input_lines: A list of strings of input to parse (no newlines on the
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strings).
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Raises:
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PDDMError if there are any issues.
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"""
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current_macro = None
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for line in input_lines:
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if line.startswith('PDDM-'):
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directive = line.split(' ', 1)[0]
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if directive == 'PDDM-DEFINE':
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name, args = self._ParseDefineLine(line)
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if self._macros.get(name):
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raise PDDMError('Attempt to redefine macro: "%s"' % line)
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current_macro = self.MacroDefinition(name, args)
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self._macros[name] = current_macro
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continue
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if directive == 'PDDM-DEFINE-END':
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if not current_macro:
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raise PDDMError('Got DEFINE-END directive without an active macro:'
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' "%s"' % line)
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current_macro = None
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continue
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raise PDDMError('Hit a line with an unknown directive: "%s"' % line)
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if current_macro:
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current_macro.AppendLine(line)
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continue
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# Allow blank lines between macro definitions.
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if line.strip() == '':
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continue
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raise PDDMError('Hit a line that wasn\'t a directive and no open macro'
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' definition: "%s"' % line)
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def _ParseDefineLine(self, input_line):
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assert input_line.startswith('PDDM-DEFINE')
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line = input_line[12:].strip()
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match = _MACRO_RE.match(line)
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# Must match full line
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if match is None or match.group(0) != line:
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raise PDDMError('Failed to parse macro definition: "%s"' % input_line)
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name = match.group('name')
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args_str = match.group('args').strip()
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args = []
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if args_str:
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for part in args_str.split(','):
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arg = part.strip()
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if arg == '':
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raise PDDMError('Empty arg name in macro definition: "%s"'
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% input_line)
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if not _MACRO_ARG_NAME_RE.match(arg):
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raise PDDMError('Invalid arg name "%s" in macro definition: "%s"'
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% (arg, input_line))
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if arg in args:
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raise PDDMError('Arg name "%s" used more than once in macro'
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' definition: "%s"' % (arg, input_line))
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args.append(arg)
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return (name, tuple(args))
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def Expand(self, macro_ref_str):
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"""Expands the macro reference.
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Args:
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macro_ref_str: String of a macro reference (i.e. foo(a, b)).
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Returns:
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The text from the expansion.
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Raises:
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PDDMError if there are any issues.
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"""
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match = _MACRO_RE.match(macro_ref_str)
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if match is None or match.group(0) != macro_ref_str:
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raise PDDMError('Failed to parse macro reference: "%s"' % macro_ref_str)
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if match.group('name') not in self._macros:
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raise PDDMError('No macro named "%s".' % match.group('name'))
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return self._Expand(match, [], macro_ref_str)
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def _FormatStack(self, macro_ref_stack):
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result = ''
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for _, macro_ref in reversed(macro_ref_stack):
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result += '\n...while expanding "%s".' % macro_ref
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return result
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def _Expand(self, macro_ref_match, macro_stack, macro_ref_str=None):
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if macro_ref_str is None:
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macro_ref_str = macro_ref_match.group('macro_ref')
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name = macro_ref_match.group('name')
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for prev_name, prev_macro_ref in macro_stack:
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if name == prev_name:
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raise PDDMError('Found macro recusion, invoking "%s":%s' %
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(macro_ref_str, self._FormatStack(macro_stack)))
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macro = self._macros[name]
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args_str = macro_ref_match.group('args').strip()
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args = []
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if args_str or len(macro.args):
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args = [x.strip() for x in args_str.split(',')]
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if len(args) != len(macro.args):
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raise PDDMError('Expected %d args, got: "%s".%s' %
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(len(macro.args), macro_ref_str,
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self._FormatStack(macro_stack)))
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# Replace args usages.
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result = self._ReplaceArgValues(macro, args, macro_ref_str, macro_stack)
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# Expand any macro invokes.
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new_macro_stack = macro_stack + [(name, macro_ref_str)]
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while True:
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eval_result = self._EvalMacrosRefs(result, new_macro_stack)
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# Consume all ## directives to glue things together.
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eval_result = eval_result.replace('##', '')
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if eval_result == result:
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break
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result = eval_result
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return result
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def _ReplaceArgValues(self,
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macro, arg_values, macro_ref_to_report, macro_stack):
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if len(arg_values) == 0:
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# Nothing to do
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return macro.body
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assert len(arg_values) == len(macro.args)
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args = dict(zip(macro.args, arg_values))
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def _lookupArg(match):
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val = args[match.group('name')]
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opt = match.group('option')
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if opt:
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if opt == 'S': # Spaces for the length
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return ' ' * len(val)
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elif opt == 'l': # Lowercase first character
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if val:
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return val[0].lower() + val[1:]
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else:
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return val
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elif opt == 'L': # All Lowercase
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return val.lower()
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elif opt == 'u': # Uppercase first character
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if val:
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return val[0].upper() + val[1:]
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else:
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return val
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elif opt == 'U': # All Uppercase
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return val.upper()
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else:
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raise PDDMError('Unknown arg option "%s$%s" while expanding "%s".%s'
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% (match.group('name'), match.group('option'),
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macro_ref_to_report,
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self._FormatStack(macro_stack)))
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return val
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# Let the regex do the work!
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macro_arg_ref_re = _MacroArgRefRe(macro.args)
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return macro_arg_ref_re.sub(_lookupArg, macro.body)
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def _EvalMacrosRefs(self, text, macro_stack):
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macro_ref_re = _MacroRefRe(self._macros.keys())
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def _resolveMacro(match):
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return self._Expand(match, macro_stack)
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return macro_ref_re.sub(_resolveMacro, text)
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class SourceFile(object):
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"""Represents a source file with PDDM directives in it."""
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def __init__(self, a_file, import_resolver=None):
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"""Initializes the file reading in the file.
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Args:
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a_file: The file to read in.
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import_resolver: a function that given a path will return a stream for
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the contents.
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Raises:
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PDDMError if there are any issues.
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"""
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self._sections = []
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self._original_content = a_file.read()
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self._import_resolver = import_resolver
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self._processed_content = None
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class SectionBase(object):
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def __init__(self, first_line_num):
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self._lines = []
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self._first_line_num = first_line_num
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def TryAppend(self, line, line_num):
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"""Try appending a line.
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Args:
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line: The line to append.
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line_num: The number of the line.
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Returns:
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A tuple of (SUCCESS, CAN_ADD_MORE). If SUCCESS if False, the line
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wasn't append. If SUCCESS is True, then CAN_ADD_MORE is True/False to
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indicate if more lines can be added after this one.
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"""
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assert False, "sublcass should have overridden"
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return (False, False)
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def HitEOF(self):
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"""Called when the EOF was reached for for a given section."""
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pass
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def BindMacroCollection(self, macro_collection):
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"""Binds the chunk to a macro collection.
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Args:
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macro_collection: The collection to bind too.
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"""
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pass
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def Append(self, line):
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self._lines.append(line)
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@property
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def lines(self):
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return self._lines
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@property
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def num_lines_captured(self):
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return len(self._lines)
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@property
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def first_line_num(self):
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return self._first_line_num
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@property
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def first_line(self):
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if not self._lines:
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return ''
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return self._lines[0]
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@property
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def text(self):
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return '\n'.join(self.lines) + '\n'
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class TextSection(SectionBase):
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"""Text section that is echoed out as is."""
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def TryAppend(self, line, line_num):
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if line.startswith('//%PDDM'):
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return (False, False)
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self.Append(line)
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return (True, True)
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class ExpansionSection(SectionBase):
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"""Section that is the result of an macro expansion."""
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def __init__(self, first_line_num):
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SourceFile.SectionBase.__init__(self, first_line_num)
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self._macro_collection = None
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def TryAppend(self, line, line_num):
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if line.startswith('//%PDDM'):
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directive = line.split(' ', 1)[0]
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if directive == '//%PDDM-EXPAND':
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self.Append(line)
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return (True, True)
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if directive == '//%PDDM-EXPAND-END':
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assert self.num_lines_captured > 0
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return (True, False)
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raise PDDMError('Ran into directive ("%s", line %d) while in "%s".' %
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(directive, line_num, self.first_line))
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# Eat other lines.
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return (True, True)
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def HitEOF(self):
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raise PDDMError('Hit the end of the file while in "%s".' %
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self.first_line)
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def BindMacroCollection(self, macro_collection):
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self._macro_collection = macro_collection
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@property
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def lines(self):
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captured_lines = SourceFile.SectionBase.lines.fget(self)
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directive_len = len('//%PDDM-EXPAND')
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result = []
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for line in captured_lines:
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result.append(line)
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if self._macro_collection:
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# Always add a blank line, seems to read better. (If need be, add an
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# option to the EXPAND to indicate if this should be done.)
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result.extend([_GENERATED_CODE_LINE, ''])
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macro = line[directive_len:].strip()
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try:
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expand_result = self._macro_collection.Expand(macro)
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# Since expansions are line oriented, strip trailing whitespace
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# from the lines.
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lines = [x.rstrip() for x in expand_result.split('\n')]
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result.append('\n'.join(lines))
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except PDDMError as e:
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raise PDDMError('%s\n...while expanding "%s" from the section'
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' that started:\n Line %d: %s' %
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(e.message, macro,
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self.first_line_num, self.first_line))
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# Add the ending marker.
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if len(captured_lines) == 1:
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result.append('//%%PDDM-EXPAND-END %s' %
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captured_lines[0][directive_len:].strip())
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else:
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result.append('//%%PDDM-EXPAND-END (%s expansions)' % len(captured_lines))
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return result
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class DefinitionSection(SectionBase):
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"""Section containing macro definitions"""
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def TryAppend(self, line, line_num):
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if not line.startswith('//%'):
|
|
return (False, False)
|
|
if line.startswith('//%PDDM'):
|
|
directive = line.split(' ', 1)[0]
|
|
if directive == "//%PDDM-EXPAND":
|
|
return False, False
|
|
if directive not in ('//%PDDM-DEFINE', '//%PDDM-DEFINE-END'):
|
|
raise PDDMError('Ran into directive ("%s", line %d) while in "%s".' %
|
|
(directive, line_num, self.first_line))
|
|
self.Append(line)
|
|
return (True, True)
|
|
|
|
def BindMacroCollection(self, macro_collection):
|
|
if macro_collection:
|
|
try:
|
|
# Parse the lines after stripping the prefix.
|
|
macro_collection.ParseLines([x[3:] for x in self.lines])
|
|
except PDDMError as e:
|
|
raise PDDMError('%s\n...while parsing section that started:\n'
|
|
' Line %d: %s' %
|
|
(e.message, self.first_line_num, self.first_line))
|
|
|
|
class ImportDefinesSection(SectionBase):
|
|
"""Section containing an import of PDDM-DEFINES from an external file."""
|
|
|
|
def __init__(self, first_line_num, import_resolver):
|
|
SourceFile.SectionBase.__init__(self, first_line_num)
|
|
self._import_resolver = import_resolver
|
|
|
|
def TryAppend(self, line, line_num):
|
|
if not line.startswith('//%PDDM-IMPORT-DEFINES '):
|
|
return (False, False)
|
|
assert self.num_lines_captured == 0
|
|
self.Append(line)
|
|
return (True, False)
|
|
|
|
def BindMacroCollection(self, macro_colletion):
|
|
if not macro_colletion:
|
|
return
|
|
if self._import_resolver is None:
|
|
raise PDDMError('Got an IMPORT-DEFINES without a resolver (line %d):'
|
|
' "%s".' % (self.first_line_num, self.first_line))
|
|
import_name = self.first_line.split(' ', 1)[1].strip()
|
|
imported_file = self._import_resolver(import_name)
|
|
if imported_file is None:
|
|
raise PDDMError('Resolver failed to find "%s" (line %d):'
|
|
' "%s".' %
|
|
(import_name, self.first_line_num, self.first_line))
|
|
try:
|
|
imported_src_file = SourceFile(imported_file, self._import_resolver)
|
|
imported_src_file._ParseFile()
|
|
for section in imported_src_file._sections:
|
|
section.BindMacroCollection(macro_colletion)
|
|
except PDDMError as e:
|
|
raise PDDMError('%s\n...while importing defines:\n'
|
|
' Line %d: %s' %
|
|
(e.message, self.first_line_num, self.first_line))
|
|
|
|
def _ParseFile(self):
|
|
self._sections = []
|
|
lines = self._original_content.splitlines()
|
|
cur_section = None
|
|
for line_num, line in enumerate(lines, 1):
|
|
if not cur_section:
|
|
cur_section = self._MakeSection(line, line_num)
|
|
was_added, accept_more = cur_section.TryAppend(line, line_num)
|
|
if not was_added:
|
|
cur_section = self._MakeSection(line, line_num)
|
|
was_added, accept_more = cur_section.TryAppend(line, line_num)
|
|
assert was_added
|
|
if not accept_more:
|
|
cur_section = None
|
|
|
|
if cur_section:
|
|
cur_section.HitEOF()
|
|
|
|
def _MakeSection(self, line, line_num):
|
|
if not line.startswith('//%PDDM'):
|
|
section = self.TextSection(line_num)
|
|
else:
|
|
directive = line.split(' ', 1)[0]
|
|
if directive == '//%PDDM-EXPAND':
|
|
section = self.ExpansionSection(line_num)
|
|
elif directive == '//%PDDM-DEFINE':
|
|
section = self.DefinitionSection(line_num)
|
|
elif directive == '//%PDDM-IMPORT-DEFINES':
|
|
section = self.ImportDefinesSection(line_num, self._import_resolver)
|
|
else:
|
|
raise PDDMError('Unexpected line %d: "%s".' % (line_num, line))
|
|
self._sections.append(section)
|
|
return section
|
|
|
|
def ProcessContent(self, strip_expansion=False):
|
|
"""Processes the file contents."""
|
|
self._ParseFile()
|
|
if strip_expansion:
|
|
# Without a collection the expansions become blank, removing them.
|
|
collection = None
|
|
else:
|
|
collection = MacroCollection()
|
|
for section in self._sections:
|
|
section.BindMacroCollection(collection)
|
|
result = ''
|
|
for section in self._sections:
|
|
result += section.text
|
|
self._processed_content = result
|
|
|
|
@property
|
|
def original_content(self):
|
|
return self._original_content
|
|
|
|
@property
|
|
def processed_content(self):
|
|
return self._processed_content
|
|
|
|
|
|
def main(args):
|
|
usage = '%prog [OPTIONS] PATH ...'
|
|
description = (
|
|
'Processes PDDM directives in the given paths and write them back out.'
|
|
)
|
|
parser = optparse.OptionParser(usage=usage, description=description)
|
|
parser.add_option('--dry-run',
|
|
default=False, action='store_true',
|
|
help='Don\'t write back to the file(s), just report if the'
|
|
' contents needs an update and exit with a value of 1.')
|
|
parser.add_option('--verbose',
|
|
default=False, action='store_true',
|
|
help='Reports is a file is already current.')
|
|
parser.add_option('--collapse',
|
|
default=False, action='store_true',
|
|
help='Removes all the generated code.')
|
|
opts, extra_args = parser.parse_args(args)
|
|
|
|
if not extra_args:
|
|
parser.error('Need atleast one file to process')
|
|
|
|
result = 0
|
|
for a_path in extra_args:
|
|
if not os.path.exists(a_path):
|
|
sys.stderr.write('ERROR: File not found: %s\n' % a_path)
|
|
return 100
|
|
|
|
def _ImportResolver(name):
|
|
# resolve based on the file being read.
|
|
a_dir = os.path.dirname(a_path)
|
|
import_path = os.path.join(a_dir, name)
|
|
if not os.path.exists(import_path):
|
|
return None
|
|
return open(import_path, 'r')
|
|
|
|
with open(a_path, 'r') as f:
|
|
src_file = SourceFile(f, _ImportResolver)
|
|
|
|
try:
|
|
src_file.ProcessContent(strip_expansion=opts.collapse)
|
|
except PDDMError as e:
|
|
sys.stderr.write('ERROR: %s\n...While processing "%s"\n' %
|
|
(e.message, a_path))
|
|
return 101
|
|
|
|
if src_file.processed_content != src_file.original_content:
|
|
if not opts.dry_run:
|
|
print 'Updating for "%s".' % a_path
|
|
with open(a_path, 'w') as f:
|
|
f.write(src_file.processed_content)
|
|
else:
|
|
# Special result to indicate things need updating.
|
|
print 'Update needed for "%s".' % a_path
|
|
result = 1
|
|
elif opts.verbose:
|
|
print 'No update for "%s".' % a_path
|
|
|
|
return result
|
|
|
|
|
|
if __name__ == '__main__':
|
|
sys.exit(main(sys.argv[1:]))
|