| 1 | #!/usr/bin/env python
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| 2 | #
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| 3 | # Copyright 2008, Google Inc.
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| 4 | # All rights reserved.
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| 5 | #
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| 6 | # Redistribution and use in source and binary forms, with or without
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| 7 | # modification, are permitted provided that the following conditions are
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| 8 | # met:
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| 9 | #
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| 10 | # * Redistributions of source code must retain the above copyright
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| 11 | # notice, this list of conditions and the following disclaimer.
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| 12 | # * Redistributions in binary form must reproduce the above
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| 13 | # copyright notice, this list of conditions and the following disclaimer
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| 14 | # in the documentation and/or other materials provided with the
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| 15 | # distribution.
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| 16 | # * Neither the name of Google Inc. nor the names of its
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| 17 | # contributors may be used to endorse or promote products derived from
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| 18 | # this software without specific prior written permission.
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| 19 | #
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| 20 | # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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| 21 | # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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| 22 | # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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| 23 | # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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| 24 | # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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| 25 | # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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| 26 | # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 27 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 28 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 29 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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| 30 | # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 31 |
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| 32 | """pump v0.2.0 - Pretty Useful for Meta Programming.
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| 33 |
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| 34 | A tool for preprocessor meta programming. Useful for generating
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| 35 | repetitive boilerplate code. Especially useful for writing C++
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| 36 | classes, functions, macros, and templates that need to work with
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| 37 | various number of arguments.
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| 38 |
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| 39 | USAGE:
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| 40 | pump.py SOURCE_FILE
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| 41 |
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| 42 | EXAMPLES:
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| 43 | pump.py foo.cc.pump
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| 44 | Converts foo.cc.pump to foo.cc.
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| 45 |
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| 46 | GRAMMAR:
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| 47 | CODE ::= ATOMIC_CODE*
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| 48 | ATOMIC_CODE ::= $var ID = EXPRESSION
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| 49 | | $var ID = [[ CODE ]]
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| 50 | | $range ID EXPRESSION..EXPRESSION
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| 51 | | $for ID SEPARATOR [[ CODE ]]
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| 52 | | $($)
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| 53 | | $ID
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| 54 | | $(EXPRESSION)
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| 55 | | $if EXPRESSION [[ CODE ]] ELSE_BRANCH
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| 56 | | [[ CODE ]]
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| 57 | | RAW_CODE
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| 58 | SEPARATOR ::= RAW_CODE | EMPTY
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| 59 | ELSE_BRANCH ::= $else [[ CODE ]]
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| 60 | | $elif EXPRESSION [[ CODE ]] ELSE_BRANCH
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| 61 | | EMPTY
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| 62 | EXPRESSION has Python syntax.
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| 63 | """
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| 64 |
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| 65 | __author__ = 'wan@google.com (Zhanyong Wan)'
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| 66 |
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| 67 | import os
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| 68 | import re
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| 69 | import sys
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| 70 |
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| 71 |
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| 72 | TOKEN_TABLE = [
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| 73 | (re.compile(r'\$var\s+'), '$var'),
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| 74 | (re.compile(r'\$elif\s+'), '$elif'),
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| 75 | (re.compile(r'\$else\s+'), '$else'),
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| 76 | (re.compile(r'\$for\s+'), '$for'),
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| 77 | (re.compile(r'\$if\s+'), '$if'),
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| 78 | (re.compile(r'\$range\s+'), '$range'),
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| 79 | (re.compile(r'\$[_A-Za-z]\w*'), '$id'),
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| 80 | (re.compile(r'\$\(\$\)'), '$($)'),
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| 81 | (re.compile(r'\$'), '$'),
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| 82 | (re.compile(r'\[\[\n?'), '[['),
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| 83 | (re.compile(r'\]\]\n?'), ']]'),
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| 84 | ]
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| 85 |
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| 86 |
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| 87 | class Cursor:
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| 88 | """Represents a position (line and column) in a text file."""
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| 89 |
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| 90 | def __init__(self, line=-1, column=-1):
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| 91 | self.line = line
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| 92 | self.column = column
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| 93 |
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| 94 | def __eq__(self, rhs):
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| 95 | return self.line == rhs.line and self.column == rhs.column
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| 96 |
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| 97 | def __ne__(self, rhs):
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| 98 | return not self == rhs
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| 99 |
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| 100 | def __lt__(self, rhs):
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| 101 | return self.line < rhs.line or (
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| 102 | self.line == rhs.line and self.column < rhs.column)
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| 103 |
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| 104 | def __le__(self, rhs):
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| 105 | return self < rhs or self == rhs
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| 106 |
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| 107 | def __gt__(self, rhs):
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| 108 | return rhs < self
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| 109 |
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| 110 | def __ge__(self, rhs):
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| 111 | return rhs <= self
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| 112 |
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| 113 | def __str__(self):
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| 114 | if self == Eof():
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| 115 | return 'EOF'
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| 116 | else:
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| 117 | return '%s(%s)' % (self.line + 1, self.column)
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| 118 |
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| 119 | def __add__(self, offset):
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| 120 | return Cursor(self.line, self.column + offset)
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| 121 |
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| 122 | def __sub__(self, offset):
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| 123 | return Cursor(self.line, self.column - offset)
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| 124 |
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| 125 | def Clone(self):
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| 126 | """Returns a copy of self."""
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| 127 |
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| 128 | return Cursor(self.line, self.column)
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| 129 |
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| 130 |
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| 131 | # Special cursor to indicate the end-of-file.
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| 132 | def Eof():
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| 133 | """Returns the special cursor to denote the end-of-file."""
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| 134 | return Cursor(-1, -1)
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| 135 |
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| 136 |
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| 137 | class Token:
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| 138 | """Represents a token in a Pump source file."""
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| 139 |
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| 140 | def __init__(self, start=None, end=None, value=None, token_type=None):
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| 141 | if start is None:
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| 142 | self.start = Eof()
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| 143 | else:
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| 144 | self.start = start
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| 145 | if end is None:
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| 146 | self.end = Eof()
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| 147 | else:
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| 148 | self.end = end
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| 149 | self.value = value
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| 150 | self.token_type = token_type
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| 151 |
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| 152 | def __str__(self):
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| 153 | return 'Token @%s: \'%s\' type=%s' % (
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| 154 | self.start, self.value, self.token_type)
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| 155 |
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| 156 | def Clone(self):
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| 157 | """Returns a copy of self."""
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| 158 |
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| 159 | return Token(self.start.Clone(), self.end.Clone(), self.value,
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| 160 | self.token_type)
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| 161 |
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| 162 |
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| 163 | def StartsWith(lines, pos, string):
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| 164 | """Returns True iff the given position in lines starts with 'string'."""
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| 165 |
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| 166 | return lines[pos.line][pos.column:].startswith(string)
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| 167 |
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| 168 |
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| 169 | def FindFirstInLine(line, token_table):
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| 170 | best_match_start = -1
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| 171 | for (regex, token_type) in token_table:
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| 172 | m = regex.search(line)
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| 173 | if m:
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| 174 | # We found regex in lines
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| 175 | if best_match_start < 0 or m.start() < best_match_start:
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| 176 | best_match_start = m.start()
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| 177 | best_match_length = m.end() - m.start()
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| 178 | best_match_token_type = token_type
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| 179 |
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| 180 | if best_match_start < 0:
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| 181 | return None
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| 182 |
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| 183 | return (best_match_start, best_match_length, best_match_token_type)
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| 184 |
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| 185 |
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| 186 | def FindFirst(lines, token_table, cursor):
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| 187 | """Finds the first occurrence of any string in strings in lines."""
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| 188 |
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| 189 | start = cursor.Clone()
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| 190 | cur_line_number = cursor.line
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| 191 | for line in lines[start.line:]:
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| 192 | if cur_line_number == start.line:
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| 193 | line = line[start.column:]
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| 194 | m = FindFirstInLine(line, token_table)
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| 195 | if m:
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| 196 | # We found a regex in line.
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| 197 | (start_column, length, token_type) = m
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| 198 | if cur_line_number == start.line:
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| 199 | start_column += start.column
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| 200 | found_start = Cursor(cur_line_number, start_column)
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| 201 | found_end = found_start + length
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| 202 | return MakeToken(lines, found_start, found_end, token_type)
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| 203 | cur_line_number += 1
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| 204 | # We failed to find str in lines
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| 205 | return None
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| 206 |
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| 207 |
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| 208 | def SubString(lines, start, end):
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| 209 | """Returns a substring in lines."""
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| 210 |
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| 211 | if end == Eof():
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| 212 | end = Cursor(len(lines) - 1, len(lines[-1]))
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| 213 |
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| 214 | if start >= end:
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| 215 | return ''
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| 216 |
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| 217 | if start.line == end.line:
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| 218 | return lines[start.line][start.column:end.column]
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| 219 |
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| 220 | result_lines = ([lines[start.line][start.column:]] +
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| 221 | lines[start.line + 1:end.line] +
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| 222 | [lines[end.line][:end.column]])
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| 223 | return ''.join(result_lines)
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| 224 |
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| 225 |
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| 226 | def StripMetaComments(str):
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| 227 | """Strip meta comments from each line in the given string."""
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| 228 |
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| 229 | # First, completely remove lines containing nothing but a meta
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| 230 | # comment, including the trailing \n.
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| 231 | str = re.sub(r'^\s*\$\$.*\n', '', str)
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| 232 |
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| 233 | # Then, remove meta comments from contentful lines.
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| 234 | return re.sub(r'\s*\$\$.*', '', str)
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| 235 |
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| 236 |
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| 237 | def MakeToken(lines, start, end, token_type):
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| 238 | """Creates a new instance of Token."""
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| 239 |
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| 240 | return Token(start, end, SubString(lines, start, end), token_type)
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| 241 |
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| 242 |
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| 243 | def ParseToken(lines, pos, regex, token_type):
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| 244 | line = lines[pos.line][pos.column:]
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| 245 | m = regex.search(line)
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| 246 | if m and not m.start():
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| 247 | return MakeToken(lines, pos, pos + m.end(), token_type)
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| 248 | else:
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| 249 | print 'ERROR: %s expected at %s.' % (token_type, pos)
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| 250 | sys.exit(1)
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| 251 |
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| 252 |
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| 253 | ID_REGEX = re.compile(r'[_A-Za-z]\w*')
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| 254 | EQ_REGEX = re.compile(r'=')
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| 255 | REST_OF_LINE_REGEX = re.compile(r'.*?(?=$|\$\$)')
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| 256 | OPTIONAL_WHITE_SPACES_REGEX = re.compile(r'\s*')
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| 257 | WHITE_SPACE_REGEX = re.compile(r'\s')
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| 258 | DOT_DOT_REGEX = re.compile(r'\.\.')
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| 259 |
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| 260 |
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| 261 | def Skip(lines, pos, regex):
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| 262 | line = lines[pos.line][pos.column:]
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| 263 | m = re.search(regex, line)
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| 264 | if m and not m.start():
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| 265 | return pos + m.end()
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| 266 | else:
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| 267 | return pos
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| 268 |
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| 269 |
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| 270 | def SkipUntil(lines, pos, regex, token_type):
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| 271 | line = lines[pos.line][pos.column:]
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| 272 | m = re.search(regex, line)
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| 273 | if m:
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| 274 | return pos + m.start()
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| 275 | else:
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| 276 | print ('ERROR: %s expected on line %s after column %s.' %
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| 277 | (token_type, pos.line + 1, pos.column))
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| 278 | sys.exit(1)
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| 279 |
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| 280 |
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| 281 | def ParseExpTokenInParens(lines, pos):
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| 282 | def ParseInParens(pos):
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| 283 | pos = Skip(lines, pos, OPTIONAL_WHITE_SPACES_REGEX)
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| 284 | pos = Skip(lines, pos, r'\(')
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| 285 | pos = Parse(pos)
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| 286 | pos = Skip(lines, pos, r'\)')
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| 287 | return pos
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| 288 |
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| 289 | def Parse(pos):
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| 290 | pos = SkipUntil(lines, pos, r'\(|\)', ')')
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| 291 | if SubString(lines, pos, pos + 1) == '(':
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| 292 | pos = Parse(pos + 1)
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| 293 | pos = Skip(lines, pos, r'\)')
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| 294 | return Parse(pos)
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| 295 | else:
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| 296 | return pos
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| 297 |
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| 298 | start = pos.Clone()
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| 299 | pos = ParseInParens(pos)
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| 300 | return MakeToken(lines, start, pos, 'exp')
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| 301 |
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| 302 |
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| 303 | def RStripNewLineFromToken(token):
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| 304 | if token.value.endswith('\n'):
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| 305 | return Token(token.start, token.end, token.value[:-1], token.token_type)
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| 306 | else:
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| 307 | return token
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| 308 |
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| 309 |
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| 310 | def TokenizeLines(lines, pos):
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| 311 | while True:
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| 312 | found = FindFirst(lines, TOKEN_TABLE, pos)
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| 313 | if not found:
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| 314 | yield MakeToken(lines, pos, Eof(), 'code')
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| 315 | return
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| 316 |
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| 317 | if found.start == pos:
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| 318 | prev_token = None
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| 319 | prev_token_rstripped = None
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| 320 | else:
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| 321 | prev_token = MakeToken(lines, pos, found.start, 'code')
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| 322 | prev_token_rstripped = RStripNewLineFromToken(prev_token)
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| 323 |
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| 324 | if found.token_type == '$var':
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| 325 | if prev_token_rstripped:
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| 326 | yield prev_token_rstripped
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| 327 | yield found
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| 328 | id_token = ParseToken(lines, found.end, ID_REGEX, 'id')
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| 329 | yield id_token
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| 330 | pos = Skip(lines, id_token.end, OPTIONAL_WHITE_SPACES_REGEX)
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| 331 |
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| 332 | eq_token = ParseToken(lines, pos, EQ_REGEX, '=')
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| 333 | yield eq_token
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| 334 | pos = Skip(lines, eq_token.end, r'\s*')
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| 335 |
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| 336 | if SubString(lines, pos, pos + 2) != '[[':
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| 337 | exp_token = ParseToken(lines, pos, REST_OF_LINE_REGEX, 'exp')
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| 338 | yield exp_token
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| 339 | pos = Cursor(exp_token.end.line + 1, 0)
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| 340 | elif found.token_type == '$for':
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| 341 | if prev_token_rstripped:
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| 342 | yield prev_token_rstripped
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| 343 | yield found
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| 344 | id_token = ParseToken(lines, found.end, ID_REGEX, 'id')
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| 345 | yield id_token
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| 346 | pos = Skip(lines, id_token.end, WHITE_SPACE_REGEX)
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| 347 | elif found.token_type == '$range':
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| 348 | if prev_token_rstripped:
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| 349 | yield prev_token_rstripped
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| 350 | yield found
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| 351 | id_token = ParseToken(lines, found.end, ID_REGEX, 'id')
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| 352 | yield id_token
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| 353 | pos = Skip(lines, id_token.end, OPTIONAL_WHITE_SPACES_REGEX)
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| 354 |
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| 355 | dots_pos = SkipUntil(lines, pos, DOT_DOT_REGEX, '..')
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| 356 | yield MakeToken(lines, pos, dots_pos, 'exp')
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| 357 | yield MakeToken(lines, dots_pos, dots_pos + 2, '..')
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| 358 | pos = dots_pos + 2
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| 359 | new_pos = Cursor(pos.line + 1, 0)
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| 360 | yield MakeToken(lines, pos, new_pos, 'exp')
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| 361 | pos = new_pos
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| 362 | elif found.token_type == '$':
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| 363 | if prev_token:
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| 364 | yield prev_token
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| 365 | yield found
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| 366 | exp_token = ParseExpTokenInParens(lines, found.end)
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| 367 | yield exp_token
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| 368 | pos = exp_token.end
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| 369 | elif (found.token_type == ']]' or found.token_type == '$if' or
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| 370 | found.token_type == '$elif' or found.token_type == '$else'):
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| 371 | if prev_token_rstripped:
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| 372 | yield prev_token_rstripped
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| 373 | yield found
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| 374 | pos = found.end
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| 375 | else:
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| 376 | if prev_token:
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| 377 | yield prev_token
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| 378 | yield found
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| 379 | pos = found.end
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| 380 |
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| 381 |
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| 382 | def Tokenize(s):
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| 383 | """A generator that yields the tokens in the given string."""
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| 384 | if s != '':
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| 385 | lines = s.splitlines(True)
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| 386 | for token in TokenizeLines(lines, Cursor(0, 0)):
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| 387 | yield token
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| 388 |
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| 389 |
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| 390 | class CodeNode:
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| 391 | def __init__(self, atomic_code_list=None):
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| 392 | self.atomic_code = atomic_code_list
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| 393 |
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| 394 |
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| 395 | class VarNode:
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| 396 | def __init__(self, identifier=None, atomic_code=None):
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| 397 | self.identifier = identifier
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| 398 | self.atomic_code = atomic_code
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| 399 |
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| 400 |
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| 401 | class RangeNode:
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| 402 | def __init__(self, identifier=None, exp1=None, exp2=None):
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| 403 | self.identifier = identifier
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| 404 | self.exp1 = exp1
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| 405 | self.exp2 = exp2
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| 406 |
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| 407 |
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| 408 | class ForNode:
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| 409 | def __init__(self, identifier=None, sep=None, code=None):
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| 410 | self.identifier = identifier
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| 411 | self.sep = sep
|
|---|
| 412 | self.code = code
|
|---|
| 413 |
|
|---|
| 414 |
|
|---|
| 415 | class ElseNode:
|
|---|
| 416 | def __init__(self, else_branch=None):
|
|---|
| 417 | self.else_branch = else_branch
|
|---|
| 418 |
|
|---|
| 419 |
|
|---|
| 420 | class IfNode:
|
|---|
| 421 | def __init__(self, exp=None, then_branch=None, else_branch=None):
|
|---|
| 422 | self.exp = exp
|
|---|
| 423 | self.then_branch = then_branch
|
|---|
| 424 | self.else_branch = else_branch
|
|---|
| 425 |
|
|---|
| 426 |
|
|---|
| 427 | class RawCodeNode:
|
|---|
| 428 | def __init__(self, token=None):
|
|---|
| 429 | self.raw_code = token
|
|---|
| 430 |
|
|---|
| 431 |
|
|---|
| 432 | class LiteralDollarNode:
|
|---|
| 433 | def __init__(self, token):
|
|---|
| 434 | self.token = token
|
|---|
| 435 |
|
|---|
| 436 |
|
|---|
| 437 | class ExpNode:
|
|---|
| 438 | def __init__(self, token, python_exp):
|
|---|
| 439 | self.token = token
|
|---|
| 440 | self.python_exp = python_exp
|
|---|
| 441 |
|
|---|
| 442 |
|
|---|
| 443 | def PopFront(a_list):
|
|---|
| 444 | head = a_list[0]
|
|---|
| 445 | a_list[:1] = []
|
|---|
| 446 | return head
|
|---|
| 447 |
|
|---|
| 448 |
|
|---|
| 449 | def PushFront(a_list, elem):
|
|---|
| 450 | a_list[:0] = [elem]
|
|---|
| 451 |
|
|---|
| 452 |
|
|---|
| 453 | def PopToken(a_list, token_type=None):
|
|---|
| 454 | token = PopFront(a_list)
|
|---|
| 455 | if token_type is not None and token.token_type != token_type:
|
|---|
| 456 | print 'ERROR: %s expected at %s' % (token_type, token.start)
|
|---|
| 457 | print 'ERROR: %s found instead' % (token,)
|
|---|
| 458 | sys.exit(1)
|
|---|
| 459 |
|
|---|
| 460 | return token
|
|---|
| 461 |
|
|---|
| 462 |
|
|---|
| 463 | def PeekToken(a_list):
|
|---|
| 464 | if not a_list:
|
|---|
| 465 | return None
|
|---|
| 466 |
|
|---|
| 467 | return a_list[0]
|
|---|
| 468 |
|
|---|
| 469 |
|
|---|
| 470 | def ParseExpNode(token):
|
|---|
| 471 | python_exp = re.sub(r'([_A-Za-z]\w*)', r'self.GetValue("\1")', token.value)
|
|---|
| 472 | return ExpNode(token, python_exp)
|
|---|
| 473 |
|
|---|
| 474 |
|
|---|
| 475 | def ParseElseNode(tokens):
|
|---|
| 476 | def Pop(token_type=None):
|
|---|
| 477 | return PopToken(tokens, token_type)
|
|---|
| 478 |
|
|---|
| 479 | next = PeekToken(tokens)
|
|---|
| 480 | if not next:
|
|---|
| 481 | return None
|
|---|
| 482 | if next.token_type == '$else':
|
|---|
| 483 | Pop('$else')
|
|---|
| 484 | Pop('[[')
|
|---|
| 485 | code_node = ParseCodeNode(tokens)
|
|---|
| 486 | Pop(']]')
|
|---|
| 487 | return code_node
|
|---|
| 488 | elif next.token_type == '$elif':
|
|---|
| 489 | Pop('$elif')
|
|---|
| 490 | exp = Pop('code')
|
|---|
| 491 | Pop('[[')
|
|---|
| 492 | code_node = ParseCodeNode(tokens)
|
|---|
| 493 | Pop(']]')
|
|---|
| 494 | inner_else_node = ParseElseNode(tokens)
|
|---|
| 495 | return CodeNode([IfNode(ParseExpNode(exp), code_node, inner_else_node)])
|
|---|
| 496 | elif not next.value.strip():
|
|---|
| 497 | Pop('code')
|
|---|
| 498 | return ParseElseNode(tokens)
|
|---|
| 499 | else:
|
|---|
| 500 | return None
|
|---|
| 501 |
|
|---|
| 502 |
|
|---|
| 503 | def ParseAtomicCodeNode(tokens):
|
|---|
| 504 | def Pop(token_type=None):
|
|---|
| 505 | return PopToken(tokens, token_type)
|
|---|
| 506 |
|
|---|
| 507 | head = PopFront(tokens)
|
|---|
| 508 | t = head.token_type
|
|---|
| 509 | if t == 'code':
|
|---|
| 510 | return RawCodeNode(head)
|
|---|
| 511 | elif t == '$var':
|
|---|
| 512 | id_token = Pop('id')
|
|---|
| 513 | Pop('=')
|
|---|
| 514 | next = PeekToken(tokens)
|
|---|
| 515 | if next.token_type == 'exp':
|
|---|
| 516 | exp_token = Pop()
|
|---|
| 517 | return VarNode(id_token, ParseExpNode(exp_token))
|
|---|
| 518 | Pop('[[')
|
|---|
| 519 | code_node = ParseCodeNode(tokens)
|
|---|
| 520 | Pop(']]')
|
|---|
| 521 | return VarNode(id_token, code_node)
|
|---|
| 522 | elif t == '$for':
|
|---|
| 523 | id_token = Pop('id')
|
|---|
| 524 | next_token = PeekToken(tokens)
|
|---|
| 525 | if next_token.token_type == 'code':
|
|---|
| 526 | sep_token = next_token
|
|---|
| 527 | Pop('code')
|
|---|
| 528 | else:
|
|---|
| 529 | sep_token = None
|
|---|
| 530 | Pop('[[')
|
|---|
| 531 | code_node = ParseCodeNode(tokens)
|
|---|
| 532 | Pop(']]')
|
|---|
| 533 | return ForNode(id_token, sep_token, code_node)
|
|---|
| 534 | elif t == '$if':
|
|---|
| 535 | exp_token = Pop('code')
|
|---|
| 536 | Pop('[[')
|
|---|
| 537 | code_node = ParseCodeNode(tokens)
|
|---|
| 538 | Pop(']]')
|
|---|
| 539 | else_node = ParseElseNode(tokens)
|
|---|
| 540 | return IfNode(ParseExpNode(exp_token), code_node, else_node)
|
|---|
| 541 | elif t == '$range':
|
|---|
| 542 | id_token = Pop('id')
|
|---|
| 543 | exp1_token = Pop('exp')
|
|---|
| 544 | Pop('..')
|
|---|
| 545 | exp2_token = Pop('exp')
|
|---|
| 546 | return RangeNode(id_token, ParseExpNode(exp1_token),
|
|---|
| 547 | ParseExpNode(exp2_token))
|
|---|
| 548 | elif t == '$id':
|
|---|
| 549 | return ParseExpNode(Token(head.start + 1, head.end, head.value[1:], 'id'))
|
|---|
| 550 | elif t == '$($)':
|
|---|
| 551 | return LiteralDollarNode(head)
|
|---|
| 552 | elif t == '$':
|
|---|
| 553 | exp_token = Pop('exp')
|
|---|
| 554 | return ParseExpNode(exp_token)
|
|---|
| 555 | elif t == '[[':
|
|---|
| 556 | code_node = ParseCodeNode(tokens)
|
|---|
| 557 | Pop(']]')
|
|---|
| 558 | return code_node
|
|---|
| 559 | else:
|
|---|
| 560 | PushFront(tokens, head)
|
|---|
| 561 | return None
|
|---|
| 562 |
|
|---|
| 563 |
|
|---|
| 564 | def ParseCodeNode(tokens):
|
|---|
| 565 | atomic_code_list = []
|
|---|
| 566 | while True:
|
|---|
| 567 | if not tokens:
|
|---|
| 568 | break
|
|---|
| 569 | atomic_code_node = ParseAtomicCodeNode(tokens)
|
|---|
| 570 | if atomic_code_node:
|
|---|
| 571 | atomic_code_list.append(atomic_code_node)
|
|---|
| 572 | else:
|
|---|
| 573 | break
|
|---|
| 574 | return CodeNode(atomic_code_list)
|
|---|
| 575 |
|
|---|
| 576 |
|
|---|
| 577 | def ParseToAST(pump_src_text):
|
|---|
| 578 | """Convert the given Pump source text into an AST."""
|
|---|
| 579 | tokens = list(Tokenize(pump_src_text))
|
|---|
| 580 | code_node = ParseCodeNode(tokens)
|
|---|
| 581 | return code_node
|
|---|
| 582 |
|
|---|
| 583 |
|
|---|
| 584 | class Env:
|
|---|
| 585 | def __init__(self):
|
|---|
| 586 | self.variables = []
|
|---|
| 587 | self.ranges = []
|
|---|
| 588 |
|
|---|
| 589 | def Clone(self):
|
|---|
| 590 | clone = Env()
|
|---|
| 591 | clone.variables = self.variables[:]
|
|---|
| 592 | clone.ranges = self.ranges[:]
|
|---|
| 593 | return clone
|
|---|
| 594 |
|
|---|
| 595 | def PushVariable(self, var, value):
|
|---|
| 596 | # If value looks like an int, store it as an int.
|
|---|
| 597 | try:
|
|---|
| 598 | int_value = int(value)
|
|---|
| 599 | if ('%s' % int_value) == value:
|
|---|
| 600 | value = int_value
|
|---|
| 601 | except Exception:
|
|---|
| 602 | pass
|
|---|
| 603 | self.variables[:0] = [(var, value)]
|
|---|
| 604 |
|
|---|
| 605 | def PopVariable(self):
|
|---|
| 606 | self.variables[:1] = []
|
|---|
| 607 |
|
|---|
| 608 | def PushRange(self, var, lower, upper):
|
|---|
| 609 | self.ranges[:0] = [(var, lower, upper)]
|
|---|
| 610 |
|
|---|
| 611 | def PopRange(self):
|
|---|
| 612 | self.ranges[:1] = []
|
|---|
| 613 |
|
|---|
| 614 | def GetValue(self, identifier):
|
|---|
| 615 | for (var, value) in self.variables:
|
|---|
| 616 | if identifier == var:
|
|---|
| 617 | return value
|
|---|
| 618 |
|
|---|
| 619 | print 'ERROR: meta variable %s is undefined.' % (identifier,)
|
|---|
| 620 | sys.exit(1)
|
|---|
| 621 |
|
|---|
| 622 | def EvalExp(self, exp):
|
|---|
| 623 | try:
|
|---|
| 624 | result = eval(exp.python_exp)
|
|---|
| 625 | except Exception, e:
|
|---|
| 626 | print 'ERROR: caught exception %s: %s' % (e.__class__.__name__, e)
|
|---|
| 627 | print ('ERROR: failed to evaluate meta expression %s at %s' %
|
|---|
| 628 | (exp.python_exp, exp.token.start))
|
|---|
| 629 | sys.exit(1)
|
|---|
| 630 | return result
|
|---|
| 631 |
|
|---|
| 632 | def GetRange(self, identifier):
|
|---|
| 633 | for (var, lower, upper) in self.ranges:
|
|---|
| 634 | if identifier == var:
|
|---|
| 635 | return (lower, upper)
|
|---|
| 636 |
|
|---|
| 637 | print 'ERROR: range %s is undefined.' % (identifier,)
|
|---|
| 638 | sys.exit(1)
|
|---|
| 639 |
|
|---|
| 640 |
|
|---|
| 641 | class Output:
|
|---|
| 642 | def __init__(self):
|
|---|
| 643 | self.string = ''
|
|---|
| 644 |
|
|---|
| 645 | def GetLastLine(self):
|
|---|
| 646 | index = self.string.rfind('\n')
|
|---|
| 647 | if index < 0:
|
|---|
| 648 | return ''
|
|---|
| 649 |
|
|---|
| 650 | return self.string[index + 1:]
|
|---|
| 651 |
|
|---|
| 652 | def Append(self, s):
|
|---|
| 653 | self.string += s
|
|---|
| 654 |
|
|---|
| 655 |
|
|---|
| 656 | def RunAtomicCode(env, node, output):
|
|---|
| 657 | if isinstance(node, VarNode):
|
|---|
| 658 | identifier = node.identifier.value.strip()
|
|---|
| 659 | result = Output()
|
|---|
| 660 | RunAtomicCode(env.Clone(), node.atomic_code, result)
|
|---|
| 661 | value = result.string
|
|---|
| 662 | env.PushVariable(identifier, value)
|
|---|
| 663 | elif isinstance(node, RangeNode):
|
|---|
| 664 | identifier = node.identifier.value.strip()
|
|---|
| 665 | lower = int(env.EvalExp(node.exp1))
|
|---|
| 666 | upper = int(env.EvalExp(node.exp2))
|
|---|
| 667 | env.PushRange(identifier, lower, upper)
|
|---|
| 668 | elif isinstance(node, ForNode):
|
|---|
| 669 | identifier = node.identifier.value.strip()
|
|---|
| 670 | if node.sep is None:
|
|---|
| 671 | sep = ''
|
|---|
| 672 | else:
|
|---|
| 673 | sep = node.sep.value
|
|---|
| 674 | (lower, upper) = env.GetRange(identifier)
|
|---|
| 675 | for i in range(lower, upper + 1):
|
|---|
| 676 | new_env = env.Clone()
|
|---|
| 677 | new_env.PushVariable(identifier, i)
|
|---|
| 678 | RunCode(new_env, node.code, output)
|
|---|
| 679 | if i != upper:
|
|---|
| 680 | output.Append(sep)
|
|---|
| 681 | elif isinstance(node, RawCodeNode):
|
|---|
| 682 | output.Append(node.raw_code.value)
|
|---|
| 683 | elif isinstance(node, IfNode):
|
|---|
| 684 | cond = env.EvalExp(node.exp)
|
|---|
| 685 | if cond:
|
|---|
| 686 | RunCode(env.Clone(), node.then_branch, output)
|
|---|
| 687 | elif node.else_branch is not None:
|
|---|
| 688 | RunCode(env.Clone(), node.else_branch, output)
|
|---|
| 689 | elif isinstance(node, ExpNode):
|
|---|
| 690 | value = env.EvalExp(node)
|
|---|
| 691 | output.Append('%s' % (value,))
|
|---|
| 692 | elif isinstance(node, LiteralDollarNode):
|
|---|
| 693 | output.Append('$')
|
|---|
| 694 | elif isinstance(node, CodeNode):
|
|---|
| 695 | RunCode(env.Clone(), node, output)
|
|---|
| 696 | else:
|
|---|
| 697 | print 'BAD'
|
|---|
| 698 | print node
|
|---|
| 699 | sys.exit(1)
|
|---|
| 700 |
|
|---|
| 701 |
|
|---|
| 702 | def RunCode(env, code_node, output):
|
|---|
| 703 | for atomic_code in code_node.atomic_code:
|
|---|
| 704 | RunAtomicCode(env, atomic_code, output)
|
|---|
| 705 |
|
|---|
| 706 |
|
|---|
| 707 | def IsSingleLineComment(cur_line):
|
|---|
| 708 | return '//' in cur_line
|
|---|
| 709 |
|
|---|
| 710 |
|
|---|
| 711 | def IsInPreprocessorDirective(prev_lines, cur_line):
|
|---|
| 712 | if cur_line.lstrip().startswith('#'):
|
|---|
| 713 | return True
|
|---|
| 714 | return prev_lines and prev_lines[-1].endswith('\\')
|
|---|
| 715 |
|
|---|
| 716 |
|
|---|
| 717 | def WrapComment(line, output):
|
|---|
| 718 | loc = line.find('//')
|
|---|
| 719 | before_comment = line[:loc].rstrip()
|
|---|
| 720 | if before_comment == '':
|
|---|
| 721 | indent = loc
|
|---|
| 722 | else:
|
|---|
| 723 | output.append(before_comment)
|
|---|
| 724 | indent = len(before_comment) - len(before_comment.lstrip())
|
|---|
| 725 | prefix = indent*' ' + '// '
|
|---|
| 726 | max_len = 80 - len(prefix)
|
|---|
| 727 | comment = line[loc + 2:].strip()
|
|---|
| 728 | segs = [seg for seg in re.split(r'(\w+\W*)', comment) if seg != '']
|
|---|
| 729 | cur_line = ''
|
|---|
| 730 | for seg in segs:
|
|---|
| 731 | if len((cur_line + seg).rstrip()) < max_len:
|
|---|
| 732 | cur_line += seg
|
|---|
| 733 | else:
|
|---|
| 734 | if cur_line.strip() != '':
|
|---|
| 735 | output.append(prefix + cur_line.rstrip())
|
|---|
| 736 | cur_line = seg.lstrip()
|
|---|
| 737 | if cur_line.strip() != '':
|
|---|
| 738 | output.append(prefix + cur_line.strip())
|
|---|
| 739 |
|
|---|
| 740 |
|
|---|
| 741 | def WrapCode(line, line_concat, output):
|
|---|
| 742 | indent = len(line) - len(line.lstrip())
|
|---|
| 743 | prefix = indent*' ' # Prefix of the current line
|
|---|
| 744 | max_len = 80 - indent - len(line_concat) # Maximum length of the current line
|
|---|
| 745 | new_prefix = prefix + 4*' ' # Prefix of a continuation line
|
|---|
| 746 | new_max_len = max_len - 4 # Maximum length of a continuation line
|
|---|
| 747 | # Prefers to wrap a line after a ',' or ';'.
|
|---|
| 748 | segs = [seg for seg in re.split(r'([^,;]+[,;]?)', line.strip()) if seg != '']
|
|---|
| 749 | cur_line = '' # The current line without leading spaces.
|
|---|
| 750 | for seg in segs:
|
|---|
| 751 | # If the line is still too long, wrap at a space.
|
|---|
| 752 | while cur_line == '' and len(seg.strip()) > max_len:
|
|---|
| 753 | seg = seg.lstrip()
|
|---|
| 754 | split_at = seg.rfind(' ', 0, max_len)
|
|---|
| 755 | output.append(prefix + seg[:split_at].strip() + line_concat)
|
|---|
| 756 | seg = seg[split_at + 1:]
|
|---|
| 757 | prefix = new_prefix
|
|---|
| 758 | max_len = new_max_len
|
|---|
| 759 |
|
|---|
| 760 | if len((cur_line + seg).rstrip()) < max_len:
|
|---|
| 761 | cur_line = (cur_line + seg).lstrip()
|
|---|
| 762 | else:
|
|---|
| 763 | output.append(prefix + cur_line.rstrip() + line_concat)
|
|---|
| 764 | prefix = new_prefix
|
|---|
| 765 | max_len = new_max_len
|
|---|
| 766 | cur_line = seg.lstrip()
|
|---|
| 767 | if cur_line.strip() != '':
|
|---|
| 768 | output.append(prefix + cur_line.strip())
|
|---|
| 769 |
|
|---|
| 770 |
|
|---|
| 771 | def WrapPreprocessorDirective(line, output):
|
|---|
| 772 | WrapCode(line, ' \\', output)
|
|---|
| 773 |
|
|---|
| 774 |
|
|---|
| 775 | def WrapPlainCode(line, output):
|
|---|
| 776 | WrapCode(line, '', output)
|
|---|
| 777 |
|
|---|
| 778 |
|
|---|
| 779 | def IsMultiLineIWYUPragma(line):
|
|---|
| 780 | return re.search(r'/\* IWYU pragma: ', line)
|
|---|
| 781 |
|
|---|
| 782 |
|
|---|
| 783 | def IsHeaderGuardIncludeOrOneLineIWYUPragma(line):
|
|---|
| 784 | return (re.match(r'^#(ifndef|define|endif\s*//)\s*[\w_]+\s*$', line) or
|
|---|
| 785 | re.match(r'^#include\s', line) or
|
|---|
| 786 | # Don't break IWYU pragmas, either; that causes iwyu.py problems.
|
|---|
| 787 | re.search(r'// IWYU pragma: ', line))
|
|---|
| 788 |
|
|---|
| 789 |
|
|---|
| 790 | def WrapLongLine(line, output):
|
|---|
| 791 | line = line.rstrip()
|
|---|
| 792 | if len(line) <= 80:
|
|---|
| 793 | output.append(line)
|
|---|
| 794 | elif IsSingleLineComment(line):
|
|---|
| 795 | if IsHeaderGuardIncludeOrOneLineIWYUPragma(line):
|
|---|
| 796 | # The style guide made an exception to allow long header guard lines,
|
|---|
| 797 | # includes and IWYU pragmas.
|
|---|
| 798 | output.append(line)
|
|---|
| 799 | else:
|
|---|
| 800 | WrapComment(line, output)
|
|---|
| 801 | elif IsInPreprocessorDirective(output, line):
|
|---|
| 802 | if IsHeaderGuardIncludeOrOneLineIWYUPragma(line):
|
|---|
| 803 | # The style guide made an exception to allow long header guard lines,
|
|---|
| 804 | # includes and IWYU pragmas.
|
|---|
| 805 | output.append(line)
|
|---|
| 806 | else:
|
|---|
| 807 | WrapPreprocessorDirective(line, output)
|
|---|
| 808 | elif IsMultiLineIWYUPragma(line):
|
|---|
| 809 | output.append(line)
|
|---|
| 810 | else:
|
|---|
| 811 | WrapPlainCode(line, output)
|
|---|
| 812 |
|
|---|
| 813 |
|
|---|
| 814 | def BeautifyCode(string):
|
|---|
| 815 | lines = string.splitlines()
|
|---|
| 816 | output = []
|
|---|
| 817 | for line in lines:
|
|---|
| 818 | WrapLongLine(line, output)
|
|---|
| 819 | output2 = [line.rstrip() for line in output]
|
|---|
| 820 | return '\n'.join(output2) + '\n'
|
|---|
| 821 |
|
|---|
| 822 |
|
|---|
| 823 | def ConvertFromPumpSource(src_text):
|
|---|
| 824 | """Return the text generated from the given Pump source text."""
|
|---|
| 825 | ast = ParseToAST(StripMetaComments(src_text))
|
|---|
| 826 | output = Output()
|
|---|
| 827 | RunCode(Env(), ast, output)
|
|---|
| 828 | return BeautifyCode(output.string)
|
|---|
| 829 |
|
|---|
| 830 |
|
|---|
| 831 | def main(argv):
|
|---|
| 832 | if len(argv) == 1:
|
|---|
| 833 | print __doc__
|
|---|
| 834 | sys.exit(1)
|
|---|
| 835 |
|
|---|
| 836 | file_path = argv[-1]
|
|---|
| 837 | output_str = ConvertFromPumpSource(file(file_path, 'r').read())
|
|---|
| 838 | if file_path.endswith('.pump'):
|
|---|
| 839 | output_file_path = file_path[:-5]
|
|---|
| 840 | else:
|
|---|
| 841 | output_file_path = '-'
|
|---|
| 842 | if output_file_path == '-':
|
|---|
| 843 | print output_str,
|
|---|
| 844 | else:
|
|---|
| 845 | output_file = file(output_file_path, 'w')
|
|---|
| 846 | output_file.write('// This file was GENERATED by command:\n')
|
|---|
| 847 | output_file.write('// %s %s\n' %
|
|---|
| 848 | (os.path.basename(__file__), os.path.basename(file_path)))
|
|---|
| 849 | output_file.write('// DO NOT EDIT BY HAND!!!\n\n')
|
|---|
| 850 | output_file.write(output_str)
|
|---|
| 851 | output_file.close()
|
|---|
| 852 |
|
|---|
| 853 |
|
|---|
| 854 | if __name__ == '__main__':
|
|---|
| 855 | main(sys.argv)
|
|---|
