1#!/usr/bin/env python 2 3# Copyright (c) 2012 Google Inc. All rights reserved. 4# Use of this source code is governed by a BSD-style license that can be 5# found in the LICENSE file. 6 7"""Pretty-prints the contents of a GYP file.""" 8 9from __future__ import print_function 10 11import sys 12import re 13 14 15# Regex to remove comments when we're counting braces. 16COMMENT_RE = re.compile(r"\s*#.*") 17 18# Regex to remove quoted strings when we're counting braces. 19# It takes into account quoted quotes, and makes sure that the quotes match. 20# NOTE: It does not handle quotes that span more than one line, or 21# cases where an escaped quote is preceded by an escaped backslash. 22QUOTE_RE_STR = r'(?P<q>[\'"])(.*?)(?<![^\\][\\])(?P=q)' 23QUOTE_RE = re.compile(QUOTE_RE_STR) 24 25 26def comment_replace(matchobj): 27 return matchobj.group(1) + matchobj.group(2) + "#" * len(matchobj.group(3)) 28 29 30def mask_comments(input): 31 """Mask the quoted strings so we skip braces inside quoted strings.""" 32 search_re = re.compile(r"(.*?)(#)(.*)") 33 return [search_re.sub(comment_replace, line) for line in input] 34 35 36def quote_replace(matchobj): 37 return "%s%s%s%s" % ( 38 matchobj.group(1), 39 matchobj.group(2), 40 "x" * len(matchobj.group(3)), 41 matchobj.group(2), 42 ) 43 44 45def mask_quotes(input): 46 """Mask the quoted strings so we skip braces inside quoted strings.""" 47 search_re = re.compile(r"(.*?)" + QUOTE_RE_STR) 48 return [search_re.sub(quote_replace, line) for line in input] 49 50 51def do_split(input, masked_input, search_re): 52 output = [] 53 mask_output = [] 54 for (line, masked_line) in zip(input, masked_input): 55 m = search_re.match(masked_line) 56 while m: 57 split = len(m.group(1)) 58 line = line[:split] + r"\n" + line[split:] 59 masked_line = masked_line[:split] + r"\n" + masked_line[split:] 60 m = search_re.match(masked_line) 61 output.extend(line.split(r"\n")) 62 mask_output.extend(masked_line.split(r"\n")) 63 return (output, mask_output) 64 65 66def split_double_braces(input): 67 """Masks out the quotes and comments, and then splits appropriate 68 lines (lines that matche the double_*_brace re's above) before 69 indenting them below. 70 71 These are used to split lines which have multiple braces on them, so 72 that the indentation looks prettier when all laid out (e.g. closing 73 braces make a nice diagonal line). 74 """ 75 double_open_brace_re = re.compile(r"(.*?[\[\{\(,])(\s*)([\[\{\(])") 76 double_close_brace_re = re.compile(r"(.*?[\]\}\)],?)(\s*)([\]\}\)])") 77 78 masked_input = mask_quotes(input) 79 masked_input = mask_comments(masked_input) 80 81 (output, mask_output) = do_split(input, masked_input, double_open_brace_re) 82 (output, mask_output) = do_split(output, mask_output, double_close_brace_re) 83 84 return output 85 86 87def count_braces(line): 88 """keeps track of the number of braces on a given line and returns the result. 89 90 It starts at zero and subtracts for closed braces, and adds for open braces. 91 """ 92 open_braces = ["[", "(", "{"] 93 close_braces = ["]", ")", "}"] 94 closing_prefix_re = re.compile(r"(.*?[^\s\]\}\)]+.*?)([\]\}\)],?)\s*$") 95 cnt = 0 96 stripline = COMMENT_RE.sub(r"", line) 97 stripline = QUOTE_RE.sub(r"''", stripline) 98 for char in stripline: 99 for brace in open_braces: 100 if char == brace: 101 cnt += 1 102 for brace in close_braces: 103 if char == brace: 104 cnt -= 1 105 106 after = False 107 if cnt > 0: 108 after = True 109 110 # This catches the special case of a closing brace having something 111 # other than just whitespace ahead of it -- we don't want to 112 # unindent that until after this line is printed so it stays with 113 # the previous indentation level. 114 if cnt < 0 and closing_prefix_re.match(stripline): 115 after = True 116 return (cnt, after) 117 118 119def prettyprint_input(lines): 120 """Does the main work of indenting the input based on the brace counts.""" 121 indent = 0 122 basic_offset = 2 123 for line in lines: 124 if COMMENT_RE.match(line): 125 print(line) 126 else: 127 line = line.strip("\r\n\t ") # Otherwise doesn't strip \r on Unix. 128 if len(line) > 0: 129 (brace_diff, after) = count_braces(line) 130 if brace_diff != 0: 131 if after: 132 print(" " * (basic_offset * indent) + line) 133 indent += brace_diff 134 else: 135 indent += brace_diff 136 print(" " * (basic_offset * indent) + line) 137 else: 138 print(" " * (basic_offset * indent) + line) 139 else: 140 print("") 141 142 143def main(): 144 if len(sys.argv) > 1: 145 data = open(sys.argv[1]).read().splitlines() 146 else: 147 data = sys.stdin.read().splitlines() 148 # Split up the double braces. 149 lines = split_double_braces(data) 150 151 # Indent and print the output. 152 prettyprint_input(lines) 153 return 0 154 155 156if __name__ == "__main__": 157 sys.exit(main()) 158