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#!/usr/bin/ruby
#
# Find unused resources in all the apps found recursively under the current directory
# Usage:
# find_unused_resources.rb [-html]
#
# If -html is specified, the output will be HTML, otherwise it will be plain text
#
# Author: cbeust@google.com
require 'find'
debug = false
@@stringIdPattern = Regexp.new("name=\"([@_a-zA-Z0-9 ]*)\"")
@@layoutIdPattern = Regexp.new("android:id=\".*id/([_a-zA-Z0-9]*)\"")
@@stringXmlPatterns = [
Regexp.new("@string/([_a-zA-Z0-9]*)"),
Regexp.new("@array/([_a-zA-Z0-9]*)"),
]
@@javaIdPatterns = [
Regexp.new("R.id.([_a-zA-Z0-9]+)"),
Regexp.new("R.string.([_a-zA-Z0-9]+)"),
Regexp.new("R.array.([_a-zA-Z0-9]+)"),
Regexp.new("R.color.([_a-zA-Z0-9]+)"),
Regexp.new("R.configVarying.([_a-zA-Z0-9]+)"),
Regexp.new("R.dimen.([_a-zA-Z0-9]+)"),
]
@@appDir = "partner/google/apps/Gmail"
def findResDirectories(root)
result = Array.new
Find.find(root) do |path|
if FileTest.directory?(path)
if File.basename(path) == "res"
result << path
else
next
end
end
end
result
end
class UnusedResources
attr_accessor :appDir, :unusedLayoutIds, :unusedStringIds
end
class FilePosition
attr_accessor :file, :lineNumber
def initialize(f, ln)
@file = f
@lineNumber = ln
end
def to_s
"#{file}:#{lineNumber}"
end
def <=>(other)
if @file == other.file
@lineNumber - other.lineNumber
else
@file <=> other.file
end
end
end
def findAllOccurrences(re, string)
result = Array.new
s = string
matchData = re.match(s)
while (matchData)
result << matchData[1].to_s
s = s[matchData.end(1) .. -1]
matchData = re.match(s)
end
result
end
@@globalJavaIdUses = Hash.new
def recordJavaUses(glob)
Dir.glob(glob).each { |filename|
File.open(filename) { |file|
file.each { |line|
@@javaIdPatterns.each { |re|
findAllOccurrences(re, line).each { |id|
@@globalJavaIdUses[id] = FilePosition.new(filename, file.lineno)
}
}
}
}
}
end
def findUnusedResources(dir)
javaIdUses = Hash.new
layouts = Hash.new
strings = Hash.new
xmlIdUses = Hash.new
Dir.glob("#{dir}/res/**/*.xml").each { |filename|
if ! (filename =~ /attrs.xml$/)
File.open(filename) { |file|
file.each { |line|
findAllOccurrences(@@stringIdPattern, line).each {|id|
strings[id] = FilePosition.new(filename, file.lineno)
}
findAllOccurrences(@@layoutIdPattern, line).each {|id|
layouts[id] = FilePosition.new(filename, file.lineno)
}
@@stringXmlPatterns.each { |re|
findAllOccurrences(re, line).each {|id|
xmlIdUses[id] = FilePosition.new(filename, file.lineno)
}
}
}
}
end
}
Dir.glob("#{dir}/AndroidManifest.xml").each { |filename|
File.open(filename) { |file|
file.each { |line|
@@stringXmlPatterns.each { |re|
findAllOccurrences(re, line).each {|id|
xmlIdUses[id] = FilePosition.new(filename, file.lineno)
}
}
}
}
}
recordJavaUses("#{dir}/src/**/*.java")
@@globalJavaIdUses.each_pair { |id, file|
layouts.delete(id)
strings.delete(id)
}
javaIdUses.each_pair { |id, file|
layouts.delete(id)
strings.delete(id)
}
xmlIdUses.each_pair { |id, file|
layouts.delete(id)
strings.delete(id)
}
result = UnusedResources.new
result.appDir = dir
result.unusedLayoutIds = layouts
result.unusedStringIds = strings
result
end
def findApps(dir)
result = Array.new
Dir.glob("#{dir}/**/res").each { |filename|
a = filename.split("/")
result << a.slice(0, a.size-1).join("/")
}
result
end
def displayText(result)
result.each { |unusedResources|
puts "=== #{unusedResources.appDir}"
puts "----- Unused layout ids"
unusedResources.unusedLayoutIds.sort { |id, file| id[1] <=> file[1] }.each {|f|
puts " #{f[0]} #{f[1]}"
}
puts "----- Unused string ids"
unusedResources.unusedStringIds.sort { |id, file| id[1] <=> file[1] }.each {|f|
puts " #{f[0]} #{f[1]}"
}
}
end
def displayHtmlUnused(unusedResourceIds, title)
puts "<h3>#{title}</h3>"
puts "<table border='1'>"
unusedResourceIds.sort { |id, file| id[1] <=> file[1] }.each {|f|
puts "<tr><td><b>#{f[0]}</b></td> <td>#{f[1]}</td></tr>"
}
puts "</table>"
end
def displayHtml(result)
title = "Unused resources as of #{Time.now.localtime}"
puts "<html><header><title>#{title}</title></header><body>"
puts "<h1><p align=\"center\">#{title}</p></h1>"
result.each { |unusedResources|
puts "<h2>#{unusedResources.appDir}</h2>"
displayHtmlUnused(unusedResources.unusedLayoutIds, "Unused layout ids")
displayHtmlUnused(unusedResources.unusedStringIds, "Unused other ids")
}
puts "</body>"
end
result = Array.new
recordJavaUses("java/android/**/*.java")
if debug
result << findUnusedResources("apps/Browser")
else
findApps(".").each { |appDir|
result << findUnusedResources(appDir)
}
end
if ARGV[0] == "-html"
displayHtml result
else
displayText result
end
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