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Extract generated blob check into its own module

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This commit is contained in:
Joshua Peek
2012-08-03 15:47:50 -05:00
parent 4531103033
commit 41b7d13aa7
3 changed files with 165 additions and 129 deletions
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1
lib/linguist.rb
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@@ -1,4 +1,5 @@
require 'linguist/blob_helper'
require 'linguist/generated'
require 'linguist/language'
require 'linguist/mime'
require 'linguist/repository'

132
lib/linguist/blob_helper.rb
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@@ -1,4 +1,5 @@
require 'linguist/classifier'
require 'linguist/generated'
require 'linguist/language'
require 'linguist/mime'
require 'linguist/samples'
@@ -212,143 +213,16 @@ module Linguist
lines.grep(/\S/).size
end
# Internal: Compute average line length.
#
# Returns Integer.
def average_line_length
if lines.any?
lines.inject(0) { |n, l| n += l.length } / lines.length
else
0
end
end
# Public: Is the blob a generated file?
#
# Generated source code is supressed in diffs and is ignored by
# language statistics.
#
# Requires Blob#data
#
# Includes:
# - XCode project XML files
# - Minified JavaScript
# - Compiled CoffeeScript
# - PEG.js-generated parsers
#
# Please add additional test coverage to
# `test/test_blob.rb#test_generated` if you make any changes.
# May load Blob#data
#
# Return true or false
def generated?
if name == 'Gemfile.lock' || minified_javascript? || compiled_coffeescript? ||
xcode_project_file? || generated_net_docfile? || generated_parser?
true
else
false
end
end
# Internal: Is the blob an XCode project file?
#
# Generated if the file extension is an XCode project
# file extension.
#
# Returns true of false.
def xcode_project_file?
['.xib', '.nib', '.storyboard', '.pbxproj', '.xcworkspacedata', '.xcuserstate'].include?(extname)
end
# Internal: Is the blob minified JS?
#
# Consider JS minified if the average line length is
# greater then 100c.
#
# Returns true or false.
def minified_javascript?
return unless extname == '.js'
average_line_length > 100
end
# Internal: Is the blob of JS a parser generated by PEG.js?
#
# Requires Blob#data
#
# PEG.js-generated parsers are not meant to be consumed by humans.
#
# Return true or false
def generated_parser?
return false unless extname == '.js'
# PEG.js-generated parsers include a comment near the top of the file
# that marks them as such.
if lines[0..4].join('') =~ /^(?:[^\/]|\/[^\*])*\/\*(?:[^\*]|\*[^\/])*Generated by PEG.js/
return true
end
false
end
# Internal: Is the blob of JS generated by CoffeeScript?
#
# Requires Blob#data
#
# CoffeScript is meant to output JS that would be difficult to
# tell if it was generated or not. Look for a number of patterns
# output by the CS compiler.
#
# Return true or false
def compiled_coffeescript?
return false unless extname == '.js'
# CoffeeScript generated by > 1.2 include a comment on the first line
if lines[0] =~ /^\/\/ Generated by /
return true
end
if lines[0] == '(function() {' && # First line is module closure opening
lines[-2] == '}).call(this);' && # Second to last line closes module closure
lines[-1] == '' # Last line is blank
score = 0
lines.each do |line|
if line =~ /var /
# Underscored temp vars are likely to be Coffee
score += 1 * line.gsub(/(_fn|_i|_len|_ref|_results)/).count
# bind and extend functions are very Coffee specific
score += 3 * line.gsub(/(__bind|__extends|__hasProp|__indexOf|__slice)/).count
end
end
# Require a score of 3. This is fairly arbitrary. Consider
# tweaking later.
score >= 3
else
false
end
end
# Internal: Is this a generated documentation file for a .NET assembly?
#
# Requires Blob#data
#
# .NET developers often check in the XML Intellisense file along with an
# assembly - however, these don't have a special extension, so we have to
# dig into the contents to determine if it's a docfile. Luckily, these files
# are extremely structured, so recognizing them is easy.
#
# Returns true or false
def generated_net_docfile?
return false unless extname.downcase == ".xml"
return false unless lines.count > 3
# .NET Docfiles always open with <doc> and their first tag is an
# <assembly> tag
return lines[1].include?("<doc>") &&
lines[2].include?("<assembly>") &&
lines[-2].include?("</doc>")
@_generated ||= Generated.generated?(name, lambda { data })
end
# Public: Should the blob be indexed for searching?

161
lib/linguist/generated.rb Normal file
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@@ -0,0 +1,161 @@
module Linguist
class Generated
# Public: Is the blob a generated file?
#
# name - String filename
# data - String blob data. A block also maybe passed in for lazy
# loading. This behavior is deprecated and you should always
# pass in a String.
#
# Return true or false
def self.generated?(name, data)
new(name, data).generated?
end
# Internal: Initialize Generated instance
#
# name - String filename
# data - String blob data
def initialize(name, data)
@name = name
@extname = File.extname(name)
@_data = data
end
attr_reader :name, :extname
# Lazy load blob data if block was passed in.
#
# Awful, awful stuff happening here.
#
# Returns String data.
def data
@data ||= @_data.respond_to?(:call) ? @_data.call() : @_data
end
# Public: Get each line of data
#
# Returns an Array of lines
def lines
@lines ||= data.split("\n", -1)
end
# Internal: Is the blob a generated file?
#
# Generated source code is supressed in diffs and is ignored by
# language statistics.
#
# Please add additional test coverage to
# `test/test_blob.rb#test_generated` if you make any changes.
#
# Return true or false
def generated?
name == 'Gemfile.lock' ||
minified_javascript? ||
compiled_coffeescript? ||
xcode_project_file? ||
generated_net_docfile? ||
generated_parser?
end
# Internal: Is the blob an XCode project file?
#
# Generated if the file extension is an XCode project
# file extension.
#
# Returns true of false.
def xcode_project_file?
['.xib', '.nib', '.storyboard', '.pbxproj', '.xcworkspacedata', '.xcuserstate'].include?(extname)
end
# Internal: Is the blob minified JS?
#
# Consider JS minified if the average line length is
# greater then 100c.
#
# Returns true or false.
def minified_javascript?
return unless extname == '.js'
if lines.any?
(lines.inject(0) { |n, l| n += l.length } / lines.length) > 100
else
false
end
end
# Internal: Is the blob of JS generated by CoffeeScript?
#
# CoffeScript is meant to output JS that would be difficult to
# tell if it was generated or not. Look for a number of patterns
# output by the CS compiler.
#
# Return true or false
def compiled_coffeescript?
return false unless extname == '.js'
# CoffeeScript generated by > 1.2 include a comment on the first line
if lines[0] =~ /^\/\/ Generated by /
return true
end
if lines[0] == '(function() {' && # First line is module closure opening
lines[-2] == '}).call(this);' && # Second to last line closes module closure
lines[-1] == '' # Last line is blank
score = 0
lines.each do |line|
if line =~ /var /
# Underscored temp vars are likely to be Coffee
score += 1 * line.gsub(/(_fn|_i|_len|_ref|_results)/).count
# bind and extend functions are very Coffee specific
score += 3 * line.gsub(/(__bind|__extends|__hasProp|__indexOf|__slice)/).count
end
end
# Require a score of 3. This is fairly arbitrary. Consider
# tweaking later.
score >= 3
else
false
end
end
# Internal: Is this a generated documentation file for a .NET assembly?
#
# .NET developers often check in the XML Intellisense file along with an
# assembly - however, these don't have a special extension, so we have to
# dig into the contents to determine if it's a docfile. Luckily, these files
# are extremely structured, so recognizing them is easy.
#
# Returns true or false
def generated_net_docfile?
return false unless extname.downcase == ".xml"
return false unless lines.count > 3
# .NET Docfiles always open with <doc> and their first tag is an
# <assembly> tag
return lines[1].include?("<doc>") &&
lines[2].include?("<assembly>") &&
lines[-2].include?("</doc>")
end
# Internal: Is the blob of JS a parser generated by PEG.js?
#
# PEG.js-generated parsers are not meant to be consumed by humans.
#
# Return true or false
def generated_parser?
return false unless extname == '.js'
# PEG.js-generated parsers include a comment near the top of the file
# that marks them as such.
if lines[0..4].join('') =~ /^(?:[^\/]|\/[^\*])*\/\*(?:[^\*]|\*[^\/])*Generated by PEG.js/
return true
end
false
end
end
end