1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
require "pathname"
require "active_support/core_ext/class"
require "action_view/template"
module ActionView
# = Action View Resolver
class Resolver
cattr_accessor :caching
self.caching = true
class << self
alias :caching? :caching
end
def initialize
@cached = Hash.new { |h1,k1| h1[k1] = Hash.new { |h2,k2|
h2[k2] = Hash.new { |h3,k3| h3[k3] = Hash.new { |h4,k4| h4[k4] = {} } } } }
end
def clear_cache
@cached.clear
end
# Normalizes the arguments and passes it on to find_template.
def find_all(name, prefix=nil, partial=false, details={}, key=nil, locals=[])
cached(key, [name, prefix, partial], details, locals) do
find_templates(name, prefix, partial, details)
end
end
private
delegate :caching?, :to => "self.class"
# This is what child classes implement. No defaults are needed
# because Resolver guarantees that the arguments are present and
# normalized.
def find_templates(name, prefix, partial, details)
raise NotImplementedError, "Subclasses must implement a find_templates(name, prefix, partial, details) method"
end
# Helpers that builds a path. Useful for building virtual paths.
def build_path(name, prefix, partial)
path = ""
path << "#{prefix}/" unless prefix.empty?
path << (partial ? "_#{name}" : name)
path
end
# Handles templates caching. If a key is given and caching is on
# always check the cache before hitting the resolver. Otherwise,
# it always hits the resolver but check if the resolver is fresher
# before returning it.
def cached(key, path_info, details, locals) #:nodoc:
name, prefix, partial = path_info
locals = sort_locals(locals)
if key && caching?
@cached[key][name][prefix][partial][locals] ||= decorate(yield, path_info, details, locals)
else
fresh = decorate(yield, path_info, details, locals)
return fresh unless key
scope = @cached[key][name][prefix][partial]
cache = scope[locals]
mtime = cache && cache.map(&:updated_at).max
if !mtime || fresh.empty? || fresh.any? { |t| t.updated_at > mtime }
scope[locals] = fresh
else
cache
end
end
end
# Ensures all the resolver information is set in the template.
def decorate(templates, path_info, details, locals) #:nodoc:
cached = nil
templates.each do |t|
t.locals = locals
t.formats = details[:formats] || [:html] if t.formats.empty?
t.virtual_path ||= (cached ||= build_path(*path_info))
end
end
if :symbol.respond_to?("<=>")
def sort_locals(locals) #:nodoc:
locals.sort.freeze
end
else
def sort_locals(locals) #:nodoc:
locals = locals.map{ |l| l.to_s }
locals.sort!
locals.freeze
end
end
end
class PathResolver < Resolver
EXTENSION_ORDER = [:locale, :formats, :handlers]
private
def find_templates(name, prefix, partial, details)
path = build_path(name, prefix, partial)
query(path, EXTENSION_ORDER.map { |ext| details[ext] }, details[:formats])
end
def query(path, exts, formats)
query = File.join(@path, path)
query << exts.map { |ext|
"{#{ext.compact.map { |e| ".#{e}" }.join(',')},}"
}.join
query.gsub!(/\{\.html,/, "{.html,.text.html,")
query.gsub!(/\{\.text,/, "{.text,.text.plain,")
templates = []
sanitizer = Hash.new { |h,k| h[k] = Dir["#{File.dirname(k)}/*"] }
Dir[query].each do |p|
next if File.directory?(p) || !sanitizer[p].include?(p)
handler, format = extract_handler_and_format(p, formats)
contents = File.open(p, "rb") {|io| io.read }
templates << Template.new(contents, File.expand_path(p), handler,
:virtual_path => path, :format => format, :updated_at => mtime(p))
end
templates
end
# Returns the file mtime from the filesystem.
def mtime(p)
File.stat(p).mtime
end
# Extract handler and formats from path. If a format cannot be a found neither
# from the path, or the handler, we should return the array of formats given
# to the resolver.
def extract_handler_and_format(path, default_formats)
pieces = File.basename(path).split(".")
pieces.shift
handler = Template.handler_for_extension(pieces.pop)
format = pieces.last && Mime[pieces.last]
[handler, format]
end
end
# A resolver that loads files from the filesystem.
class FileSystemResolver < PathResolver
def initialize(path)
raise ArgumentError, "path already is a Resolver class" if path.is_a?(Resolver)
super()
@path = File.expand_path(path)
end
def to_s
@path.to_s
end
alias :to_path :to_s
def eql?(resolver)
self.class.equal?(resolver.class) && to_path == resolver.to_path
end
alias :== :eql?
end
# The same as FileSystemResolver but does not allow templates to store
# a virtual path since it is invalid for such resolvers.
class FallbackFileSystemResolver < FileSystemResolver
def self.instances
[new(""), new("/")]
end
def decorate(*)
super.each { |t| t.virtual_path = nil }
end
end
end
|
