迁移到Rails 5.0后，带有favicon_tag的意外缩进错误 [英] unexpected indentation error with favicon_tag after migration to rails 5.0

问题描述

有了HAML部分

!!!
%html
    %head
        %title=document_title 
        = favicon_link_tag 'logo16.png'
        %meta{content: form_authenticity_token, name: "csrf-token"}= ''
        ... 

我得到了错误

SyntaxError: [stdin]:68:1: unexpected indentation

所以我玩了一些错误的身份证明；然后我得到其他但正确的错误

So I played a bit with wrong Identation; then I get other but correct errors

Inconsistent indentation: "\t\t " used for indentation, but the rest of the document was indented using 1 tab.
Inconsistent indentation: "\t " used for indentation, but the rest of the document was indented using 1 tab.
Illegal nesting: content can't be both given on the same line as %title and nested within it.

和堆栈跟踪看起来像

app/views/layouts/page_print.html.haml:5
haml (4.0.7) lib/haml/parser.rb:174:in `block in tabs'  

，但是使用unexpected Indentation，我得到一个有趣的堆栈-其中的coffee_script是什么?:

but with the unexpected Indentation I get an interesting stack - what does the coffee_script there?:

compile (C:\Users\halfbit\AppData\Local\Temp\execjs20161121-7752-txwa8bjs:6692:19)
eval (<anonymous>:1:10)
C:\Users\halfbit\AppData\Local\Temp\execjs20161121-7752-txwa8bjs:6703:8
C:\Users\halfbit\AppData\Local\Temp\execjs20161121-7752-txwa8bjs:6709:14
require./helpers.exports (C:\Users\halfbit\AppData\Local\Temp\execjs20161121-7752-txwa8bjs:1:102)
Object.<anonymous> (C:\Users\halfbit\AppData\Local\Temp\execjs20161121-7752-txwa8bjs:1:120)
Module._compile (module.js:409:26)
Object.Module._extensions..js (module.js:416:10)
Module.load (module.js:343:32)
Function.Module._load (module.js:300:12)
Function.Module.runMain (module.js:441:10)
startup (node.js:139:18)
node.js:968:3
execjs (2.7.0) lib/execjs/external_runtime.rb:39:in `exec'
execjs (2.7.0) lib/execjs/external_runtime.rb:21:in `eval'
execjs (2.7.0) lib/execjs/external_runtime.rb:46:in `call'
coffee-script (2.4.1) lib/coffee_script.rb:78:in `compile'
sprockets (3.7.0) lib/sprockets/coffee_script_processor.rb:21:in `block in call'
sprockets (3.7.0) lib/sprockets/cache.rb:85:in `fetch'
sprockets (3.7.0) lib/sprockets/coffee_script_processor.rb:20:in `call'
sprockets (3.7.0) lib/sprockets/processor_utils.rb:75:in `call_processor'
sprockets (3.7.0) lib/sprockets/processor_utils.rb:57:in `block in call_processors'
sprockets (3.7.0) lib/sprockets/processor_utils.rb:56:in `reverse_each'
sprockets (3.7.0) lib/sprockets/processor_utils.rb:56:in `call_processors'
sprockets (3.7.0) lib/sprockets/loader.rb:134:in `load_from_unloaded'
sprockets (3.7.0) lib/sprockets/loader.rb:60:in `block in load'
sprockets (3.7.0) lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
sprockets (3.7.0) lib/sprockets/loader.rb:44:in `load'
sprockets (3.7.0) lib/sprockets/cached_environment.rb:20:in `block in initialize'
sprockets (3.7.0) lib/sprockets/cached_environment.rb:47:in `load'
sprockets (3.7.0) lib/sprockets/bundle.rb:23:in `block in call'
sprockets (3.7.0) lib/sprockets/utils.rb:196:in `dfs'
sprockets (3.7.0) lib/sprockets/bundle.rb:24:in `call'
sprockets (3.7.0) lib/sprockets/processor_utils.rb:75:in `call_processor'
sprockets (3.7.0) lib/sprockets/processor_utils.rb:57:in `block in call_processors'
sprockets (3.7.0) lib/sprockets/processor_utils.rb:56:in `reverse_each'
sprockets (3.7.0) lib/sprockets/processor_utils.rb:56:in `call_processors'
sprockets (3.7.0) lib/sprockets/loader.rb:134:in `load_from_unloaded'
sprockets (3.7.0) lib/sprockets/loader.rb:60:in `block in load'
sprockets (3.7.0) lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
sprockets (3.7.0) lib/sprockets/loader.rb:44:in `load'
sprockets (3.7.0) lib/sprockets/cached_environment.rb:20:in `block in initialize'
sprockets (3.7.0) lib/sprockets/cached_environment.rb:47:in `load'
sprockets (3.7.0) lib/sprockets/base.rb:66:in `find_asset'
sprockets (3.7.0) lib/sprockets/base.rb:73:in `find_all_linked_assets'
sprockets (3.7.0) lib/sprockets/manifest.rb:142:in `block in find'
sprockets (3.7.0) lib/sprockets/legacy.rb:114:in `block (2 levels) in logical_paths'
sprockets (3.7.0) lib/sprockets/path_utils.rb:228:in `block in stat_tree'
sprockets (3.7.0) lib/sprockets/path_utils.rb:212:in `block in stat_directory'
sprockets (3.7.0) lib/sprockets/path_utils.rb:209:in `each'
sprockets (3.7.0) lib/sprockets/path_utils.rb:209:in `stat_directory'
sprockets (3.7.0) lib/sprockets/path_utils.rb:227:in `stat_tree'
sprockets (3.7.0) lib/sprockets/legacy.rb:105:in `each'
sprockets (3.7.0) lib/sprockets/legacy.rb:105:in `block in logical_paths'
sprockets (3.7.0) lib/sprockets/legacy.rb:104:in `each'
sprockets (3.7.0) lib/sprockets/legacy.rb:104:in `logical_paths'
sprockets (3.7.0) lib/sprockets/manifest.rb:140:in `find'
sprockets-rails (3.2.0) lib/sprockets/railtie.rb:50:in `each'
sprockets-rails (3.2.0) lib/sprockets/railtie.rb:50:in `map'
sprockets-rails (3.2.0) lib/sprockets/railtie.rb:50:in `precompiled_assets'
sprockets-rails (3.2.0) lib/sprockets/railtie.rb:35:in `asset_precompiled?'
sprockets-rails (3.2.0) lib/sprockets/railtie.rb:251:in `block (3 levels) in <class:Railtie>'
sprockets-rails (3.2.0) lib/sprockets/rails/helper.rb:359:in `precompiled?'
sprockets-rails (3.2.0) lib/sprockets/rails/helper.rb:363:in `raise_unless_precompiled_asset'
sprockets-rails (3.2.0) lib/sprockets/rails/helper.rb:337:in `digest_path'
sprockets-rails (3.2.0) lib/sprockets/rails/helper.rb:325:in `asset_path'
sprockets-rails (3.2.0) lib/sprockets/rails/helper.rb:102:in `block in resolve_asset_path'
sprockets-rails (3.2.0) lib/sprockets/rails/helper.rb:242:in `block in resolve_asset'
sprockets-rails (3.2.0) lib/sprockets/rails/helper.rb:241:in `each'
sprockets-rails (3.2.0) lib/sprockets/rails/helper.rb:241:in `detect'
sprockets-rails (3.2.0) lib/sprockets/rails/helper.rb:241:in `resolve_asset'
sprockets-rails (3.2.0) lib/sprockets/rails/helper.rb:101:in `resolve_asset_path'
sprockets-rails (3.2.0) lib/sprockets/rails/helper.rb:79:in `compute_asset_path'
actionview (5.0.0.1) lib/action_view/helpers/asset_url_helper.rb:144:in `asset_path'
actionview (5.0.0.1) lib/action_view/helpers/asset_url_helper.rb:311:in `image_path'
actionview (5.0.0.1) lib/action_view/helpers/asset_tag_helper.rb:176:in `favicon_link_tag'
app/views/layouts/page_print.html.haml:5:in `_app_views_layouts_page_print_html_haml___1809589845_126062940'    

评论

#= favicon_link_tag 'logo16.png'

没有错误

有什么想法吗?

推荐答案

我做到了，我再次调试了Rails-我讨厌这样做.

I did it, I again debugged Rails - I hate to do this.

解决方案"或更好的解释是:

The "solution" or better the explanations are:

1.) Sprockets behaves completely different in Rails 5.0 that in Rails 3.2
2.) Sprockets reads and caches the whole assets path with first touch (favicon in this case)
3.) As far as I can see Sprockets tries to (coffee-) compile manifest.js (?)
4.) Any compile error is catched (rescued) to late (I would say in HAML in this case) 
5.) Its therefor extremely misleading to get a - coffeescript indentation error pointing to .HAML or .RB file  

我做了什么?

在Sprockes::path_utlis中，我更改/添加了开始/救援:

In Sprockes::path_utlis I changed/added a begin/rescue:

# Public: Stat all the files under a directory.
#
# dir - A String directory
#
# Returns an Enumerator of [path, stat].
def stat_directory(dir)
  return to_enum(__method__, dir) unless block_given?

  self.entries(dir).each do |entry|
    path = File.join(dir, entry)
    # puts path.to_s
    begin
    if stat = self.stat(path)
      yield path, stat
    end
    rescue => e
      puts "error #{e} in: "+path
    end
  end       

我得到的输出:

error SyntaxError: [stdin]:68:1: unexpected indentation in: C:/rbstart/app/assets/javascripts/application.js
error Undefined variable: "$std_width". in: C:/rbstart/app/assets/stylesheets/application.css

由于缓存错误并不总是会重现.

Because of caching the error is not always to reproduce.

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