Transform deprecated shadow DOM selectors in StyleManager

src/styles-element.coffee

@@ -1,9 +1,4 @@
 {Emitter, CompositeDisposable} = require 'event-kit'
-selectorProcessor = require 'postcss-selector-parser'
-SPATIAL_DECORATIONS = new Set([
-  'invisible-character', 'hard-tab', 'leading-whitespace',
-  'trailing-whitespace', 'eol', 'indent-guide', 'fold-marker'
-])
 
 class StylesElement extends HTMLElement
   subscriptions: null
@@ -24,9 +19,6 @@ class StylesElement extends HTMLElement
     @styleElementClonesByOriginalElement = new WeakMap
 
   attachedCallback: ->
-    for styleElement in @children
-      @upgradeDeprecatedSelectors(styleElement)
-
     @context = @getAttribute('context') ? undefined
 
   detachedCallback: ->
@@ -68,7 +60,6 @@ class StylesElement extends HTMLElement
           break
 
     @insertBefore(styleElementClone, insertBefore)
-    @upgradeDeprecatedSelectors(styleElementClone)
     @emitter.emit 'did-add-style-element', styleElementClone
 
   styleElementRemoved: (styleElement) ->
@@ -88,52 +79,4 @@ class StylesElement extends HTMLElement
   styleElementMatchesContext: (styleElement) ->
     not @context? or styleElement.context is @context
 
-  upgradeDeprecatedSelectors: (styleElement) ->
-    return unless styleElement.sheet?
-
-    transformDeprecatedShadowSelectors = (selectors) ->
-      selectors.each (selector) ->
-        isSyntaxSelector = not selector.some((node) ->
-          (node.type is 'tag' and node.value is 'atom-text-editor') or
-          (node.type is 'class' and node.value is 'region') or
-          (node.type is 'class' and node.value is 'wrap-guide') or
-          (node.type is 'class' and /spell-check/.test(node.value))
-        )
-        previousNode = null
-        selector.each (node) ->
-          isShadowPseudoClass = node.type is 'pseudo' and node.value is '::shadow'
-          isHostPseudoClass = node.type is 'pseudo' and node.value is ':host'
-          if isHostPseudoClass and not previousNode?
-            newNode = selectorProcessor.tag({value: 'atom-text-editor'})
-            node.replaceWith(newNode)
-            previousNode = newNode
-          else if isShadowPseudoClass and previousNode?.type is 'tag' and previousNode?.value is 'atom-text-editor'
-            selector.removeChild(node)
-          else
-            if styleElement.context is 'atom-text-editor' and node.type is 'class'
-              if (isSyntaxSelector and not node.value.startsWith('syntax--')) or SPATIAL_DECORATIONS.has(node.value)
-                node.value = 'syntax--' + node.value
-            previousNode = node
-
-    upgradedSelectors = []
-    for rule in styleElement.sheet.cssRules when rule.selectorText?
-      inputSelector = rule.selectorText
-      outputSelector = rule.selectorText
-      outputSelector = selectorProcessor(transformDeprecatedShadowSelectors).process(outputSelector).result
-      if inputSelector isnt outputSelector
-        rule.selectorText = outputSelector
-        upgradedSelectors.push({inputSelector, outputSelector})
-
-    if upgradedSelectors.length > 0
-      upgradedSelectorsText = upgradedSelectors.map(({inputSelector, outputSelector}) -> "`#{inputSelector}` => `#{outputSelector}`").join('\n')
-      console.warn("""
-      Shadow DOM for `atom-text-editor` elements has been removed. This means
-      should stop using :host and ::shadow pseudo-selectors, and prepend all
-      your syntax selectors with `syntax--`. To prevent breakage with existing
-      stylesheets, we have automatically upgraded the following selectors in
-      `#{styleElement.sourcePath}`:
-
-      #{upgradedSelectorsText}
-      """)
-
 module.exports = StylesElement = document.registerElement 'atom-styles', prototype: StylesElement.prototype