Tag scripts: drop [if ...] and [reset] syntax (fix #3807, #3773)

Fixes #3807. Drops the TagScript module entirely and replaces it with
a simple call to Post.tag.

Simultaneously fixes #3773 as a consequence of removing TagScript.run.
Post.update already updates data-tags by itself, so there was no need
for TagScript.run to update data-tags as well.

app/javascript/packs/application.js

@@ -38,4 +38,3 @@ export { default as Note } from '../src/javascripts/notes.js';
 export { default as PostModeMenu } from '../src/javascripts/post_mode_menu.js';
 export { default as Utility } from '../src/javascripts/utility.js';
 export { default as Ugoira } from '../src/javascripts/ugoira.js';
-export { default as TagScript } from '../src/javascripts/tag_script.js';

app/javascript/src/javascripts/post_mode_menu.js

@@ -2,7 +2,6 @@ import Utility from './utility'
 import Cookie from './cookie'
 import Post from './posts.js.erb'
 import Favorite from './favorites'
-import TagScript from './tag_script'
 
 let PostModeMenu = {};
 
@@ -175,7 +174,7 @@ PostModeMenu.click = function(e) {
   } else if (s === "tag-script") {
     var current_script_id = Cookie.get("current_tag_script_id");
     var tag_script = Cookie.get("tag-script-" + current_script_id);
-    TagScript.run(post_id, tag_script);
+    Post.tag(post_id, tag_script);
   } else {
     return;
   }

app/javascript/src/javascripts/posts.js.erb

@@ -535,6 +535,11 @@ Post.vote = function(score, id) {
   });
 }
 
+Post.tag = function(post_id, tags) {
+  const tag_string = (Array.isArray(tags) ? tags.join(" ") : String(tags));
+  Post.update(post_id, { "post[old_tag_string]": "", "post[tag_string]": tag_string });
+}
+
 Post.update = function(post_id, params) {
   Post.notice_update("inc");
 

app/javascript/src/javascripts/tag_script.js

@@ -1,58 +0,0 @@
-import Utility from './utility'
-import Post from './posts.js.erb'
-
-let TagScript = {};
-
-TagScript.parse = function(script) {
-  return script.match(/\[.+?\]|\S+/g);
-}
-
-TagScript.test = function(tags, predicate) {
-  var split_pred = predicate.match(/\S+/g);
-  var is_true = true;
-
-  $.each(split_pred, function(i, x) {
-    if (x[0] === "-") {
-      if ($.inArray(x.substr(1, 100), tags)) {
-        is_true = false;
-      }
-    } else if (!$.inArray(x, tags)) {
-      is_true = false;
-    }
-  });
-
-  return is_true;
-}
-
-TagScript.process = function(tags, command) {
-  if (command.match(/^\[if/)) {
-    var match = command.match(/\[if\s+(.+?)\s*,\s*(.+?)\]/);
-    if (TagScript.test(tags, match[1])) {
-      return TagScript.process(tags, match[2]);
-    } else {
-      return tags;
-    }
-  } else if (command === "[reset]") {
-    return [];
-  } else if (command[0] === "-" && !command.match(/^(?:-pool|-parent|-fav|-favgroup):/i)) {
-    return Utility.reject(tags, function(x) {return x === command.substr(1, 100)});
-  } else {
-    tags.push(command);
-    return tags;
-  }
-}
-
-TagScript.run = function(post_id, tag_script) {
-  var commands = TagScript.parse(tag_script);
-  var $post = $("#post_" + post_id);
-  var old_tags = $post.data("tags");
-
-  $.each(commands, function(i, x) {
-    var array = String($post.data("tags")).match(/\S+/g);
-    $post.data("tags", TagScript.process(array, x).join(" "));
-  });
-
-  Post.update(post_id, {"post[old_tag_string]": old_tags, "post[tag_string]": $post.data("tags")});
-}
-
-export default TagScript

app/javascript/src/javascripts/utility.js

@@ -99,16 +99,6 @@ Utility.without = function(array, element) {
   return temp;
 }
 
-Utility.reject = function(array, f) {
-  var filtered = [];
-  $.each(array, function(i, x) {
-    if (!f(x)) {
-      filtered.push(x);
-    }
-  });
-  return filtered;
-}
-
 Utility.regexp_escape = function(string) {
   return string.replace(/([.?*+^$[\]\\(){}|-])/g, "\\$1");
 }