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nelsonfigueroanelsonfigueroa
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Add ERB lexer (#1228)
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‎lexers/embedded/erb.xml‎

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<lexer>
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<config>
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<name>ERB</name>
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<dot_all>true</dot_all>
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</config>
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<rules>
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<state name="root">
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<rule pattern="(&lt;%#)(.*?)(-?%&gt;)">
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<bygroups>
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<token type="CommentPreproc"/>
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<token type="Comment"/>
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<token type="CommentPreproc"/>
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</bygroups>
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</rule>
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<rule pattern="(&lt;%-?=)(.*?)(-?%&gt;)">
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<bygroups>
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<token type="CommentPreproc"/>
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<using lexer="Ruby"/>
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<token type="CommentPreproc"/>
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</bygroups>
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</rule>
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<rule pattern="(&lt;%-?)(.*?)(-?%&gt;)">
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<bygroups>
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<token type="CommentPreproc"/>
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<using lexer="Ruby"/>
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<token type="CommentPreproc"/>
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</bygroups>
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</rule>
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<rule pattern="[^&lt;]+">
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<token type="Other"/>
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</rule>
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<rule pattern="&lt;">
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<token type="Other"/>
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</rule>
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</state>
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</rules>
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</lexer>

‎lexers/erb.go‎

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package lexers
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import (
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"strings"
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. "github.com/alecthomas/chroma/v2" // nolint
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)
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// ERB lexer is Ruby embedded in HTML.
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var ERB = Register(DelegatingLexer(HTML, MustNewXMLLexer(
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embedded,
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"embedded/erb.xml",
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).SetConfig(
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&Config{
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Name: "ERB",
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Aliases: []string{"erb", "html+erb", "html+ruby", "rhtml"},
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Filenames: []string{"*.erb", "*.html.erb", "*.xml.erb", "*.rhtml"},
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MimeTypes: []string{"application/x-ruby-templating"},
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DotAll: true,
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},
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).SetAnalyser(func(text string) float32 {
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if strings.Contains(text, "<%=") && strings.Contains(text, "%>") {
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return 0.4
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}
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if strings.Contains(text, "<%") {
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return 0.1
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}
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return 0.0
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})))

‎lexers/testdata/erb.actual‎

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<!DOCTYPE html>
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<html lang="<%= I18n.locale %>">
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<head>
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<title><%= content_for?(:title) ? yield(:title) : "Default Title" %></title>
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<%= csrf_meta_tags %>
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<%= csp_meta_tag %>
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<%= stylesheet_link_tag "application", "data-turbo-track": "reload" %>
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</head>
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<body class="<%= controller_name %> <%= action_name %>">
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<%# Navigation partial %>
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<%= render "shared/navbar", user: current_user %>
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<%# ERB comment spanning
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multiple lines %>
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<% if current_user.admin? %>
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<div class="admin-banner">
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<p>Welcome, <%= current_user.name %>! You have <%= current_user.roles.count %> roles.</p>
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</div>
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<% end %>
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<% @posts.each_with_index do |post, index| %>
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<article id="post-<%= post.id %>" class="<%= cycle('odd', 'even') %>" data-tags="<%= post.tags.pluck(:name).join(',') %>">
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<h2><%= link_to post.title, post_path(post), class: "post-link" %></h2>
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<div class="meta">
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<span><%= l(post.created_at, format: :long) %></span>
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<span><%= pluralize(post.comments.count, "comment") %></span>
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<%= "Featured" if post.featured? %>
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</div>
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<div class="body">
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<%= sanitize post.body, tags: %w[p br strong em a ul ol li code pre], attributes: %w[href class id] %>
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</div>
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<% if post.tags.any? %>
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<ul class="tags">
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<% post.tags.each do |tag| %>
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<li><%= link_to tag.name, tag_path(tag) %></li>
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<% end %>
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</ul>
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<% end %>
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<%# Render comments if they exist %>
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<% unless post.comments.empty? %>
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<section class="comments">
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<%= render partial: "comments/comment", collection: post.comments, as: :comment, locals: { editable: current_user&.admin? } %>
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</section>
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<% end %>
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</article>
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<% end %>
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<%= form_with(model: @post, local: true, data: { turbo: false, controller: "form" }) do |f| %>
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<% if @post.errors.any? %>
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<div id="error_explanation">
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<h2><%= pluralize(@post.errors.count, "error") %> prohibited this post from being saved:</h2>
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<ul>
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<% @post.errors.full_messages.each do |message| %>
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<li><%= message %></li>
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<% end %>
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</ul>
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</div>
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<% end %>
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<div class="field">
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<%= f.label :title %>
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<%= f.text_field :title, placeholder: "Enter title...", required: true, maxlength: 255 %>
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</div>
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<div class="field">
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<%= f.label :body %>
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<%= f.text_area :body, rows: 10, data: { action: "input->form#validate" } %>
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</div>
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<div class="field">
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<%= f.label :category_id %>
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<%= f.collection_select :category_id, Category.order(:name), :id, :name, { prompt: "Select a category" }, { class: "form-control" } %>
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</div>
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<div class="actions">
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<%= f.submit @post.persisted? ? "Update Post" : "Create Post", class: "btn btn-primary" %>
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<%= link_to "Cancel", posts_path, class: "btn btn-secondary" %>
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</div>
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<% end %>
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<%- trimmed = @items.select { |i| i.active? && i.visible_to?(current_user) } -%>
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<%= render partial: "items/grid", locals: { items: trimmed, columns: 3 } %>
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<% content_for :sidebar do %>
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<div class="sidebar">
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<h3>Recent Posts</h3>
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<ul>
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<% Post.published.order(created_at: :desc).limit(5).each do |post| %>
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<li><%= link_to post.title, post %></li>
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<% end %>
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</ul>
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<h3>Archives</h3>
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<% Post.published.group_by { |p| p.created_at.strftime("%B %Y") }.each do |month, posts| %>
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<p><%= link_to "#{month} (#{posts.size})", archive_path(month: month) %></p>
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<% end %>
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</div>
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<% end %>
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<script>
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var postCount = <%= @posts.count %>;
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var config = <%= raw({ api_key: ENV["API_KEY"], debug: Rails.env.development? }.to_json) %>;
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</script>
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<%= javascript_include_tag "application", "data-turbo-track": "reload", defer: true %>
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</body>
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</html>

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