86 lines
2.5 KiB
Ruby
86 lines
2.5 KiB
Ruby
module Banzai
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# Class for rendering multiple objects (e.g. Note instances) in a single pass.
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#
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# Rendered Markdown is stored in an attribute in every object based on the
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# name of the attribute containing the Markdown. For example, when the
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# attribute `note` is rendered the HTML is stored in `note_html`.
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class ObjectRenderer
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attr_reader :project, :user
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# Make sure to set the appropriate pipeline in the `raw_context` attribute
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# (e.g. `:note` for Note instances).
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#
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# project - A Project to use for rendering and redacting Markdown.
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# user - The user viewing the Markdown/HTML documents, if any.
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# context - A Hash containing extra attributes to use in the rendering
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# pipeline.
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def initialize(project, user = nil, raw_context = {})
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@project = project
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@user = user
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@raw_context = raw_context
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end
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# Renders and redacts an Array of objects.
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#
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# objects - The objects to render
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# attribute - The attribute containing the raw Markdown to render.
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#
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# Returns the same input objects.
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def render(objects, attribute)
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documents = render_objects(objects, attribute)
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redacted = redact_documents(documents)
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objects.each_with_index do |object, index|
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object.__send__("#{attribute}_html=", redacted.fetch(index))
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end
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objects
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end
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# Renders the attribute of every given object.
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def render_objects(objects, attribute)
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objects.map do |object|
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render_attribute(object, attribute)
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end
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end
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# Redacts the list of documents.
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#
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# Returns an Array containing the redacted documents.
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def redact_documents(documents)
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redactor = Redactor.new(project, user)
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redactor.redact(documents).map do |document|
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document.to_html.html_safe
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end
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end
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# Returns a Banzai context for the given object and attribute.
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def context_for(object, attribute)
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context = base_context.merge(cache_key: [object, attribute])
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if object.respond_to?(:author)
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context[:author] = object.author
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end
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context
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end
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# Renders the attribute of an object.
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#
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# Returns a `Nokogiri::HTML::Document`.
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def render_attribute(object, attribute)
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context = context_for(object, attribute)
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string = object.__send__(attribute)
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html = Banzai.render(string, context)
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Banzai::Pipeline[:relative_link].to_document(html, context)
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end
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def base_context
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@base_context ||= @raw_context.merge(current_user: user, project: project)
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end
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end
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end
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