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Contents
# frozen_string_literal: true
module ThemeCheck
# Checks unused {% assign x = ... %}
class UnusedAssign < LiquidCheck
severity :suggestion
category :liquid
doc docs_url(__FILE__)
class TemplateInfo < Struct.new(:used_assigns, :assign_nodes, :includes)
def collect_used_assigns(templates, visited = Set.new)
collected = used_assigns
# Check recursively inside included snippets for use
includes.each do |name|
if templates[name] && !visited.include?(name)
visited << name
collected += templates[name].collect_used_assigns(templates, visited)
end
end
collected
end
end
def initialize
@templates = {}
end
def on_document(node)
@templates[node.template.name] = TemplateInfo.new(Set.new, {}, Set.new)
end
def on_assign(node)
@templates[node.template.name].assign_nodes[node.value.to] = node
end
def on_include(node)
if node.value.template_name_expr.is_a?(String)
@templates[node.template.name].includes << "snippets/#{node.value.template_name_expr}"
end
end
def on_variable_lookup(node)
@templates[node.template.name].used_assigns << node.value.name
end
def on_end
@templates.each_pair do |_, info|
used = info.collect_used_assigns(@templates)
info.assign_nodes.each_pair do |name, node|
unless used.include?(name)
add_offense("`#{name}` is never used", node: node)
end
end
end
end
end
end
Version data entries
25 entries across 25 versions & 1 rubygems