115 lines
3.0 KiB
Ruby
115 lines
3.0 KiB
Ruby
# frozen_string_literal: true
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require_relative '../../lib/gitlab/utils/markdown'
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module HamlLint
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class Linter
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# This class is responsible for detection of help_page_path helpers
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# with incorrect links or anchors
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class DocumentationLinks < Linter
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include ::HamlLint::LinterRegistry
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include ::Gitlab::Utils::Markdown
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extend ::RuboCop::AST::NodePattern::Macros
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DOCS_DIRECTORY = File.join(File.expand_path('../..', __dir__), 'doc')
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def_node_matcher :help_link, <<~PATTERN
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(send _ {:help_page_url :help_page_path} $...)
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PATTERN
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MARKDOWN_HEADER = %r{\A\#{1,6}\s+(?<header>.+)\Z}.freeze
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def visit_script(node)
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check(node)
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end
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def visit_silent_script(node)
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check(node)
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end
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def visit_tag(node)
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check(node)
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end
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private
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def check(node)
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ast_tree = fetch_ast_tree(node)
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return unless ast_tree
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ast_tree.descendants.each do |child_node|
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match = extract_link_and_anchor(child_node)
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validate_node(node, match)
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end
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end
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def validate_node(node, match)
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return if match.empty?
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path_to_file = detect_path_to_file(match[:link])
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unless File.file?(path_to_file)
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record_lint(node, "help_page_path points to the unknown location: #{path_to_file}")
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return
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end
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unless correct_anchor?(path_to_file, match[:anchor])
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record_lint(node, "anchor (#{match[:anchor]}) is missing in: #{path_to_file}")
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end
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end
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def extract_link_and_anchor(ast_tree)
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link_match, attributes_match = help_link(ast_tree)
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{ link: fetch_link(link_match), anchor: fetch_anchor(attributes_match) }.compact
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end
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def fetch_ast_tree(node)
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# Sometimes links are provided via data attributes in html tag
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return node.parsed_attributes.syntax_tree if node.type == :tag
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parse_script(node).syntax_tree
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end
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def parse_script(node)
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# It's a workaround for cases for scripts ending with "do"
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# For some reason they don't parse correctly
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code = node.script.delete_suffix(' do')
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HamlLint::ParsedRuby.new(HamlLint::RubyParser.new.parse(code))
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end
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def detect_path_to_file(link)
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path = File.join(DOCS_DIRECTORY, link)
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path += '.md' unless path.end_with?('.md')
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path
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end
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def fetch_link(link_match)
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return unless link_match && link_match.str_type?
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link_match.value
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end
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def fetch_anchor(attributes_match)
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return unless attributes_match
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attributes_match.each_pair do |pkey, pvalue|
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break pvalue.value if pkey.value == :anchor
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end
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end
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def correct_anchor?(path_to_file, anchor)
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return true unless anchor
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File.open(path_to_file).any? do |line|
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result = line.match(MARKDOWN_HEADER)
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string_to_anchor(result[:header]) == anchor if result
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end
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end
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end
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end
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end
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