module ActionDispatch # :stopdoc: module Journey class Format ESCAPE_PATH = ->(value) { Router::Utils.escape_path(value) } ESCAPE_SEGMENT = ->(value) { Router::Utils.escape_segment(value) } Parameter = Struct.new(:name, :escaper) do def escape(value); escaper.call value; end end def self.required_path(symbol) Parameter.new symbol, ESCAPE_PATH end def self.required_segment(symbol) Parameter.new symbol, ESCAPE_SEGMENT end def initialize(parts) @parts = parts @children = [] @parameters = [] parts.each_with_index do |object, i| case object when Journey::Format @children << i when Parameter @parameters << i end end end def evaluate(hash) parts = @parts.dup @parameters.each do |index| param = parts[index] value = hash[param.name] return "".freeze unless value parts[index] = param.escape value end @children.each { |index| parts[index] = parts[index].evaluate(hash) } parts.join end end module Visitors # :nodoc: class Visitor # :nodoc: DISPATCH_CACHE = {} def accept(node) visit(node) end private def visit(node) send(DISPATCH_CACHE[node.type], node) end def binary(node) visit(node.left) visit(node.right) end def visit_CAT(n); binary(n); end def nary(node) node.children.each { |c| visit(c) } end def visit_OR(n); nary(n); end def unary(node) visit(node.left) end def visit_GROUP(n); unary(n); end def visit_STAR(n); unary(n); end def terminal(node); end def visit_LITERAL(n); terminal(n); end def visit_SYMBOL(n); terminal(n); end def visit_SLASH(n); terminal(n); end def visit_DOT(n); terminal(n); end private_instance_methods(false).each do |pim| next unless pim =~ /^visit_(.*)$/ DISPATCH_CACHE[$1.to_sym] = pim end end class FunctionalVisitor # :nodoc: DISPATCH_CACHE = {} def accept(node, seed) visit(node, seed) end def visit(node, seed) send(DISPATCH_CACHE[node.type], node, seed) end def binary(node, seed) visit(node.right, visit(node.left, seed)) end def visit_CAT(n, seed); binary(n, seed); end def nary(node, seed) node.children.inject(seed) { |s, c| visit(c, s) } end def visit_OR(n, seed); nary(n, seed); end def unary(node, seed) visit(node.left, seed) end def visit_GROUP(n, seed); unary(n, seed); end def visit_STAR(n, seed); unary(n, seed); end def terminal(node, seed); seed; end def visit_LITERAL(n, seed); terminal(n, seed); end def visit_SYMBOL(n, seed); terminal(n, seed); end def visit_SLASH(n, seed); terminal(n, seed); end def visit_DOT(n, seed); terminal(n, seed); end instance_methods(false).each do |pim| next unless pim =~ /^visit_(.*)$/ DISPATCH_CACHE[$1.to_sym] = pim end end class FormatBuilder < Visitor # :nodoc: def accept(node); Journey::Format.new(super); end def terminal(node); [node.left]; end def binary(node) visit(node.left) + visit(node.right) end def visit_GROUP(n); [Journey::Format.new(unary(n))]; end def visit_STAR(n) [Journey::Format.required_path(n.left.to_sym)] end def visit_SYMBOL(n) symbol = n.to_sym if symbol == :controller [Journey::Format.required_path(symbol)] else [Journey::Format.required_segment(symbol)] end end end # Loop through the requirements AST. class Each < FunctionalVisitor # :nodoc: def visit(node, block) block.call(node) super end INSTANCE = new end class String < FunctionalVisitor # :nodoc: private def binary(node, seed) visit(node.right, visit(node.left, seed)) end def nary(node, seed) last_child = node.children.last node.children.inject(seed) { |s, c| string = visit(c, s) string << "|".freeze unless last_child == c string } end def terminal(node, seed) seed + node.left end def visit_GROUP(node, seed) visit(node.left, seed << "(".freeze) << ")".freeze end INSTANCE = new end class Dot < FunctionalVisitor # :nodoc: def initialize @nodes = [] @edges = [] end def accept(node, seed = [[], []]) super nodes, edges = seed <<-eodot digraph parse_tree { size="8,5" node [shape = none]; edge [dir = none]; #{nodes.join "\n"} #{edges.join("\n")} } eodot end private def binary(node, seed) seed.last.concat node.children.map { |c| "#{node.object_id} -> #{c.object_id};" } super end def nary(node, seed) seed.last.concat node.children.map { |c| "#{node.object_id} -> #{c.object_id};" } super end def unary(node, seed) seed.last << "#{node.object_id} -> #{node.left.object_id};" super end def visit_GROUP(node, seed) seed.first << "#{node.object_id} [label=\"()\"];" super end def visit_CAT(node, seed) seed.first << "#{node.object_id} [label=\"○\"];" super end def visit_STAR(node, seed) seed.first << "#{node.object_id} [label=\"*\"];" super end def visit_OR(node, seed) seed.first << "#{node.object_id} [label=\"|\"];" super end def terminal(node, seed) value = node.left seed.first << "#{node.object_id} [label=\"#{value}\"];" seed end INSTANCE = new end end end # :startdoc: end