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module ActionDispatch
module Journey # :nodoc:
module Path # :nodoc:
class Pattern # :nodoc:
attr_reader :spec, :requirements, :anchored
def self.from_string string
build(string, {}, "/.?", true)
end
def self.build(path, requirements, separators, anchored)
parser = Journey::Parser.new
ast = parser.parse path
new ast, requirements, separators, anchored
end
def initialize(ast, requirements, separators, anchored)
@spec = ast
@requirements = requirements
@separators = separators
@anchored = anchored
@names = nil
@optional_names = nil
@required_names = nil
@re = nil
@offsets = nil
end
def build_formatter
Visitors::FormatBuilder.new.accept(spec)
end
def ast
@spec.find_all(&:symbol?).each do |node|
re = @requirements[node.to_sym]
node.regexp = re if re
end
@spec.find_all(&:star?).each do |node|
node = node.left
node.regexp = @requirements[node.to_sym] || /(.+)/
end
@spec
end
def names
@names ||= spec.grep(Nodes::Symbol).map(&:name)
end
def required_names
@required_names ||= names - optional_names
end
def optional_names
@optional_names ||= spec.grep(Nodes::Group).flat_map { |group|
group.grep(Nodes::Symbol)
}.map(&:name).uniq
end
class AnchoredRegexp < Journey::Visitors::Visitor # :nodoc:
def initialize(separator, matchers)
@separator = separator
@matchers = matchers
@separator_re = "([^#{separator}]+)"
super()
end
def accept(node)
%r{\A#{visit node}\Z}
end
def visit_CAT(node)
[visit(node.left), visit(node.right)].join
end
def visit_SYMBOL(node)
node = node.to_sym
return @separator_re unless @matchers.key?(node)
re = @matchers[node]
"(#{re})"
end
def visit_GROUP(node)
"(?:#{visit node.left})?"
end
def visit_LITERAL(node)
Regexp.escape(node.left)
end
alias :visit_DOT :visit_LITERAL
def visit_SLASH(node)
node.left
end
def visit_STAR(node)
re = @matchers[node.left.to_sym] || '.+'
"(#{re})"
end
def visit_OR(node)
children = node.children.map { |n| visit n }
"(?:#{children.join(?|)})"
end
end
class UnanchoredRegexp < AnchoredRegexp # :nodoc:
def accept(node)
%r{\A#{visit node}}
end
end
class MatchData # :nodoc:
attr_reader :names
def initialize(names, offsets, match)
@names = names
@offsets = offsets
@match = match
end
def captures
(length - 1).times.map { |i| self[i + 1] }
end
def [](x)
idx = @offsets[x - 1] + x
@match[idx]
end
def length
@offsets.length
end
def post_match
@match.post_match
end
def to_s
@match.to_s
end
end
def match(other)
return unless match = to_regexp.match(other)
MatchData.new(names, offsets, match)
end
alias :=~ :match
def source
to_regexp.source
end
def to_regexp
@re ||= regexp_visitor.new(@separators, @requirements).accept spec
end
private
def regexp_visitor
@anchored ? AnchoredRegexp : UnanchoredRegexp
end
def offsets
return @offsets if @offsets
@offsets = [0]
spec.find_all(&:symbol?).each do |node|
node = node.to_sym
if @requirements.key?(node)
re = /#{@requirements[node]}|/
@offsets.push((re.match('').length - 1) + @offsets.last)
else
@offsets << @offsets.last
end
end
@offsets
end
end
end
end
end
|
