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|
module Journey
module Path
class Pattern
attr_reader :spec, :requirements, :anchored
def initialize strexp
parser = Journey::Parser.new
@anchored = true
case strexp
when String
@spec = parser.parse strexp
@requirements = {}
@separators = "/.?"
when Router::Strexp
@spec = parser.parse strexp.path
@requirements = strexp.requirements
@separators = strexp.separators.join
@anchored = strexp.anchor
else
raise "wtf bro: #{strexp}"
end
@names = nil
@optional_names = nil
@required_names = nil
@re = nil
@offsets = nil
end
def ast
@spec.grep(Nodes::Symbol).each do |node|
re = @requirements[node.to_sym]
node.regexp = re if re
end
@spec.grep(Nodes::Star).each do |node|
node = node.left
node.regexp = @requirements[node.to_sym] || /(.+)/
end
@spec
end
def names
@names ||= spec.grep(Nodes::Symbol).map { |n| n.name }
end
def required_names
@required_names ||= names - optional_names
end
def optional_names
@optional_names ||= spec.grep(Nodes::Group).map { |group|
group.grep(Nodes::Symbol)
}.flatten.map { |n| n.name }.uniq
end
class RegexpOffsets < Journey::Visitors::Visitor # :nodoc:
attr_reader :offsets
def initialize matchers
@matchers = matchers
@capture_count = [0]
end
def visit node
super
@capture_count
end
def visit_SYMBOL node
node = node.to_sym
if @matchers.key? node
re = /#{@matchers[node]}|/
@capture_count.push((re.match('').length - 1) + (@capture_count.last || 0))
else
@capture_count << (@capture_count.last || 0)
end
end
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
end
class UnanchoredRegexp < AnchoredRegexp # :nodoc:
def accept node
%r{\A#{visit node}}
end
end
class MatchData
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
viz = RegexpOffsets.new @requirements
@offsets = viz.accept spec
end
end
end
end
|
