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# frozen_string_literal: true
require "action_dispatch/journey/nfa/dot"
module ActionDispatch
module Journey # :nodoc:
module GTG # :nodoc:
class TransitionTable # :nodoc:
include Journey::NFA::Dot
attr_reader :memos
def initialize
@regexp_states = {}
@string_states = {}
@accepting = {}
@memos = Hash.new { |h, k| h[k] = [] }
end
def add_accepting(state)
@accepting[state] = true
end
def accepting_states
@accepting.keys
end
def accepting?(state)
@accepting[state]
end
def add_memo(idx, memo)
@memos[idx] << memo
end
def memo(idx)
@memos[idx]
end
def eclosure(t)
Array(t)
end
def move(t, a)
return [] if t.empty?
regexps = []
t.map { |s|
if states = @regexp_states[s]
regexps.concat states.map { |re, v| re === a ? v : nil }
end
if states = @string_states[s]
states[a]
end
}.compact.concat regexps
end
def as_json(options = nil)
simple_regexp = Hash.new { |h, k| h[k] = {} }
@regexp_states.each do |from, hash|
hash.each do |re, to|
simple_regexp[from][re.source] = to
end
end
{
regexp_states: simple_regexp,
string_states: @string_states,
accepting: @accepting
}
end
def to_svg
svg = IO.popen("dot -Tsvg", "w+") { |f|
f.write(to_dot)
f.close_write
f.readlines
}
3.times { svg.shift }
svg.join.sub(/width="[^"]*"/, "").sub(/height="[^"]*"/, "")
end
def visualizer(paths, title = "FSM")
viz_dir = File.join __dir__, "..", "visualizer"
fsm_js = File.read File.join(viz_dir, "fsm.js")
fsm_css = File.read File.join(viz_dir, "fsm.css")
erb = File.read File.join(viz_dir, "index.html.erb")
states = "function tt() { return #{to_json}; }"
fun_routes = paths.sample(3).map do |ast|
ast.map { |n|
case n
when Nodes::Symbol
case n.left
when ":id" then rand(100).to_s
when ":format" then %w{ xml json }.sample
else
"omg"
end
when Nodes::Terminal then n.symbol
else
nil
end
}.compact.join
end
stylesheets = [fsm_css]
svg = to_svg
javascripts = [states, fsm_js]
fun_routes = fun_routes
stylesheets = stylesheets
svg = svg
javascripts = javascripts
require "erb"
template = ERB.new erb
template.result(binding)
end
def []=(from, to, sym)
to_mappings = states_hash_for(sym)[from] ||= {}
to_mappings[sym] = to
end
def states
ss = @string_states.keys + @string_states.values.flat_map(&:values)
rs = @regexp_states.keys + @regexp_states.values.flat_map(&:values)
(ss + rs).uniq
end
def transitions
@string_states.flat_map { |from, hash|
hash.map { |s, to| [from, s, to] }
} + @regexp_states.flat_map { |from, hash|
hash.map { |s, to| [from, s, to] }
}
end
private
def states_hash_for(sym)
case sym
when String
@string_states
when Regexp
@regexp_states
else
raise ArgumentError, "unknown symbol: %s" % sym.class
end
end
end
end
end
end
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