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require 'mustermann/ast/translator'
module Mustermann
module AST
# Make sure #start and #stop is set on every node and within its parents #start and #stop.
# @!visibility private
class Boundaries < Translator
# @return [Mustermann::AST::Node] the ast passed as first argument
# @!visibility private
#def self.set_boundaries(ast, string: nil, start: 0, stop: string.length)
def self.set_boundaries(ast, options = {})
string = options.fetch(:string, nil)
start = options.fetch(:start, 0)
stop = options.fetch(:stop, string.length)
new.translate(ast, start, stop)
ast
end
translate(:node) do |start, stop|
t.set_boundaries(node, start, stop)
t(payload, node.start, node.stop)
end
translate(:with_look_ahead) do |start, stop|
t.set_boundaries(node, start, stop)
t(head, node.start, node.stop)
t(payload, node.start, node.stop)
end
translate(Array) do |start, stop|
each do |subnode|
t(subnode, start, stop)
start = subnode.stop
end
end
translate(Object) { |*| node }
# Checks that a node is within the given boundaries.
# @!visibility private
def set_boundaries(node, start, stop)
node.start = start if node.start.nil? or node.start < start
node.stop = node.start + node.min_size if node.stop.nil? or node.stop < node.start
node.stop = stop if node.stop > stop
end
end
end
end
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