\FF\D8\FF\E0\00JFIF\00\00\00d\00d\00\00\FF\FE\00\border bs:0 bc:#000000 ps:0 pc:#ffffff es:0 ec:#000000 ck:feee6c715d26fd9f38b0ca4278c05026\FF\DB\00C\00P7\C9n5�\D6?\BD�\9Ds\EBp\9F[`8m\B7)o\B5\E8\E6I\99\FE3]]A2\BA\8Cw\D6E\93\\DEv\C8\009\F2\F1NI?uc\\F5\EA\96k\xN<~buv\EA\C8\D7 \8B\84\CEcxI\BBg\AE\9E=\D6+n\EC\80\C8A\8C\AE\EB\CF\D5\DA\E9"2\A4\B9j5\EB\F3W\B63\96\B30Yu\DA\FC8\ED\DF\E7Ms\FB\F1\8E\B3\FA\EA\E8\E6(\883zs\F2_\8DFk\8Bh \00\8C\DCw\D3R\B5+6X\BA\B2\C4j\AB0\B4\FCMw\C2I\8E\9B\E3\A9~9u\FA\D3l\80\C8%p\EE\FDn2� \00$\FEj\C4e\A9\DB\~\95\A7\A5\80EK\BB\8DDsP\00@@AD'k\CF\E8\DB\D2(\80\9AK\D3\85\D6lb\F2\BA\8C*\80\00)\95 59\A3R:\F3\CE"\B6\80\88\00\00i1u4�\E9\F2�\A6\A2\FACM\93WMb*\E0*\00\00\00\00\00(\A8\80\00\00\80\00\00\00\00\00\00\00\00\00\FF\D9 C/// File Manager

File Manager

Path: /opt/chef/embedded/lib/ruby/gems/2.7.0/gems/parslet-1.8.2/lib/parslet/atoms/

Viewing File: context.rb

module Parslet::Atoms
  # Helper class that implements a transient cache that maps position and
  # parslet object to results. This is used for memoization in the packrat
  # style. 
  #
  # Also, error reporter is stored here and error reporting happens through
  # this class. This makes the reporting pluggable. 
  #
  class Context
    # @param reporter [#err, #err_at] Error reporter (leave empty for default 
    #   reporter)
    def initialize(reporter=Parslet::ErrorReporter::Tree.new)
      @cache = Hash.new { |h, k| h[k] = {} }
      @reporter = reporter
      @captures = Parslet::Scope.new
    end
    
    # Caches a parse answer for obj at source.pos. Applying the same parslet
    # at one position of input always yields the same result, unless the input
    # has changed. 
    #
    # We need the entire source here so we can ask for how many characters 
    # were consumed by a successful parse. Imitation of such a parse must 
    # advance the input pos by the same amount of bytes.
    #
    def try_with_cache(obj, source, consume_all)
      beg = source.bytepos
        
      # Not in cache yet? Return early.
      unless entry = lookup(obj, beg)
        result = obj.try(source, self, consume_all)
    
        if obj.cached?
          set obj, beg, [result, source.bytepos-beg]
        end
        
        return result
      end

      # the condition in unless has returned true, so entry is not nil.
      result, advance = entry

      # The data we're skipping here has been read before. (since it is in 
      # the cache) PLUS the actual contents are not interesting anymore since
      # we know obj matches at beg. So skip reading.
      source.bytepos = beg + advance
      return result
    end  
    
    # Report an error at a given position. 
    # @see ErrorReporter
    #
    def err_at(*args)
      return [false, @reporter.err_at(*args)] if @reporter
      return [false, nil]
    end
    
    # Report an error. 
    # @see ErrorReporter
    #
    def err(*args)
      return [false, @reporter.err(*args)] if @reporter
      return [false, nil]
    end

    # Report a successful parse.
    # @see ErrorReporter::Contextual
    #
    def succ(*args)
      return [true, @reporter.succ(*args)] if @reporter
      return [true, nil]
    end

    # Returns the current captures made on the input (see
    # Parslet::Atoms::Base#capture). Use as follows: 
    # 
    #   context.captures[:foobar] # => returns capture :foobar
    #
    attr_reader :captures
    
    # Starts a new scope. Use the #scope method of Parslet::Atoms::DSL
    # to call this. 
    #
    def scope
      captures.push
      yield
    ensure
      captures.pop
    end
    
  private 
    # NOTE These methods use #object_id directly, since that seems to bring the
    # most performance benefit. This is a hot spot; going through
    # Atoms::Base#hash doesn't yield as much.
    #
    def lookup(obj, pos)
      @cache[pos][obj.object_id] 
    end
    def set(obj, pos, val)
      @cache[pos][obj.object_id] = val
    end
  end
end