# Class: IRB::SLex::Node

Inherits:
  Object
  - Object
  - IRB::SLex::Node
  show all

Defined in:
  lib/yard/parser/ruby/legacy/irb/slex.rb

## Overview

    class Node -

## Instance Attribute Summary collapse

- #postproc ⇒ Object

  Returns the value of attribute postproc.

- #preproc ⇒ Object

  Returns the value of attribute preproc.

## Instance Method Summary collapse

- #create_subnode(chrs, preproc = nil, postproc = nil) ⇒ Object
- #initialize(preproc = nil, postproc = nil) ⇒ Node constructor

  if postproc is nil, this node is an abstract node.

- #match(chrs, op = "") ⇒ Object

  chrs: String character array io must have getc()/ungetc(); and ungetc() must be able to be called arbitrary number of times.

- #match_io(io, op = "") ⇒ Object
- #search(chrs, opt = nil) ⇒ Object

## Constructor Details

### #initialize(preproc = nil, postproc = nil) ⇒ `Node`

if postproc is nil, this node is an abstract node. if postproc is non-nil, this node is a real node.

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    # File 'lib/yard/parser/ruby/legacy/irb/slex.rb', line 89

    def initialize(preproc = nil, postproc = nil)
      @Tree = {}
      @preproc = preproc
      @postproc = postproc
    end

## Instance Attribute Details

### #postproc ⇒ `Object`

Returns the value of attribute postproc.

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    # File 'lib/yard/parser/ruby/legacy/irb/slex.rb', line 96

    def postproc
      @postproc
    end

### #preproc ⇒ `Object`

Returns the value of attribute preproc.

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    # File 'lib/yard/parser/ruby/legacy/irb/slex.rb', line 95

    def preproc
      @preproc
    end

## Instance Method Details

### #create_subnode(chrs, preproc = nil, postproc = nil) ⇒ `Object`

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    # File 'lib/yard/parser/ruby/legacy/irb/slex.rb', line 113

    def create_subnode(chrs, preproc = nil, postproc = nil)
      if chrs.empty?
        if @postproc
          D_DETAIL.pp node
          raise "node already exists"
        else
          D_DEBUG.puts "change abstract node to real node."
          @preproc = preproc
          @postproc = postproc
        end
        return self
      end

      ch = chrs.shift
      if node = @Tree[ch]
        if chrs.empty?
          if node.postproc
            DebugLogger.pp node
            DebugLogger.pp self
            DebugLogger.pp ch
            DebugLogger.pp chrs
            raise "node already exists"
          else
            D_WARN.puts "change abstract node to real node"
            node.preproc = preproc
            node.postproc = postproc
          end
        else
          node.create_subnode(chrs, preproc, postproc)
        end
      else
        if chrs.empty?
          node = Node.new(preproc, postproc)
        else
          node = Node.new
          node.create_subnode(chrs, preproc, postproc)
        end
        @Tree[ch] = node
      end
      node
    end

### #match(chrs, op = "") ⇒ `Object`

chrs: String

    character array
    io must have getc()/ungetc(); and ungetc() must be
    able to be called arbitrary number of times.

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    # File 'lib/yard/parser/ruby/legacy/irb/slex.rb', line 161

    def match(chrs, op = "")
      D_DETAIL.print "match>: ", chrs, "op:", op, "\n"
      if chrs.empty?
        if @preproc.nil? || @preproc.call(op, chrs)
          DOUT.printf(D_DETAIL, "op1: %s\n", op)
          @postproc.call(op, chrs)
        else
          nil
        end
      else
        ch = chrs.shift
        if node = @Tree[ch]
          if ret = node.match(chrs, op+ch)
            return ret
          else
            chrs.unshift ch
            if @postproc and @preproc.nil? || @preproc.call(op, chrs)
              DOUT.printf(D_DETAIL, "op2: %s\n", op.inspect)
              ret = @postproc.call(op, chrs)
              return ret
            else
              return nil
            end
          end
        else
          chrs.unshift ch
          if @postproc and @preproc.nil? || @preproc.call(op, chrs)
            DOUT.printf(D_DETAIL, "op3: %s\n", op)
            @postproc.call(op, chrs)
            return ""
          else
            return nil
          end
        end
      end
    end

### #match_io(io, op = "") ⇒ `Object`

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    # File 'lib/yard/parser/ruby/legacy/irb/slex.rb', line 198

    def match_io(io, op = "")
      if op == ""
        ch = io.getc
        if ch == nil
          return nil
        end
      else
        ch = io.getc_of_rests
      end
      if ch.nil?
        if @preproc.nil? || @preproc.call(op, io)
          D_DETAIL.printf("op1: %s\n", op)
          @postproc.call(op, io)
        else
          nil
        end
      else
        if node = @Tree[ch]
          if ret = node.match_io(io, op+ch)
            ret
          else
            io.ungetc ch
            if @postproc and @preproc.nil? || @preproc.call(op, io)
              DOUT.exec_if{D_DETAIL.printf "op2: %s\n", op.inspect}
              @postproc.call(op, io)
            else
              nil
            end
          end
        else
          io.ungetc ch
          if @postproc and @preproc.nil? || @preproc.call(op, io)
            D_DETAIL.printf("op3: %s\n", op)
            @postproc.call(op, io)
          else
            nil
          end
        end
      end
    end

### #search(chrs, opt = nil) ⇒ `Object`

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    # File 'lib/yard/parser/ruby/legacy/irb/slex.rb', line 98

    def search(chrs, opt = nil)
      return self if chrs.empty?
      ch = chrs.shift
      if node = @Tree[ch]
        node.search(chrs, opt)
      else
        if opt
          chrs.unshift ch
          self.create_subnode(chrs)
        else
          raise "node nothing"
        end
      end
    end