# class IRB::Color::SymbolState

A class to manage a state to know whether the current token is for `Symbol` or not.

### Public Class Methods

new() click to toggle source

    # File lib/irb/color.rb, line 219
    def initialize
      # Push `true` to detect Symbol. `false` to increase the nest level for non-Symbol.
      @stack = []
    end

### Public Instance Methods

scan_token(token) click to toggle source

Return true if the token is a part of `Symbol`.

    # File lib/irb/color.rb, line 225
    def scan_token(token)
      prev_state = @stack.last
      case token
      when :on_symbeg, :on_symbols_beg, :on_qsymbols_beg
        @stack << true
      when :on_ident, :on_op, :on_const, :on_ivar, :on_cvar, :on_gvar, :on_kw
        if @stack.last # Pop only when it's Symbol
          @stack.pop
          return prev_state
        end
      when :on_tstring_beg
        @stack << false
      when :on_embexpr_beg
        @stack << false
        return prev_state
      when :on_tstring_end # :on_tstring_end may close Symbol
        @stack.pop
        return prev_state
      when :on_embexpr_end
        @stack.pop
      end
      @stack.last
    end