Class: Minjs::ECMA262::ECMA262String

Inherits:

Literal

• Object
• Base
• Literal
• Minjs::ECMA262::ECMA262String

Includes:

Ctype

Defined in:

lib/minjs/ecma262/lit.rb

Instance Attribute Summary

• #val ⇒ Object readonly

  Returns the value of attribute val.

Instance Method Summary

• #==(obj) ⇒ Object
• #deep_dup ⇒ Object
• #ecma262_typeof ⇒ Object
• #initialize(val) ⇒ ECMA262String constructor

  A new instance of ECMA262String.

• #left_hand_side_exp? ⇒ Boolean
• #to_ecma262_boolean ⇒ Object
• #to_ecma262_number ⇒ Object

  9.3.1 ToNumber Applied to the String Type.

• #to_ecma262_string ⇒ Object
• #to_js(options = {}) ⇒ Object
• #traverse(parent) {|_self, parent| ... } ⇒ Object

Methods included from Ctype

#decimal_digit?, #hex_digit?, #identifier_part?, #identifier_start?, #idname?, #line_terminator?, #octal_digit?, #white_space?

Methods inherited from Literal

#lt?, #priority, #to_exp?, #ws?

Methods inherited from Base

#add_remove_paren, #concat, #replace, #to_s

Constructor Details

#initialize(val) ⇒ ECMA262String

# File 'lib/minjs/ecma262/lit.rb', line 251

def initialize(val)
  @val = val
end

Instance Attribute Details

#val ⇒ Object (readonly)

Returns the value of attribute val.

# File 'lib/minjs/ecma262/lit.rb', line 249

def val
  @val
end

Instance Method Details

#==(obj) ⇒ Object

# File 'lib/minjs/ecma262/lit.rb', line 263

def ==(obj)
  self.class == obj.class and @val == obj.val
end

#deep_dup ⇒ Object

# File 'lib/minjs/ecma262/lit.rb', line 255

def deep_dup
  self.class.new(@val)
end

#ecma262_typeof ⇒ Object

# File 'lib/minjs/ecma262/lit.rb', line 428

def ecma262_typeof
  :string
end

#left_hand_side_exp? ⇒ Boolean

# File 'lib/minjs/ecma262/lit.rb', line 312

def left_hand_side_exp?
  true
end

#to_ecma262_boolean ⇒ Object

# File 'lib/minjs/ecma262/lit.rb', line 316

def to_ecma262_boolean
  if @val.length == 0
    false
  else
    true
  end
end

#to_ecma262_number ⇒ Object

9.3.1 ToNumber Applied to the String Type

# File 'lib/minjs/ecma262/lit.rb', line 328

def to_ecma262_number
  begin
    pos1 = pos0 = pos = 0
    v = @val.codepoints
    while true
      return 0 if v[pos].nil? # ToInteger(empty string) => 0
      if white_space?(v[pos]) or line_terminator?(v[pos])
        pos += 1
      else
        break
      end
    end
    #hex
    if v[pos] == 0x30 and (v[pos+1] == 0x78 || v[pos+1] == 0x58) and hex_digit?(v[pos+2])
      base = 16
      pos += 2
      pos0 = pos
      while true
        break if v[pos].nil?
        if hex_digit?(v[pos])
          pos += 1
        else
          break
        end
      end
    #decimal
    else
      base = 10
      sign = 1
      pos0 = pos
      if v[pos].nil?
        raise :error
      elsif v[pos] == 0x2b #+
        pos += 1
      elsif v[pos] == 0x2d #-
        sign = -1
        pos += 1
      end
      has_decimal = false
      has_exp = false

      while true
        break if v[pos].nil?
        if v[pos] >= 0x30 and v[pos] <= 0x39
          pos += 1
        elsif v[pos] == 0x2e #.
          pos += 1
          has_decimal = true
          break;
        else
          break
        end
      end
      if has_decimal
        while true
          break if v[pos].nil?
          if v[pos] >= 0x30 and v[pos] <= 0x39
            pos += 1
          elsif v[pos] == 0x45 or v[pos] == 0x65 #E/e
            pos += 1
            has_exp = true
            break;
          else
            break
          end
        end
      end
      if has_exp
        if v[pos] == 0x2b #+
          pos += 1
        else v[pos] == 0x2d #-
          pos += 1
        end
        while true
          break if v[pos].nil?
          if v[pos] >= 0x30 and v[pos] <= 0x39
            pos += 1
          else
            break
          end
        end
      end
    end
    pos1 = pos
    while white_space?(v[pos]) or line_terminator?(v[pos])
      raise :error if v[pos].nil?
      pos += 1
    end
    raise :error unless v[pos].nil?
    if base == 16
      ret = v[pos0...pos1].pack("U*").to_i(base)
    else
      ret = v[pos0...pos1].pack("U*").to_f
    end
  rescue => e
    ret = nil #Float::NAN
  end
  ret
end

#to_ecma262_string ⇒ Object

# File 'lib/minjs/ecma262/lit.rb', line 324

def to_ecma262_string
  @val.dup
end

#to_js(options = {}) ⇒ Object

# File 'lib/minjs/ecma262/lit.rb', line 267

def to_js(options = {})
  dq = @val.to_s.each_codepoint.select{|x| x == 0x22}.length
  sq = @val.to_s.each_codepoint.select{|x| x == 0x27}.length
  if dq <= sq
    t = "\""
  else
    t = "\'"
  end

  @val.to_s.each_codepoint do |c|
    if c == 0x5c
      t << ('\\\\')
    elsif c == 0x22 and dq <= sq
      t << ('\"')
    elsif c == 0x27 and dq > sq
      t << ('\\\'')
    elsif c >= 0x20 and c <= 0x7f
      t << ("%c" % c)
    elsif c == 8
      t << '\\b'
    elsif c == 9
      t << '\\t'
    elsif c == 0xa
      t << '\\n'
    elsif c == 0xb
      t << '\\v'
    elsif c == 0xc
      t << '\\v'
    elsif c == 0xd
      t << '\\r'
    elsif c == 0
      t << '\\0'
    elsif c < 0x20
      t << "\\x#{"%02x" % c}"
    else
      t << [c].pack("U*")
    end
  end
  if dq <= sq
    t << "\""
  else
    t << "\'"
  end
end

#traverse(parent) {|_self, parent| ... } ⇒ Object

Yields:

• (_self, parent)

Yield Parameters:

• _self (Minjs::ECMA262::ECMA262String) —

  the object that the method was called on

# File 'lib/minjs/ecma262/lit.rb', line 259

def traverse(parent)
  yield self, parent
end