Class: SyntaxTree::YARV::ConcatStrings

Inherits:
Object
  • Object
show all
Defined in:
lib/syntax_tree/yarv/instructions.rb

Overview

### Summary

concatstrings pops a number of strings from the stack joins them together into a single string and pushes that string back on the stack.

This does no coercion and so is always used in conjunction with objtostring and anytostring to ensure the stack contents are always strings.

### Usage

~~~ruby “#5” ~~~

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(number) ⇒ ConcatStrings 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 773

def initialize(number)
  @number = number
end

Instance Attribute Details

#number ⇒ Object (readonly)

Returns the value of attribute number.



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# File 'lib/syntax_tree/yarv/instructions.rb', line 771

def number
  @number
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 789

def ==(other)
  other.is_a?(ConcatStrings) && other.number == number
end

#call(vm) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 809

def call(vm)
  vm.push(vm.pop(number).join)
end

#canonical ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 805

def canonical
  self
end

#deconstruct_keys(_keys) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 785

def deconstruct_keys(_keys)
  { number: number }
end

#disasm(fmt) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 777

def disasm(fmt)
  fmt.instruction("concatstrings", [fmt.object(number)])
end

#length ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 793

def length
  2
end

#pops ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 797

def pops
  number
end

#pushes ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 801

def pushes
  1
end

#to_a(_iseq) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 781

def to_a(_iseq)
  [:concatstrings, number]
end