Class: SyntaxTree::YARV::ConcatStrings

Inherits:
Instruction 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

Methods inherited from Instruction

#branch_targets, #canonical, #falls_through?, #leaves?, #side_effects?

Constructor Details

#initialize(number) ⇒ ConcatStrings

Returns a new instance of ConcatStrings.



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# File 'lib/syntax_tree/yarv/instructions.rb', line 723

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 721

def number
  @number
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 739

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 755

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

#deconstruct_keys(_keys) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 735

def deconstruct_keys(_keys)
  { number: number }
end

#disasm(fmt) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 727

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

#length ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 743

def length
  2
end

#pops ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 747

def pops
  number
end

#pushes ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 751

def pushes
  1
end

#to_a(_iseq) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 731

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