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 



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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