Class: OrigenSTIL::Processor::Expression

Inherits:
Base
  • Object
show all
Defined in:
lib/origen_stil/processor/expression.rb

Overview

Evaluates an expression to a final answer

Instance Method Summary collapse

Methods inherited from Base

#handler_missing, #process

Instance Method Details

#on_add(node) ⇒ Object 



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# File 'lib/origen_stil/processor/expression.rb', line 59

def on_add(node)
  a, b = *process_all(node.children)
  a + b
end

#on_divide(node) ⇒ Object 



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# File 'lib/origen_stil/processor/expression.rb', line 54

def on_divide(node)
  a, b = *process_all(node.children)
  a / (b * 1.0)
end

#on_multiply(node) ⇒ Object 



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# File 'lib/origen_stil/processor/expression.rb', line 49

def on_multiply(node)
  a, b = *process_all(node.children)
  a * b
end

#on_number_with_unit(node) ⇒ Object 



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# File 'lib/origen_stil/processor/expression.rb', line 10

def on_number_with_unit(node)
  val = node.find(:value).value
  if p = node.find(:prefix)
    case p.value
    when 'E'
      val = val * 1_000_000_000_000_000_000
    when 'P'
      val = val * 1_000_000_000_000_000
    when 'T'
      val = val * 1_000_000_000_000
    when 'G'
      val = val * 1_000_000_000
    when 'M'
      val = val * 1_000_000
    when 'k'
      val = val * 1000
    when 'm'
      val = val / 1000.0
    when 'u'
      val = val / 1_000_000.0
    when 'n'
      val = val / 1_000_000_000.0
    when 'p'
      val = val / 1_000_000_000_000.0
    when 'f'
      val = val / 1_000_000_000_000_000.0
    when 'a'
      val = val / 1_000_000_000_000_000_000.0
    else
      fail "Unknown number prefix #{p.value}"
    end
  end
  val
end

#on_parens(node) ⇒ Object 



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# File 'lib/origen_stil/processor/expression.rb', line 45

def on_parens(node)
  process_all(node.children).first
end

#on_subtract(node) ⇒ Object 



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# File 'lib/origen_stil/processor/expression.rb', line 64

def on_subtract(node)
  a, b = *process_all(node.children)
  a - b
end

#run(node, options = {}) ⇒ Object

Given node should be a top-level expression node, like a :time_expr



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# File 'lib/origen_stil/processor/expression.rb', line 6

def run(node, options = {})
  process(node).value
end