Class: Gisele::Language::IfToCase

Inherits:
Sexpr::Rewriter
  • Object
show all
Defined in:
lib/gisele/language/processors/if_to_case.rb

Instance Method Summary collapse

Instance Method Details

#on_else_clause(sexpr) ⇒ Object 



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# File 'lib/gisele/language/processors/if_to_case.rb', line 40

def on_else_clause(sexpr)
  dost, = sexpr.sexpr_body

  # convert else to when and keep the markers
  base = \
    [:when_clause,
      [:bool_expr, @condition],
      apply(dost)]
  sexpr(base, sexpr.tracking_markers)
end

#on_elsif_clause(sexpr) ⇒ Object 



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# File 'lib/gisele/language/processors/if_to_case.rb', line 24

def on_elsif_clause(sexpr)
  condition, dost, = sexpr.sexpr_body

  # install new conditions for me and next elsif clauses
  condition = condition.last
  previous  = @condition
  @condition = [:bool_and, negate(condition), @condition]

  # convert elsif to when and keep the markers
  base = \
    [:when_clause,
      [:bool_expr, [:bool_and, condition, previous]],
      apply(dost) ]
  sexpr(base, sexpr.tracking_markers)
end

#on_if_st(sexpr) ⇒ Object 



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# File 'lib/gisele/language/processors/if_to_case.rb', line 6

def on_if_st(sexpr)
  condition, dost, *clauses = sexpr.sexpr_body

  # create case_st with same markers as the if_st
  when_clause = [:when_clause, condition, apply(dost)]
  when_clause = sexpr(when_clause, sexpr.tracking_markers)
  base        = [:case_st, nil, when_clause]
  base        = sexpr(base, sexpr.tracking_markers)

  # this is the condition for elsif clauses
  @condition = negate(condition.last)

  # make injection now
  clauses.inject base do |memo,clause|
    memo << apply(clause)
  end
end