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35 lines
795 B
35 lines
795 B
require_relative "environment"
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module Lox
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class Function
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def initialize(decl, closure, is_initializer)
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@decl, @closure, @is_initializer = decl, closure, is_initializer
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end
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def bind(instance)
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env = Environment.new(@closure)
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env.define("this", instance)
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Function.new(@decl, env, @is_initializer)
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end
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def arity = @decl.params.size
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def call(interpreter, args)
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env = Environment.new(@closure)
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@decl.params.map(&:lexeme).zip(args).each do |name, value|
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env.define(name, value)
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end
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return_value = catch(:return) {
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interpreter.execute_block(@decl.body, env)
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}
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return @closure.get_at(0, "this") if @is_initializer
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return_value
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end
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def to_s = "<fn #{@decl.name.lexeme}>"
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end
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end
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