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27 lines
736 B
27 lines
736 B
module Lox
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class AstPrinter
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def print(expr) = expr.accept(self)
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def visit_binary(expr) = parenthesize(expr.op.lexeme, expr.left, expr.right)
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def visit_grouping(expr) = parenthesize("group", expr.expr)
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def visit_literal(expr) = expr.value&.to_s || "nil"
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def visit_unary(expr) = parenthesize(expr.op.lexeme, expr.right)
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def visit_print(expr) = parenthesize("print", expr.expr)
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def visit_var(expr)
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if init = expr.initializer
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"(assign #{expr.name.lexeme} #{expr.initializer.value})"
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else
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"(var #{expr.name.lexeme})"
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end
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end
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private
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def parenthesize(name, *exprs)
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"(#{name} #{exprs.map {|expr| expr.accept(self) }.join(" ")})"
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end
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end
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end
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