You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
20 lines
633 B
20 lines
633 B
module Lox
|
|
class AstPrinter
|
|
def print(expr) = expr.accept(self)
|
|
|
|
def visit_binary(expr) = parenthesize(expr.op.lexeme, expr.left, expr.right)
|
|
def visit_grouping(expr) = parenthesize("group", expr.expr)
|
|
def visit_literal(expr) = expr.value&.to_s || "nil"
|
|
def visit_unary(expr) = parenthesize(expr.op.lexeme, expr.right)
|
|
|
|
def visit_print(expr) = parenthesize("print", expr.expr)
|
|
def visit_var(expr) = "(var #{expr.name.lexeme} #{expr.initializer.value})"
|
|
|
|
private
|
|
|
|
def parenthesize(name, *exprs)
|
|
"(#{name} #{exprs.map {|expr| expr.accept(self) }.join(" ")})"
|
|
end
|
|
end
|
|
end
|