抽象句法樹
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抽象句法樹(abstract syntax tree)係程式語言理論嘅分析當中成日用到嘅一種樹狀圖,用抽象化嘅方式嚟表達一段源碼。草泥马

while b ≠ 0
if a > b
a := a − b
else
b := b − a
return a}}
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