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机械制造 > 清华大学：编译原理课件（英文译文）Chapter 3.5 Extended Notations：EBNFand Syntax Diagrams
清华大学：编译原理课件（英文译文）Chapter 3.5 Extended Notations：EBNFand Syntax Diagrams
Special Notations for Repetitive Constructs Repetition – A → A | (left recursive), and – A → A | (right recursive) where and are arbitrary strings of terminals and non-terminals, and – In the first rule does not begin with A and
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Examples The corresponding ebnf is exp>term addo term adop→+ term,factor! mulop factor ml0p→ factor→(ex) number, The corresponding syntax diagrams are given as follows: etp term dop
Examples • The corresponding EBNF is exp → term { addop term } addop→ + | - term → factor { mulop factor } mulop→ * factor → ( exp ) | numberr , • The corresponding syntax diagrams are given as follows: exp term term addop
Examples ter Actor mop ctor
Examples addop + - term factor factor mulop * mulop factor ( exp ) number
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