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CS606 - Compiler Construction - Lecture Handout 34

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Let’s go through an example of using YACC to implement the ad-hoc scheme for an arithmetic calculator.

The YACC file for a calculator grammar is as follows:

%token NUMBER LPAREN RPAREN
%token PLUS MINUS TIMES DIVIDE
%%

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CS606 - Compiler Construction - Lecture Handout 24

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An LR(1) item is a pair [X → α•β, a] where X → αβ is a production and a∈T (terminals) is look-ahead symbol. The model uses a set of LR(1) items to represent each parser state. The model is called the canonical collection (CC) of set of LR(1) items.

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