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An Implementation Guide to Compiler Writing - download pdf or read online

By Jean-Paul Tremblay

ISBN-10: 0070651663

ISBN-13: 9780070651661

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The axioms of Boolean algebra follow next. Associativity. Commutativity. Distributivity. (1) a or (b or c) = (a or b) or c, and (2) a and (b and c) = (a and b) and c, for all a, b, c ∈ Σ. (1) a or b = b or a, and (2) a and b = b and a, for all a, b ∈ Σ. (1) a and (b or c) = (a and b) or (a and c), and (2) a or (b and c) = (a or b) and (a or c), for all a, b ∈ Σ. In addition, Σ contains two distinguished members, 0 and 1, which satisfy these laws for all a ∈ Σ, 1 Introduction 19 (1) a or 0 = a, (2) a and 1 = a, (3) a or (not a) = 1, and (4) a and (not a) = 0.

1 discusses the fundamental language models underlying the lexical analysis. 2 describes methods and techniques used in this analysis. 3 presents the theoretical background of lexical analysis. 1 Models This chapter describes these fundamental models behind lexical analysis • regular expressions • finite automata and finite transducers Regular expressions represent simple language-denoting formulas, based upon the operations of concatenation, union, and iteration. These expressions are used to specify programming language lexemes.

Notice that each of them sets token to the token that specifies the recognized lexeme. i-P. 20). As explained above, the FUN symbol-table handler provides the scanner with the symbol-table address )x. Notice that procedure FUN-scanner has already a letter in character when it calls i-P, whose description follows next. procedure i-P; begin repeat lexeme := lexeme⋅character; {concatenate the string in lexeme and the character in character} INPUT-CHARACTER until character ∉ letter ∪ digit; {exit when a non-alphanumeric symbol is read} RETURN-CHARACTER; {the non-alphanumeric symbol in character is pushed back onto the standard input} if lexeme contains a FUN keyword {the symbol-table handler determines this} then token := lexeme {the token of every keyword is the keyword itself; for instance, if is the token of if} else begin token := i{)x}, where x is the identifier contained in lexeme; report whether x already existed in the symbol table to the FUN parser {the symbol-table handler provides )x as well as the information whether x was previously stored in the symbol table} end end l-P.

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An Implementation Guide to Compiler Writing by Jean-Paul Tremblay

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