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编译原理PPT 第4章
CHAPTER 4 Syntax ANALYSIS Section 0 Approaches to implement a Syntax analyzer;CHAPTER 4 Syntax ANALYSIS Section 0 Approaches to implement a Syntax analyzer;CHAPTER 4 Syntax ANALYSIS Section 0 Approaches to implement a Syntax analyzer;CHAPTER 4 Syntax ANALYSIS Section 0 Approaches to implement a Syntax analyzer;CHAPTER 4 Syntax ANALYSIS Section 1 The Role of the Parser;CHAPTER 4 Syntax ANALYSIS Section 1 The Role of the Parser;CHAPTER 4 Syntax ANALYSIS Section 1 The Role of the Parser;CHAPTER 4 Syntax ANALYSIS Section 1 The Role of the Parser;CHAPTER 4 Syntax ANALYSIS Section 1 The Role of the Parser;CHAPTER 4 Syntax ANALYSIS Section 1 The Role of the Parser;CHAPTER 4 Syntax ANALYSIS Section 1 The Role of the Parser;CHAPTER 4 Syntax ANALYSIS Section 2 TOP-DOWN PARSING;CHAPTER 4 Syntax ANALYSIS Section 2 TOP-DOWN PARSING;CHAPTER 4 Syntax ANALYSIS Section 2 TOP-DOWN PARSING;CHAPTER 4 Syntax ANALYSIS Section 2 TOP-DOWN PARSING;Grammar for Parsing Example;Start;Applied Production;Applied Production;Applied Production;Applied Production;Start;Start;Start;Applied Production;Applied Production;Match
Input
Token!;Match
Input
Token!;Match
Input
Token!;Parsing Example;Backtracking Example;Applied Production;Applied Production;Applied Production;Applied Production;Applied Production;Applied Production;Applied Production;Term;Term;Match
Input
Token!;Match
Input
Token!;Left Recursion + Top-Down Parsing = Infinite Loop;CHAPTER 4 Syntax ANALYSIS Section 2 TOP-DOWN PARSING;CHAPTER 4 Syntax ANALYSIS Section 2 TOP-DOWN PARSING;CHAPTER 4 Syntax ANALYSIS Section 2 TOP-DOWN PARSING;CHAPTER 4 Syntax ANALYSIS Section 2 TOP-DOWN PARSING;Algorithm:
(1)Arrange the non-terminals in G in some order as P1,P2,…,Pn, do step 2 for each of them.
(2) for (i=1,i=n,i++)
{for (k=1,k=i-1,k++)
{replace each production of the form Pi ?Pk?
by Pi ??1 ? |? 2 ? |……| ?,n ?;
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