'Regular expression denoting' presentation slideshows

Compiler Lexical Analysis

Compiler Lexical Analysis. ??? ???? ????????? xpqiu@fudan.edu.cn. References. http :// en.wikipedia.org/wiki/Comparison_of_parser_generators. Definitions. The lexical analyzer produces a certain token wherever the input contains a string of characters in a certain set of strings.

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CS 540 Spring 2013

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Lexical Analyzer

Lexical Analyzer. Second lecture. Outline. Informal sketch of lexical analysis Identifies tokens in input string Issues in lexical analysis Lookahead Ambiguities Specifying lexemes Regular expressions Examples of regular expressions. Lexical Analyzer. Functions

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Lexical Analysis - Scanner

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Lecture # 3

Lecture # 3. Chapter #3: Lexical Analysis. Role of Lexical Analyzer. It is the first phase of compiler Its main task is to read the input characters and produce as output a sequence of tokens that the parser uses for syntax analysis Reasons to make it a separate phase are:

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Review: Regular expression: How do we define it? Given an alphabet , Base case:

Review: Regular expression: How do we define it? Given an alphabet , Base case: is a regular expression that denote { }, the set that contains the empty string. For each , a is a regular expression denote {a}, the set containing the string a. Induction case:

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Specification of tokens using regular expressions

Specification of tokens using regular expressions. Strings and Languages An alphabet is any finite set of symbols. Examples of symbols are letters, digits, and punctuation. The set {0,1} is the binary alphabet.

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