Lexical error - PowerPoint PPT Presentation

Lexical Analysis (2 Lectures)

Lexical Analysis (2 Lectures). Overview. Basic Concepts Regular Expressions Language Lexical analysis by hand Regular Languages Tools NFA DFA Scanning tools Lex / Flex / JFlex / ANTLR. Scanning Perspective. Purpose Transform a stream of symbols Into a stream of tokens.

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Implementing lexical analyzer using finite automation

Implementing lexical analyzer using finite automation. We are given the following regular definition: if -&gt; if then -&gt; then else -&gt; else relop -&gt; &lt;| &lt;=|=|&lt;&gt;|&gt;|&gt;= id -&gt; letter( letter|digit )* num -&gt; digit + (.digit + )? (E(+|-)?digit + )? letter -&gt; [a-z]|[A-Z]

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