gistfile1.tex

\documentclass[a4paper,11pt]{article}
\usepackage[english]{babel}
\usepackage{amsmath,amssymb,cancel,array,graphics,enumerate,fancyhdr,graphviz,psfrag,minted}
\usepackage{ucs}
\usepackage[utf8x]{inputenc}

\title{}
\author{Samuel Marks}

\begin{document}
%\maketitle

\section{Lexical analyser}
\ \\[5mm]
\digraph[scale=1.0]{lexicalAnalyserOverview} {
    rankdir=LR;
    
     Regex->NDFA
     subgraph cluster0 {
         label="scanner generator";
        NDFA->DFA
     };
     DFA->Program
}

\section{Scanner generator}
\begin{enumerate}
    \item Flex \(\rightarrow\) generates C program \(\rightarrow\) \emph{lex.yy.c}
    \item JLex \(\rightarrow\) generates Java program
\end{enumerate}

\subsection{Flex example}
\begin{minted}{text}
    %%
    // definition section
    #include     <stdio.h>
    DIGIT        [0-9]
    NUMBER       0 | [1-9][DIGIT]*
    IDENTIFIER   [a-z A-Z][a-z A-Z 0-9]*
    %%
    //Rules section
    RE           ACTION
    DIGIT        { printf("Digit Found: %s\n", yy_text); }
    
    IDENTIFIER   { populateSymbolTable(yy_text); }
    
    %%

    //User action
    void populateSymbolTable();
    main() {
        while(yy_lex())
            printf("Token found: %s\n", yy_text);
    }
\end{minted}

\end{document}