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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\documentclass[dvipsnames,14pt,t,xelatex]{beamer}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\usepackage{beamerthemeplaincu}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\usepackage{fontenc,xltxtra,xunicode}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\defaultfontfeatures{Mapping=tex-text}
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\usepackage{mathpartir}
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\usepackage[absolute,overlay]{textpos}
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\usepackage{ifthen}
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\usepackage{tikz}
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\usepackage{pgf}
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\usepackage{calc}
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\usepackage{ulem}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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%%\usepackage{courier}
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\usepackage{listings}
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\renewcommand{\uline}[1]{#1}
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\usetikzlibrary{arrows}
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\usetikzlibrary{automata}
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\usetikzlibrary{shapes}
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\usetikzlibrary{shadows}
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\usetikzlibrary{positioning}
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\usetikzlibrary{calc}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\usetikzlibrary{plotmarks}
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\usepackage{graphicx}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\usepackage{pgfplots}
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\definecolor{javared}{rgb}{0.6,0,0} % for strings
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\definecolor{javagreen}{rgb}{0.25,0.5,0.35} % comments
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\definecolor{javapurple}{rgb}{0.5,0,0.35} % keywords
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\definecolor{javadocblue}{rgb}{0.25,0.35,0.75} % javadoc
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\makeatletter
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\lst@CCPutMacro\lst@ProcessOther {"2D}{\lst@ttfamily{-{}}{-{}}}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\@empty\z@\@empty
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\makeatother
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\lstset{language=Java,
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basicstyle=\ttfamily,
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keywordstyle=\color{javapurple}\bfseries,
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stringstyle=\color{javagreen},
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commentstyle=\color{javagreen},
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morecomment=[s][\color{javadocblue}]{/**}{*/},
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numbers=left,
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numberstyle=\tiny\color{black},
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stepnumber=1,
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numbersep=10pt,
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tabsize=2,
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showspaces=false,
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showstringspaces=false}
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\lstdefinelanguage{scala}{
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morekeywords={abstract,case,catch,class,def,%
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do,else,extends,false,final,finally,%
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for,if,implicit,import,match,mixin,%
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new,null,object,override,package,%
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private,protected,requires,return,sealed,%
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super,this,throw,trait,true,try,%
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type,val,var,while,with,yield},
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otherkeywords={=>,<-,<\%,<:,>:,\#,@},
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sensitive=true,
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morecomment=[l]{//},
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morecomment=[n]{/*}{*/},
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morestring=[b]",
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morestring=[b]',
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morestring=[b]"""
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}
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\lstset{language=Scala,
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basicstyle=\ttfamily,
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keywordstyle=\color{javapurple}\bfseries,
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stringstyle=\color{javagreen},
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commentstyle=\color{javagreen},
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morecomment=[s][\color{javadocblue}]{/**}{*/},
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numbers=left,
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numberstyle=\tiny\color{black},
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stepnumber=1,
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numbersep=10pt,
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tabsize=2,
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showspaces=false,
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showstringspaces=false}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\begin{filecontents}{interpreted2.data}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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%1 0.00503
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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200 1.005863
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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400 7.8296765
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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600 27.2321885
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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800 65.249271
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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1000 135.4493445
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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1200 232.134097
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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1400 382.527227
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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90 |
\end{filecontents}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\begin{filecontents}{compiled2.data}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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200 0.222058
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
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94 |
400 0.215204
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
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95 |
600 0.202031
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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changeset
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96 |
800 0.21986
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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changeset
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97 |
1000 0.205934
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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98 |
1200 0.1981615
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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1400 0.207116
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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100 |
\end{filecontents}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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% beamer stuff
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97
Christian Urban <christian dot urban at kcl dot ac dot uk>
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\renewcommand{\slidecaption}{AFL 01, King's College London, 25.~September 2013}
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\begin{document}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}<1>[t]
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\frametitle{%
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\begin{tabular}{@ {}c@ {}}
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\\[-3mm]
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\LARGE Automata and \\[-2mm]
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\LARGE Formal Languages (1)\\[-3mm]
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\end{tabular}}
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\begin{center}
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\includegraphics[scale=0.3]{pics/ante1.jpg}\hspace{5mm}
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\includegraphics[scale=0.31]{pics/ante2.jpg}\\
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\footnotesize\textcolor{gray}{Antikythera automaton, 100 BC (Archimedes?)}
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\end{center}
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\normalsize
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\begin{center}
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\begin{tabular}{ll}
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Email: & christian.urban at kcl.ac.uk\\
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95
Christian Urban <christian dot urban at kcl dot ac dot uk>
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Office: & S1.27 (1st floor Strand Building)\\
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Slides: & KEATS
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\end{tabular}
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\end{center}
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}[c]
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\begin{textblock}{1}(2,5)
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\begin{tabular}{c}
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\includegraphics[scale=0.15]{pics/servers.png}\\[-2mm]
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\small Server
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\end{tabular}
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\end{textblock}
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\begin{textblock}{1}(5.6,4)
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\begin{tikzpicture}[scale=1.1]
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\draw[white] (0,1) node (X) {};
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\draw[white] (2,1) node (Y) {};
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\draw[white] (0,0) node (X1) {};
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\draw[white] (2,0) node (Y1) {};
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\draw[white] (0,-1) node (X2) {};
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\draw[white] (2,-1) node (Y2) {};
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\draw[red, <-, line width = 2mm] (X) -- (Y);
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\node [inner sep=5pt,label=above:\textcolor{black}{GET request}] at ($ (X)!.5!(Y) $) {};
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\draw[red, ->, line width = 2mm] (X1) -- (Y1);
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\node [inner sep=5pt,label=above:\textcolor{black}{webpage}] at ($ (X1)!.5!(Y1) $) {};
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\draw[red, <-, line width = 2mm] (X2) -- (Y2);
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\node [inner sep=7pt,label=above:\textcolor{black}{POST data}] at ($ (X2)!.5!(Y2) $) {};
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\end{tikzpicture}
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\end{textblock}
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\begin{textblock}{1}(9,5.5)
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\begin{tabular}{c}
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\includegraphics[scale=0.15]{pics/laptop.png}\\[-2mm]
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\small Browser
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\end{tabular}
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\end{textblock}
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\only<2>{
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\begin{textblock}{10}(2,13.5)
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\begin{itemize}
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\item programming languages, compilers
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\end{itemize}
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\end{textblock}}
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}[c]
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transforming strings into structured data\\[10mm]
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{\LARGE\bf Lexing}\medskip\\
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\hspace{5mm}(recognising ``words'')\\[6mm]
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{\LARGE\bf Parsing}\medskip\\
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\hspace{5mm}(recognising ``sentences'')
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}[c]
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The subject is quite old:
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\begin{itemize}
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\item Turing Machines, 1936
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\item first compiler for COBOL, 1957 (Grace Hopper)
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\item but surprisingly research papers are still published now
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\end{itemize}
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\begin{flushright}
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\includegraphics[scale=0.3]{pics/hopper.jpg}\\
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\footnotesize\textcolor{gray}{Grace Hopper}
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\end{flushright}
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{\footnotesize\textcolor{gray}{(she made it to David Letterman's Tonight Show, \url{http://www.youtube.com/watch?v=aZOxtURhfEU})}}
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}[c]
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\frametitle{\begin{tabular}{c}This Course\end{tabular}}
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\begin{itemize}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\item the ultimate goal is to implement a small compiler (a really small one for the JVM)\bigskip
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\end{itemize}
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Let's start with:
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\begin{itemize}
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\item a web-crawler
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\item an email harvester
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\item a web-scraper
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\end{itemize}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\begin{textblock}{6}(10,7)
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\begin{tikzpicture}[scale=0.38]
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\begin{axis}[axis x line=bottom, axis y line=left, ylabel=secs,
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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xlabel=n,
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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enlargelimits=0.05,
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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ybar interval=0.7, legend style=small]
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\addplot file {interpreted2.data};
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\addplot file {compiled2.data};
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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%\legend{interpreted, compiled}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\end{axis}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\end{tikzpicture}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\end{textblock}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}[t]
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\frametitle{\begin{tabular}{c}A Web-Crawler\end{tabular}}
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\mbox{}\\[10mm]
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\begin{enumerate}
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\item given an URL, read the corresponding webpage
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\item extract all links from it
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\item call the web-crawler again for all these links
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\end{enumerate}
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}[t]
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\frametitle{\begin{tabular}{c}A Web-Crawler\end{tabular}}
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\mbox{}\\[10mm]
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\begin{enumerate}
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\item given an URL, read the corresponding webpage
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\item if not possible print, out a problem
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\item if possible, extract all links from it
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\item call the web-crawler again for all these links
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\end{enumerate}\bigskip\pause
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\small (we need a bound for the number of recursive calls)
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\small (the purpose is to check all links on my own webpage)
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}[c]
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\frametitle{\begin{tabular}{c}Scala\end{tabular}}
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|
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
298 |
\small a simple Scala function for reading webpages\\[-3mm]
|
|
0
|
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|
98
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
300 |
\footnotesize
|
97
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
301 |
{\lstset{language=Scala}\texttt{\lstinputlisting{../progs/app0.scala}}}\pause
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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{\lstset{language=Scala}\texttt{\lstinline{get_page("""http://www.inf.kcl.ac.uk/staff/urbanc/""")}}}\pause\bigskip
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0
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3
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\small slightly more complicated for handling errors properly:\\[-3mm]
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2
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
307 |
\footnotesize
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
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{\lstset{language=Scala}\texttt{\lstinputlisting{../progs/app1.scala}}}
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1
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0
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\begin{frame}[c]
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\frametitle{\begin{tabular}{c}Why Scala?\end{tabular}}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
318 |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\begin{textblock}{6}(1,3)
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
320 |
\begin{tabular}{l}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
321 |
\mbox{}\hspace{-1mm}\includegraphics[scale=0.36]{pics/twitter.png}\\[-1mm]
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
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\includegraphics[scale=0.30]{pics/linked.png}\\
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
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\includegraphics[scale=0.30]{pics/guardian.jpg}\\[-3mm]
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
324 |
\mbox{}\hspace{-2mm}\includegraphics[scale=0.38]{pics/morgan.png}\\[-3mm]
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
325 |
\includegraphics[scale=0.30]{pics/suisse.png}\\
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
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\includegraphics[scale=0.20]{pics/edf.png}\\[-1mm]
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
327 |
\includegraphics[scale=0.08]{pics/novell.png}\\[-1mm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
328 |
\includegraphics[scale=0.30]{pics/foursquare.png}\\
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
329 |
\includegraphics[scale=0.30]{pics/hsbc.png}\\
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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changeset
|
330 |
{\large\bf ...}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
331 |
\end{tabular}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
332 |
\end{textblock}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
333 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
334 |
\only<2->{
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
335 |
\begin{textblock}{6}(6,3)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
336 |
\includegraphics[scale=0.35]{pics/jobgraph.png}\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
337 |
\end{textblock}}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
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338 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
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\only<3->{
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
340 |
\begin{textblock}{6}(7.3,9.2)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
341 |
\begin{tabular}{l}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
342 |
\footnotesize 2013: 1$\%$\\[-2mm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
343 |
\footnotesize 2014: 3$\%$\\[-2mm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
344 |
\footnotesize 2015: 9$\%$\\[-2mm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
345 |
\footnotesize 2016: 27$\%$\\[-2mm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
346 |
\footnotesize 2017: 81$\%$\\[-2mm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
347 |
\footnotesize 2018: 243$\%$ \raisebox{-1mm}{\includegraphics[scale=0.02]{pics/smiley.jpg}}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
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|
348 |
\end{tabular}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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changeset
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349 |
\end{textblock}}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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350 |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
351 |
\only<3->{
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
352 |
\begin{textblock}{6}(6,9.5)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
353 |
\footnotesize 5 yrs $\begin{cases}\mbox{}\\[1.4cm]\end{cases}$
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
354 |
\end{textblock}}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
355 |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
356 |
\only<4->{
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
357 |
\begin{textblock}{11}(5,14.1)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
358 |
\textcolor{gray}{
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
359 |
\footnotesize {\bf in London today:} 1 Scala job for every 30 Java jobs;\\[-2mm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
360 |
Scala programmers seem to get up to 20\% better salary}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
361 |
\end{textblock}}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
362 |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
363 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
364 |
\only<5->{
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
365 |
\begin{textblock}{1}(3,6)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
366 |
\begin{tikzpicture}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
367 |
\draw (0,0) node[inner sep=2mm,fill=cream, ultra thick, draw=red, rounded corners=2mm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
368 |
{\normalsize\color{darkgray}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
369 |
\begin{minipage}{8.5cm}\raggedright\normalsize
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
370 |
Scala is a functional and object-oriented programming language; compiles to the JVM; does not
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
371 |
need null-pointer exceptions; a course on Coursera\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
372 |
\mbox{}\hfill\textcolor{blue}{\url{http://www.scala-lang.org}}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
373 |
\end{minipage}};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
374 |
\end{tikzpicture}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
375 |
\end{textblock}}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
376 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
377 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
378 |
\end{frame}}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
379 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
380 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
381 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
382 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
383 |
\mode<presentation>{
|
|
3
|
384 |
\begin{frame}[t]
|
|
|
385 |
\frametitle{\begin{tabular}{c}A Regular Expression\end{tabular}}
|
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|
386 |
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|
387 |
\begin{itemize}
|
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|
388 |
\item \ldots{} is a pattern or template for specifying strings
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389 |
\end{itemize}\bigskip
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|
390 |
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|
391 |
\begin{center}
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|
392 |
\only<1>{{\lstset{language=Scala}\fontsize{18}{19}\selectfont\bf
|
|
|
393 |
\texttt{"https?://[$\hat{\hspace{2mm}}$"]*"}}}%
|
|
|
394 |
\only<2>{{\lstset{language=Scala}\fontsize{18}{19}\selectfont\bf
|
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|
395 |
\texttt{"""\textbackslash{}"https?://[$\hat{\hspace{2mm}}$\textbackslash{}"]*\textbackslash{}"""".r}}}
|
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|
396 |
\end{center}\bigskip\bigskip
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|
397 |
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|
398 |
matches for example\\
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|
399 |
\;{\lstset{language=Scala}\fontsize{12}{14}\selectfont\bf
|
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|
400 |
\texttt{"http://www.foobar.com"}}\\
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|
401 |
\;{\lstset{language=Scala}\fontsize{12}{14}\selectfont\bf
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402 |
\texttt{"https://www.tls.org"}}\\
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403 |
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404 |
\end{frame}}
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|
405 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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|
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407 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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408 |
\mode<presentation>{
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0
|
409 |
\begin{frame}[c]
|
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410 |
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|
3
|
411 |
{\lstset{language=Scala}\fontsize{18}{19}\selectfont\bf
|
|
|
412 |
\texttt{rexp.findAllIn(string)}}\medskip
|
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|
413 |
|
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|
414 |
returns a list of all (sub)strings that match the regular expression\bigskip\bigskip
|
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|
415 |
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|
416 |
{\lstset{language=Scala}\fontsize{18}{19}\selectfont\bf
|
|
|
417 |
\texttt{rexp.findFirstIn(string)}}\medskip
|
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|
418 |
|
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|
419 |
returns either {\bf\texttt{None}} if no (sub)string matches
|
|
|
420 |
or {\bf\texttt{Some(s)}} with the first (sub)string
|
|
0
|
421 |
|
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|
422 |
\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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427 |
\begin{frame}[c]
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428 |
|
97
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
429 |
\small
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
430 |
{\lstset{language=Scala}\texttt{\lstinputlisting{../progs/app2.scala}}}\medskip
|
|
0
|
431 |
|
97
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
432 |
{\lstset{language=Scala}\texttt{crawl(some\_start\_URL, 2)}}\
|
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0
|
433 |
|
|
|
434 |
\end{frame}}
|
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|
435 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
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|
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
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|
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\mode<presentation>{
|
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3
|
439 |
\begin{frame}[c]
|
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0
|
440 |
|
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3
|
441 |
\footnotesize
|
|
|
442 |
a version that only ``crawls'' links in my domain:
|
|
0
|
443 |
|
97
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
444 |
\small
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
445 |
{\lstset{language=Scala}\texttt{\lstinputlisting{../progs/app3.scala}}}
|
|
0
|
446 |
|
|
|
447 |
|
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|
448 |
\end{frame}}
|
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|
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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|
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
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|
452 |
\mode<presentation>{
|
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|
453 |
\begin{frame}[c]
|
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3
|
454 |
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|
455 |
\footnotesize
|
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|
456 |
a little email ``harvester'':
|
|
|
457 |
|
97
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
458 |
\small
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
459 |
{\lstset{language=Scala}\texttt{\lstinputlisting{../progs/app4.scala}}}\bigskip
|
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3
|
460 |
|
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|
461 |
\tiny
|
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|
462 |
\textcolor{gray}{\url{http://net.tutsplus.com/tutorials/other/8-regular-expressions-you-should-know/}}
|
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463 |
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|
464 |
\end{frame}}
|
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|
465 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
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466 |
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|
467 |
\newcommand{\bl}[1]{\textcolor{blue}{#1}}
|
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|
468 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
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|
469 |
\mode<presentation>{
|
|
14
|
470 |
\begin{frame}[t]
|
|
3
|
471 |
\frametitle{\begin{tabular}{c}Regular Expressions\end{tabular}}
|
|
0
|
472 |
|
|
14
|
473 |
Their inductive definition:\medskip
|
|
|
474 |
|
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|
475 |
\begin{textblock}{6}(2,5)
|
|
3
|
476 |
\begin{tabular}{@ {}rrl@ {\hspace{13mm}}l}
|
|
|
477 |
\bl{r} & \bl{$::=$} & \bl{$\varnothing$} & null\\
|
|
5
|
478 |
& \bl{$\mid$} & \bl{$\epsilon$} & empty string / "" / []\\
|
|
3
|
479 |
& \bl{$\mid$} & \bl{c} & character\\
|
|
|
480 |
& \bl{$\mid$} & \bl{r$_1$ $\cdot$ r$_2$} & sequence\\
|
|
|
481 |
& \bl{$\mid$} & \bl{r$_1$ + r$_2$} & alternative / choice\\
|
|
|
482 |
& \bl{$\mid$} & \bl{r$^*$} & star (zero or more)\\
|
|
|
483 |
\end{tabular}
|
|
|
484 |
\end{textblock}
|
|
|
485 |
|
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|
486 |
\end{frame}}
|
|
|
487 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
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488 |
|
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|
489 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
490 |
\mode<presentation>{
|
|
|
491 |
\begin{frame}[t]
|
|
|
492 |
\frametitle{\begin{tabular}{c}Regular Expressions\end{tabular}}
|
|
|
493 |
|
|
14
|
494 |
\small
|
|
|
495 |
In Scala:
|
|
|
496 |
|
|
|
497 |
|
|
3
|
498 |
{\lstset{language=Scala}\fontsize{8}{10}\selectfont
|
95
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
499 |
\texttt{\lstinputlisting{../progs/app51.scala}}}
|
|
0
|
500 |
|
|
|
501 |
|
|
|
502 |
\end{frame}}
|
|
|
503 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
504 |
|
|
3
|
505 |
\newcommand{\dn}{\stackrel{\mbox{\scriptsize def}}{=}}% for definitions
|
|
0
|
506 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
507 |
\mode<presentation>{
|
|
|
508 |
\begin{frame}[c]
|
|
3
|
509 |
\frametitle{\begin{tabular}{c}The Meaning of a\\[-2mm] Regular Expression\end{tabular}}
|
|
0
|
510 |
|
|
4
|
511 |
\begin{textblock}{15}(1,4)
|
|
3
|
512 |
\begin{tabular}{@ {}rcl}
|
|
|
513 |
\bl{$L$($\varnothing$)} & \bl{$\dn$} & \bl{$\varnothing$}\\
|
|
|
514 |
\bl{$L$($\epsilon$)} & \bl{$\dn$} & \bl{$\{$""$\}$}\\
|
|
|
515 |
\bl{$L$(c)} & \bl{$\dn$} & \bl{$\{$"c"$\}$}\\
|
|
|
516 |
\bl{$L$(r$_1$ + r$_2$)} & \bl{$\dn$} & \bl{$L$(r$_1$) $\cup$ $L$(r$_2$)}\\
|
|
4
|
517 |
\bl{$L$(r$_1$ $\cdot$ r$_2$)} & \bl{$\dn$} & \bl{$\{$ s$_1$ @ s$_2$ $|$ s$_1$ $\in$ $L$(r$_1$) $\wedge$ s$_2$ $\in$
|
|
|
518 |
$L$(r$_2$) $\}$}\\
|
|
5
|
519 |
\bl{$L$(r$^*$)} & \bl{$\dn$} & \onslide<4->{\bl{$\bigcup_{n \ge 0}$ $L$(r)$^n$}}\\
|
|
4
|
520 |
\end{tabular}\bigskip
|
|
3
|
521 |
|
|
4
|
522 |
\onslide<2->{
|
|
|
523 |
\hspace{5mm}\bl{$L$(r)$^0$ $\;\dn\;$ $\{$""$\}$}\\
|
|
5
|
524 |
\bl{$L$(r)$^{n+1}$ $\;\dn\;$ $L$(r) @ $L$(r)$^n$}\hspace{9mm}\onslide<3->{\small\textcolor{gray}{(append on sets)}\\
|
|
|
525 |
\small\hspace{5cm}\textcolor{gray}{$\{$ s$_1$ @ s$_2$ $|$ s$_1$ $\in$ $L$(r) $\wedge$ s$_2$ $\in$
|
|
|
526 |
$L$(r)$^n$ $\}$}}
|
|
4
|
527 |
}
|
|
|
528 |
\end{textblock}
|
|
|
529 |
|
|
0
|
530 |
\end{frame}}
|
|
|
531 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
532 |
|
|
5
|
533 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
534 |
\mode<presentation>{
|
|
|
535 |
\begin{frame}[c]
|
|
8
|
536 |
\frametitle{\begin{tabular}{c}The Meaning of Matching\end{tabular}}
|
|
5
|
537 |
|
|
|
538 |
\large
|
|
|
539 |
a regular expression \bl{r} matches a string \bl{s} is defined as
|
|
|
540 |
|
|
|
541 |
\begin{center}
|
|
|
542 |
\bl{s $\in$ $L$(r)}\\
|
|
|
543 |
\end{center}
|
|
|
544 |
|
|
|
545 |
\end{frame}}
|
|
|
546 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
547 |
|
|
3
|
548 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
549 |
\mode<presentation>{
|
|
|
550 |
\begin{frame}[c]
|
|
|
551 |
\frametitle{\begin{tabular}{c}This Course\end{tabular}}
|
|
|
552 |
|
|
7
|
553 |
We will have a look at:
|
|
3
|
554 |
|
|
|
555 |
\begin{itemize}
|
|
7
|
556 |
\item regular expressions / regular expression matching
|
97
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
557 |
\item derivatives
|
|
3
|
558 |
\item automata
|
|
|
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\item parsing
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560 |
\item grammars
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97
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
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\item a small interpreter / compiler
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3
|
562 |
\end{itemize}
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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0
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}[c]
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\frametitle{\begin{tabular}{c}Exam\end{tabular}}
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0
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\begin{itemize}
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7
|
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\item The question ``Is this relevant for the exam?'' is not appreciated!\bigskip\\
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0
|
576 |
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14
|
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Whatever is in the homework sheets (and is not marked ``optional'') is relevant for the
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exam.\\ No code needs to be written in the exam.
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0
|
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\end{itemize}
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\end{document}
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%%% Local Variables:
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%%% mode: latex
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%%% TeX-master: t
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%%% End:
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