| author | Christian Urban <christian dot urban at kcl dot ac dot uk> |
| Sun, 21 Sep 2014 17:40:04 +0100 | |
| changeset 253 | 75c469893514 |
| parent 252 | e8ef8f38ca84 |
| child 254 | dcd4688690ce |
| permissions | -rw-r--r-- |
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\documentclass[dvipsnames,14pt,t,xelatex]{beamer}
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\usepackage{../slides}
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\usepackage{../graphics}
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\usepackage{../langs}
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\usepackage{../data}
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\hfuzz=220pt |
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\newcommand{\bl}[1]{\textcolor{blue}{#1}}
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% beamer stuff |
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\renewcommand{\slidecaption}{AFL 01, King's College London}
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\begin{document}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[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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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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\begin{frame}[c]
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\begin{textblock}{1}(2,5)
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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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\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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\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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\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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\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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\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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\begin{textblock}{6}(10,7)
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\begin{tikzpicture}[scale=0.38]
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\begin{axis}[axis x line=bottom, axis y line=left, ylabel=secs,
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xlabel=n, |
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enlargelimits=0.05, |
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ybar interval=0.7, legend style=small] |
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\addplot file {interpreted2.data};
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\addplot file {compiled2.data};
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%\legend{interpreted, compiled}
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\end{axis}
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\end{tikzpicture}
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\end{textblock}
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[t]
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\frametitle{A Web-Crawler}
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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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\mode<presentation>{
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\begin{frame}[t]
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\frametitle{A Web-Crawler}
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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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\begin{frame}[c]
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\frametitle{Scala}
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\small a simple Scala function for reading webpages |
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\footnotesize |
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\lstinputlisting{../progs/app0.scala}\pause
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\lstinline{get_page("""http://www.inf.kcl.ac.uk/staff/urbanc/""")}\pause\bigskip
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\small slightly more complicated for handling errors properly: |
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\footnotesize |
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\lstinputlisting{../progs/app1.scala}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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\frametitle{Why Scala?}
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\begin{textblock}{6}(1,3)
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\begin{tabular}{l}
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\mbox{}\hspace{-1mm}\includegraphics[scale=0.36]{pics/twitter.png}\\[-1mm]
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\includegraphics[scale=0.30]{pics/linked.png}\\
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\includegraphics[scale=0.30]{pics/guardian.jpg}\\[-3mm]
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\mbox{}\hspace{-2mm}\includegraphics[scale=0.38]{pics/morgan.png}\\[-3mm]
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\includegraphics[scale=0.30]{pics/suisse.png}\\
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\includegraphics[scale=0.20]{pics/edf.png}\\[-1mm]
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\includegraphics[scale=0.08]{pics/novell.png}\\[-1mm]
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\includegraphics[scale=0.30]{pics/foursquare.png}\\
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\includegraphics[scale=0.30]{pics/hsbc.png}\\
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{\large\bf ...}
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\end{tabular}
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\end{textblock}
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\only<2->{
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\begin{textblock}{6}(6,3)
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\includegraphics[scale=0.35]{pics/jobgraph.png}\\
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\end{textblock}}
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\only<3->{
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\begin{textblock}{6}(7.3,9.2)
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\begin{tabular}{l}
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\footnotesize 2013: 1$\%$\\[-2mm] |
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\footnotesize 2014: 3$\%$\\[-2mm] |
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updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
245 |
\footnotesize 2015: 9$\%$\\[-2mm] |
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
246 |
\footnotesize 2016: 27$\%$\\[-2mm] |
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
247 |
\footnotesize 2017: 81$\%$\\[-2mm] |
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
248 |
\footnotesize 2018: 243$\%$ \raisebox{-1mm}{\includegraphics[scale=0.02]{pics/smiley.jpg}}
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
249 |
\end{tabular}
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
250 |
\end{textblock}}
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
251 |
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
252 |
\only<3->{
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
253 |
\begin{textblock}{6}(6,9.5)
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
254 |
\footnotesize 5 yrs $\begin{cases}\mbox{}\\[1.4cm]\end{cases}$
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
255 |
\end{textblock}}
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
256 |
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
257 |
\only<4->{
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
258 |
\begin{textblock}{11}(5,14.1)
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
259 |
\textcolor{gray}{
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
260 |
\footnotesize {\bf in London today:} 1 Scala job for every 30 Java jobs;\\[-2mm]
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
261 |
Scala programmers seem to get up to 20\% better salary} |
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
262 |
\end{textblock}}
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
263 |
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
264 |
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
265 |
\only<5->{
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
266 |
\begin{textblock}{1}(3,6)
|
|
253
75c469893514
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parents:
252
diff
changeset
|
267 |
\begin{bubble}[8.5cm]
|
|
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parents:
252
diff
changeset
|
268 |
\normalsize |
|
75c469893514
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parents:
252
diff
changeset
|
269 |
Scala is a functional and object-oriented programming |
|
75c469893514
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parents:
252
diff
changeset
|
270 |
language; compiles to the JVM; does not need null-pointer |
|
75c469893514
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parents:
252
diff
changeset
|
271 |
exceptions; a course on Coursera\\ |
|
75c469893514
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Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
272 |
\mbox{}\hfill\url{http://www.scala-lang.org}
|
|
75c469893514
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parents:
252
diff
changeset
|
273 |
\end{bubble}
|
|
98
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
274 |
\end{textblock}}
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
275 |
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
276 |
\end{frame}
|
|
98
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
277 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
278 |
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
279 |
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
280 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 3 | 281 |
\begin{frame}[t]
|
|
253
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parents:
252
diff
changeset
|
282 |
\frametitle{A Regular Expression}
|
| 3 | 283 |
|
284 |
\begin{itemize}
|
|
285 |
\item \ldots{} is a pattern or template for specifying strings
|
|
286 |
\end{itemize}\bigskip
|
|
287 |
||
288 |
\begin{center}
|
|
|
253
75c469893514
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parents:
252
diff
changeset
|
289 |
\only<1>{\code{"https?://[^\"]*"}}%
|
|
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parents:
252
diff
changeset
|
290 |
\only<2>{\code{""""https?://[^\"]*"""".r}}
|
| 3 | 291 |
\end{center}\bigskip\bigskip
|
292 |
||
293 |
matches for example\\ |
|
|
253
75c469893514
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parents:
252
diff
changeset
|
294 |
\code{"http://www.foobar.com"}\\
|
|
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parents:
252
diff
changeset
|
295 |
\code{"https://www.tls.org"}\\
|
| 3 | 296 |
|
|
253
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parents:
252
diff
changeset
|
297 |
\end{frame}
|
| 3 | 298 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
299 |
||
300 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
| 0 | 301 |
\begin{frame}[c]
|
302 |
||
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
303 |
\code{rexp.findAllIn(string)}\medskip
|
| 3 | 304 |
|
|
253
75c469893514
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parents:
252
diff
changeset
|
305 |
returns a list of all (sub)strings that match the |
|
75c469893514
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Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
306 |
regular expression\bigskip\bigskip |
| 3 | 307 |
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
308 |
\code{rexp.findFirstIn(string)}\medskip
|
| 3 | 309 |
|
|
253
75c469893514
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parents:
252
diff
changeset
|
310 |
returns either \code{None} if no (sub)string matches
|
|
75c469893514
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Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
311 |
or \code{Some(s)} with the first (sub)string
|
| 0 | 312 |
|
|
253
75c469893514
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parents:
252
diff
changeset
|
313 |
\end{frame}
|
| 0 | 314 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
315 |
||
316 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
317 |
\begin{frame}[c]
|
|
318 |
||
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
319 |
\footnotesize |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
320 |
\lstinputlisting{../progs/app2.scala}\medskip
|
| 0 | 321 |
|
|
253
75c469893514
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Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
322 |
\code{crawl(some_start_URL, 2)}\
|
| 0 | 323 |
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
324 |
\end{frame}
|
| 0 | 325 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
326 |
||
327 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
| 3 | 328 |
\begin{frame}[c]
|
| 0 | 329 |
|
| 3 | 330 |
\footnotesize |
331 |
a version that only ``crawls'' links in my domain: |
|
| 0 | 332 |
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
333 |
\lstinputlisting{../progs/app3.scala}
|
| 0 | 334 |
|
|
253
75c469893514
added coursework
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parents:
252
diff
changeset
|
335 |
\end{frame}
|
| 0 | 336 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
337 |
||
338 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
339 |
\begin{frame}[c]
|
|
| 3 | 340 |
|
341 |
\footnotesize |
|
342 |
a little email ``harvester'': |
|
343 |
||
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
344 |
\footnotesize |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
345 |
\lstinputlisting{../progs/app4.scala}\bigskip
|
| 3 | 346 |
|
347 |
\tiny |
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
348 |
\url{http://net.tutsplus.com/tutorials/other/8-regular-expressions-you-should-know/}
|
| 3 | 349 |
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
350 |
\end{frame}
|
| 3 | 351 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
352 |
||
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
353 |
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
354 |
|
| 3 | 355 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 14 | 356 |
\begin{frame}[t]
|
| 3 | 357 |
\frametitle{\begin{tabular}{c}Regular Expressions\end{tabular}}
|
| 0 | 358 |
|
| 14 | 359 |
Their inductive definition:\medskip |
360 |
||
361 |
\begin{textblock}{6}(2,5)
|
|
| 3 | 362 |
\begin{tabular}{@ {}rrl@ {\hspace{13mm}}l}
|
363 |
\bl{r} & \bl{$::=$} & \bl{$\varnothing$} & null\\
|
|
| 5 | 364 |
& \bl{$\mid$} & \bl{$\epsilon$} & empty string / "" / []\\
|
| 3 | 365 |
& \bl{$\mid$} & \bl{c} & character\\
|
366 |
& \bl{$\mid$} & \bl{r$_1$ $\cdot$ r$_2$} & sequence\\
|
|
367 |
& \bl{$\mid$} & \bl{r$_1$ + r$_2$} & alternative / choice\\
|
|
368 |
& \bl{$\mid$} & \bl{r$^*$} & star (zero or more)\\
|
|
369 |
\end{tabular}
|
|
370 |
\end{textblock}
|
|
371 |
||
372 |
\end{frame}}
|
|
373 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
374 |
||
375 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
376 |
\begin{frame}[t]
|
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
377 |
\frametitle{Regular Expressions}
|
| 3 | 378 |
|
| 14 | 379 |
\small |
380 |
In Scala: |
|
381 |
||
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
382 |
\footnotesize |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
383 |
\lstinputlisting{../progs/app51.scala}
|
| 0 | 384 |
|
385 |
||
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
386 |
\end{frame}
|
| 0 | 387 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
388 |
||
389 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
390 |
\mode<presentation>{
|
|
391 |
\begin{frame}[c]
|
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
392 |
\frametitle{\begin{tabular}{c}The Meaning of a\\[-2mm]
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
393 |
Regular Expression\end{tabular}}
|
| 0 | 394 |
|
| 4 | 395 |
\begin{textblock}{15}(1,4)
|
| 3 | 396 |
\begin{tabular}{@ {}rcl}
|
397 |
\bl{$L$($\varnothing$)} & \bl{$\dn$} & \bl{$\varnothing$}\\
|
|
398 |
\bl{$L$($\epsilon$)} & \bl{$\dn$} & \bl{$\{$""$\}$}\\
|
|
399 |
\bl{$L$(c)} & \bl{$\dn$} & \bl{$\{$"c"$\}$}\\
|
|
400 |
\bl{$L$(r$_1$ + r$_2$)} & \bl{$\dn$} & \bl{$L$(r$_1$) $\cup$ $L$(r$_2$)}\\
|
|
| 4 | 401 |
\bl{$L$(r$_1$ $\cdot$ r$_2$)} & \bl{$\dn$} & \bl{$\{$ s$_1$ @ s$_2$ $|$ s$_1$ $\in$ $L$(r$_1$) $\wedge$ s$_2$ $\in$
|
402 |
$L$(r$_2$) $\}$}\\ |
|
| 5 | 403 |
\bl{$L$(r$^*$)} & \bl{$\dn$} & \onslide<4->{\bl{$\bigcup_{n \ge 0}$ $L$(r)$^n$}}\\
|
| 4 | 404 |
\end{tabular}\bigskip
|
| 3 | 405 |
|
| 4 | 406 |
\onslide<2->{
|
407 |
\hspace{5mm}\bl{$L$(r)$^0$ $\;\dn\;$ $\{$""$\}$}\\
|
|
| 5 | 408 |
\bl{$L$(r)$^{n+1}$ $\;\dn\;$ $L$(r) @ $L$(r)$^n$}\hspace{9mm}\onslide<3->{\small\textcolor{gray}{(append on sets)}\\
|
409 |
\small\hspace{5cm}\textcolor{gray}{$\{$ s$_1$ @ s$_2$ $|$ s$_1$ $\in$ $L$(r) $\wedge$ s$_2$ $\in$
|
|
410 |
$L$(r)$^n$ $\}$}} |
|
| 4 | 411 |
} |
412 |
\end{textblock}
|
|
413 |
||
| 0 | 414 |
\end{frame}}
|
415 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
416 |
||
| 5 | 417 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
418 |
\mode<presentation>{
|
|
419 |
\begin{frame}[c]
|
|
| 8 | 420 |
\frametitle{\begin{tabular}{c}The Meaning of Matching\end{tabular}}
|
| 5 | 421 |
|
422 |
\large |
|
423 |
a regular expression \bl{r} matches a string \bl{s} is defined as
|
|
424 |
||
425 |
\begin{center}
|
|
426 |
\bl{s $\in$ $L$(r)}\\
|
|
427 |
\end{center}
|
|
428 |
||
429 |
\end{frame}}
|
|
430 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
431 |
||
| 3 | 432 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
433 |
\mode<presentation>{
|
|
434 |
\begin{frame}[c]
|
|
435 |
\frametitle{\begin{tabular}{c}This Course\end{tabular}}
|
|
436 |
||
| 7 | 437 |
We will have a look at: |
| 3 | 438 |
|
439 |
\begin{itemize}
|
|
| 7 | 440 |
\item regular expressions / regular expression matching |
|
97
60a3ba90dd53
added
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
95
diff
changeset
|
441 |
\item derivatives |
| 3 | 442 |
\item automata |
443 |
\item parsing |
|
444 |
\item grammars |
|
|
97
60a3ba90dd53
added
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
95
diff
changeset
|
445 |
\item a small interpreter / compiler |
| 3 | 446 |
\end{itemize}
|
447 |
||
448 |
\end{frame}}
|
|
449 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
450 |
||
| 0 | 451 |
|
452 |
||
453 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
454 |
\begin{frame}[c]
|
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
455 |
\frametitle{Written Exam}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
456 |
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
457 |
\begin{itemize}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
458 |
\item Accounts for 75\%.\bigskip |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
459 |
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
460 |
\item You will understand the question ``Is this relevant for |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
461 |
the exam?'' is very demotivating for the lecturer!\bigskip\\ |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
462 |
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
463 |
\item Deal: Whatever is in the homework (and is not marked |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
464 |
``optional'') is relevant for the exam. |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
465 |
\end{itemize}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
466 |
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
467 |
\end{frame}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
468 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
469 |
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
470 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
471 |
\begin{frame}[t]
|
|
75c469893514
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Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
472 |
\frametitle{Coursework}
|
| 0 | 473 |
|
474 |
\begin{itemize}
|
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
475 |
\item Accounts for 25\%. Two strands. Choose \alert{\bf one}!\bigskip
|
| 0 | 476 |
\end{itemize}
|
477 |
||
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
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diff
changeset
|
478 |
\begin{columns}[t]
\begin{column}{.5\textwidth}
\underline{\bf Strand 1}\medskip
|
|
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Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
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diff
changeset
|
479 |
\begin{itemize}
|
|
75c469893514
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Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
480 |
\item four programming subtasks: |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
481 |
\begin{itemize}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
482 |
\item matcher (5\%, 13.10.) |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
483 |
\item lexer (5\%, 03.11.) |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
484 |
\item parser (5\%, 27.11.) |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
485 |
\item compiler (10\%, 12.12.) |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
486 |
\end{itemize}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
487 |
\end{itemize}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
488 |
\end{column}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
489 |
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
490 |
\hspace{-45pt}\vrule{}\hspace{10pt}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
491 |
\begin{column}{.5\textwidth}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
492 |
\underline{\bf Strand 2}\smallskip
\begin{itemize}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
493 |
\item one task: prove the correctness of a regular expression matcher in |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
494 |
the Isabelle theorem prover |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
495 |
\item 25\%, submission 12.12. |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
496 |
\end{itemize}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
497 |
\end{column}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
498 |
\end{columns}\medskip
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
499 |
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
500 |
\small |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
501 |
\begin{itemize}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
502 |
\item Solving more than one strand will {\bf not} give you more
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
503 |
marks.\\[-2mm] |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
504 |
\item The exam will contain in much, much smaller form |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
505 |
elements from both (but will also be in lectures and HW). |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
506 |
\end{itemize}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
507 |
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
508 |
\end{frame}
|
| 0 | 509 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
510 |
||
511 |
\end{document}
|
|
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|
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