| author | Christian Urban <urbanc@in.tum.de> |
| Tue, 25 Sep 2018 00:27:06 +0100 | |
| changeset 559 | 893e756e18f5 |
| parent 512 | 56550ad904d8 |
| child 560 | 0acbeb9a4b9f |
| 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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\lstset{language=Scala,
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style=mystyle, |
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numbersep=0pt, |
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numbers=none, |
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xleftmargin=0mm} |
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\newcommand{\bl}[1]{\textcolor{blue}{#1}}
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% beamer stuff |
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\renewcommand{\slidecaption}{CFL 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 Compilers and \\[-1mm] |
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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: & N\liningnums{7.07} (North Wing, Bush House)\\
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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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\begin{frame}[t]
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\frametitle{Why Study Compilers?}
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John Regehr {\small(LLVM compiler hacker)}\smallskip\\
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\begin{bubble}[10.5cm]
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\bf ``\ldots{}It’s effectively a perpetual
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employment act for solid compiler hackers.'' |
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\end{bubble}
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\onslide<1->{
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\only<2>{
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\begin{itemize}
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\item {\bf Hardware is getting weirder
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rather than getting clocked faster} |
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\begin{itemize}
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\item Almost all processors are |
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multicores nowadays and it looks like there is increasing asymmetry in |
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resources across cores. Processors come with vector units, crypto |
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accelerators etc. We have DSPs, GPUs, |
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ARM big.little, and Xeon Phi. This is only scratching the |
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surface. |
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\end{itemize}
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\end{itemize}}
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\only<3>{
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\begin{itemize}
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\item {\bf We’re getting tired of low-level languages and
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their associated security disasters} |
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\begin{itemize}
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\item |
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We want to write new code, to |
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whatever extent possible, in safer, higher-level |
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languages. Compilers are caught right in the middle of these |
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opposing trends: one of their main jobs is to help bridge the large |
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and growing gap between increasingly high-level languages and |
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increasingly wacky platforms. |
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\end{itemize}
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\end{itemize}}}
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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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\frametitle{Why Bother?}
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\begin{columns}[t]
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\begin{column}{.5\textwidth}
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Ruby, Python, Java 8\medskip\\ |
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\begin{tikzpicture}\footnotesize
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\begin{axis}[
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xlabel={$n$},
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x label style={at={(1.05,0.0)}},
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ylabel={time in secs},
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enlargelimits=false, |
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xtick={0,5,...,30},
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xmax=33, |
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ymax=35, |
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ytick={0,5,...,30},
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scaled ticks=false, |
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axis lines=left, |
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width=5.5cm, |
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height=4cm, |
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legend entries={Python,Ruby},
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legend pos=north west, |
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legend cell align=left] |
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\addplot[blue,mark=*, mark options={fill=white}] table {re-python.data};
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\addplot[brown,mark=triangle*, mark options={fill=white}] table {re-ruby.data};
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\end{axis}
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\end{tikzpicture}
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\begin{tikzpicture}\footnotesize
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\begin{axis}[
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xlabel={$n$},
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x label style={at={(1.05,0.0)}},
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ylabel={time in secs},
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enlargelimits=false, |
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xtick={0,5,...,30},
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xmax=33, |
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ymax=35, |
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ytick={0,5,...,30},
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scaled ticks=false, |
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axis lines=left, |
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width=5.5cm, |
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height=4cm, |
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legend entries={Python, Java 8},
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legend pos=north west, |
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legend cell align=left] |
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\addplot[blue,mark=*, mark options={fill=white}] table {re-python2.data};
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\addplot[cyan,mark=*, mark options={fill=white}] table {re-java.data};
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\end{axis}
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\end{tikzpicture}
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\end{column}
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\begin{column}{.5\textwidth}
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Us (after next lecture)\medskip\\ |
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\begin{tikzpicture}\footnotesize
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\begin{axis}[
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xlabel={$n$},
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x label style={at={(1.07,0.0)}},
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ylabel={time in secs},
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enlargelimits=false, |
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xtick={0,5000,...,10000},
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xmax=11000, |
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ymax=35, |
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ytick={0,5,...,30},
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scaled ticks=false, |
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axis lines=left, |
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width=5.5cm, |
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height=4cm] |
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\addplot[green,mark=square*,mark options={fill=white}] table {re2.data};
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\addplot[black,mark=square*,mark options={fill=white}] table {re3.data};
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\end{axis}
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\end{tikzpicture}
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parents:
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\begin{tikzpicture}\footnotesize
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parents:
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\begin{axis}[
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parents:
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xlabel={$n$},
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parents:
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x label style={at={(1.07,0.0)}},
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parents:
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ylabel={time in secs},
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parents:
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enlargelimits=false, |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
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ymax=35, |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
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173 |
ytick={0,5,...,30},
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Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
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174 |
scaled ticks=false, |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
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changeset
|
175 |
axis lines=left, |
|
a47c4227a0c6
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Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
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changeset
|
176 |
width=5.5cm, |
|
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Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
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|
177 |
height=4cm] |
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a47c4227a0c6
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
334
diff
changeset
|
178 |
\addplot[black,mark=square*,mark options={fill=white}] table {re3a.data};
|
|
a47c4227a0c6
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
334
diff
changeset
|
179 |
\end{axis}
|
|
255
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
180 |
\end{tikzpicture}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
181 |
\end{column}
|
|
428
a47c4227a0c6
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
334
diff
changeset
|
182 |
\end{columns}\bigskip
|
|
255
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
183 |
|
|
428
a47c4227a0c6
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
334
diff
changeset
|
184 |
\small\centering |
| 559 | 185 |
matching \texttt{[a?]\{n\}[a]\{n\}} and \texttt{(a*)*b}
|
|
428
a47c4227a0c6
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
334
diff
changeset
|
186 |
against $\underbrace{\texttt{a}...\texttt{a}}_n$
|
| 510 | 187 |
\end{frame}
|
|
255
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
188 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
189 |
|
|
428
a47c4227a0c6
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
334
diff
changeset
|
190 |
|
|
255
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
191 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
192 |
\begin{frame}[c]
|
| 559 | 193 |
\frametitle{The Goal of this Module}
|
194 |
||
195 |
\begin{center}
|
|
196 |
\begin{tikzpicture}[scale=1,
|
|
197 |
node/.style={
|
|
198 |
rectangle,rounded corners=3mm, |
|
199 |
very thick,draw=black!50,minimum height=18mm, minimum width=20mm, |
|
200 |
top color=white,bottom color=black!20}] |
|
201 |
||
202 |
\node at (3.05, 1.8) {\Large\bf Write a compiler};
|
|
203 |
||
204 |
\node (0) at (-2.3,0) {};
|
|
205 |
||
206 |
\node (A) at (0,0) [node] {};
|
|
207 |
\node [below right] at (A.north west) {lexer};
|
|
208 |
||
209 |
\node (B) at (3,0) [node] {};
|
|
210 |
\node [below right=1mm] at (B.north west) {\mbox{}\hspace{-1mm}parser};
|
|
211 |
||
212 |
\node (C) at (6,0) [node] {};
|
|
213 |
\node [below right] at (C.north west) {\mbox{}\hspace{-1mm}code gen};
|
|
214 |
||
215 |
\node (1) at (8.4,0) {};
|
|
216 |
||
217 |
\draw [->,line width=4mm] (0) -- (A); |
|
218 |
\draw [->,line width=4mm] (A) -- (B); |
|
219 |
\draw [->,line width=4mm] (B) -- (C); |
|
220 |
\draw [->,line width=4mm] (C) -- (1); |
|
221 |
\end{tikzpicture}
|
|
222 |
\end{center}
|
|
223 |
||
224 |
\only<2,3,4>{
|
|
225 |
\begin{textblock}{1}(1,2.1)
|
|
226 |
\begin{bubble}[9.8cm]
|
|
227 |
\normalsize |
|
228 |
lexer input: a string\smallskip\\ |
|
229 |
\hspace{5mm}\code{"read(n);"}\medskip\\
|
|
230 |
lexer output: a sequence of tokens\smallskip\\ |
|
231 |
\hspace{5mm}\code{key(read) lpar id(n) rpar semi}
|
|
232 |
\end{bubble}
|
|
233 |
\end{textblock}}
|
|
234 |
||
235 |
\only<3,4>{
|
|
236 |
\begin{textblock}{1}(6,7.8)
|
|
237 |
\begin{tabular}{c}
|
|
238 |
\includegraphics[scale=0.2]{../pics/rosetta.jpg}\\[-2mm]
|
|
239 |
\footnotesize lexing $\Rightarrow$ recognising words (Stone of Rosetta) |
|
240 |
\end{tabular}
|
|
241 |
\end{textblock}}
|
|
242 |
||
243 |
\only<4>{
|
|
244 |
\begin{textblock}{1}(0.5,12)\small
|
|
245 |
\begin{tabular}{l@{}c@{}l}
|
|
246 |
\pcode{if} & $\;\Rightarrow\;$ & keyword\\
|
|
247 |
\pcode{iffoo} & $\;\Rightarrow\;$ & identifier\\
|
|
248 |
\end{tabular}
|
|
249 |
\end{textblock}}
|
|
250 |
||
251 |
\only<5>{
|
|
252 |
\begin{textblock}{1}(1,1.5)
|
|
253 |
\begin{bubble}[8.5cm]
|
|
254 |
\normalsize |
|
255 |
parser input: a sequence of tokens\smallskip\\ |
|
256 |
||
257 |
{\small\hspace{5mm}\code{key(read) lpar id(n) rpar semi}}\smallskip\\
|
|
258 |
||
259 |
parser output: an abstract syntax tree\smallskip\\ |
|
260 |
\footnotesize |
|
261 |
\hspace{2cm}\begin{tikzpicture}
|
|
262 |
\node {\code{read}}
|
|
263 |
child {node {\code{lpar}}}
|
|
264 |
child {node {\code{n}}}
|
|
265 |
child {node {\code{rpar}}};
|
|
266 |
\end{tikzpicture}
|
|
267 |
\end{bubble}
|
|
268 |
\end{textblock}}
|
|
269 |
||
270 |
\only<6,7>{
|
|
271 |
\begin{textblock}{1}(1,1.5)
|
|
272 |
\begin{bubble}[4cm]
|
|
273 |
\normalsize |
|
274 |
code generator:\smallskip\\ |
|
275 |
\hspace{5mm}\code{istore 2}\\
|
|
276 |
\hspace{5mm}\code{iload 2}\\
|
|
277 |
\hspace{5mm}\code{ldc 10}\\
|
|
278 |
\hspace{5mm}\code{isub}\\
|
|
279 |
\hspace{5mm}\code{ifeq Label2}\\
|
|
280 |
\hspace{5mm}\code{iload 2}\\
|
|
281 |
\hspace{5mm}\code{...}\\
|
|
282 |
\end{bubble}
|
|
283 |
\end{textblock}}
|
|
284 |
||
285 |
\only<7>{
|
|
286 |
\begin{textblock}{6}(8.4,7)
|
|
287 |
\begin{bubble}[5cm]
|
|
288 |
\mbox{\begin{tikzpicture}[scale=0.58,rounded corners=0mm]
|
|
289 |
\begin{axis}[axis x line=bottom, axis y line=left, ylabel=secs,
|
|
290 |
xlabel=n, |
|
291 |
enlargelimits=0.05, |
|
292 |
ybar interval=0.7, legend style=small] |
|
293 |
\addplot file {interpreted2.data};
|
|
294 |
\addplot file {compiled2.data};
|
|
295 |
%\legend{interpreted, compiled}
|
|
296 |
\end{axis}
|
|
297 |
\end{tikzpicture}}
|
|
298 |
\end{bubble}
|
|
299 |
\end{textblock}}
|
|
300 |
||
301 |
\end{frame}
|
|
302 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
303 |
||
304 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
305 |
\begin{frame}[c]
|
|
306 |
\frametitle{The Acad.~Subject is Mature}
|
|
307 |
||
308 |
\begin{itemize}
|
|
309 |
\item Turing Machines, 1936 |
|
310 |
\item Regular Expressions, 1956\\ |
|
311 |
\item The first compiler for COBOL, 1957\\ (Grace Hopper) |
|
312 |
\item But surprisingly research papers are still published nowadays\\ |
|
313 |
\item ``Parsing: The Solved Problem That Isn't'' |
|
314 |
\end{itemize}
|
|
315 |
||
316 |
\begin{flushright}
|
|
317 |
\includegraphics[scale=0.3]{pics/hopper.jpg}\\
|
|
318 |
\footnotesize\textcolor{gray}{Grace Hopper}
|
|
319 |
\end{flushright}
|
|
320 |
||
321 |
||
322 |
\begin{flushright}
|
|
323 |
\mbox{}\\[-6mm]
|
|
324 |
{\footnotesize\textcolor{gray}{(she made it to David Letterman's Tonight Show,\\[-2mm]
|
|
325 |
\url{http://www.youtube.com/watch?v=aZOxtURhfEU})}}
|
|
326 |
\end{flushright}
|
|
327 |
||
328 |
\end{frame}
|
|
329 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
330 |
||
331 |
||
332 |
||
333 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
334 |
\begin{frame}[c]
|
|
|
327
9470cd124667
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
255
diff
changeset
|
335 |
\frametitle{Lectures 1 - 5}
|
|
255
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
336 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
337 |
transforming strings into structured data\\[10mm] |
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
338 |
|
| 506 | 339 |
{\LARGE\bf Lexing} {\hfill{}based on regular expressions}\medskip\\
|
|
255
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
340 |
\hspace{5mm}(recognising ``words'')\\[6mm]
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
341 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
342 |
{\LARGE\bf Parsing}\medskip\\
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
343 |
\hspace{5mm}(recognising ``sentences'')
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
344 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
345 |
\begin{textblock}{1}(10,9.1)
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
346 |
\begin{tabular}{c}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
347 |
\includegraphics[scale=0.1]{../pics/rosetta.jpg}\\[-2mm]
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
348 |
\footnotesize Stone of Rosetta |
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
349 |
\end{tabular}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
350 |
\end{textblock}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
351 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
352 |
\end{frame}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
353 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
354 |
|
| 1 | 355 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
255
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
356 |
\begin{frame}[t]
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
357 |
\frametitle{Familiar Regular Expr.}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
358 |
\small |
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
359 |
\begin{center}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
360 |
\texttt{[a-z0-9\_.-]+ @ [a-z0-9.-]+ . [a-z.]\{2,6\}}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
361 |
\end{center}\smallskip
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
362 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
363 |
\begin{center}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
364 |
\begin{tabular}{@{}lp{8.5cm}@{}}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
365 |
\pcode{re*} & matches 0 or more times\\
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
366 |
\pcode{re+} & matches 1 or more times\\
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
367 |
\pcode{re?} & matches 0 or 1 times\\
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
368 |
\pcode{re\{n\}} & matches exactly \pcode{n} number of times\\
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
369 |
\pcode{re\{n,m\}} & matches at least \pcode{n} and at most {\tt m} times\\
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
370 |
\pcode{[...]} & matches any single character inside the brackets\\
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
371 |
\pcode{[^...]} & matches any single character not inside the
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
372 |
brackets\\ |
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
373 |
\pcode{a-zA-Z} & character ranges\\
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
374 |
\pcode{\\d} & matches digits; equivalent to \pcode{[0-9]}\\
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
375 |
\pcode{.} & matches every character except newline\\
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
376 |
\pcode{(re)} & groups regular expressions and remembers
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
377 |
the matched text |
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
378 |
\end{tabular}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
379 |
\end{center}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
380 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
381 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
382 |
\end{frame}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
383 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
384 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
385 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 1 | 386 |
\begin{frame}[c]
|
|
255
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
387 |
\frametitle{Today}
|
| 0 | 388 |
|
| 1 | 389 |
\begin{itemize}
|
|
332
4755ad4b457b
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
331
diff
changeset
|
390 |
\item While the ultimate goal is to implement a small compiler |
|
4755ad4b457b
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
331
diff
changeset
|
391 |
(a really small one for the JVM)\ldots\bigskip |
| 1 | 392 |
\end{itemize}
|
393 |
||
394 |
Let's start with: |
|
395 |
||
396 |
\begin{itemize}
|
|
397 |
\item a web-crawler |
|
398 |
\item an email harvester |
|
| 559 | 399 |
%\item \textcolor{gray}{(a web-scraper)}
|
| 1 | 400 |
\end{itemize}
|
401 |
||
|
255
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
402 |
\end{frame}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
403 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 0 | 404 |
|
| 2 | 405 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 3 | 406 |
\begin{frame}[t]
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
407 |
\frametitle{A Web-Crawler}
|
| 2 | 408 |
|
| 3 | 409 |
\mbox{}\\[10mm]
|
410 |
||
| 2 | 411 |
\begin{enumerate}
|
412 |
\item given an URL, read the corresponding webpage |
|
413 |
\item extract all links from it |
|
414 |
\item call the web-crawler again for all these links |
|
415 |
\end{enumerate}
|
|
416 |
||
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
417 |
\end{frame}
|
| 2 | 418 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
419 |
||
420 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
| 3 | 421 |
\begin{frame}[t]
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
422 |
\frametitle{A Web-Crawler}
|
| 2 | 423 |
|
| 3 | 424 |
\mbox{}\\[10mm]
|
425 |
||
426 |
||
| 2 | 427 |
\begin{enumerate}
|
428 |
\item given an URL, read the corresponding webpage |
|
429 |
\item if not possible print, out a problem |
|
430 |
\item if possible, extract all links from it |
|
431 |
\item call the web-crawler again for all these links |
|
432 |
\end{enumerate}\bigskip\pause
|
|
433 |
||
| 3 | 434 |
\small (we need a bound for the number of recursive calls) |
| 2 | 435 |
|
436 |
\small (the purpose is to check all links on my own webpage) |
|
| 559 | 437 |
\end{frame}
|
| 2 | 438 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
439 |
||
|
255
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
440 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
441 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
442 |
\begin{frame}[c]
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
443 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
444 |
\begin{textblock}{1}(2,5)
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
445 |
\begin{tabular}{c}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
446 |
\includegraphics[scale=0.15]{pics/servers.png}\\[-2mm]
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
447 |
\small Server |
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
448 |
\end{tabular}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
449 |
\end{textblock}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
450 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
451 |
\begin{textblock}{1}(5.6,4)
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
452 |
\begin{tikzpicture}[scale=1.1]
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
453 |
\draw[white] (0,1) node (X) {};
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
454 |
\draw[white] (2,1) node (Y) {};
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
455 |
\draw[white] (0,0) node (X1) {};
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
456 |
\draw[white] (2,0) node (Y1) {};
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
457 |
\draw[white] (0,-1) node (X2) {};
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
458 |
\draw[white] (2,-1) node (Y2) {};
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
459 |
\draw[red, <-, line width = 2mm] (X) -- (Y); |
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
460 |
\node [inner sep=5pt,label=above:\textcolor{black}{GET request}] at ($ (X)!.5!(Y) $) {};
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
461 |
\draw[red, ->, line width = 2mm] (X1) -- (Y1); |
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
462 |
\node [inner sep=5pt,label=above:\textcolor{black}{webpage}] at ($ (X1)!.5!(Y1) $) {};
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
463 |
\draw[red, <-, line width = 2mm] (X2) -- (Y2); |
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
464 |
\node [inner sep=7pt,label=above:\textcolor{black}{POST data}] at ($ (X2)!.5!(Y2) $) {};
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
465 |
\end{tikzpicture}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
466 |
\end{textblock}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
467 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
468 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
469 |
\begin{textblock}{1}(9,5.5)
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
470 |
\begin{tabular}{c}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
471 |
\includegraphics[scale=0.15]{pics/laptop.png}\\[-2mm]
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
472 |
\small Browser |
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
473 |
\end{tabular}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
474 |
\end{textblock}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
475 |
\end{frame}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
476 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
477 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
478 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
479 |
|
| 0 | 480 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
481 |
\begin{frame}[c]
|
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
482 |
\frametitle{Scala}
|
| 1 | 483 |
|
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
484 |
\small A simple Scala function for reading webpages: |
| 559 | 485 |
\bigskip |
| 0 | 486 |
|
|
98
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
487 |
\footnotesize |
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
488 |
\lstinputlisting{../progs/app0.scala}
|
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
489 |
\medskip\pause |
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
490 |
|
| 559 | 491 |
\lstinline{get_page("""https://nms.kcl.ac.uk/christian.urban/""")}
|
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
492 |
\bigskip\medskip\pause |
| 0 | 493 |
|
| 3 | 494 |
|
|
428
a47c4227a0c6
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
334
diff
changeset
|
495 |
\small A slightly more complicated version for handling errors: |
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
496 |
\smallskip |
| 2 | 497 |
|
|
98
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
498 |
\footnotesize |
| 559 | 499 |
\lstinputlisting[xleftmargin=-4mm]{../progs/app1.scala}
|
| 1 | 500 |
|
| 0 | 501 |
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
502 |
\end{frame}
|
| 0 | 503 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
504 |
||
|
98
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
505 |
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
506 |
|
|
1f3d89fe9820
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
97
diff
changeset
|
507 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 3 | 508 |
\begin{frame}[t]
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
509 |
\frametitle{A Regular Expression}
|
| 3 | 510 |
|
511 |
\begin{itemize}
|
|
512 |
\item \ldots{} is a pattern or template for specifying strings
|
|
513 |
\end{itemize}\bigskip
|
|
514 |
||
515 |
\begin{center}
|
|
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
516 |
\only<1>{\scode{"https?://[^"]*"}}%
|
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
517 |
\only<2>{\scode{""""https?://[^"]*"""".r}}
|
| 3 | 518 |
\end{center}\bigskip\bigskip
|
519 |
||
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
520 |
matches for example\smallskip\\ |
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
521 |
\hspace{2mm}\code{"http://www.foobar.com"}\\
|
| 559 | 522 |
\hspace{2mm}\code{"https://www.tls.org"}\smallskip\\
|
523 |
||
524 |
but not\smallskip\\ |
|
525 |
\hspace{2mm}\code{"http://www."foo"bar.com"}\\
|
|
| 3 | 526 |
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
527 |
\end{frame}
|
| 3 | 528 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
529 |
||
530 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
| 559 | 531 |
\begin{frame}[c]
|
532 |
\frametitle{Finding Operations in Scala}
|
|
| 0 | 533 |
|
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
534 |
{\bf\code{rexp.findAllIn(string)}}\medskip
|
| 3 | 535 |
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
536 |
returns a list of all (sub)strings that match the |
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
537 |
regular expression |
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
538 |
\bigskip\bigskip |
| 0 | 539 |
|
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
540 |
|
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
541 |
{\bf\code{rexp.findFirstIn(string)}}\medskip
|
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
542 |
|
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
543 |
returns either |
| 0 | 544 |
|
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
545 |
\begin{itemize}
|
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
546 |
\item \code{None} if no (sub)string matches or
|
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
547 |
\item \code{Some(s)} with the first (sub)string
|
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
548 |
\end{itemize}
|
| 0 | 549 |
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
550 |
\end{frame}
|
| 0 | 551 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
552 |
||
553 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
| 3 | 554 |
\begin{frame}[c]
|
| 0 | 555 |
|
| 3 | 556 |
\footnotesize |
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
557 |
\lstinputlisting{../progs/app2.scala}
|
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
558 |
|
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
559 |
\end{frame}
|
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
560 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 0 | 561 |
|
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
562 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
563 |
\begin{frame}[c]
|
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
564 |
|
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
565 |
\small |
| 559 | 566 |
A version that only crawls links in ``my'' domain:\bigskip |
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
567 |
|
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
568 |
\footnotesize |
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
569 |
\lstinputlisting{../progs/app3.scala}
|
| 0 | 570 |
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
571 |
\end{frame}
|
| 0 | 572 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
573 |
||
574 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
575 |
\begin{frame}[c]
|
|
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
576 |
\lstset{xleftmargin=-4mm}
|
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
577 |
\small |
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
578 |
A little email harvester: |
| 3 | 579 |
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
580 |
\footnotesize |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
581 |
\lstinputlisting{../progs/app4.scala}\bigskip
|
| 3 | 582 |
|
583 |
\tiny |
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
584 |
\url{http://net.tutsplus.com/tutorials/other/8-regular-expressions-you-should-know/}
|
| 3 | 585 |
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
586 |
\end{frame}
|
| 3 | 587 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
588 |
||
589 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
| 14 | 590 |
\begin{frame}[t]
|
| 506 | 591 |
\frametitle{Regular Expressions}
|
| 0 | 592 |
|
|
330
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
593 |
Their inductive definition: |
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
594 |
|
| 14 | 595 |
|
|
330
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
596 |
\begin{textblock}{6}(2,7.5)
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
597 |
\begin{tabular}{@ {}rrl@ {\hspace{13mm}}l}
|
| 512 | 598 |
\bl{$r$} & \bl{$::=$} & \bl{$\ZERO$} & nothing\\
|
|
428
a47c4227a0c6
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
334
diff
changeset
|
599 |
& \bl{$\mid$} & \bl{$\ONE$} & empty string / \pcode{""} / $[]$\\
|
|
330
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
600 |
& \bl{$\mid$} & \bl{$c$} & character\\
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
601 |
& \bl{$\mid$} & \bl{$r_1 + r_2$} & alternative / choice\\
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
602 |
& \bl{$\mid$} & \bl{$r_1 \cdot r_2$} & sequence\\
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
603 |
& \bl{$\mid$} & \bl{$r^*$} & star (zero or more)\\
|
| 3 | 604 |
\end{tabular}
|
605 |
\end{textblock}
|
|
606 |
||
|
330
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
607 |
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
608 |
\only<2->{\footnotesize
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
609 |
\begin{textblock}{9}(2,0.5)
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
610 |
\begin{bubble}[9.8cm]
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
611 |
\lstinputlisting{../progs/app01.scala}
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
612 |
\end{bubble}
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
613 |
\end{textblock}}
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
614 |
|
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
615 |
\end{frame}
|
| 3 | 616 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
617 |
||
618 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
| 506 | 619 |
%\begin{frame}[t]
|
620 |
%\frametitle{Regular Expressions}
|
|
621 |
% |
|
622 |
%\small |
|
623 |
%In Scala:\bigskip |
|
624 |
% |
|
625 |
%\footnotesize |
|
626 |
%\lstinputlisting{../progs/app51.scala}
|
|
627 |
% |
|
628 |
% |
|
629 |
%\end{frame}
|
|
| 0 | 630 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
631 |
||
632 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
|
255
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
633 |
\begin{frame}[t]
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
634 |
\frametitle{Strings}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
635 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
636 |
\ldots are lists of characters. For example \code{"hello"}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
637 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
638 |
\begin{center}
|
|
330
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
639 |
\bl{$[h, e, l, l, o]$} or just \bl{$hello$}
|
|
255
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
640 |
\end{center}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
641 |
|
|
330
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
642 |
the empty string: \bl{$[]$} or \bl{\pcode{""}}\bigskip\\
|
|
255
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
643 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
644 |
the concatenation of two strings: |
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
645 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
646 |
\begin{center}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
647 |
\bl{$s_1 \,@\, s_2$}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
648 |
\end{center}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
649 |
|
|
330
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
650 |
\bl{\textit{foo $@$ bar = foobar}, \textit{baz $@\, []$ = baz}}
|
|
255
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
651 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
652 |
\end{frame}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
653 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
654 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
655 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
330
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
656 |
\begin{frame}[c]
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
657 |
\frametitle{Languages, Strings}
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
658 |
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
659 |
\begin{itemize}
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
660 |
\item \alert{\bf Strings} are lists of characters, for example
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
661 |
\begin{center}
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
662 |
\bl{$[]$},\;\bl{$abc$} \hspace{2cm}(Pattern match: \bl{$c\!::\!s$})
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
663 |
\end{center}\bigskip
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
664 |
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
665 |
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
666 |
\item A \alert{\bf language} is a set of strings, for example\medskip
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
667 |
\begin{center}
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
668 |
\bl{$\{[], hello, \textit{foobar}, a, abc\}$}
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
669 |
\end{center}\bigskip
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
670 |
|
|
332
4755ad4b457b
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
331
diff
changeset
|
671 |
\item \alert{\bf Concatenation} of strings and languages
|
|
330
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
672 |
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
673 |
\begin{center}
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
674 |
\begin{tabular}{rcl}
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
675 |
\bl{$\textit{foo}\;@\;bar$} & \bl{$=$} & \bl{$\textit{foobar}$}\medskip\\
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
676 |
\bl{$A\;@\;B$} & \bl{$\dn$} & \bl{$\{ s_1\,@\,s_2 \;\mid\; s_1 \in A \wedge s_2 \in B\}$}
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
677 |
\end{tabular}
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
678 |
\end{center}
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
679 |
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
680 |
%\item The \alert{\bf meaning} of a regular expression is a set of
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
681 |
% strings, or language. |
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
682 |
\end{itemize}
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
683 |
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
684 |
\end{frame}
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
685 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
686 |
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
687 |
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
688 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 0 | 689 |
\mode<presentation>{
|
690 |
\begin{frame}[c]
|
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
691 |
\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
|
692 |
Regular Expression\end{tabular}}
|
| 0 | 693 |
|
| 4 | 694 |
\begin{textblock}{15}(1,4)
|
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
695 |
\begin{tabular}{rcl}
|
|
428
a47c4227a0c6
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
334
diff
changeset
|
696 |
\bl{$L(\ZERO)$} & \bl{$\dn$} & \bl{$\{\}$}\\
|
|
a47c4227a0c6
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
334
diff
changeset
|
697 |
\bl{$L(\ONE)$} & \bl{$\dn$} & \bl{$\{[]\}$}\\
|
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
698 |
\bl{$L(c)$} & \bl{$\dn$} & \bl{$\{[c]\}$}\\
|
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
699 |
\bl{$L(r_1 + r_2)$} & \bl{$\dn$} & \bl{$L(r_1) \cup L(r_2)$}\\
|
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
700 |
\bl{$L(r_1 \cdot r_2)$} & \bl{$\dn$} & \bl{$\{ s_1 \,@\, s_2 \;|\; s_1 \in L(r_1) \wedge s_2 \in L(r_2) \}$}\\
|
|
428
a47c4227a0c6
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
334
diff
changeset
|
701 |
\bl{$L(r^*)$} & \bl{$\dn$} & \onslide<4->{\bl{$\bigcup_{0 \le n} L(r)^n$}}\\
|
| 4 | 702 |
\end{tabular}\bigskip
|
| 3 | 703 |
|
| 4 | 704 |
\onslide<2->{
|
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
705 |
\hspace{5mm}\bl{$L(r)^0 \;\dn\; \{[]\}$}\\
|
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
706 |
\bl{$L(r)^{n+1} \;\dn\; L(r) \,@\, L(r)^n$}\hspace{9mm}\onslide<3->{\small\textcolor{gray}{(append on sets)}\\
|
|
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
707 |
\small\hspace{5cm}\textcolor{gray}{$\{ s_1 @ s_2 \;|\; s_1\in L(r) \wedge s_2 \in L(r)^n \}$}}
|
| 4 | 708 |
} |
709 |
\end{textblock}
|
|
710 |
||
| 0 | 711 |
\end{frame}}
|
712 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
713 |
||
| 5 | 714 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
715 |
\begin{frame}[c]
|
|
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
716 |
\frametitle{The Meaning of Matching}
|
| 5 | 717 |
|
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
718 |
\begin{bubble}[10cm]
|
| 559 | 719 |
\large\bf |
| 507 | 720 |
A regular expression \bl{$r$} matches a string~\bl{$s$}
|
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
721 |
provided |
| 5 | 722 |
|
723 |
\begin{center}
|
|
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
724 |
\bl{$s \in L(r)$}\\
|
| 5 | 725 |
\end{center}
|
|
330
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
726 |
\end{bubble}\bigskip\bigskip
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
727 |
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
728 |
\ldots and the point of the next lecture is |
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
729 |
to decide this problem as fast as possible (unlike Python, |
|
428
a47c4227a0c6
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
334
diff
changeset
|
730 |
Ruby, Java) |
| 5 | 731 |
|
|
254
dcd4688690ce
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
253
diff
changeset
|
732 |
\end{frame}
|
| 5 | 733 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
734 |
||
| 0 | 735 |
|
736 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
737 |
\begin{frame}[c]
|
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
738 |
\frametitle{Written Exam}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
739 |
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
740 |
\begin{itemize}
|
|
428
a47c4227a0c6
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
334
diff
changeset
|
741 |
\item Accounts for 80\%.\bigskip |
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
742 |
|
| 559 | 743 |
\item The question ``\textit{Is this relevant for
|
|
330
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
744 |
the exam?}'' is very demotivating for the lecturer!\bigskip\\ |
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
745 |
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
746 |
\item Deal: Whatever is in the homework (and is not marked |
|
330
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
747 |
``\textit{optional}'') is relevant for the exam.\bigskip
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
748 |
|
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
749 |
\item Each lecture has also a handout. There are also handouts about |
|
0806e45d873c
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
328
diff
changeset
|
750 |
notation and Scala. |
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
751 |
\end{itemize}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
752 |
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
753 |
\end{frame}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
754 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
755 |
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
756 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
757 |
\begin{frame}[t]
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
758 |
\frametitle{Coursework}
|
| 0 | 759 |
|
760 |
\begin{itemize}
|
|
|
428
a47c4227a0c6
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
334
diff
changeset
|
761 |
\item Accounts for 20\%. Two strands. Choose \alert{\bf one}!\bigskip
|
| 0 | 762 |
\end{itemize}
|
763 |
||
|
255
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
764 |
\begin{columns}[t]
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
765 |
\begin{column}{.5\textwidth}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
766 |
\underline{\bf Strand 1}\medskip
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
767 |
\begin{itemize}
|
|
428
a47c4227a0c6
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
334
diff
changeset
|
768 |
\item four programming tasks: |
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
769 |
\begin{itemize}
|
| 559 | 770 |
\item matcher (4\%, 12.10.) |
771 |
\item lexer (5\%, 02.11.) |
|
| 506 | 772 |
\item parser (5\%, 23.11.) |
| 559 | 773 |
\item compiler (6\%, 14.12.) |
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
774 |
\end{itemize}
|
| 559 | 775 |
\item in any lang.~you like,\\ but I want to see the code |
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
776 |
\end{itemize}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
777 |
\end{column}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
778 |
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
779 |
\hspace{-45pt}\vrule{}\hspace{10pt}
|
|
255
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
780 |
\begin{column}{.5\textwidth}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
781 |
\underline{\bf Strand 2}\smallskip\begin{itemize}
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
782 |
\item one task: prove the correctness of a regular expression matcher in |
| 559 | 783 |
the \underline{Isabelle} theorem prover
|
784 |
\item 20\%, submission on~14.12.\hspace{-5mm}\mbox{}
|
|
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
785 |
\end{itemize}
|
|
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added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
786 |
\end{column}
|
|
75c469893514
added coursework
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parents:
252
diff
changeset
|
787 |
\end{columns}\medskip
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
788 |
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
789 |
\small |
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
790 |
\begin{itemize}
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
791 |
\item Solving more than one strand will {\bf not} give you more
|
| 506 | 792 |
marks. |
793 |
||
|
253
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
794 |
\end{itemize}
|
|
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added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
795 |
|
|
75c469893514
added coursework
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
252
diff
changeset
|
796 |
\end{frame}
|
| 0 | 797 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
798 |
||
|
255
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
799 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
800 |
\begin{frame}[c]
|
| 506 | 801 |
\frametitle{Lecture Capture}
|
802 |
||
803 |
\begin{itemize}
|
|
| 559 | 804 |
\item Hope it works\ldots\pause actually no, it does not!\medskip\pause |
805 |
\item It is important to use lecture capture wisely\\ (it is only the ``baseline''): |
|
| 506 | 806 |
\begin{itemize}
|
807 |
\item Lecture recordings are a study and revision aid. |
|
808 |
\item Statistically, there is a clear and direct link between attendance and |
|
809 |
attainment: Students who do not attend lectures, do less well in exams. |
|
810 |
\end{itemize}
|
|
811 |
||
812 |
\item Attending a lecture is more than watching it online -- if you do not |
|
813 |
attend, you miss out! |
|
814 |
||
815 |
\end{itemize}
|
|
816 |
||
817 |
\end{frame}
|
|
818 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
819 |
||
820 |
||
821 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
822 |
\begin{frame}[c]
|
|
|
255
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
823 |
\frametitle{\begin{tabular}{c}\\[3cm]\alert{Questions?}\end{tabular}}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
824 |
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
825 |
\mbox{}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
826 |
\end{frame}
|
|
96a99237fa42
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
254
diff
changeset
|
827 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 0 | 828 |
\end{document}
|
829 |
||
830 |
%%% Local Variables: |
|
831 |
%%% mode: latex |
|
832 |
%%% TeX-master: t |
|
833 |
%%% End: |
|
834 |