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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\documentclass[dvipsnames,14pt,t,xelatex]{beamer}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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\usepackage{../slides}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
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\usepackage{../graphics}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
4 |
\usepackage{../langs}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
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\usepackage{../data}
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0
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
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\hfuzz=220pt
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
8 |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
9 |
%\setmonofont[Scale=.88]{Consolas}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
10 |
%\newfontfamily{\consolas}{Consolas}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
11 |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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changeset
|
12 |
\lstset{language=Scala,
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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changeset
|
13 |
style=mystyle,
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
14 |
numbersep=0pt,
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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changeset
|
15 |
numbers=none,
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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changeset
|
16 |
xleftmargin=0mm}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
17 |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
18 |
\newcommand{\bl}[1]{\textcolor{blue}{#1}}
|
95
Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
19 |
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0
|
20 |
% beamer stuff
|
428
Christian Urban <christian dot urban at kcl dot ac dot uk>
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changeset
|
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\renewcommand{\slidecaption}{CFL 01, King's College London}
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0
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24 |
\begin{document}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
27 |
\begin{frame}[t]
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0
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\frametitle{%
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\begin{tabular}{@ {}c@ {}}
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1
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\\[-3mm]
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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changeset
|
31 |
\LARGE Compilers and \\[-1mm]
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1
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\LARGE Formal Languages (1)\\[-3mm]
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0
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33 |
\end{tabular}}
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\begin{center}
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1
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\includegraphics[scale=0.3]{pics/ante1.jpg}\hspace{5mm}
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37 |
\includegraphics[scale=0.31]{pics/ante2.jpg}\\
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38 |
\footnotesize\textcolor{gray}{Antikythera automaton, 100 BC (Archimedes?)}
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0
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39 |
\end{center}
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40 |
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|
41 |
\normalsize
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|
42 |
\begin{center}
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|
|
43 |
\begin{tabular}{ll}
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|
44 |
Email: & christian.urban at kcl.ac.uk\\
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500
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45 |
Office: & N7.07 (North Wing, Bush House)\\
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0
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46 |
Slides: & KEATS
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47 |
\end{tabular}
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\end{center}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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|
51 |
\end{frame}
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Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
52 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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0
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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55 |
\begin{frame}[c]
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255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
56 |
\frametitle{The Goal of this Course}
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0
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57 |
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255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
58 |
\begin{center}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
59 |
\begin{tikzpicture}[scale=1,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
60 |
node/.style={
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
61 |
rectangle,rounded corners=3mm,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
62 |
very thick,draw=black!50,minimum height=18mm, minimum width=20mm,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
63 |
top color=white,bottom color=black!20}]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
64 |
|
334
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
65 |
\node at (3.05, 1.8) {\Large\bf Write A Compiler};
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
66 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
67 |
\node (0) at (-2.3,0) {};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
68 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
69 |
\node (A) at (0,0) [node] {};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
70 |
\node [below right] at (A.north west) {lexer};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
71 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
72 |
\node (B) at (3,0) [node] {};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
73 |
\node [below right=1mm] at (B.north west) {\mbox{}\hspace{-1mm}parser};
|
|
0
|
74 |
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
75 |
\node (C) at (6,0) [node] {};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
76 |
\node [below right] at (C.north west) {\mbox{}\hspace{-1mm}code gen};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
77 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
78 |
\node (1) at (8.4,0) {};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
79 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
80 |
\draw [->,line width=4mm] (0) -- (A);
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
81 |
\draw [->,line width=4mm] (A) -- (B);
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
82 |
\draw [->,line width=4mm] (B) -- (C);
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
83 |
\draw [->,line width=4mm] (C) -- (1);
|
|
0
|
84 |
\end{tikzpicture}
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
85 |
\end{center}
|
|
0
|
86 |
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
87 |
\only<2,3>{
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
88 |
\begin{textblock}{1}(1,2)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
89 |
\begin{bubble}[9.8cm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
90 |
\normalsize
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
91 |
lexer input: a string\smallskip\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
92 |
\hspace{5mm}\code{"read(n);"}\medskip\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
93 |
lexer output: a sequence of tokens\smallskip\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
94 |
\hspace{5mm}\code{key(read); lpar; id(n); rpar; semi}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
95 |
\end{bubble}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
96 |
\end{textblock}}
|
|
0
|
97 |
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
98 |
\only<3>{
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
99 |
\begin{textblock}{1}(6,7.8)
|
|
0
|
100 |
\begin{tabular}{c}
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
101 |
\includegraphics[scale=0.2]{../pics/rosetta.jpg}\\[-2mm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
102 |
\footnotesize lexing $\Rightarrow$ recognising words (Stone of Rosetta)
|
|
0
|
103 |
\end{tabular}
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
104 |
\end{textblock}}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
105 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
106 |
\only<4>{
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
107 |
\begin{textblock}{1}(1,1.5)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
108 |
\begin{bubble}[8.5cm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
109 |
\normalsize
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
110 |
parser input: a sequence of token\smallskip\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
111 |
parser output: an abstract syntax tree\smallskip\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
112 |
\footnotesize
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
113 |
\hspace{2cm}\begin{tikzpicture}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
114 |
\node {\code{read}}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
115 |
child {node {\code{lpar}}}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
116 |
child {node {\code{n}}}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
117 |
child {node {\code{rpar}}};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
118 |
\end{tikzpicture}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
119 |
\end{bubble}
|
|
1
|
120 |
\end{textblock}}
|
|
0
|
121 |
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
122 |
\only<5,6>{
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
123 |
\begin{textblock}{1}(1,1.5)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
124 |
\begin{bubble}[4cm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
125 |
\normalsize
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
126 |
code generator:\smallskip\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
127 |
\hspace{5mm}\code{istore 2}\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
128 |
\hspace{5mm}\code{iload 2}\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
129 |
\hspace{5mm}\code{ldc 10}\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
130 |
\hspace{5mm}\code{isub}\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
131 |
\hspace{5mm}\code{ifeq Label2}\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
132 |
\hspace{5mm}\code{iload 2}\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
133 |
\hspace{5mm}\code{...}\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
134 |
\end{bubble}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
135 |
\end{textblock}}
|
|
1
|
136 |
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
137 |
\only<6>{
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
138 |
\begin{textblock}{6}(8.4,7)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
139 |
\begin{bubble}[5cm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
140 |
\mbox{\begin{tikzpicture}[scale=0.58,rounded corners=0mm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
141 |
\begin{axis}[axis x line=bottom, axis y line=left, ylabel=secs,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
142 |
xlabel=n,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
143 |
enlargelimits=0.05,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
144 |
ybar interval=0.7, legend style=small]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
145 |
\addplot file {interpreted2.data};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
146 |
\addplot file {compiled2.data};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
147 |
%\legend{interpreted, compiled}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
148 |
\end{axis}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
149 |
\end{tikzpicture}}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
150 |
\end{bubble}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
151 |
\end{textblock}}
|
|
1
|
152 |
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
153 |
\end{frame}
|
|
1
|
154 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
155 |
|
|
0
|
156 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
157 |
\begin{frame}[c]
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
158 |
\frametitle{The subject is quite old}
|
|
0
|
159 |
|
|
|
160 |
\begin{itemize}
|
|
1
|
161 |
\item Turing Machines, 1936
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
162 |
\item Regular Expressions, 1956\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
163 |
\item The first compiler for COBOL, 1957\\ (Grace Hopper)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
164 |
\item But surprisingly research papers are still published nowadays
|
|
0
|
165 |
\end{itemize}
|
|
|
166 |
|
|
1
|
167 |
\begin{flushright}
|
|
|
168 |
\includegraphics[scale=0.3]{pics/hopper.jpg}\\
|
|
|
169 |
\footnotesize\textcolor{gray}{Grace Hopper}
|
|
|
170 |
\end{flushright}
|
|
|
171 |
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
172 |
\mbox{}\\[-10mm]
|
|
1
|
173 |
{\footnotesize\textcolor{gray}{(she made it to David Letterman's Tonight Show, \url{http://www.youtube.com/watch?v=aZOxtURhfEU})}}
|
|
0
|
174 |
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
175 |
\end{frame}
|
|
1
|
176 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
177 |
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
178 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
179 |
\begin{frame}[c]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
180 |
\frametitle{Why Bother?}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
181 |
|
428
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
182 |
\begin{columns}[t]
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
183 |
\begin{column}{.5\textwidth}
|
428
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
184 |
Ruby, Python, Java\medskip\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
185 |
\begin{tikzpicture}\footnotesize
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
186 |
\begin{axis}[
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
187 |
xlabel={$n$},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
188 |
x label style={at={(1.05,0.0)}},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
189 |
ylabel={time in secs},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
190 |
enlargelimits=false,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
191 |
xtick={0,5,...,30},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
192 |
xmax=33,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
193 |
ymax=35,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
194 |
ytick={0,5,...,30},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
195 |
scaled ticks=false,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
196 |
axis lines=left,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
197 |
width=5.5cm,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
198 |
height=4cm,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
199 |
legend entries={Python,Ruby},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
200 |
legend pos=north west,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
201 |
legend cell align=left]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
202 |
\addplot[blue,mark=*] table {re-python.data};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
203 |
\addplot[brown,mark=triangle*] table {re-ruby.data};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
204 |
\end{axis}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
205 |
\end{tikzpicture}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
206 |
\begin{tikzpicture}\footnotesize
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
207 |
\begin{axis}[
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
208 |
xlabel={$n$},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
209 |
x label style={at={(1.05,0.0)}},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
210 |
ylabel={time in secs},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
211 |
enlargelimits=false,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
212 |
xtick={0,5,...,30},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
213 |
xmax=33,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
214 |
ymax=35,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
215 |
ytick={0,5,...,30},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
216 |
scaled ticks=false,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
217 |
axis lines=left,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
218 |
width=5.5cm,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
219 |
height=4cm,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
220 |
legend entries={Java},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
221 |
legend pos=north west,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
222 |
legend cell align=left]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
223 |
\addplot[cyan,mark=*, mark options={fill=white}] table {re-java.data};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
224 |
\end{axis}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
225 |
\end{tikzpicture}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
226 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
227 |
\end{column}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
228 |
\begin{column}{.5\textwidth}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
229 |
Us (after next lecture)\medskip\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
230 |
\begin{tikzpicture}\footnotesize
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
231 |
\begin{axis}[
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
232 |
xlabel={$n$},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
233 |
x label style={at={(1.07,0.0)}},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
234 |
ylabel={time in secs},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
235 |
enlargelimits=false,
|
442
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
236 |
xtick={0,5000,...,10000},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
237 |
xmax=11000,
|
428
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
238 |
ymax=35,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
239 |
ytick={0,5,...,30},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
240 |
scaled ticks=false,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
241 |
axis lines=left,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
242 |
width=5.5cm,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
243 |
height=4cm]
|
437
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
244 |
\addplot[green,mark=square*,mark options={fill=white}] table {re2.data};
|
428
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
245 |
\addplot[black,mark=square*,mark options={fill=white}] table {re3.data};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
246 |
\end{axis}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
247 |
\end{tikzpicture}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
248 |
\begin{tikzpicture}\footnotesize
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
249 |
\begin{axis}[
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
250 |
xlabel={$n$},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
251 |
x label style={at={(1.07,0.0)}},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
252 |
ylabel={time in secs},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
253 |
enlargelimits=false,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
254 |
ymax=35,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
255 |
ytick={0,5,...,30},
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
256 |
scaled ticks=false,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
257 |
axis lines=left,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
258 |
width=5.5cm,
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
259 |
height=4cm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
260 |
\addplot[black,mark=square*,mark options={fill=white}] table {re3a.data};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
261 |
\end{axis}
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
262 |
\end{tikzpicture}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
263 |
\end{column}
|
428
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
264 |
\end{columns}\bigskip
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
265 |
|
428
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
266 |
\small\centering
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
267 |
matching \texttt{[a?]\{n\}[a]\{n\}} and \texttt{[a*]*b}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
268 |
against $\underbrace{\texttt{a}...\texttt{a}}_n$
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
269 |
\end{frame}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
270 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
271 |
|
428
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
272 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
273 |
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
274 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
275 |
\begin{frame}[c]
|
327
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
276 |
\frametitle{Lectures 1 - 5}
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
277 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
278 |
transforming strings into structured data\\[10mm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
279 |
|
|
506
|
280 |
{\LARGE\bf Lexing} {\hfill{}based on regular expressions}\medskip\\
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
281 |
\hspace{5mm}(recognising ``words'')\\[6mm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
282 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
283 |
{\LARGE\bf Parsing}\medskip\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
284 |
\hspace{5mm}(recognising ``sentences'')
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
285 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
286 |
\begin{textblock}{1}(10,9.1)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
287 |
\begin{tabular}{c}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
288 |
\includegraphics[scale=0.1]{../pics/rosetta.jpg}\\[-2mm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
289 |
\footnotesize Stone of Rosetta
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
290 |
\end{tabular}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
291 |
\end{textblock}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
292 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
293 |
\end{frame}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
294 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
295 |
|
|
1
|
296 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
297 |
\begin{frame}[t]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
298 |
\frametitle{Familiar Regular Expr.}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
299 |
\small
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
300 |
\begin{center}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
301 |
\texttt{[a-z0-9\_.-]+ @ [a-z0-9.-]+ . [a-z.]\{2,6\}}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
302 |
\end{center}\smallskip
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
303 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
304 |
\begin{center}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
305 |
\begin{tabular}{@{}lp{8.5cm}@{}}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
306 |
\pcode{re*} & matches 0 or more times\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
307 |
\pcode{re+} & matches 1 or more times\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
308 |
\pcode{re?} & matches 0 or 1 times\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
309 |
\pcode{re\{n\}} & matches exactly \pcode{n} number of times\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
310 |
\pcode{re\{n,m\}} & matches at least \pcode{n} and at most {\tt m} times\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
311 |
\pcode{[...]} & matches any single character inside the brackets\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
312 |
\pcode{[^...]} & matches any single character not inside the
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
313 |
brackets\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
314 |
\pcode{a-zA-Z} & character ranges\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
315 |
\pcode{\\d} & matches digits; equivalent to \pcode{[0-9]}\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
316 |
\pcode{.} & matches every character except newline\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
317 |
\pcode{(re)} & groups regular expressions and remembers
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
318 |
the matched text
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
319 |
\end{tabular}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
320 |
\end{center}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
321 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
322 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
323 |
\end{frame}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
324 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
325 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
326 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
1
|
327 |
\begin{frame}[c]
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
328 |
\frametitle{Today}
|
|
0
|
329 |
|
|
1
|
330 |
\begin{itemize}
|
332
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
331 |
\item While the ultimate goal is to implement a small compiler
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
332 |
(a really small one for the JVM)\ldots\bigskip
|
|
1
|
333 |
\end{itemize}
|
|
|
334 |
|
|
|
335 |
Let's start with:
|
|
|
336 |
|
|
|
337 |
\begin{itemize}
|
|
|
338 |
\item a web-crawler
|
|
|
339 |
\item an email harvester
|
332
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
340 |
\item \textcolor{gray}{(a web-scraper)}
|
|
1
|
341 |
\end{itemize}
|
|
|
342 |
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
343 |
\end{frame}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
344 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
0
|
345 |
|
|
2
|
346 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
3
|
347 |
\begin{frame}[t]
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
348 |
\frametitle{A Web-Crawler}
|
|
2
|
349 |
|
|
3
|
350 |
\mbox{}\\[10mm]
|
|
|
351 |
|
|
2
|
352 |
\begin{enumerate}
|
|
|
353 |
\item given an URL, read the corresponding webpage
|
|
|
354 |
\item extract all links from it
|
|
|
355 |
\item call the web-crawler again for all these links
|
|
|
356 |
\end{enumerate}
|
|
|
357 |
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
358 |
\end{frame}
|
|
2
|
359 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
360 |
|
|
|
361 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
362 |
\mode<presentation>{
|
|
3
|
363 |
\begin{frame}[t]
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
364 |
\frametitle{A Web-Crawler}
|
|
2
|
365 |
|
|
3
|
366 |
\mbox{}\\[10mm]
|
|
|
367 |
|
|
|
368 |
|
|
2
|
369 |
\begin{enumerate}
|
|
|
370 |
\item given an URL, read the corresponding webpage
|
|
|
371 |
\item if not possible print, out a problem
|
|
|
372 |
\item if possible, extract all links from it
|
|
|
373 |
\item call the web-crawler again for all these links
|
|
|
374 |
\end{enumerate}\bigskip\pause
|
|
|
375 |
|
|
3
|
376 |
\small (we need a bound for the number of recursive calls)
|
|
2
|
377 |
|
|
|
378 |
\small (the purpose is to check all links on my own webpage)
|
|
|
379 |
\end{frame}}
|
|
|
380 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
381 |
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
382 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
383 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
384 |
\begin{frame}[c]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
385 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
386 |
\begin{textblock}{1}(2,5)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
387 |
\begin{tabular}{c}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
388 |
\includegraphics[scale=0.15]{pics/servers.png}\\[-2mm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
389 |
\small Server
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
390 |
\end{tabular}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
391 |
\end{textblock}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
392 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
393 |
\begin{textblock}{1}(5.6,4)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
394 |
\begin{tikzpicture}[scale=1.1]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
395 |
\draw[white] (0,1) node (X) {};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
396 |
\draw[white] (2,1) node (Y) {};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
397 |
\draw[white] (0,0) node (X1) {};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
398 |
\draw[white] (2,0) node (Y1) {};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
399 |
\draw[white] (0,-1) node (X2) {};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
400 |
\draw[white] (2,-1) node (Y2) {};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
401 |
\draw[red, <-, line width = 2mm] (X) -- (Y);
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
402 |
\node [inner sep=5pt,label=above:\textcolor{black}{GET request}] at ($ (X)!.5!(Y) $) {};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
403 |
\draw[red, ->, line width = 2mm] (X1) -- (Y1);
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
404 |
\node [inner sep=5pt,label=above:\textcolor{black}{webpage}] at ($ (X1)!.5!(Y1) $) {};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
405 |
\draw[red, <-, line width = 2mm] (X2) -- (Y2);
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
406 |
\node [inner sep=7pt,label=above:\textcolor{black}{POST data}] at ($ (X2)!.5!(Y2) $) {};
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
407 |
\end{tikzpicture}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
408 |
\end{textblock}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
409 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
410 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
411 |
\begin{textblock}{1}(9,5.5)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
412 |
\begin{tabular}{c}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
413 |
\includegraphics[scale=0.15]{pics/laptop.png}\\[-2mm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
414 |
\small Browser
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
415 |
\end{tabular}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
416 |
\end{textblock}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
417 |
\end{frame}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
418 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
419 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
420 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
421 |
|
|
0
|
422 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
423 |
\begin{frame}[c]
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
424 |
\frametitle{Scala}
|
|
1
|
425 |
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
426 |
\small A simple Scala function for reading webpages:
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
427 |
\smallskip
|
|
0
|
428 |
|
98
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
429 |
\footnotesize
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
430 |
\lstinputlisting{../progs/app0.scala}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
431 |
\medskip\pause
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
432 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
433 |
\lstinline{get_page("""http://www.inf.kcl.ac.uk/staff/urbanc/""")}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
434 |
\bigskip\medskip\pause
|
|
0
|
435 |
|
|
3
|
436 |
|
428
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
437 |
\small A slightly more complicated version for handling errors:
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
438 |
\smallskip
|
|
2
|
439 |
|
98
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
440 |
\footnotesize
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
441 |
\lstinputlisting{../progs/app1.scala}
|
|
1
|
442 |
|
|
0
|
443 |
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
444 |
\end{frame}
|
|
0
|
445 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
446 |
|
98
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
447 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
448 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
449 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
3
|
450 |
\begin{frame}[t]
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
451 |
\frametitle{A Regular Expression}
|
|
3
|
452 |
|
|
|
453 |
\begin{itemize}
|
|
|
454 |
\item \ldots{} is a pattern or template for specifying strings
|
|
|
455 |
\end{itemize}\bigskip
|
|
|
456 |
|
|
|
457 |
\begin{center}
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
458 |
\only<1>{\scode{"https?://[^"]*"}}%
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
459 |
\only<2>{\scode{""""https?://[^"]*"""".r}}
|
|
3
|
460 |
\end{center}\bigskip\bigskip
|
|
|
461 |
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
462 |
matches for example\smallskip\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
463 |
\hspace{2mm}\code{"http://www.foobar.com"}\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
464 |
\hspace{2mm}\code{"https://www.tls.org"}\\
|
|
3
|
465 |
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
466 |
\end{frame}
|
|
3
|
467 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
468 |
|
|
|
469 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
470 |
\begin{frame}[t]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
471 |
\frametitle{Finding Operations}
|
|
0
|
472 |
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
473 |
{\bf\code{rexp.findAllIn(string)}}\medskip
|
|
3
|
474 |
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
475 |
returns a list of all (sub)strings that match the
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
476 |
regular expression
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
477 |
\bigskip\bigskip
|
|
0
|
478 |
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
479 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
480 |
{\bf\code{rexp.findFirstIn(string)}}\medskip
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
481 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
482 |
returns either
|
|
0
|
483 |
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
484 |
\begin{itemize}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
485 |
\item \code{None} if no (sub)string matches or
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
486 |
\item \code{Some(s)} with the first (sub)string
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
487 |
\end{itemize}
|
|
0
|
488 |
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
489 |
\end{frame}
|
|
0
|
490 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
491 |
|
|
|
492 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
3
|
493 |
\begin{frame}[c]
|
|
0
|
494 |
|
|
3
|
495 |
\footnotesize
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
496 |
\lstinputlisting{../progs/app2.scala}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
497 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
498 |
\end{frame}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
499 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
0
|
500 |
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
501 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
502 |
\begin{frame}[c]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
503 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
504 |
\small
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
505 |
A version that only crawls links in ``my'' domain:
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
506 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
507 |
\footnotesize
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
508 |
\lstinputlisting{../progs/app3.scala}
|
|
0
|
509 |
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
510 |
\end{frame}
|
|
0
|
511 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
512 |
|
|
|
513 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
514 |
\begin{frame}[c]
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
515 |
\lstset{xleftmargin=-4mm}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
516 |
\small
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
517 |
A little email harvester:
|
|
3
|
518 |
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
519 |
\footnotesize
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
520 |
\lstinputlisting{../progs/app4.scala}\bigskip
|
|
3
|
521 |
|
|
|
522 |
\tiny
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
523 |
\url{http://net.tutsplus.com/tutorials/other/8-regular-expressions-you-should-know/}
|
|
3
|
524 |
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
525 |
\end{frame}
|
|
3
|
526 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
527 |
|
|
|
528 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
14
|
529 |
\begin{frame}[t]
|
|
506
|
530 |
\frametitle{Regular Expressions}
|
|
0
|
531 |
|
330
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
532 |
Their inductive definition:
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
533 |
|
|
14
|
534 |
|
330
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
535 |
\begin{textblock}{6}(2,7.5)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
536 |
\begin{tabular}{@ {}rrl@ {\hspace{13mm}}l}
|
428
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
537 |
\bl{$r$} & \bl{$::=$} & \bl{$\ZERO$} & null\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
538 |
& \bl{$\mid$} & \bl{$\ONE$} & empty string / \pcode{""} / $[]$\\
|
330
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
539 |
& \bl{$\mid$} & \bl{$c$} & character\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
540 |
& \bl{$\mid$} & \bl{$r_1 + r_2$} & alternative / choice\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
541 |
& \bl{$\mid$} & \bl{$r_1 \cdot r_2$} & sequence\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
542 |
& \bl{$\mid$} & \bl{$r^*$} & star (zero or more)\\
|
|
3
|
543 |
\end{tabular}
|
|
|
544 |
\end{textblock}
|
|
|
545 |
|
330
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
546 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
547 |
\only<2->{\footnotesize
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
548 |
\begin{textblock}{9}(2,0.5)
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
549 |
\begin{bubble}[9.8cm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
550 |
\lstinputlisting{../progs/app01.scala}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
551 |
\end{bubble}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
552 |
\end{textblock}}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
553 |
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
554 |
\end{frame}
|
|
3
|
555 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
556 |
|
|
|
557 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
506
|
558 |
%\begin{frame}[t]
|
|
|
559 |
%\frametitle{Regular Expressions}
|
|
|
560 |
%
|
|
|
561 |
%\small
|
|
|
562 |
%In Scala:\bigskip
|
|
|
563 |
%
|
|
|
564 |
%\footnotesize
|
|
|
565 |
%\lstinputlisting{../progs/app51.scala}
|
|
|
566 |
%
|
|
|
567 |
%
|
|
|
568 |
%\end{frame}
|
|
0
|
569 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
570 |
|
|
|
571 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
572 |
\begin{frame}[t]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
573 |
\frametitle{Strings}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
574 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
575 |
\ldots are lists of characters. For example \code{"hello"}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
576 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
577 |
\begin{center}
|
330
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
578 |
\bl{$[h, e, l, l, o]$} or just \bl{$hello$}
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
579 |
\end{center}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
580 |
|
330
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
581 |
the empty string: \bl{$[]$} or \bl{\pcode{""}}\bigskip\\
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
582 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
583 |
the concatenation of two strings:
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
584 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
585 |
\begin{center}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
586 |
\bl{$s_1 \,@\, s_2$}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
587 |
\end{center}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
588 |
|
330
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
589 |
\bl{\textit{foo $@$ bar = foobar}, \textit{baz $@\, []$ = baz}}
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
590 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
591 |
\end{frame}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
592 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
593 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
594 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
330
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
595 |
\begin{frame}[c]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
596 |
\frametitle{Languages, Strings}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
597 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
598 |
\begin{itemize}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
599 |
\item \alert{\bf Strings} are lists of characters, for example
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
600 |
\begin{center}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
601 |
\bl{$[]$},\;\bl{$abc$} \hspace{2cm}(Pattern match: \bl{$c\!::\!s$})
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
602 |
\end{center}\bigskip
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
603 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
604 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
605 |
\item A \alert{\bf language} is a set of strings, for example\medskip
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
606 |
\begin{center}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
607 |
\bl{$\{[], hello, \textit{foobar}, a, abc\}$}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
608 |
\end{center}\bigskip
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
609 |
|
332
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
610 |
\item \alert{\bf Concatenation} of strings and languages
|
330
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
611 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
612 |
\begin{center}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
613 |
\begin{tabular}{rcl}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
614 |
\bl{$\textit{foo}\;@\;bar$} & \bl{$=$} & \bl{$\textit{foobar}$}\medskip\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
615 |
\bl{$A\;@\;B$} & \bl{$\dn$} & \bl{$\{ s_1\,@\,s_2 \;\mid\; s_1 \in A \wedge s_2 \in B\}$}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
616 |
\end{tabular}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
617 |
\end{center}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
618 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
619 |
%\item The \alert{\bf meaning} of a regular expression is a set of
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
620 |
% strings, or language.
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
621 |
\end{itemize}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
622 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
623 |
\end{frame}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
624 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
625 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
626 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
627 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
0
|
628 |
\mode<presentation>{
|
|
|
629 |
\begin{frame}[c]
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
630 |
\frametitle{\begin{tabular}{c}The Meaning of a\\[-2mm]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
631 |
Regular Expression\end{tabular}}
|
|
0
|
632 |
|
|
4
|
633 |
\begin{textblock}{15}(1,4)
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
634 |
\begin{tabular}{rcl}
|
428
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
635 |
\bl{$L(\ZERO)$} & \bl{$\dn$} & \bl{$\{\}$}\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
636 |
\bl{$L(\ONE)$} & \bl{$\dn$} & \bl{$\{[]\}$}\\
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
637 |
\bl{$L(c)$} & \bl{$\dn$} & \bl{$\{[c]\}$}\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
638 |
\bl{$L(r_1 + r_2)$} & \bl{$\dn$} & \bl{$L(r_1) \cup L(r_2)$}\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
639 |
\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
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
640 |
\bl{$L(r^*)$} & \bl{$\dn$} & \onslide<4->{\bl{$\bigcup_{0 \le n} L(r)^n$}}\\
|
|
4
|
641 |
\end{tabular}\bigskip
|
|
3
|
642 |
|
|
4
|
643 |
\onslide<2->{
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
644 |
\hspace{5mm}\bl{$L(r)^0 \;\dn\; \{[]\}$}\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
645 |
\bl{$L(r)^{n+1} \;\dn\; L(r) \,@\, L(r)^n$}\hspace{9mm}\onslide<3->{\small\textcolor{gray}{(append on sets)}\\
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
646 |
\small\hspace{5cm}\textcolor{gray}{$\{ s_1 @ s_2 \;|\; s_1\in L(r) \wedge s_2 \in L(r)^n \}$}}
|
|
4
|
647 |
}
|
|
|
648 |
\end{textblock}
|
|
|
649 |
|
|
0
|
650 |
\end{frame}}
|
|
|
651 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
652 |
|
|
5
|
653 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
654 |
\begin{frame}[c]
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
655 |
\frametitle{The Meaning of Matching}
|
|
5
|
656 |
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
657 |
\begin{bubble}[10cm]
|
|
5
|
658 |
\large
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
659 |
A regular expression \bl{$r$} matches a string \bl{$s$}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
660 |
provided
|
|
5
|
661 |
|
|
|
662 |
\begin{center}
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
663 |
\bl{$s \in L(r)$}\\
|
|
5
|
664 |
\end{center}
|
330
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
665 |
\end{bubble}\bigskip\bigskip
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
666 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
667 |
\ldots and the point of the next lecture is
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
668 |
to decide this problem as fast as possible (unlike Python,
|
428
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
669 |
Ruby, Java)
|
|
5
|
670 |
|
254
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
671 |
\end{frame}
|
|
5
|
672 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
673 |
|
|
0
|
674 |
|
|
|
675 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
676 |
\begin{frame}[c]
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
677 |
\frametitle{Written Exam}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
678 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
679 |
\begin{itemize}
|
428
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
680 |
\item Accounts for 80\%.\bigskip
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
681 |
|
330
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
682 |
\item You will understand the question ``\textit{Is this relevant for
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
683 |
the exam?}'' is very demotivating for the lecturer!\bigskip\\
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
684 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
685 |
\item Deal: Whatever is in the homework (and is not marked
|
330
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
686 |
``\textit{optional}'') is relevant for the exam.\bigskip
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
687 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
688 |
\item Each lecture has also a handout. There are also handouts about
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
689 |
notation and Scala.
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
690 |
\end{itemize}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
691 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
692 |
\end{frame}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
693 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
694 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
695 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
696 |
\begin{frame}[t]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
697 |
\frametitle{Coursework}
|
|
0
|
698 |
|
|
|
699 |
\begin{itemize}
|
428
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
700 |
\item Accounts for 20\%. Two strands. Choose \alert{\bf one}!\bigskip
|
|
0
|
701 |
\end{itemize}
|
|
|
702 |
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
703 |
\begin{columns}[t]
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
704 |
\begin{column}{.5\textwidth}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
705 |
\underline{\bf Strand 1}\medskip
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
706 |
\begin{itemize}
|
428
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
707 |
\item four programming tasks:
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
708 |
\begin{itemize}
|
|
506
|
709 |
\item matcher (4\%, 19.10.)
|
428
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
710 |
\item lexer (5\%, 03.11.)
|
|
506
|
711 |
\item parser (5\%, 23.11.)
|
|
|
712 |
\item compiler (6\%, 7.12.)
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
713 |
\end{itemize}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
714 |
\end{itemize}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
715 |
\end{column}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
716 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
717 |
\hspace{-45pt}\vrule{}\hspace{10pt}
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
718 |
\begin{column}{.5\textwidth}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
719 |
\underline{\bf Strand 2}\smallskip\begin{itemize}
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
720 |
\item one task: prove the correctness of a regular expression matcher in
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
721 |
the Isabelle theorem prover
|
|
506
|
722 |
\item 20\%, submission 7.12.
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
723 |
\end{itemize}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
724 |
\end{column}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
725 |
\end{columns}\medskip
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
726 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
727 |
\small
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
728 |
\begin{itemize}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
729 |
\item Solving more than one strand will {\bf not} give you more
|
|
506
|
730 |
marks.
|
|
|
731 |
|
253
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
732 |
\end{itemize}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
733 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
734 |
\end{frame}
|
|
0
|
735 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
736 |
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
737 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
738 |
\begin{frame}[c]
|
|
506
|
739 |
\frametitle{Lecture Capture}
|
|
|
740 |
|
|
|
741 |
\begin{itemize}
|
|
|
742 |
\item Hope it works\ldots\medskip\pause
|
|
|
743 |
\item It is important to use lecture capture wisely:
|
|
|
744 |
\begin{itemize}
|
|
|
745 |
\item Lecture recordings are a study and revision aid.
|
|
|
746 |
\item Statistically, there is a clear and direct link between attendance and
|
|
|
747 |
attainment: Students who do not attend lectures, do less well in exams.
|
|
|
748 |
\end{itemize}
|
|
|
749 |
|
|
|
750 |
\item Attending a lecture is more than watching it online -- if you do not
|
|
|
751 |
attend, you miss out!
|
|
|
752 |
|
|
|
753 |
\end{itemize}
|
|
|
754 |
|
|
|
755 |
\end{frame}
|
|
|
756 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
757 |
|
|
|
758 |
|
|
|
759 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
760 |
\begin{frame}[c]
|
255
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
761 |
\frametitle{\begin{tabular}{c}\\[3cm]\alert{Questions?}\end{tabular}}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
762 |
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
763 |
\mbox{}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
764 |
\end{frame}
|
Christian Urban <christian dot urban at kcl dot ac dot uk>
diff
changeset
|
765 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
0
|
766 |
\end{document}
|
|
|
767 |
|
|
|
768 |
%%% Local Variables:
|
|
|
769 |
%%% mode: latex
|
|
|
770 |
%%% TeX-master: t
|
|
|
771 |
%%% End:
|
|
|
772 |
|