1 \documentclass[a4paper]{article}
6 \newcommand{\MATITA}{\ding{46}\textsf{Matita}}
9 \title{Extensible notation for \MATITA}
10 \author{Luca Padovani \qquad Stefano Zacchiroli \\
11 \small Department of Computer Science, University of Bologna \\
12 \small Mura Anteo Zamboni, 7 -- 40127 Bologna, ITALY \\
13 \small \{\texttt{lpadovan}, \texttt{zacchiro}\}\texttt{@cs.unibo.it}}
15 \newcommand{\BREAK}{\mathtt{break}}
16 \newcommand{\TVAR}[1]{#1:\mathtt{term}}
17 \newcommand{\NVAR}[1]{#1:\mathtt{number}}
18 \newcommand{\IVAR}[1]{#1:\mathtt{name}}
27 V & ::= & & \mbox{(\bf values)} \\
28 & & \verb+Term+~T & \mbox{(term)} \\
29 & | & \verb+String+~s & \mbox{(string)} \\
30 & | & \verb+Number+~n & \mbox{(number)} \\
31 & | & \verb+None+ & \mbox{(optional value)} \\
32 & | & \verb+Some+~V & \mbox{(optional value)} \\
33 & | & [ V^{*} ] & \mbox{(list value)} \\[2ex]
37 An environment is a map $\mathcal E : \mathit{Name} -> V$.
39 \section{Level 1: concrete syntax patterns}
43 P & ::= & & \mbox{(patterns)} \\
45 S & ::= & & \mbox{(\bf simple patterns)} \\
46 & & L_\kappa[S_1,\dots,S_n] & \mbox{(layout)} \\
47 & | & B_\kappa^{ab}[P] & \mbox{(box)} \\
48 & | & \BREAK & \mbox{(breakpoint)} \\
49 & | & (P) & \mbox{(fenced)} \\
50 & | & M & \mbox{(magic)} \\
51 & | & V & \mbox{(variable)} \\
52 & | & l & \mbox{(literal)} \\[2ex]
53 V & ::= & & \mbox{(\bf variables)} \\
54 & & \TVAR{x} & \mbox{(term variable)} \\
55 & | & \NVAR{x} & \mbox{(number variable)} \\
56 & | & \IVAR{x} & \mbox{(name variable)} \\[2ex]
57 M & ::= & & \mbox{(\bf magic patterns)} \\
58 & & \verb+list0+~S~l? & \mbox{(possibly empty list)} \\
59 & | & \verb+list1+~S~l? & \mbox{(non-empty list)} \\
60 & | & \verb+opt+~S & \mbox{(option)} \\[2ex]
64 % IOT = Instantiate Two to One
65 \newcommand{\IOT}[2]{|[#1|]_{\mathcal{#2}}}
66 \newcommand{\NAMES}{\mathit{names}}
70 \IOT{S_1\cdots S_n}{E} & = & \IOT{S_1}{E}\cdots\IOT{S_n}{E} \\
71 \IOT{L_\kappa[S_1,\dots,S_n]}{E} & = & L_\kappa[\IOT{S_1}{E},\dots,\IOT{S_n}{E} ] \\
72 \IOT{B_\kappa^{ab}[P]}{E} & = & B_\kappa^{ab}[\IOT{P}{E}] \\
73 \IOT{\BREAK}{E} & = & \BREAK \\
74 \IOT{(P)}{E} & = & (\IOT{P}{E}) \\
75 \IOT{\TVAR{x}}{E} & = & t & \mathcal{E}(x) = \verb+Term+~t \\
76 \IOT{\NVAR{x}}{E} & = & l & \mathcal{E}(x) = \verb+Number+~l \\
77 \IOT{\IVAR{x}}{E} & = & l & \mathcal{E}(x) = \verb+String+~l \\
78 \IOT{\mathtt{opt}~S}{E} & = & \varepsilon & \forall x \in \NAMES(S), \mathcal{E}(x) = \mathtt{None} \\
79 \IOT{\mathtt{opt}~S}{E} & = & \varepsilon & \forall x \in \NAMES(S), \mathcal{E}(x) = \mathtt{None} \\
81 %% & | & (P) & \mbox{(fenced)} \\
82 %% & | & M & \mbox{(magic)} \\
83 %% & | & V & \mbox{(variable)} \\
84 %% & | & l & \mbox{(literal)} \\[2ex]
85 %% V & ::= & & \mbox{(\bf variables)} \\
86 %% & & \TVAR{x} & \mbox{(term variable)} \\
87 %% & | & \NVAR{x} & \mbox{(number variable)} \\
88 %% & | & \IVAR{x} & \mbox{(name variable)} \\[2ex]
89 %% M & ::= & & \mbox{(\bf magic patterns)} \\
90 %% & & \verb+list0+~S~l? & \mbox{(possibly empty list)} \\
91 %% & | & \verb+list1+~S~l? & \mbox{(non-empty list)} \\
92 %% & | & \verb+opt+~S & \mbox{(option)} \\[2ex]
96 \section{Level 2: abstract syntax}