1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
<HTML>
<HEAD>
<!-- This HTML file has been created by texi2html 1.29
from ../tnf/prop.tnf on 12 Febuary 2003 -->
<TITLE>Association of properties to definitions - Count Occurrences of Objects</TITLE>
</HEAD>
<BODY TEXT="#000000" BGCOLOR="#FFFFFF" LINK="#0000EE" VLINK="#551A8B" ALINK="#FF0000" BACKGROUND="gifs/bg.gif">
<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0" VALIGN=BOTTOM>
<TR VALIGN=BOTTOM>
<TD WIDTH="160" VALIGN=BOTTOM><IMG SRC="gifs/elilogo.gif" BORDER=0> </TD>
<TD WIDTH="25" VALIGN=BOTTOM><img src="gifs/empty.gif" WIDTH=25 HEIGHT=25></TD>
<TD ALIGN=LEFT WIDTH="600" VALIGN=BOTTOM><IMG SRC="gifs/title.gif"></TD>
</TR>
</TABLE>
<HR size=1 noshade width=785 align=left>
<TABLE BORDER=0 CELLSPACING=2 CELLPADDING=0>
<TR>
<TD VALIGN=TOP WIDTH="160">
<h4>General Information</h4>
<table BORDER=0 CELLSPACING=0 CELLPADDING=0>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="index.html">Eli: Translator Construction Made Easy</a></td></tr>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="gindex_toc.html">Global Index</a></td></tr>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="faq_toc.html" >Frequently Asked Questions</a> </td></tr>
</table>
<h4>Tutorials</h4>
<table BORDER=0 CELLSPACING=0 CELLPADDING=0>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="EliRefCard_toc.html">Quick Reference Card</a></td></tr>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="novice_toc.html">Guide For new Eli Users</a></td></tr>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="news_toc.html">Release Notes of Eli</a></td></tr>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="nametutorial_toc.html">Tutorial on Name Analysis</a></td></tr>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="typetutorial_toc.html">Tutorial on Type Analysis</a></td></tr>
</table>
<h4>Reference Manuals</h4>
<table BORDER=0 CELLSPACING=0 CELLPADDING=0>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="ui_toc.html">User Interface</a></td></tr>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="pp_toc.html">Eli products and parameters</a></td></tr>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="lidoref_toc.html">LIDO Reference Manual</a></td></tr>
</table>
<h4>Libraries</h4>
<table BORDER=0 CELLSPACING=0 CELLPADDING=0>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="lib_toc.html">Eli library routines</a></td></tr>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="modlib_toc.html">Specification Module Library</a></td></tr>
</table>
<h4>Translation Tasks</h4>
<table BORDER=0 CELLSPACING=0 CELLPADDING=0>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="lex_toc.html">Lexical analysis specification</a></td></tr>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="syntax_toc.html">Syntactic Analysis Manual</a></td></tr>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="comptrees_toc.html">Computation in Trees</a></td></tr>
</table>
<h4>Tools</h4>
<table BORDER=0 CELLSPACING=0 CELLPADDING=0>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="lcl_toc.html">LIGA Control Language</a> </td></tr>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="show_toc.html">Debugging Information for LIDO</a> </td></tr>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="gorto_toc.html">Graphical ORder TOol</a> </td></tr>
</table>
<p>
<table BORDER=0 CELLSPACING=0 CELLPADDING=0>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="fw_toc.html">FunnelWeb User's Manual</a> </td></tr>
</table>
<p>
<table BORDER=0 CELLSPACING=0 CELLPADDING=0>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="ptg_toc.html">Pattern-based Text Generator</a> </td></tr>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="deftbl_toc.html">Property Definition Language</a> </td></tr>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="oil_toc.html">Operator Identification Language</a> </td></tr>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="tp_toc.html">Tree Grammar Specification Language</a> </td></tr>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="clp_toc.html">Command Line Processing</a> </td></tr>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="cola_toc.html">COLA Options Reference Manual</a> </td></tr>
</table>
<p>
<table BORDER=0 CELLSPACING=0 CELLPADDING=0>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="idem_toc.html">Generating Unparsing Code</a> </td></tr>
</table>
<p>
<table BORDER=0 CELLSPACING=0 CELLPADDING=0>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="mon_toc.html">Monitoring a Processor's Execution</a> </td></tr>
</table>
<h4>Administration</h4>
<table BORDER=0 CELLSPACING=0 CELLPADDING=0>
<tr valign=top><td><img src="gifs/gelbekugel.gif" WIDTH=7 HEIGHT=7 ALT=" o"> </td><td><a href="sysadmin_toc.html">System Administration Guide</a> </td></tr>
</table>
<HR WIDTH="100%">
<CENTER> <A HREF="mailto:elibugs@cs.colorado.edu"><IMG SRC="gifs/button_mail.gif" NOSAVE BORDER=0 HEIGHT=32 WIDTH=32></A><A HREF="mailto:elibugs@cs.colorado.edu">Questions, Comments, ....</A></CENTER>
</TD>
<TD VALIGN=TOP WIDTH="25"><img src="gifs/empty.gif" WIDTH=25 HEIGHT=25></TD>
<TD VALIGN=TOP WIDTH="600">
<H1>Association of properties to definitions</H1>
<P>
<IMG SRC="gifs/empty.gif" WIDTH=25 HEIGHT=25 ALT=""><A HREF="prop_1.html"><IMG SRC="gifs/prev.gif" ALT="Previous Chapter" BORDER="0"></A>
<IMG SRC="gifs/empty.gif" WIDTH=25 HEIGHT=25 ALT=""><A HREF="prop_3.html"><IMG SRC="gifs/next.gif" ALT="Next Chapter" BORDER="0"></A>
<IMG SRC="gifs/empty.gif" WIDTH=25 HEIGHT=25 ALT=""><A HREF="prop_toc.html"><IMG SRC="gifs/up.gif" ALT="Table of Contents" BORDER="0"></A>
<IMG SRC="gifs/empty.gif" WIDTH=25 HEIGHT=25 ALT="">
<HR size=1 noshade width=600 align=left>
<H1><A NAME="SEC2" HREF="prop_toc.html#SEC2">Count Occurrences of Objects</A></H1>
<A NAME="IDX10"></A>
<A NAME="IDX11"></A>
<P>
The computations of this module enumerate certain occurrences of
objects represented by symbols that have a <CODE>Key</CODE> attribute.
That are usually certain occurrences of identifiers.
<P>
The information computed by the module may be used for different purposes,
e.g. for statistics about the input text, checks for unique occurrences,
computations at the first or the last occurrence, etc.
<P>
The module is instantiated by
<PRE>
$/Prop/OccCnt.gnrc+instance=NAME +referto=KEY :inst
</PRE>
<A NAME="IDX12"></A>
<A NAME="IDX13"></A>
<P>
The module provides two computational roles,
<CODE>NAMECount</CODE> and <CODE>NAMETotalCnt</CODE>.
The roles may be associated to one or several grammar symbols.
<A NAME="IDX14"></A>
<P>
The role <CODE>NAMERangeCnt</CODE> is automatically
associated to the grammar root. It usually need not
be used. It is not intended to provide separate counting
in different parts of the tree (see <A HREF="prop_1.html#SEC1">Common Aspects of Property Modules</A>).
<A NAME="IDX15"></A>
<A NAME="IDX16"></A>
<A NAME="IDX17"></A>
<P>
Let <CODE>k</CODE> be a key, then all occurrences of <CODE>k</CODE> in a
<CODE>NAMECount</CODE> context are enumerated in left-to-right depth-first order.
The attribute <CODE>NAMECount.NAMECnt</CODE> is the number of <CODE>k</CODE>'s
occurrence with respect to this order. The total number of
occurrences of <CODE>k</CODE> is associated as the property <CODE>NAMECnt</CODE>
to <CODE>k</CODE>. The role <CODE>NAMETotalCnt</CODE> makes it available
as an attribute <CODE>NAMETotalCnt.NAMETotalCnt</CODE>.
If the <CODE>NAMECnt</CODE> property is accessed directly in user's computations,
those have to state <CODE>NAMERangeCnt.GotNAMECnt</CODE> as precondition.
<P>
In (see <A HREF="prop_1.html#SEC1">Common Aspects of Property Modules</A>), we explained how to associate these rule to
grammar symbols in order to check for multiply definitions:
<P>
<PRE>
SYMBOL MultDefChk INHERITS Count, TotalCnt END;
SYMBOL DefIdent INHERITS MultDefChk END;
SYMBOL ClassDefIdent INHERITS MultDefChk END;
SYMBOL ModDefIdent INHERITS MultDefChk END;
</PRE>
<P>
The check is completed by using the results of this module in
computations associated to <CODE>MultDefChk</CODE>:
<P>
<PRE>
SYMBOL MultDefChk COMPUTE
IF (GT (THIS.TotalCnt, 1),
message (ERROR, CatStrInd ("identifier is multiply defined: ", THIS.Sym),
0, COORDREF));
END;
</PRE>
<P>
The following example demonstrates a different application of this module.
Assume we want to print how often each object in a program is
referenced in some context. Hence, any identifier occurrence
has to be counted. To avoid that this module application
collides with the previous, we have to use a different instance of the
<CODE>OccCnt</CODE> module:
<P>
<PRE>
$/Prop/OccCnt.gnrc +instance=Prnt:inst
</PRE>
<P>
That is easily achieved by associating the
<CODE>Count</CODE> and the <CODE>TotalCnt</CODE> roles to the role
<CODE>IdentOcc</CODE> previously introduced in our running example:
<P>
<PRE>
SYMBOL IdentOcc INHERITS PrntCount, PrntTotalCnt COMPUTE
IF (EQ (THIS.PrntCnt, 1),
printf ("identifier %s occurs %d times\n",
StringTable (THIS.Sym), THIS.PrntTotalCnt));
END;
</PRE>
<P>
<HR size=1 noshade width=600 align=left>
<P>
<IMG SRC="gifs/empty.gif" WIDTH=25 HEIGHT=25 ALT=""><A HREF="prop_1.html"><IMG SRC="gifs/prev.gif" ALT="Previous Chapter" BORDER="0"></A>
<IMG SRC="gifs/empty.gif" WIDTH=25 HEIGHT=25 ALT=""><A HREF="prop_3.html"><IMG SRC="gifs/next.gif" ALT="Next Chapter" BORDER="0"></A>
<IMG SRC="gifs/empty.gif" WIDTH=25 HEIGHT=25 ALT=""><A HREF="prop_toc.html"><IMG SRC="gifs/up.gif" ALT="Table of Contents" BORDER="0"></A>
<IMG SRC="gifs/empty.gif" WIDTH=25 HEIGHT=25 ALT="">
<HR size=1 noshade width=600 align=left>
</TD>
</TR>
</TABLE>
</BODY></HTML>
|
