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
|
########################################################################
#
# filedb is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; see the file COPYING. If not, write to
# the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
#
########################################################################
#
# Project : File Preprocessor - filedb database module
# Filename : $RCSfile: filedb.pm,v $
# Author : $Author: darren $
# Maintainer : Darren Miller: darren@cabaret.demon.co.uk
# File version : $Revision: 1.5 $
# Last changed : $Date: 2002/11/03 22:18:37 $
# Description : Implements a simple database as a filepp module
# Licence : GNU copyleft
#
########################################################################
# THIS IS A FILEPP MODULE, YOU NEED FILEPP TO USE IT!!!
# usage: filepp -m filedb.pm <files>
########################################################################
package Filedb;
use strict;
# version number of module
my $VERSION = '0.1.0';
Filepp::Error("The filedb module is not fully implmented yet!");
########################################################################
# main filedb data structures
########################################################################
# hash of all tables, has form:
# hash index = table name
# hash entry = (@Fields)
my %Tables = ();
# hash of all table separators, has form:
# hash index = table name
# hash entry = $separator
my %Separators = ();
# hash of all table entries, has form:
# hash index = table name
# hash entry = (%Entries)
# %Entries is a hash of all the entries in the table and has form:
# hash index = first column of table
# hash entry = (@Entries) (includes first entry)
my %Entries = ();
########################################################################
# Table keyword, creates a new table in the data base,
# takes inputs (as one space separated string) :
# tablename - name of table
# separator - separator used when entering fields in table
# note: the separator can not appear in any fields in the table!
# list of space separated fields - each field is the name of a column in
# the table
########################################################################
sub Table
{
my $input = shift;
my ($name, $separator, @Fields) = split(/\s+/, $input);
print("Table name: \"$name\"\n");
print("Table separator: \"$separator\"\n");
my $field;
foreach $field (@Fields) {
print("Field: \"$field\"\n");
}
# enter new table into tables
$Tables{$name} = \@Fields;
# enter separator
$Separators{$name} = $separator;
}
########################################################################
# Add the table keyword
########################################################################
Filepp::AddKeyword("table", \&Table);
########################################################################
# Insert keyword, adds an entry to a table,
# takes inputs (as one space separated string) :
# tablename - name of table
# separator - separator used when entering fields in table
# note: the separator can not appear in any fields in the table!
# list of space separated fields - each field is the name of a column in
# the table
########################################################################
sub Insert
{
my $input = shift;
my ($table, $entry) = split(/\s+/, $input, 2);
# check the table exists
if(!exists($Tables{$table})) {
Filepp::Warning("Table $table not found");
return;
}
# split up entry and add it to table
my $numfields = @{$Tables{$table}};
my @Entry = split(/$Separators{$table}/, $entry, $numfields);
# pad with blanks if needed
while($#Entry < $numfields-1) { push(@Entry, ""); }
# add to hash
$ {$Entries{$table}} {$Entry[0]} = \@Entry;
}
########################################################################
# Add the insert keyword
########################################################################
Filepp::AddKeyword("insert", \&Insert);
########################################################################
# Select keyword, prints a table,
# takes inputs (as one space separated string) :
# tablename - name of table
########################################################################
sub Select
{
my ($items, $tables, $conditions);
my $input = shift;
($items, $input) = split(/\s+FROM\s+/, $input, 2);
($tables, $conditions) = split(/\s+WHERE\s+/, $input, 2);
print("items <$items>, tables <$tables>, conditions <$conditions>\n");
my @Items = split(/\s*,\s*/, $items);
foreach $items (@Items) {
print("item: <$items>\n");
}
my @Tables = split(/\s*,\s*/, $tables);
foreach $tables (@Tables) {
print("table: <$tables>\n");
}
my @Conditions = split(/\s*,\s*/, $conditions);
foreach $conditions (@Conditions) {
print("condition: <$conditions>\n");
}
}
########################################################################
# Add the select keyword
########################################################################
Filepp::AddKeyword("select", \&Select);
########################################################################
# List a whole table
########################################################################
sub List
{
my $table = shift;
my $field;
print("Table:\t");
foreach $field (@{$Tables{$table}}) { print("$field\t"); }
print("\n");
my @Fields = sort( keys( %{$Entries{$table}} ) );
foreach $field (@Fields) {
my @Entry = @{ ${ $Entries{$table}}{$field} };
my $entry;
print("\n");
foreach $entry (@Entry) { print("Entry: $entry\n"); }
}
}
########################################################################
# Add the list keyword
########################################################################
Filepp::AddKeyword("list", \&List);
return 1;
########################################################################
# End of file
########################################################################
|
