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
|
-- This file is part of SmartEiffel The GNU Eiffel Compiler Tools and Libraries
--
-- SmartEiffel 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, or (at your option) any later
-- version.
-- SmartEiffel 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 SmartEiffel; see the file COPYING. If not, write to
-- the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
-- MA 02111-1307, USA.
--
-- Copyright(C) 1994-2002: INRIA - LORIA (INRIA Lorraine) - ESIAL U.H.P.
-- - University of Nancy 1 - FRANCE
-- Copyright(C) 2003: INRIA - LORIA (INRIA Lorraine) - I.U.T. Charlemagne
-- - University of Nancy 2 - FRANCE
--
-- Dominique COLNET, Suzanne COLLIN, Olivier ZENDRA,
-- Philippe RIBET, Cyril ADRIAN
--
-- http://SmartEiffel.loria.fr - SmartEiffel@loria.fr
--
class FORMAL_GENERIC_ARG
--
-- To store one formal generic argument.
--
inherit
GLOBALS
VISITABLE
creation make
feature {FORMAL_GENERIC_ARG_VISITOR}
accept(visitor: FORMAL_GENERIC_ARG_VISITOR) is
do
visitor.visit_formal_generic_arg(Current)
end
feature
name: CLASS_NAME
-- Name of the formal generic argument.
constraint: E_TYPE
-- Non Void if any.
rank: INTEGER
-- In the corresponding declation list.
constrained: BOOLEAN is
do
Result := (constraint /= void)
end
start_position: POSITION is
do
Result := name.start_position
end
pretty_print is
do
name.pretty_print
if constrained then
pretty_printer.indent_level_increment
pretty_printer.put_string(once "->")
constraint.pretty_print
pretty_printer.indent_level_decrement
end
end
short is
do
short_print.a_magic_class_name(name)
if constrained then
short_print.hook_or("arrow","->")
constraint.short
end
end
feature {FORMAL_GENERIC_LIST}
check_generic_formal_arguments is
do
if smart_eiffel.loaded_base_class(name) /= Void then
error_handler.add_position(name.start_position)
error_handler.append(
"A formal generic argument must not be the %
%name of an existing class (VCFG.1).")
error_handler.print_as_fatal_error
end
end
set_rank(r: like rank) is
require
r > 0
do
rank := r
ensure
rank = r
end
constraint_substitution(fga: like Current; r: INTEGER) is
-- Substitute in the previously read `Current' `constraint'
-- all occurrences of `fga' which will be added at rank `r'.
local
fgan: STRING; cn: CLASS_NAME
do
if constraint /= Void then
fgan := fga.name.to_string
if constraint.is_generic then
substitute(constraint.generic_list,fga,r,fgan)
else
cn := constraint.base_class_name
if fgan = cn.to_string then
create {TYPE_FORMAL_GENERIC} constraint.make(cn, fga, r)
end
end
end
end
feature {NONE}
substitute(gl: ARRAY[E_TYPE]; fga: like Current; r: INTEGER; fgan: STRING) is
-- Substitute recursively all occurrences of `fgan' in `gl'.
require
gl /= Void
fgan = fga.name.to_string
local
i: INTEGER
tfg: TYPE_FORMAL_GENERIC
t: E_TYPE
cn: CLASS_NAME
do
from
i := gl.upper
until
i < gl.lower
loop
t := gl.item(i)
if t.is_generic then
substitute(t.generic_list,fga,r,fgan)
else
cn := t.base_class_name
if fgan = cn.to_string then
!!tfg.make(cn,fga,r)
gl.put(tfg,i)
end
end
i := i - 1
end
end
make(n: like name; c: like constraint) is
require
n /= Void
do
name := n
constraint := c
ensure
name = n
constraint = c
end
invariant
name /= Void
end -- FORMAL_GENERIC_ARG
|
