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
|
// file : build/scope -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef BUILD_SCOPE
#define BUILD_SCOPE
#include <functional> // function
#include <unordered_set>
#include <unordered_map>
#include <butl/path-map>
#include <build/types>
#include <build/module>
#include <build/variable>
#include <build/prerequisite>
#include <build/target-type>
#include <build/rule-map>
#include <build/operation>
namespace build
{
class scope
{
public:
const dir_path&
path () const {return *path_;} // Absolute and normalized.
const dir_path&
src_path () const {return *src_path_;} // Corresponding src path.
const dir_path* src_path_ {nullptr}; // Cached src_{root,base} var value.
scope*
parent_scope () const {return parent_;}
// Root scope of this scope or NULL if this scope is not (yet)
// in any (known) project. Note that if the scope itself is
// root, then this function return this. To get to the outer
// root, query the root scope of the parent.
//
scope*
root_scope () const {return root_;}
bool
root () const {return root_ == this;}
// Variables.
//
public:
variable_map vars;
// Lookup, including in outer scopes. If you only want to lookup
// in this scope, do it on the the variables map directly.
//
value_proxy
operator[] (const variable&) const;
value_proxy
operator[] (const std::string& name) const
{
return operator[] (variable_pool.find (name));
}
// Return a value_proxy suitable for assignment (or append if you
// only want to append to the value from this scope). If the variable
// does not exist in this scope's map, then a new one with the NULL
// value is added and returned. Otherwise the existing value is
// returned.
//
value_proxy
assign (const variable& var)
{
return vars.assign (var);
}
value_proxy
assign (const std::string& name)
{
return assign (variable_pool.find (name));
}
// Return a value_proxy suitable for appending. If the variable
// does not exist in this scope's map, then outer scopes are
// searched for the same variable. If found then a new variable
// with the found value is added to this scope and returned.
// Otherwise this function proceeds as assign().
//
value_proxy
append (const variable&);
value_proxy
append (const std::string& name)
{
return append (variable_pool.find (name));
}
// Prerequisite cache.
//
public:
prerequisite_set prerequisites;
// Meta/operations supported by this project (set on the root
// scope only).
//
meta_operation_table meta_operations;
operation_table operations;
typedef build::path path_type;
// Set of buildfiles already loaded for this scope. The included
// buildfiles are checked against the project's root scope while
// imported -- against the global scope (global_scope).
//
std::unordered_set<path_type> buildfiles;
// Target types.
//
public:
target_type_map target_types;
const target_type*
find_target_type (const char*, const scope** = nullptr) const;
// Given a name, figure out its type, taking into account extensions,
// special names (e.g., '.' and '..'), or anything else that might be
// relevant. Also process the name (in place) by extracting the
// extension, adjusting dir/value, etc., (note that the dir is not
// necessarily normalized). Return NULL if not found.
//
const target_type*
find_target_type (name&, const std::string*& ext) const;
// Rules.
//
public:
rule_map rules;
// Modules.
//
public:
loaded_module_map modules; // Only on root scope.
private:
friend class scope_map;
friend class temp_scope;
scope () = default;
const dir_path* path_; // Pointer to the key in scope_map.
scope* parent_;
scope* root_;
};
// Temporary scope. The idea is to be able to create a temporary
// scope in order not to change the variables in the current scope.
// Such a scope is not entered in to the scope map. As a result it
// can only be used as a temporary set of variables. In particular,
// defining targets/prerequisites directly in such a scope will surely
// end up badly. Defining any nested scopes will be as if defining
// such a scope in the parent (since path() returns parent's path).
//
class temp_scope: public scope
{
public:
temp_scope (scope& p) {path_ = p.path_; parent_ = &p; root_ = p.root_;}
};
using scope_map_base = butl::dir_path_map<scope>;
class scope_map: public scope_map_base
{
public:
// Note that we assume the first insertion into the map is that
// of the global scope.
//
std::pair<scope&, bool>
insert (const dir_path&, bool root);
scope&
operator[] (const dir_path& p) {return insert (p, false).first;}
// Find the most qualified scope that encompasses this path.
//
scope&
find (const dir_path&);
scope&
find (const path& p)
{
// Natural thing to do here would be to call find (p.directory ()).
// However, there could be a situation where the passed path is a
// directory (i.e., the calling code does not know what it is dealing
// with), so let's use the whole path.
//
return find (dir_path (p.string ()));
}
};
extern scope_map scopes;
extern scope* global_scope;
}
#endif // BUILD_SCOPE
|
