aboutsummaryrefslogtreecommitdiff
path: root/build2/config/utility.cxx
blob: b73e85263a8b01fb683db9be3e975c09b0f7b5d5 (plain)
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
// file      : build2/config/utility.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
// license   : MIT; see accompanying LICENSE file

#include <build2/config/utility>

#include <build2/context>

#include <build2/config/module>

using namespace std;

namespace build2
{
  namespace config
  {
    pair<const value*, bool>
    required (scope& r, const variable& var)
    {
      // This is a stripped-down version of the other required() twisted
      // implementation.

      pair<lookup, size_t> org (r.find_original (var));

      bool n (false); // New flag.
      lookup l (org.first);

      // Treat an inherited value that was set to default as new.
      //
      if (l.defined () && l->extra)
        n = true;

      if (var.override != nullptr)
      {
        pair<lookup, size_t> ovr (r.find_override (var, move (org)));

        if (l != ovr.first) // Overriden?
        {
          // Override is always treated as new.
          //
          n = true;
          l = move (ovr.first);
        }
      }

      if (l.defined () && current_mif->id == configure_id)
          save_variable (r, var);

      return pair<const value*, bool> (l.value, n);
    }

    const value&
    optional (scope& r, const variable& var)
    {
      if (current_mif->id == configure_id)
        save_variable (r, var);

      auto l (r[var]);
      return l.defined ()
        ? *l
        : r.assign (var); // NULL.
    }

    bool
    specified (scope& r, const string& ns)
    {
      // Search all outer scopes for any value in this namespace.
      //
      // What about "pure" overrides, i.e., those without any original values?
      // Well, they will also be found since their names have the original
      // variable as a prefix. But do they apply? Yes, since we haven't found
      // any original values, they will be "visible"; see find_override() for
      // details.
      //
      for (scope* s (&r); s != nullptr; s = s->parent_scope ())
      {
        for (auto p (s->vars.find_namespace (ns));
             p.first != p.second;
             ++p.first)
        {
          const variable& var (p.first->first);

          // Ignore config.*.configured.
          //
          if (var.name.size () < 11 ||
              var.name.compare (var.name.size () - 11, 11, ".configured") != 0)
            return true;
        }
      }

      return false;
    }

    bool
    unconfigured (scope& root, const string& ns)
    {
      // Note: not overridable.
      //
      const variable& var (var_pool.insert<bool> (ns + ".configured"));

      if (current_mif->id == configure_id)
        save_variable (root, var);

      auto l (root[var]); // Include inherited values.
      return l && !cast<bool> (l);
    }

    void
    unconfigured (scope& root, const string& ns, bool v)
    {
      // Note: not overridable.
      //
      const variable& var (var_pool.insert<bool> (ns + ".configured"));

      if (current_mif->id == configure_id)
        save_variable (root, var);

      root.assign (var) = !v;
    }

    void
    save_variable (scope& r, const variable& var, uint64_t flags)
    {
      if (current_mif->id != configure_id)
        return;

      // The project might not be using the config module. But then how
      // could we be configuring it? Good question.
      //
      if (module* m = r.modules.lookup<module> (module::name))
      {
        const string& n (var.name);

        // First try to find the module with the name that is the longest
        // prefix of this variable name.
        //
        saved_modules& sm (m->saved_modules);
        auto i (sm.end ());

        if (!sm.empty ())
        {
          i = sm.upper_bound (n);

          // Get the greatest less than, if any. We might still not be a
          // suffix. And we still have to check the last element if
          // upper_bound() returned end().
          //
          if (i == sm.begin () || !sm.key_comp ().prefix ((--i)->first, n))
            i = sm.end ();
        }

        // If no module matched, then create one based on the variable name.
        //
        if (i == sm.end ())
        {
          // @@ For now with 'config.' prefix.
          //
          i = sm.insert (string (n, 0, n.find ('.', 7)));
        }

        // Don't insert duplicates. The config.import vars are particularly
        // susceptible to duplication.
        //
        saved_variables& sv (i->second);
        auto j (sv.find (var));

        if (j == sv.end ())
          sv.push_back (saved_variable {var, flags});
        else
          assert (j->flags == flags);
      }
    }
  }
}