1 | #include "sass.hpp" |
2 | #include "ast.hpp" |
3 | #include "environment.hpp" |
4 | |
5 | namespace Sass { |
6 | |
7 | template <typename T> |
8 | Environment<T>::Environment(bool is_shadow) |
9 | : local_frame_(environment_map<sass::string, T>()), |
10 | parent_(0), is_shadow_(false) |
11 | { } |
12 | template <typename T> |
13 | Environment<T>::Environment(Environment<T>* env, bool is_shadow) |
14 | : local_frame_(environment_map<sass::string, T>()), |
15 | parent_(env), is_shadow_(is_shadow) |
16 | { } |
17 | template <typename T> |
18 | Environment<T>::Environment(Environment<T>& env, bool is_shadow) |
19 | : local_frame_(environment_map<sass::string, T>()), |
20 | parent_(&env), is_shadow_(is_shadow) |
21 | { } |
22 | |
23 | // link parent to create a stack |
24 | template <typename T> |
25 | void Environment<T>::link(Environment& env) { parent_ = &env; } |
26 | template <typename T> |
27 | void Environment<T>::link(Environment* env) { parent_ = env; } |
28 | |
29 | // this is used to find the global frame |
30 | // which is the second last on the stack |
31 | template <typename T> |
32 | bool Environment<T>::is_lexical() const |
33 | { |
34 | return !! parent_ && parent_->parent_; |
35 | } |
36 | |
37 | // only match the real root scope |
38 | // there is still a parent around |
39 | // not sure what it is actually use for |
40 | // I guess we store functions etc. there |
41 | template <typename T> |
42 | bool Environment<T>::is_global() const |
43 | { |
44 | return parent_ && ! parent_->parent_; |
45 | } |
46 | |
47 | template <typename T> |
48 | environment_map<sass::string, T>& Environment<T>::local_frame() { |
49 | return local_frame_; |
50 | } |
51 | |
52 | template <typename T> |
53 | bool Environment<T>::has_local(const sass::string& key) const |
54 | { return local_frame_.find(key) != local_frame_.end(); } |
55 | |
56 | template <typename T> EnvResult |
57 | Environment<T>::find_local(const sass::string& key) |
58 | { |
59 | auto end = local_frame_.end(); |
60 | auto it = local_frame_.find(key); |
61 | return EnvResult(it, it != end); |
62 | } |
63 | |
64 | template <typename T> |
65 | T& Environment<T>::get_local(const sass::string& key) |
66 | { return local_frame_[key]; } |
67 | |
68 | template <typename T> |
69 | void Environment<T>::set_local(const sass::string& key, const T& val) |
70 | { |
71 | local_frame_[key] = val; |
72 | } |
73 | template <typename T> |
74 | void Environment<T>::set_local(const sass::string& key, T&& val) |
75 | { |
76 | local_frame_[key] = val; |
77 | } |
78 | |
79 | template <typename T> |
80 | void Environment<T>::del_local(const sass::string& key) |
81 | { local_frame_.erase(key); } |
82 | |
83 | template <typename T> |
84 | Environment<T>* Environment<T>::global_env() |
85 | { |
86 | Environment* cur = this; |
87 | while (cur->is_lexical()) { |
88 | cur = cur->parent_; |
89 | } |
90 | return cur; |
91 | } |
92 | |
93 | template <typename T> |
94 | bool Environment<T>::has_global(const sass::string& key) |
95 | { return global_env()->has(key); } |
96 | |
97 | template <typename T> |
98 | T& Environment<T>::get_global(const sass::string& key) |
99 | { return (*global_env())[key]; } |
100 | |
101 | template <typename T> |
102 | void Environment<T>::set_global(const sass::string& key, const T& val) |
103 | { |
104 | global_env()->local_frame_[key] = val; |
105 | } |
106 | template <typename T> |
107 | void Environment<T>::set_global(const sass::string& key, T&& val) |
108 | { |
109 | global_env()->local_frame_[key] = val; |
110 | } |
111 | |
112 | template <typename T> |
113 | void Environment<T>::del_global(const sass::string& key) |
114 | { global_env()->local_frame_.erase(key); } |
115 | |
116 | template <typename T> |
117 | Environment<T>* Environment<T>::lexical_env(const sass::string& key) |
118 | { |
119 | Environment* cur = this; |
120 | while (cur) { |
121 | if (cur->has_local(key)) { |
122 | return cur; |
123 | } |
124 | cur = cur->parent_; |
125 | } |
126 | return this; |
127 | } |
128 | |
129 | // see if we have a lexical variable |
130 | // move down the stack but stop before we |
131 | // reach the global frame (is not included) |
132 | template <typename T> |
133 | bool Environment<T>::has_lexical(const sass::string& key) const |
134 | { |
135 | auto cur = this; |
136 | while (cur->is_lexical()) { |
137 | if (cur->has_local(key)) return true; |
138 | cur = cur->parent_; |
139 | } |
140 | return false; |
141 | } |
142 | |
143 | // see if we have a lexical we could update |
144 | // either update already existing lexical value |
145 | // or if flag is set, we create one if no lexical found |
146 | template <typename T> |
147 | void Environment<T>::set_lexical(const sass::string& key, const T& val) |
148 | { |
149 | Environment<T>* cur = this; |
150 | bool shadow = false; |
151 | while ((cur && cur->is_lexical()) || shadow) { |
152 | EnvResult rv(cur->find_local(key)); |
153 | if (rv.found) { |
154 | rv.it->second = val; |
155 | return; |
156 | } |
157 | shadow = cur->is_shadow(); |
158 | cur = cur->parent_; |
159 | } |
160 | set_local(key, val); |
161 | } |
162 | // this one moves the value |
163 | template <typename T> |
164 | void Environment<T>::set_lexical(const sass::string& key, T&& val) |
165 | { |
166 | Environment<T>* cur = this; |
167 | bool shadow = false; |
168 | while ((cur && cur->is_lexical()) || shadow) { |
169 | EnvResult rv(cur->find_local(key)); |
170 | if (rv.found) { |
171 | rv.it->second = val; |
172 | return; |
173 | } |
174 | shadow = cur->is_shadow(); |
175 | cur = cur->parent_; |
176 | } |
177 | set_local(key, val); |
178 | } |
179 | |
180 | // look on the full stack for key |
181 | // include all scopes available |
182 | template <typename T> |
183 | bool Environment<T>::has(const sass::string& key) const |
184 | { |
185 | auto cur = this; |
186 | while (cur) { |
187 | if (cur->has_local(key)) { |
188 | return true; |
189 | } |
190 | cur = cur->parent_; |
191 | } |
192 | return false; |
193 | } |
194 | |
195 | // look on the full stack for key |
196 | // include all scopes available |
197 | template <typename T> EnvResult |
198 | Environment<T>::find(const sass::string& key) |
199 | { |
200 | auto cur = this; |
201 | while (true) { |
202 | EnvResult rv(cur->find_local(key)); |
203 | if (rv.found) return rv; |
204 | cur = cur->parent_; |
205 | if (!cur) return rv; |
206 | } |
207 | }; |
208 | |
209 | // use array access for getter and setter functions |
210 | template <typename T> |
211 | T& Environment<T>::get(const sass::string& key) |
212 | { |
213 | auto cur = this; |
214 | while (cur) { |
215 | if (cur->has_local(key)) { |
216 | return cur->get_local(key); |
217 | } |
218 | cur = cur->parent_; |
219 | } |
220 | return get_local(key); |
221 | } |
222 | |
223 | // use array access for getter and setter functions |
224 | template <typename T> |
225 | T& Environment<T>::operator[](const sass::string& key) |
226 | { |
227 | auto cur = this; |
228 | while (cur) { |
229 | if (cur->has_local(key)) { |
230 | return cur->get_local(key); |
231 | } |
232 | cur = cur->parent_; |
233 | } |
234 | return get_local(key); |
235 | } |
236 | /* |
237 | #ifdef DEBUG |
238 | template <typename T> |
239 | size_t Environment<T>::print(sass::string prefix) |
240 | { |
241 | size_t indent = 0; |
242 | if (parent_) indent = parent_->print(prefix) + 1; |
243 | std::cerr << prefix << sass::string(indent, ' ') << "== " << this << std::endl; |
244 | for (typename environment_map<sass::string, T>::iterator i = local_frame_.begin(); i != local_frame_.end(); ++i) { |
245 | if (!ends_with(i->first, "[f]") && !ends_with(i->first, "[f]4") && !ends_with(i->first, "[f]2")) { |
246 | std::cerr << prefix << sass::string(indent, ' ') << i->first << " " << i->second; |
247 | if (Value* val = Cast<Value>(i->second)) |
248 | { std::cerr << " : " << val->to_string(); } |
249 | std::cerr << std::endl; |
250 | } |
251 | } |
252 | return indent ; |
253 | } |
254 | #endif |
255 | */ |
256 | // compile implementation for AST_Node |
257 | template class Environment<AST_Node_Obj>; |
258 | |
259 | } |
260 | |
261 | |