12 void bind(std::string type, std::string name, Parameters_Obj ps, Arguments_Obj as, Context* ctx, Env* env, Eval* eval)
14 std::string callee(type + " " + name);
16 std::map<std::string, Parameter_Obj> param_map;
18 for (size_t i = 0, L = as->length(); i < L; ++i) {
19 if (auto str = Cast<String_Quoted>((*as)[i]->value())) {
20 // force optional quotes (only if needed)
21 if (str->quote_mark()) {
27 // Set up a map to ensure named arguments refer to actual parameters. Also
28 // eval each default value left-to-right, wrt env, populating env as we go.
29 for (size_t i = 0, L = ps->length(); i < L; ++i) {
30 Parameter_Obj p = ps->at(i);
31 param_map[p->name()] = p;
32 // if (p->default_value()) {
33 // env->local_frame()[p->name()] = p->default_value()->perform(eval->with(env));
37 // plug in all args; if we have leftover params, deal with it later
38 size_t ip = 0, LP = ps->length();
39 size_t ia = 0, LA = as->length();
41 Argument_Obj a = as->at(ia);
43 // skip empty rest arguments
44 if (a->is_rest_argument()) {
45 if (List_Obj l = Cast<List>(a->value())) {
46 if (l->length() == 0) {
51 std::stringstream msg;
52 msg << "wrong number of arguments (" << LA << " for " << LP << ")";
53 msg << " for `" << name << "'";
54 return error(msg.str(), as->pstate());
56 Parameter_Obj p = ps->at(ip);
58 // If the current parameter is the rest parameter, process and break the loop
59 if (p->is_rest_parameter()) {
60 // The next argument by coincidence provides a rest argument
61 if (a->is_rest_argument()) {
63 // We should always get a list for rest arguments
64 if (List_Obj rest = Cast<List>(a->value())) {
65 // create a new list object for wrapped items
66 List_Ptr arglist = SASS_MEMORY_NEW(List,
71 // wrap each item from list as an argument
72 for (Expression_Obj item : rest->elements()) {
73 if (Argument_Obj arg = Cast<Argument>(item)) {
74 arglist->append(SASS_MEMORY_COPY(arg)); // copy
76 arglist->append(SASS_MEMORY_NEW(Argument,
84 // assign new arglist to environment
85 env->local_frame()[p->name()] = arglist;
89 throw std::runtime_error("invalid state");
91 } else if (a->is_keyword_argument()) {
93 // expand keyword arguments into their parameters
94 List_Ptr arglist = SASS_MEMORY_NEW(List, p->pstate(), 0, SASS_COMMA, true);
95 env->local_frame()[p->name()] = arglist;
96 Map_Obj argmap = Cast<Map>(a->value());
97 for (auto key : argmap->keys()) {
98 std::string name = unquote(Cast<String_Constant>(key)->value());
99 arglist->append(SASS_MEMORY_NEW(Argument,
109 // create a new list object for wrapped items
110 List_Obj arglist = SASS_MEMORY_NEW(List,
115 // consume the next args
119 // maybe we have another list as argument
120 List_Obj ls = Cast<List>(a->value());
121 // skip any list completely if empty
122 if (ls && ls->empty() && a->is_rest_argument()) continue;
124 Expression_Obj value = a->value();
125 if (Argument_Obj arg = Cast<Argument>(value)) {
126 arglist->append(arg);
128 // check if we have rest argument
129 else if (a->is_rest_argument()) {
130 // preserve the list separator from rest args
131 if (List_Obj rest = Cast<List>(a->value())) {
132 arglist->separator(rest->separator());
134 for (size_t i = 0, L = rest->size(); i < L; ++i) {
135 Expression_Obj obj = rest->at(i);
136 arglist->append(SASS_MEMORY_NEW(Argument,
147 // wrap all other value types into Argument
149 arglist->append(SASS_MEMORY_NEW(Argument,
157 // assign new arglist to environment
158 env->local_frame()[p->name()] = arglist;
160 // consumed parameter
162 // no more paramaters
166 // If the current argument is the rest argument, extract a value for processing
167 else if (a->is_rest_argument()) {
168 // normal param and rest arg
169 List_Obj arglist = Cast<List>(a->value());
170 // empty rest arg - treat all args as default values
171 if (!arglist->length()) {
174 if (arglist->length() > LP - ip && !ps->has_rest_parameter()) {
175 size_t arg_count = (arglist->length() + LA - 1);
176 std::stringstream msg;
177 msg << callee << " takes " << LP;
178 msg << (LP == 1 ? " argument" : " arguments");
179 msg << " but " << arg_count;
180 msg << (arg_count == 1 ? " was passed" : " were passed.");
181 deprecated_bind(msg.str(), as->pstate());
183 while (arglist->length() > LP - ip) {
184 arglist->elements().erase(arglist->elements().end() - 1);
188 // otherwise move one of the rest args into the param, converting to argument if necessary
189 Expression_Obj obj = arglist->at(0);
190 if (!(a = Cast<Argument>(obj))) {
191 Expression_Ptr a_to_convert = obj;
192 a = SASS_MEMORY_NEW(Argument,
193 a_to_convert->pstate(),
199 arglist->elements().erase(arglist->elements().begin());
200 if (!arglist->length() || (!arglist->is_arglist() && ip + 1 == LP)) {
204 } else if (a->is_keyword_argument()) {
205 Map_Obj argmap = Cast<Map>(a->value());
207 for (auto key : argmap->keys()) {
208 std::string name = "$" + unquote(Cast<String_Constant>(key)->value());
210 if (!param_map.count(name)) {
211 std::stringstream msg;
212 msg << callee << " has no parameter named " << name;
213 error(msg.str(), a->pstate());
215 env->local_frame()[name] = argmap->at(key);
223 if (a->name().empty()) {
224 if (env->has_local(p->name())) {
225 std::stringstream msg;
226 msg << "parameter " << p->name()
227 << " provided more than once in call to " << callee;
228 error(msg.str(), a->pstate());
230 // ordinal arg -- bind it to the next param
231 env->local_frame()[p->name()] = a->value();
235 // named arg -- bind it to the appropriately named param
236 if (!param_map.count(a->name())) {
237 std::stringstream msg;
238 msg << callee << " has no parameter named " << a->name();
239 error(msg.str(), a->pstate());
241 if (param_map[a->name()]->is_rest_parameter()) {
242 std::stringstream msg;
243 msg << "argument " << a->name() << " of " << callee
244 << "cannot be used as named argument";
245 error(msg.str(), a->pstate());
247 if (env->has_local(a->name())) {
248 std::stringstream msg;
249 msg << "parameter " << p->name()
250 << "provided more than once in call to " << callee;
251 error(msg.str(), a->pstate());
253 env->local_frame()[a->name()] = a->value();
258 // If we make it here, we're out of args but may have leftover params.
259 // That's only okay if they have default values, or were already bound by
260 // named arguments, or if it's a single rest-param.
261 for (size_t i = ip; i < LP; ++i) {
262 Parameter_Obj leftover = ps->at(i);
263 // cerr << "env for default params:" << endl;
265 // cerr << "********" << endl;
266 if (!env->has_local(leftover->name())) {
267 if (leftover->is_rest_parameter()) {
268 env->local_frame()[leftover->name()] = SASS_MEMORY_NEW(List,
274 else if (leftover->default_value()) {
275 Expression_Ptr dv = leftover->default_value()->perform(eval);
276 env->local_frame()[leftover->name()] = dv;
279 // param is unbound and has no default value -- error
280 throw Exception::MissingArgument(as->pstate(), name, leftover->name(), type);