Complete.cpp

   1 /* Cycript - The Truly Universal Scripting Language
   2  * Copyright (C) 2009-2016  Jay Freeman (saurik)
   3 */
   4
   5 /* GNU Affero General Public License, Version 3 {{{ */
   6 /*
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 **/
  20 /* }}} */
  21
  22 #include "cycript.hpp"
  23
  24 #include "Driver.hpp"
  25 #include "Replace.hpp"
  26 #include "String.hpp"
  27
  28 static CYExpression *ParseExpression(CYPool &pool, CYUTF8String code) {
  29     std::stringstream stream;
  30     stream << '(' << code << ')';
  31     CYDriver driver(pool, *stream.rdbuf());
  32     if (driver.Parse() || !driver.errors_.empty())
  33         return NULL;
  34
  35     CYOptions options;
  36     CYContext context(options);
  37
  38     CYStatement *statement(driver.script_->code_);
  39     _assert(statement != NULL);
  40     _assert(statement->next_ == NULL);
  41
  42     CYExpress *express(dynamic_cast<CYExpress *>(driver.script_->code_));
  43     _assert(express != NULL);
  44
  45     CYParenthetical *parenthetical(dynamic_cast<CYParenthetical *>(express->expression_));
  46     _assert(parenthetical != NULL);
  47
  48     return parenthetical->expression_;
  49 }
  50
  51 _visible char **CYComplete(const char *word, const std::string &line, CYUTF8String (*run)(CYPool &pool, const std::string &)) {
  52     CYLocalPool pool;
  53
  54     std::stringbuf stream(line);
  55     CYDriver driver(pool, stream);
  56
  57     driver.auto_ = true;
  58
  59     if (driver.Parse() || !driver.errors_.empty())
  60         return NULL;
  61
  62     if (driver.mode_ == CYDriver::AutoNone)
  63         return NULL;
  64
  65     CYExpression *expression;
  66
  67     CYOptions options;
  68     CYContext context(options);
  69
  70     std::ostringstream prefix;
  71
  72     switch (driver.mode_) {
  73         case CYDriver::AutoPrimary:
  74             expression = $ CYThis();
  75         break;
  76
  77         case CYDriver::AutoDirect:
  78             expression = driver.context_;
  79         break;
  80
  81         case CYDriver::AutoIndirect:
  82             expression = $ CYIndirect(driver.context_);
  83         break;
  84
  85         case CYDriver::AutoMessage: {
  86             CYDriver::Context &thing(driver.contexts_.back());
  87             expression = $M($C1($V("object_getClass"), thing.context_), $S("messages"));
  88             for (CYDriver::Context::Words::const_iterator part(thing.words_.begin()); part != thing.words_.end(); ++part)
  89                 prefix << (*part)->word_ << ':';
  90         } break;
  91
  92         case CYDriver::AutoResolve:
  93             expression = $M(driver.context_, $S("$cyr"));
  94         break;
  95
  96         case CYDriver::AutoStruct:
  97             expression = $ CYThis();
  98             prefix << "$cys";
  99         break;
 100
 101         case CYDriver::AutoEnum:
 102             expression = $ CYThis();
 103             prefix << "$cye";
 104         break;
 105
 106         default:
 107             _assert(false);
 108     }
 109
 110     std::string begin(prefix.str());
 111
 112     driver.script_ = $ CYScript($ CYExpress($C3(ParseExpression(pool,
 113     "   function(object, prefix, word) {\n"
 114     "       var names = [];\n"
 115     "       var before = prefix.length;\n"
 116     "       prefix += word;\n"
 117     "       var entire = prefix.length;\n"
 118     "       if (false) {\n"
 119     "           for (var name in object)\n"
 120     "               if (name.substring(0, entire) == prefix)\n"
 121     "                   names.push(name);\n"
 122     "       } else do {\n"
 123     "           if (object.hasOwnProperty(\"cy$complete\")) {\n"
 124     "               names = names.concat(object.cy$complete(prefix));\n"
 125     "               continue;\n"
 126     "           }\n"
 127     "           try {\n"
 128     "               var local = Object.getOwnPropertyNames(object);\n"
 129     "           } catch (e) {\n"
 130     "               continue;\n"
 131     "           }\n"
 132     "           for (var name of local)\n"
 133     "               if (name.substring(0, entire) == prefix)\n"
 134     "                   names.push(name);\n"
 135     "       } while (object = typeof object === 'object' ? Object.getPrototypeOf(object) : object.__proto__);\n"
 136     "       return names;\n"
 137     "   }\n"
 138     ), expression, $S(begin.c_str()), $S(word))));
 139
 140     driver.script_->Replace(context);
 141
 142     std::stringbuf str;
 143     CYOutput out(str, options);
 144     out << *driver.script_;
 145
 146     std::string code(str.str());
 147     CYUTF8String json(run(pool, code));
 148     // XXX: if this fails we should not try to parse it
 149
 150     CYExpression *result(ParseExpression(pool, json));
 151     if (result == NULL)
 152         return NULL;
 153
 154     CYArray *array(dynamic_cast<CYArray *>(result->Primitive(context)));
 155     if (array == NULL)
 156         return NULL;
 157
 158     // XXX: use an std::set?
 159     typedef std::vector<CYUTF8String> Completions;
 160     Completions completions;
 161
 162     std::string common;
 163     bool rest(false);
 164
 165     for (CYElement *element(array->elements_); element != NULL; ) {
 166         CYElementValue *value(dynamic_cast<CYElementValue *>(element));
 167         _assert(value != NULL);
 168         element = value->next_;
 169
 170         CYString *string(dynamic_cast<CYString *>(value->value_));
 171         _assert(string != NULL);
 172
 173         CYUTF8String completion;
 174         if (string->size_ != 0)
 175             completion = {string->value_, string->size_};
 176         else if (driver.mode_ == CYDriver::AutoMessage)
 177             completion = "]";
 178         else
 179             continue;
 180
 181         completion.data += begin.size();
 182         completion.size -= begin.size();
 183
 184         if (CYStartsWith(completion, "$cy"))
 185             continue;
 186         completions.push_back(completion);
 187
 188         if (!rest) {
 189             common = completion;
 190             rest = true;
 191         } else {
 192             size_t limit(completion.size), size(common.size());
 193             if (size > limit)
 194                 common = common.substr(0, limit);
 195             else
 196                 limit = size;
 197             for (limit = 0; limit != size; ++limit)
 198                 if (common[limit] != completion.data[limit])
 199                     break;
 200             if (limit != size)
 201                 common = common.substr(0, limit);
 202         }
 203     }
 204
 205     size_t count(completions.size());
 206     if (count == 0)
 207         return NULL;
 208
 209     size_t colon(common.find(':'));
 210     if (colon != std::string::npos)
 211         common = common.substr(0, colon + 1);
 212     if (completions.size() == 1)
 213         common += ' ';
 214
 215     char **results(reinterpret_cast<char **>(malloc(sizeof(char *) * (count + 2))));
 216
 217     results[0] = strdup(common.c_str());
 218     size_t index(0);
 219     for (Completions::const_iterator i(completions.begin()); i != completions.end(); ++i)
 220         results[++index] = strdup(i->data);
 221     results[count + 1] = NULL;
 222
 223     return results;
 224 }