Complete.cpp

   1 /* Cycript - Optimizing JavaScript Compiler/Runtime
   2  * Copyright (C) 2009-2015  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);
  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::istringstream 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         default:
  93             _assert(false);
  94     }
  95
  96     std::string begin(prefix.str());
  97
  98     driver.script_ = $ CYScript($ CYExpress($C3(ParseExpression(pool,
  99     "   function(object, prefix, word) {\n"
 100     "       var names = [];\n"
 101     "       var before = prefix.length;\n"
 102     "       prefix += word;\n"
 103     "       var entire = prefix.length;\n"
 104     "       if (false) {\n"
 105     "           for (var name in object)\n"
 106     "               if (name.substring(0, entire) == prefix)\n"
 107     "                   names.push(name.substr(before));\n"
 108     "       } else do {\n"
 109     "           try {\n"
 110     "               var local = Object.getOwnPropertyNames(object);\n"
 111     "           } catch (e) {\n"
 112     "               continue;\n"
 113     "           }\n"
 114     "           for (var name of local)\n"
 115     "               if (name.substring(0, entire) == prefix)\n"
 116     "                   names.push(name.substr(before));\n"
 117     "       } while (object = typeof object === 'object' ? Object.getPrototypeOf(object) : object.__proto__);\n"
 118     "       return names;\n"
 119     "   }\n"
 120     ), expression, $S(begin.c_str()), $S(word))));
 121
 122     driver.script_->Replace(context);
 123
 124     std::stringbuf str;
 125     CYOutput out(str, options);
 126     out << *driver.script_;
 127
 128     std::string code(str.str());
 129     CYUTF8String json(run(pool, code));
 130     // XXX: if this fails we should not try to parse it
 131
 132     CYExpression *result(ParseExpression(pool, json));
 133     if (result == NULL)
 134         return NULL;
 135
 136     CYArray *array(dynamic_cast<CYArray *>(result->Primitive(context)));
 137     if (array == NULL)
 138         return NULL;
 139
 140     // XXX: use an std::set?
 141     typedef std::vector<std::string> Completions;
 142     Completions completions;
 143
 144     std::string common;
 145     bool rest(false);
 146
 147     for (CYElement *element(array->elements_); element != NULL; ) {
 148         CYElementValue *value(dynamic_cast<CYElementValue *>(element));
 149         _assert(value != NULL);
 150         element = value->next_;
 151
 152         CYString *string(dynamic_cast<CYString *>(value->value_));
 153         _assert(string != NULL);
 154
 155         std::string completion;
 156         if (string->size_ != 0)
 157             completion.assign(string->value_, string->size_);
 158         else if (driver.mode_ == CYDriver::AutoMessage)
 159             completion = "]";
 160         else
 161             continue;
 162
 163         completions.push_back(completion);
 164
 165         if (!rest) {
 166             common = completion;
 167             rest = true;
 168         } else {
 169             size_t limit(completion.size()), size(common.size());
 170             if (size > limit)
 171                 common = common.substr(0, limit);
 172             else
 173                 limit = size;
 174             for (limit = 0; limit != size; ++limit)
 175                 if (common[limit] != completion[limit])
 176                     break;
 177             if (limit != size)
 178                 common = common.substr(0, limit);
 179         }
 180     }
 181
 182     size_t count(completions.size());
 183     if (count == 0)
 184         return NULL;
 185
 186     size_t colon(common.find(':'));
 187     if (colon != std::string::npos)
 188         common = common.substr(0, colon + 1);
 189     if (completions.size() == 1)
 190         common += ' ';
 191
 192     char **results(reinterpret_cast<char **>(malloc(sizeof(char *) * (count + 2))));
 193
 194     results[0] = strdup(common.c_str());
 195     size_t index(0);
 196     for (Completions::const_iterator i(completions.begin()); i != completions.end(); ++i)
 197         results[++index] = strdup(i->c_str());
 198     results[count + 1] = NULL;
 199
 200     return results;
 201 }