Highlight.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 "Code.hpp"
  23 #include "Driver.hpp"
  24 #include "Highlight.hpp"
  25
  26 bool CYLexerHighlight(hi::Value &highlight, CYLocation &location, void *scanner);
  27
  28 static void Skip(const char *data, size_t size, std::ostream &output, size_t &offset, CYPosition &current, CYPosition target) {
  29     while (current.line != target.line || current.column != target.column) {
  30         _assert(offset != size);
  31         char next(data[offset++]);
  32
  33         output.put(next);
  34
  35         _assert(current.line < target.line || current.line == target.line && current.column < target.column);
  36         if (next == '\n')
  37             current.Lines();
  38         else
  39             current.Columns();
  40     }
  41 }
  42
  43 struct CYColor {
  44     bool bold_;
  45     unsigned code_;
  46
  47     CYColor() {
  48     }
  49
  50     CYColor(bool bold, unsigned code) :
  51         bold_(bold),
  52         code_(code)
  53     {
  54     }
  55 };
  56
  57 _visible void CYLexerHighlight(const char *data, size_t size, std::ostream &output, bool ignore) {
  58     CYLocalPool pool;
  59
  60     CYStream stream(data, data + size);
  61     CYDriver driver(pool, stream);
  62     driver.highlight_ = true;
  63
  64     size_t offset(0);
  65     CYPosition current;
  66
  67     hi::Value highlight;
  68     CYLocation location;
  69
  70     while (CYLexerHighlight(highlight, location, driver.scanner_)) {
  71         CYColor color;
  72
  73         switch (highlight) {
  74             case hi::Comment: color = CYColor(true, 30); break;
  75             case hi::Constant: color = CYColor(false, 31); break;
  76             case hi::Control: color = CYColor(false, 33); break;
  77             case hi::Error: color = CYColor(true, 31); break;
  78             case hi::Identifier: color = CYColor(false, 0); break;
  79             case hi::Meta: color = CYColor(false, 32); break;
  80             case hi::Nothing: color = CYColor(false, 0); break;
  81             case hi::Operator: color = CYColor(false, 36); break;
  82             case hi::Special: color = CYColor(false, 35); break;
  83             case hi::Structure: color = CYColor(true, 34); break;
  84             case hi::Type: color = CYColor(true, 34); break;
  85
  86             // XXX: maybe I should use nodefault here?
  87             default: color = CYColor(true, 0); break;
  88         }
  89
  90         Skip(data, size, output, offset, current, location.begin);
  91
  92         if (color.code_ != 0) {
  93             if (ignore)
  94                 output << CYIgnoreStart;
  95             output << "\e[" << (color.bold_ ? '1' : '0') << ";" << color.code_ << "m";
  96             if (ignore)
  97                 output << CYIgnoreEnd;
  98         }
  99
 100         Skip(data, size, output, offset, current, location.end);
 101
 102         if (color.code_ != 0) {
 103             if (ignore)
 104                 output << CYIgnoreStart;
 105             output << "\e[0m";
 106             if (ignore)
 107                 output << CYIgnoreEnd;
 108         }
 109     }
 110
 111     output.write(data + offset, size - offset);
 112 }