Display.cpp

   1 /* Cycript - Optimizing JavaScript Compiler/Runtime
   2  * Copyright (C) 2009-2012  Jay Freeman (saurik)
   3 */
   4
   5 /* GNU Lesser General Public License, Version 3 {{{ */
   6 /*
   7  * Cycript is free software: you can redistribute it and/or modify it under
   8  * the terms of the GNU Lesser General Public License as published by the
   9  * Free Software Foundation, either version 3 of the License, or (at your
  10  * option) any later version.
  11  *
  12  * Cycript is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  15  * License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public License
  18  * along with Cycript.  If not, see <http://www.gnu.org/licenses/>.
  19 **/
  20 /* }}} */
  21
  22 #include <complex>
  23 #include <sstream>
  24
  25 #ifdef HAVE_READLINE_H
  26 #include <readline.h>
  27 #else
  28 #include <readline/readline.h>
  29 #endif
  30
  31 #include <sys/ioctl.h>
  32
  33 #include "Highlight.hpp"
  34
  35 #include <term.h>
  36
  37 typedef std::complex<int> CYCursor;
  38
  39 CYCursor current_;
  40 int width_;
  41 size_t point_;
  42
  43 unsigned CYDisplayWidth() {
  44     struct winsize info;
  45     if (ioctl(1, TIOCGWINSZ, &info) != -1)
  46         return info.ws_col;
  47     return tgetnum(const_cast<char *>("co"));
  48 }
  49
  50 void CYDisplayOutput_(int (*put)(int), const char *&data) {
  51     for (;; ++data) {
  52         char next(*data);
  53         if (next == '\0' || next == CYIgnoreEnd)
  54             return;
  55         if (put != NULL)
  56             put(next);
  57     }
  58 }
  59
  60 CYCursor CYDisplayOutput(int (*put)(int), int width, const char *data, ssize_t offset = 0) {
  61     CYCursor point(current_);
  62
  63     for (;;) {
  64         if (offset-- == 0)
  65             point = current_;
  66
  67         char next(*data++);
  68         switch (next) {
  69             case '\0':
  70                 return point;
  71             break;
  72
  73             case CYIgnoreStart:
  74                 CYDisplayOutput_(put, data);
  75                 ++offset;
  76             break;
  77
  78             case CYIgnoreEnd:
  79                 ++offset;
  80             break;
  81
  82             default:
  83                 if (put != NULL)
  84                     put(next);
  85
  86                 current_ += CYCursor(0, 1);
  87                 if (current_.imag() == width)
  88                     current_ = CYCursor(current_.real() + 1, 0);
  89             break;
  90         }
  91     }
  92
  93     return point;
  94 }
  95
  96 void CYDisplayMove(CYCursor target) {
  97     int offset(target.real() - current_.real());
  98
  99     if (offset < 0)
 100         putp(tparm(parm_up_cursor, -offset));
 101     else if (offset > 0)
 102         putp(tparm(parm_down_cursor, offset));
 103
 104     putp(tparm(column_address, target.imag()));
 105     current_ = target;
 106 }
 107
 108 void CYDisplayStart(int meta) {
 109     rl_prep_terminal(meta);
 110     current_ = CYCursor();
 111 }
 112
 113 void CYDisplayUpdate() {
 114 #if RL_READLINE_VERSION >= 0x0600
 115     const char *prompt(rl_display_prompt);
 116 #else
 117     const char *prompt(rl_prompt);
 118 #endif
 119
 120     std::ostringstream stream;
 121     CYLexerHighlight(rl_line_buffer, rl_end, stream, true);
 122     std::string string(stream.str());
 123     const char *buffer(string.c_str());
 124
 125     int width(CYDisplayWidth());
 126     if (width_ != width) {
 127         current_ = CYCursor();
 128         CYDisplayOutput(NULL, width, prompt);
 129         CYDisplayOutput(NULL, width, buffer, point_);
 130     }
 131
 132     CYDisplayMove(CYCursor());
 133     CYDisplayOutput(putchar, width, prompt);
 134
 135     CYCursor target(CYDisplayOutput(putchar, width, stream.str().c_str(), rl_point));
 136     if (target.imag() == 0)
 137         putp(cursor_down);
 138
 139     putp(clr_eos);
 140     CYDisplayMove(target);
 141
 142     fflush(stdout);
 143
 144     width_ = width;
 145     point_ = rl_point;
 146 }
 147
 148 void CYDisplayFinish() {
 149     rl_deprep_terminal();
 150 }