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 const char *CYDisplayPrompt() {
  44 #if RL_READLINE_VERSION >= 0x0600
  45     return rl_display_prompt;
  46 #else
  47     return rl_prompt;
  48 #endif
  49 }
  50
  51 unsigned CYDisplayWidth() {
  52     struct winsize info;
  53     if (ioctl(1, TIOCGWINSZ, &info) != -1)
  54         return info.ws_col;
  55     return tgetnum(const_cast<char *>("co"));
  56 }
  57
  58 void CYDisplayOutput_(int (*put)(int), const char *&data) {
  59     for (;; ++data) {
  60         char next(*data);
  61         if (next == '\0' || next == CYIgnoreEnd)
  62             return;
  63         if (put != NULL)
  64             put(next);
  65     }
  66 }
  67
  68 CYCursor CYDisplayOutput(int (*put)(int), int width, const char *data, ssize_t offset = 0) {
  69     CYCursor point(current_);
  70
  71     for (;;) {
  72         if (offset-- == 0)
  73             point = current_;
  74
  75         char next(*data++);
  76         switch (next) {
  77             case '\0':
  78                 return point;
  79             break;
  80
  81             case CYIgnoreStart:
  82                 CYDisplayOutput_(put, data);
  83                 ++offset;
  84             break;
  85
  86             case CYIgnoreEnd:
  87                 ++offset;
  88             break;
  89
  90             default:
  91                 if (put != NULL)
  92                     put(next);
  93
  94                 current_ += CYCursor(0, 1);
  95                 if (current_.imag() == width)
  96                     current_ = CYCursor(current_.real() + 1, 0);
  97             break;
  98         }
  99     }
 100
 101     return point;
 102 }
 103
 104 void CYDisplayMove(CYCursor target) {
 105     int offset(target.real() - current_.real());
 106
 107     if (offset < 0)
 108         putp(tparm(parm_up_cursor, -offset));
 109     else if (offset > 0)
 110         putp(tparm(parm_down_cursor, offset));
 111
 112     putp(tparm(column_address, target.imag()));
 113     current_ = target;
 114 }
 115
 116 void CYDisplayStart(int meta) {
 117     rl_prep_terminal(meta);
 118     current_ = CYCursor();
 119 }
 120
 121 void CYDisplayUpdate() {
 122     std::ostringstream stream;
 123     CYLexerHighlight(rl_line_buffer, rl_end, stream, true);
 124     std::string string(stream.str());
 125     const char *buffer(string.c_str());
 126
 127     int width(CYDisplayWidth());
 128     if (width_ != width) {
 129         current_ = CYCursor();
 130         CYDisplayOutput(NULL, width, CYDisplayPrompt());
 131         CYDisplayOutput(NULL, width, buffer, point_);
 132     }
 133
 134     CYDisplayMove(CYCursor());
 135     CYDisplayOutput(putchar, width, CYDisplayPrompt());
 136
 137     CYCursor target(CYDisplayOutput(putchar, width, stream.str().c_str(), rl_point));
 138     if (target.imag() == 0)
 139         putp(cursor_down);
 140
 141     putp(clr_eos);
 142     CYDisplayMove(target);
 143
 144     fflush(stdout);
 145
 146     width_ = width;
 147     point_ = rl_point;
 148 }
 149
 150 void CYDisplayFinish() {
 151     rl_deprep_terminal();
 152 }