Mercurial > jwe > qt-gui-with-push-parser

comparison gui-main.cpp @ 5:54edd85237ab

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use signal to send input to qt interpreter object
author John W. Eaton <jwe@octave.org>
date Wed, 22 May 2019 18:07:37 -0400
parents 0e154787183d
children 04867eba6428
comparison
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4:0e154787183d 5:54edd85237ab
21 #include <readline/readline.h> 21 #include <readline/readline.h>
22 #include <readline/history.h> 22 #include <readline/history.h>
23 23
24 namespace gui 24 namespace gui
25 { 25 {
26 int available_char = 0; 26 static int available_char = 0;
27 27
28 command_window *calc_interaction_window = 0; 28 static command_window *calc_interaction_window = 0;
29 29
30 static inline int ctrl (int c) 30 static inline int ctrl (int c)
31 { 31 {
32 return c & 0x1f; 32 return c & 0x1f;
33 }
34
35 static int getc (FILE *)
36 {
37 int tmp = available_char;
38 available_char = 0;
39 return tmp;
40 }
41
42 static void redisplay (void)
43 {
44 if (calc_interaction_window)
45 calc_interaction_window->redisplay ();
46 }
47
48 static void prep_term (int)
49 {
50 }
51
52 static void deprep_term (void)
53 {
54 }
55
56 static void accept_line (char *line)
57 {
58 if (calc_interaction_window)
59 calc_interaction_window->accept_line (line ? line : "");
60 }
61
62 static void display_completion_matches (char **matches, int num_matches,
63 int /* max_length */)
64 {
65 if (calc_interaction_window)
66 {
67 std::ostringstream buf;
68
69 if (num_matches > 1)
70 buf << "\n";
71
72 for (int i = 1; i < num_matches; i++)
73 buf << matches[i] << "\n";
74
75 calc_interaction_window->insert_at_end (buf.str ());
76
77 calc_interaction_window->redisplay ();
78 }
79 }
80
81 static void readline_init (void)
82 {
83 rl_initialize ();
84
85 rl_getc_function = getc;
86 rl_redisplay_function = redisplay;
87 rl_prep_term_function = prep_term;
88 rl_deprep_term_function = deprep_term;
89 rl_completion_display_matches_hook = display_completion_matches;
90
91 rl_callback_handler_install (">> ", accept_line);
92 }
93
94 static void readline_fini (void)
95 {
96 rl_callback_handler_remove ();
33 } 97 }
34 98
35 command_window::command_window (QWidget *p) 99 command_window::command_window (QWidget *p)
36 : QTextEdit (p), 100 : QTextEdit (p),
37 m_buffer (new QTextDocument ()), 101 m_buffer (new QTextDocument ()),
47 connect (this, SIGNAL (result_available (double)), 111 connect (this, SIGNAL (result_available (double)),
48 this, SLOT (handle_result (double))); 112 this, SLOT (handle_result (double)));
49 113
50 connect (this, SIGNAL (input_char_available (int)), 114 connect (this, SIGNAL (input_char_available (int)),
51 this, SLOT (handle_input_char (int))); 115 this, SLOT (handle_input_char (int)));
116
117 connect (this, SIGNAL (accept_line_signal (const QString&)),
118 m_interpreter, SLOT (accept_input_line (const QString&)));
52 119
53 insert_at_end 120 insert_at_end
54 ("Qt Example Calculator.\n" 121 ("Qt Example Calculator.\n"
55 "Available operations: + - * / ^ ()\n" 122 "Available operations: + - * / ^ ()\n"
56 "Semicolon terminates statement.\n" 123 "Semicolon terminates statement.\n"
64 QTimer::singleShot (0, m_interpreter, SLOT (execute (void))); 131 QTimer::singleShot (0, m_interpreter, SLOT (execute (void)));
65 } 132 }
66 133
67 // Accept an input line, parse and possibly execute it. 134 // Accept an input line, parse and possibly execute it.
68 135
69 void command_window::accept (const std::string& line) 136 void command_window::accept_line (const std::string& line)
70 { 137 {
71 if (calc::debug_mode) 138 if (calc::debug_mode)
72 std::cerr << "accept: " << line << std::endl; 139 std::cerr << "accept: " << line << std::endl;
73 140
74 insert_at_end ("\n"); 141 insert_at_end ("\n");
76 if (! line.empty ()) 143 if (! line.empty ())
77 { 144 {
78 add_history (line.c_str ()); 145 add_history (line.c_str ());
79 using_history (); 146 using_history ();
80 147
81 // FIXME: what is the right thing to do with status returned 148 emit accept_line_signal (QString::fromStdString (line));
82 // by parser.
83 interpreter::parse_and_execute (line);
84 } 149 }
85 } 150 }
86 151
87 // Redisplay current command line. 152 // Redisplay current command line.
88 153
316 381
317 calc_interaction_window = new command_window (); 382 calc_interaction_window = new command_window ();
318 383
319 calc_interaction_window->show (); 384 calc_interaction_window->show ();
320 385
386 readline_init ();
387
321 int status = app.exec (); 388 int status = app.exec ();
389
390 readline_fini ();
322 391
323 return status; 392 return status;
324 } 393 }
325 394
326 void emit_error (const std::string& msg) 395 void emit_error (const std::string& msg)