1 //===-- Editline.h ----------------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 //TODO: wire up window size changes
12 // If we ever get a private copy of libedit, there are a number of defects that would be nice to fix;
13 // a) Sometimes text just disappears while editing. In an 80-column editor paste the following text, without
15 // "This is a test of the input system missing Hello, World! Do you disappear when it gets to a particular length?"
16 // Now press ^A to move to the start and type 3 characters, and you'll see a good amount of the text will
17 // disappear. It's still in the buffer, just invisible.
18 // b) The prompt printing logic for dealing with ANSI formatting characters is broken, which is why we're
19 // working around it here.
20 // c) When resizing the terminal window, if the cursor moves between rows libedit will get confused.
21 // d) The incremental search uses escape to cancel input, so it's confused by ANSI sequences starting with escape.
22 // e) Emoji support is fairly terrible, presumably it doesn't understand composed characters?
24 #ifndef liblldb_Editline_h_
25 #define liblldb_Editline_h_
26 #if defined(__cplusplus)
31 // components needed to handle wide characters ( <codecvt>, codecvt_utf8, libedit built with '--enable-widec' )
32 // are not consistenly available on non-OSX platforms. The wchar_t versions of libedit functions will only be
33 // used in cases where this is true. This is a compile time dependecy, for now selected per target Platform
34 #if defined (__APPLE__)
35 #define LLDB_EDITLINE_USE_WCHAR 1
38 #define LLDB_EDITLINE_USE_WCHAR 0
41 #include "lldb/lldb-private.h"
42 #include "lldb/Host/ConnectionFileDescriptor.h"
45 #include "lldb/Host/windows/editlinewin.h"
47 #if !defined(__ANDROID_NDK__)
55 #include "lldb/Host/Condition.h"
56 #include "lldb/Host/ConnectionFileDescriptor.h"
57 #include "lldb/Host/FileSpec.h"
58 #include "lldb/Host/Mutex.h"
59 #include "lldb/Host/Predicate.h"
61 namespace lldb_private {
62 namespace line_editor {
64 // type alias's to help manage 8 bit and wide character versions of libedit
65 #if LLDB_EDITLINE_USE_WCHAR
66 using EditLineStringType = std::wstring;
67 using EditLineStringStreamType = std::wstringstream;
68 using EditLineCharType = wchar_t;
70 using EditLineStringType=std::string;
71 using EditLineStringStreamType = std::stringstream;
72 using EditLineCharType = char;
75 typedef int (* EditlineGetCharCallbackType)(::EditLine * editline, EditLineCharType * c);
76 typedef unsigned char (* EditlineCommandCallbackType)(::EditLine * editline, int ch);
77 typedef const char * (* EditlinePromptCallbackType)(::EditLine * editline);
79 class EditlineHistory;
81 typedef std::shared_ptr<EditlineHistory> EditlineHistorySP;
83 typedef bool (* IsInputCompleteCallbackType) (
88 typedef int (* FixIndentationCallbackType) (
90 const StringList & lines,
94 typedef int (* CompleteCallbackType) (
95 const char * current_line,
97 const char * last_char,
98 int skip_first_n_matches,
100 StringList & matches,
103 /// Status used to decide when and how to start editing another line in multi-line sessions
104 enum class EditorStatus
107 /// The default state proceeds to edit the current line
110 /// Editing complete, returns the complete set of edited lines
113 /// End of input reported
116 /// Editing interrupted
120 /// Established locations that can be easily moved among with MoveCursor
121 enum class CursorLocation
123 /// The start of the first line in a multi-line edit session
126 /// The start of the current line in a multi-line edit session
129 /// The location of the cursor on the current line in a multi-line edit session
132 /// The location immediately after the last character in a multi-line edit session
137 using namespace line_editor;
139 /// Instances of Editline provide an abstraction over libedit's EditLine facility. Both
140 /// single- and multi-line editing are supported.
144 Editline (const char * editor_name, FILE * input_file, FILE * output_file, FILE * error_file, bool color_prompts);
148 /// Uses the user data storage of EditLine to retrieve an associated instance of Editline.
150 InstanceFor (::EditLine * editline);
152 /// Sets a string to be used as a prompt, or combined with a line number to form a prompt.
154 SetPrompt (const char * prompt);
156 /// Sets an alternate string to be used as a prompt for the second line and beyond in multi-line
157 /// editing scenarios.
159 SetContinuationPrompt (const char * continuation_prompt);
161 /// Required to update the width of the terminal registered for I/O. It is critical that this
162 /// be correct at all times.
164 TerminalSizeChanged();
166 /// Returns the prompt established by SetPrompt()
170 /// Returns the index of the line currently being edited
174 /// Interrupt the current edit as if ^C was pressed
178 /// Cancel this edit and oblitarate all trace of it
182 /// Register a callback for the tab key
184 SetAutoCompleteCallback (CompleteCallbackType callback, void * baton);
186 /// Register a callback for testing whether multi-line input is complete
188 SetIsInputCompleteCallback (IsInputCompleteCallbackType callback, void * baton);
190 /// Register a callback for determining the appropriate indentation for a line
191 /// when creating a newline. An optional set of insertable characters can also
192 /// trigger the callback.
194 SetFixIndentationCallback (FixIndentationCallbackType callback,
196 const char * indent_chars);
198 /// Prompts for and reads a single line of user input.
200 GetLine (std::string &line, bool &interrupted);
202 /// Prompts for and reads a multi-line batch of user input.
204 GetLines (int first_line_number, StringList &lines, bool &interrupted);
207 PrintAsync (Stream *stream, const char *s, size_t len);
211 /// Sets the lowest line number for multi-line editing sessions. A value of zero suppresses
212 /// line number printing in the prompt.
214 SetBaseLineNumber (int line_number);
216 /// Returns the complete prompt by combining the prompt or continuation prompt with line numbers
217 /// as appropriate. The line index is a zero-based index into the current multi-line session.
219 PromptForIndex (int line_index);
221 /// Sets the current line index between line edits to allow free movement between lines. Updates
222 /// the prompt to match.
224 SetCurrentLine (int line_index);
226 /// Determines the width of the prompt in characters. The width is guaranteed to be the same for
227 /// all lines of the current multi-line session.
231 /// Returns true if the underlying EditLine session's keybindings are Emacs-based, or false if
232 /// they are VI-based.
236 /// Returns true if the current EditLine buffer contains nothing but spaces, or is empty.
240 /// Helper method used by MoveCursor to determine relative line position.
242 GetLineIndexForLocation (CursorLocation location, int cursor_row);
244 /// Move the cursor from one well-established location to another using relative line positioning
245 /// and absolute column positioning.
247 MoveCursor (CursorLocation from, CursorLocation to);
249 /// Clear from cursor position to bottom of screen and print input lines including prompts, optionally
250 /// starting from a specific line. Lines are drawn with an extra space at the end to reserve room for
251 /// the rightmost cursor position.
253 DisplayInput (int firstIndex = 0);
255 /// Counts the number of rows a given line of content will end up occupying, taking into account both
256 /// the preceding prompt and a single trailing space occupied by a cursor when at the end of the line.
258 CountRowsForLine (const EditLineStringType & content);
260 /// Save the line currently being edited
264 /// Convert the current input lines into a UTF8 StringList
266 GetInputAsStringList(int line_count = UINT32_MAX);
268 /// Replaces the current multi-line session with the next entry from history. When the parameter is
269 /// true it will take the next earlier entry from history, when it is false it takes the next most
272 RecallHistory (bool earlier);
274 /// Character reading implementation for EditLine that supports our multi-line editing trickery.
276 GetCharacter (EditLineCharType * c);
278 /// Prompt implementation for EditLine.
282 /// Line break command used when return is pressed in multi-line mode.
284 BreakLineCommand (int ch);
286 /// Delete command used when delete is pressed in multi-line mode.
288 DeleteNextCharCommand (int ch);
290 /// Delete command used when backspace is pressed in multi-line mode.
292 DeletePreviousCharCommand (int ch);
294 /// Line navigation command used when ^P or up arrow are pressed in multi-line mode.
296 PreviousLineCommand (int ch);
298 /// Line navigation command used when ^N or down arrow are pressed in multi-line mode.
300 NextLineCommand (int ch);
302 /// Buffer start command used when Esc < is typed in multi-line emacs mode.
304 BufferStartCommand (int ch);
306 /// Buffer end command used when Esc > is typed in multi-line emacs mode.
308 BufferEndCommand (int ch);
310 /// Context-sensitive tab insertion or code completion command used when the tab key is typed.
314 /// Respond to normal character insertion by fixing line indentation
316 FixIndentationCommand (int ch);
318 /// Revert line command used when moving between lines.
320 RevertLineCommand (int ch);
322 /// Ensures that the current EditLine instance is properly configured for single or multi-line editing.
324 ConfigureEditor (bool multiline);
327 #if LLDB_EDITLINE_USE_WCHAR
328 std::wstring_convert<std::codecvt_utf8<wchar_t>> m_utf8conv;
330 ::EditLine * m_editline = nullptr;
331 EditlineHistorySP m_history_sp;
332 bool m_in_history = false;
333 std::vector<EditLineStringType> m_live_history_lines;
334 bool m_multiline_enabled = false;
335 std::vector<EditLineStringType> m_input_lines;
336 EditorStatus m_editor_status;
337 bool m_color_prompts = true;
338 int m_terminal_width = 0;
339 int m_base_line_number = 0;
340 unsigned m_current_line_index = 0;
341 int m_current_line_rows = -1;
342 int m_revert_cursor_index = 0;
343 int m_line_number_digits = 3;
344 std::string m_set_prompt;
345 std::string m_set_continuation_prompt;
346 std::string m_current_prompt;
347 bool m_needs_prompt_repaint = false;
348 std::string m_editor_name;
350 FILE * m_output_file;
352 ConnectionFileDescriptor m_input_connection;
353 IsInputCompleteCallbackType m_is_input_complete_callback = nullptr;
354 void * m_is_input_complete_callback_baton = nullptr;
355 FixIndentationCallbackType m_fix_indentation_callback = nullptr;
356 void * m_fix_indentation_callback_baton = nullptr;
357 const char * m_fix_indentation_callback_chars = nullptr;
358 CompleteCallbackType m_completion_callback = nullptr;
359 void * m_completion_callback_baton = nullptr;
361 Mutex m_output_mutex;
365 #endif // #if defined(__cplusplus)
366 #endif // liblldb_Editline_h_