1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
4 // met:
5 //
6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided
11 // with the distribution.
12 // * Neither the name of Google Inc. nor the names of its
13 // contributors may be used to endorse or promote products derived
14 // from this software without specific prior written permission.
15 //
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28
29 #include <cstdio> // NOLINT
30 #include <readline/readline.h> // NOLINT
31 #include <readline/history.h> // NOLINT
32
33 // The readline includes leaves RETURN defined which breaks V8 compilation.
34 #undef RETURN
35
36 #include "d8.h"
37
38
39 // There are incompatibilities between different versions and different
40 // implementations of readline. This smooths out one known incompatibility.
41 #if RL_READLINE_VERSION >= 0x0500
42 #define completion_matches rl_completion_matches
43 #endif
44
45
46 namespace v8 {
47
48
49 class ReadLineEditor: public LineEditor {
50 public:
ReadLineEditor()51 ReadLineEditor() : LineEditor(LineEditor::READLINE, "readline") { }
52 virtual Handle<String> Prompt(const char* prompt);
53 virtual bool Open();
54 virtual bool Close();
55 virtual void AddHistory(const char* str);
56
57 static const char* kHistoryFileName;
58 static const int kMaxHistoryEntries;
59
60 private:
61 static char** AttemptedCompletion(const char* text, int start, int end);
62 static char* CompletionGenerator(const char* text, int state);
63 static char kWordBreakCharacters[];
64 };
65
66
67 static ReadLineEditor read_line_editor;
68 char ReadLineEditor::kWordBreakCharacters[] = {' ', '\t', '\n', '"',
69 '\\', '\'', '`', '@', '.', '>', '<', '=', ';', '|', '&', '{', '(',
70 '\0'};
71
72
73 const char* ReadLineEditor::kHistoryFileName = ".d8_history";
74 const int ReadLineEditor::kMaxHistoryEntries = 1000;
75
76
Open()77 bool ReadLineEditor::Open() {
78 rl_initialize();
79 rl_attempted_completion_function = AttemptedCompletion;
80 rl_completer_word_break_characters = kWordBreakCharacters;
81 rl_bind_key('\t', rl_complete);
82 using_history();
83 stifle_history(kMaxHistoryEntries);
84 return read_history(kHistoryFileName) == 0;
85 }
86
87
Close()88 bool ReadLineEditor::Close() {
89 return write_history(kHistoryFileName) == 0;
90 }
91
92
Prompt(const char * prompt)93 Handle<String> ReadLineEditor::Prompt(const char* prompt) {
94 char* result = NULL;
95 { // Release lock for blocking input.
96 Unlocker unlock(Isolate::GetCurrent());
97 result = readline(prompt);
98 }
99 if (result != NULL) {
100 AddHistory(result);
101 } else {
102 return Handle<String>();
103 }
104 return String::New(result);
105 }
106
107
AddHistory(const char * str)108 void ReadLineEditor::AddHistory(const char* str) {
109 // Do not record empty input.
110 if (strlen(str) == 0) return;
111 // Remove duplicate history entry.
112 history_set_pos(history_length-1);
113 if (current_history()) {
114 do {
115 if (strcmp(current_history()->line, str) == 0) {
116 remove_history(where_history());
117 break;
118 }
119 } while (previous_history());
120 }
121 add_history(str);
122 }
123
124
AttemptedCompletion(const char * text,int start,int end)125 char** ReadLineEditor::AttemptedCompletion(const char* text,
126 int start,
127 int end) {
128 char** result = completion_matches(text, CompletionGenerator);
129 rl_attempted_completion_over = true;
130 return result;
131 }
132
133
CompletionGenerator(const char * text,int state)134 char* ReadLineEditor::CompletionGenerator(const char* text, int state) {
135 static unsigned current_index;
136 static Persistent<Array> current_completions;
137 if (state == 0) {
138 HandleScope scope;
139 Local<String> full_text = String::New(rl_line_buffer, rl_point);
140 Handle<Array> completions =
141 Shell::GetCompletions(String::New(text), full_text);
142 current_completions = Persistent<Array>::New(completions);
143 current_index = 0;
144 }
145 if (current_index < current_completions->Length()) {
146 HandleScope scope;
147 Handle<Integer> index = Integer::New(current_index);
148 Handle<Value> str_obj = current_completions->Get(index);
149 current_index++;
150 String::Utf8Value str(str_obj);
151 return strdup(*str);
152 } else {
153 current_completions.Dispose();
154 current_completions.Clear();
155 return NULL;
156 }
157 }
158
159
160 } // namespace v8
161