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 #include <cstdio> // NOLINT 29 #include <string.h> // 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 // There are incompatibilities between different versions and different 39 // implementations of readline. This smooths out one known incompatibility. 40 #if RL_READLINE_VERSION >= 0x0500 41 #define completion_matches rl_completion_matches 42 #endif 43 44 45 namespace v8 { 46 47 48 class ReadLineEditor: public LineEditor { 49 public: 50 ReadLineEditor() : LineEditor(LineEditor::READLINE, "readline") { } 51 virtual Handle<String> Prompt(const char* prompt); 52 virtual bool Open(Isolate* isolate); 53 virtual bool Close(); 54 virtual void AddHistory(const char* str); 55 56 static const char* kHistoryFileName; 57 static const int kMaxHistoryEntries; 58 59 private: 60 #ifndef V8_SHARED 61 static char** AttemptedCompletion(const char* text, int start, int end); 62 static char* CompletionGenerator(const char* text, int state); 63 #endif // V8_SHARED 64 static char kWordBreakCharacters[]; 65 66 Isolate* isolate_; 67 }; 68 69 70 static ReadLineEditor read_line_editor; 71 char ReadLineEditor::kWordBreakCharacters[] = {' ', '\t', '\n', '"', 72 '\\', '\'', '`', '@', '.', '>', '<', '=', ';', '|', '&', '{', '(', 73 '\0'}; 74 75 76 const char* ReadLineEditor::kHistoryFileName = ".d8_history"; 77 const int ReadLineEditor::kMaxHistoryEntries = 1000; 78 79 80 bool ReadLineEditor::Open(Isolate* isolate) { 81 isolate_ = isolate; 82 83 rl_initialize(); 84 85 #ifdef V8_SHARED 86 // Don't do completion on shared library mode 87 // http://cnswww.cns.cwru.edu/php/chet/readline/readline.html#SEC24 88 rl_bind_key('\t', rl_insert); 89 #else 90 rl_attempted_completion_function = AttemptedCompletion; 91 #endif // V8_SHARED 92 93 rl_completer_word_break_characters = kWordBreakCharacters; 94 rl_bind_key('\t', rl_complete); 95 using_history(); 96 stifle_history(kMaxHistoryEntries); 97 return read_history(kHistoryFileName) == 0; 98 } 99 100 101 bool ReadLineEditor::Close() { 102 return write_history(kHistoryFileName) == 0; 103 } 104 105 106 Handle<String> ReadLineEditor::Prompt(const char* prompt) { 107 char* result = NULL; 108 { // Release lock for blocking input. 109 Unlocker unlock(Isolate::GetCurrent()); 110 result = readline(prompt); 111 } 112 if (result == NULL) return Handle<String>(); 113 AddHistory(result); 114 return String::NewFromUtf8(isolate_, result); 115 } 116 117 118 void ReadLineEditor::AddHistory(const char* str) { 119 // Do not record empty input. 120 if (strlen(str) == 0) return; 121 // Remove duplicate history entry. 122 history_set_pos(history_length-1); 123 if (current_history()) { 124 do { 125 if (strcmp(current_history()->line, str) == 0) { 126 remove_history(where_history()); 127 break; 128 } 129 } while (previous_history()); 130 } 131 add_history(str); 132 } 133 134 135 #ifndef V8_SHARED 136 char** ReadLineEditor::AttemptedCompletion(const char* text, 137 int start, 138 int end) { 139 char** result = completion_matches(text, CompletionGenerator); 140 rl_attempted_completion_over = true; 141 return result; 142 } 143 144 145 char* ReadLineEditor::CompletionGenerator(const char* text, int state) { 146 static unsigned current_index; 147 static Persistent<Array> current_completions; 148 Isolate* isolate = read_line_editor.isolate_; 149 Locker lock(isolate); 150 HandleScope scope(isolate); 151 Handle<Array> completions; 152 if (state == 0) { 153 Local<String> full_text = String::NewFromUtf8(isolate, 154 rl_line_buffer, 155 String::kNormalString, 156 rl_point); 157 completions = Shell::GetCompletions(isolate, 158 String::NewFromUtf8(isolate, text), 159 full_text); 160 current_completions.Reset(isolate, completions); 161 current_index = 0; 162 } else { 163 completions = Local<Array>::New(isolate, current_completions); 164 } 165 if (current_index < completions->Length()) { 166 Handle<Integer> index = Integer::New(current_index); 167 Handle<Value> str_obj = completions->Get(index); 168 current_index++; 169 String::Utf8Value str(str_obj); 170 return strdup(*str); 171 } else { 172 current_completions.Reset(); 173 return NULL; 174 } 175 } 176 #endif // V8_SHARED 177 178 179 } // namespace v8 180
