mirror of https://gitee.com/bigwinds/arangodb
432 lines
12 KiB
C++
432 lines
12 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief V8 line editor
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2004-2012 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is triAGENS GmbH, Cologne, Germany
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///
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/// @author Dr. Frank Celler
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/// @author Copyright 2011-2012, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#include "V8LineEditor.h"
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#include <readline/readline.h>
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#include <readline/history.h>
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#include "BasicsC/strings.h"
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#include "V8/v8-utils.h"
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#if RL_READLINE_VERSION >= 0x0500
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#define completion_matches rl_completion_matches
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#endif
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using namespace std;
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// -----------------------------------------------------------------------------
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// --SECTION-- class V8LineEditor
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// -----------------------------------------------------------------------------
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// -----------------------------------------------------------------------------
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// --SECTION-- private variables
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @addtogroup V8Shell
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief word break characters
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////////////////////////////////////////////////////////////////////////////////
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static char WordBreakCharacters[] = {
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' ', '\t', '\n', '"', '\\', '\'', '`', '@',
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'<', '>', '=', ';', '|', '&', '{', '}', '(', ')',
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'\0'
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};
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////////////////////////////////////////////////////////////////////////////////
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/// @}
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////////////////////////////////////////////////////////////////////////////////
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// -----------------------------------------------------------------------------
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// --SECTION-- private functions
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @addtogroup V8LineEditor
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief completion generator
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////////////////////////////////////////////////////////////////////////////////
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static char* CompletionGenerator (char const* text, int state) {
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static size_t currentIndex;
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static vector<string> result;
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char* prefix;
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// compute the possible completion
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if (state == 0) {
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if (! v8::Context::InContext()) {
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return 0;
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}
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// locate global object or sub-object
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v8::Handle<v8::Object> current = v8::Context::GetCurrent()->Global();
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string path;
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if (*text != '\0') {
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TRI_vector_string_t splitted = TRI_SplitString(text, '.');
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if (1 < splitted._length) {
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for (size_t i = 0; i < splitted._length - 1; ++i) {
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v8::Handle<v8::String> name = v8::String::New(splitted._buffer[i]);
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if (! current->Has(name)) {
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TRI_DestroyVectorString(&splitted);
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return 0;
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}
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v8::Handle<v8::Value> val = current->Get(name);
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if (! val->IsObject()) {
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TRI_DestroyVectorString(&splitted);
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return 0;
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}
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current = val->ToObject();
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path = path + splitted._buffer[i] + ".";
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}
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prefix = TRI_DuplicateString(splitted._buffer[splitted._length - 1]);
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}
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else {
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prefix = TRI_DuplicateString(text);
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}
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TRI_DestroyVectorString(&splitted);
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}
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else {
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prefix = TRI_DuplicateString(text);
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}
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// compute all possible completions
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v8::Handle<v8::Array> properties;
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v8::Handle<v8::String> cpl = v8::String::New("_COMPLETIONS");
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if (current->HasOwnProperty(cpl)) {
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v8::Handle<v8::Value> funcVal = current->Get(cpl);
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if (funcVal->IsFunction()) {
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v8::Handle<v8::Function> func = v8::Handle<v8::Function>::Cast(funcVal);
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v8::Handle<v8::Value> args;
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v8::Handle<v8::Value> cpls = func->Call(current, 0, &args);
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if (cpls->IsArray()) {
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properties = v8::Handle<v8::Array>::Cast(cpls);
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}
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}
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}
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else {
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properties = current->GetPropertyNames();
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}
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// locate
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if (! properties.IsEmpty()) {
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size_t n = properties->Length();
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for (size_t i = 0; i < n; ++i) {
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v8::Handle<v8::Value> v = properties->Get(i);
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TRI_Utf8ValueNFC str(TRI_UNKNOWN_MEM_ZONE, v);
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char const* s = *str;
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if (s != 0 && *s) {
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string suffix = (current->Get(v)->IsFunction()) ? "()" : "";
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string name = path + s + suffix;
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if (*prefix == '\0' || TRI_IsPrefixString(s, prefix)) {
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result.push_back(name);
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}
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}
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}
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}
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currentIndex = 0;
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TRI_FreeString(TRI_CORE_MEM_ZONE, prefix);
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}
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if (currentIndex < result.size()) {
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return TRI_SystemDuplicateString(result[currentIndex++].c_str());
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}
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else {
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result.clear();
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return 0;
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief attempted completion
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////////////////////////////////////////////////////////////////////////////////
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static char** AttemptedCompletion (char const* text, int start, int end) {
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char** result;
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result = completion_matches(text, CompletionGenerator);
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rl_attempted_completion_over = true;
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if (result != 0 && result[0] != 0 && result[1] == 0) {
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size_t n = strlen(result[0]);
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if (result[0][n - 1] == ')') {
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result[0][n - 1] = '\0';
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}
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}
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#if RL_READLINE_VERSION >= 0x0500
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// issue #289
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rl_completion_suppress_append = 1;
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#endif
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return result;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @}
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////////////////////////////////////////////////////////////////////////////////
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors and destructors
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @addtogroup V8LineEditor
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief constructs a new editor
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////////////////////////////////////////////////////////////////////////////////
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V8LineEditor::V8LineEditor (v8::Handle<v8::Context> context, std::string const& history)
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: LineEditor(history), _context(context) {
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @}
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////////////////////////////////////////////////////////////////////////////////
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// -----------------------------------------------------------------------------
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// --SECTION-- public methods
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @addtogroup V8LineEditor
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief line editor open
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////////////////////////////////////////////////////////////////////////////////
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bool V8LineEditor::open (const bool autoComplete) {
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if (autoComplete) {
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// issue #289: do not append a space after completion
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rl_completion_append_character = '\0';
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rl_attempted_completion_function = AttemptedCompletion;
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rl_completer_word_break_characters = WordBreakCharacters;
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rl_bind_key('\t', rl_complete);
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}
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return LineEditor::open(autoComplete);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @}
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////////////////////////////////////////////////////////////////////////////////
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// -----------------------------------------------------------------------------
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// --SECTION-- protected methods
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @addtogroup LineEditor
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief check if line is complete
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////////////////////////////////////////////////////////////////////////////////
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bool V8LineEditor::isComplete (string const& source, size_t, size_t) {
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char const* ptr;
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char const* end;
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int openParen;
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int openBrackets;
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int openBraces;
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enum {
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NORMAL, // start
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NORMAL_1, // from NORMAL: seen a single /
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DOUBLE_QUOTE, // from NORMAL: seen a single "
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DOUBLE_QUOTE_ESC, // from DOUBLE_QUOTE: seen a backslash
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SINGLE_QUOTE, // from NORMAL: seen a single '
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SINGLE_QUOTE_ESC, // from SINGLE_QUOTE: seen a backslash
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MULTI_COMMENT, // from NORMAL_1: seen a *
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MULTI_COMMENT_1, // from MULTI_COMMENT, seen a *
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SINGLE_COMMENT // from NORMAL_1; seen a /
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}
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state;
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openParen = 0;
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openBrackets = 0;
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openBraces = 0;
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ptr = source.c_str();
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end = ptr + source.length();
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state = NORMAL;
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while (ptr < end) {
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if (state == DOUBLE_QUOTE) {
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if (*ptr == '\\') {
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state = DOUBLE_QUOTE_ESC;
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}
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else if (*ptr == '"') {
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state = NORMAL;
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}
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++ptr;
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}
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else if (state == DOUBLE_QUOTE_ESC) {
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state = DOUBLE_QUOTE;
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ptr++;
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}
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else if (state == SINGLE_QUOTE) {
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if (*ptr == '\\') {
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state = SINGLE_QUOTE_ESC;
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}
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else if (*ptr == '\'') {
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state = NORMAL;
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}
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++ptr;
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}
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else if (state == SINGLE_QUOTE_ESC) {
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state = SINGLE_QUOTE;
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ptr++;
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}
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else if (state == MULTI_COMMENT) {
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if (*ptr == '*') {
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state = MULTI_COMMENT_1;
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}
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++ptr;
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}
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else if (state == MULTI_COMMENT_1) {
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if (*ptr == '/') {
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state = NORMAL;
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}
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++ptr;
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}
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else if (state == SINGLE_COMMENT) {
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++ptr;
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if (ptr == end) {
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state = NORMAL;
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}
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}
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else if (state == NORMAL_1) {
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switch (*ptr) {
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case '/':
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state = SINGLE_COMMENT;
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++ptr;
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break;
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case '*':
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state = MULTI_COMMENT;
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++ptr;
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break;
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default:
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state = NORMAL; // try again, do not change ptr
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break;
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}
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}
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else {
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switch (*ptr) {
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case '"':
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state = DOUBLE_QUOTE;
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break;
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case '\'':
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state = SINGLE_QUOTE;
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break;
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case '/':
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state = NORMAL_1;
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break;
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case '(':
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++openParen;
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break;
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case ')':
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--openParen;
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break;
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case '[':
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++openBrackets;
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break;
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case ']':
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--openBrackets;
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break;
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case '{':
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++openBraces;
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break;
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case '}':
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--openBraces;
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break;
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}
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++ptr;
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}
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}
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return openParen <= 0 && openBrackets <= 0 && openBraces <= 0;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @}
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////////////////////////////////////////////////////////////////////////////////
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "^\\(/// @brief\\|/// {@inheritDoc}\\|/// @addtogroup\\|/// @page\\|// --SECTION--\\|/// @\\}\\)"
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// End:
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