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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "VirtualKeyMap"
#include <stdlib.h>
#include <string.h>
#include <input/VirtualKeyMap.h>
#include <utils/Log.h>
#include <utils/Errors.h>
#include <utils/Tokenizer.h>
#include <utils/Timers.h>
// Enables debug output for the parser.
#define DEBUG_PARSER 0
namespace android {
static const char* WHITESPACE = " \t\r";
static const char* WHITESPACE_OR_FIELD_DELIMITER = " \t\r:";
// --- VirtualKeyMap ---
VirtualKeyMap::VirtualKeyMap() {
}
VirtualKeyMap::~VirtualKeyMap() {
}
std::unique_ptr<VirtualKeyMap> VirtualKeyMap::load(const std::string& filename) {
Tokenizer* t;
status_t status = Tokenizer::open(String8(filename.c_str()), &t);
if (status != OK) {
ALOGE("Error %d opening virtual key map file %s.", status, filename.c_str());
return nullptr;
}
std::unique_ptr<Tokenizer> tokenizer(t);
// Using 'new' to access a non-public constructor
std::unique_ptr<VirtualKeyMap> map(new VirtualKeyMap());
if (!map) {
ALOGE("Error allocating virtual key map.");
return nullptr;
}
Parser parser(map.get(), tokenizer.get());
status = parser.parse();
if (status != OK) {
return nullptr;
}
return map;
}
// --- VirtualKeyMap::Parser ---
VirtualKeyMap::Parser::Parser(VirtualKeyMap* map, Tokenizer* tokenizer) :
mMap(map), mTokenizer(tokenizer) {
}
VirtualKeyMap::Parser::~Parser() {
}
status_t VirtualKeyMap::Parser::parse() {
while (!mTokenizer->isEof()) {
#if DEBUG_PARSER
ALOGD("Parsing %s: '%s'.", mTokenizer->getLocation().c_str(),
mTokenizer->peekRemainderOfLine().c_str());
#endif
mTokenizer->skipDelimiters(WHITESPACE);
if (!mTokenizer->isEol() && mTokenizer->peekChar() != '#') {
// Multiple keys can appear on one line or they can be broken up across multiple lines.
do {
String8 token = mTokenizer->nextToken(WHITESPACE_OR_FIELD_DELIMITER);
if (token != "0x01") {
ALOGE("%s: Unknown virtual key type, expected 0x01.",
mTokenizer->getLocation().c_str());
return BAD_VALUE;
}
VirtualKeyDefinition defn;
bool success = parseNextIntField(&defn.scanCode)
&& parseNextIntField(&defn.centerX)
&& parseNextIntField(&defn.centerY)
&& parseNextIntField(&defn.width)
&& parseNextIntField(&defn.height);
if (!success) {
ALOGE("%s: Expected 5 colon-delimited integers in virtual key definition.",
mTokenizer->getLocation().c_str());
return BAD_VALUE;
}
#if DEBUG_PARSER
ALOGD("Parsed virtual key: scanCode=%d, centerX=%d, centerY=%d, "
"width=%d, height=%d",
defn.scanCode, defn.centerX, defn.centerY, defn.width, defn.height);
#endif
mMap->mVirtualKeys.push_back(defn);
} while (consumeFieldDelimiterAndSkipWhitespace());
if (!mTokenizer->isEol()) {
ALOGE("%s: Expected end of line, got '%s'.", mTokenizer->getLocation().c_str(),
mTokenizer->peekRemainderOfLine().c_str());
return BAD_VALUE;
}
}
mTokenizer->nextLine();
}
return NO_ERROR;
}
bool VirtualKeyMap::Parser::consumeFieldDelimiterAndSkipWhitespace() {
mTokenizer->skipDelimiters(WHITESPACE);
if (mTokenizer->peekChar() == ':') {
mTokenizer->nextChar();
mTokenizer->skipDelimiters(WHITESPACE);
return true;
}
return false;
}
bool VirtualKeyMap::Parser::parseNextIntField(int32_t* outValue) {
if (!consumeFieldDelimiterAndSkipWhitespace()) {
return false;
}
String8 token = mTokenizer->nextToken(WHITESPACE_OR_FIELD_DELIMITER);
char* end;
*outValue = strtol(token.c_str(), &end, 0);
if (token.empty() || *end != '\0') {
ALOGE("Expected an integer, got '%s'.", token.c_str());
return false;
}
return true;
}
} // namespace android
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