152 lines
4.1 KiB
C++
152 lines
4.1 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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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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#define LOG_TAG "Tokenizer"
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <utils/Log.h>
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#include <utils/Tokenizer.h>
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// Enables debug output for the tokenizer.
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#define DEBUG_TOKENIZER 0
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namespace android {
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static inline bool isDelimiter(char ch, const char* delimiters) {
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return strchr(delimiters, ch) != NULL;
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}
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Tokenizer::Tokenizer(const String8& filename, FileMap* fileMap,
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const char* buffer, size_t length) :
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mFilename(filename), mFileMap(fileMap), mBuffer(buffer), mLength(length),
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mCurrent(buffer), mLineNumber(1) {
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}
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Tokenizer::~Tokenizer() {
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if (mFileMap) {
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mFileMap->release();
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}
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}
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status_t Tokenizer::open(const String8& filename, Tokenizer** outTokenizer) {
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*outTokenizer = NULL;
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int result = NO_ERROR;
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int fd = ::open(filename.string(), O_RDONLY);
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if (fd < 0) {
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result = -errno;
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LOGE("Error opening file '%s', %s.", filename.string(), strerror(errno));
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} else {
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struct stat stat;
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if (fstat(fd, &stat)) {
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result = -errno;
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LOGE("Error getting size of file '%s', %s.", filename.string(), strerror(errno));
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} else {
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size_t length = size_t(stat.st_size);
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FileMap* fileMap = new FileMap();
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if (!fileMap->create(NULL, fd, 0, length, true)) {
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result = NO_MEMORY;
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LOGE("Error mapping file '%s', %s.", filename.string(), strerror(errno));
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} else {
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fileMap->advise(FileMap::SEQUENTIAL);
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*outTokenizer = new Tokenizer(filename, fileMap,
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static_cast<const char*>(fileMap->getDataPtr()), length);
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if (!*outTokenizer) {
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result = NO_MEMORY;
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LOGE("Error allocating tokenizer for file=%s.", filename.string());
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}
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}
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if (result) {
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fileMap->release();
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}
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}
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close(fd);
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}
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return result;
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}
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String8 Tokenizer::getLocation() const {
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String8 result;
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result.appendFormat("%s:%d", mFilename.string(), mLineNumber);
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return result;
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}
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String8 Tokenizer::peekRemainderOfLine() const {
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const char* end = getEnd();
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const char* eol = mCurrent;
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while (eol != end) {
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char ch = *eol;
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if (ch == '\n') {
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break;
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}
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eol += 1;
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}
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return String8(mCurrent, eol - mCurrent);
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}
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String8 Tokenizer::nextToken(const char* delimiters) {
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#if DEBUG_TOKENIZER
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LOGD("nextToken");
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#endif
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const char* end = getEnd();
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const char* tokenStart = mCurrent;
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while (mCurrent != end) {
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char ch = *mCurrent;
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if (ch == '\n' || isDelimiter(ch, delimiters)) {
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break;
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}
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mCurrent += 1;
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}
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return String8(tokenStart, mCurrent - tokenStart);
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}
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void Tokenizer::nextLine() {
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#if DEBUG_TOKENIZER
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LOGD("nextLine");
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#endif
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const char* end = getEnd();
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while (mCurrent != end) {
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char ch = *(mCurrent++);
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if (ch == '\n') {
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mLineNumber += 1;
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break;
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}
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}
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}
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void Tokenizer::skipDelimiters(const char* delimiters) {
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#if DEBUG_TOKENIZER
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LOGD("skipDelimiters");
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#endif
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const char* end = getEnd();
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while (mCurrent != end) {
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char ch = *mCurrent;
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if (ch == '\n' || !isDelimiter(ch, delimiters)) {
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break;
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}
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mCurrent += 1;
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}
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}
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} // namespace android
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