import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

widget/gonk/libui/Tokenizer.cpp

@@ -0,0 +1,175 @@
+/*
+ * 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 "Tokenizer"
+#include "cutils_log.h"
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include "Tokenizer.h"
+
+// Enables debug output for the tokenizer.
+#define DEBUG_TOKENIZER 0
+
+
+namespace android {
+
+static inline bool isDelimiter(char ch, const char* delimiters) {
+    return strchr(delimiters, ch) != NULL;
+}
+
+Tokenizer::Tokenizer(const String8& filename, FileMap* fileMap, char* buffer,
+        bool ownBuffer, size_t length) :
+        mFilename(filename), mFileMap(fileMap),
+        mBuffer(buffer), mOwnBuffer(ownBuffer), mLength(length),
+        mCurrent(buffer), mLineNumber(1) {
+}
+
+Tokenizer::~Tokenizer() {
+    if (mFileMap) {
+        mFileMap->release();
+    }
+    if (mOwnBuffer) {
+        delete[] mBuffer;
+    }
+}
+
+status_t Tokenizer::open(const String8& filename, Tokenizer** outTokenizer) {
+    *outTokenizer = NULL;
+
+    int result = NO_ERROR;
+    int fd = ::open(filename.string(), O_RDONLY);
+    if (fd < 0) {
+        result = -errno;
+        ALOGE("Error opening file '%s', %s.", filename.string(), strerror(errno));
+    } else {
+        struct stat stat;
+        if (fstat(fd, &stat)) {
+            result = -errno;
+            ALOGE("Error getting size of file '%s', %s.", filename.string(), strerror(errno));
+        } else {
+            size_t length = size_t(stat.st_size);
+
+            FileMap* fileMap = new FileMap();
+            bool ownBuffer = false;
+            char* buffer;
+            if (fileMap->create(NULL, fd, 0, length, true)) {
+                fileMap->advise(FileMap::SEQUENTIAL);
+                buffer = static_cast<char*>(fileMap->getDataPtr());
+            } else {
+                fileMap->release();
+                fileMap = NULL;
+
+                // Fall back to reading into a buffer since we can't mmap files in sysfs.
+                // The length we obtained from stat is wrong too (it will always be 4096)
+                // so we must trust that read will read the entire file.
+                buffer = new char[length];
+                ownBuffer = true;
+                ssize_t nrd = read(fd, buffer, length);
+                if (nrd < 0) {
+                    result = -errno;
+                    ALOGE("Error reading file '%s', %s.", filename.string(), strerror(errno));
+                    delete[] buffer;
+                    buffer = NULL;
+                } else {
+                    length = size_t(nrd);
+                }
+            }
+
+            if (!result) {
+                *outTokenizer = new Tokenizer(filename, fileMap, buffer, ownBuffer, length);
+            }
+        }
+        close(fd);
+    }
+    return result;
+}
+
+status_t Tokenizer::fromContents(const String8& filename,
+        const char* contents, Tokenizer** outTokenizer) {
+    *outTokenizer = new Tokenizer(filename, NULL,
+            const_cast<char*>(contents), false, strlen(contents));
+    return OK;
+}
+
+String8 Tokenizer::getLocation() const {
+    String8 result;
+    result.appendFormat("%s:%d", mFilename.string(), mLineNumber);
+    return result;
+}
+
+String8 Tokenizer::peekRemainderOfLine() const {
+    const char* end = getEnd();
+    const char* eol = mCurrent;
+    while (eol != end) {
+        char ch = *eol;
+        if (ch == '\n') {
+            break;
+        }
+        eol += 1;
+    }
+    return String8(mCurrent, eol - mCurrent);
+}
+
+String8 Tokenizer::nextToken(const char* delimiters) {
+#if DEBUG_TOKENIZER
+    ALOGD("nextToken");
+#endif
+    const char* end = getEnd();
+    const char* tokenStart = mCurrent;
+    while (mCurrent != end) {
+        char ch = *mCurrent;
+        if (ch == '\n' || isDelimiter(ch, delimiters)) {
+            break;
+        }
+        mCurrent += 1;
+    }
+    return String8(tokenStart, mCurrent - tokenStart);
+}
+
+void Tokenizer::nextLine() {
+#if DEBUG_TOKENIZER
+    ALOGD("nextLine");
+#endif
+    const char* end = getEnd();
+    while (mCurrent != end) {
+        char ch = *(mCurrent++);
+        if (ch == '\n') {
+            mLineNumber += 1;
+            break;
+        }
+    }
+}
+
+void Tokenizer::skipDelimiters(const char* delimiters) {
+#if DEBUG_TOKENIZER
+    ALOGD("skipDelimiters");
+#endif
+    const char* end = getEnd();
+    while (mCurrent != end) {
+        char ch = *mCurrent;
+        if (ch == '\n' || !isDelimiter(ch, delimiters)) {
+            break;
+        }
+        mCurrent += 1;
+    }
+}
+
+} // namespace android