129 lines
2.8 KiB
C++
129 lines
2.8 KiB
C++
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// Copyright (C) 2015 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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#include "tokenizer.h"
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namespace init {
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Tokenizer::Tokenizer(const std::string& data)
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: data_(data), eof_(false), pos_(0), tok_start_(0) {
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current_.type = TOK_START;
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if (data.size() > 0) {
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cur_char_ = data[0];
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} else {
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eof_ = true;
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cur_char_ = '\0';
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}
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}
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Tokenizer::~Tokenizer() {}
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const Tokenizer::Token& Tokenizer::current() {
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return current_;
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}
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bool Tokenizer::Next() {
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while (!eof_) {
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AdvWhiteSpace();
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// Check for comments.
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if (cur_char_ == '#') {
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AdvChar();
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// Skip rest of line
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while (!eof_ && cur_char_ != '\n') {
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AdvChar();
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}
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}
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if (eof_) {
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break;
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}
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if (cur_char_ == '\0') {
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AdvChar();
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} else if (cur_char_ == '\n') {
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current_.type = TOK_NEWLINE;
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current_.text.clear();
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AdvChar();
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return true;
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} else if (cur_char_ == '\\') {
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AdvChar(); // skip backslash
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// This is line continuation so
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// do not generated TOK_NEWLINE at
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// the next \n.
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AdvUntil('\n');
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AdvChar(); // skip \n
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} else if (cur_char_ == '\"') {
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AdvChar();
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StartText();
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// Grab everything until the next quote.
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AdvUntil('\"');
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EndText();
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AdvChar(); // skip quote.
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return true;
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} else {
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StartText();
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AdvText();
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EndText();
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return true;
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}
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}
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current_.type = TOK_END;
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current_.text.clear();
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return false;
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}
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void Tokenizer::AdvChar() {
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pos_++;
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if (pos_ < data_.size()) {
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cur_char_ = data_[pos_];
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} else {
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eof_ = true;
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cur_char_ = '\0';
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}
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}
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void Tokenizer::AdvWhiteSpace() {
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while (cur_char_ == '\t' || cur_char_ == '\r' || cur_char_ == ' ') {
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AdvChar();
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}
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}
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void Tokenizer::AdvUntil(char x) {
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while (!eof_ && cur_char_ != x) {
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AdvChar();
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}
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}
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void Tokenizer::AdvText() {
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while (cur_char_ != '\t' && cur_char_ != '\r' && cur_char_ != '\0' &&
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cur_char_ != ' ' && cur_char_ != '\n' && cur_char_ != '#') {
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AdvChar();
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}
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}
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void Tokenizer::StartText() {
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current_.text.clear();
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tok_start_ = pos_;
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current_.type = TOK_TEXT;
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}
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void Tokenizer::EndText() {
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if (pos_ != tok_start_) {
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current_.text.append(data_, tok_start_, pos_ - tok_start_);
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}
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}
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} // namespace init
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