You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
129 lines
2.8 KiB
129 lines
2.8 KiB
// Copyright (C) 2015 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.
|
|
|
|
#include "tokenizer.h"
|
|
|
|
namespace init {
|
|
|
|
Tokenizer::Tokenizer(const std::string& data)
|
|
: data_(data), eof_(false), pos_(0), tok_start_(0) {
|
|
current_.type = TOK_START;
|
|
|
|
if (data.size() > 0) {
|
|
cur_char_ = data[0];
|
|
} else {
|
|
eof_ = true;
|
|
cur_char_ = '\0';
|
|
}
|
|
}
|
|
|
|
Tokenizer::~Tokenizer() {}
|
|
|
|
const Tokenizer::Token& Tokenizer::current() {
|
|
return current_;
|
|
}
|
|
|
|
bool Tokenizer::Next() {
|
|
while (!eof_) {
|
|
AdvWhiteSpace();
|
|
|
|
// Check for comments.
|
|
if (cur_char_ == '#') {
|
|
AdvChar();
|
|
// Skip rest of line
|
|
while (!eof_ && cur_char_ != '\n') {
|
|
AdvChar();
|
|
}
|
|
}
|
|
|
|
if (eof_) {
|
|
break;
|
|
}
|
|
|
|
if (cur_char_ == '\0') {
|
|
AdvChar();
|
|
} else if (cur_char_ == '\n') {
|
|
current_.type = TOK_NEWLINE;
|
|
current_.text.clear();
|
|
AdvChar();
|
|
return true;
|
|
} else if (cur_char_ == '\\') {
|
|
AdvChar(); // skip backslash
|
|
// This is line continuation so
|
|
// do not generated TOK_NEWLINE at
|
|
// the next \n.
|
|
AdvUntil('\n');
|
|
AdvChar(); // skip \n
|
|
} else if (cur_char_ == '\"') {
|
|
AdvChar();
|
|
StartText();
|
|
// Grab everything until the next quote.
|
|
AdvUntil('\"');
|
|
EndText();
|
|
AdvChar(); // skip quote.
|
|
return true;
|
|
} else {
|
|
StartText();
|
|
AdvText();
|
|
EndText();
|
|
return true;
|
|
}
|
|
}
|
|
current_.type = TOK_END;
|
|
current_.text.clear();
|
|
return false;
|
|
}
|
|
|
|
void Tokenizer::AdvChar() {
|
|
pos_++;
|
|
if (pos_ < data_.size()) {
|
|
cur_char_ = data_[pos_];
|
|
} else {
|
|
eof_ = true;
|
|
cur_char_ = '\0';
|
|
}
|
|
}
|
|
|
|
void Tokenizer::AdvWhiteSpace() {
|
|
while (cur_char_ == '\t' || cur_char_ == '\r' || cur_char_ == ' ') {
|
|
AdvChar();
|
|
}
|
|
}
|
|
|
|
void Tokenizer::AdvUntil(char x) {
|
|
while (!eof_ && cur_char_ != x) {
|
|
AdvChar();
|
|
}
|
|
}
|
|
|
|
void Tokenizer::AdvText() {
|
|
while (cur_char_ != '\t' && cur_char_ != '\r' && cur_char_ != '\0' &&
|
|
cur_char_ != ' ' && cur_char_ != '\n' && cur_char_ != '#') {
|
|
AdvChar();
|
|
}
|
|
}
|
|
|
|
void Tokenizer::StartText() {
|
|
current_.text.clear();
|
|
tok_start_ = pos_;
|
|
current_.type = TOK_TEXT;
|
|
}
|
|
|
|
void Tokenizer::EndText() {
|
|
if (pos_ != tok_start_) {
|
|
current_.text.append(data_, tok_start_, pos_ - tok_start_);
|
|
}
|
|
}
|
|
|
|
} // namespace init
|