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/*
* Copyright (C) 2013 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.
*/
package com.android.jack.jayce.v0002.io;
import java.io.IOException;
import java.io.InputStream;
import javax.annotation.CheckForNull;
import javax.annotation.Nonnull;
class Tokenizer {
@Nonnull
private final JayceInputStream in;
@CheckForNull
private Token currentTokenId;
private boolean prefetched;
@Nonnull
private static final Token [] tokenMap = Token.values();
public Tokenizer(@Nonnull InputStream in) {
this.in = new JayceInputStream(in);
}
private void readNextToken() throws IOException {
byte token = in.readByte();
try {
currentTokenId = tokenMap[token];
} catch (ArrayIndexOutOfBoundsException e) {
throw new ParseException("Unknown token: " + token);
}
}
@Nonnull
public Token next() throws IOException {
if (prefetched) {
prefetched = false;
} else {
readNextToken();
}
assert currentTokenId != null;
return currentTokenId;
}
public Token peekNext() throws IOException {
if (!prefetched) {
readNextToken();
prefetched = true;
}
return currentTokenId;
}
public int readInt() throws IOException {
currentTokenId = Token.NUMBER_VALUE;
return in.readInt();
}
public byte readByte() throws IOException {
currentTokenId = Token.NUMBER_VALUE;
return in.readByte();
}
public boolean readBoolean() throws IOException {
return in.readBoolean();
}
public long readLong() throws IOException {
currentTokenId = Token.NUMBER_VALUE;
return in.readLong();
}
public short readShort() throws IOException {
currentTokenId = Token.NUMBER_VALUE;
return in.readShort();
}
public char readChar() throws IOException {
currentTokenId = Token.NUMBER_VALUE;
return in.readChar();
}
public float readFloat() throws IOException {
currentTokenId = Token.NUMBER_VALUE;
return Float.intBitsToFloat(readInt());
}
public double readDouble() throws IOException {
currentTokenId = Token.NUMBER_VALUE;
return Double.longBitsToDouble(readLong());
}
@CheckForNull
public String readString() throws IOException {
return in.readUTF();
}
private void readToken(@Nonnull Token expected) throws IOException {
next();
if (currentTokenId != expected) {
throw new ParseException(
"Unexpected token " + currentTokenId + "while token " + expected + " was expected");
}
}
public void readOpen() {
}
public void readClose() throws IOException {
readToken(Token.RPARENTHESIS);
}
/**
* Reads the character that precedes the file name if present,
* does nothing otherwise.
* @return the character has been found and consumed.
* @throws IOException
*/
public boolean readOpenFileName() throws IOException {
if (peekNext() == Token.SHARP) {
readToken(Token.SHARP);
return true;
}
return false;
}
public void readCloseFileName() {
}
/**
* Reads the character that precedes the current line info if present,
* does nothing otherwise.
* @return the character has been found and consumed.
* @throws IOException
*/
public boolean readOpenLineInfo() throws IOException {
if (peekNext() == Token.LBRACKET) {
readToken(Token.LBRACKET);
return true;
}
return false;
}
public void readCloseLineInfo() {
}
/**
* Reads the token that precedes a catch block id if present,
* does nothing otherwise.
* @return the token has been found and consumed.
* @throws IOException
*/
public boolean readOpenCatchBlockIdAdd() throws IOException {
if (peekNext() == Token.LCURLY_ADD) {
readToken(Token.LCURLY_ADD);
return true;
}
return false;
}
/**
* Reads the token that precedes a catch block id if present,
* does nothing otherwise.
* @return the token has been found and consumed.
* @throws IOException
*/
public boolean readOpenCatchBlockIdRemove() throws IOException {
if (peekNext() == Token.LCURLY_REMOVE) {
readToken(Token.LCURLY_REMOVE);
return true;
}
return false;
}
public void readCloseCatchBlockId() {
}
}
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