jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/parser/Scanner.java@7375d4979bd3

     1 /*

     2  * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    26 package com.sun.tools.javac.parser;

    28 import java.nio.*;

    30 import com.sun.tools.javac.util.*;

    31 import com.sun.tools.javac.util.Position.LineMap;

    32 import com.sun.tools.javac.parser.JavaTokenizer.*;

    34 import static com.sun.tools.javac.parser.Tokens.*;

    36 /** The lexical analyzer maps an input stream consisting of

    37  *  ASCII characters and Unicode escapes into a token sequence.

    38  *

    39  *  <p><b>This is NOT part of any supported API.

    40  *  If you write code that depends on this, you do so at your own risk.

    41  *  This code and its internal interfaces are subject to change or

    42  *  deletion without notice.</b>

    43  */

    44 public class Scanner implements Lexer {

    46     private Tokens tokens;

    48     /** The token, set by nextToken().

    49      */

    50     private Token token;

    52     /** The previous token, set by nextToken().

    53      */

    54     private Token prevToken;

    56     private JavaTokenizer tokenizer;

    57     /**

    58      * Create a scanner from the input array.  This method might

    59      * modify the array.  To avoid copying the input array, ensure

    60      * that {@code inputLength < input.length} or

    61      * {@code input[input.length -1]} is a white space character.

    62      *

    63      * @param fac the factory which created this Scanner

    64      * @param input the input, might be modified

    65      * @param inputLength the size of the input.

    66      * Must be positive and less than or equal to input.length.

    67      */

    68     protected Scanner(ScannerFactory fac, CharBuffer buf) {

    69         this(fac, new JavaTokenizer(fac, buf));

    70     }

    72     protected Scanner(ScannerFactory fac, char[] buf, int inputLength) {

    73         this(fac, new JavaTokenizer(fac, buf, inputLength));

    74     }

    76     protected Scanner(ScannerFactory fac, JavaTokenizer tokenizer) {

    77         this.tokenizer = tokenizer;

    78         tokens = fac.tokens;

    79         token = prevToken = DUMMY;

    80     }

    82     public Token token() {

    83         return token;

    84     }

    86     public Token prevToken() {

    87         return prevToken;

    88     }

    90     public void nextToken() {

    91         prevToken = token;

    92         token = tokenizer.readToken();

    93     }

    95     public Token split() {

    96         Token[] splitTokens = token.split(tokens);

    97         prevToken = splitTokens[0];

    98         token = splitTokens[1];

    99         return token;

   100     }

   102     public LineMap getLineMap() {

   103         return tokenizer.getLineMap();

   104     }

   106     public int errPos() {

   107         return tokenizer.errPos();

   108     }

   110     public void errPos(int pos) {

   111         tokenizer.errPos(pos);

   112     }

   113 }

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