Source Code Cross Referenced for CharStream.java in  » Code-Analyzer » pmd-4.2rc1 » net » sourceforge » pmd » ast » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Code Analyzer » pmd 4.2rc1 » net.sourceforge.pmd.ast 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Generated By:JavaCC: Do not edit this line. CharStream.java Version 4.0 */
002:        package net.sourceforge.pmd.ast;
003:
004:        /**
005:         * This interface describes a character stream that maintains line and
006:         * column number positions of the characters.  It also has the capability
007:         * to backup the stream to some extent.  An implementation of this
008:         * interface is used in the TokenManager implementation generated by
009:         * JavaCCParser.
010:         * <p/>
011:         * All the methods except backup can be implemented in any fashion. backup
012:         * needs to be implemented correctly for the correct operation of the lexer.
013:         * Rest of the methods are all used to get information like line number,
014:         * column number and the String that constitutes a token and are not used
015:         * by the lexer. Hence their implementation won't affect the generated lexer's
016:         * operation.
017:         */
018:
019:        public interface CharStream {
020:
021:            /**
022:             * Returns the next character from the selected input.  The method
023:             * of selecting the input is the responsibility of the class
024:             * implementing this interface.  Can throw any java.io.IOException.
025:             */
026:            char readChar() throws java.io.IOException;
027:
028:            /**
029:             * Returns the column position of the character last read.
030:             *
031:             * @see #getEndColumn
032:             * @deprecated
033:             */
034:            int getColumn();
035:
036:            /**
037:             * Returns the line number of the character last read.
038:             *
039:             * @see #getEndLine
040:             * @deprecated
041:             */
042:            int getLine();
043:
044:            /**
045:             * Returns the column number of the last character for current token (being
046:             * matched after the last call to BeginTOken).
047:             */
048:            int getEndColumn();
049:
050:            /**
051:             * Returns the line number of the last character for current token (being
052:             * matched after the last call to BeginTOken).
053:             */
054:            int getEndLine();
055:
056:            /**
057:             * Returns the column number of the first character for current token (being
058:             * matched after the last call to BeginTOken).
059:             */
060:            int getBeginColumn();
061:
062:            /**
063:             * Returns the line number of the first character for current token (being
064:             * matched after the last call to BeginTOken).
065:             */
066:            int getBeginLine();
067:
068:            /**
069:             * Backs up the input stream by amount steps. Lexer calls this method if it
070:             * had already read some characters, but could not use them to match a
071:             * (longer) token. So, they will be used again as the prefix of the next
072:             * token and it is the implemetation's responsibility to do this right.
073:             */
074:            void backup(int amount);
075:
076:            /**
077:             * Returns the next character that marks the beginning of the next token.
078:             * All characters must remain in the buffer between two successive calls
079:             * to this method to implement backup correctly.
080:             */
081:            char BeginToken() throws java.io.IOException;
082:
083:            /**
084:             * Returns a string made up of characters from the marked token beginning
085:             * to the current buffer position. Implementations have the choice of returning
086:             * anything that they want to. For example, for efficiency, one might decide
087:             * to just return null, which is a valid implementation.
088:             */
089:            String GetImage();
090:
091:            /**
092:             * Returns an array of characters that make up the suffix of length 'len' for
093:             * the currently matched token. This is used to build up the matched string
094:             * for use in actions in the case of MORE. A simple and inefficient
095:             * implementation of this is as follows :
096:             * <p/>
097:             * {
098:             * String t = GetImage();
099:             * return t.substring(t.length() - len, t.length()).toCharArray();
100:             * }
101:             */
102:            char[] GetSuffix(int len);
103:
104:            /**
105:             * The lexer calls this function to indicate that it is done with the stream
106:             * and hence implementations can free any resources held by this class.
107:             * Again, the body of this function can be just empty and it will not
108:             * affect the lexer's operation.
109:             */
110:            void Done();
111:
112:        }
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