xpathlexer.java

java1.6众多例子参考

/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * 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.
 */
/*
 * $Id: xpath.lex,v 1.12 2005/08/02 02:59:03 mcnamara Exp $
 */
/*
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 * @author Morten Jorgensen
 *
 */
package com.sun.org.apache.xalan.internal.xsltc.compiler;
import com.sun.java_cup.internal.runtime.Symbol;


class XPathLexer implements com.sun.java_cup.internal.runtime.Scanner {
	private final int YY_BUFFER_SIZE = 512;
	private final int YY_F = -1;
	private final int YY_NO_STATE = -1;
	private final int YY_NOT_ACCEPT = 0;
	private final int YY_START = 1;
	private final int YY_END = 2;
	private final int YY_NO_ANCHOR = 4;
	private final int YY_BOL = 65536;
	private final int YY_EOF = 65537;
	public final int YYEOF = -1;

        int last;
        void initialize() {
            last = -1;
        }
        static boolean isWhitespace(int c) {
            return (c == ' ' || c == '\t' || c == '\r' || c == '\n'  || c == '\f');
        }
        /**
         * If symbol is not followed by '::' or '(', then treat it as a
         * name instead of an axis or function (Jira-1912).
         */ 
        Symbol disambiguateAxisOrFunction(int ss) throws Exception {
            // Peek in the input buffer without changing the internal state
            int index = yy_buffer_index;
            // Skip whitespace
            while (index < yy_buffer_read && isWhitespace(yy_buffer[index])) {
                index++;
            }
            // If end of buffer, can't disambiguate :(
            if (index >= yy_buffer_read) {
                // Can't disambiguate, so return as symbol
                return new Symbol(ss);
            }
            // Return symbol if next token is '::' or '('
            return (yy_buffer[index] == ':' && yy_buffer[index+1] == ':' ||
                    yy_buffer[index] == '(') ?
                    newSymbol(ss) : newSymbol(sym.QNAME, yytext());
        }
        /**
         * If symbol is first token or if it follows any of the operators
         * listed in http://www.w3.org/TR/xpath#exprlex then treat as a 
         * name instead of a keyword (Jira-1912).
         */ 
        Symbol disambiguateOperator(int ss) throws Exception {
            switch (last) {
            case -1:    // first token
            case sym.ATSIGN:
            case sym.DCOLON:
            case sym.LPAREN:
            case sym.LBRACK:
            case sym.COMMA:
            case sym.AND:
            case sym.OR:
            case sym.MOD:
            case sym.DIV:
            case sym.STAR:
            case sym.SLASH:
            case sym.DSLASH:
            case sym.VBAR:
            case sym.PLUS:
            case sym.MINUS:
            case sym.EQ:
            case sym.NE:
            case sym.LT:
            case sym.LE:
            case sym.GT:
            case sym.GE:
                return newSymbol(sym.QNAME, yytext());
            }
            return newSymbol(ss);
        }
        Symbol newSymbol(int ss) {
            last = ss;
            return new Symbol(ss);
        }
        Symbol newSymbol(int ss, String value) {
            last = ss;
            return new Symbol(ss, value);
        }
        Symbol newSymbol(int ss, Long value) {
            last = ss;
            return new Symbol(ss, value);
        }
        Symbol newSymbol(int ss, Double value) {
            last = ss;
            return new Symbol(ss, value);
        }
	private java.io.BufferedReader yy_reader;
	private int yy_buffer_index;
	private int yy_buffer_read;
	private int yy_buffer_start;
	private int yy_buffer_end;
	private char yy_buffer[];
	private boolean yy_at_bol;
	private int yy_lexical_state;

	XPathLexer (java.io.Reader reader) {
		this ();
		if (null == reader) {
			throw (new Error("Error: Bad input stream initializer."));
		}
		yy_reader = new java.io.BufferedReader(reader);
	}

	XPathLexer (java.io.InputStream instream) {
		this ();
		if (null == instream) {
			throw (new Error("Error: Bad input stream initializer."));
		}
		yy_reader = new java.io.BufferedReader(new java.io.InputStreamReader(instream));
	}

	private XPathLexer () {
		yy_buffer = new char[YY_BUFFER_SIZE];
		yy_buffer_read = 0;
		yy_buffer_index = 0;
		yy_buffer_start = 0;
		yy_buffer_end = 0;
		yy_at_bol = true;
		yy_lexical_state = YYINITIAL;
	}

	private boolean yy_eof_done = false;
	private final int YYINITIAL = 0;
	private final int yy_state_dtrans[] = {
		0
	};
	private void yybegin (int state) {
		yy_lexical_state = state;
	}
	private int yy_advance ()
		throws java.io.IOException {
		int next_read;
		int i;
		int j;

		if (yy_buffer_index < yy_buffer_read) {
			return yy_buffer[yy_buffer_index++];
		}

		if (0 != yy_buffer_start) {
			i = yy_buffer_start;
			j = 0;
			while (i < yy_buffer_read) {
				yy_buffer[j] = yy_buffer[i];
				++i;
				++j;
			}
			yy_buffer_end = yy_buffer_end - yy_buffer_start;
			yy_buffer_start = 0;
			yy_buffer_read = j;
			yy_buffer_index = j;
			next_read = yy_reader.read(yy_buffer,
					yy_buffer_read,
					yy_buffer.length - yy_buffer_read);
			if (-1 == next_read) {
				return YY_EOF;
			}
			yy_buffer_read = yy_buffer_read + next_read;
		}

		while (yy_buffer_index >= yy_buffer_read) {
			if (yy_buffer_index >= yy_buffer.length) {
				yy_buffer = yy_double(yy_buffer);
			}
			next_read = yy_reader.read(yy_buffer,
					yy_buffer_read,
					yy_buffer.length - yy_buffer_read);
			if (-1 == next_read) {
				return YY_EOF;
			}
			yy_buffer_read = yy_buffer_read + next_read;
		}
		return yy_buffer[yy_buffer_index++];
	}
	private void yy_move_end () {
		if (yy_buffer_end > yy_buffer_start &&
		    '\n' == yy_buffer[yy_buffer_end-1])
			yy_buffer_end--;
		if (yy_buffer_end > yy_buffer_start &&
		    '\r' == yy_buffer[yy_buffer_end-1])
			yy_buffer_end--;
	}
	private boolean yy_last_was_cr=false;
	private void yy_mark_start () {
		yy_buffer_start = yy_buffer_index;
	}
	private void yy_mark_end () {
		yy_buffer_end = yy_buffer_index;
	}
	private void yy_to_mark () {
		yy_buffer_index = yy_buffer_end;
		yy_at_bol = (yy_buffer_end > yy_buffer_start) &&
		            ('\r' == yy_buffer[yy_buffer_end-1] ||
		             '\n' == yy_buffer[yy_buffer_end-1] ||
		             2028/*LS*/ == yy_buffer[yy_buffer_end-1] ||
		             2029/*PS*/ == yy_buffer[yy_buffer_end-1]);
	}
	private java.lang.String yytext () {
		return (new java.lang.String(yy_buffer,
			yy_buffer_start,
			yy_buffer_end - yy_buffer_start));
	}
	private int yylength () {
		return yy_buffer_end - yy_buffer_start;
	}
	private char[] yy_double (char buf[]) {
		int i;
		char newbuf[];
		newbuf = new char[2*buf.length];
		for (i = 0; i < buf.length; ++i) {
			newbuf[i] = buf[i];
		}
		return newbuf;
	}
	private final int YY_E_INTERNAL = 0;
	private final int YY_E_MATCH = 1;
	private java.lang.String yy_error_string[] = {
		"Error: Internal error.\n",
		"Error: Unmatched input.\n"
	};
	private void yy_error (int code,boolean fatal) {
		java.lang.System.out.print(yy_error_string[code]);
		java.lang.System.out.flush();
		if (fatal) {
			throw new Error("Fatal Error.\n");
		}
	}
	static private int[][] unpackFromString(int size1, int size2, String st) {
		int colonIndex = -1;
		String lengthString;
		int sequenceLength = 0;
		int sequenceInteger = 0;

		int commaIndex;
		String workString;

		int res[][] = new int[size1][size2];
		for (int i= 0; i < size1; i++) {
			for (int j= 0; j < size2; j++) {
				if (sequenceLength != 0) {
					res[i][j] = sequenceInteger;
					sequenceLength--;
					continue;
				}
				commaIndex = st.indexOf(',');
				workString = (commaIndex==-1) ? st :
					st.substring(0, commaIndex);
				st = st.substring(commaIndex+1);
				colonIndex = workString.indexOf(':');
				if (colonIndex == -1) {
					res[i][j]=Integer.parseInt(workString);
					continue;
				}
				lengthString =
					workString.substring(colonIndex+1);
				sequenceLength=Integer.parseInt(lengthString);
				workString=workString.substring(0,colonIndex);
				sequenceInteger=Integer.parseInt(workString);
				res[i][j] = sequenceInteger;
				sequenceLength--;
			}
		}
		return res;
	}
	private int yy_acpt[] = {
		/* 0 */ YY_NOT_ACCEPT,
		/* 1 */ YY_NO_ANCHOR,
		/* 2 */ YY_NO_ANCHOR,
		/* 3 */ YY_NO_ANCHOR,
		/* 4 */ YY_NO_ANCHOR,
		/* 5 */ YY_NO_ANCHOR,
		/* 6 */ YY_NO_ANCHOR,
		/* 7 */ YY_NO_ANCHOR,
		/* 8 */ YY_NO_ANCHOR,
		/* 9 */ YY_NO_ANCHOR,
		/* 10 */ YY_NO_ANCHOR,
		/* 11 */ YY_NO_ANCHOR,
		/* 12 */ YY_NO_ANCHOR,
		/* 13 */ YY_NO_ANCHOR,
		/* 14 */ YY_NO_ANCHOR,
		/* 15 */ YY_NO_ANCHOR,
		/* 16 */ YY_NO_ANCHOR,
		/* 17 */ YY_NO_ANCHOR,
		/* 18 */ YY_NO_ANCHOR,
		/* 19 */ YY_NO_ANCHOR,
		/* 20 */ YY_NO_ANCHOR,
		/* 21 */ YY_NO_ANCHOR,
		/* 22 */ YY_NO_ANCHOR,
		/* 23 */ YY_NO_ANCHOR,
		/* 24 */ YY_NO_ANCHOR,
		/* 25 */ YY_NO_ANCHOR,
		/* 26 */ YY_NO_ANCHOR,
		/* 27 */ YY_NO_ANCHOR,
		/* 28 */ YY_NO_ANCHOR,
		/* 29 */ YY_NO_ANCHOR,
		/* 30 */ YY_NO_ANCHOR,
		/* 31 */ YY_NO_ANCHOR,
		/* 32 */ YY_NO_ANCHOR,
		/* 33 */ YY_NO_ANCHOR,
		/* 34 */ YY_NO_ANCHOR,
		/* 35 */ YY_NO_ANCHOR,
		/* 36 */ YY_NO_ANCHOR,
		/* 37 */ YY_NO_ANCHOR,
		/* 38 */ YY_NO_ANCHOR,
		/* 39 */ YY_NO_ANCHOR,
		/* 40 */ YY_NO_ANCHOR,
		/* 41 */ YY_NO_ANCHOR,
		/* 42 */ YY_NO_ANCHOR,
		/* 43 */ YY_NO_ANCHOR,
		/* 44 */ YY_NO_ANCHOR,
		/* 45 */ YY_NO_ANCHOR,
		/* 46 */ YY_NO_ANCHOR,
		/* 47 */ YY_NO_ANCHOR,
		/* 48 */ YY_NO_ANCHOR,
		/* 49 */ YY_NO_ANCHOR,
		/* 50 */ YY_NO_ANCHOR,
		/* 51 */ YY_NO_ANCHOR,
		/* 52 */ YY_NO_ANCHOR,
		/* 53 */ YY_NO_ANCHOR,
		/* 54 */ YY_NO_ANCHOR,
		/* 55 */ YY_NO_ANCHOR,
		/* 56 */ YY_NO_ANCHOR,
		/* 57 */ YY_NO_ANCHOR,
		/* 58 */ YY_NO_ANCHOR,
		/* 59 */ YY_NO_ANCHOR,
		/* 60 */ YY_NO_ANCHOR,
		/* 61 */ YY_NO_ANCHOR,
		/* 62 */ YY_NO_ANCHOR,
		/* 63 */ YY_NO_ANCHOR,
		/* 64 */ YY_NOT_ACCEPT,
		/* 65 */ YY_NO_ANCHOR,
		/* 66 */ YY_NO_ANCHOR,
		/* 67 */ YY_NO_ANCHOR,
		/* 68 */ YY_NO_ANCHOR,
		/* 69 */ YY_NOT_ACCEPT,
		/* 70 */ YY_NO_ANCHOR,
		/* 71 */ YY_NO_ANCHOR,
		/* 72 */ YY_NOT_ACCEPT,
		/* 73 */ YY_NO_ANCHOR,
		/* 74 */ YY_NO_ANCHOR,
		/* 75 */ YY_NOT_ACCEPT,
		/* 76 */ YY_NO_ANCHOR,
		/* 77 */ YY_NO_ANCHOR,
		/* 78 */ YY_NOT_ACCEPT,
		/* 79 */ YY_NO_ANCHOR,
		/* 80 */ YY_NOT_ACCEPT,
		/* 81 */ YY_NO_ANCHOR,
		/* 82 */ YY_NOT_ACCEPT,
		/* 83 */ YY_NO_ANCHOR,
		/* 84 */ YY_NOT_ACCEPT,
		/* 85 */ YY_NO_ANCHOR,
		/* 86 */ YY_NOT_ACCEPT,
		/* 87 */ YY_NO_ANCHOR,
		/* 88 */ YY_NOT_ACCEPT,
		/* 89 */ YY_NO_ANCHOR,
		/* 90 */ YY_NOT_ACCEPT,
		/* 91 */ YY_NO_ANCHOR,
		/* 92 */ YY_NOT_ACCEPT,
		/* 93 */ YY_NO_ANCHOR,
		/* 94 */ YY_NOT_ACCEPT,
		/* 95 */ YY_NO_ANCHOR,
		/* 96 */ YY_NOT_ACCEPT,
		/* 97 */ YY_NO_ANCHOR,
		/* 98 */ YY_NOT_ACCEPT,
		/* 99 */ YY_NO_ANCHOR,
		/* 100 */ YY_NOT_ACCEPT,
		/* 101 */ YY_NO_ANCHOR,
		/* 102 */ YY_NOT_ACCEPT,
		/* 103 */ YY_NO_ANCHOR,
		/* 104 */ YY_NOT_ACCEPT,
		/* 105 */ YY_NO_ANCHOR,
		/* 106 */ YY_NOT_ACCEPT,