1 /*
2 * Conditions Of Use
3 *
4 * This software was developed by employees of the National Institute of
5 * Standards and Technology (NIST), an agency of the Federal Government.
6 * Pursuant to title 15 Untied States Code Section 105, works of NIST
7 * employees are not subject to copyright protection in the United States
8 * and are considered to be in the public domain.  As a result, a formal
9 * license is not needed to use the software.
10 *
11 * This software is provided by NIST as a service and is expressly
12 * provided "AS IS."  NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
13 * OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
14 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
15 * AND DATA ACCURACY.  NIST does not warrant or make any representations
16 * regarding the use of the software or the results thereof, including but
17 * not limited to the correctness, accuracy, reliability or usefulness of
18 * the software.
19 *
20 * Permission to use this software is contingent upon your acceptance
21 * of the terms of this agreement
22 *
23 * .
24 *
25 */
26 package gov.nist.core;
27 
28 import java.text.ParseException;
29 
30 /** Generic parser class.
31 * All parsers inherit this class.
32 *
33 *@version 1.2
34 *
35 *@author M. Ranganathan   <br/>
36 *
37 *
38 *
39 */
40 public abstract class ParserCore {
41     public static final boolean debug = Debug.parserDebug;
42 
43     static int nesting_level;
44 
45     protected LexerCore lexer;
46 
47 
nameValue(char separator)48     protected NameValue nameValue(char separator) throws ParseException  {
49         if (debug) dbg_enter("nameValue");
50         try {
51 
52         lexer.match(LexerCore.ID);
53         Token name = lexer.getNextToken();
54         // eat white space.
55         lexer.SPorHT();
56         try {
57 
58 
59                 boolean quoted = false;
60 
61             char la = lexer.lookAhead(0);
62 
63             if (la == separator ) {
64                 lexer.consume(1);
65                 lexer.SPorHT();
66                 String str = null;
67                 boolean isFlag = false;
68                 if (lexer.lookAhead(0) == '\"')  {
69                      str = lexer.quotedString();
70                      quoted = true;
71                 } else {
72                    lexer.match(LexerCore.ID);
73                    Token value = lexer.getNextToken();
74                    str = value.tokenValue;
75 
76                    // JvB: flag parameters must be empty string!
77                    if (str==null) {
78                        str = "";
79                        isFlag = true;
80                    }
81                 }
82                 NameValue nv = new NameValue(name.tokenValue,str,isFlag);
83                 if (quoted) nv.setQuotedValue();
84                 return nv;
85             }  else {
86                 // JvB: flag parameters must be empty string!
87                 return new NameValue(name.tokenValue,"",true);
88             }
89         } catch (ParseException ex) {
90             return new NameValue(name.tokenValue,null,false);
91         }
92 
93         } finally {
94             if (debug) dbg_leave("nameValue");
95         }
96 
97 
98     }
99 
dbg_enter(String rule)100     protected  void dbg_enter(String rule) {
101         StringBuffer stringBuffer = new StringBuffer();
102         for (int i = 0; i < nesting_level ; i++)
103             stringBuffer.append(">");
104 
105         if (debug)  {
106             System.out.println(
107                 stringBuffer + rule +
108                 "\nlexer buffer = \n" +
109                 lexer.getRest());
110         }
111         nesting_level++;
112     }
113 
dbg_leave(String rule)114     protected void dbg_leave(String rule) {
115         StringBuffer stringBuffer = new StringBuffer();
116         for (int i = 0; i < nesting_level ; i++)
117             stringBuffer.append("<");
118 
119         if (debug)  {
120             System.out.println(
121                 stringBuffer +
122                 rule +
123                 "\nlexer buffer = \n" +
124                 lexer.getRest());
125         }
126         nesting_level --;
127     }
128 
nameValue()129     protected NameValue nameValue() throws ParseException  {
130         return nameValue('=');
131     }
132 
133 
134 
peekLine(String rule)135     protected void peekLine(String rule) {
136         if (debug) {
137             Debug.println(rule +" " + lexer.peekLine());
138         }
139     }
140 }
141 
142 
143