1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
package bjc.rgens.parser.elements;
import bjc.rgens.parser.GenerationState;
import bjc.rgens.parser.GrammarException;
/**
* A element in a rule case.
*
* @author EVE
*/
public abstract class CaseElement {
/**
* The possible types of an element.
*
* @author EVE
*/
public static enum ElementType {
/** An element that represents a literal string. */
LITERAL(true),
/** An element that represents a rule reference. */
RULEREF(true),
/** An element that represents a random range. */
RANGE(true),
/** An element that represents a variable that stores a string. */
VARIABLE(false);
public final boolean spacing;
private ElementType(boolean spacing) {
this.spacing = spacing;
}
}
/** The type of this element. */
public final ElementType type;
/**
* Create a new case element.
*
* @param typ
* The type of this element.
*/
protected CaseElement(ElementType typ) {
type = typ;
}
@Override
public String toString() {
return String.format("Unknown type '%s'", type);
}
/**
* Generate this case element.
*
* @param state
* The current state of generation.
*/
public abstract void generate(GenerationState state);
/**
* Create a case element from a string.
*
* @param csepart
* The string to convert.
*
* @return A case element representing the string.
*/
public static CaseElement createElement(String csepart) {
if (csepart == null) {
throw new NullPointerException("Case part cannot be null");
}
if (csepart.matches("\\{[^}]+\\}")) {
/*
* Handle special case elements.
*
*/
String specialBody = csepart.substring(1, csepart.length() - 1);
//System.out.printf("\t\tTRACE: special body is '%s'\n", specialBody);
if (specialBody.matches("\\$\\S+:=\\S+")) {
/* Handle expanding variable definitions. */
String[] parts = specialBody.split(":=");
if (parts.length != 2) {
String msg = "Expanded variables must be a name and a definition, seperated by :=";
throw new GrammarException(msg);
}
/* Trim $ */
return new ExpVariableCaseElement(parts[0].substring(1), parts[1]);
} else if (specialBody.matches("\\$\\S+=\\S+")) {
/* Handle regular variable definitions. */
String[] parts = specialBody.split("=");
if (parts.length != 2) {
String msg = "Variables must be a name and a definition, seperated by =";
throw new GrammarException(msg);
}
/* Trim $ */
return new LitVariableCaseElement(parts[0].substring(1), parts[1]);
} else if (specialBody.matches("\\@\\S+=\\S+")) {
/* Handle rule variable definitions. */
String[] parts = specialBody.split("=");
if (parts.length != 2) {
String msg = "Rule variables must be a name and a definition, seperated by =";
throw new GrammarException(msg);
}
/* Trim $ */
return new RuleVariableCaseElement(parts[0].substring(1), parts[1], false);
} else if (specialBody.matches("\\@\\S+:=\\S+")) {
/* Handle exhaustible rule variable definitions. */
String[] parts = specialBody.split("=");
if (parts.length != 2) {
String msg = "Rule variables must be a name and a definition, seperated by =";
throw new GrammarException(msg);
}
/* Trim $ */
return new RuleVariableCaseElement(parts[0].substring(1), parts[1], true);
} else if (specialBody.matches("empty")) {
/* Literal blank, for empty cases. */
return new BlankCaseElement();
} else {
throw new IllegalArgumentException(String.format("Unknown special case part '%s'", specialBody));
}
} else if (csepart.matches("\\[[^\\]]+\\]")) {
String rawCase = csepart.substring(1, csepart.length() - 1);
if (rawCase.matches("\\d+\\.\\.\\d+")) {
int firstNum = Integer.parseInt(rawCase.substring(0, rawCase.indexOf('.')));
int secondNum = Integer.parseInt(rawCase.substring(rawCase.lastIndexOf('.') + 1));
return new RangeCaseElement(firstNum, secondNum);
} else if(rawCase.contains("|")) {
String[] elms = rawCase.split("\\|");
System.err.printf("\tTRACE: Split inline cases %s to ", rawCase);
for(String elm : elms) {
System.err.printf("%s, ", elm);
}
System.err.println();
return new InlineRuleCaseElement(elms);
} else if(csepart.contains("$")) {
/*
* @NOTE
*
* Once the rule element execution has been refactored,
* pass rawCase instead.
*/
if(csepart.contains("-")) {
return new DependantRuleReference(csepart);
}
return new VariableRuleReference(csepart);
} else if(csepart.contains("@")) {
// Trim @
return new RuleVarRefCaseElement(csepart.substring(1));
} else {
return new NormalRuleReference(csepart);
}
} else if(csepart.startsWith("%")) {
String rName = String.format("[%s]", csepart.substring(1));
System.err.printf("\tTRACE: short ref to %s (%s)\n", rName, csepart);
return new NormalRuleReference(rName);
} else {
return new LiteralCaseElement(csepart);
}
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((type == null) ? 0 : type.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
CaseElement other = (CaseElement) obj;
if (type != other.type)
return false;
return true;
}
}
|
