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
|
package bjc.pratt.blocks;
import java.util.function.Predicate;
import java.util.function.UnaryOperator;
import bjc.pratt.ParseBlock;
import bjc.pratt.Token;
import bjc.utils.data.ITree;
/**
* Utility class for creating common implementations of {@link ParseBlock}
*
* @author bjculkin
*
*/
public class ParseBlocks {
/*
* Grammar parse blocks are complex enough to not get a builder method.
*/
/**
* Create a new repeating parse block.
*
* @param inner
* The parse block to repeat.
*
* @param delim
* The token type that separates repetitions.
*
* @param term
* The token type that terminates repetitions.
*
* @param mark
* The token to use as the node in the AST.
*
* @param action
* The action to perform on the state after every
* repetition.
*
* @return A configured repeating parse block.
*/
public static <K, V, C> ParseBlock<K, V, C> repeating(final ParseBlock<K, V, C> inner, final K delim,
final K term, final Token<K, V> mark, final UnaryOperator<C> action) {
return new RepeatingParseBlock<>(inner, delim, term, mark, action);
}
/**
* Create a new triggered parse block.
*
* @param source
* The block to trigger around.
*
* @param onEnter
* The action to perform upon the state before entering
* the block.
*
* @param onExit
* The action to perform upon the state after exiting the
* block.
*
* @return A configured trigger parse block.
*/
public static <K, V, C> ParseBlock<K, V, C> trigger(final ParseBlock<K, V, C> source,
final UnaryOperator<C> onEnter, final UnaryOperator<C> onExit) {
return new TriggeredParseBlock<>(onEnter, onExit, source);
}
/**
* Create a new simple parse block.
*
* @param precedence
* The precedence of the expression inside the block.
*
* @param terminator
* The key type of the token expected after this block,
* or null if none is expected.
*
* @param validator
* The predicate to use to validate parsed expressions,
* or null if none is used.
*
* @return A configured simple parse block.
*/
public static <K, V, C> ParseBlock<K, V, C> simple(final int precedence, final K terminator,
final Predicate<ITree<Token<K, V>>> validator) {
return new SimpleParseBlock<>(precedence, validator, terminator);
}
}
|
