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
|
package com.ashardalon.pratt.commands.impls;
import java.util.Set;
import com.ashardalon.pratt.ParserContext;
import com.ashardalon.pratt.commands.BinaryPostCommand;
import com.ashardalon.pratt.commands.CommandResult;
import com.ashardalon.pratt.commands.CommandResult.Status;
import com.ashardalon.pratt.tokens.Token;
import bjc.data.Tree;
import bjc.data.SimpleTree;
import bjc.utils.parserutils.ParserException;
/**
* Create a new chained operator.
*
* @author bjculkin
*
* @param <K>
* The key type of the tokens.
*
* @param <V>
* The value type of the tokens.
*
* @param <C>
* The state type of the parser.
*/
public class ChainCommand<K, V, C> extends BinaryPostCommand<K, V, C> {
private final Set<K> chainWith;
private final Token<K, V> chain;
/**
* Create a new chained operator.
*
* @param precedence
* The precedence of this operator.
*
* @param chainSet
* The operators to chain with.
*
* @param chainMarker
* The token to use as the node in the AST.
*/
public ChainCommand(final int precedence, final Set<K> chainSet, final Token<K, V> chainMarker) {
super(precedence);
chainWith = chainSet;
chain = chainMarker;
}
@Override
public CommandResult<K, V> denote(final Tree<Token<K, V>> operand, final Token<K, V> operator,
final ParserContext<K, V, C> ctx) throws ParserException {
CommandResult<K, V> resOuter = ctx.parse.parseExpression(1 + leftBinding(), ctx.tokens, ctx.state,
false);
if (resOuter.status != Status.SUCCESS) return resOuter;
final Tree<Token<K, V>> tree = resOuter.success();
final Tree<Token<K, V>> res = new SimpleTree<>(operator, operand, tree);
if(chainWith.contains(ctx.tokens.current().getKey())) {
final Token<K, V> tok = ctx.tokens.current();
ctx.tokens.next();
CommandResult<K, V> resOther = denote(tree, tok,
new ParserContext<>(ctx.tokens, ctx.parse, ctx.state));
if (resOther.status != Status.SUCCESS) return resOther;
final Tree<Token<K, V>> other = resOther.success();
return CommandResult.success(new SimpleTree<>(chain, res, other));
}
return CommandResult.success(res);
}
@Override
public int nextBinding() {
return leftBinding() - 1;
}
}
|
