blob: 7ce6f5d8cd1ca6b918a0eb2b98671d23c63b1231 (
plain)
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
|
package bjc.dicelang.v1.ast.optimization;
import bjc.dicelang.v1.ast.nodes.DiceASTType;
import bjc.dicelang.v1.ast.nodes.IDiceASTNode;
import bjc.dicelang.v1.ast.nodes.OperatorDiceNode;
import bjc.utils.data.IHolder;
import bjc.utils.data.ITree;
import bjc.utils.data.Identity;
import bjc.utils.data.TopDownTransformResult;
import bjc.utils.data.Tree;
/**
* Condenses chained operations into a single level
*
* @author ben
*
*/
public class OperationCondenser {
/**
* Condense chained similiar operations into a single level
*
* @param ast
* The AST to condense
* @return The condensed AST
*/
public static ITree<IDiceASTNode> condense(ITree<IDiceASTNode> ast) {
return ast.topDownTransform(OperationCondenser::pickNode, OperationCondenser::doCondense);
}
private static ITree<IDiceASTNode> doCondense(ITree<IDiceASTNode> ast) {
OperatorDiceNode operation = ast.transformHead((node) -> (OperatorDiceNode) node);
IHolder<Boolean> canCondense = new Identity<>(true);
ast.doForChildren((child) -> {
if(canCondense.getValue()) {
canCondense.replace(child.transformHead((node) -> {
if(node.getType() == DiceASTType.OPERATOR) {
if(operation.equals(node)) return true;
return false;
}
return true;
}));
}
});
if(!canCondense.getValue()) return ast;
ITree<IDiceASTNode> condensedAST = new Tree<>(operation);
ast.doForChildren((child) -> {
if(child.getHead().getType() == DiceASTType.OPERATOR) {
child.doForChildren((subChild) -> {
condensedAST.addChild(subChild);
});
} else {
condensedAST.addChild(child);
}
});
return condensedAST;
}
private static TopDownTransformResult pickNode(IDiceASTNode node) {
switch(node.getType()) {
case LITERAL:
return TopDownTransformResult.SKIP;
case OPERATOR:
return pickOperator((OperatorDiceNode) node);
case VARIABLE:
return TopDownTransformResult.SKIP;
default:
throw new UnsupportedOperationException("Attempted to traverse unknown node type " + node);
}
}
private static TopDownTransformResult pickOperator(OperatorDiceNode node) {
switch(node) {
case ADD:
case MULTIPLY:
case SUBTRACT:
case DIVIDE:
case COMPOUND:
return TopDownTransformResult.PUSHDOWN;
case ARRAY:
case ASSIGN:
case GROUP:
case LET:
return TopDownTransformResult.PASSTHROUGH;
default:
throw new UnsupportedOperationException("Attempted to traverse unknown operator " + node);
}
}
}
|
