1 |
|
/****************************************************************************** |
2 |
|
* Top contributors (to current version): |
3 |
|
* Andrew Reynolds |
4 |
|
* |
5 |
|
* This file is part of the cvc5 project. |
6 |
|
* |
7 |
|
* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS |
8 |
|
* in the top-level source directory and their institutional affiliations. |
9 |
|
* All rights reserved. See the file COPYING in the top-level source |
10 |
|
* directory for licensing information. |
11 |
|
* **************************************************************************** |
12 |
|
* |
13 |
|
* Simple substitution utility. |
14 |
|
*/ |
15 |
|
|
16 |
|
#ifndef CVC5__EXPR__SUBS_H |
17 |
|
#define CVC5__EXPR__SUBS_H |
18 |
|
|
19 |
|
#include <map> |
20 |
|
#include <vector> |
21 |
|
#include "expr/node.h" |
22 |
|
|
23 |
|
namespace cvc5 { |
24 |
|
|
25 |
|
/** |
26 |
|
* Helper substitution class. Stores a substitution in parallel vectors |
27 |
|
* d_vars and d_subs, both of which may be arbitrary terms, having the same |
28 |
|
* types pairwise. |
29 |
|
* |
30 |
|
* Notice this class applies substitutions using Node::substitute. Furthermore, |
31 |
|
* it does not insist that the terms in d_vars are unique. |
32 |
|
*/ |
33 |
4582 |
class Subs |
34 |
|
{ |
35 |
|
public: |
36 |
|
/** Is the substitution empty? */ |
37 |
|
bool empty() const; |
38 |
|
/** The size of the substitution */ |
39 |
|
size_t size() const; |
40 |
|
/** Does the substitution contain v? */ |
41 |
|
bool contains(Node v) const; |
42 |
|
/** Get the substitution for v if it exists, or null otherwise */ |
43 |
|
Node getSubs(Node v) const; |
44 |
|
/** Add v -> k for fresh skolem of the same type as v */ |
45 |
|
void add(Node v); |
46 |
|
/** Add v -> k for fresh skolem of the same type as v for each v in vs */ |
47 |
|
void add(const std::vector<Node>& vs); |
48 |
|
/** Add v -> s to the substitution */ |
49 |
|
void add(Node v, Node s); |
50 |
|
/** Add vs -> ss to the substitution */ |
51 |
|
void add(const std::vector<Node>& vs, const std::vector<Node>& ss); |
52 |
|
/** Add eq[0] -> eq[1] to the substitution */ |
53 |
|
void addEquality(Node eq); |
54 |
|
/** Append the substitution s to this */ |
55 |
|
void append(Subs& s); |
56 |
|
/** Return the result of this substitution on n */ |
57 |
|
Node apply(Node n, bool doRewrite = false) const; |
58 |
|
/** Return the result of the reverse of this substitution on n */ |
59 |
|
Node rapply(Node n, bool doRewrite = false) const; |
60 |
|
/** Apply this substitution to all nodes in the range of s */ |
61 |
|
void applyToRange(Subs& s, bool doRewrite = false) const; |
62 |
|
/** Apply the reverse of this substitution to all nodes in the range of s */ |
63 |
|
void rapplyToRange(Subs& s, bool doRewrite = false) const; |
64 |
|
/** Get equality (= v s) where v -> s is the i^th position in the vectors */ |
65 |
|
Node getEquality(size_t i) const; |
66 |
|
/** Convert substitution to map */ |
67 |
|
std::map<Node, Node> toMap() const; |
68 |
|
/** Get string for this substitution */ |
69 |
|
std::string toString() const; |
70 |
|
/** clear the substitution */ |
71 |
|
void clear(); |
72 |
|
/** The data */ |
73 |
|
std::vector<Node> d_vars; |
74 |
|
std::vector<Node> d_subs; |
75 |
|
}; |
76 |
|
|
77 |
|
/** |
78 |
|
* Serializes a given substitution to the given stream. |
79 |
|
* |
80 |
|
* @param out the output stream to use |
81 |
|
* @param s the substitution to output to the stream |
82 |
|
* @return the stream |
83 |
|
*/ |
84 |
|
std::ostream& operator<<(std::ostream& out, const Subs& s); |
85 |
|
|
86 |
|
} // namespace cvc5 |
87 |
|
|
88 |
|
#endif /* CVC5__EXPR__SUBS_H */ |