/Users/eugenesiegel/btc/bitcoin/src/script/parsing.cpp
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1 | | // Copyright (c) 2018-present The Bitcoin Core developers |
2 | | // Distributed under the MIT software license, see the accompanying |
3 | | // file COPYING or http://www.opensource.org/licenses/mit-license.php. |
4 | | |
5 | | #include <script/parsing.h> |
6 | | |
7 | | #include <span.h> |
8 | | |
9 | | #include <algorithm> |
10 | | #include <cstddef> |
11 | | #include <string> |
12 | | |
13 | | namespace script { |
14 | | |
15 | | bool Const(const std::string& str, std::span<const char>& sp, bool skip) |
16 | 0 | { |
17 | 0 | if ((size_t)sp.size() >= str.size() && std::equal(str.begin(), str.end(), sp.begin())) { |
18 | 0 | if (skip) sp = sp.subspan(str.size()); |
19 | 0 | return true; |
20 | 0 | } |
21 | 0 | return false; |
22 | 0 | } |
23 | | |
24 | | bool Func(const std::string& str, std::span<const char>& sp) |
25 | 0 | { |
26 | 0 | if ((size_t)sp.size() >= str.size() + 2 && sp[str.size()] == '(' && sp[sp.size() - 1] == ')' && std::equal(str.begin(), str.end(), sp.begin())) { |
27 | 0 | sp = sp.subspan(str.size() + 1, sp.size() - str.size() - 2); |
28 | 0 | return true; |
29 | 0 | } |
30 | 0 | return false; |
31 | 0 | } |
32 | | |
33 | | std::span<const char> Expr(std::span<const char>& sp) |
34 | 0 | { |
35 | 0 | int level = 0; |
36 | 0 | auto it = sp.begin(); |
37 | 0 | while (it != sp.end()) { |
38 | 0 | if (*it == '(' || *it == '{') { |
39 | 0 | ++level; |
40 | 0 | } else if (level && (*it == ')' || *it == '}')) { |
41 | 0 | --level; |
42 | 0 | } else if (level == 0 && (*it == ')' || *it == '}' || *it == ',')) { |
43 | 0 | break; |
44 | 0 | } |
45 | 0 | ++it; |
46 | 0 | } |
47 | 0 | std::span<const char> ret = sp.first(it - sp.begin()); |
48 | 0 | sp = sp.subspan(it - sp.begin()); |
49 | 0 | return ret; |
50 | 0 | } |
51 | | |
52 | | } // namespace script |