RESTinio

std_regex_engine.hpp
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1/*
2 restinio
3*/
4
9#pragma once
10
11#include <regex>
12
13 namespace restinio
14{
15
16 namespace router
17{
18
19//
20// std_regex_engine_t
21//
22
24 struct std_regex_engine_t
25{
26 using compiled_regex_t = std::regex;
27 using match_results_t = std::vector< std::pair< std::size_t, size_t > >;
28 using matched_item_descriptor_t = match_results_t::value_type;
29
30 static constexpr std::size_t
31 max_capture_groups()
32 {
33 // The size of match results for standard regexes cannot be reserved
34 // and grows as needed, so no limits beforehand.
35 return std::numeric_limits< std::size_t >::max();
36 }
37
39 static auto
40 compile_regex(
42 string_view_t r,
44 bool is_case_sensative )
45 {
46 auto regex_flags = std::regex::ECMAScript;
47
48 if( !is_case_sensative )
49 {
50 regex_flags |= std::regex::icase;
51 }
52
53 return compiled_regex_t{ r.data(), r.size(), regex_flags };
54 }
55
57 static auto
58 try_match(
59 string_view_t target_path,
60 const compiled_regex_t & r,
61 match_results_t & match_results )
62 {
63 std::cmatch matches;
64 if(
65 std::regex_search(
66 target_path.data(),
67 target_path.data() + target_path.size(),
68 matches,
69 r ) )
70 {
71 std::transform(
72 matches.begin(),
73 matches.end(),
74 std::back_inserter( match_results ),
75 [ begin = target_path.data() ]( const auto & m ){
76 return matched_item_descriptor_t{ m.first - begin, m.second - begin };
77 } );
78
79 return true;
80 }
81 return false;
82 }
83
85 static auto
86 submatch_begin_pos( const matched_item_descriptor_t & m )
87 {
88 return m.first;
89 }
90
92 static auto
93 submatch_end_pos( const matched_item_descriptor_t & m )
94 {
95 return m.second;
96 }
97};
98
99} /* namespace router */
100
101} /* namespace restinio */
restinio::transforms::zlib::transform
std::string transform(string_view_t input, const params_t &params)
Do a specified zlib transformation.
Definition: zlib.hpp:878
restinio
Definition: asio_include.hpp:21
restinio::string_view_t
nonstd::string_view string_view_t
Definition: string_view.hpp:19
restinio::router::std_regex_engine_t
Regex engine implementation for using with standard regex implementation.
Definition: std_regex_engine.hpp:25
restinio::router::std_regex_engine_t::match_results_t
std::vector< std::pair< std::size_t, size_t > > match_results_t
Definition: std_regex_engine.hpp:27
restinio::router::std_regex_engine_t::submatch_end_pos
static auto submatch_end_pos(const matched_item_descriptor_t &m)
Get the end of a submatch.
Definition: std_regex_engine.hpp:93
restinio::router::std_regex_engine_t::matched_item_descriptor_t
match_results_t::value_type matched_item_descriptor_t
Definition: std_regex_engine.hpp:28
restinio::router::std_regex_engine_t::try_match
static auto try_match(string_view_t target_path, const compiled_regex_t &r, match_results_t &match_results)
Wrapper function for matching logic invokation.
Definition: std_regex_engine.hpp:58
restinio::router::std_regex_engine_t::compiled_regex_t
std::regex compiled_regex_t
Definition: std_regex_engine.hpp:26
restinio::router::std_regex_engine_t::submatch_begin_pos
static auto submatch_begin_pos(const matched_item_descriptor_t &m)
Get the beginning of a submatch.
Definition: std_regex_engine.hpp:86
restinio::router::std_regex_engine_t::compile_regex
static auto compile_regex(string_view_t r, bool is_case_sensative)
Create compiled regex object for a given route.
Definition: std_regex_engine.hpp:40
restinio::router::std_regex_engine_t::max_capture_groups
static constexpr std::size_t max_capture_groups()
Definition: std_regex_engine.hpp:31