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romainfrancoisromainfrancois
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added const_string_proxy
1 parent 673ef16 commit f5e1600

9 files changed

Lines changed: 222 additions & 56 deletions

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‎inst/include/Rcpp/String.h‎

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Original file line numberDiff line numberDiff line change
@@ -50,6 +50,7 @@ namespace Rcpp {
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class String {
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public:
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typedef internal::string_proxy<STRSXP> StringProxy;
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typedef internal::const_string_proxy<STRSXP> const_StringProxy;
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/** default constructor */
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String( ): data( Rf_mkChar("") ), buffer(), valid(true), buffer_ready(true) {
@@ -70,6 +71,11 @@ namespace Rcpp {
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String( const StringProxy& proxy ): data( proxy.get() ), valid(true), buffer_ready(false){
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RCPP_STRING_DEBUG( "String( const StringProxy&)" ) ;
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}
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/** from string proxy */
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String( const const_StringProxy& proxy ): data( proxy.get() ), valid(true), buffer_ready(false){
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RCPP_STRING_DEBUG( "String( const const_StringProxy&)" ) ;
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}
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/** from a std::string */
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String( const std::string& s) : buffer(s), valid(false), buffer_ready(true) {

‎inst/include/Rcpp/Vector.h‎

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@@ -62,6 +62,7 @@ template <int RTYPE> class SubMatrix ;
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}
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#include <Rcpp/vector/string_proxy.h>
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#include <Rcpp/vector/const_string_proxy.h>
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#include <Rcpp/vector/generic_proxy.h>
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#include <Rcpp/String.h>

‎inst/include/Rcpp/vector/00_forward_proxy.h‎

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@@ -23,6 +23,7 @@
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namespace internal{
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template <int RTYPE> class string_proxy ;
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template <int RTYPE> class const_string_proxy ;
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template <int RTYPE> class generic_proxy ;
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template <int RTYPE> class simple_name_proxy ;
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template <int RTYPE> class string_name_proxy ;

‎inst/include/Rcpp/vector/const_string_proxy.h‎

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@@ -0,0 +1,159 @@
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// Copyright (C) 2013 Romain Francois
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//
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// This file is part of Rcpp11.
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//
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// Rcpp11 is free software: you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 2 of the License, or
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// (at your option) any later version.
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//
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// Rcpp11 is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Rcpp11. If not, see <http://www.gnu.org/licenses/>.
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#ifndef Rcpp__vector__const_string_proxy_h
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#define Rcpp__vector__const_string_proxy_h
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namespace Rcpp{
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namespace internal{
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24+
template<int RTYPE> class const_string_proxy {
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public:
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typedef typename Rcpp::Vector<RTYPE> VECTOR ;
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const_string_proxy() : parent(0), index(-1){};
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/**
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* Creates a proxy
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*
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* @param v reference to the associated character vector
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* @param index index
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*/
37+
const_string_proxy( const VECTOR& v, int index_ ) : parent(&v), index(index_) {
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RCPP_DEBUG( "const_string_proxy( VECTOR& = <%p>, index_ = %d) ", v.asSexp(), index_ ) ;
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}
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const_string_proxy( const const_string_proxy& other ) : parent(other.parent), index(other.index){} ;
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43+
const_string_proxy& operator=( const const_string_proxy& ) = delete ;
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void import( const const_string_proxy& other){
46+
parent = other.parent ;
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index = other.index ;
48+
}
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/**
51+
* rhs use. Retrieves the current value of the
52+
* element this proxy refers to.
53+
*/
54+
operator SEXP() const {
55+
return get() ;
56+
}
57+
58+
/**
59+
* rhs use. Retrieves the current value of the
60+
* element this proxy refers to and convert it to a
61+
* C string
62+
*/
63+
operator /* const */ char*() const {
64+
return const_cast<char*>( CHAR(get()) );
65+
}
66+
67+
68+
/**
69+
* Prints the element this proxy refers to to an
70+
* output stream
71+
*/
72+
template <int RT>
73+
friend std::ostream& operator<<(std::ostream& os, const const_string_proxy<RT>& proxy);
74+
75+
template <int RT>
76+
friend std::string operator+( const std::string& x, const const_string_proxy<RT>& proxy);
77+
78+
const VECTOR* parent;
79+
int index ;
80+
inline void move( int n ){ index += n ;}
81+
82+
inline SEXP get() const {
83+
return STRING_ELT( *parent, index ) ;
84+
}
85+
86+
inline int size() const { return strlen( begin() ) ; }
87+
bool operator==( const char* other){
88+
return strcmp( begin(), other ) == 0 ;
89+
}
90+
bool operator!=( const char* other){
91+
return strcmp( begin(), other ) != 0 ;
92+
}
93+
94+
bool operator==( const const_string_proxy& other){
95+
return strcmp( begin(), other.begin() ) == 0 ;
96+
}
97+
bool operator!=( const const_string_proxy& other){
98+
return strcmp( begin(), other.begin() ) != 0 ;
99+
}
100+
101+
102+
private:
103+
typedef const char* iterator ;
104+
typedef const char& reference ;
105+
106+
inline iterator begin() const { return CHAR( STRING_ELT( *parent, index ) ) ; }
107+
inline iterator end() const { return begin() + size() ; }
108+
109+
static std::string buffer ;
110+
111+
} ;
112+
113+
template <int RT>
114+
bool operator<( const const_string_proxy<RT>& lhs, const const_string_proxy<RT>& rhs) {
115+
return strcmp(
116+
const_cast<char *>(lhs.begin() ),
117+
const_cast<char *>(rhs.begin())
118+
) < 0 ;
119+
}
120+
121+
template <int RT>
122+
bool operator>( const const_string_proxy<RT>& lhs, const const_string_proxy<RT>& rhs) {
123+
return strcmp(
124+
const_cast<char *>(lhs.begin() ),
125+
const_cast<char *>(rhs.begin())
126+
) > 0 ;
127+
}
128+
129+
template <int RT>
130+
bool operator>=( const const_string_proxy<RT>& lhs, const const_string_proxy<RT>& rhs) {
131+
return strcmp(
132+
const_cast<char *>(lhs.begin() ),
133+
const_cast<char *>(rhs.begin())
134+
) >= 0 ;
135+
}
136+
137+
template <int RT>
138+
bool operator<=( const const_string_proxy<RT>& lhs, const const_string_proxy<RT>& rhs) {
139+
return strcmp(
140+
const_cast<char *>(lhs.begin() ),
141+
const_cast<char *>(rhs.begin())
142+
) <= 0 ;
143+
}
144+
145+
template<int RTYPE> std::string const_string_proxy<RTYPE>::buffer ;
146+
147+
inline std::ostream& operator<<(std::ostream& os, const const_string_proxy<STRSXP>& proxy) {
148+
os << static_cast<char*>(proxy) ;
149+
return os;
150+
}
151+
152+
inline std::string operator+( const std::string& x, const const_string_proxy<STRSXP>& y ){
153+
return x + static_cast<const char*>(y) ;
154+
}
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}
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}
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159+
#endif

‎inst/include/Rcpp/vector/proxy.h‎

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -228,9 +228,9 @@ namespace traits {
228228
struct r_vector_const_proxy{
229229
typedef const typename storage_type<RTYPE>::type& type ;
230230
} ;
231-
// template<> struct r_vector_const_proxy<STRSXP> {
232-
// typedef ::Rcpp::internal::const_string_proxy<STRSXP> type ;
233-
// } ;
231+
template<> struct r_vector_const_proxy<STRSXP> {
232+
typedef ::Rcpp::internal::const_string_proxy<STRSXP> type ;
233+
} ;
234234
// template<> struct r_vector_const_proxy<EXPRSXP> {
235235
// typedef ::Rcpp::internal::const_generic_proxy<EXPRSXP> type ;
236236
// } ;

‎inst/include/Rcpp/vector/string_proxy.h‎

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Original file line numberDiff line numberDiff line change
@@ -84,7 +84,6 @@ namespace internal{
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8585

8686
string_proxy& operator=(SEXP rhs){
87-
// TODO: check this is a CHARSXP
8887
set( rhs ) ;
8988
return *this ;
9089
}
@@ -152,25 +151,6 @@ namespace internal{
152151
}
153152

154153
inline int size() const { return strlen( begin() ) ; }
155-
// inline reference operator[]( int n ){ return *( begin() + n ) ; }
156-
//
157-
// template <typename UnaryOperator>
158-
// void transform( UnaryOperator op ){
159-
// buffer = begin() ;
160-
// std::transform( buffer.begin(), buffer.end(), buffer.begin(), op ) ;
161-
// set( buffer ) ;
162-
// }
163-
//
164-
// template <typename OutputIterator, typename UnaryOperator>
165-
// void apply( OutputIterator target, UnaryOperator op){
166-
// std::transform( begin(), end(), target, op ) ;
167-
// }
168-
//
169-
// template <typename UnaryOperator>
170-
// void apply( UnaryOperator op){
171-
// std::for_each( begin(), end(), op );
172-
// }
173-
174154
bool operator==( const char* other){
175155
return strcmp( begin(), other ) == 0 ;
176156
}

‎inst/include/Rcpp/vector/traits.h‎

Lines changed: 2 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -72,10 +72,8 @@ namespace traits{
7272
inline proxy ref() { return proxy(*p,0) ; }
7373
inline proxy ref(int i) { return proxy(*p,i);}
7474

75-
// inline const_proxy ref() const { return const_proxy(*p,0) ; }
76-
// inline const_proxy ref(int i) const { return const_proxy(*p,i);}
77-
inline const_proxy ref() const { return *get_vector_ptr(*p) ; }
78-
inline const_proxy ref(int i) const { return get_vector_ptr(*p)[i] ;}
75+
inline const_proxy ref() const { return const_proxy(*p,0) ; }
76+
inline const_proxy ref(int i) const { return const_proxy(*p,i);}
7977

8078
private:
8179
VECTOR* p ;

‎inst/unitTests/cpp/String.cpp‎

Lines changed: 35 additions & 24 deletions
Original file line numberDiff line numberDiff line change
@@ -18,30 +18,29 @@ String String_replace_last( String z, String x, String y){
1818
return z ;
1919
}
2020

21-
class StringConv{
22-
public:
23-
// typedef String result_type ;
24-
StringConv( CharacterVector old_, CharacterVector new__):
25-
nr(old_.size()), old(old_), new_(new__){}
26-
27-
String operator()(String text) const {
28-
for( int i=0; i<nr; i++){
29-
text.replace_all( old[i], new_[i] ) ;
30-
}
31-
return text ;
32-
}
33-
34-
private:
35-
int nr ;
36-
CharacterVector old ;
37-
CharacterVector new_ ;
38-
} ;
39-
40-
// [[Rcpp::export]]
41-
CharacterVector test_sapply_string( CharacterVector text, CharacterVector old , CharacterVector new_){
42-
CharacterVector res = sapply( text, StringConv( old, new_ ) ) ;
43-
return res ;
44-
}
21+
// class StringConv{
22+
// public:
23+
// // typedef String result_type ;
24+
// StringConv( const CharacterVector& old_, const CharacterVector& new__): nr(old_.size()), old(old_), new_(new__){}
25+
//
26+
// String operator()(String text) const {
27+
// for( int i=0; i<nr; i++){
28+
// text.replace_all( old[i], new_[i] ) ;
29+
// }
30+
// return text ;
31+
// }
32+
//
33+
// private:
34+
// int nr ;
35+
// const CharacterVector& old ;
36+
// const CharacterVector& new_ ;
37+
// } ;
38+
//
39+
// // [[Rcpp::export]]
40+
// CharacterVector test_sapply_string( CharacterVector text, CharacterVector old , CharacterVector new_){
41+
// CharacterVector res = sapply( text, StringConv( old, new_ ) ) ;
42+
// return res ;
43+
// }
4544

4645
// [[Rcpp::export]]
4746
List test_compare_Strings( String aa, String bb ){
@@ -53,3 +52,15 @@ List test_compare_Strings( String aa, String bb ){
5352
) ;
5453
}
5554

55+
// [[Rcpp::export]]
56+
String string_proxy_char_conversion( CharacterVector& x){
57+
const char* s = x[0] ;
58+
return String(s) ;
59+
}
60+
61+
// [[Rcpp::export]]
62+
String const_string_proxy_char_conversion( const CharacterVector& x){
63+
const char* s = x[0] ;
64+
return String(s) ;
65+
}
66+

‎inst/unitTests/runit.String.R‎

Lines changed: 15 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
11
#!/usr/bin/r -t
22
#
33
# Copyright (C) 2012 Dirk Eddelbuettel and Romain Francois
4+
# Copyright (C) 2013 Romain Francois
45
#
56
# This file is part of Rcpp11.
67
#
@@ -33,10 +34,10 @@ test.replace_last <- function(){
3334
checkEquals( String_replace_last("foobar", "o", "*"), "fo*bar")
3435
}
3536

36-
test.String.sapply <- function(){
37-
res <- test_sapply_string( "foobar", c("o", "a" ), c("*", "!" ) )
38-
checkEquals( res, "f**b!r" )
39-
}
37+
# test.String.sapply <- function(){
38+
# res <- test_sapply_string( "foobar", c("o", "a" ), c("*", "!" ) )
39+
# checkEquals( res, "f**b!r" )
40+
# }
4041

4142
test.compare.Strings <- function(){
4243
res <- test_compare_Strings( "aaa", "aab" )
@@ -48,5 +49,14 @@ test.compare.Strings <- function(){
4849
)
4950
checkEquals( res, target )
5051
}
51-
52+
53+
test.string_proxy_char_conversion <- function(){
54+
res <- string_proxy_char_conversion( "foo" )
55+
checkEquals(res, "foo")
56+
57+
res <- const_string_proxy_char_conversion( "foo" )
58+
checkEquals(res, "foo")
59+
60+
}
61+
5262
}

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