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Merge pull request #680 from nathan-russell/feature/sugar-trimws
Sugar function 'trimws' with unit tests (closes #679)
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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; indent-tabs-mode: nil; -*- | ||
// | ||
// trimws.h: Rcpp R/C++ interface class library -- trimws | ||
// | ||
// Copyright (C) 2017 Nathan Russell | ||
// | ||
// This file is part of Rcpp. | ||
// | ||
// Rcpp is free software: you can redistribute it and/or modify it | ||
// under the terms of the GNU General Public License as published by | ||
// the Free Software Foundation, either version 2 of the License, or | ||
// (at your option) any later version. | ||
// | ||
// Rcpp is distributed in the hope that it will be useful, but | ||
// WITHOUT ANY WARRANTY; without even the implied warranty of | ||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
// GNU General Public License for more details. | ||
// | ||
// You should have received a copy of the GNU General Public License | ||
// along with Rcpp. If not, see <http://www.gnu.org/licenses/>. | ||
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#ifndef Rcpp__sugar__trimws_h | ||
#define Rcpp__sugar__trimws_h | ||
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#include <string> | ||
#include <cstring> | ||
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namespace Rcpp { | ||
namespace sugar { | ||
namespace detail { | ||
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/* NB: std::isspace is not used because it also counts | ||
'\f' and '\v' as whitespace, whereas base::trimws only | ||
checks for ' ', '\t', '\r', and '\n' */ | ||
inline bool isws(const char c) { | ||
return c == ' ' || c == '\t' || c == '\n' || c == '\r'; | ||
} | ||
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inline const char* trim_left(const char* str) { | ||
if (!str) { | ||
return ""; | ||
} | ||
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while (isws(*str)) { | ||
++str; | ||
} | ||
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return str; | ||
} | ||
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inline const char* trim_right(const char* str, R_len_t sz, std::string* buff) { | ||
if (!str) { | ||
return ""; | ||
} | ||
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buff->clear(); | ||
const char* ptr = str + sz - 1; | ||
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for (; ptr > str && isws(*ptr); --sz, --ptr); | ||
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buff->append(str, sz - isws(*ptr)); | ||
return buff->c_str(); | ||
} | ||
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inline const char* trim_both(const char* str, R_len_t sz, std::string* buff) { | ||
if (!str) { | ||
return ""; | ||
} | ||
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buff->clear(); | ||
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while (isws(*str)) { | ||
++str; --sz; | ||
} | ||
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const char* ptr = str + sz - 1; | ||
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for (; ptr > str && isws(*ptr); --sz, --ptr); | ||
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buff->append(str, sz); | ||
return buff->c_str(); | ||
} | ||
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} // detail | ||
} // sugar | ||
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inline Vector<STRSXP> trimws(const Vector<STRSXP>& x, const char* which = "both") { | ||
R_xlen_t i = 0, sz = x.size(); | ||
Vector<STRSXP> res = no_init(sz); | ||
std::string buffer; | ||
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if (*which == 'b') { | ||
for (; i < sz; i++) { | ||
if (traits::is_na<STRSXP>(x[i])) { | ||
res[i] = x[i]; | ||
} else { | ||
res[i] = sugar::detail::trim_both( | ||
x[i], | ||
LENGTH(x[i]), | ||
&buffer | ||
); | ||
} | ||
} | ||
} else if (*which == 'l') { | ||
for (; i < sz; i++) { | ||
if (traits::is_na<STRSXP>(x[i])) { | ||
res[i] = x[i]; | ||
} else { | ||
res[i] = sugar::detail::trim_left(x[i]); | ||
} | ||
} | ||
} else if (*which == 'r') { | ||
for (; i < sz; i++) { | ||
if (traits::is_na<STRSXP>(x[i])) { | ||
res[i] = x[i]; | ||
} else { | ||
res[i] = sugar::detail::trim_right( | ||
x[i], | ||
LENGTH(x[i]), | ||
&buffer | ||
); | ||
} | ||
} | ||
} else { | ||
stop("Invalid `which` argument '%s'!", which); | ||
return Vector<STRSXP>::create("Unreachable"); | ||
} | ||
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return res; | ||
} | ||
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inline Matrix<STRSXP> trimws(const Matrix<STRSXP>& x, const char* which = "both") { | ||
R_xlen_t i = 0, nr = x.nrow(), nc = x.ncol(), sz = x.size(); | ||
Matrix<STRSXP> res = no_init(nr, nc); | ||
std::string buffer; | ||
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if (*which == 'b') { | ||
for (; i < sz; i++) { | ||
if (traits::is_na<STRSXP>(x[i])) { | ||
res[i] = x[i]; | ||
} else { | ||
res[i] = sugar::detail::trim_both( | ||
x[i], | ||
LENGTH(x[i]), | ||
&buffer | ||
); | ||
} | ||
} | ||
} else if (*which == 'l') { | ||
for (; i < sz; i++) { | ||
if (traits::is_na<STRSXP>(x[i])) { | ||
res[i] = x[i]; | ||
} else { | ||
res[i] = sugar::detail::trim_left(x[i]); | ||
} | ||
} | ||
} else if (*which == 'r') { | ||
for (; i < sz; i++) { | ||
if (traits::is_na<STRSXP>(x[i])) { | ||
res[i] = x[i]; | ||
} else { | ||
res[i] = sugar::detail::trim_right( | ||
x[i], | ||
LENGTH(x[i]), | ||
&buffer | ||
); | ||
} | ||
} | ||
} else { | ||
stop("Invalid `which` argument '%s'!", which); | ||
return Matrix<STRSXP>(); | ||
} | ||
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return res; | ||
} | ||
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inline String trimws(const String& str, const char* which = "both") { | ||
std::string buffer; | ||
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if (*which == 'b') { | ||
if (traits::is_na<STRSXP>(str.get_sexp())) { | ||
return String(str.get_sexp()); | ||
} | ||
return sugar::detail::trim_both( | ||
str.get_cstring(), | ||
LENGTH(str.get_sexp()), | ||
&buffer | ||
); | ||
} | ||
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if (*which == 'l') { | ||
if (traits::is_na<STRSXP>(str.get_sexp())) { | ||
return String(str.get_sexp()); | ||
} | ||
return sugar::detail::trim_left(str.get_cstring()); | ||
} | ||
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if (*which == 'r') { | ||
if (traits::is_na<STRSXP>(str.get_sexp())) { | ||
return String(str.get_sexp()); | ||
} | ||
return sugar::detail::trim_right( | ||
str.get_cstring(), | ||
LENGTH(str.get_sexp()), | ||
&buffer | ||
); | ||
} | ||
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stop("Invalid `which` argument '%s'!", which); | ||
return String("Unreachable"); | ||
} | ||
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} // Rcpp | ||
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#endif // Rcpp__sugar__trimws_h |
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