diff options
Diffstat (limited to 'libbutl/utility.ixx')
| -rw-r--r-- | libbutl/utility.ixx | 78 |
1 files changed, 74 insertions, 4 deletions
diff --git a/libbutl/utility.ixx b/libbutl/utility.ixx index 6501bf7..fda1ce5 100644 --- a/libbutl/utility.ixx +++ b/libbutl/utility.ixx @@ -1,12 +1,10 @@ // file : libbutl/utility.ixx -*- C++ -*- // license : MIT; see accompanying LICENSE file -#ifndef __cpp_lib_modules_ts #include <cctype> // toupper(), tolower(), is*() #include <cwctype> // isw*() #include <algorithm> // for_each() #include <stdexcept> // invalid_argument -#endif namespace butl { @@ -145,6 +143,12 @@ namespace butl } inline bool + wspace (char c) + { + return std::isspace (c); + } + + inline bool alpha (wchar_t c) { return std::iswalpha (c); @@ -168,6 +172,12 @@ namespace butl return std::iswxdigit (c); } + inline bool + wspace (wchar_t c) + { + return std::iswspace (c); + } + inline std::size_t next_word (const std::string& s, std::size_t& b, std::size_t& e, char d1, char d2) @@ -200,6 +210,66 @@ namespace butl return e - b; } + inline std::size_t + next_word (const std::string& s, + std::size_t n, std::size_t& b, std::size_t& e, std::size_t& m, + char d1, char d2) + { + // An empty word will necessarily be represented as b and e being the + // position of a delimiter. Consider these corner cases (in all three we + // should produce two words): + // + // \n + // a\n + // \na + // + // It feels sensible to represent an empty word as the position of the + // trailing delimiter except if it is the last character (the first two + // cases). Thus the additional m state, which, if 0 or 1 indicates the + // number of delimiters to skip before parsing the next word and 2 if + // this is a trailing delimiter for which we need to fake an empty word + // with the leading delimiter. + + if (b != e) + b = e; + + if (m > 1) + { + --m; + return 0; + } + + // Skip the leading delimiter, if any. + // + b += m; + + if (b == n) + { + e = n; + return 0; + } + + // Find first trailing delimiter. + // + m = 0; + for (e = b; e != n; ++e) + { + if (s[e] == d1 || s[e] == d2) + { + m = 1; + + // Handle the special delimiter as the last character case. + // + if (e + 1 == n) + ++m; + + break; + } + } + + return e - b; + } + inline std::string& sanitize_identifier (std::string& s) { @@ -361,14 +431,14 @@ namespace butl } inline auto_thread_env:: - auto_thread_env (auto_thread_env&& x) + auto_thread_env (auto_thread_env&& x) noexcept : prev_env (std::move (x.prev_env)) { x.prev_env = nullopt; } inline auto_thread_env& auto_thread_env:: - operator= (auto_thread_env&& x) + operator= (auto_thread_env&& x) noexcept { if (this != &x) { |