split nihil into separate modules

1 files changed, 49 insertions, 0 deletions

diff --git a/nihil.util/next_word.ccm b/nihil.util/next_word.ccm
new file mode 100644
index 0000000..c5d3ad7
--- /dev/null
+++ b/nihil.util/next_word.ccm
@@ -0,0 +1,49 @@
+/*
+ * This source code is released into the public domain.
+ */
+
+module;
+
+#include <algorithm>
+#include <locale>
+#include <ranges>
+#include <string>
+#include <utility>
+
+export module nihil.util:next_word;
+
+import :skipws;
+
+namespace nihil {
+
+/*
+ * Return the next word from a string_view.  Skips leading whitespace, so
+ * calling this repeatedly will return each word from the string.
+ */
+
+export template<typename Char> [[nodiscard]]
+auto next_word(std::basic_string_view<Char> text,
+	       std::locale const &locale = std::locale())
+	-> std::pair<std::basic_string_view<Char>,
+		     std::basic_string_view<Char>>
+{
+	text = skipws(text, locale);
+
+	auto is_space = ctype_is(std::ctype_base::space, locale);
+	auto split_pos = std::ranges::find_if(text, is_space);
+
+	return {{std::ranges::begin(text), split_pos},
+		{split_pos, std::ranges::end(text)}};
+}
+
+export template<typename Char>
+auto next_word(std::basic_string_view<Char> *text,
+	       std::locale const &locale = std::locale())
+	-> std::basic_string_view<Char>
+{
+	auto [word, rest] = next_word(*text, locale);
+	*text = rest;
+	return word;
+}
+
+} // namespace nihil