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99 lines
3.5 KiB
C++
99 lines
3.5 KiB
C++
#pragma once
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#include <string_view>
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#include <vector>
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#include <chrono>
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#include <iterator>
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#include <charconv>
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#include <fmt/format.h>
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namespace llarp
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{
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/// Returns true if the first argument begins with the second argument
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inline constexpr bool
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starts_with(std::string_view str, std::string_view prefix)
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{
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return str.substr(0, prefix.size()) == prefix;
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}
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/// Returns true if the first argument ends with the second argument
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inline constexpr bool
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ends_with(std::string_view str, std::string_view suffix)
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{
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return str.size() >= suffix.size() && str.substr(str.size() - suffix.size()) == suffix;
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}
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/// removes a prefix from a string if it exists
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inline constexpr std::string_view
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strip_prefix(std::string_view str, std::string_view prefix)
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{
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if (starts_with(str, prefix))
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return str.substr(prefix.size());
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return str;
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}
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/// Splits a string on some delimiter string and returns a vector of string_view's pointing into
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/// the pieces of the original string. The pieces are valid only as long as the original string
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/// remains valid. Leading and trailing empty substrings are not removed. If delim is empty you
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/// get back a vector of string_views each viewing one character. If `trim` is true then leading
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/// and trailing empty values will be suppressed.
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///
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/// auto v = split("ab--c----de", "--"); // v is {"ab", "c", "", "de"}
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/// auto v = split("abc", ""); // v is {"a", "b", "c"}
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/// auto v = split("abc", "c"); // v is {"ab", ""}
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/// auto v = split("abc", "c", true); // v is {"ab"}
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/// auto v = split("-a--b--", "-"); // v is {"", "a", "", "b", "", ""}
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/// auto v = split("-a--b--", "-", true); // v is {"a", "", "b"}
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///
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std::vector<std::string_view>
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split(std::string_view str, std::string_view delim, bool trim = false);
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/// Splits a string on any 1 or more of the given delimiter characters and returns a vector of
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/// string_view's pointing into the pieces of the original string. If delims is empty this works
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/// the same as split(). `trim` works like split (suppresses leading and trailing empty string
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/// pieces).
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///
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/// auto v = split_any("abcdedf", "dcx"); // v is {"ab", "e", "f"}
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std::vector<std::string_view>
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split_any(std::string_view str, std::string_view delims, bool trim = false);
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/// Joins [begin, end) with a delimiter and returns the resulting string. Elements can be
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/// anything that is fmt formattable.
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template <typename It>
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std::string
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join(std::string_view delimiter, It begin, It end)
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{
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return fmt::format("{}", fmt::join(delimiter, begin, end));
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}
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/// Wrapper around the above that takes a container and passes c.begin(), c.end() to the above.
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template <typename Container>
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std::string
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join(std::string_view delimiter, const Container& c)
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{
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return join(delimiter, c.begin(), c.end());
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}
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/// Parses an integer of some sort from a string, requiring that the entire string be consumed
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/// during parsing. Return false if parsing failed, sets `value` and returns true if the entire
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/// string was consumed.
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template <typename T>
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bool
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parse_int(const std::string_view str, T& value, int base = 10)
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{
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T tmp;
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auto* strend = str.data() + str.size();
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auto [p, ec] = std::from_chars(str.data(), strend, tmp, base);
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if (ec != std::errc() || p != strend)
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return false;
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value = tmp;
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return true;
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}
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std::string
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lowercase_ascii_string(std::string src);
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std::string_view
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TrimWhitespace(std::string_view str);
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} // namespace llarp
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