Add docs

Author: TartanLlama

docs/api.rst

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+API
+===
+
+.. class:: ctll::fixed_string
+
+  *Some documentation*
+
+  Example: ::
+
+    static constexpr auto pattern = ctll::fixed_string{ "h.*" };
+  
+    constexpr auto match(std::string_view sv) noexcept {
+    	return ctre::match<pattern>(sv);
+    }
+
+.. class:: template<class Iterator, class... Captures> ctre::regex_results
+
+  .. function:: template<size_t Id> constexpr auto get()
+                template<class Id> constexpr auto get()
+
+    Returns the capture specified by ``Id``.
+
+  .. function:: constexpr size_t size()
+    
+    Returns the number of captures in this result object.
+
+.. function:: template<class... Args> constexpr ctre::regex_results<deduced> match(Args&&... args)
+
+  *Some documentation*
+
+.. function:: template<class... Args> constexpr ctre::regex_results<deduced> search(Args&&... args)
+
+  *Some documentation*
+
+*More functions and types*

docs/conf.py

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+# Configuration file for the Sphinx documentation builder.
+#
+# This file only contains a selection of the most common options. For a full
+# list see the documentation:
+# http://www.sphinx-doc.org/en/master/config
+
+# -- Path setup --------------------------------------------------------------
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#
+# import os
+# import sys
+# sys.path.insert(0, os.path.abspath('.'))
+
+
+# -- Project information -----------------------------------------------------
+
+project = 'ctre'
+copyright = '2019, Hana Dusikova'
+author = 'Hana Dusikova'
+master_doc = 'index'
+primary_domain = 'cpp'
+highlight_language = 'cpp'
+
+# -- General configuration ---------------------------------------------------
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = [
+]
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This pattern also affects html_static_path and html_extra_path.
+exclude_patterns = []
+
+
+# -- Options for HTML output -------------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+#
+html_theme = 'sphinx_rtd_theme'
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ['_static']

docs/examples.rst

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+Examples
+========
+
+Extracting a number from input
+------------------------------
+::
+
+  std::optional<std::string_view> extract_number(std::string_view s) noexcept {
+  	if (auto m = ctre::match<"[a-z]+([0-9]+)">(s)) {
+          return m.get<1>().to_view();
+      } else {
+          return std::nullopt;
+      }
+  }
+
+`link to compiler explorer <https://gcc.godbolt.org/z/5U67_e>`_
+
+Extracting values from date
+---------------------------
+::
+
+
+  struct date { std::string_view year; std::string_view month; std::string_view day; };
+  std::optional<date> extract_date(std::string_view s) noexcept {
+      using namespace ctre::literals;
+      if (auto [whole, year, month, day] = ctre::match<"(\\d{4})/(\\d{1,2})/(\\d{1,2})">(s); whole) {
+          return date{year, month, day};
+      } else {
+          return std::nullopt;
+      }
+  }
+  
+  //static_assert(extract_date("2018/08/27"sv).has_value());
+  //static_assert((*extract_date("2018/08/27"sv)).year == "2018"sv);
+  //static_assert((*extract_date("2018/08/27"sv)).month == "08"sv);
+  //static_assert((*extract_date("2018/08/27"sv)).day == "27"sv);
+
+`link to compiler explorer <https://gcc.godbolt.org/z/x64CVp>`_
+
+Lexer
+-----
+::
+
+  enum class type {
+      unknown, identifier, number
+  };
+  
+  struct lex_item {
+      type t;
+      std::string_view c;
+  };
+  
+  std::optional<lex_item> lexer(std::string_view v) noexcept {
+      if (auto [m,id,num] = ctre::match<"([a-z]+)|([0-9]+)">(v); m) {
+          if (id) {
+              return lex_item{type::identifier, id};
+          } else if (num) {
+              return lex_item{type::number, num};
+          }
+      }
+      return std::nullopt;
+  }
+
+`link to compiler explorer <https://gcc.godbolt.org/z/PKTiCC>`_
+
+Range over input
+----------------
+
+This support is preliminary and probably the API will be changed.
+
+::
+
+  auto input = "123,456,768"sv;
+  
+  for (auto match: ctre::range<"([0-9]+),?">(input)) {
+  	std::cout << std::string_view{match.get<0>()} << "\n";
+  }

docs/index.rst

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+ctre
+====
+
+A compile-time (almost) PCRE-compatible regular expression matcher for C++.
+
+Overview
+========
+
+Fast compile-time regular expressions with support for matching/searching/capturing at compile-time or runtime. ::
+
+  ctre::match<"REGEX">(subject); // C++20
+  "REGEX"_ctre.match(subject); // C++17 + N3599 extension
+
+.. toctree::
+   :maxdepth: 2
+
+   api
+   examples
+   regex_syntax
+
+Supported compilers
+===================
+
+- clang 6.0+ (template UDL, C++17 syntax)
+- xcode clang 10.0+ (template UDL, C++17 syntax)
+- gcc 7.4+ (template UDL, C++17 syntax)
+- gcc 9.0+ (C++17 & C++20 cNTTP syntax)
+- MSVC 15.8.8+ (C++17 syntax only)
+
+Basic Usage
+===========
+
+Template UDL syntax
+-------------------
+
+Compiler must support N3599 extension, as GNU extension in gcc (not in GCC 9.1+) and clang. ::
+
+  constexpr auto match(std::string_view sv) noexcept {
+  	using namespace ctre::literals;
+  	return "h.*"_ctre.match(sv);
+  }
+
+If you need N3599 extension in GCC 9.1+ you can't use -pedantic mode and define the macro ``CTRE_ENABLE_LITERALS``.
+
+C++17 syntax
+------------
+
+You can provide pattern as a constexpr ``ctll::fixed_string variable``. ::
+
+  static constexpr auto pattern = ctll::fixed_string{ "h.*" };
+  
+  constexpr auto match(std::string_view sv) noexcept {
+  	return ctre::match<pattern>(sv);
+  }
+
+(this is tested in MSVC 15.8.8)
+
+C++20 syntax
+------------
+
+Currently only compiler which supports cNTTP syntax ``ctre::match<PATTERN>(subject)`` is GCC 9+. ::
+
+  constexpr auto match(std::string_view sv) noexcept {
+  	return ctre::match<"h.*">(sv);
+  }
+

docs/regex_syntax.rst

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+Regex Syntax
+============
+
+The library supports most of the `PCRE <pcre.org>`_ syntax with a few exceptions:
+
+- atomic groups
+- boundaries other than ^$
+- callouts
+- character properties
+- comments
+- conditional patterns
+- control characters (\\cX)
+- horizontal / vertical character classes (\\h\\H\\v\\V)
+- match point reset (\\K)
+- named characters
+- octal numbers
+- options / modes
+- subroutines
+- unicode grapheme cluster (\\X)
+
+*more detailed regex syntax information could go here*