[feature] views::char_strictly_to

include/seqan3/alphabet/views/char_strictly_to.hpp

@@ -0,0 +1,80 @@
+// -----------------------------------------------------------------------------------------------------
+// Copyright (c) 2006-2021, Knut Reinert & Freie Universität Berlin
+// Copyright (c) 2016-2021, Knut Reinert & MPI für molekulare Genetik
+// This file may be used, modified and/or redistributed under the terms of the 3-clause BSD-License
+// shipped with this file and also available at: https://github.com/seqan/seqan3/blob/master/LICENSE.md
+// -----------------------------------------------------------------------------------------------------
+
+/*!\file
+ * \brief Provides seqan3::views::char_strictly_to.
+ * \author Hannes Hauswedell <hannes.hauswedell AT fu-berlin.de>
+ */
+
+#pragma once
+
+#include <seqan3/std/ranges>
+
+#include <seqan3/alphabet/concept.hpp>
+#include <seqan3/utility/type_traits/basic.hpp>
+#include <seqan3/utility/views/deep.hpp>
+
+namespace seqan3::views
+{
+/*!\brief               A view over an alphabet, given a range of characters.
+ * \tparam urng_t       The type of the range being processed. See below for requirements. [template parameter is
+ *                      omitted in pipe notation]
+ * \tparam alphabet_t   The alphabet to convert to; must satisfy seqan3::alphabet.
+ * \param[in] urange    The range being processed. [parameter is omitted in pipe notation]
+ * \returns             A range of converted elements. See below for the properties of the returned range.
+ * \throws seqan3::invalid_char_assignment if an invalid character is encountered.
+ * \ingroup alphabet_views
+ *
+ * \details
+ *
+ * \header_file{seqan3/alphabet/views/char_strictly_to.hpp}
+ *
+ * This view differs from seqan3::views::chars_to in that it throws an exception if an invalid character conversion
+ * happens. See seqan3::char_strictly_to for more details.
+ *
+ * ### View properties
+ *
+ * This view is a **deep view**. Given a range-of-range as input (as opposed to just a range), it will apply
+ * the transformation on the innermost range (instead of the outermost range).
+ *
+ * | Concepts and traits              | `urng_t` (underlying range type)      | `rrng_t` (returned range type) |
+ * |----------------------------------|:-------------------------------------:|:------------------------------:|
+ * | std::ranges::input_range         | *required*                            | *preserved*                    |
+ * | std::ranges::forward_range       |                                       | *preserved*                    |
+ * | std::ranges::bidirectional_range |                                       | *preserved*                    |
+ * | std::ranges::random_access_range |                                       | *preserved*                    |
+ * | std::ranges::contiguous_range    |                                       | *lost*                         |
+ * |                                  |                                       |                                |
+ * | std::ranges::viewable_range      | *required*                            | *guaranteed*                   |
+ * | std::ranges::view                |                                       | *guaranteed*                   |
+ * | std::ranges::sized_range         |                                       | *preserved*                    |
+ * | std::ranges::common_range        |                                       | *preserved*                    |
+ * | std::ranges::output_range        |                                       | *lost*                         |
+ * | std::semiregular                 |                                       | *preserved*                    |
+ * | seqan3::const_iterable_range     |                                       | *preserved*                    |
+ * |                                  |                                       |                                |
+ * | std::ranges::range_reference_t   | seqan3::alphabet_char_t<alphabet_t>   | `alphabet_t`                   |
+ *
+ * See the \link views views submodule documentation \endlink for detailed descriptions of the view properties.
+ *
+ * ### Example
+ *
+ * \include test/snippet/alphabet/views/char_strictly_to.cpp
+ * \hideinitializer
+ *
+ * \experimentalapi{Experimental since version 3.2.}
+ */
+template <alphabet alphabet_type>
+inline auto const char_strictly_to = deep{std::views::transform([] (auto const in)
+{
+    static_assert(std::common_reference_with<decltype(in), alphabet_char_t<alphabet_type>>,
+                  "The innermost value type must have a common reference to underlying char type of alphabet_type.");
+    // call element-wise assign_char from the alphabet
+    return assign_char_strictly_to(in, alphabet_type{});
+})};
+
+} // namespace seqan3::views

test/snippet/alphabet/views/char_strictly_to.cpp

@@ -0,0 +1,16 @@
+#include <seqan3/alphabet/nucleotide/dna4.hpp>
+#include <seqan3/alphabet/views/char_strictly_to.hpp>
+#include <seqan3/core/debug_stream.hpp>
+
+int main()
+{
+    std::string_view str{"ACTTTGATAN"};
+    try
+    {
+        seqan3::debug_stream << (str | seqan3::views::char_strictly_to<seqan3::dna4>); // ACTTTGATA
+    }
+    catch (seqan3::invalid_char_assignment const &)
+    {
+       seqan3::debug_stream << "\n[ERROR] Invalid char!\n"; // Will throw on parsing 'N'
+    }
+}

test/snippet/alphabet/views/char_strictly_to.err

@@ -0,0 +1,2 @@
+ACTTTGATA
+[ERROR] Invalid char!

test/unit/alphabet/views/CMakeLists.txt

@@ -1,6 +1,7 @@
 add_subdirectories()
 
 seqan3_test(char_to_test.cpp)
+seqan3_test(char_strictly_to_test.cpp)
 seqan3_test(complement_test.cpp)
 seqan3_test(rank_to_test.cpp)
 seqan3_test(to_char_test.cpp)

test/unit/alphabet/views/char_strictly_to_test.cpp

@@ -0,0 +1,81 @@
+// -----------------------------------------------------------------------------------------------------
+// Copyright (c) 2006-2021, Knut Reinert & Freie Universität Berlin
+// Copyright (c) 2016-2021, Knut Reinert & MPI für molekulare Genetik
+// This file may be used, modified and/or redistributed under the terms of the 3-clause BSD-License
+// shipped with this file and also available at: https://github.com/seqan/seqan3/blob/master/LICENSE.md
+// -----------------------------------------------------------------------------------------------------
+
+#include <gtest/gtest.h>
+
+#include <seqan3/std/algorithm>
+#include <iostream>
+#include <seqan3/std/ranges>
+
+#include <seqan3/alphabet/detail/debug_stream_alphabet.hpp>
+#include <seqan3/alphabet/nucleotide/dna5.hpp>
+#include <seqan3/alphabet/views/char_strictly_to.hpp>
+#include <seqan3/test/expect_range_eq.hpp>
+#include <seqan3/utility/range/concept.hpp>
+
+using seqan3::operator""_dna5;
+
+TEST(view_char_strictly_to, basic)
+{
+    std::string vec{"ACTTTGATA"};
+    seqan3::dna5_vector cmp{"ACTTTGATA"_dna5};
+
+    // pipe notation
+    EXPECT_RANGE_EQ(cmp, vec | seqan3::views::char_strictly_to<seqan3::dna5>);
+
+    // function notation
+    EXPECT_RANGE_EQ(cmp, seqan3::views::char_strictly_to<seqan3::dna5>(vec));
+
+    // combinability
+    seqan3::dna5_vector cmp2{"ATAGTTTCA"_dna5};
+    EXPECT_RANGE_EQ(cmp2, vec | seqan3::views::char_strictly_to<seqan3::dna5> | std::views::reverse);
+}
+
+TEST(view_char_strictly_to, deep_view)
+{
+    std::vector<std::string> foo{"ACGTA", "TGCAT"};
+
+    auto v = foo | seqan3::views::char_strictly_to<seqan3::dna5>;
+
+    ASSERT_EQ(std::ranges::size(v), 2u);
+    EXPECT_RANGE_EQ(v[0], "ACGTA"_dna5);
+    EXPECT_RANGE_EQ(v[1], "TGCAT"_dna5);
+}
+
+TEST(view_char_strictly_to, concepts)
+{
+    std::string vec{"ACTTTGATA"};
+    EXPECT_TRUE(std::ranges::input_range<decltype(vec)>);
+    EXPECT_TRUE(std::ranges::forward_range<decltype(vec)>);
+    EXPECT_TRUE(std::ranges::bidirectional_range<decltype(vec)>);
+    EXPECT_TRUE(std::ranges::random_access_range<decltype(vec)>);
+    EXPECT_FALSE(std::ranges::view<decltype(vec)>);
+    EXPECT_TRUE(std::ranges::sized_range<decltype(vec)>);
+    EXPECT_TRUE(std::ranges::common_range<decltype(vec)>);
+    EXPECT_TRUE(seqan3::const_iterable_range<decltype(vec)>);
+    EXPECT_TRUE((std::ranges::output_range<decltype(vec), char>));
+
+    auto v1 = vec | seqan3::views::char_strictly_to<seqan3::dna5>;
+    EXPECT_TRUE(std::ranges::input_range<decltype(v1)>);
+    EXPECT_TRUE(std::ranges::forward_range<decltype(v1)>);
+    EXPECT_TRUE(std::ranges::bidirectional_range<decltype(v1)>);
+    EXPECT_TRUE(std::ranges::random_access_range<decltype(v1)>);
+    EXPECT_TRUE(std::ranges::view<decltype(v1)>);
+    EXPECT_TRUE(std::ranges::sized_range<decltype(v1)>);
+    EXPECT_TRUE(std::ranges::common_range<decltype(v1)>);
+    EXPECT_TRUE(seqan3::const_iterable_range<decltype(v1)>);
+    EXPECT_FALSE((std::ranges::output_range<decltype(v1), seqan3::dna5>));
+    EXPECT_FALSE((std::ranges::output_range<decltype(v1), char>));
+}
+
+TEST(view_char_strictly_to, exception)
+{
+    std::string foo = "ACGPTA";
+
+    auto v = foo | seqan3::views::char_strictly_to<seqan3::dna5>;
+    EXPECT_THROW((std::ranges::equal(v, "ACGNTA"_dna5)), seqan3::invalid_char_assignment);
+}