Smdn.Text.Ondulish version 4.0.0-preview1

Released package

• NuGet Smdn.Text.Ondulish version 4.0.0-preview1

Release notes

The full release notes are available at gist.

Change log

Change log in this release:

• 2023-01-01 update assembly version
• 2023-01-01 make internal classes sealed
• 2022-12-29 fix the phase of including swig bindings to the compile items
• 2022-12-29 install dependency packages for build on GitHub actions
• 2022-12-29 fix Makefile directory
• 2022-12-29 generate MeCab IPA dictionary ahead of building project
• 2022-12-29 make sure to include generated SWIG binding sources to the compile items
• 2022-12-28 set default value to the parameter 'convertKatakanaToNarrow'
• 2022-12-28 change order of parameters
• 2022-12-28 add Translate() overload to accept TextReader
• 2022-12-28 make field static
• 2022-12-28 split implementations into individual files
• 2022-12-28 remove code for debugging
• 2022-12-28 refer assembly directory instead of process directory for loading bundled mecab dictionary
• 2022-12-28 fix Translator constructors to accept Tagger that created externally
• 2022-12-27 improve nupkg content
• 2022-12-27 add fallback impementation
• 2022-12-27 bump Smdn.Fundamental.Csv up to 3.1.0
• 2022-12-26 improve end-of-line treatments
• 2022-12-26 add OndulishDictionaries.Open(Phrase|Word)DictionaryStream() and use them
• 2022-12-25 make Ondulish dictionaries as an individual package
• 2022-12-25 use using statements
• 2022-12-25 add support for loading dictionaries from Stream
• 2022-12-25 set default value to parameter 'convertKatakanaToNarrow'
• 2022-12-25 add default constructor
• 2022-12-25 fix to specify mecab dictionary path from the code instead of using mecabrc
• 2022-12-25 change to output mecab files under the 'mecab' directory
• 2022-12-25 clarify pack target files and its package path
• 2022-12-24 add RuntimeIdentifiers
• 2022-12-24 add MSBuild targets for calling mecab make targets
• 2022-12-24 reduce allocations
• 2022-12-24 make lambda static
• 2022-12-24 enable nullability annotations
• 2022-12-24 check arguments
• 2022-12-24 check arguments
• 2022-12-23 implement IDisposable properly
• 2022-12-23 use switch expressions
• 2022-12-23 improve #if switches
• 2022-12-23 fix warnings proposed from code analyzer
• 2022-12-23 add notes
• 2022-12-23 use SPDX license headers
• 2022-12-23 use Smdn.MSBuild.ProjectAssets.Library
• 2022-12-22 rewrite build script for MeCab with Makefile
• 2022-12-22 use NuGet packages instead of local project
• 2022-12-22 use the target framework net6.0 instead of net5.0
• 2022-12-22 change namespaces to Smdn.Text.Ondulish
• 2022-12-22 rename assembly name to Smdn.Text.Ondulish
• 2022-12-22 rename assembly and namespace directories to Smdn.Text.Ondulish

API changes

API changes in this release:

diff --git a/doc/api-list/Smdn.Text.Ondulish/Smdn.Text.Ondulish-net6.0.apilist.cs b/doc/api-list/Smdn.Text.Ondulish/Smdn.Text.Ondulish-net6.0.apilist.cs
new file mode 100644
index 0000000..4d6157c
--- /dev/null
+++ b/doc/api-list/Smdn.Text.Ondulish/Smdn.Text.Ondulish-net6.0.apilist.cs
@@ -0,0 +1,223 @@
+// Smdn.Text.Ondulish.dll (Smdn.Text.Ondulish-4.0.0-preview1)
+//   Name: Smdn.Text.Ondulish
+//   AssemblyVersion: 4.0.0.0
+//   InformationalVersion: 4.0.0-preview1+e47f0cd7079b79c34ed00e252d68a337f739d938
+//   TargetFramework: .NETCoreApp,Version=v6.0
+//   Configuration: Release
+#nullable enable annotations
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using MeCab;
+
+namespace MeCab {
+  public class DictionaryInfo : IDisposable {
+    protected bool swigCMemOwn;
+
+    public DictionaryInfo() {}
+
+    public string charset { get; }
+    public string filename { get; }
+    public uint lsize { get; }
+    public DictionaryInfo next { get; }
+    public uint rsize { get; }
+    public uint size { get; }
+    public int type { get; }
+    public ushort version { get; }
+
+    protected virtual void Dispose(bool disposing) {}
+    public void Dispose() {}
+    ~DictionaryInfo() {}
+  }
+
+  public class Lattice : IDisposable {
+    protected bool swigCMemOwn;
+
+    public Lattice() {}
+
+    protected virtual void Dispose(bool disposing) {}
+    public void Dispose() {}
+    ~Lattice() {}
+    public virtual double Z() {}
+    public virtual void add_request_type(int request_type) {}
+    public virtual Node begin_nodes(uint pos) {}
+    public virtual Node bos_node() {}
+    public virtual int boundary_constraint(uint pos) {}
+    public virtual void clear() {}
+    public virtual Node end_nodes(uint pos) {}
+    public virtual string enumNBestAsString(uint N) {}
+    public virtual Node eos_node() {}
+    public virtual string feature_constraint(uint pos) {}
+    public virtual bool has_constraint() {}
+    public virtual bool has_request_type(int request_type) {}
+    public virtual bool is_available() {}
+    public virtual Node newNode() {}
+    public virtual bool next() {}
+    public virtual void remove_request_type(int request_type) {}
+    public virtual int request_type() {}
+    public virtual string sentence() {}
+    public virtual void set_Z(double Z) {}
+    public virtual void set_boundary_constraint(uint pos, int boundary_constraint_type) {}
+    public virtual void set_feature_constraint(uint begin_pos, uint end_pos, string feature) {}
+    public virtual void set_request_type(int request_type) {}
+    public virtual void set_result(string result) {}
+    public void set_sentence(string sentence) {}
+    public virtual void set_theta(float theta) {}
+    public virtual void set_what(string str) {}
+    public virtual uint size() {}
+    public virtual float theta() {}
+    public virtual string toString() {}
+    public virtual string toString(Node node) {}
+    public virtual string what() {}
+  }
+
+  public class MeCab {
+    public static readonly int MECAB_ALLOCATE_SENTENCE = 64;
+    public static readonly int MECAB_ALL_MORPHS = 32;
+    public static readonly int MECAB_ALTERNATIVE = 16;
+    public static readonly int MECAB_ANY_BOUNDARY = 0;
+    public static readonly int MECAB_BOS_NODE = 2;
+    public static readonly int MECAB_EON_NODE = 4;
+    public static readonly int MECAB_EOS_NODE = 3;
+    public static readonly int MECAB_INSIDE_TOKEN = 2;
+    public static readonly int MECAB_MARGINAL_PROB = 8;
+    public static readonly int MECAB_NBEST = 2;
+    public static readonly int MECAB_NOR_NODE = 0;
+    public static readonly int MECAB_ONE_BEST = 1;
+    public static readonly int MECAB_PARTIAL = 4;
+    public static readonly int MECAB_SYS_DIC = 0;
+    public static readonly int MECAB_TOKEN_BOUNDARY = 1;
+    public static readonly int MECAB_UNK_DIC = 2;
+    public static readonly int MECAB_UNK_NODE = 1;
+    public static readonly int MECAB_USR_DIC = 1;
+    public static readonly string VERSION = "0.996";
+
+    public MeCab() {}
+  }
+
+  public class Model : IDisposable {
+    public static string version() {}
+
+    protected bool swigCMemOwn;
+
+    public Model() {}
+    public Model(string argc) {}
+
+    protected virtual void Dispose(bool disposing) {}
+    public void Dispose() {}
+    ~Model() {}
+    public virtual Lattice createLattice() {}
+    public virtual Tagger createTagger() {}
+    public virtual DictionaryInfo dictionary_info() {}
+    public virtual Node lookup(string begin, string end, Lattice lattice) {}
+    public virtual bool swap(Model model) {}
+    public virtual int transition_cost(ushort rcAttr, ushort lcAttr) {}
+  }
+
+  public class Node : IDisposable {
+    protected bool swigCMemOwn;
+
+    public float alpha { get; }
+    public float beta { get; }
+    public Node bnext { get; }
+    public byte char_type { get; }
+    public int cost { get; }
+    public Node enext { get; }
+    public string feature { get; }
+    public uint id { get; }
+    public byte isbest { get; }
+    public ushort lcAttr { get; }
+    public ushort length { get; }
+    public Path lpath { get; }
+    public Node next { get; }
+    public ushort posid { get; }
+    public Node prev { get; }
+    public float prob { get; set; }
+    public ushort rcAttr { get; }
+    public ushort rlength { get; }
+    public Path rpath { get; }
+    public byte stat { get; }
+    public string surface { get; }
+    public short wcost { get; }
+
+    protected virtual void Dispose(bool disposing) {}
+    public void Dispose() {}
+    ~Node() {}
+  }
+
+  public class Path : IDisposable {
+    protected bool swigCMemOwn;
+
+    public int cost { get; }
+    public Path lnext { get; }
+    public Node lnode { get; }
+    public float prob { get; set; }
+    public Path rnext { get; }
+    public Node rnode { get; }
+
+    protected virtual void Dispose(bool disposing) {}
+    public void Dispose() {}
+    ~Path() {}
+  }
+
+  public class Tagger : IDisposable {
+    public static bool parse(Model model, Lattice lattice) {}
+    public static string version() {}
+
+    protected bool swigCMemOwn;
+
+    public Tagger() {}
+    public Tagger(string argc) {}
+
+    protected virtual void Dispose(bool disposing) {}
+    public void Dispose() {}
+    ~Tagger() {}
+    public virtual bool all_morphs() {}
+    public virtual DictionaryInfo dictionary_info() {}
+    public virtual string formatNode(Node node) {}
+    public virtual int lattice_level() {}
+    public virtual string next() {}
+    public virtual Node nextNode() {}
+    public virtual bool parse(Lattice lattice) {}
+    public virtual string parse(string str) {}
+    public virtual string parseNBest(uint N, string str) {}
+    public virtual bool parseNBestInit(string str) {}
+    public virtual Node parseToNode(string str) {}
+    public string parseToString(string str) {}
+    public string parseToString(string str, uint length) {}
+    public virtual bool partial() {}
+    public virtual int request_type() {}
+    public virtual void set_all_morphs(bool all_morphs) {}
+    public virtual void set_lattice_level(int level) {}
+    public virtual void set_partial(bool @partial) {}
+    public virtual void set_request_type(int request_type) {}
+    public virtual void set_theta(float theta) {}
+    public virtual float theta() {}
+    public virtual string what() {}
+  }
+}
+
+namespace Smdn.Text.Ondulish {
+  public static class KanaUtils {
+    public static string ConvertWideHiraganaToKatakana(string input) {}
+    public static string ConvertWideKatakanaToHiragana(string input) {}
+    public static string ConvertWideKatakanaToNarrowKatakana(string input) {}
+  }
+
+  public class Translator : IDisposable {
+    public static Tagger CreateTaggerForBundledDictionary() {}
+
+    public Translator() {}
+    public Translator(Tagger tagger, bool shouldDisposeTagger) {}
+
+    public IReadOnlyDictionary<string, string> PhraseDictionary { get; }
+    public IReadOnlyDictionary<string, string> WordDictionary { get; }
+
+    protected virtual void Dispose(bool disposing) {}
+    public void Dispose() {}
+    public string Translate(string input, bool convertKatakanaToNarrow = true) {}
+    public void Translate(TextReader input, TextWriter output, bool convertKatakanaToNarrow = true) {}
+    public void Translate(string input, TextWriter output, bool convertKatakanaToNarrow = true) {}
+  }
+}
diff --git a/doc/api-list/Smdn.Text.Ondulish/Smdn.Text.Ondulish-netstandard2.1.apilist.cs b/doc/api-list/Smdn.Text.Ondulish/Smdn.Text.Ondulish-netstandard2.1.apilist.cs
new file mode 100644
index 0000000..17e77b7
--- /dev/null
+++ b/doc/api-list/Smdn.Text.Ondulish/Smdn.Text.Ondulish-netstandard2.1.apilist.cs
@@ -0,0 +1,223 @@
+// Smdn.Text.Ondulish.dll (Smdn.Text.Ondulish-4.0.0-preview1)
+//   Name: Smdn.Text.Ondulish
+//   AssemblyVersion: 4.0.0.0
+//   InformationalVersion: 4.0.0-preview1+e47f0cd7079b79c34ed00e252d68a337f739d938
+//   TargetFramework: .NETStandard,Version=v2.1
+//   Configuration: Release
+#nullable enable annotations
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using MeCab;
+
+namespace MeCab {
+  public class DictionaryInfo : IDisposable {
+    protected bool swigCMemOwn;
+
+    public DictionaryInfo() {}
+
+    public string charset { get; }
+    public string filename { get; }
+    public uint lsize { get; }
+    public DictionaryInfo next { get; }
+    public uint rsize { get; }
+    public uint size { get; }
+    public int type { get; }
+    public ushort version { get; }
+
+    protected virtual void Dispose(bool disposing) {}
+    public void Dispose() {}
+    ~DictionaryInfo() {}
+  }
+
+  public class Lattice : IDisposable {
+    protected bool swigCMemOwn;
+
+    public Lattice() {}
+
+    protected virtual void Dispose(bool disposing) {}
+    public void Dispose() {}
+    ~Lattice() {}
+    public virtual double Z() {}
+    public virtual void add_request_type(int request_type) {}
+    public virtual Node begin_nodes(uint pos) {}
+    public virtual Node bos_node() {}
+    public virtual int boundary_constraint(uint pos) {}
+    public virtual void clear() {}
+    public virtual Node end_nodes(uint pos) {}
+    public virtual string enumNBestAsString(uint N) {}
+    public virtual Node eos_node() {}
+    public virtual string feature_constraint(uint pos) {}
+    public virtual bool has_constraint() {}
+    public virtual bool has_request_type(int request_type) {}
+    public virtual bool is_available() {}
+    public virtual Node newNode() {}
+    public virtual bool next() {}
+    public virtual void remove_request_type(int request_type) {}
+    public virtual int request_type() {}
+    public virtual string sentence() {}
+    public virtual void set_Z(double Z) {}
+    public virtual void set_boundary_constraint(uint pos, int boundary_constraint_type) {}
+    public virtual void set_feature_constraint(uint begin_pos, uint end_pos, string feature) {}
+    public virtual void set_request_type(int request_type) {}
+    public virtual void set_result(string result) {}
+    public void set_sentence(string sentence) {}
+    public virtual void set_theta(float theta) {}
+    public virtual void set_what(string str) {}
+    public virtual uint size() {}
+    public virtual float theta() {}
+    public virtual string toString() {}
+    public virtual string toString(Node node) {}
+    public virtual string what() {}
+  }
+
+  public class MeCab {
+    public static readonly int MECAB_ALLOCATE_SENTENCE = 64;
+    public static readonly int MECAB_ALL_MORPHS = 32;
+    public static readonly int MECAB_ALTERNATIVE = 16;
+    public static readonly int MECAB_ANY_BOUNDARY = 0;
+    public static readonly int MECAB_BOS_NODE = 2;
+    public static readonly int MECAB_EON_NODE = 4;
+    public static readonly int MECAB_EOS_NODE = 3;
+    public static readonly int MECAB_INSIDE_TOKEN = 2;
+    public static readonly int MECAB_MARGINAL_PROB = 8;
+    public static readonly int MECAB_NBEST = 2;
+    public static readonly int MECAB_NOR_NODE = 0;
+    public static readonly int MECAB_ONE_BEST = 1;
+    public static readonly int MECAB_PARTIAL = 4;
+    public static readonly int MECAB_SYS_DIC = 0;
+    public static readonly int MECAB_TOKEN_BOUNDARY = 1;
+    public static readonly int MECAB_UNK_DIC = 2;
+    public static readonly int MECAB_UNK_NODE = 1;
+    public static readonly int MECAB_USR_DIC = 1;
+    public static readonly string VERSION = "0.996";
+
+    public MeCab() {}
+  }
+
+  public class Model : IDisposable {
+    public static string version() {}
+
+    protected bool swigCMemOwn;
+
+    public Model() {}
+    public Model(string argc) {}
+
+    protected virtual void Dispose(bool disposing) {}
+    public void Dispose() {}
+    ~Model() {}
+    public virtual Lattice createLattice() {}
+    public virtual Tagger createTagger() {}
+    public virtual DictionaryInfo dictionary_info() {}
+    public virtual Node lookup(string begin, string end, Lattice lattice) {}
+    public virtual bool swap(Model model) {}
+    public virtual int transition_cost(ushort rcAttr, ushort lcAttr) {}
+  }
+
+  public class Node : IDisposable {
+    protected bool swigCMemOwn;
+
+    public float alpha { get; }
+    public float beta { get; }
+    public Node bnext { get; }
+    public byte char_type { get; }
+    public int cost { get; }
+    public Node enext { get; }
+    public string feature { get; }
+    public uint id { get; }
+    public byte isbest { get; }
+    public ushort lcAttr { get; }
+    public ushort length { get; }
+    public Path lpath { get; }
+    public Node next { get; }
+    public ushort posid { get; }
+    public Node prev { get; }
+    public float prob { get; set; }
+    public ushort rcAttr { get; }
+    public ushort rlength { get; }
+    public Path rpath { get; }
+    public byte stat { get; }
+    public string surface { get; }
+    public short wcost { get; }
+
+    protected virtual void Dispose(bool disposing) {}
+    public void Dispose() {}
+    ~Node() {}
+  }
+
+  public class Path : IDisposable {
+    protected bool swigCMemOwn;
+
+    public int cost { get; }
+    public Path lnext { get; }
+    public Node lnode { get; }
+    public float prob { get; set; }
+    public Path rnext { get; }
+    public Node rnode { get; }
+
+    protected virtual void Dispose(bool disposing) {}
+    public void Dispose() {}
+    ~Path() {}
+  }
+
+  public class Tagger : IDisposable {
+    public static bool parse(Model model, Lattice lattice) {}
+    public static string version() {}
+
+    protected bool swigCMemOwn;
+
+    public Tagger() {}
+    public Tagger(string argc) {}
+
+    protected virtual void Dispose(bool disposing) {}
+    public void Dispose() {}
+    ~Tagger() {}
+    public virtual bool all_morphs() {}
+    public virtual DictionaryInfo dictionary_info() {}
+    public virtual string formatNode(Node node) {}
+    public virtual int lattice_level() {}
+    public virtual string next() {}
+    public virtual Node nextNode() {}
+    public virtual bool parse(Lattice lattice) {}
+    public virtual string parse(string str) {}
+    public virtual string parseNBest(uint N, string str) {}
+    public virtual bool parseNBestInit(string str) {}
+    public virtual Node parseToNode(string str) {}
+    public string parseToString(string str) {}
+    public string parseToString(string str, uint length) {}
+    public virtual bool partial() {}
+    public virtual int request_type() {}
+    public virtual void set_all_morphs(bool all_morphs) {}
+    public virtual void set_lattice_level(int level) {}
+    public virtual void set_partial(bool @partial) {}
+    public virtual void set_request_type(int request_type) {}
+    public virtual void set_theta(float theta) {}
+    public virtual float theta() {}
+    public virtual string what() {}
+  }
+}
+
+namespace Smdn.Text.Ondulish {
+  public static class KanaUtils {
+    public static string ConvertWideHiraganaToKatakana(string input) {}
+    public static string ConvertWideKatakanaToHiragana(string input) {}
+    public static string ConvertWideKatakanaToNarrowKatakana(string input) {}
+  }
+
+  public class Translator : IDisposable {
+    public static Tagger CreateTaggerForBundledDictionary() {}
+
+    public Translator() {}
+    public Translator(Tagger tagger, bool shouldDisposeTagger) {}
+
+    public IReadOnlyDictionary<string, string> PhraseDictionary { get; }
+    public IReadOnlyDictionary<string, string> WordDictionary { get; }
+
+    protected virtual void Dispose(bool disposing) {}
+    public void Dispose() {}
+    public string Translate(string input, bool convertKatakanaToNarrow = true) {}
+    public void Translate(TextReader input, TextWriter output, bool convertKatakanaToNarrow = true) {}
+    public void Translate(string input, TextWriter output, bool convertKatakanaToNarrow = true) {}
+  }
+}

Full changes

Full changes in this release:

diff --git a/src/Smdn.Text.Ondulish/MeCab.targets b/src/Smdn.Text.Ondulish/MeCab.targets
new file mode 100644
index 0000000..d47b7ee
--- /dev/null
+++ b/src/Smdn.Text.Ondulish/MeCab.targets
@@ -0,0 +1,51 @@
+<!--
+SPDX-FileCopyrightText: 2022 smdn <smdn@smdn.jp>
+SPDX-License-Identifier: MIT
+-->
+<Project>
+  <PropertyGroup>
+    <BuildInParallel>false</BuildInParallel> <!-- disable parallel builds to avoid running simultaneous MeCab build -->
+  </PropertyGroup>
+
+  <Target
+    Name="MeCabBindings_Build"
+    BeforeTargets="DispatchToInnerBuilds;BeforeBuild"
+  >
+    <Exec
+      Command="make install-buildtime-deps-ubuntu.22.04 -f install-deps.mk"
+      WorkingDirectory="$(MSBuildThisFileDirectory)..\..\eng\dependencies\"
+      Condition="
+        '$(GITHUB_ACTIONS)' == 'true' and
+        $([System.Runtime.InteropServices.RuntimeInformation]::RuntimeIdentifier.StartsWith('ubuntu.22.04'))
+      "
+    />
+
+    <!-- generate MeCab shared library and SWIG bindings -->
+    <Exec
+      Command="make mecab-bindings"
+      WorkingDirectory="$(MeCabMakefileDirectory)"
+    />
+
+    <!-- make sure to include generated SWIG binding source files to the <Compile> items -->
+    <ItemGroup>
+      <Compile Include="$(MeCabBindingsDirectory)src\*.cs" />
+    </ItemGroup>
+
+    <!-- generate MeCab IPA dictionary -->
+    <Exec
+      Command="make mecab-ipadic"
+      WorkingDirectory="$(MeCabMakefileDirectory)"
+    />
+  </Target>
+
+  <Target
+    Name="MeCabBindings_Clean"
+    AfterTargets="Clean"
+  >
+    <!-- clean MeCab shared library and swig bindings -->
+    <Exec
+      Command="make clean-mecab-bindings"
+      WorkingDirectory="$(MeCabMakefileDirectory)"
+    />
+  </Target>
+</Project>
diff --git a/src/Smdn.Text.Ondulish/Smdn.Text.Ondulish.csproj b/src/Smdn.Text.Ondulish/Smdn.Text.Ondulish.csproj
new file mode 100644
index 0000000..3b8c4b0
--- /dev/null
+++ b/src/Smdn.Text.Ondulish/Smdn.Text.Ondulish.csproj
@@ -0,0 +1,132 @@
+<!--
+SPDX-FileCopyrightText: 2012 smdn <smdn@smdn.jp>
+SPDX-License-Identifier: MIT
+-->
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFrameworks>net6.0;netstandard2.1</TargetFrameworks>
+    <RuntimeIdentifiers>ubuntu.22.04-x64</RuntimeIdentifiers>
+    <VersionPrefix>4.0.0</VersionPrefix>
+    <VersionSuffix>preview1</VersionSuffix>
+    <!-- <PackageValidationBaselineVersion>4.0.0</PackageValidationBaselineVersion> -->
+    <Nullable>enable</Nullable>
+    <AssemblyCLSCompliant>false</AssemblyCLSCompliant>
+    <GenerateNupkgReadmeFileDependsOnTargets>$(GenerateNupkgReadmeFileDependsOnTargets);GenerateReadmeFileContent</GenerateNupkgReadmeFileDependsOnTargets>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <MeCabMakefileDirectory>$(MSBuildThisFileDirectory)..\MeCab\</MeCabMakefileDirectory>
+    <MeCabBindingsDirectory>$(MSBuildThisFileDirectory)..\MeCab\mecab-bindings\</MeCabBindingsDirectory>
+    <MeCabIpaDicDirectory>$(MSBuildThisFileDirectory)..\MeCab\mecab\mecab-ipadic\</MeCabIpaDicDirectory>
+    <MeCabDeploymentBasePath>mecab\</MeCabDeploymentBasePath>
+    <MeCabIpaDicDeploymentBasePath>$(MeCabDeploymentBasePath)dic\ipadic\</MeCabIpaDicDeploymentBasePath>
+  </PropertyGroup>
+
+  <PropertyGroup Label="assembly attributes">
+    <Description>A text conversion library that provides translation features from Japanese to Ondulish.</Description>
+    <CopyrightYear>2012</CopyrightYear>
+  </PropertyGroup>
+
+  <PropertyGroup Label="package properties">
+    <PackageTags>joke;funny;text-converter;translator</PackageTags>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Smdn.Fundamental.Csv" Version="[3.1.0,4.0.0)" />
+    <PackageReference Include="Smdn.Fundamental.String.Replacement" Version="[3.0.2,4.0.0)" />
+    <ProjectReference
+      Include="$(MSBuildThisFileDirectory)..\Smdn.Text.Ondulish.Dictionaries\Smdn.Text.Ondulish.Dictionaries.csproj"
+      VersionRange="[4.0.0,5.0.0)"
+      AdditionalProperties="IsBuildDueToProjectReference=true"
+    />
+  </ItemGroup>
+
+  <ItemGroup>
+    <!-- Third party notice -->
+    <None
+      Include="$(MSBuildThisFileDirectory)..\..\ThirdPartyNotices.md"
+      Pack="true"
+      PackagePath="ThirdPartyNotices.md"
+      CopyToOutputDirectory="None"
+    />
+
+    <!-- MeCab bindings source -->
+    <!--
+      These files will be added by MeCab.targets during the MSBuild execution phase.
+      <Compile Include="$(MeCabBindingsDirectory)src\*.cs" />
+    -->
+
+    <!-- MeCab shared library -->
+    <None
+      Include="$(MeCabBindingsDirectory)runtimes\ubuntu.22.04-x64\native\libmecab.so"
+      Pack="true"
+      PackagePath="runtimes\ubuntu.22.04-x64\native\libmecab.so"
+      CopyToOutputDirectory="PreserveNewest"
+    />
+
+    <!-- MeCab IPA dictionary files -->
+    <Content Include="$(MeCabIpaDicDirectory)char.bin" />
+    <Content Include="$(MeCabIpaDicDirectory)dicrc" />
+    <Content Include="$(MeCabIpaDicDirectory)left-id.def" />
+    <Content Include="$(MeCabIpaDicDirectory)matrix.bin" />
+    <Content Include="$(MeCabIpaDicDirectory)pos-id.def" />
+    <Content Include="$(MeCabIpaDicDirectory)rewrite.def" />
+    <Content Include="$(MeCabIpaDicDirectory)right-id.def" />
+    <Content Include="$(MeCabIpaDicDirectory)sys.dic" />
+    <Content Include="$(MeCabIpaDicDirectory)unk.dic" />
+
+    <Content
+      Update="$(MeCabIpaDicDirectory)*"
+      TargetPath="$(MeCabIpaDicDeploymentBasePath)$([System.IO.Path]::GetFileName('%(Identity)'))"
+      CopyToOutputDirectory="PreserveNewest"
+      Pack="true"
+      PackagePath="contentFiles\any\any\$([System.IO.Path]::TrimEndingDirectorySeparator('$(MeCabIpaDicDeploymentBasePath)'))"
+      PackageCopyToOutput="true"
+    />
+
+    <!-- MeCab configuration file -->
+    <Content
+      Include="null.mecabrc"
+      TargetPath="$(MeCabDeploymentBasePath)%(Filename)%(Extension)"
+      CopyToOutputDirectory="PreserveNewest"
+      Pack="true"
+      PackagePath="contentFiles\any\any\$([System.IO.Path]::TrimEndingDirectorySeparator('$(MeCabDeploymentBasePath)'))"
+      PackageCopyToOutput="true"
+    />
+  </ItemGroup>
+
+  <Target Name="GenerateReadmeFileContent">
+    <ItemGroup>
+      <_SupportedRuntimeIdentifier Include="$(RuntimeIdentifiers)" />
+      <_SupportedRuntimeIdentifierMarkdownList Include="- `%(_SupportedRuntimeIdentifier.Identity)`" />
+    </ItemGroup>
+
+    <PropertyGroup>
+      <PackageReadmeFileContent><![CDATA[# $(AssemblyName)-$(InformationalVersion)
+$(Description)
+
+## Usage
+```cs
+$([System.IO.File]::ReadAllText('$(MSBuildThisFileDirectory)..\..\examples\hello-ondulish-world\Program.cs'))
+```
+
+## MeCab bindings for .NET
+This package includes [MeCab](https://github.com/taku910/mecab.git) bindings for .NET and supports the platforms represented by the following [RID](https://learn.microsoft.com/dotnet/core/rid-catalog)s.
+@(_SupportedRuntimeIdentifierMarkdownList, '%0A')
+
+For other platforms, a wrapper library for the bindings must be built and deployed separately.
+]]></PackageReadmeFileContent>
+    </PropertyGroup>
+
+    <!-- append licence notice to package readme -->
+    <PropertyGroup>
+      <ThirdPartyNoticesMarkdownText>$([System.IO.File]::ReadAllText('$(MSBuildThisFileDirectory)..\..\ThirdPartyNotices.md'))</ThirdPartyNoticesMarkdownText>
+      <PackageReadmeFileContentPostamble>$(PackageReadmeFileContentPostamble)$(ThirdPartyNoticesMarkdownText)</PackageReadmeFileContentPostamble>
+    </PropertyGroup>
+  </Target>
+
+  <ImportGroup>
+    <Import Project="$(MSBuildThisFileDirectory)MeCab.targets" />
+  </ImportGroup>
+
+</Project>
diff --git a/src/Smdn.Text.Ondulish/Smdn.Text.Ondulish/KanaUtils.cs b/src/Smdn.Text.Ondulish/Smdn.Text.Ondulish/KanaUtils.cs
new file mode 100644
index 0000000..2092ef7
--- /dev/null
+++ b/src/Smdn.Text.Ondulish/Smdn.Text.Ondulish/KanaUtils.cs
@@ -0,0 +1,114 @@
+// SPDX-FileCopyrightText: 2012 smdn <smdn@smdn.jp>
+// SPDX-License-Identifier: MIT
+
+using System;
+using System.Text;
+
+namespace Smdn.Text.Ondulish;
+
+public static class KanaUtils {
+  private const char WideHiraganaStart = '\u3041';
+  private const char WideHiraganaEnd = '\u3096';
+
+  private const char WideKatakanaStart = '\u30a1';
+  private const char WideKatakanaEnd = '\u30f6';
+
+  private const int OffsetFromHiraganaToKatakana = WideKatakanaStart - WideHiraganaStart;
+
+  private const char WideKatakanaExEnd = '\u30fa';
+
+  private static readonly string[] WideToNarrowKatakanaMap = new[] {
+    "ｧ", "ｱ", "ｨ", "ｲ", "ｩ", "ｳ", "ｪ", "ｴ", "ｫ", "ｵ", "ｶ", "ｶﾞ", "ｷ", "ｷﾞ", "ｸ",               // 30A1 - 30AF
+    "ｸﾞ", "ｹ", "ｹﾞ", "ｺ", "ｺﾞ", "ｻ", "ｻﾞ", "ｼ", "ｼﾞ", "ｽ", "ｽﾞ", "ｾ", "ｾﾞ", "ｿ", "ｿﾞ", "ﾀ",    // 30B0 - 30BF
+    "ﾀﾞ", "ﾁ", "ﾁﾞ", "ｯ", "ﾂ", "ﾂﾞ", "ﾃ", "ﾃﾞ", "ﾄ", "ﾄﾞ", "ﾅ", "ﾆ", "ﾇ", "ﾈ", "ﾉ", "ﾊ",       // 30C0 - 30CF
+    "ﾊﾞ", "ﾊﾟ", "ﾋ", "ﾋﾞ", "ﾋﾟ", "ﾌ", "ﾌﾞ", "ﾌﾟ", "ﾍ", "ﾍﾞ", "ﾍﾟ", "ﾎ", "ﾎﾞ", "ﾎﾟ", "ﾏ", "ﾐ",  // 30D0 - 30DF
+    "ﾑ", "ﾒ", "ﾓ", "ｬ", "ﾔ", "ｭ", "ﾕ", "ｮ", "ﾖ", "ﾗ", "ﾘ", "ﾙ", "ﾚ", "ﾛ", "ヮ", "ﾜ",           // 30E0 - 30EF
+    "ヰ", "ヱ", "ｦ", "ﾝ", "ｳﾞ", "ヵ", "ヶ", "ﾜﾞ", "ヸ", "ヹ", "ｦﾞ", // 30F0 - 30FA
+  };
+
+  public static string ConvertWideHiraganaToKatakana(string input)
+  {
+    if (input is null)
+      throw new ArgumentNullException(nameof(input));
+    if (input.Length == 0)
+      return string.Empty;
+
+#if SYSTEM_STRING_CREATE
+    return string.Create(input.Length, input, static (chars, s) => {
+      for (var index = 0; index < chars.Length; index++) {
+        chars[index] = s[index] is >= WideHiraganaStart and <= WideHiraganaEnd
+          ? (char)(s[index] + OffsetFromHiraganaToKatakana)
+          : s[index];
+      }
+    });
+#else
+    var outputChars = new char[input.Length];
+
+    for (var index = 0; index < input.Length; index++) {
+      outputChars[index] = input[index] is >= WideHiraganaStart and <= WideHiraganaEnd
+        ? (char)(input[index] + OffsetFromHiraganaToKatakana)
+        : outputChars[index] = input[index];
+    }
+
+    return new string(outputChars);
+#endif
+  }
+
+  public static string ConvertWideKatakanaToHiragana(string input)
+  {
+    if (input is null)
+      throw new ArgumentNullException(nameof(input));
+    if (input.Length == 0)
+      return string.Empty;
+
+#if SYSTEM_STRING_CREATE
+    return string.Create(input.Length, input, static (chars, s) => {
+      for (var index = 0; index < chars.Length; index++) {
+        chars[index] = s[index] is >= WideKatakanaStart and <= WideKatakanaEnd
+          ? (char)(s[index] - OffsetFromHiraganaToKatakana)
+          : s[index];
+      }
+    });
+#else
+    var outputChars = new char[input.Length];
+
+    for (var index = 0; index < input.Length; index++) {
+      outputChars[index] = input[index] is >= WideKatakanaStart and <= WideKatakanaEnd
+        ? (char)(input[index] - OffsetFromHiraganaToKatakana)
+        : input[index];
+    }
+
+    return new string(outputChars);
+#endif
+  }
+
+  public static string ConvertWideKatakanaToNarrowKatakana(string input)
+  {
+    if (input is null)
+      throw new ArgumentNullException(nameof(input));
+    if (input.Length == 0)
+      return string.Empty;
+
+    var output = new StringBuilder(input.Length * 2);
+
+    for (var index = 0; index < input.Length; index++) {
+      output.Append(
+        input[index] switch {
+          >= WideKatakanaStart and <= WideKatakanaExEnd => WideToNarrowKatakanaMap[input[index] - WideKatakanaStart],
+          'ー' => 'ｰ',
+          '゛' => 'ﾞ',
+          '゜' => 'ﾟ',
+          '？' => '?',
+          '！' => '!',
+          '、' => '､',
+          '。' => '｡',
+          '，' => ',',
+          '．' => '.',
+          _ => input[index],
+        }
+      );
+    }
+
+    return output.ToString();
+  }
+}
diff --git a/src/Smdn.Text.Ondulish/Smdn.Text.Ondulish/ReadOnlyOrderedDictionary.cs b/src/Smdn.Text.Ondulish/Smdn.Text.Ondulish/ReadOnlyOrderedDictionary.cs
new file mode 100644
index 0000000..6519550
--- /dev/null
+++ b/src/Smdn.Text.Ondulish/Smdn.Text.Ondulish/ReadOnlyOrderedDictionary.cs
@@ -0,0 +1,43 @@
+// SPDX-FileCopyrightText: 2012 smdn <smdn@smdn.jp>
+// SPDX-License-Identifier: MIT
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Smdn.Text.Ondulish;
+
+internal sealed class ReadOnlyOrderedDictionary<TKey, TValue> : IReadOnlyDictionary<TKey, TValue> {
+  private readonly IReadOnlyList<KeyValuePair<TKey, TValue>> dictionary;
+
+  public TValue this[TKey key] => throw new NotImplementedException();
+  public IEnumerable<TKey> Keys => throw new NotImplementedException();
+  public IEnumerable<TValue> Values => throw new NotImplementedException();
+  public int Count => dictionary.Count;
+
+  public ReadOnlyOrderedDictionary(IEnumerable<(TKey Key, TValue Value)> dictionary)
+    : this(
+      (dictionary ?? throw new ArgumentNullException(nameof(dictionary)))
+      .Select(static pair => new KeyValuePair<TKey, TValue>(pair.Key, pair.Value))
+      .ToList()
+    )
+  { }
+
+  public ReadOnlyOrderedDictionary(IReadOnlyList<KeyValuePair<TKey, TValue>> dictionary)
+  {
+    this.dictionary = dictionary ?? throw new ArgumentNullException(nameof(dictionary));
+  }
+
+  public bool ContainsKey(TKey key)
+    => throw new NotImplementedException();
+
+  public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator()
+    => dictionary.GetEnumerator();
+
+  public bool TryGetValue(TKey key, out TValue value)
+    => throw new NotImplementedException();
+
+  IEnumerator IEnumerable.GetEnumerator()
+    => dictionary.GetEnumerator();
+}
diff --git a/src/Smdn.Text.Ondulish/Smdn.Text.Ondulish/Translator.Dictionaries.cs b/src/Smdn.Text.Ondulish/Smdn.Text.Ondulish/Translator.Dictionaries.cs
new file mode 100644
index 0000000..7c82c31
--- /dev/null
+++ b/src/Smdn.Text.Ondulish/Smdn.Text.Ondulish/Translator.Dictionaries.cs
@@ -0,0 +1,127 @@
+// SPDX-FileCopyrightText: 2012 smdn <smdn@smdn.jp>
+// SPDX-License-Identifier: MIT
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+
+using Smdn.Formats.Csv;
+
+namespace Smdn.Text.Ondulish;
+
+#pragma warning disable IDE0040
+partial class Translator {
+#pragma warning restore IDE0040
+
+  public IReadOnlyDictionary<string, string> PhraseDictionary { get; }
+  public IReadOnlyDictionary<string, string> WordDictionary { get; }
+
+  private sealed class WordDictionaryComparer : IComparer<string> {
+    public int Compare(string? x, string? y)
+    {
+      x ??= string.Empty;
+      y ??= string.Empty;
+
+      return x.Length == y.Length
+        ? StringComparer.Ordinal.Compare(x, y)
+        : y.Length - x.Length;
+    }
+  }
+
+  private static readonly char[] dictionaryPunctuationChars = new[] { '！', '？', '!', '?', '、', '。' };
+
+  private static SortedList<string, string> LoadDictionary(Stream stream)
+  {
+    var dictionary = new SortedList<string, string>(new WordDictionaryComparer());
+
+    using var reader = new CsvReader(stream, Encoding.UTF8);
+
+    foreach (var entries in reader.ReadRecords()) {
+      if (entries.Count < 3)
+        continue;
+
+      var entry = entries[0].Trim();
+
+      if (entry.StartsWith('#'))
+        continue; // comment line
+
+      var key = entries[1].Trim().RemoveChars(dictionaryPunctuationChars);
+
+      dictionary[KanaUtils.ConvertWideHiraganaToKatakana(key)] = entries[2].Trim();
+    }
+
+    return dictionary;
+  }
+
+  private static readonly IReadOnlyDictionary<string, string> phonemeDictionary =
+    new ReadOnlyOrderedDictionary<string, string>(
+      new[] {
+        // 最優先
+        ("ル", "ドゥ"),
+        ("ム", "ヴ"),
+        ("ボー", "ポッ"),
+        ("ドー", "ドゥー"),
+        ("スナ", "スダ"),
+        ("スルナ", "ドゥルダ"),
+        ("スル", "ドゥル"),
+        ("デモ", "デロ"),
+        ("ンヤ", "ッニャ"),
+        ("ネイ", "ニッ"),
+        ("ネエ", "ニェ"),
+        ("デス", "ディス"),
+        ("ウラ", "ルラ"),
+        ("トオ", "ドーゥ"),
+        ("いじゃ", "チョナ"),
+        ("とは", "トヴァ"),
+
+        // 母音
+        ("ア", "ア゛"),
+        ("ウ", "ル"),
+        ("ヤ", "ャ"),
+
+        // 摩擦音
+        ("サ", "ザァ"),
+        ("ス", "ズ"),
+        ("ゼ", "デ"),
+
+        ("ハ", "ヴァ"),
+        ("ヒ", "ビィ"),
+        ("フ", "ヴ"),
+        ("ヘ", "ベ"),
+        ("ホ", "ボ"),
+
+        ("ブ", "ム"),
+
+        ("ゼ", "デ"),
+
+        // 破裂音
+        ("ク", "グ"),
+        ("キ", "ク"),
+
+        ("タ", "ダ"),
+        ("チ", "ディ"),
+        ("ツ", "ヅ"),
+        ("テ", "デ"),
+        ("ト", "ドゥ"),
+
+        ("ピ", "ヴィ"),
+
+        // 鼻音
+        ("ニ", "ディ"),
+        ("ヌ", "ズ"),
+        ("ネ", "ベ"),
+        ("ノ", "ド"),
+
+        ("マ", "バ"),
+        ("ミ", "ヴィ"),
+        ("メ", "ベ"),
+        ("モ", "ボ"),
+
+        // 流音
+        ("リ", "ディ"),
+        ("レ", "リ"),
+        ("ロ", "ド"),
+      }
+    );
+}
diff --git a/src/Smdn.Text.Ondulish/Smdn.Text.Ondulish/Translator.cs b/src/Smdn.Text.Ondulish/Smdn.Text.Ondulish/Translator.cs
new file mode 100644
index 0000000..6f87100
--- /dev/null
+++ b/src/Smdn.Text.Ondulish/Smdn.Text.Ondulish/Translator.cs
@@ -0,0 +1,285 @@
+// SPDX-FileCopyrightText: 2012 smdn <smdn@smdn.jp>
+// SPDX-License-Identifier: MIT
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+
+using MeCab;
+
+using MeCabConsts = MeCab.MeCab;
+
+namespace Smdn.Text.Ondulish;
+
+public partial class Translator : IDisposable {
+  private const string MeCabDeploymentDirectory = "mecab";
+  private const bool ConvertKatakanaToNarrowDefaultValue = true;
+
+  private Tagger? tagger;
+  private readonly bool shouldDisposeTagger;
+
+  private void ThrowIfDisposed()
+  {
+    if (tagger is null)
+      throw new ObjectDisposedException(GetType().FullName);
+  }
+
+  public static Tagger CreateTaggerForBundledDictionary()
+  {
+    var assemblyDirectory = System.IO.Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
+    var mecabDeploymentDirectoryPath = string.IsNullOrEmpty(assemblyDirectory)
+      ? MeCabDeploymentDirectory // fallback: use relative path from current directory
+      : System.IO.Path.Join(assemblyDirectory, MeCabDeploymentDirectory);
+
+    var pathToMeCabResourceFile = System.IO.Path.Join(mecabDeploymentDirectoryPath, "null.mecabrc");
+    var pathToMeCabDictionaryDirectory = System.IO.Path.Join(mecabDeploymentDirectoryPath, "dic", "ipadic");
+
+    var taggerArgs = $"-r {pathToMeCabResourceFile} -d {pathToMeCabDictionaryDirectory}";
+
+    return new Tagger(taggerArgs);
+  }
+
+  public Translator()
+    : this(
+      tagger: CreateTaggerForBundledDictionary(),
+      shouldDisposeTagger: true
+    )
+  {
+  }
+
+  public Translator(
+    Tagger tagger,
+    bool shouldDisposeTagger
+  )
+  {
+    if (tagger is null)
+      throw new ArgumentNullException(nameof(tagger));
+
+    this.tagger = tagger;
+    this.shouldDisposeTagger = shouldDisposeTagger;
+
+    // load Ondulish dictionaries from assembly Smdn.Text.Ondulish.Dictionaries
+    try {
+      using var stream = OndulishDictionaries.OpenPhraseDictionaryStream();
+
+      PhraseDictionary = LoadDictionary(stream);
+    }
+    catch {
+      // ignore exceptions
+      PhraseDictionary = CreateEmptyDictionary();
+    }
+
+    try {
+      using var stream = OndulishDictionaries.OpenWordDictionaryStream();
+
+      WordDictionary = LoadDictionary(stream);
+    }
+    catch {
+      // ignore exceptions
+      WordDictionary = CreateEmptyDictionary();
+    }
+
+    static IReadOnlyDictionary<string, string> CreateEmptyDictionary()
+      => Enumerable.Empty<(string Key, string Value)>().ToDictionary(static pair => pair.Key, static pair => pair.Value);
+  }
+
+  public void Dispose()
+  {
+    Dispose(disposing: true);
+    GC.SuppressFinalize(this);
+  }
+
+  protected virtual void Dispose(bool disposing)
+  {
+    if (shouldDisposeTagger && tagger is not null)
+      tagger.Dispose();
+
+    tagger = null;
+  }
+
+  public string Translate(
+    string input,
+    bool convertKatakanaToNarrow = ConvertKatakanaToNarrowDefaultValue
+  )
+  {
+    if (input is null)
+      throw new ArgumentNullException(nameof(input));
+
+    ThrowIfDisposed();
+
+    if (input.Length == 0)
+      return string.Empty;
+
+    var sb = new StringBuilder(input.Length * 2);
+
+    Translate(
+      input: new StringReader(input),
+      output: new StringWriter(sb),
+      convertKatakanaToNarrow: convertKatakanaToNarrow
+    );
+
+    return sb.ToString();
+  }
+
+  public void Translate(
+    string input,
+    TextWriter output,
+    bool convertKatakanaToNarrow = ConvertKatakanaToNarrowDefaultValue
+  )
+    => Translate(
+      input: new StringReader(input ?? throw new ArgumentNullException(nameof(input))),
+      output: output ?? throw new ArgumentNullException(nameof(output)),
+      convertKatakanaToNarrow: convertKatakanaToNarrow
+    );
+
+  public void Translate(
+    TextReader input,
+    TextWriter output,
+    bool convertKatakanaToNarrow = ConvertKatakanaToNarrowDefaultValue
+  )
+  {
+    if (input is null)
+      throw new ArgumentNullException(nameof(input));
+    if (output is null)
+      throw new ArgumentNullException(nameof(output));
+
+    ThrowIfDisposed();
+
+    var firstLine = true;
+
+    for (var line = input.ReadLine(); line is not null; line = input.ReadLine()) {
+      if (firstLine)
+        firstLine = false;
+      else
+        output.WriteLine();
+
+      if (string.IsNullOrWhiteSpace(line)) {
+        output.Write(line);
+        continue;
+      }
+
+      var fragments =
+        ConvertWithDictionary(
+          ConvertToKatakana(line),
+          PhraseDictionary
+        )
+        .SelectMany(f =>
+          f.ConvertedText is null
+            ? ConvertWithDictionary(f.SourceText, WordDictionary)
+            : Enumerable.Repeat(f, 1)
+        )
+        .SelectMany(f =>
+          f.ConvertedText is null
+            ? ConvertWithDictionary(f.SourceText, phonemeDictionary)
+            : Enumerable.Repeat(f, 1)
+        )
+        .Select(static f =>
+          new TextFragment(
+            f.SourceText,
+            f.ConvertedText ?? KanaUtils.ConvertWideHiraganaToKatakana(f.SourceText) // redundant?
+          )
+        );
+
+      if (convertKatakanaToNarrow) {
+        fragments = fragments.Select(static f =>
+          new TextFragment(
+            f.SourceText,
+            f.ConvertedText is null
+              ? null
+              : KanaUtils.ConvertWideKatakanaToNarrowKatakana(f.ConvertedText)
+          )
+        );
+      }
+
+      foreach (var fragment in fragments) {
+        output.Write(fragment.ConvertedText);
+      }
+    }
+
+    output.Flush();
+  }
+
+  private static readonly char[] featureSplitter = new[] { ',' };
+
+  private string ConvertToKatakana(string input)
+  {
+    input = input.Replace(",", "，"); // XXX: feature splitter
+
+    var ret = new StringBuilder(input.Length * 2);
+
+    for (var node = tagger!.parseToNode(input); node != null; node = node.next) {
+      if (node.stat == MeCabConsts.MECAB_BOS_NODE || node.stat == MeCabConsts.MECAB_EOS_NODE)
+        continue;
+
+      var featureEntries = node.feature.Split(featureSplitter);
+
+      if (8 <= featureEntries.Length) {
+        switch (featureEntries[6]) {
+          case "ぶっ殺す": ret.Append("ブッコロス"); break; // ipadic says 'ぶっとばす'
+          default: ret.Append(featureEntries[7]); break;
+        }
+      }
+      else {
+        ret.Append(node.surface);
+      }
+    }
+
+    return ret.ToString();
+  }
+
+  private readonly struct TextFragment {
+    public readonly string SourceText;
+    public readonly string? ConvertedText;
+
+    public TextFragment(string sourceText, string? convertedText)
+    {
+      SourceText = sourceText;
+      ConvertedText = convertedText;
+    }
+  }
+
+  private static bool FindMostLeftAndLongestCandidate(
+    string input,
+    int startIndex,
+    IReadOnlyDictionary<string, string> dictionary,
+    out int position,
+    out KeyValuePair<string, string> candidate
+  )
+  {
+    position = int.MaxValue;
+    candidate = default;
+
+    foreach (var entry in dictionary) {
+      var pos = input.IndexOf(entry.Key, startIndex, StringComparison.Ordinal);
+
+      if (0 <= pos && pos < position) {
+        position = pos;
+        candidate = entry;
+      }
+    }
+
+    return position != int.MaxValue;
+  }
+
+  private static IEnumerable<TextFragment> ConvertWithDictionary(
+    string input,
+    IReadOnlyDictionary<string, string> dictionary
+  )
+  {
+    var offset = 0;
+
+    while (FindMostLeftAndLongestCandidate(input, offset, dictionary, out var position, out var candidate)) {
+      if (offset < position)
+        yield return new TextFragment(input.Substring(offset, position - offset), null);
+
+      yield return new TextFragment(candidate.Key, candidate.Value);
+
+      offset = position + candidate.Key.Length;
+    }
+
+    yield return new TextFragment(input.Substring(offset), null);
+  }
+}
diff --git a/src/Smdn.Text.Ondulish/null.mecabrc b/src/Smdn.Text.Ondulish/null.mecabrc
new file mode 100644
index 0000000..e69de29

Notes

What's Changed

• Release main/Smdn.Text.Ondulish-4.0.0-preview1 by @smdn in #2

Full Changelog: releases/Smdn.Text.Ondulish.Dictionaries-4.0.0-preview1...releases/Smdn.Text.Ondulish-4.0.0-preview1