convert Resolver to struct (#229)

convert Resolver to struct
merged-on-behalf-of: Basile-z <Basile-z@users.noreply.github.com>

examples/resolver/main.d

@@ -12,12 +12,10 @@ int main(string[] args)
 
     try
     {
-        auto resolver = new Resolver;
-        resolver.addImplicitResolver("!color", regex("[0-9a-fA-F]{6}"),
-            "0123456789abcdefABCDEF");
 
         auto loader = Loader.fromFile("input.yaml");
-        loader.resolver = resolver;
+        loader.resolver.addImplicitResolver("!color", regex("[0-9a-fA-F]{6}"),
+            "0123456789abcdefABCDEF");
 
         auto root = loader.load();
 

examples/yaml_bench/yaml_bench.d

@@ -101,7 +101,7 @@ void main(string[] args) //@safe
     {
         // Instead of constructing a resolver/constructor with each Loader,
         // construct them once to remove noise when profiling.
-        auto resolver    = new Resolver();
+        auto resolver    = Resolver.withDefaultResolvers;
 
         auto constructTime = stopWatch.peek();
 

source/dyaml/composer.d

@@ -79,7 +79,6 @@ struct Composer
         pure @safe nothrow ~this()
         {
             parser_ = null;
-            resolver_ = null;
             anchors_.destroy();
             anchors_ = null;
         }

source/dyaml/dumper.d

@@ -99,7 +99,7 @@ struct Dumper(Range)
          */
         this(Range stream) @safe
         {
-            resolver_    = new Resolver();
+            resolver_    = Resolver.withDefaultResolvers;
             stream_ = stream;
         }
 
@@ -110,9 +110,9 @@ struct Dumper(Range)
         }
 
         ///Specify custom Resolver to use.
-        @property void resolver(Resolver resolver) @safe
+        auto ref resolver() @safe
         {
-            resolver_ = resolver;
+            return resolver_;
         }
 
         ///Write scalars in _canonical form?
@@ -290,10 +290,10 @@ struct Dumper(Range)
 ///Use a custom resolver to support custom data types and/or implicit tags
 @safe unittest
 {
+    import std.regex : regex;
     auto node = Node([1, 2, 3, 4, 5]);
-    auto resolver = new Resolver();
     auto dumper = dumper(new Appender!string());
-    dumper.resolver = resolver;
+    dumper.resolver.addImplicitResolver("!tag", regex("A.*"), "A");
     dumper.dump(node);
 }
 /// Set default scalar style

source/dyaml/loader.d

@@ -149,6 +149,7 @@ struct Loader
         /// Ditto
         private this(ubyte[] yamlData) @safe
         {
+            resolver_ = Resolver.withDefaultResolvers;
             try
             {
                 reader_      = new Reader(yamlData);
@@ -170,9 +171,9 @@ struct Loader
         }
 
         /// Specify custom Resolver to use.
-        void resolver(Resolver resolver) pure @safe nothrow @nogc
+        auto ref resolver() pure @safe nothrow @nogc
         {
-            resolver_ = resolver;
+            return resolver_;
         }
 
         /** Load single YAML document.
@@ -221,7 +222,6 @@ struct Loader
             static Composer composer;
             if (!rangeInitialized)
             {
-                lazyInitConstructorResolver();
                 composer = Composer(parser_, resolver_);
                 rangeInitialized = true;
             }
@@ -290,13 +290,6 @@ struct Loader
         {
             return parser_;
         }
-
-        // Construct default constructor/resolver if the user has not yet specified
-        // their own.
-        void lazyInitConstructorResolver() @safe
-        {
-            if(resolver_ is null)    { resolver_    = new Resolver(); }
-        }
 }
 /// Load single YAML document from a file:
 @safe unittest
@@ -394,7 +387,7 @@ struct Loader
         writeln("Failed to read file 'example.yaml'");
     }
 }
-/// Use a custom constructor/resolver to support custom data types and/or implicit tags:
+/// Use a custom resolver to support custom data types and/or implicit tags:
 @safe unittest
 {
     import std.file : write;
@@ -404,11 +397,11 @@ struct Loader
         "Hello world!\n"~
         "...\n"
     );
-    auto resolver = new Resolver();
-
-    // Add constructor functions / resolver expressions here...
 
     auto loader = Loader.fromFile("example.yaml");
-    loader.resolver = resolver;
+
+    // Add resolver expressions here...
+    // loader.resolver.addImplicitResolver(...);
+
     auto rootNode = loader.load();
 }

source/dyaml/resolver.d

@@ -24,12 +24,53 @@ import dyaml.node;
 import dyaml.exception;
 
 
+static Tuple!(string, "tag", Regex!char, "regexp", string, "chars")[] regexes;
+
+static this() @safe {
+    regexes ~= tuple!("tag", "regexp", "chars")("tag:yaml.org,2002:bool",
+                        regex(r"^(?:yes|Yes|YES|no|No|NO|true|True|TRUE" ~
+                               "|false|False|FALSE|on|On|ON|off|Off|OFF)$"),
+                        "yYnNtTfFoO");
+    regexes ~= tuple!("tag", "regexp", "chars")("tag:yaml.org,2002:float",
+                        regex(r"^(?:[-+]?([0-9][0-9_]*)\\.[0-9_]*" ~
+                              "(?:[eE][-+][0-9]+)?|[-+]?(?:[0-9][0-9_]" ~
+                              "*)?\\.[0-9_]+(?:[eE][-+][0-9]+)?|[-+]?" ~
+                              "[0-9][0-9_]*(?::[0-5]?[0-9])+\\.[0-9_]" ~
+                              "*|[-+]?\\.(?:inf|Inf|INF)|\\." ~
+                              "(?:nan|NaN|NAN))$"),
+                        "-+0123456789.");
+    regexes ~= tuple!("tag", "regexp", "chars")("tag:yaml.org,2002:int",
+                        regex(r"^(?:[-+]?0b[0-1_]+" ~
+                               "|[-+]?0[0-7_]+" ~
+                               "|[-+]?(?:0|[1-9][0-9_]*)" ~
+                               "|[-+]?0x[0-9a-fA-F_]+" ~
+                               "|[-+]?[1-9][0-9_]*(?::[0-5]?[0-9])+)$"),
+                        "-+0123456789");
+    regexes ~= tuple!("tag", "regexp", "chars")("tag:yaml.org,2002:merge", regex(r"^<<$"), "<");
+    regexes ~= tuple!("tag", "regexp", "chars")("tag:yaml.org,2002:null",
+                        regex(r"^$|^(?:~|null|Null|NULL)$"), "~nN\0");
+    regexes ~= tuple!("tag", "regexp", "chars")("tag:yaml.org,2002:timestamp",
+                        regex(r"^[0-9][0-9][0-9][0-9]-[0-9][0-9]-" ~
+                               "[0-9][0-9]|[0-9][0-9][0-9][0-9]-[0-9]" ~
+                               "[0-9]?-[0-9][0-9]?[Tt]|[ \t]+[0-9]" ~
+                               "[0-9]?:[0-9][0-9]:[0-9][0-9]" ~
+                               "(?:\\.[0-9]*)?(?:[ \t]*Z|[-+][0-9]" ~
+                               "[0-9]?(?::[0-9][0-9])?)?$"),
+                        "0123456789");
+    regexes ~= tuple!("tag", "regexp", "chars")("tag:yaml.org,2002:value", regex(r"^=$"), "=");
+
+
+    //The following resolver is only for documentation purposes. It cannot work
+    //because plain scalars cannot start with '!', '&', or '*'.
+    regexes ~= tuple!("tag", "regexp", "chars")("tag:yaml.org,2002:yaml", regex(r"^(?:!|&|\*)$"), "!&*");
+}
+
 /**
  * Resolves YAML tags (data types).
  *
  * Can be used to implicitly resolve custom data types of scalar values.
  */
-final class Resolver
+struct Resolver
 {
     private:
         // Default tag to use for scalars.
@@ -47,24 +88,21 @@ final class Resolver
          */
         Tuple!(string, Regex!char)[][dchar] yamlImplicitResolvers_;
 
+    package:
+        static auto withDefaultResolvers() @safe
+        {
+            Resolver resolver;
+            foreach(pair; regexes)
+            {
+                resolver.addImplicitResolver(pair.tag, pair.regexp, pair.chars);
+            }
+            return resolver;
+        }
+
     public:
         @disable bool opEquals(ref Resolver);
         @disable int opCmp(ref Resolver);
 
-        /**
-         * Construct a Resolver.
-         *
-         * If you don't want to implicitly resolve default YAML tags/data types,
-         * you can use defaultImplicitResolvers to disable default resolvers.
-         *
-         * Params:  defaultImplicitResolvers = Use default YAML implicit resolvers?
-         */
-        this(Flag!"useDefaultImplicitResolvers" defaultImplicitResolvers = Yes.useDefaultImplicitResolvers)
-            @safe
-        {
-            if(defaultImplicitResolvers){addImplicitResolvers();}
-        }
-
         /**
          * Add an implicit scalar resolver.
          *
@@ -105,9 +143,7 @@ final class Resolver
             write("example.yaml", "A");
 
             auto loader = Loader.fromFile("example.yaml");
-            auto resolver = new Resolver();
+            loader.resolver.addImplicitResolver("!tag", regex("A.*"), "A");
-            resolver.addImplicitResolver("!tag", regex("A.*"), "A");
-            loader.resolver = resolver;
 
             auto node = loader.load();
             assert(node.tag == "!tag");
@@ -169,7 +205,7 @@ final class Resolver
         }
         @safe unittest
         {
-            auto resolver = new Resolver();
+            auto resolver = Resolver.withDefaultResolvers;
 
             bool tagMatch(string tag, string[] values) @safe
             {
@@ -215,46 +251,4 @@ final class Resolver
 
         ///Returns: Default mapping tag.
         @property string defaultMappingTag()  const pure @safe nothrow {return defaultMappingTag_;}
-
-    private:
-        // Add default implicit resolvers.
-        void addImplicitResolvers() @safe
-        {
-            addImplicitResolver("tag:yaml.org,2002:bool",
-                                regex(r"^(?:yes|Yes|YES|no|No|NO|true|True|TRUE" ~
-                                       "|false|False|FALSE|on|On|ON|off|Off|OFF)$"),
-                                "yYnNtTfFoO");
-            addImplicitResolver("tag:yaml.org,2002:float",
-                                regex(r"^(?:[-+]?([0-9][0-9_]*)\\.[0-9_]*" ~
-                                      "(?:[eE][-+][0-9]+)?|[-+]?(?:[0-9][0-9_]" ~
-                                      "*)?\\.[0-9_]+(?:[eE][-+][0-9]+)?|[-+]?" ~
-                                      "[0-9][0-9_]*(?::[0-5]?[0-9])+\\.[0-9_]" ~
-                                      "*|[-+]?\\.(?:inf|Inf|INF)|\\." ~
-                                      "(?:nan|NaN|NAN))$"),
-                                "-+0123456789.");
-            addImplicitResolver("tag:yaml.org,2002:int",
-                                regex(r"^(?:[-+]?0b[0-1_]+" ~
-                                       "|[-+]?0[0-7_]+" ~
-                                       "|[-+]?(?:0|[1-9][0-9_]*)" ~
-                                       "|[-+]?0x[0-9a-fA-F_]+" ~
-                                       "|[-+]?[1-9][0-9_]*(?::[0-5]?[0-9])+)$"),
-                                "-+0123456789");
-            addImplicitResolver("tag:yaml.org,2002:merge", regex(r"^<<$"), "<");
-            addImplicitResolver("tag:yaml.org,2002:null",
-                                regex(r"^$|^(?:~|null|Null|NULL)$"), "~nN\0");
-            addImplicitResolver("tag:yaml.org,2002:timestamp",
-                                regex(r"^[0-9][0-9][0-9][0-9]-[0-9][0-9]-" ~
-                                       "[0-9][0-9]|[0-9][0-9][0-9][0-9]-[0-9]" ~
-                                       "[0-9]?-[0-9][0-9]?[Tt]|[ \t]+[0-9]" ~
-                                       "[0-9]?:[0-9][0-9]:[0-9][0-9]" ~
-                                       "(?:\\.[0-9]*)?(?:[ \t]*Z|[-+][0-9]" ~
-                                       "[0-9]?(?::[0-9][0-9])?)?$"),
-                                "0123456789");
-            addImplicitResolver("tag:yaml.org,2002:value", regex(r"^=$"), "=");
-
-
-            //The following resolver is only for documentation purposes. It cannot work
-            //because plain scalars cannot start with '!', '&', or '*'.
-            addImplicitResolver("tag:yaml.org,2002:yaml", regex(r"^(?:!|&|\*)$"), "!&*");
-        }
 }

source/dyaml/test/constructor.d

@@ -935,7 +935,6 @@ void testConstructor(string dataFilename, string codeDummy) @safe
             new Exception("Unimplemented constructor test: " ~ base));
 
     auto loader        = Loader.fromFile(dataFilename);
-    loader.resolver    = new Resolver;
 
     Node[] exp = expected[base];
 

source/dyaml/test/emitter.d

@@ -90,7 +90,6 @@ void testEmitterOnData(string dataFilename, string canonicalFilename) @safe
 
     auto loader2        = Loader.fromString(emitStream.data);
     loader2.name        = "TEST";
-    loader2.resolver    = new Resolver;
     auto newEvents = loader2.parse();
     assert(compareEvents(events, newEvents));
 }
@@ -118,7 +117,6 @@ void testEmitterOnCanonical(string canonicalFilename) @safe
         }
         auto loader2        = Loader.fromString(emitStream.data);
         loader2.name        = "TEST";
-        loader2.resolver    = new Resolver;
         auto newEvents = loader2.parse();
         assert(compareEvents(events, newEvents));
     }
@@ -175,7 +173,6 @@ void testEmitterStyles(string dataFilename, string canonicalFilename) @safe
                 }
                 auto loader2        = Loader.fromString(emitStream.data);
                 loader2.name        = "TEST";
-                loader2.resolver    = new Resolver;
                 auto newEvents = loader2.parse();
                 assert(compareEvents(events, newEvents));
             }