コード例 #1
0
        static void _BuildArticleImages()
        {
            // this generates the figures used in the code project article
            // at https://www.codeproject.com/Articles/5251476/How-to-Build-a-Regex-Engine-in-Csharp
            var litA = CharFA <string> .Literal("ABC", "Accept");

            litA.RenderToFile(@"..\..\..\literal.jpg");
            var litAa = CharFA <string> .CaseInsensitive(litA, "Accept");

            litAa.RenderToFile(@"..\..\..\literal_ci.jpg");
            var opt = CharFA <string> .Optional(litA, "Accept");

            opt.RenderToFile(@"..\..\..\optional.jpg");
            var litB = CharFA <string> .Literal("DEF");

            var or = CharFA <string> .Or(new CharFA <string>[] { litA, litB }, "Accept");

            or.RenderToFile(@"..\..\..\or.jpg");
            var set = CharFA <string> .Set("ABC", "Accept");

            set.RenderToFile(@"..\..\..\set.jpg");
            var loop = CharFA <string> .Repeat(litA, 1, -1, "Accept");

            loop.RenderToFile(@"..\..\..\repeat.jpg");
            var concat = CharFA <string> .Concat(new CharFA <string>[] { litA, litB }, "Accept");

            concat.RenderToFile(@"..\..\..\concat.jpg");
            var foobar = CharFA <string> .Or(new CharFA <string>[] { CharFA <string> .Literal("foo"), CharFA <string> .Literal("bar") }, "Accept");

            foobar.RenderToFile(@"..\..\..\foobar_nfa.jpg");
            var rfoobar = foobar.Reduce();

            rfoobar.RenderToFile(@"..\..\..\foobar.jpg");
            var lfoobar = CharFA <string> .Repeat(foobar, 1, -1, "Accept");

            lfoobar.RenderToFile(@"..\..\..\foobar_loop_nfa.jpg");
            var rlfoobar = lfoobar.Reduce();

            rlfoobar.RenderToFile(@"..\..\..\foobar_loop.jpg");

            var digits = CharFA <string> .Repeat(
                CharFA <string> .Set("0123456789"),
                1, -1
                , "Digits");

            var word = CharFA <string> .Repeat(
                CharFA <string> .Set(new CharRange[] { new CharRange('A', 'Z'), new CharRange('a', 'z') }),
                1, -1
                , "Word");

            var whitespace = CharFA <string> .Repeat(
                CharFA <string> .Set(" \t\r\n\v\f"),
                1, -1
                , "Whitespace");

            var lexer = CharFA <string> .ToLexer(digits, word, whitespace);

            lexer.RenderToFile(@"..\..\..\lexer.jpg");
            var dopt = new CharFA <string> .DotGraphOptions();

            dopt.DebugSourceNfa = lexer;
            var dlexer = lexer.ToDfa();

            dlexer.RenderToFile(@"..\..\..\dlexer.jpg", dopt
                                );
            dlexer.RenderToFile(@"..\..\..\dlexer2.jpg");
            var dom = RegexExpression.Parse("(ABC|DEF)+");
            var fa  = dom.ToFA("Accept");

            fa.RenderToFile(@"..\..\..\ABCorDEFloop.jpg");
        }