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Fix syntax for block helpers#358

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Merged
probot-auto-merge merged 3 commits into from
Nov 7, 2020
Merged

Fix syntax for block helpers #358

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e3bd448
Fix syntax for block helpers
Jun 23, 2020
12ce419
Update readme according to latest changes
oformaniuk Nov 7, 2020
26f4411
Add test to cover `RegisterBlockHelper` readme example
oformaniuk Nov 7, 2020
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19 changes: 11 additions & 8 deletions README.md
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Original file line numberDiff line numberDiff line change
Expand Up@@ -124,14 +124,17 @@ Views\{Controller}\{Action}\partials\somepartial.hbs
### Registering Block Helpers

```c#
Handlebars.RegisterHelper("StringEqualityBlockHelper", (TextWriter output, HelperOptions options, dynamic context, object[] arguments) =>
Handlebars.RegisterHelper("StringEqualityBlockHelper", (output, options, context, arguments) =>
{
if (arguments.Length != 2) throw new HandlebarsException("{{StringEqualityBlockHelper}} helper must have exactly two argument");

var left = arguments[0] as string;
if (arguments.Length != 2)
{
throw new HandlebarsException("{{#StringEqualityBlockHelper}} helper must have exactly two arguments");
}

var left = arguments.At<string>(0);
var right = arguments[1] as string;
if (left == right) options.Template(output, null);
else options.Inverse(output, null);
if (left == right) options.Template(output, context);
else options.Inverse(output, context);
});

var animals = new Dictionary<string, string>()
Expand All@@ -141,8 +144,8 @@ var animals = new Dictionary<string, string>()
{"Chewy", "hamster" }
};

string template = "{{#each this}}The animal, {{@key}}, {{#StringEqualityBlockHelper @value 'dog'}}is a dog{{else}}is not a dog{{/StringEqualityBlockHelper}}.\r\n{{/each}}";
Func<object, string> compiledTemplate = Handlebars.Compile(template);
var template = "{{#each this}}The animal, {{@key}}, {{#StringEqualityBlockHelper @value 'dog'}}is a dog{{else}}is not a dog{{/StringEqualityBlockHelper}}.\r\n{{/each}}";
var compiledTemplate = Handlebars.Compile(template);
string templateOutput = compiledTemplate(animals);

/* Would render
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44 changes: 44 additions & 0 deletions source/Handlebars.Test/ReadmeTests.cs
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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,44 @@
using System.Collections.Generic;
using Xunit;

namespace HandlebarsDotNet.Test
{
public class ReadmeTests
{
[Fact]
public void RegisterBlockHelper()
{
var handlebars = Handlebars.Create();
handlebars.RegisterHelper("StringEqualityBlockHelper", (output, options, context, arguments) =>
{
if (arguments.Length != 2)
{
throw new HandlebarsException("{{#StringEqualityBlockHelper}} helper must have exactly two arguments");
}

var left = arguments.At<string>(0);
var right = arguments[1] as string;
if (left == right) options.Template(output, context);
else options.Inverse(output, context);
});

var animals = new Dictionary<string, string>
{
{"Fluffy", "cat" },
{"Fido", "dog" },
{"Chewy", "hamster" }
};

var template = "{{#each this}}The animal, {{@key}}, {{#StringEqualityBlockHelper @value 'dog'}}is a dog{{else}}is not a dog{{/StringEqualityBlockHelper}}.\r\n{{/each}}";
var compiledTemplate = handlebars.Compile(template);
string templateOutput = compiledTemplate(animals);

Assert.Equal(
"The animal, Fluffy, is not a dog.\r\n" +
"The animal, Fido, is a dog.\r\n" +
"The animal, Chewy, is not a dog.\r\n",
templateOutput
);
}
}
}