Goatee

Mustache templates for JSON structures. *

Goatee takes the form of the mustache templating language, but applies it to nested JSON data structures. The goatee parser uses a template JSON structure, applying the mustache template parser to every string field.

Goatee can also expand nested elements into arrays based on the template structure. If the goatee parser finds a lone #each command as a dictionary key, it will take the field value and replace dictionary with an expanded version of the data. When expanding a structure, such as an array of strings, the varible name becomes this. For example the structure { "{{#each names}}" : { "name" : "{{this}}" } } with the data {"names" : ["Alice", "Bob", "Chuck"]} would produce the output [{"name":"Alice"}, {"name":"Bob"}, {"name":"Chuck"}].

Example 1

Example 1 Input

{
    "names" : ["test1", "test2", "test3"]
}

Example 1 Template

{
    "name": "job1",
    "inputs" : {
        "{{#each names}}" : "/home/{{this}}.txt"
    }
}

Example 2 Output

{
    "name": "job1",
    "inputs" : [
        "/home/test1.txt",
        "/home/test2.txt",
        "/home/test3.txt"
    ]
}

Example 2

Because the pattern for unrolling input arrays returns a dictionary, there needs to be a way to merge multiple sub-structure outputs into a single dictionary.

For the input

{
    "inputs" : [
        {"name" : "job1", "state": "queued"},
        {"name" : "job2", "state": "waiting"},
        {"name" : "job3", "state": "running"},
        {"name" : "job4", "state": "done"}
    ]
}

and the template

{
    "{{#each inputs}}" : {
		"task_{{name}}" : {
			"state" : "{{state}}"
		}
	}
}

we get the results

[
    {"task_job1" : {"state": "queued"} },
    {"task_job2" : {"state": "waiting"} },
    {"task_job3" : {"state": "running"} },
    {"task_job4" : {"state": "done"} }
]

If theese elements belong to a {{#merge}} they will be merged into a single dictionary.

So the template

{   
    "{{#merge}}" : {
        "{{#each inputs}}" : {
            "task_{{name}}" : {
                "state" : "{{state}}"
            }
        }
    }
}

Results in: