mustachex 0.1.1

Mustache Extended

MUSTACHE EXtended for Dart

The features of mustache with the addition of:

• recasing variables
• missing variables fulfillment function
• hasVarName check

All with nested transitive variables handling

Usage

A simple usage example:

import 'package:mustachex/mustachex.dart';

main() async {
  var template = "{{#hasFoo}} this won't be rendered {{/hasFoo}}"
  '{{greeting_pascalCase}} {{world_pc}}!'
  '{{#hasBar}} This neither {{/hasBar}}';
  var vars = {'greeting': 'HELLO', 'foo': false};
  String fulfillmentFunction(MissingVariableException variable) {
    if (variable.varName == 'world') {
      return 'WORLD';
    } else {
      return 'UNIVERSE';
    }
  }

  var processor = MustachexProcessor(
      initialVariables: vars, missingVarFulfiller: fulfillmentFunction);
  var rendered = await processor.process(template);
  assert(rendered == 'Hello World!');
}

Features summary

Variables recasing

You can recase your variables by simply adding and _xxxCase termination:

example	alternative	result
{{ var_snakeCase }}	{{ var_sc }}	snake_case
{{ var_dotCase }}		dot.case
{{ var_pathCase }}		path/case
{{ var_paramCase }}		param-case
{{ var_pascalCase }}	{{ var_pc }}	PascalCase
{{ var_headerCase }}		Header-Case
{{ var_titleCase }}		Title Case
{{ var_camelCase }}	{{ var_cc }}	camelCase
{{ var_sentenceCase }}		Sentence case
{{ var_constantCase }}		CONSTANT_CASE

---

Missing variables fullfillment

the fulfillment function should be of this kind:

String foo(MissingVariableException variable) => 'new_var_value_for_${variable.varName}';

and supposing the source of the missing exception was the following:

var src = '{{#parent1}}{{#parent2}}'
          '{{var_paramCase}}'
          '{{/parent2}}{{/parent1}}';

variable will have all this values:

variable.recasing; // 'paramCase'
variable.request; // 'var_paramCase'
variable.varName; // 'var'
variable.parentCollections; // ['parent1', 'parent2']
variable.humanReadableVariable; // "['parent1'],['parent2'],['var']"
variable.parentCollectionsWithVarName; // ['parent1', 'parent2', 'var']
variable.parentCollectionsWithRequest; // ['parent1', 'parent2', 'var_paramCase']

hasFoo guard

The mustache's sections that begins with has will automatically include a variable with the same name that will contain true or false depending on the context in which it was computed.

Supposing a mustache code of:

{{#hasFoo}}hasFoo was true{{/hasFoo}}
{{^hasFoo}}hasFoo was false{{/hasFoo}}

And the following JSON:

var json = {'foo': valueOfFoo}

valueOfFoo	hasFoo value	rendered mustache
null	false	hasFoo was false
[]	false	hasFoo was false
{}	false	hasFoo was false
''	false	hasFoo was false
'a'	true	hasFoo was true
{'a':1}	true	hasFoo was true
['a']	true	hasFoo was true
false	true	hasFoo was false
true	true	hasFoo was true