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brexpressions
Advanced tools
Grammar and parser for Breezy's expressions in brackets.
Breezy uses expressions as placeholders that will be substituted with the value when rendered. Expression are very similar to JavaScript property lookups and function calls with the tenary operator. A full expression looks like:
path[.to.method] [args... ] [? truthy] [: falsy]
path
is either a direct or dot-separated nested property lookup. args
can be any number of (whitespace separated) parameters if the result of the path lookup is a function. Each parameter can either be another path or a sinlge- or doublequoted string. The optional truthy and falsy block can be used to change the return value to another value or string.
Examples:
name
property:
name
site
and get the title
:
site.title
name
and call the toUpperCase
string method:
name.toUpperCase
helpers.equal
method to check the name against a string:
helpers.equal name 'David'
helpers.equal
method and return Yes
if it matches (null
otherwise):
helpers.equal name 'David' ? 'Yes'
helpers.equal
method and return No
if it does not match (null
otherwise):
helpers.equal name 'David' : 'No'
helpers.equal
method and return Yes
if and No
if it does not match:
helpers.equal name 'David' ? 'Yes' : 'No'
helpers.equal
simply looks like:
{
helpers: {
equal: function(first, second) {
return first === second;
}
}
}
Expressions can be used in Attributes or any other text when wrapped with double curly braces {{}}
:
<div show-if="helpers.equal name 'David'">Hi {{name.toUpperCase}} how are you?</div>
<img src="person.png" alt="This person is: {{helpers.equal name 'David' ? 'Dave' : 'I don\'t know'}}">
Note: Dynamically adding attributes like <img {{helpers.equal name 'David' ? 'alt="This is David"'}}>
is currently not supported. This can almost always be done in a more HTML-y way, anyway, for example using a custom attribute.
FAQs
Grammar and parser for breezy expressions in brackets.
We found that brexpressions demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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