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node-attributes.js
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node-attributes.js
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// Return attributes and values of a node in a convenient way:
/* example:
<ExampleElement attr1="15" attr2>
{ attr1: {
hasValue: true,
value: 15
},
attr2: {
hasValue: false
}
Inclusion of hasValue is in case an eslint rule cares about boolean values
explicitely assigned to attribute vs the attribute being used as a flag
*/
class NodeAttributes {
constructor(ASTnode) {
this.attributes = {}
ASTnode.attributes.forEach((attribute) => {
if (!attribute.type || attribute.type !== 'JSXAttribute') {
return
}
this.attributes[attribute.name.name] = {
hasValue: !!attribute.value,
}
if (attribute.value) {
if (attribute.value.value) {
this.attributes[attribute.name.name].value = attribute.value.value
} else if (attribute.value.expression) {
this.attributes[attribute.name.name].value =
typeof attribute.value.expression.value !== 'undefined'
? attribute.value.expression.value
: attribute.value.expression.properties
}
}
})
}
hasAny() {
return !!Object.keys(this.attributes).length
}
has(attrName) {
return !!this.attributes[attrName]
}
hasValue(attrName) {
return !!this.attributes[attrName].hasValue
}
value(attrName) {
if (!this.attributes[attrName]) {
return true
}
return this.attributes[attrName].value
}
}
module.exports = NodeAttributes