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/**
* @fileoverview Rule that warns when identifier names are shorter or longer
* than the values provided in configuration.
* @author Burak Yigit Kaya aka BYK
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "enforce minimum and maximum identifier lengths",
category: "Stylistic Issues",
recommended: false
},
schema: [
{
type: "object",
properties: {
min: {
type: "number"
},
max: {
type: "number"
},
exceptions: {
type: "array",
uniqueItems: true,
items: {
type: "string"
}
},
properties: {
enum: ["always", "never"]
}
},
additionalProperties: false
}
]
},
create(context) {
const options = context.options[0] || {};
const minLength = typeof options.min !== "undefined" ? options.min : 2;
const maxLength = typeof options.max !== "undefined" ? options.max : Infinity;
const properties = options.properties !== "never";
const exceptions = (options.exceptions ? options.exceptions : [])
.reduce((obj, item) => {
obj[item] = true;
return obj;
}, {});
const SUPPORTED_EXPRESSIONS = {
MemberExpression: properties && function(parent) {
return !parent.computed && (
// regular property assignment
(parent.parent.left === parent && parent.parent.type === "AssignmentExpression" ||
// or the last identifier in an ObjectPattern destructuring
parent.parent.type === "Property" && parent.parent.value === parent &&
parent.parent.parent.type === "ObjectPattern" && parent.parent.parent.parent.left === parent.parent.parent)
);
},
AssignmentPattern(parent, node) {
return parent.left === node;
},
VariableDeclarator(parent, node) {
return parent.id === node;
},
Property: properties && function(parent, node) {
return parent.key === node;
},
ImportDefaultSpecifier: true,
RestElement: true,
FunctionExpression: true,
ArrowFunctionExpression: true,
ClassDeclaration: true,
FunctionDeclaration: true,
MethodDefinition: true,
CatchClause: true
};
return {
Identifier(node) {
const name = node.name;
const parent = node.parent;
const isShort = name.length < minLength;
const isLong = name.length > maxLength;
if (!(isShort || isLong) || exceptions[name]) {
return; // Nothing to report
}
const isValidExpression = SUPPORTED_EXPRESSIONS[parent.type];
if (isValidExpression && (isValidExpression === true || isValidExpression(parent, node))) {
context.report({
node,
message: isShort
? "Identifier name '{{name}}' is too short (< {{min}})."
: "Identifier name '{{name}}' is too long (> {{max}}).",
data: { name, min: minLength, max: maxLength }
});
}
}
};
}
};
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