93 lines
2.1 KiB
JavaScript
93 lines
2.1 KiB
JavaScript
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'use strict';
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const isLogicalExpression = require('./is-logical-expression.js');
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const isLogicNot = node => node?.type === 'UnaryExpression' && node.operator === '!';
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const isLogicNotArgument = node => isLogicNot(node.parent) && node.parent.argument === node;
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const isBooleanCallArgument = node => isBooleanCall(node.parent) && node.parent.arguments[0] === node;
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const isBooleanCall = node =>
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node?.type === 'CallExpression'
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&& node.callee.type === 'Identifier'
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&& node.callee.name === 'Boolean'
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&& node.arguments.length === 1;
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const isVueBooleanAttributeValue = node =>
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node?.type === 'VExpressionContainer'
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&& node.parent.type === 'VAttribute'
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&& node.parent.directive
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&& node.parent.value === node
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&& node.parent.key.type === 'VDirectiveKey'
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&& node.parent.key.name.type === 'VIdentifier'
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&& (
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node.parent.key.name.rawName === 'if'
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|| node.parent.key.name.rawName === 'else-if'
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|| node.parent.key.name.rawName === 'show'
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);
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/**
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Check if the value of node is a `boolean`.
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@param {Node} node
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@returns {boolean}
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*/
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function isBooleanNode(node) {
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if (
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isLogicNot(node)
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|| isLogicNotArgument(node)
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|| isBooleanCall(node)
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|| isBooleanCallArgument(node)
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) {
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return true;
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}
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const {parent} = node;
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if (isVueBooleanAttributeValue(parent)) {
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return true;
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}
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if (
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(
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parent.type === 'IfStatement'
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|| parent.type === 'ConditionalExpression'
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|| parent.type === 'WhileStatement'
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|| parent.type === 'DoWhileStatement'
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|| parent.type === 'ForStatement'
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)
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&& parent.test === node
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) {
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return true;
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}
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if (isLogicalExpression(parent)) {
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return isBooleanNode(parent);
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}
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return false;
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}
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/**
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Get the boolean type-casting ancestor.
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@typedef {{ node: Node, isNegative: boolean }} Result
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@param {Node} node
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@returns {Result}
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*/
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function getBooleanAncestor(node) {
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let isNegative = false;
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// eslint-disable-next-line no-constant-condition
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while (true) {
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if (isLogicNotArgument(node)) {
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isNegative = !isNegative;
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node = node.parent;
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} else if (isBooleanCallArgument(node)) {
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node = node.parent;
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} else {
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break;
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}
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}
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return {node, isNegative};
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}
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module.exports = {isBooleanNode, getBooleanAncestor};
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