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113 lines
2.6 KiB
113 lines
2.6 KiB
/**
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* Type representing a valid where operator.
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*/
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type WhereOperator = '&' | '>' | '>=' | '<' | '<=' | '!=' | '<=>' | '%' | '|' | '!' | '~' | '=' | '^'
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/**
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* Type associating search items with a key.
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*/
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type AssociatedSearchItem = { key: any, item: any }
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/**
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* Type representing the result of a where.
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*/
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type WhereResult = any[]
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/**
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* Returns true if the given item satisfies the given where clause.
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* @param {AssociatedSearchItem} item
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* @param {WhereOperator} operator
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* @param [operand]
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* @return boolean
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*/
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const whereMatch = (item: AssociatedSearchItem, operator: WhereOperator, operand?: unknown): boolean => {
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switch ( operator ) {
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case '&':
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if ( item.key & Number(operand) ) {
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return true
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}
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break
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case '>':
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if ( item.key > (operand as any) ) {
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return true
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}
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break
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case '>=':
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if ( item.key >= (operand as any) ) {
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return true
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}
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break
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case '<':
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if ( item.key < (operand as any) ) {
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return true
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}
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break
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case '<=':
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if ( item.key <= (operand as any) ) {
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return true
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}
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break
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case '!=':
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if ( item.key !== (operand as any) ) {
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return true
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}
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break
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case '<=>':
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if ( item.key === operand && typeof item.key !== 'undefined' && item.key !== null ) {
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return true
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}
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break
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case '%':
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if ( item.key % Number(operand) ) {
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return true
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}
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break
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case '|':
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if ( item.key | Number(operand) ) {
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return true
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}
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break
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case '!':
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if ( !item.key ) {
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return true
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}
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break
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case '~':
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if ( ~item.key ) {
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return true
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}
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break
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case '=':
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if ( item.key === operand ) {
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return true
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}
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break
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case '^':
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if ( item.key ^ Number(operand) ) {
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return true
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}
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break
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}
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return false
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}
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/**
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* Apply the given where clause to the items and return those that match.
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* @param {Array<AssociatedSearchItem>} items
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* @param {WhereOperator} operator
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* @param [operand]
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*/
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const applyWhere = (items: AssociatedSearchItem[], operator: WhereOperator, operand?: unknown): WhereResult => {
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const matches: WhereResult = []
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for ( const item of items ) {
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if ( whereMatch(item, operator, operand) ) {
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matches.push(item.item)
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}
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}
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return matches
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}
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export { WhereOperator, WhereResult, AssociatedSearchItem, applyWhere, whereMatch }
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