var AND_REGEXP = /^\s+and\s+(.*)/i
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var OR_REGEXP = /^(?:,\s*|\s+or\s+)(.*)/i
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function flatten(array) {
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if (!Array.isArray(array)) return [array]
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return array.reduce(function (a, b) {
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return a.concat(flatten(b))
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}, [])
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}
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function find(string, predicate) {
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for (var n = 1, max = string.length; n <= max; n++) {
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var parsed = string.substr(-n, n)
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if (predicate(parsed, n, max)) {
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return string.slice(0, -n)
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}
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}
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return ''
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}
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function matchQuery(all, query) {
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var node = { query: query }
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if (query.indexOf('not ') === 0) {
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node.not = true
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query = query.slice(4)
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}
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for (var name in all) {
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var type = all[name]
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var match = query.match(type.regexp)
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if (match) {
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node.type = name
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for (var i = 0; i < type.matches.length; i++) {
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node[type.matches[i]] = match[i + 1]
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}
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return node
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}
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}
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node.type = 'unknown'
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return node
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}
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function matchBlock(all, string, qs) {
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var node
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return find(string, function (parsed, n, max) {
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if (AND_REGEXP.test(parsed)) {
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node = matchQuery(all, parsed.match(AND_REGEXP)[1])
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node.compose = 'and'
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qs.unshift(node)
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return true
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} else if (OR_REGEXP.test(parsed)) {
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node = matchQuery(all, parsed.match(OR_REGEXP)[1])
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node.compose = 'or'
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qs.unshift(node)
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return true
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} else if (n === max) {
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node = matchQuery(all, parsed.trim())
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node.compose = 'or'
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qs.unshift(node)
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return true
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}
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return false
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})
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}
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module.exports = function parse(all, queries) {
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if (!Array.isArray(queries)) queries = [queries]
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return flatten(
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queries.map(function (block) {
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var qs = []
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do {
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block = matchBlock(all, block, qs)
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} while (block)
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return qs
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})
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)
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}
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