// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

;(function (mod) {
    if (typeof exports == 'object' && typeof module == 'object')
        // CommonJS
        mod(require('../../lib/codemirror'))
    else if (typeof define == 'function' && define.amd)
        // AMD
        define(['../../lib/codemirror'], mod)
    // Plain browser env
    else mod(CodeMirror)
})(function (CodeMirror) {
    'use strict'

    CodeMirror.defineMode('solr', function () {
        'use strict'

        var isStringChar = /[^\s\|\!\+\-\*\?\~\^\&\:\(\)\[\]\{\}\"\\]/
        var isOperatorChar = /[\|\!\+\-\*\?\~\^\&]/
        var isOperatorString = /^(OR|AND|NOT|TO)$/i

        function isNumber(word) {
            return parseFloat(word).toString() === word
        }

        function tokenString(quote) {
            return function (stream, state) {
                var escaped = false,
                    next
                while ((next = stream.next()) != null) {
                    if (next == quote && !escaped) break
                    escaped = !escaped && next == '\\'
                }

                if (!escaped) state.tokenize = tokenBase
                return 'string'
            }
        }

        function tokenOperator(operator) {
            return function (stream, state) {
                var style = 'operator'
                if (operator == '+') style += ' positive'
                else if (operator == '-') style += ' negative'
                else if (operator == '|') stream.eat(/\|/)
                else if (operator == '&') stream.eat(/\&/)
                else if (operator == '^') style += ' boost'

                state.tokenize = tokenBase
                return style
            }
        }

        function tokenWord(ch) {
            return function (stream, state) {
                var word = ch
                while ((ch = stream.peek()) && ch.match(isStringChar) != null) {
                    word += stream.next()
                }

                state.tokenize = tokenBase
                if (isOperatorString.test(word)) return 'operator'
                else if (isNumber(word)) return 'number'
                else if (stream.peek() == ':') return 'field'
                else return 'string'
            }
        }

        function tokenBase(stream, state) {
            var ch = stream.next()
            if (ch == '"') state.tokenize = tokenString(ch)
            else if (isOperatorChar.test(ch)) state.tokenize = tokenOperator(ch)
            else if (isStringChar.test(ch)) state.tokenize = tokenWord(ch)

            return state.tokenize != tokenBase ? state.tokenize(stream, state) : null
        }

        return {
            startState: function () {
                return {
                    tokenize: tokenBase,
                }
            },

            token: function (stream, state) {
                if (stream.eatSpace()) return null
                return state.tokenize(stream, state)
            },
        }
    })

    CodeMirror.defineMIME('text/x-solr', 'solr')
})