// 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('sparql', function (config) {
        var indentUnit = config.indentUnit
        var curPunc

        function wordRegexp(words) {
            return new RegExp('^(?:' + words.join('|') + ')$', 'i')
        }
        var ops = wordRegexp([
            'str',
            'lang',
            'langmatches',
            'datatype',
            'bound',
            'sameterm',
            'isiri',
            'isuri',
            'iri',
            'uri',
            'bnode',
            'count',
            'sum',
            'min',
            'max',
            'avg',
            'sample',
            'group_concat',
            'rand',
            'abs',
            'ceil',
            'floor',
            'round',
            'concat',
            'substr',
            'strlen',
            'replace',
            'ucase',
            'lcase',
            'encode_for_uri',
            'contains',
            'strstarts',
            'strends',
            'strbefore',
            'strafter',
            'year',
            'month',
            'day',
            'hours',
            'minutes',
            'seconds',
            'timezone',
            'tz',
            'now',
            'uuid',
            'struuid',
            'md5',
            'sha1',
            'sha256',
            'sha384',
            'sha512',
            'coalesce',
            'if',
            'strlang',
            'strdt',
            'isnumeric',
            'regex',
            'exists',
            'isblank',
            'isliteral',
            'a',
            'bind',
        ])
        var keywords = wordRegexp([
            'base',
            'prefix',
            'select',
            'distinct',
            'reduced',
            'construct',
            'describe',
            'ask',
            'from',
            'named',
            'where',
            'order',
            'limit',
            'offset',
            'filter',
            'optional',
            'graph',
            'by',
            'asc',
            'desc',
            'as',
            'having',
            'undef',
            'values',
            'group',
            'minus',
            'in',
            'not',
            'service',
            'silent',
            'using',
            'insert',
            'delete',
            'union',
            'true',
            'false',
            'with',
            'data',
            'copy',
            'to',
            'move',
            'add',
            'create',
            'drop',
            'clear',
            'load',
        ])
        var operatorChars = /[*+\-<>=&|\^\/!\?]/

        function tokenBase(stream, state) {
            var ch = stream.next()
            curPunc = null
            if (ch == '$' || ch == '?') {
                if (ch == '?' && stream.match(/\s/, false)) {
                    return 'operator'
                }
                stream.match(
                    /^[A-Za-z0-9_\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C-\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD][A-Za-z0-9_\u00B7\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u037D\u037F-\u1FFF\u200C-\u200D\u203F-\u2040\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD]*/
                )
                return 'variable-2'
            } else if (ch == '<' && !stream.match(/^[\s\u00a0=]/, false)) {
                stream.match(/^[^\s\u00a0>]*>?/)
                return 'atom'
            } else if (ch == '"' || ch == "'") {
                state.tokenize = tokenLiteral(ch)
                return state.tokenize(stream, state)
            } else if (/[{}\(\),\.;\[\]]/.test(ch)) {
                curPunc = ch
                return 'bracket'
            } else if (ch == '#') {
                stream.skipToEnd()
                return 'comment'
            } else if (ch === '^') {
                ch = stream.peek()
                if (ch === '^') stream.eat('^')
                else stream.eatWhile(operatorChars)
                return 'operator'
            } else if (operatorChars.test(ch)) {
                stream.eatWhile(operatorChars)
                return 'operator'
            } else if (ch == ':') {
                eatPnLocal(stream)
                return 'atom'
            } else if (ch == '@') {
                stream.eatWhile(/[a-z\d\-]/i)
                return 'meta'
            } else {
                stream.eatWhile(/[_\w\d]/)
                if (stream.eat(':')) {
                    eatPnLocal(stream)
                    return 'atom'
                }
                var word = stream.current()
                if (ops.test(word)) return 'builtin'
                else if (keywords.test(word)) return 'keyword'
                else return 'variable'
            }
        }

        function eatPnLocal(stream) {
            stream.match(/(\.(?=[\w_\-\\%])|[:\w_-]|\\[-\\_~.!$&'()*+,;=/?#@%]|%[a-f\d][a-f\d])+/i)
        }

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

        function pushContext(state, type, col) {
            state.context = { prev: state.context, indent: state.indent, col: col, type: type }
        }
        function popContext(state) {
            state.indent = state.context.indent
            state.context = state.context.prev
        }

        return {
            startState: function () {
                return { tokenize: tokenBase, context: null, indent: 0, col: 0 }
            },

            token: function (stream, state) {
                if (stream.sol()) {
                    if (state.context && state.context.align == null) state.context.align = false
                    state.indent = stream.indentation()
                }
                if (stream.eatSpace()) return null
                var style = state.tokenize(stream, state)

                if (style != 'comment' && state.context && state.context.align == null && state.context.type != 'pattern') {
                    state.context.align = true
                }

                if (curPunc == '(') pushContext(state, ')', stream.column())
                else if (curPunc == '[') pushContext(state, ']', stream.column())
                else if (curPunc == '{') pushContext(state, '}', stream.column())
                else if (/[\]\}\)]/.test(curPunc)) {
                    while (state.context && state.context.type == 'pattern') popContext(state)
                    if (state.context && curPunc == state.context.type) {
                        popContext(state)
                        if (curPunc == '}' && state.context && state.context.type == 'pattern') popContext(state)
                    }
                } else if (curPunc == '.' && state.context && state.context.type == 'pattern') popContext(state)
                else if (/atom|string|variable/.test(style) && state.context) {
                    if (/[\}\]]/.test(state.context.type)) pushContext(state, 'pattern', stream.column())
                    else if (state.context.type == 'pattern' && !state.context.align) {
                        state.context.align = true
                        state.context.col = stream.column()
                    }
                }

                return style
            },

            indent: function (state, textAfter) {
                var firstChar = textAfter && textAfter.charAt(0)
                var context = state.context
                if (/[\]\}]/.test(firstChar)) while (context && context.type == 'pattern') context = context.prev

                var closing = context && firstChar == context.type
                if (!context) return 0
                else if (context.type == 'pattern') return context.col
                else if (context.align) return context.col + (closing ? 0 : 1)
                else return context.indent + (closing ? 0 : indentUnit)
            },

            lineComment: '#',
        }
    })

    CodeMirror.defineMIME('application/sparql-query', 'sparql')
})