// 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('d', function (config, parserConfig) {
        var indentUnit = config.indentUnit,
            statementIndentUnit = parserConfig.statementIndentUnit || indentUnit,
            keywords = parserConfig.keywords || {},
            builtin = parserConfig.builtin || {},
            blockKeywords = parserConfig.blockKeywords || {},
            atoms = parserConfig.atoms || {},
            hooks = parserConfig.hooks || {},
            multiLineStrings = parserConfig.multiLineStrings
        var isOperatorChar = /[+\-*&%=<>!?|\/]/

        var curPunc

        function tokenBase(stream, state) {
            var ch = stream.next()
            if (hooks[ch]) {
                var result = hooks[ch](stream, state)
                if (result !== false) return result
            }
            if (ch == '"' || ch == "'" || ch == '`') {
                state.tokenize = tokenString(ch)
                return state.tokenize(stream, state)
            }
            if (/[\[\]{}\(\),;\:\.]/.test(ch)) {
                curPunc = ch
                return null
            }
            if (/\d/.test(ch)) {
                stream.eatWhile(/[\w\.]/)
                return 'number'
            }
            if (ch == '/') {
                if (stream.eat('+')) {
                    state.tokenize = tokenNestedComment
                    return tokenNestedComment(stream, state)
                }
                if (stream.eat('*')) {
                    state.tokenize = tokenComment
                    return tokenComment(stream, state)
                }
                if (stream.eat('/')) {
                    stream.skipToEnd()
                    return 'comment'
                }
            }
            if (isOperatorChar.test(ch)) {
                stream.eatWhile(isOperatorChar)
                return 'operator'
            }
            stream.eatWhile(/[\w\$_\xa1-\uffff]/)
            var cur = stream.current()
            if (keywords.propertyIsEnumerable(cur)) {
                if (blockKeywords.propertyIsEnumerable(cur)) curPunc = 'newstatement'
                return 'keyword'
            }
            if (builtin.propertyIsEnumerable(cur)) {
                if (blockKeywords.propertyIsEnumerable(cur)) curPunc = 'newstatement'
                return 'builtin'
            }
            if (atoms.propertyIsEnumerable(cur)) return 'atom'
            return 'variable'
        }

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

        function tokenComment(stream, state) {
            var maybeEnd = false,
                ch
            while ((ch = stream.next())) {
                if (ch == '/' && maybeEnd) {
                    state.tokenize = null
                    break
                }
                maybeEnd = ch == '*'
            }
            return 'comment'
        }

        function tokenNestedComment(stream, state) {
            var maybeEnd = false,
                ch
            while ((ch = stream.next())) {
                if (ch == '/' && maybeEnd) {
                    state.tokenize = null
                    break
                }
                maybeEnd = ch == '+'
            }
            return 'comment'
        }

        function Context(indented, column, type, align, prev) {
            this.indented = indented
            this.column = column
            this.type = type
            this.align = align
            this.prev = prev
        }
        function pushContext(state, col, type) {
            var indent = state.indented
            if (state.context && state.context.type == 'statement') indent = state.context.indented
            return (state.context = new Context(indent, col, type, null, state.context))
        }
        function popContext(state) {
            var t = state.context.type
            if (t == ')' || t == ']' || t == '}') state.indented = state.context.indented
            return (state.context = state.context.prev)
        }

        // Interface

        return {
            startState: function (basecolumn) {
                return {
                    tokenize: null,
                    context: new Context((basecolumn || 0) - indentUnit, 0, 'top', false),
                    indented: 0,
                    startOfLine: true,
                }
            },

            token: function (stream, state) {
                var ctx = state.context
                if (stream.sol()) {
                    if (ctx.align == null) ctx.align = false
                    state.indented = stream.indentation()
                    state.startOfLine = true
                }
                if (stream.eatSpace()) return null
                curPunc = null
                var style = (state.tokenize || tokenBase)(stream, state)
                if (style == 'comment' || style == 'meta') return style
                if (ctx.align == null) ctx.align = true

                if ((curPunc == ';' || curPunc == ':' || curPunc == ',') && ctx.type == 'statement') popContext(state)
                else if (curPunc == '{') pushContext(state, stream.column(), '}')
                else if (curPunc == '[') pushContext(state, stream.column(), ']')
                else if (curPunc == '(') pushContext(state, stream.column(), ')')
                else if (curPunc == '}') {
                    while (ctx.type == 'statement') ctx = popContext(state)
                    if (ctx.type == '}') ctx = popContext(state)
                    while (ctx.type == 'statement') ctx = popContext(state)
                } else if (curPunc == ctx.type) popContext(state)
                else if (((ctx.type == '}' || ctx.type == 'top') && curPunc != ';') || (ctx.type == 'statement' && curPunc == 'newstatement')) pushContext(state, stream.column(), 'statement')
                state.startOfLine = false
                return style
            },

            indent: function (state, textAfter) {
                if (state.tokenize != tokenBase && state.tokenize != null) return CodeMirror.Pass
                var ctx = state.context,
                    firstChar = textAfter && textAfter.charAt(0)
                if (ctx.type == 'statement' && firstChar == '}') ctx = ctx.prev
                var closing = firstChar == ctx.type
                if (ctx.type == 'statement') return ctx.indented + (firstChar == '{' ? 0 : statementIndentUnit)
                else if (ctx.align) return ctx.column + (closing ? 0 : 1)
                else return ctx.indented + (closing ? 0 : indentUnit)
            },

            electricChars: '{}',
            blockCommentStart: '/*',
            blockCommentEnd: '*/',
            blockCommentContinue: ' * ',
            lineComment: '//',
            fold: 'brace',
        }
    })

    function words(str) {
        var obj = {},
            words = str.split(' ')
        for (var i = 0; i < words.length; ++i) obj[words[i]] = true
        return obj
    }

    var blockKeywords = 'body catch class do else enum for foreach foreach_reverse if in interface mixin ' + 'out scope struct switch try union unittest version while with'

    CodeMirror.defineMIME('text/x-d', {
        name: 'd',
        keywords: words(
            'abstract alias align asm assert auto break case cast cdouble cent cfloat const continue ' +
                'debug default delegate delete deprecated export extern final finally function goto immutable ' +
                'import inout invariant is lazy macro module new nothrow override package pragma private ' +
                'protected public pure ref return shared short static super synchronized template this ' +
                'throw typedef typeid typeof volatile __FILE__ __LINE__ __gshared __traits __vector __parameters ' +
                blockKeywords
        ),
        blockKeywords: words(blockKeywords),
        builtin: words('bool byte char creal dchar double float idouble ifloat int ireal long real short ubyte ' + 'ucent uint ulong ushort wchar wstring void size_t sizediff_t'),
        atoms: words('exit failure success true false null'),
        hooks: {
            '@': function (stream, _state) {
                stream.eatWhile(/[\w\$_]/)
                return 'meta'
            },
        },
    })
})