// 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('commonlisp', function (config) {
        var specialForm =
            /^(block|let*|return-from|catch|load-time-value|setq|eval-when|locally|symbol-macrolet|flet|macrolet|tagbody|function|multiple-value-call|the|go|multiple-value-prog1|throw|if|progn|unwind-protect|labels|progv|let|quote)$/
        var assumeBody = /^with|^def|^do|^prog|case$|^cond$|bind$|when$|unless$/
        var numLiteral = /^(?:[+\-]?(?:\d+|\d*\.\d+)(?:[efd][+\-]?\d+)?|[+\-]?\d+(?:\/[+\-]?\d+)?|#b[+\-]?[01]+|#o[+\-]?[0-7]+|#x[+\-]?[\da-f]+)/
        var symbol = /[^\s'`,@()\[\]";]/
        var type

        function readSym(stream) {
            var ch
            while ((ch = stream.next())) {
                if (ch == '\\') stream.next()
                else if (!symbol.test(ch)) {
                    stream.backUp(1)
                    break
                }
            }
            return stream.current()
        }

        function base(stream, state) {
            if (stream.eatSpace()) {
                type = 'ws'
                return null
            }
            if (stream.match(numLiteral)) return 'number'
            var ch = stream.next()
            if (ch == '\\') ch = stream.next()

            if (ch == '"') return (state.tokenize = inString)(stream, state)
            else if (ch == '(') {
                type = 'open'
                return 'bracket'
            } else if (ch == ')' || ch == ']') {
                type = 'close'
                return 'bracket'
            } else if (ch == ';') {
                stream.skipToEnd()
                type = 'ws'
                return 'comment'
            } else if (/['`,@]/.test(ch)) return null
            else if (ch == '|') {
                if (stream.skipTo('|')) {
                    stream.next()
                    return 'symbol'
                } else {
                    stream.skipToEnd()
                    return 'error'
                }
            } else if (ch == '#') {
                var ch = stream.next()
                if (ch == '(') {
                    type = 'open'
                    return 'bracket'
                } else if (/[+\-=\.']/.test(ch)) return null
                else if (/\d/.test(ch) && stream.match(/^\d*#/)) return null
                else if (ch == '|') return (state.tokenize = inComment)(stream, state)
                else if (ch == ':') {
                    readSym(stream)
                    return 'meta'
                } else if (ch == '\\') {
                    stream.next()
                    readSym(stream)
                    return 'string-2'
                } else return 'error'
            } else {
                var name = readSym(stream)
                if (name == '.') return null
                type = 'symbol'
                if (name == 'nil' || name == 't' || name.charAt(0) == ':') return 'atom'
                if (state.lastType == 'open' && (specialForm.test(name) || assumeBody.test(name))) return 'keyword'
                if (name.charAt(0) == '&') return 'variable-2'
                return 'variable'
            }
        }

        function inString(stream, state) {
            var escaped = false,
                next
            while ((next = stream.next())) {
                if (next == '"' && !escaped) {
                    state.tokenize = base
                    break
                }
                escaped = !escaped && next == '\\'
            }
            return 'string'
        }

        function inComment(stream, state) {
            var next, last
            while ((next = stream.next())) {
                if (next == '#' && last == '|') {
                    state.tokenize = base
                    break
                }
                last = next
            }
            type = 'ws'
            return 'comment'
        }

        return {
            startState: function () {
                return { ctx: { prev: null, start: 0, indentTo: 0 }, lastType: null, tokenize: base }
            },

            token: function (stream, state) {
                if (stream.sol() && typeof state.ctx.indentTo != 'number') state.ctx.indentTo = state.ctx.start + 1

                type = null
                var style = state.tokenize(stream, state)
                if (type != 'ws') {
                    if (state.ctx.indentTo == null) {
                        if (type == 'symbol' && assumeBody.test(stream.current())) state.ctx.indentTo = state.ctx.start + config.indentUnit
                        else state.ctx.indentTo = 'next'
                    } else if (state.ctx.indentTo == 'next') {
                        state.ctx.indentTo = stream.column()
                    }
                    state.lastType = type
                }
                if (type == 'open') state.ctx = { prev: state.ctx, start: stream.column(), indentTo: null }
                else if (type == 'close') state.ctx = state.ctx.prev || state.ctx
                return style
            },

            indent: function (state, _textAfter) {
                var i = state.ctx.indentTo
                return typeof i == 'number' ? i : state.ctx.start + 1
            },

            closeBrackets: { pairs: '()[]{}""' },
            lineComment: ';;',
            fold: 'brace-paren',
            blockCommentStart: '#|',
            blockCommentEnd: '|#',
        }
    })

    CodeMirror.defineMIME('text/x-common-lisp', 'commonlisp')
})