pro-docs/libs/codemirror/mode/go/go.js

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

        var keywords = {
            break: true,
            case: true,
            chan: true,
            const: true,
            continue: true,
            default: true,
            defer: true,
            else: true,
            fallthrough: true,
            for: true,
            func: true,
            go: true,
            goto: true,
            if: true,
            import: true,
            interface: true,
            map: true,
            package: true,
            range: true,
            return: true,
            select: true,
            struct: true,
            switch: true,
            type: true,
            var: true,
            bool: true,
            byte: true,
            complex64: true,
            complex128: true,
            float32: true,
            float64: true,
            int8: true,
            int16: true,
            int32: true,
            int64: true,
            string: true,
            uint8: true,
            uint16: true,
            uint32: true,
            uint64: true,
            int: true,
            uint: true,
            uintptr: true,
            error: true,
            rune: true,
        }

        var atoms = {
            true: true,
            false: true,
            iota: true,
            nil: true,
            append: true,
            cap: true,
            close: true,
            complex: true,
            copy: true,
            delete: true,
            imag: true,
            len: true,
            make: true,
            new: true,
            panic: true,
            print: true,
            println: true,
            real: true,
            recover: true,
        }

        var isOperatorChar = /[+\-*&^%:=<>!|\/]/

        var curPunc

        function tokenBase(stream, state) {
            var ch = stream.next()
            if (ch == '"' || ch == "'" || ch == '`') {
                state.tokenize = tokenString(ch)
                return state.tokenize(stream, state)
            }
            if (/[\d\.]/.test(ch)) {
                if (ch == '.') {
                    stream.match(/^[0-9]+([eE][\-+]?[0-9]+)?/)
                } else if (ch == '0') {
                    stream.match(/^[xX][0-9a-fA-F]+/) || stream.match(/^0[0-7]+/)
                } else {
                    stream.match(/^[0-9]*\.?[0-9]*([eE][\-+]?[0-9]+)?/)
                }
                return 'number'
            }
            if (/[\[\]{}\(\),;\:\.]/.test(ch)) {
                curPunc = ch
                return null
            }
            if (ch == '/') {
                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 (cur == 'case' || cur == 'default') curPunc = 'case'
                return 'keyword'
            }
            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 && quote != '`' && next == '\\'
                }
                if (end || !(escaped || quote == '`')) state.tokenize = tokenBase
                return 'string'
            }
        }

        function tokenComment(stream, state) {
            var maybeEnd = false,
                ch
            while ((ch = stream.next())) {
                if (ch == '/' && maybeEnd) {
                    state.tokenize = tokenBase
                    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) {
            return (state.context = new Context(state.indented, col, type, null, state.context))
        }
        function popContext(state) {
            if (!state.context.prev) return
            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 (ctx.type == 'case') ctx.type = '}'
                }
                if (stream.eatSpace()) return null
                curPunc = null
                var style = (state.tokenize || tokenBase)(stream, state)
                if (style == 'comment') return style
                if (ctx.align == null) ctx.align = true

                if (curPunc == '{') pushContext(state, stream.column(), '}')
                else if (curPunc == '[') pushContext(state, stream.column(), ']')
                else if (curPunc == '(') pushContext(state, stream.column(), ')')
                else if (curPunc == 'case') ctx.type = 'case'
                else if (curPunc == '}' && ctx.type == '}') popContext(state)
                else if (curPunc == ctx.type) popContext(state)
                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 == 'case' && /^(?:case|default)\b/.test(textAfter)) {
                    state.context.type = '}'
                    return ctx.indented
                }
                var closing = firstChar == ctx.type
                if (ctx.align) return ctx.column + (closing ? 0 : 1)
                else return ctx.indented + (closing ? 0 : indentUnit)
            },

            electricChars: '{}):',
            closeBrackets: '()[]{}\'\'""``',
            fold: 'brace',
            blockCommentStart: '/*',
            blockCommentEnd: '*/',
            lineComment: '//',
        }
    })

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