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

/**********************************************************
 * This script provides syntax highlighting support for
 * the N-Triples format.
 * N-Triples format specification:
 *     https://www.w3.org/TR/n-triples/
 ***********************************************************/

/*
    The following expression defines the defined ASF grammar transitions.

    pre_subject ->
        {
        ( writing_subject_uri | writing_bnode_uri )
            -> pre_predicate
                -> writing_predicate_uri
                    -> pre_object
                        -> writing_object_uri | writing_object_bnode |
                          (
                            writing_object_literal
                                -> writing_literal_lang | writing_literal_type
                          )
                            -> post_object
                                -> BEGIN
         } otherwise {
             -> ERROR
         }
*/

;(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('ntriples', function () {
        var Location = {
            PRE_SUBJECT: 0,
            WRITING_SUB_URI: 1,
            WRITING_BNODE_URI: 2,
            PRE_PRED: 3,
            WRITING_PRED_URI: 4,
            PRE_OBJ: 5,
            WRITING_OBJ_URI: 6,
            WRITING_OBJ_BNODE: 7,
            WRITING_OBJ_LITERAL: 8,
            WRITING_LIT_LANG: 9,
            WRITING_LIT_TYPE: 10,
            POST_OBJ: 11,
            ERROR: 12,
        }
        function transitState(currState, c) {
            var currLocation = currState.location
            var ret

            // Opening.
            if (currLocation == Location.PRE_SUBJECT && c == '<') ret = Location.WRITING_SUB_URI
            else if (currLocation == Location.PRE_SUBJECT && c == '_') ret = Location.WRITING_BNODE_URI
            else if (currLocation == Location.PRE_PRED && c == '<') ret = Location.WRITING_PRED_URI
            else if (currLocation == Location.PRE_OBJ && c == '<') ret = Location.WRITING_OBJ_URI
            else if (currLocation == Location.PRE_OBJ && c == '_') ret = Location.WRITING_OBJ_BNODE
            else if (currLocation == Location.PRE_OBJ && c == '"') ret = Location.WRITING_OBJ_LITERAL
            // Closing.
            else if (currLocation == Location.WRITING_SUB_URI && c == '>') ret = Location.PRE_PRED
            else if (currLocation == Location.WRITING_BNODE_URI && c == ' ') ret = Location.PRE_PRED
            else if (currLocation == Location.WRITING_PRED_URI && c == '>') ret = Location.PRE_OBJ
            else if (currLocation == Location.WRITING_OBJ_URI && c == '>') ret = Location.POST_OBJ
            else if (currLocation == Location.WRITING_OBJ_BNODE && c == ' ') ret = Location.POST_OBJ
            else if (currLocation == Location.WRITING_OBJ_LITERAL && c == '"') ret = Location.POST_OBJ
            else if (currLocation == Location.WRITING_LIT_LANG && c == ' ') ret = Location.POST_OBJ
            else if (currLocation == Location.WRITING_LIT_TYPE && c == '>') ret = Location.POST_OBJ
            // Closing typed and language literal.
            else if (currLocation == Location.WRITING_OBJ_LITERAL && c == '@') ret = Location.WRITING_LIT_LANG
            else if (currLocation == Location.WRITING_OBJ_LITERAL && c == '^') ret = Location.WRITING_LIT_TYPE
            // Spaces.
            else if (c == ' ' && (currLocation == Location.PRE_SUBJECT || currLocation == Location.PRE_PRED || currLocation == Location.PRE_OBJ || currLocation == Location.POST_OBJ))
                ret = currLocation
            // Reset.
            else if (currLocation == Location.POST_OBJ && c == '.') ret = Location.PRE_SUBJECT
            // Error
            else ret = Location.ERROR

            currState.location = ret
        }

        return {
            startState: function () {
                return {
                    location: Location.PRE_SUBJECT,
                    uris: [],
                    anchors: [],
                    bnodes: [],
                    langs: [],
                    types: [],
                }
            },
            token: function (stream, state) {
                var ch = stream.next()
                if (ch == '<') {
                    transitState(state, ch)
                    var parsedURI = ''
                    stream.eatWhile(function (c) {
                        if (c != '#' && c != '>') {
                            parsedURI += c
                            return true
                        }
                        return false
                    })
                    state.uris.push(parsedURI)
                    if (stream.match('#', false)) return 'variable'
                    stream.next()
                    transitState(state, '>')
                    return 'variable'
                }
                if (ch == '#') {
                    var parsedAnchor = ''
                    stream.eatWhile(function (c) {
                        if (c != '>' && c != ' ') {
                            parsedAnchor += c
                            return true
                        }
                        return false
                    })
                    state.anchors.push(parsedAnchor)
                    return 'variable-2'
                }
                if (ch == '>') {
                    transitState(state, '>')
                    return 'variable'
                }
                if (ch == '_') {
                    transitState(state, ch)
                    var parsedBNode = ''
                    stream.eatWhile(function (c) {
                        if (c != ' ') {
                            parsedBNode += c
                            return true
                        }
                        return false
                    })
                    state.bnodes.push(parsedBNode)
                    stream.next()
                    transitState(state, ' ')
                    return 'builtin'
                }
                if (ch == '"') {
                    transitState(state, ch)
                    stream.eatWhile(function (c) {
                        return c != '"'
                    })
                    stream.next()
                    if (stream.peek() != '@' && stream.peek() != '^') {
                        transitState(state, '"')
                    }
                    return 'string'
                }
                if (ch == '@') {
                    transitState(state, '@')
                    var parsedLang = ''
                    stream.eatWhile(function (c) {
                        if (c != ' ') {
                            parsedLang += c
                            return true
                        }
                        return false
                    })
                    state.langs.push(parsedLang)
                    stream.next()
                    transitState(state, ' ')
                    return 'string-2'
                }
                if (ch == '^') {
                    stream.next()
                    transitState(state, '^')
                    var parsedType = ''
                    stream.eatWhile(function (c) {
                        if (c != '>') {
                            parsedType += c
                            return true
                        }
                        return false
                    })
                    state.types.push(parsedType)
                    stream.next()
                    transitState(state, '>')
                    return 'variable'
                }
                if (ch == ' ') {
                    transitState(state, ch)
                }
                if (ch == '.') {
                    transitState(state, ch)
                }
            },
        }
    })

    // define the registered Media Type for n-triples:
    // https://www.w3.org/TR/n-triples/#n-triples-mediatype
    CodeMirror.defineMIME('application/n-triples', 'ntriples')

    // N-Quads is based on the N-Triples format (so same highlighting works)
    // https://www.w3.org/TR/n-quads/
    CodeMirror.defineMIME('application/n-quads', 'ntriples')

    // previously used, though technically incorrect media type for n-triples
    CodeMirror.defineMIME('text/n-triples', 'ntriples')
})