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 *       notice, this list of conditions and the following disclaimer.
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 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
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define(function (require, exports, module) {
    "use strict";

    var oop = require("../lib/oop");
    var JavaScriptHighlightRules = require("./javascript_highlight_rules").JavaScriptHighlightRules;
    var TextHighlightRules = require("./text_highlight_rules").TextHighlightRules;

    var SJSHighlightRules = function () {
        var parent = new JavaScriptHighlightRules({noES6: true});
        var escapedRe = "\\\\(?:x[0-9a-fA-F]{2}|" + // hex
            "u[0-9a-fA-F]{4}|" + // unicode
            "[0-2][0-7]{0,2}|" + // oct
            "3[0-6][0-7]?|" + // oct
            "37[0-7]?|" + // oct
            "[4-7][0-7]?|" + //oct
            ".)";

        var contextAware = function (f) {
            f.isContextAware = true;
            return f;
        };

        var ctxBegin = function (opts) {
            return {
                token: opts.token,
                regex: opts.regex,
                next: contextAware(function (currentState, stack) {
                    if (stack.length === 0)
                        stack.unshift(currentState);
                    stack.unshift(opts.next);
                    return opts.next;
                })
            };
        };

        var ctxEnd = function (opts) {
            return {
                token: opts.token,
                regex: opts.regex,
                next: contextAware(function (currentState, stack) {
                    stack.shift();
                    return stack[0] || "start";
                })
            };
        };

        this.$rules = parent.$rules;
        this.$rules.no_regex = [
            {
                token: "keyword",
                regex: "(waitfor|or|and|collapse|spawn|retract)\\b"
            },
            {
                token: "keyword.operator",
                regex: "(->|=>|\\.\\.)"
            },
            {
                token: "variable.language",
                regex: "(hold|default)\\b"
            },
            ctxBegin({
                token: "string",
                regex: "`",
                next: "bstring"
            }),
            ctxBegin({
                token: "string",
                regex: '"',
                next: "qqstring"
            }),
            ctxBegin({
                token: "string",
                regex: '"',
                next: "qqstring"
            }),
            {
                token: ["paren.lparen", "text", "paren.rparen"],
                regex: "(\\{)(\\s*)(\\|)",
                next: "block_arguments"
            }

        ].concat(this.$rules.no_regex);

        this.$rules.block_arguments = [
            {
                token: "paren.rparen",
                regex: "\\|",
                next: "no_regex"
            }
        ].concat(this.$rules.function_arguments);

        this.$rules.bstring = [
            {
                token: "constant.language.escape",
                regex: escapedRe
            },
            {
                token: "string",
                regex: "\\\\$",
                next: "bstring"
            },
            ctxBegin({
                token: "paren.lparen",
                regex: "\\$\\{",
                next: "string_interp"
            }),
            ctxBegin({
                token: "paren.lparen",
                regex: "\\$",
                next: "bstring_interp_single"
            }),
            ctxEnd({
                token: "string",
                regex: "`"
            }),
            {
                defaultToken: "string"
            }
        ];

        this.$rules.qqstring = [
            {
                token: "constant.language.escape",
                regex: escapedRe
            },
            {
                token: "string",
                regex: "\\\\$",
                next: "qqstring"
            },
            ctxBegin({
                token: "paren.lparen",
                regex: "#\\{",
                next: "string_interp"
            }),
            ctxEnd({
                token: "string",
                regex: '"'
            }),
            {
                defaultToken: "string"
            }
        ];

        // collect all context-aware (or stateless), brace-less
        // states. This gives us most normal highlighting
        // for use within interpreted contexts
        // without interfering with context nesting
        var embeddableRules = [];
        for (var i = 0; i < this.$rules.no_regex.length; i++) {
            var rule = this.$rules.no_regex[i];
            var token = String(rule.token);
            if (token.indexOf('paren') == -1 && (!rule.next || rule.next.isContextAware)) {
                embeddableRules.push(rule);
            }
        }

        this.$rules.string_interp = [
            ctxEnd({
                token: "paren.rparen",
                regex: "\\}"
            }),
            ctxBegin({
                token: "paren.lparen",
                regex: '{',
                next: "string_interp"
            })
        ].concat(embeddableRules);

        // backtick strings can have single interpolation, which accept
        // \w+ followed by an optional set of function call parens
        this.$rules.bstring_interp_single = [
            {
                token: ["identifier", "paren.lparen"],
                regex: '(\\w+)(\\()',
                next: 'bstring_interp_single_call'
            },
            // identifier-only match ends this interp
            ctxEnd({
                token: "identifier",
                regex: "\\w*"
            })
        ];

        // the call part of a bstring_interp_single
        // is terminated by a close paren `)`, but
        // can have nested parens.
        this.$rules.bstring_interp_single_call = [
            ctxBegin({
                token: "paren.lparen",
                regex: "\\(",
                next: "bstring_interp_single_call"
            }),
            ctxEnd({
                token: "paren.rparen",
                regex: "\\)"
            })
        ].concat(embeddableRules);
    }
    oop.inherits(SJSHighlightRules, TextHighlightRules);

    exports.SJSHighlightRules = SJSHighlightRules;
});
