path: root/common/content/mappings.js

/***** BEGIN LICENSE BLOCK ***** {{{
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/** @scope modules */

// Do NOT create instances of this class yourself, use the helper method
// mappings.add() instead
function Map(modes, cmds, description, action, extraInfo) //{{{
{
    if (!modes || (!cmds || !cmds.length) || !action)
        return null;

    if (!extraInfo)
        extraInfo = {};

    this.modes = modes;
    // only store keysyms with uppercase modifier strings
    this.names = cmds.map(function (cmd) cmd.replace(/[casm]-/g, String.toUpperCase));
    this.action = action;

    this.flags = extraInfo.flags || 0;
    this.description = description || "";
    this.rhs = extraInfo.rhs || null;
    this.noremap = extraInfo.noremap || false;
    this.silent = extraInfo.silent || false;
};

Map.prototype = {

    hasName: function (name)
    {
        return this.names.indexOf(name) >= 0;
    },

    execute: function (motion, count, argument)
    {
        let args = [];

        if (this.flags & Mappings.flags.MOTION)
            args.push(motion);
        if (this.flags & Mappings.flags.COUNT)
            args.push(count);
        if (this.flags & Mappings.flags.ARGUMENT)
            args.push(argument);

        let self = this;
        // FIXME: Kludge.
        if (this.names[0] != ".")
            mappings.repeat = function () self.action.apply(self, args);

        return this.action.apply(this, args);
    }

}; //}}}

/**
 * @instance mappings
 */
function Mappings() //{{{
{
    ////////////////////////////////////////////////////////////////////////////////
    ////////////////////// PRIVATE SECTION /////////////////////////////////////////
    /////////////////////////////////////////////////////////////////////////////{{{

    var main = []; // default mappings
    var user = []; // user created mappings

    for (let mode in modes)
    {
        main[mode] = [];
        user[mode] = [];
    }

    function addMap(map, userMap)
    {
        let where = userMap ? user : main;
        map.modes.forEach(function (mode) {
                if (!(mode in where))
                    where[mode] = [];
                where[mode].push(map);
        });
    }

    function getMap(mode, cmd, stack)
    {
        let maps = stack[mode] || [];

        for (let [,map] in Iterator(maps))
        {
            if (map.hasName(cmd))
                return map;
        }

        return null;
    }

    function removeMap(mode, cmd)
    {
        let maps = user[mode] || [];
        let names;

        for (let [i, map] in Iterator(maps))
        {
            for (let [j, name] in Iterator(map.names))
            {
                if (name == cmd)
                {
                    map.names.splice(j, 1);
                    if (map.names.length == 0)
                        maps.splice(i, 1);
                    return;
                }
            }
        }
    }

    function expandLeader(keyString) keyString.replace(/<Leader>/i, mappings.getMapLeader())

    // Return all mappings present in all @modes
    function mappingsIterator(modes, stack)
    {
        modes = modes.slice();
        return (map for ([i, map] in Iterator(stack[modes.shift()]))
            if (modes.every(function (mode) stack[mode].some(
                        function (m) m.rhs == map.rhs && m.names[0] == map.names[0]))))
    }

    function addMapCommands(ch, modes, modeDescription)
    {
        // 0 args -> list all maps
        // 1 arg  -> list the maps starting with args
        // 2 args -> map arg1 to arg*
        function map(args, mode, noremap)
        {
            if (!args.length)
            {
                mappings.list(mode);
                return;
            }

            // ?:\s+ <- don't remember; (...)? optional = rhs
            let [lhs, rhs] = args;

            if (!rhs) // list the mapping
            {
                mappings.list(mode, expandLeader(lhs));
            }
            else
            {
                for (let [,m] in Iterator(mode))
                {
                    mappings.addUserMap([m], [lhs],
                            "User defined mapping",
                            function (count) { events.feedkeys((count > 1 ? count : "") + this.rhs, this.noremap, this.silent); },
                            {
                                flags: Mappings.flags.COUNT,
                                rhs: rhs,
                                noremap: !!noremap,
                                silent: "<silent>" in args
                            });
                }
            }
        }

        modeDescription = modeDescription ? " in " + modeDescription + " mode" : "";

        const opts = {
                completer: function (context, args) completion.userMapping(context, args, modes),
                options: [
                    [["<silent>", "<Silent>"],  commands.OPTION_NOARG]
                ],
                literal: 1,
                serial: function ()
                {
                    let noremap = this.name.indexOf("noremap") > -1;
                    return [
                        {
                            command: this.name,
                            options: map.silent ? { "<silent>": null } : {},
                            arguments: [map.names[0]],
                            literalArg: map.rhs
                        }
                        for (map in mappingsIterator(modes, user))
                        if (map.rhs && map.noremap == noremap)
                    ]
                }
        };

        commands.add([ch ? ch + "m[ap]" : "map"],
            "Map a key sequence" + modeDescription,
            function (args) { map(args, modes, false); },
            opts);

        commands.add([ch + "no[remap]"],
            "Map a key sequence without remapping keys" + modeDescription,
            function (args) { map(args, modes, true); },
            opts);

        commands.add([ch + "mapc[lear]"],
            "Remove all mappings" + modeDescription,
            function () { modes.forEach(function (mode) { mappings.removeAll(mode); }); },
            { argCount: "0" });

        commands.add([ch + "unm[ap]"],
            "Remove a mapping" + modeDescription,
            function (args)
            {
                args = args[0];

                let found = false;
                for (let [,mode] in Iterator(modes))
                {
                    if (mappings.hasMap(mode, args))
                    {
                        mappings.remove(mode, args);
                        found = true;
                    }
                }
                if (!found)
                    liberator.echoerr("E31: No such mapping");
            },
            {
                argCount: "1",
                completer: function (context, args) completion.userMapping(context, args, modes)
            });
    }

    /////////////////////////////////////////////////////////////////////////////}}}
    ////////////////////// COMMANDS ////////////////////////////////////////////////
    /////////////////////////////////////////////////////////////////////////////{{{

    addMapCommands("",  [modes.NORMAL], "");
    addMapCommands("c", [modes.COMMAND_LINE], "command line");
    addMapCommands("i", [modes.INSERT, modes.TEXTAREA], "insert");
    if (liberator.has("mail"))
        addMapCommands("m", [modes.MESSAGE], "message");

    /////////////////////////////////////////////////////////////////////////////}}}
    ////////////////////// PUBLIC SECTION //////////////////////////////////////////
    /////////////////////////////////////////////////////////////////////////////{{{

    liberator.registerObserver("load_completion", function ()
    {
        completion.setFunctionCompleter(mappings.get,
        [
            null,
            function (context, obj, args)
            {
                let mode = args[0]
                return util.Array.flatten(
                [
                    [[name, map.description] for ([i, name] in Iterator(map.names))]
                    for ([i, map] in Iterator(user[mode].concat(main[mode])))
                ])
            }
        ]);
    });

    // FIXME:
    Mappings.flags = {
        ALLOW_EVENT_ROUTING: 1 << 0, // if set, return true inside the map command to pass the event further to Firefox
        MOTION:              1 << 1,
        COUNT:               1 << 2,
        ARGUMENT:            1 << 3
    };

    return {

        // NOTE: just normal mode for now
        __iterator__: function () mappingsIterator([modes.NORMAL], main),

        // used by :mkvimperatorrc to save mappings
        getUserIterator: function (mode) mappingsIterator(mode, user),

        add: function (modes, keys, description, action, extra)
        {
            addMap(new Map(modes, keys, description, action, extra), false);
        },

        addUserMap: function (modes, keys, description, action, extra)
        {
            keys = keys.map(expandLeader);
            let map = new Map(modes, keys, description || "User defined mapping", action, extra);

            // remove all old mappings to this key sequence
            for (let [,name] in Iterator(map.names))
            {
                for (let [,mode] in Iterator(map.modes))
                    removeMap(mode, name);
            }

            addMap(map, true);
        },

        get: function (mode, cmd)
        {
            mode = mode || modes.NORMAL;
            return getMap(mode, cmd, user) || getMap(mode, cmd, main);
        },

        getDefault: function (mode, cmd)
        {
            mode = mode || modes.NORMAL;
            return getMap(mode, cmd, main);
        },

        // returns an array of mappings with names which START with "cmd" (but are NOT "cmd")
        getCandidates: function (mode, cmd)
        {
            let mappings = user[mode].concat(main[mode]);
            let matches = [];

            for (let [,map] in Iterator(mappings))
            {
                for (let [,name] in Iterator(map.names))
                {
                    if (name.indexOf(cmd) == 0 && name.length > cmd.length)
                    {
                        // for < only return a candidate if it doesn't look like a <c-x> mapping
                        if (cmd != "<" || !/^<.+>/.test(name))
                            matches.push(map);
                    }
                }
            }

            return matches;
        },

        getMapLeader: function ()
        {
            let leaderRef = liberator.variableReference("mapleader");
            return leaderRef[0] ? leaderRef[0][leaderRef[1]] : "\\";
        },

        // returns whether the user added a custom user map
        hasMap: function (mode, cmd)
        {
            return user[mode].some(function (map) map.hasName(cmd));
        },

        remove: function (mode, cmd)
        {
            removeMap(mode, cmd);
        },

        removeAll: function (mode)
        {
            user[mode] = [];
        },

        list: function (modes, filter)
        {
            let modeSign = "";
            modes.forEach(function (mode)
            {
                if (mode == modes.NORMAL)
                    modeSign += "n";
                if ((mode == modes.INSERT || mode == modes.TEXTAREA) && modeSign.indexOf("i") == -1)
                    modeSign += "i";
                if (mode == modes.COMMAND_LINE)
                    modeSign += "c";
                if (mode == modes.MESSAGRE)
                    modeSign += "m";
            });

            let maps = mappingsIterator(modes, user);
            if (filter)
                maps = [map for (map in maps) if (map.names[0] == filter)];

            let list = <table>
                    {
                        template.map(maps, function (map)
                            template.map(map.names, function (name)
                            <tr>
                                <td>{modeSign} {name}</td>
                                <td>{map.noremap ? "*" : " "}</td>
                                <td>{map.rhs || "function () { ... }"}</td>
                            </tr>))
                    }
                    </table>;

            // TODO: Move this to an ItemList to show this automatically
            if (list.*.length() == list.text().length())
            {
                liberator.echomsg("No mapping found");
                return;
            }
            commandline.echo(list, commandline.HL_NORMAL, commandline.FORCE_MULTILINE);
        }

    };
    //}}}
}; //}}}

// vim: set fdm=marker sw=4 ts=4 et: