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 * Distributed under the BSD license:
 *
 * Copyright (c) 2010, Ajax.org B.V.
 * All rights reserved.
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 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       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.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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define(function(require, exports, module) {
"use strict";

var dom = require("../lib/dom");
var oop = require("../lib/oop");
var lang = require("../lib/lang");
var EventEmitter = require("../lib/event_emitter").EventEmitter;

var Gutter = function(parentEl) {
    this.element = dom.createElement("div");
    this.element.className = "ace_layer ace_gutter-layer";
    parentEl.appendChild(this.element);
    this.setShowFoldWidgets(this.$showFoldWidgets);
    
    this.gutterWidth = 0;

    this.$annotations = [];
    this.$updateAnnotations = this.$updateAnnotations.bind(this);

    this.$cells = [];
};

(function() {

    oop.implement(this, EventEmitter);

    this.setSession = function(session) {
        if (this.session)
            this.session.removeEventListener("change", this.$updateAnnotations);
        this.session = session;
        if (session)
            session.on("change", this.$updateAnnotations);
    };

    this.addGutterDecoration = function(row, className){
        if (window.console)
            console.warn && console.warn("deprecated use session.addGutterDecoration");
        this.session.addGutterDecoration(row, className);
    };

    this.removeGutterDecoration = function(row, className){
        if (window.console)
            console.warn && console.warn("deprecated use session.removeGutterDecoration");
        this.session.removeGutterDecoration(row, className);
    };

    this.setAnnotations = function(annotations) {
        // iterate over sparse array
        this.$annotations = [];
        for (var i = 0; i < annotations.length; i++) {
            var annotation = annotations[i];
            var row = annotation.row;
            var rowInfo = this.$annotations[row];
            if (!rowInfo)
                rowInfo = this.$annotations[row] = {text: []};
           
            var annoText = annotation.text;
            annoText = annoText ? lang.escapeHTML(annoText) : annotation.html || "";

            if (rowInfo.text.indexOf(annoText) === -1)
                rowInfo.text.push(annoText);

            var type = annotation.type;
            if (type == "error")
                rowInfo.className = " ace_error";
            else if (type == "warning" && rowInfo.className != " ace_error")
                rowInfo.className = " ace_warning";
            else if (type == "info" && (!rowInfo.className))
                rowInfo.className = " ace_info";
        }
    };

    this.$updateAnnotations = function (delta) {
        if (!this.$annotations.length)
            return;
        var firstRow = delta.start.row;
        var len = delta.end.row - firstRow;
        if (len === 0) {
            // do nothing
        } else if (delta.action == 'remove') {
            this.$annotations.splice(firstRow, len + 1, null);
        } else {
            var args = new Array(len + 1);
            args.unshift(firstRow, 1);
            this.$annotations.splice.apply(this.$annotations, args);
        }
    };

    this.update = function(config) {
        var session = this.session;
        var firstRow = config.firstRow;
        var lastRow = Math.min(config.lastRow + config.gutterOffset,  // needed to compensate for hor scollbar
            session.getLength() - 1);
        var fold = session.getNextFoldLine(firstRow);
        var foldStart = fold ? fold.start.row : Infinity;
        var foldWidgets = this.$showFoldWidgets && session.foldWidgets;
        var breakpoints = session.$breakpoints;
        var decorations = session.$decorations;
        var firstLineNumber = session.$firstLineNumber;
        var lastLineNumber = 0;
        
        var gutterRenderer = session.gutterRenderer || this.$renderer;

        var cell = null;
        var index = -1;
        var row = firstRow;
        while (true) {
            if (row > foldStart) {
                row = fold.end.row + 1;
                fold = session.getNextFoldLine(row, fold);
                foldStart = fold ? fold.start.row : Infinity;
            }
            if (row > lastRow) {
                while (this.$cells.length > index + 1) {
                    cell = this.$cells.pop();
                    this.element.removeChild(cell.element);
                }
                break;
            }

            cell = this.$cells[++index];
            if (!cell) {
                cell = {element: null, textNode: null, foldWidget: null};
                cell.element = dom.createElement("div");
                cell.textNode = document.createTextNode('');
                cell.element.appendChild(cell.textNode);
                this.element.appendChild(cell.element);
                this.$cells[index] = cell;
            }

            var className = "ace_gutter-cell ";
            if (breakpoints[row])
                className += breakpoints[row];
            if (decorations[row])
                className += decorations[row];
            if (this.$annotations[row])
                className += this.$annotations[row].className;
            if (cell.element.className != className)
                cell.element.className = className;

            var height = session.getRowLength(row) * config.lineHeight + "px";
            if (height != cell.element.style.height)
                cell.element.style.height = height;

            if (foldWidgets) {
                var c = foldWidgets[row];
                // check if cached value is invalidated and we need to recompute
                if (c == null)
                    c = foldWidgets[row] = session.getFoldWidget(row);
            }

            if (c) {
                if (!cell.foldWidget) {
                    cell.foldWidget = dom.createElement("span");
                    cell.element.appendChild(cell.foldWidget);
                }
                var className = "ace_fold-widget ace_" + c;
                if (c == "start" && row == foldStart && row < fold.end.row)
                    className += " ace_closed";
                else
                    className += " ace_open";
                if (cell.foldWidget.className != className)
                    cell.foldWidget.className = className;

                var height = config.lineHeight + "px";
                if (cell.foldWidget.style.height != height)
                    cell.foldWidget.style.height = height;
            } else {
                if (cell.foldWidget) {
                    cell.element.removeChild(cell.foldWidget);
                    cell.foldWidget = null;
                }
            }
            
            var text = lastLineNumber = gutterRenderer
                ? gutterRenderer.getText(session, row)
                : row + firstLineNumber;
            if (text != cell.textNode.data)
                cell.textNode.data = text;

            row++;
        }

        this.element.style.height = config.minHeight + "px";

        if (this.$fixedWidth || session.$useWrapMode)
            lastLineNumber = session.getLength() + firstLineNumber;

        var gutterWidth = gutterRenderer 
            ? gutterRenderer.getWidth(session, lastLineNumber, config)
            : lastLineNumber.toString().length * config.characterWidth;
        
        var padding = this.$padding || this.$computePadding();
        gutterWidth += padding.left + padding.right;
        if (gutterWidth !== this.gutterWidth && !isNaN(gutterWidth)) {
            this.gutterWidth = gutterWidth;
            this.element.style.width = Math.ceil(this.gutterWidth) + "px";
            this._emit("changeGutterWidth", gutterWidth);
        }
    };

    this.$fixedWidth = false;
    
    this.$showLineNumbers = true;
    this.$renderer = "";
    this.setShowLineNumbers = function(show) {
        this.$renderer = !show && {
            getWidth: function() {return ""},
            getText: function() {return ""}
        };
    };
    
    this.getShowLineNumbers = function() {
        return this.$showLineNumbers;
    };
    
    this.$showFoldWidgets = true;
    this.setShowFoldWidgets = function(show) {
        if (show)
            dom.addCssClass(this.element, "ace_folding-enabled");
        else
            dom.removeCssClass(this.element, "ace_folding-enabled");

        this.$showFoldWidgets = show;
        this.$padding = null;
    };
    
    this.getShowFoldWidgets = function() {
        return this.$showFoldWidgets;
    };

    this.$computePadding = function() {
        if (!this.element.firstChild)
            return {left: 0, right: 0};
        var style = dom.computedStyle(this.element.firstChild);
        this.$padding = {};
        this.$padding.left = parseInt(style.paddingLeft) + 1 || 0;
        this.$padding.right = parseInt(style.paddingRight) || 0;
        return this.$padding;
    };

    this.getRegion = function(point) {
        var padding = this.$padding || this.$computePadding();
        var rect = this.element.getBoundingClientRect();
        if (point.x < padding.left + rect.left)
            return "markers";
        if (this.$showFoldWidgets && point.x > rect.right - padding.right)
            return "foldWidgets";
    };

}).call(Gutter.prototype);

exports.Gutter = Gutter;

});
