/*
 * Copyright (c) 2008 Ivan Fomichev
 *
 * Portions Copyright (c) 2007 Chris Purcell
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

if (!Parse) { var Parse = {}; }
if (!Parse.Simple) { Parse.Simple = {}; }

Parse.Simple.Base = function(root, options) {
    if (!arguments.length) { return; }

    this.root = new this.ruleConstructor(root);
    this.options = options;
};

Parse.Simple.Base.prototype = {
    ruleConstructor: null,
    root: null,
    options: null,

    parse: function(node, data, options) {
        if (options) {
            for (i in this.options) {
                if (typeof options[i] == 'undefined') { options[i] = this.options[i]; }
            }
        }
        else {
            options = this.options;
        }
        this.root.apply(node, data, options);
    }
};

Parse.Simple.Base.prototype.constructor = Parse.Simple.Base;

Parse.Simple.Base.Rule = function(params) {
    if (!arguments.length) { return; }

    for (var p in params) { this[p] = params[p]; }
    if (!this.children) { this.children = []; }
};

Parse.Simple.Base.prototype.ruleConstructor = Parse.Simple.Base.Rule;

Parse.Simple.Base.Rule.prototype = {
    regex: null,
    capture: null,
    replaceRegex: null,
    replaceString: null,
    tag: null,
    attrs: null,
    children: null,

    match: function(data, options) {
        return data.match(this.regex);
    },

    build: function(node, r, options) {
        var data;
        if (this.capture !== null) {
            data = r[this.capture];
        }

        var target;
        if (this.tag) {
            target = document.createElement(this.tag);
            node.appendChild(target);
        }
        else { target = node; }

        if (data) {
            if (this.replaceRegex) {
                data = data.replace(this.replaceRegex, this.replaceString);
            }
            this.apply(target, data, options);
        }

        if (this.attrs) {
            for (var i in this.attrs) {
                target.setAttribute(i, this.attrs[i]);
                if (i == 'class') { target.className = this.attrs[i]; } // for IE
            }
        }
        return this;
    },

    apply: function(node, data, options) {
        var tail = '' + data;
        var matches = [];

        if (!this.fallback.apply) {
            this.fallback = new this.constructor(this.fallback);
        }

        while (true) {
            var best = false;
            var rule  = false;
            for (var i = 0; i < this.children.length; i++) {
                if (typeof matches[i] == 'undefined') {
                    if (!this.children[i].match) {
                        this.children[i] = new this.constructor(this.children[i]);
                    }
                    matches[i] = this.children[i].match(tail, options);
                }
                if (matches[i] && (!best || best.index > matches[i].index)) {
                    best = matches[i];
                    rule = this.children[i];
                    if (best.index == 0) { break; }
                }
            }

            var pos = best ? best.index : tail.length;
            if (pos > 0) {
                this.fallback.apply(node, tail.substring(0, pos), options);
            }

            if (!best) { break; }

            if (!rule.build) { rule = new this.constructor(rule); }
            rule.build(node, best, options);

            var chopped = best.index + best[0].length;
            tail = tail.substring(chopped);
            for (var i = 0; i < this.children.length; i++) {
                if (matches[i]) {
                    if (matches[i].index >= chopped) {
                        matches[i].index -= chopped;
                    }
                    else {
                        matches[i] = void 0;
                    }
                }
            }
        }

        return this;
    },

    fallback: {
        apply: function(node, data, options) {
            node.appendChild(document.createTextNode(data));
        }
    }
};

Parse.Simple.Base.Rule.prototype.constructor = Parse.Simple.Base.Rule;

Parse.Simple.Creole = function(options) {
    var rx = {};
    rx.link = '[^\\]|~\\n]*(?:(?:\\](?!\\])|~.)[^\\]|~\\n]*)*';
    rx.linkText = '[^\\]~\\n]*(?:(?:\\](?!\\])|~.)[^\\]~\\n]*)*';
    rx.uriPrefix = '\\b(?:(?:https?|ftp)://|mailto:)';
    rx.uri = rx.uriPrefix + rx.link;
    rx.rawUri = rx.uriPrefix + '\\S*[^\\s!"\',.:;?]';
    rx.interwikiPrefix = '[\\w.]+:';
    rx.interwikiLink = rx.interwikiPrefix + rx.link;

    var formatLink = function(link, format) {
        format = format instanceof Array ? format : [ format ];
        if (typeof format[1] == 'undefined') { format[1] = ''; }
        return format[0] + link + format[1];
    };

    var g = {
        hr: { tag: 'hr', regex: /(^|\n)\s*----\s*(\n|$)/ },

        br: { tag: 'br', regex: /\\\\/ },

        preBlock: { tag: 'pre', capture: 2,
            regex: /(^|\n)\{\{\{\n((.*\n)*?)\}\}\}(\n|$)/,
            replaceRegex: /^ ([ \t]*\}\}\})/gm,
            replaceString: '$1' },
        tt: { tag: 'tt',
            regex: /\{\{\{(.*?\}\}\}+)/, capture: 1,
            replaceRegex: /\}\}\}$/, replaceString: '' },

        ulist: { tag: 'ul', capture: 0,
            regex: /(^|\n)([ \t]*\*[^*#].*(\n|$)([ \t]*[^\s*#].*(\n|$))*([ \t]*[*#]{2}.*(\n|$))*)+/ },
        olist: { tag: 'ol', capture: 0,
            regex: /(^|\n)([ \t]*#[^*#].*(\n|$)([ \t]*[^\s*#].*(\n|$))*([ \t]*[*#]{2}.*(\n|$))*)+/ },
        li: { tag: 'li', capture: 0,
            regex: /[ \t]*([*#]).+(\n[ \t]*[^*#\s].*)*(\n[ \t]*\1[*#].+)*/,
            replaceRegex: /(^|\n)[ \t]*[*#]/g, replaceString: '$1' },

        table: { tag: 'table', capture: 0,
            regex: /(^|\n)(\|.*?[ \t]*(\n|$))+/ },
        tr: { tag: 'tr', capture: 2, regex: /(^|\n)(\|.*?)\|?[ \t]*(\n|$)/ },
        th: { tag: 'th', regex: /\|+=([^|]*)/, capture: 1 },
        td: { tag: 'td', capture: 1,
            regex: /\|+([^|~]*(~(.|(?=\n)|$)[^|~]*)*)/ },

        singleLine: { regex: /.+/, capture: 0 },
        paragraph: { tag: 'p', capture: 0,
            regex: /(^|\n)([ \t]*\S.*(\n|$))+/ },
        text: { capture: 0, regex: /(^|\n)([ \t]*[^\s].*(\n|$))+/ },

        strong: { tag: 'strong', capture: 1,
            regex: /\*\*([^*~]*((\*(?!\*)|~(.|(?=\n)|$))[^*~]*)*)(\*\*|\n|$)/ },
        em: { tag: 'em', capture: 1,
            regex: '\\/\\/(((?!' + rx.uriPrefix + ')[^\\/~])*' +
                   '((' + rx.rawUri + '|\\/(?!\\/)|~(.|(?=\\n)|$))' +
                   '((?!' + rx.uriPrefix + ')[^\\/~])*)*)(\\/\\/|\\n|$)' },

        img: { regex: '\\{\\{((?!\\{)[^|}\\n]*(?:}(?!})[^|}\\n]*)*)\\|' +
                      '([^}~\\n]*((}(?!})|~.)[^}~\\n]*)*)}}',
            build: function(node, r, options) {
                var img = document.createElement('img');
                img.src = r[1];
                img.alt = r[2].replace(/~(.)/g, '$1');
                node.appendChild(img);
            } },

        namedUri: { regex: '\\[\\[(' + rx.uri + ')\\|(' + rx.linkText + ')\\]\\]',
            build: function(node, r, options) {
                var link = document.createElement('a');
                link.href = r[1];
                if (options && options.isPlainUri) {
                    link.appendChild(document.createTextNode(r[2]));
                }
                else {
                    this.apply(link, r[2], options);
                }
                node.appendChild(link);
            } },

        namedLink: { regex: '\\[\\[(' + rx.link + ')\\|(' + rx.linkText + ')\\]\\]',
            build: function(node, r, options) {
                var link = document.createElement('a');

                link.href = options && options.linkFormat
                    ? formatLink(r[1].replace(/~(.)/g, '$1'), options.linkFormat)
                    : r[1].replace(/~(.)/g, '$1');
                this.apply(link, r[2], options);

                node.appendChild(link);
            } },

        unnamedUri: { regex: '\\[\\[(' + rx.uri + ')\\]\\]',
            build: 'dummy' },
        unnamedLink: { regex: '\\[\\[(' + rx.link + ')\\]\\]',
            build: 'dummy' },
        unnamedInterwikiLink: { regex: '\\[\\[(' + rx.interwikiLink + ')\\]\\]',
            build: 'dummy' },

        rawUri: { regex: '(' + rx.rawUri + ')',
            build: 'dummy' },

        escapedSequence: { regex: '~(' + rx.rawUri + '|.)', capture: 1,
            tag: 'span', attrs: { 'class': 'escaped' } },
        escapedSymbol: { regex: /~(.)/, capture: 1,
            tag: 'span', attrs: { 'class': 'escaped' } }
    };
    g.unnamedUri.build = g.rawUri.build = function(node, r, options) {
        if (!options) { options = {}; }
        options.isPlainUri = true;
        g.namedUri.build.call(this, node, Array(r[0], r[1], r[1]), options);
    };
    g.unnamedLink.build = function(node, r, options) {
        g.namedLink.build.call(this, node, Array(r[0], r[1], r[1]), options);
    };
    g.namedInterwikiLink = { regex: '\\[\\[(' + rx.interwikiLink + ')\\|(' + rx.linkText + ')\\]\\]',
        build: function(node, r, options) {
                var link = document.createElement('a');

                var m, f;
                if (options && options.interwiki) {
                m = r[1].match(/(.*?):(.*)/);
                f = options.interwiki[m[1]];
            }

            if (typeof f == 'undefined') {
                if (!g.namedLink.apply) {
                    g.namedLink = new this.constructor(g.namedLink);
                }
                return g.namedLink.build.call(g.namedLink, node, r, options);
            }

            link.href = formatLink(m[2].replace(/~(.)/g, '$1'), f);

            this.apply(link, r[2], options);

            node.appendChild(link);
        }
    };
    g.unnamedInterwikiLink.build = function(node, r, options) {
        g.namedInterwikiLink.build.call(this, node, Array(r[0], r[1], r[1]), options);
    };
    g.namedUri.children = g.unnamedUri.children = g.rawUri.children =
            g.namedLink.children = g.unnamedLink.children =
            g.namedInterwikiLink.children = g.unnamedInterwikiLink.children =
        [ g.escapedSymbol, g.img ];

    for (var i = 1; i <= 6; i++) {
        g['h' + i] = { tag: 'h' + i, capture: 2,
            regex: '(^|\\n)[ \\t]*={' + i + '}[ \\t]' +
                   '([^~]*?(~(.|(?=\\n)|$))*)[ \\t]*=*\\s*(\\n|$)'
        };
    }

    g.ulist.children = g.olist.children = [ g.li ];
    g.li.children = [ g.ulist, g.olist ];
    g.li.fallback = g.text;

    g.table.children = [ g.tr ];
    g.tr.children = [ g.th, g.td ];
    g.td.children = [ g.singleLine ];
    g.th.children = [ g.singleLine ];

    g.h1.children = g.h2.children = g.h3.children =
            g.h4.children = g.h5.children = g.h6.children =
            g.singleLine.children = g.paragraph.children =
            g.text.children = g.strong.children = g.em.children =
        [ g.escapedSequence, g.strong, g.em, g.br, g.rawUri,
            g.namedUri, g.namedInterwikiLink, g.namedLink,
            g.unnamedUri, g.unnamedInterwikiLink, g.unnamedLink,
            g.tt, g.img ];

    g.root = {
        children: [ g.h1, g.h2, g.h3, g.h4, g.h5, g.h6,
            g.hr, g.ulist, g.olist, g.preBlock, g.table ],
        fallback: { children: [ g.paragraph ] }
    };

    Parse.Simple.Base.call(this, g.root, options);
};

Parse.Simple.Creole.prototype = new Parse.Simple.Base();

Parse.Simple.Creole.prototype.constructor = Parse.Simple.Creole;
