text markdown with *bold*, ~italic~, _underlined_ and -strikethrough-

js/twister_formatpost.js

@@ -226,6 +226,133 @@ function htmlFormatMsg(msg, mentions) {
         return i;
     }
 
+    function markdown(str, chr, tag) {
+        function whiteSpace(i, j) {
+            j++;
+            for (i += 1; i < j; i++) {
+                if (p[i].w)
+                    return true;
+            }
+
+            return false;
+        }
+
+        var i, j, t;
+        var w = false;
+        var p = [];
+
+        // collecting chars position data
+        for (i = 0; i < str.length; i++) {
+            if (str[i] === chr) {
+                for (j = i + 1; j < str.length; j++) {
+                    if (str[j] !== chr)
+                        break;
+                }
+                if (whiteSpaces.indexOf(str[i - 1]) === -1 || whiteSpaces.indexOf(str[j]) === -1) {
+                    if (whiteSpaces.indexOf(str[i - 1]) > -1 || i === 0)
+                        t = -1;
+                    else if (whiteSpaces.indexOf(str[j]) > -1 || i === str.length - 1)
+                        t = 1;
+                    else if (stopCharsMarkDown.indexOf(str[i - 1]) > -1) {
+                        if (stopCharsMarkDown.indexOf(str[j]) === -1)
+                            t = -1;
+                        else {
+                            for (t = j + 1; t < str.length; t++) {
+                                if (whiteSpaces.indexOf(str[t]) > -1) {
+                                    if ((2 * j - t) < 0 || whiteSpaces.indexOf(str[2 * j - t]) === -1) {
+                                        t = 1;
+                                        break;
+                                    }
+                                } else if (stopCharsMarkDown.indexOf(str[t]) === -1) {
+                                    if ((2 * j - t) < 0 || whiteSpaces.indexOf(str[2 * j - t]) > -1) {
+                                        t = -1;
+                                        break;
+                                    }
+                                }
+                            }
+                            if (t = str.length)
+                                t = 1;
+                        }
+                    } else if (stopCharsMarkDown.indexOf(str[j]) > -1)
+                        t = 1;
+                    else
+                        t = 0;
+                    p.push({i: i, k: j - i, t: t, w: w, a: -1, p: -1});
+                    w = false;
+                }
+                i = j;
+            } else if (!w && whiteSpaces.indexOf(str[i]) > -1) {
+                w = true;
+            }
+        }
+
+        // calculating dependencies
+        for (i = 0; i < p.length; i++) {
+            if (p[i].t < 1 && p[i].a === -1) {
+                t = i;
+                for (j = i + 1; j < p.length; j++) {
+                    if (p[i].t === 0 && whiteSpace(i, j)) {
+                        i = j - 1;
+                        break;
+                    } else if (p[j].t < 1 && p[j].a === -1) {
+                        p[t].p = j;
+                        t = j;
+                    } else if (p[j].t === 1 && p[j].a === -1) {
+                        p[i].a = j;
+                        p[j].a = i;
+                        i = j;
+                        break;
+                    }
+                }
+            }
+        }
+        for (i = 0; i < p.length; i++) {
+            if (p[i].t === -1 && p[i].a === -1) {
+                for (j = p[i].p; j > -1; j = p[j].p) {
+                    if (whiteSpace(i, j)) {
+                        i = j - 1;
+                        break;
+                    } else if (p[j].t === 0
+                        && !(p[j].p > -1 && p[p[j].p].t === 0 && !whiteSpace(j, p[j].p))) {
+                        p[j].a = i;
+                        p[i].a = j;
+                        i = j;
+                        break;
+                    }
+                }
+            }
+        }
+
+        // changing the string
+        for (i = 0; i < p.length; i++) {
+            if (p[i].a > -1) {
+                if (p[i].t === -1 || (p[i].t === 0 && p[i].a > i)) {
+                    if (p[i].k > 1)
+                        html.push('<' + tag + '>' + Array(p[i].k).join(chr));
+                    else
+                        html.push('<' + tag + '>');
+                } else if (p[i].t === 1 || (p[i].t === 0 && p[i].a < i)) {
+                    if (p[i].k > 1)
+                        html.push(Array(p[i].k).join(chr) + '</' + tag + '>');
+                    else
+                        html.push('</' + tag + '>');
+                } else {
+                    if (p[i].k > 1)
+                        html.push(Array(p[i].k + 1).join(chr));
+                    else
+                        html.push(chr);
+                }
+                    strEncoded = '>' + (html.length - 1).toString() + '<';
+                    str = str.slice(0, p[i].i) + strEncoded + str.slice(p[i].i + p[i].k);
+                    l = strEncoded.length - p[i].k;
+                    for (j = i + 1; j < p.length; j++)
+                        p[j].i += l;
+            }
+        }
+
+        return str;
+    }
+
     function htmlSplitCounter(str) {
         html.push('<span class="splited-post-counter">' + str + '</span>');
 
@@ -233,12 +360,13 @@ function htmlFormatMsg(msg, mentions) {
     }
 
     var mentionsChars = 'abcdefghijklmnopqrstuvwxyz_0123456789';
-    var stopCharsTrailing = '/\\.,:;?!*%\'"[](){}^|«»…\u201C\u201D\u2026\u2014\u4E00\u3002\uFF0C\uFF1A\uFF1F\uFF01\u3010\u3011';
+    var stopCharsTrailing = '/\\*.,:;?!%\'"[](){}^|«»…\u201C\u201D\u2026\u2014\u4E00\u3002\uFF0C\uFF1A\uFF1F\uFF01\u3010\u3011';
     var stopCharsTrailingUrl = stopCharsTrailing.slice(1);
     var whiteSpaces = ' \f\n\r\t\v​\u00A0\u1680\u180E\u2000​\u2001\u2002​\u2003\u2004\u2005\u2006​\u2007\u2008​\u2009\u200A\u2028\u2029​\u202F\u205F\u3000';
     var stopCharsLeft = '<' + whiteSpaces;
     var stopCharsRight = '>' + whiteSpaces;
     var stopCharsRightHashtags = stopCharsRight + stopCharsTrailing;
+    var stopCharsMarkDown = '~_-+=<>&' + stopCharsTrailing + whiteSpaces;
     var j, str, strEncoded;
     var html = [];
 
@@ -340,7 +468,11 @@ function htmlFormatMsg(msg, mentions) {
         }
     }
 
-    msg = msg
+    msg = markdown(markdown(markdown(markdown(msg,
+        '*', 'b'),  // bold
+        '~', 'i'),  // italic
+        '_', 'u'),  // underlined
+        '-', 's')  // striketrough
         .replace(/\(\d{1,2}\/\d{1,2}\)$/, htmlSplitCounter)
         .replace(/&(?!lt;|gt;)/g, '&amp;')  // FIXME in many cases there is no need to escape ampersand in HTML 5
         .replace(/"/g, '&quot;')
@@ -363,11 +495,8 @@ function htmlFormatMsg(msg, mentions) {
         msg = msg.replace(/\n/g, '<br />');
 
     // TODO: add options for emotions; msg = $.emotions(msg);
-    // TODO: add at least basic markdown (optional) with syntax like this:
-        // *text* -> bold text
-        // ~text~ -> italic text
-        // _text_ -> underlined text
-        // -text- -> strikethrough text
+    // TODO make markdown optionally mutable ?
+        // some escaping tag
 
     return msg;
 }