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public/vendor/pagedown/Markdown.Editor.js view on Meta::CPAN
chunk.after = this.stripLinkDefs(chunk.after, defsToAdd);
var defs = "";
var regex = /(\[)((?:\[[^\]]*\]|[^\[\]])*)(\][ ]?(?:\n[ ]*)?\[)(\d+)(\])/g;
var addDefNumber = function (def) {
refNumber++;
def = def.replace(/^[ ]{0,3}\[(\d+)\]:/, " [" + refNumber + "]:");
defs += "\n" + def;
};
// note that
// a) the recursive call to getLink cannot go infinite, because by definition
// of regex, inner is always a proper substring of wholeMatch, and
// b) more than one level of nesting is neither supported by the regex
// nor making a lot of sense (the only use case for nesting is a linked image)
var getLink = function (wholeMatch, before, inner, afterInner, id, end) {
inner = inner.replace(regex, getLink);
if (defsToAdd[id]) {
addDefNumber(defsToAdd[id]);
return before + inner + afterInner + refNumber + end;
}
return wholeMatch;
};
chunk.before = chunk.before.replace(regex, getLink);
if (linkDef) {
addDefNumber(linkDef);
}
else {
chunk.selection = chunk.selection.replace(regex, getLink);
}
var refOut = refNumber;
chunk.after = chunk.after.replace(regex, getLink);
if (chunk.after) {
chunk.after = chunk.after.replace(/\n*$/, "");
}
if (!chunk.after) {
chunk.selection = chunk.selection.replace(/\n*$/, "");
}
chunk.after += "\n\n" + defs;
return refOut;
};
// takes the line as entered into the add link/as image dialog and makes
// sure the URL and the optinal title are "nice".
function properlyEncoded(linkdef) {
return linkdef.replace(/^\s*(.*?)(?:\s+"(.+)")?\s*$/, function (wholematch, link, title) {
link = link.replace(/\?.*$/, function (querypart) {
return querypart.replace(/\+/g, " "); // in the query string, a plus and a space are identical
});
link = decodeURIComponent(link); // unencode first, to prevent double encoding
link = encodeURI(link).replace(/'/g, '%27').replace(/\(/g, '%28').replace(/\)/g, '%29');
link = link.replace(/\?.*$/, function (querypart) {
return querypart.replace(/\+/g, "%2b"); // since we replaced plus with spaces in the query part, all pluses that now appear where originally encoded
});
if (title) {
title = title.trim ? title.trim() : title.replace(/^\s*/, "").replace(/\s*$/, "");
title = title.replace(/"/g, "quot;").replace(/\(/g, "(").replace(/\)/g, ")").replace(/</g, "<").replace(/>/g, ">");
}
return title ? link + ' "' + title + '"' : link;
});
}
commandProto.doLinkOrImage = function (chunk, postProcessing, isImage) {
chunk.trimWhitespace();
chunk.findTags(/\s*!?\[/, /\][ ]?(?:\n[ ]*)?(\[.*?\])?/);
var background;
if (chunk.endTag.length > 1 && chunk.startTag.length > 0) {
chunk.startTag = chunk.startTag.replace(/!?\[/, "");
chunk.endTag = "";
this.addLinkDef(chunk, null);
}
else {
// We're moving start and end tag back into the selection, since (as we're in the else block) we're not
// *removing* a link, but *adding* one, so whatever findTags() found is now back to being part of the
// link text. linkEnteredCallback takes care of escaping any brackets.
chunk.selection = chunk.startTag + chunk.selection + chunk.endTag;
chunk.startTag = chunk.endTag = "";
if (/\n\n/.test(chunk.selection)) {
this.addLinkDef(chunk, null);
return;
}
var that = this;
// The function to be executed when you enter a link and press OK or Cancel.
// Marks up the link and adds the ref.
var linkEnteredCallback = function (link) {
background.parentNode.removeChild(background);
if (link !== null) {
// ( $1
// [^\\] anything that's not a backslash
// (?:\\\\)* an even number (this includes zero) of backslashes
// )
// (?= followed by
// [[\]] an opening or closing bracket
// )
//
// In other words, a non-escaped bracket. These have to be escaped now to make sure they
// don't count as the end of the link or similar.
// Note that the actual bracket has to be a lookahead, because (in case of to subsequent brackets),
// the bracket in one match may be the "not a backslash" character in the next match, so it
// should not be consumed by the first match.
// The "prepend a space and finally remove it" steps makes sure there is a "not a backslash" at the
// start of the string, so this also works if the selection begins with a bracket. We cannot solve
// this by anchoring with ^, because in the case that the selection starts with two brackets, this
// would mean a zero-width match at the start. Since zero-width matches advance the string position,
// the first bracket could then not act as the "not a backslash" for the second.
public/vendor/pagedown/Markdown.Editor.js view on Meta::CPAN
var commandMgr = this,
fakeSelection = false;
chunk.before = chunk.before.replace(/(\n|^)[ ]{0,3}([*+-]|\d+[.])[ \t]*\n$/, "\n\n");
chunk.before = chunk.before.replace(/(\n|^)[ ]{0,3}>[ \t]*\n$/, "\n\n");
chunk.before = chunk.before.replace(/(\n|^)[ \t]+\n$/, "\n\n");
// There's no selection, end the cursor wasn't at the end of the line:
// The user wants to split the current list item / code line / blockquote line
// (for the latter it doesn't really matter) in two. Temporarily select the
// (rest of the) line to achieve this.
if (!chunk.selection && !/^[ \t]*(?:\n|$)/.test(chunk.after)) {
chunk.after = chunk.after.replace(/^[^\n]*/, function (wholeMatch) {
chunk.selection = wholeMatch;
return "";
});
fakeSelection = true;
}
if (/(\n|^)[ ]{0,3}([*+-]|\d+[.])[ \t]+.*\n$/.test(chunk.before)) {
if (commandMgr.doList) {
commandMgr.doList(chunk);
}
}
if (/(\n|^)[ ]{0,3}>[ \t]+.*\n$/.test(chunk.before)) {
if (commandMgr.doBlockquote) {
commandMgr.doBlockquote(chunk);
}
}
if (/(\n|^)(\t|[ ]{4,}).*\n$/.test(chunk.before)) {
if (commandMgr.doCode) {
commandMgr.doCode(chunk);
}
}
if (fakeSelection) {
chunk.after = chunk.selection + chunk.after;
chunk.selection = "";
}
};
commandProto.doBlockquote = function (chunk, postProcessing) {
chunk.selection = chunk.selection.replace(/^(\n*)([^\r]+?)(\n*)$/,
function (totalMatch, newlinesBefore, text, newlinesAfter) {
chunk.before += newlinesBefore;
chunk.after = newlinesAfter + chunk.after;
return text;
});
chunk.before = chunk.before.replace(/(>[ \t]*)$/,
function (totalMatch, blankLine) {
chunk.selection = blankLine + chunk.selection;
return "";
});
chunk.selection = chunk.selection.replace(/^(\s|>)+$/, "");
chunk.selection = chunk.selection || this.getString("quoteexample");
// The original code uses a regular expression to find out how much of the
// text *directly before* the selection already was a blockquote:
/*
if (chunk.before) {
chunk.before = chunk.before.replace(/\n?$/, "\n");
}
chunk.before = chunk.before.replace(/(((\n|^)(\n[ \t]*)*>(.+\n)*.*)+(\n[ \t]*)*$)/,
function (totalMatch) {
chunk.startTag = totalMatch;
return "";
});
*/
// This comes down to:
// Go backwards as many lines a possible, such that each line
// a) starts with ">", or
// b) is almost empty, except for whitespace, or
// c) is preceeded by an unbroken chain of non-empty lines
// leading up to a line that starts with ">" and at least one more character
// and in addition
// d) at least one line fulfills a)
//
// Since this is essentially a backwards-moving regex, it's susceptible to
// catstrophic backtracking and can cause the browser to hang;
// see e.g. http://meta.stackoverflow.com/questions/9807.
//
// Hence we replaced this by a simple state machine that just goes through the
// lines and checks for a), b), and c).
var match = "",
leftOver = "",
line;
if (chunk.before) {
var lines = chunk.before.replace(/\n$/, "").split("\n");
var inChain = false;
for (var i = 0; i < lines.length; i++) {
var good = false;
line = lines[i];
inChain = inChain && line.length > 0; // c) any non-empty line continues the chain
if (/^>/.test(line)) { // a)
good = true;
if (!inChain && line.length > 1) // c) any line that starts with ">" and has at least one more character starts the chain
inChain = true;
} else if (/^[ \t]*$/.test(line)) { // b)
good = true;
} else {
good = inChain; // c) the line is not empty and does not start with ">", so it matches if and only if we're in the chain
}
if (good) {
match += line + "\n";
} else {
leftOver += match + line;
match = "\n";
}
}
if (!/(^|\n)>/.test(match)) { // d)
leftOver += match;
match = "";
}
}
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