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toMd() improved #184

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9d0ae18
Added linebreak before ordered/unordered list when exporting markdown
sergey-shambir Mar 4, 2017
abd47c2
Improved toMd output quality
sergey-shambir May 9, 2017
6f768d7
Fixed warnings from eslint
sergey-shambir May 9, 2017
b8a3f3b
Fixed warnings from eslint
sergey-shambir May 9, 2017
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287 changes: 261 additions & 26 deletions src/pen.js
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Original file line number Diff line number Diff line change
Expand Up @@ -541,7 +541,7 @@
var form = inputElement.form;
var me = this;
form.addEventListener("submit", function() {
inputElement.value = me.config.saveAsMarkdown ? me.toMd(me.config.editor.innerHTML) : me.config.editor.innerHTML;
inputElement.value = me.config.saveAsMarkdown ? me.toMd() : me.config.editor.innerHTML;
});
};

Expand Down Expand Up @@ -818,34 +818,269 @@
return defaults.editor;
};

// export content as markdown
var regs = {
a: [/<a\b[^>]*href=["']([^"]+|[^']+)\b[^>]*>(.*?)<\/a>/ig, '[$2]($1)'],
img: [/<img\b[^>]*src=["']([^\"+|[^']+)[^>]*>/ig, '![]($1)'],
b: [/<b\b[^>]*>(.*?)<\/b>/ig, '**$1**'],
i: [/<i\b[^>]*>(.*?)<\/i>/ig, '***$1***'],
h: [/<h([1-6])\b[^>]*>(.*?)<\/h\1>/ig, function(a, b, c) {
return '\n' + ('######'.slice(0, b)) + ' ' + c + '\n';
}],
li: [/<(li)\b[^>]*>(.*?)<\/\1>/ig, '* $2\n'],
blockquote: [/<(blockquote)\b[^>]*>(.*?)<\/\1>/ig, '\n> $2\n'],
pre: [/<pre\b[^>]*>(.*?)<\/pre>/ig, '\n```\n$1\n```\n'],
code: [/<code\b[^>]*>(.*?)<\/code>/ig, '\n`\n$1\n`\n'],
p: [/<p\b[^>]*>(.*?)<\/p>/ig, '\n$1\n'],
hr: [/<hr\b[^>]*>/ig, '\n---\n']
};
(function() {
var PenHtmlToMarkdown = function(editorNode) {
if (!editorNode) throw new Error('Invalid argument - undefined editor DOM node');

this._states = [];
this._state = {
isInsideCode: false,
marker: ' ',
markerNo: 0,
listLevel: 0,
listIndent: '',
href: '',
};
this._markdown = '';
this.toMd = function() {
this._visit(editorNode);
return this._markdown.trim();
};
};

PenHtmlToMarkdown.prototype._pushState = function() {
var newState = Object.assign({}, this._state);
this._states.push(this._state);
this._state = newState;
};

PenHtmlToMarkdown.prototype._popState = function() {
this._state = this._states.pop();
};

PenHtmlToMarkdown.prototype.actionCode = {
beforeEnter: function () {
if (!this._state.isInsideCode)
this._markdown += '`';
},
afterEnter: function () {
this._state.isInsideCode = true;
},
afterExit: function () {
if (!this._state.isInsideCode)
this._markdown += '`';
},
};

PenHtmlToMarkdown.prototype.actionPre = {
beforeEnter: function () {
if (!this._state.isInsideCode)
this._markdown += '\n```\n';
},
afterEnter: function () {
this._state.isInsideCode = true;
},
afterExit: function () {
if (!this._state.isInsideCode)
this._markdown += '```\n\n';
},
};

PenHtmlToMarkdown.prototype.actionParagraph = {
afterExit: function () {
if (!this._state.isInsideCode)
this._markdown += '\n';
}
};

Pen.prototype.toMd = function() {
var html = this.getContent()
.replace(/\n+/g, '') // remove line break
.replace(/<([uo])l\b[^>]*>(.*?)<\/\1l>/ig, '$2'); // remove ul/ol
PenHtmlToMarkdown.prototype.actionBlockquote = {
afterEnter: function () {
this._markdown += '>';
},
afterExit: function () {
this._markdown += '\n';
}
};

PenHtmlToMarkdown.prototype.actionText = {
afterEnter: function (node) {
var text = node.wholeText;
if (!this._state.isInsideCode) {
text = text.replace(/\n+/g, ' ');
}
this._markdown += text;
}
};

PenHtmlToMarkdown.prototype.actionUnorderedList = {
afterEnter: function () {
this._markdown += '\n';
this._state.marker = '*';
this._state.listIndent = ' '.repeat(4 * this._state.listLevel);
this._state.listLevel += 1;
},
afterExit: function () {
this._markdown += '\n';
},
};

for(var p in regs) {
if (regs.hasOwnProperty(p))
html = html.replace.apply(html, regs[p]);
PenHtmlToMarkdown.prototype.actionOrderedList = {
afterEnter: function () {
this._markdown += '\n';
this._state.marker = '1.';
this._state.markerNo = 1;
this._state.listIndent = ' '.repeat(4 * this._state.listLevel);
this._state.listLevel += 1;
},
afterChild: function () {
this._state.markerNo += 1;
this._state.marker = this._state.markerNo.toString() + '.';
},
afterExit: function () {
this._markdown += '\n';
},
};

PenHtmlToMarkdown.prototype.actionListItem = {
afterEnter: function () {
this._markdown += this._state.listIndent + this._state.marker + " ";
},
afterExit: function () {
this._markdown += '\n';
}
};

PenHtmlToMarkdown.prototype.actionLink = {
afterEnter: function (node) {
this._state.href = node.attributes.getNamedItem("href").value;
this._markdown += '[';
},
beforeExit: function () {
this._markdown += '](' + this._state.href + ')';
},
};

PenHtmlToMarkdown.prototype.actionBold = {
afterEnter: function () {
this._markdown += '**';
},
beforeExit: function () {
this._markdown += '**';
}
};

PenHtmlToMarkdown.prototype.actionItalic = {
afterEnter: function () {
this._markdown += '***';
},
beforeExit: function () {
this._markdown += '***';
}
};

PenHtmlToMarkdown.prototype.actionImg = {
afterEnter: function (node) {
var src = node.attributes.getNamedItem("src").value;
var alt = node.attributes.getNamedItem("alt").value;
var parser = document.createElement('a');
parser.href = src;
src = parser.pathname + parser.search + parser.hash;

this._markdown += '![' + alt + '](' + src + ')';
},
};

PenHtmlToMarkdown.prototype.actionHorizontalLine = {
afterEnter: function () {
this._markdown += '\n---\n';
},
};

PenHtmlToMarkdown.prototype.actionLinebreak = {
afterEnter: function () {
this._markdown += '\n';
},
};

function makeHeaderAction(level) {
return {
beforeEnter: function () {
this._markdown += '\n' + '#'.repeat(level) + ' ';
},
afterExit: function () {
this._markdown += '\n\n';
}
};
}
return html.replace(/\*{5}/g, '**');
};

PenHtmlToMarkdown.prototype.actionH1 = makeHeaderAction(1);
PenHtmlToMarkdown.prototype.actionH2 = makeHeaderAction(2);
PenHtmlToMarkdown.prototype.actionH3 = makeHeaderAction(3);
PenHtmlToMarkdown.prototype.actionH4 = makeHeaderAction(4);
PenHtmlToMarkdown.prototype.actionH5 = makeHeaderAction(5);
PenHtmlToMarkdown.prototype.actionH6 = makeHeaderAction(6);

PenHtmlToMarkdown.prototype._selectAction = function(node) {
var dispatchTable = {
'CODE': this.actionCode,
'PRE': this.actionPre,
'P': this.actionParagraph,
'BLOCKQUOTE': this.actionBlockquote,
'UL': this.actionUnorderedList,
'OL': this.actionOrderedList,
'LI': this.actionListItem,
'A': this.actionLink,
'IMG': this.actionImg,
'B': this.actionBold,
'I': this.actionItalic,
'HR': this.actionHorizontalLine,
'BR': this.actionLinebreak,
'H1': this.actionH1,
'H2': this.actionH2,
'H3': this.actionH3,
'H4': this.actionH4,
'H5': this.actionH5,
'H6': this.actionH6,
'DIV': null,
'SPAN': null,
};

switch (node.nodeType)
{
case Node.TEXT_NODE:
return this.actionText;
case Node.ELEMENT_NODE:
var action = dispatchTable[node.tagName];
if (action !== undefined) {
return action;
}
console.log("unhandled tag:", node.tagName);
break;
}
return null;
};

PenHtmlToMarkdown.prototype._visit = function(node) {
var action = this._selectAction(node);
if (action) {
if (action.beforeEnter)
action.beforeEnter.call(this, node);
this._pushState();
if (action.afterEnter)
action.afterEnter.call(this, node);
}

var self = this;
node.childNodes.forEach(function (child) {
self._visit(child);
if (action && action.afterChild)
action.afterChil.call(self, node);
});

if (action) {
if (action.beforeExit)
action.beforeExit.call(this, node);
this._popState();
if (action.afterExit)
action.afterExit.call(this, node);
}
};

Pen.prototype.toMd = function() {
var converter = new PenHtmlToMarkdown(this.config.editor);
return converter.toMd();
};
}());

// make it accessible
if (doc.getSelection) {
Expand Down