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Change-Id: I99ee6f8b4bdc372437ee60d1feab931487fe55c4
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It was possible to end up with a dangling pointer in m_listStack.
This is now avoided by using QPointer and doing nullptr checks before
accessing any QTextList pointer stored there.
We have 2 specimens of garbage that caused crashes before; now they don't.
But only fuzz20450 triggered the dangling pointer in the list stack.
The crash caused by fuzz20580 was fixed by updating md4c from upstream:
4b0fc030777cd541604f5ebaaad47a2b76d61ff9
Change-Id: I8e1eca23b281256a03aea0f55e9ae20f1bdd2a38
Reviewed-by: Robert Loehning <robert.loehning@qt.io>
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We use md4c for parsing markdown. It provides flags to control the
feature set that will be supported when parsing particular documents.
QTextMarkdownImporter::Feature is a fine-grained set of flags that
exactly match the md4c feature flags that we support in Qt so far.
QTextMarkdownImporter is a private exported class (new in 5.14).
We don't expect the corresponding flags in md4c to change in
incompatible ways in the future: the md4c authors have as much respect
for avoiding compatibility issues as we do, and likely will only add
features, not remove them.
We now enforce QTextMarkdownImporter::Features compatibility with
QTextDocument::MarkdownFeatures by setting them directly. We check
QTextMarkdownImporter::Features compatibility with md4c's #define'd
feature flags using static asserts, so that any hypothetical
incompatibility would be detected at compile time.
The enum conversion from QTextDocument::MarkdownFeatures to
QTextMarkdownImporter::Features is moved to a new QTextMarkdownImporter
constructor; thus the conversions from QTextDocument::MarkdownFeatures
to QTextMarkdownImporter::Features, and then to unsigned (in
QTextMarkdownImporter::import()) are adjacent in the same private class
implementation. If incompatibility ever occurred, we would need to
replace one or both of those with another suitable conversion function.
Change-Id: I0bf8a21eb7559df1d38406b948ef657f9060c67b
Reviewed-by: Vitaly Fanaskov <vitaly.fanaskov@qt.io>
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This came up during API review.
Change-Id: I9198e1eb96db0c21e46a226a032919bb62d3ca66
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
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MD4C now makes it possible to detect indented and fenced code blocks:
https://github.com/mity/md4c/issues/81
Fenced code blocks have the advantages of being easier to write by hand,
and having an "info string" following the opening fence, which is commonly
used to declare the language.
Also, the HTML parser now recognizes tags of the form
<pre class="language-foo">
which is one convention for declaring the programming language
(as opposed to human language, for which the lang attribute would be used):
https://stackoverflow.com/questions/5134242/semantics-standards-and-using-the-lang-attribute-for-source-code-in-markup
So it's possible to read HTML and write markdown without losing this information.
It's also possible to read markdown with any type of code block:
fenced with ``` or ~~~, or indented, and rewrite it the same way.
Change-Id: I33c2bf7d7b66c8f3ba5bdd41ab32572f09349c47
Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>
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It's a required CommonMark feature:
https://spec.commonmark.org/0.29/#images
and alt text is also required in HTML:
https://www.w3.org/wiki/Html/Elements/img#Requirements_for_providing_text_to_act_as_an_alternative_for_images
Now we are able to read these attributes from either html or markdown
and rewrite either an html or markdown document that preserves them.
This patch does not add viewing or editing support in QTextEdit etc.
Change-Id: I51307389f8f9fc00809808390e583a83111a7b33
Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>
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When reading a document like
# heading
- list item
and then re-writing it, it turned into
# heading
- # list item
because QTextCursor::insertList() simply calls QTextCursor::insertBlock(), thus
inheriting block format from the previous block, without an opportunity to
explicitly define the block format. So be more consistent: use
QTextMarkdownImporter::insertBlock() for blocks inside list items too. Now it
fully defines blockFormat first, then inserts the block, and then adds it to
the current list only when the "paragraph" is actually the list item's text
(but not when it's a continuation paragraph). Also, be prepared for applying
and removing block markers to arbitrary blocks, just in case (they might be
useful for block quotes, for example).
Change-Id: I391820af9b65e75abce12abab45d2477c49c86ac
Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>
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Change-Id: Id27fc81af8d2b0355b186540f41d75a9c8d7c7f3
Reviewed-by: David Faure <david.faure@kdab.com>
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Can now detect nested quotes and code blocks inside quotes, and can
rewrite the markdown too.
QTextHtmlParser sets hard-coded left and right margins, so we need to do
the same to be able to read HTML and write markdown, or vice-versa,
and to ensure that all views (QTextEdit, QTextBrowser, QML Text etc.)
will render it with margins. But now we add a semantic memory too:
BlockQuoteLevel is similar to HeadingLevel, which was added in
310daae53926628f80c08e4415b94b90ad525c8f to preserve H1..H6 heading
levels, because detecting it via font size didn't make sense in
QTextMarkdownWriter. Likewise detecting quote level by its margins
didn't make sense; markdown supports nesting quotes; and indenting
nested quotes via 40 pixels may be a bit too much, so we should consider
it subject to change (and perhaps be able to change it via CSS later on).
Since we're adding BlockQuoteLevel and depending on it in QTextMarkdownWriter,
it's necessary to set it in QTextHtmlParser to enable HTML->markdown
conversion. (But so far, nested blockquotes in HTML are not supported.)
Quotes (and nested quotes) can contain indented code blocks, but it seems
the reverse is not true (according to https://spec.commonmark.org/0.29/#example-201 )
Quotes can contain fenced code blocks.
Quotes can contain lists. Nested lists can be interrupted with
nested code blocks and nested quotes.
So far the writer assumes all code blocks are the indented type.
It will be necessary to add another attribute to remember whether the
code block is indented or fenced (assuming that's necessary).
Fenced code blocks would work better for writing inside block quotes
and list items because the fence is less ambiguous than the indent.
Postponing cursor->insertBlock() as long as possible helps with nesting.
cursor->insertBlock() needs to be done "just in time" before inserting
text that will go in the block. The block and char formats aren't
necessarily known until that time. When a nested block (such as a
nested quote) ends, the context reverts to the previous block format,
which then needs to be re-determined and set before we insert text
into the outer block; but if no text will be inserted, no new block
is necessary. But we can't use QTextBlockFormat itself as storage,
because for some reason bullets become very "sticky" and it becomes
impossible to have plain continuation paragraphs inside list items:
they all get bullets. Somehow QTextBlockFormat remembers, if we copy it.
But we can create a new one each time and it's OK.
Change-Id: Icd0529eb90d2b6a3cb57f0104bf78a7be81ede52
Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>
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Importer fixes:
- the first list item after a heading doesn't keep the heading font
- the first text fragment after a bullet is the bullet text, not a
separate paragraph
- detect continuation lines and append to the list item text
- detect continuation paragraphs and indent them properly
- indent nested list items properly
- add a test for QTextMarkdownImporter
Writer fixes:
- after bullet items, continuation lines and paragraphs are indented
- indentation of continuations isn't affected by checkboxes
- add extra newlines between list items in "loose" lists
- avoid writing triple newlines
- enhance the test for QTextMarkdownWriter
Change-Id: Ib1dda514832f6dc0cdad177aa9a423a7038ac8c6
Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>
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It's a private header; but to be able to use it in a test, it has to
be as clean as a public header.
Change-Id: I868372406e62acc24051a6523fee89bb911a61f9
Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>
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This provides the ability to read from a Markdown string or file into
a QTextDocument, such that the formatting will be recognized and can be
rendered.
- Add QTextDocument::setMarkdown(QString)
- Add QTextEdit::setMarkdown(QString)
- Add TextFormat::MarkdownText
- QWidgetTextControl::setContent() calls QTextDocument::setMarkdown()
if that's the format
Fixes: QTBUG-72349
Change-Id: Ief2ad71bf840666c64145d58e9ca71d05fad5659
Reviewed-by: Lisandro Damián Nicanor Pérez Meyer <perezmeyer@gmail.com>
Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>
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