Summary:
Follow the TeXbook instructions on how to construct square roots. Using
makeCustomSizedDelim, this becomes nearly trivial.
Test Plan:
- Make sure normal tests work
- Make sure the new huxley test looks good, and other huxley tests haven't changed.
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D12918
Summary:
Added stacked delimiter support for more delimiters. Split out delimiter
functions into its own file, and split out some tree building functions into a
common file. Supports the empty `.` delimiter with \left and \right, and doesn't
try to produce huge /, \backslash, <, or > delimiters. Depends on D7844
Test input:
\left( \left) \left[ \left\lbrack \left] \left\rbrack \left\{ \left\lbrace
\left\} \left\rbrace \left\lfloor \left\rfloor \left\lceil \left\rceil
\left\langle \left\rangle \left/ \left\backslash \left| \left\vert \left\|
\left\Vert \left\uparrow \left\Uparrow \left\downarrow \left\Downarrow
\left\updownarrow \left\Updownarrow {x^{x^{x^{x^{x^{x^{x^{x^{x^{x^x}}}}}}}}}}
\right.\right.\right.\right.\right.\right.\right.\right.\right.\right.
\right.\right.\right.\right.\right.\right.\right.\right.\right.\right.
\right.\right.\right.\right.\right.\right.\right.\right.
Test Plan:
- Run the test input, see that it works
- Run the tests, see that they work
- Look at huxley screenshots (not here yet :( ) and make sure they look good
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D11602
Summary:
I don't know why we originally used 2/3em for scriptstyle, but both TeX
and MathJax use 0.7em for the scriptstyle size.
Test Plan:
- Look at huxley tests, make sure everything that changed is due to the change
in font size
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D12869
Summary:
Instead of using the metrics from our generated TTF files, use the fonts that
TeX ships with. Pull the mapping out of the MathJax-dev repo from makeFF to get
the correct mapping of metrics to font characters, and use our own tfm reader to
extract metrics out of the tfm files into a useable format. Add a README and
Makefile rule to make this process easier in the future.
Also remove the silly 0.05em we put on supsubs because our italic correction
works now.
Test Plan:
- Run huxley tests, see that changes are because of font metric changes.
- See that the extension piece of `\bigl |` now extends above the top, as it is
supposed to.
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D12867
Summary:
Supports the 'ex' and 'em' units for sizes. Doesn't support the optional depth
argument.
Test Plan:
- See that the huxley test looks good, and nothing else changed
- See that the tests pass
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D12777
Summary:
In LaTeX, large delimiters are the same font size as they are at a normal size,
regardless of the actual size. This means that we need to scale up the font size
in the inner nodes, which is annoying because we run into the same problem we
had with \Huge, etc in those nodes. Thus, this fixes both problems at once.
The problem was that when we used our baseline-align-hack and then increased the
font size inside of one of the middle (display: block and height: 0) nodes, the
node with the increased font size would shift downards (misaligning its
baseline). To fix this, we add a method for calculating the maximum font size
used in each of the nodes, and adding a small node with this font size to each
of the other nodes (including the fix-ie node). This shifts all of the nodes
down the same amount, and gets their baselines aligned.
Test Plan:
- Do dumb things by putting \Huge and \big in places they shouldn't be, and
make sure they behave responsibly
- Do the same thing in IE 8, 9, 10, 11, Safari, Firefox, and make sure they all
behave the same (to some approximation)
- Make sure the new huxley image looks good, and the images that changed don't
have significant changes
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D12684
Summary:
Also, rename all of our uses of fonts to use the uppercased versions. We want to
use the uppercase versions because it makes updating and modifying the fonts
much easier (since the font names inside the actual font files are uppercased).
Test Plan:
- Make sure the huxley screenshots look good (You can compare a diff of them
on github at
f90d093361
By my eye, it seems like some things have moved up ~1/2 pixel, and some of
the fonts have maybe slightly changed shape, like the large `b` in
SizingBaseline)
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D11979
Summary:
Follow the instructions in the TeX book for drawing \overlines. This uses the
same code as fractions to produce the bars. Also added the ability to cramp
styles (i.e. T -> T' and T' -> T').
Test Plan:
- Look at `\overline{x}`, `\overline{\dfrac{x}{y}+z}`, and
`\blue{\overline{x}}` to make sure they look good.
- Make sure the tests work
- Make sure the huxley tests look good (Not here yet :( )
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D11604
Match the naming styles used for the css styles in the variable names.
Test Plan:
- Make sure `x\Huge x \tiny x \Huge x` renders correctly.
- Make sure the huxley tests stay the same
Auditors: alpert
Summary:
Make delimiter sizing work. This involved
- Adding the symbols for the remaining delimiters (like `\lfloor` and `\{`)
- Adding metrics for the size1, size2, size3, and size4 fonts
- Parsing delimiter sizing functions
- Using the big fonts when possible, otherwise building large copies of the
delimiters from scratch
Test Plan:
- See that
`\bigl\uparrow\Bigl\downarrow\biggl\updownarrow\Biggl\Uparrow
\Biggr\Downarrow\biggr\Updownarrow\bigm/\Bigm\backslash\biggm|
\Biggm|\big\lceil\Big\rceil\bigg\langle\Bigg\rangle\bigl(\Bigl)
\biggl[\Biggl]\Biggr\{\biggr\}\Bigr\lfloor\bigr\rfloor`
parses correctly (this contains all of the delimiters, and all of the sizing
modes)
- See that the huxley tests didn't change, and the new one looks good
- See the normal tests work
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D7844
Summary:
Implicit groups are objects that act like groups but don't have brackets around
them. This is used for things like sizing functions or font-change functions
that can occur in the middle of the group, but act like they apply to a group
after them which stops when the current group stops. E.g. `Hello {world \Large
hello} world` produces normal, normal, Large, normal text. (Note, I just came up
with the name implicit group, I don't think this is actually how it is parsed in
LaTeX but it fits nicely with the current parsing scheme and seems to work
well).
For now, apply this to the sizing functions (we don't have any other functions
that act like this). Also note that this doesn't really do much practically
because we limit sizing functions to only be on the top level of the expression,
but it does let people do `\Large x` and get a large `x`, without having to add
braces.
Test Plan:
- Run the tests, see they work
- Make sure `abc \Large abc` looks correct
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D10876
Summary:
For some reason, `vertical-align: top` doesn't work in IE9, or at least doesn't
work the same as in any other browser (I'm too lazy to figure out what the
correct behavior really should be). Giving a literal value for `vertical-align`
works the same in all browsers, so use that instead.
Test Plan:
- Replace line 13 of static/index.html with
<br>m<span id="math"></span>m
- See that the test page now looks good in Chrome, Firefox, and IE9
- See that huxley tests haven't changed
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D8384
For some reason, when you have a nested elements that look like
`display: inline-block; > position: relative; > position: absolute;`
then the `position: absolute;` element is shifted down a bunch. If there is
anything* else inside either of the other two elements, then this behavior
disappears. (This can be seen at [this fiddle](http://jsfiddle.net/qZXRr/). We
have this structure when we create `\llap` and `\rlap`s, and this weird behavior
So, to fix this I added an empty `display: inline-block;` span inside the llap
to fix this.
Test plan:
- See that the new huxley image looks good
- Test this in a bunch of browsers and see they also look good
Auditors: alpert
Summary:
Keep track of the color inside the style now, and use that when we are
rendering things. Added a custom lexing mode to handle lexing colors correctly.
Prefixed the old katex colors (internally) with "katex-" to distinguish them
from CSS colors.
Test Plan:
- Run the normal tests, see they work
- Run the huxley tests, see that they didn't change except for the color one
which looks right
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D7763
Summary:
Remove a single `vertical-align: top`, and somewhow it now works. May
the gods of CSS have mercy on us. Also added some tests.
Test Plan:
- See that the huxley tests don't have any changes
- See that the new huxley screenshots look reasonable
- Run the normal tests and see that they work
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D7494
Summary:
TeX spacing is complicated - there's \enskip and \enspace and the two are
subtly different in some weird way. But \enspace seems to be the preferred
half em space in LaTeX, and the only one which MathJax supports.
Test Plan: Parsed and rendered correctly.
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D6437
Test Plan: Parses and renders locally. \!\, and \,\! are now no-ops.
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D6395
Summary:
Right now, when the size gets bigger, this still doesn't work, so there's a
check to prevent that. However, functions that go smaller (like `\small`,
`\tiny`, etc) do work. Also, we can't seem to use the sizing functions inside
of fractions (so something like `\dfrac{\small\frac{x}{y}}{z}` doesn't work).
However, the most prominent use case is `\small` as the outer-most object, so
this is still helpful. This commit has the parsing and stuff to handle all of
it, but it'll throw an error if you try to do something that doesn't work. (For
the record, "doesn't work" means "looks bad", not "throws an unexpected
error").
Test Plan:
Make sure things like `\small x` work, and things like `\Huge x` and
`\frac{\small x}{y}` don't.
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D3619
Summary:
\nleq and \ngeq are AMS characters, so add support for parsing and
showing those. Also, add font metrics from the ams_regular font.
Test Plan:
View `\ngeq \geq`, make sure that they look the same but with a
slash through `\ngeq`. View `a \ngeq b`, make sure there's the right spacing
for a rel.
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D3547
Summary:
This diff does a couple different things:
- There is now a metrics/ folder, which contains the property files describing
the metrics if the fonts, as well as a script for reading and printing the
metrics in javascript.
- Fractions and superscripts/subscripts are now rendered in slightly different
ways now (notably, no use of inline-table). This allows for much more precise
positioning of the superscripts, subscripts, numerators, and denominators,
while still having an appropriate baseline. Also, there is no longer a
sup/sub/supsub distinction, there are only supsubs with null sup/sub.
- Using the new font metrics and by implementing the formulas found in The TeX
Book, Appendix G, the heights and depths of all of the sub-expressions in a
formula are now calculated. These are currently used to:
- Correctly position superscripts, subscripts, numerators, and denominators
- Adjust the height and depth of the overall expression so it takes up the
appropriate space
- Because we have to add attributes (height and depth) to every attribute, I
have changed the way DOM nodes are assembled. Now, instead of assembling the
DOM elements inline (which is a problem because we need to track
height/depth, and we shouldn't (and can't in IE 8) attach raw attributes to DOM
nodes), we assemble a pseudo-DOM structure with the extra information, and
then actually assemble it at the very end.
The main page also now has an updated expression to show off and test the new
and improved parsing.
Test Plan:
View the main page, make sure that the expression renders. Make sure
that the tests pass. Make sure that expressions have the correct calculated
height (this is most easily tested by viewing them on the main page and making
sure that the top of the expression lines up with the bottom of the input box).
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D3442
