strict-content-mathml-editor

v1.0.3

Published

3 years ago

WYSIWYG editor for MathML expressions

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akrinke

mathml mathml3 math xml equation formula editor

Strict Content MathML Editor

This editor helps to create Strict Content MathML 3.0 expressions.

Demo

Visit https://ifte-eda.github.io/strict-content-mathml-editor/ for a simple demo page that displays the generated Strict Content MathML code.

Screenshot

$Screenshot of the Strict Content MathML Editor$

Features

Support of custom symbols, e.g. type Umax and get the single symbol Umax instead of the product Umax in the formula editor
Support of SI prefixes and units
Support of piecewise-defined expressions
Automatic detection of integers, real numbers and rational numbers

Installation

npm install strict-content-mathml-editor

Usage

The editor component is provided by Guppy which is licensed under the MIT License.

This package provides the function guppy_xml_to_mathml to convert Guppy's internal XML format to Strict Content MathML.

For a simple demo web page with the formula editor and a text field displaying the resulting MathML code, the following files index.html and mathml-editor.js are required.

`index.html`

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <link rel="stylesheet" href="node_modules/guppy-js/guppy-default-osk.min.css">
    <script type="text/javascript" src="node_modules/guppy-js/guppy.min.js"></script>
    <script type="text/javascript" src="node_modules/guppy-js/guppy_osk.js"></script>
    <script type="text/javascript" src="https://cdn.jsdelivr.net/gh/vkiryukhin/vkBeautify@master/vkbeautify.js"></script>
    <script type="text/javascript" src="node_modules/strict-content-mathml-editor/guppy-xml-to-mathml.js"></script>
    <script type="text/javascript" src="mathml-editor.js"></script>
</head>

<body>
    <h2>Editor</h2>
    <div id="guppy1"></div>

    <h2>Result</h2>
    <div class="label">Strict Content MathML3: </div>
    <textarea type="text" id="output_mathml" class="output" rows="30" cols="100"></textarea>
</body>
</html>

`mathml_editor.js`

window.onload = function(){
    // ID of the editor's div
    var editor_id = "guppy1";
    // output textarea
    var output_mathml = document.getElementById("output_mathml");

    // update output textarea when editor content changes
    var update_output = function(e) {
        try {
            var engine = e.target.engine;
            var doc = engine.doc;
            var content = (new XMLSerializer()).serializeToString(guppy_xml_to_mathml(engine, doc));
            content = vkbeautify.xml(content, 4);
            output_mathml.value = content;
        }
        catch(e) {
            output_mathml.value = "Failed to parse input: " + e.message;
        }
    }

    // tab completion after backslash prints all candidates in the output textarea
    var completion = function(e) {
        output_mathml.value = e.candidates.join(", ");
    }

    Guppy.init({
        "osk":new GuppyOSK(),
        "path":"node_modules/guppy-js",
        "symbols":["node_modules/guppy-js/sym/symbols.json","node_modules/strict-content-mathml-editor/strict-content-mathml-symbols.json"],
        "events": {
            "ready": update_output,
            "change": update_output,
            "completion": completion
        },
        "settings":{
            "empty_content": "{\\text{Click to start typing math!}}"
        },
    });

    var g1 = new Guppy(editor_id);
}

Custom Symbols

You can define custom mathematical/physical symbols for later use in the formula.

Example: By defining a custom symbol, you can type Umax in the formula editor and get the single symbol Umax instead of the product Umax. In this case, the resulting MathML is <ci>Umax</ci>.

Guppy.add_global_symbol("Umax", {
    "output": {
        "latex": "U_\\text{max}",
        "asciimath": "Umax"
    },
    "attrs": {
        "group": "custom",
        "type": "Umax"
    }
});

Supported Content Dictionaries

In Strict Content MathML3, all mathematical concepts are grouped in content dictionaries. Currently, this formula editor supports the following content dictionaries and concepts:

arith1

abs
divide
minus
plus
power
product
root
sum
times
unary_minus

calculus1

defint
diff
int

directives1

evaluate

integer1

factorial

linalg2

matrix
matrixrow
vector

logic1

and
false
nand
nor
not
or
true
xnor
xor

norm1

Euclidean_norm

nums1

infinity

piece1

piece
piecewise
otherwise

prog1

assignment
block
call_arguments
def_arguments
for
global_var
if
function_block
function_call
function_definition
local_var
procedure_block
procedure_call
procedure_definition
return
while

relation1

rounding1

ceiling
floor

transc1

arccos
arcsin
arctan
cos
cosh
cot
csc
ln
log
sec
sin
sinh
tan
tanh

units_siprefix1

yocto
zepto
atto
femto
pico
nano
micro
milli
centi
deci
deka
hecto
kilo
mega
giga
tera
peta
exa
zetta
yotta

units_time1

calendar_month
calendar_year

SI_BaseUnits1

ampere
candela
kelvin
kilogram
metre
mole
second

SI_NamedDerivedUnits1

becquerel
coulomb
degree celsius
farad
gram
gray
henry
hertz
joule
katal
lumen
lux
newton
ohm
pascal
radian
siemens
sievert
steradian
tesla
volt
watt
weber

SIUsed_OffSystemUnits1

bel
day
hour
litre
minute
neper
tonne
degree of arc
minute of arc
second of arc