d2fa50c836
Summary: Move MJLite into its own file, make a module. Now includes underscore. Test Plan: Make sure it still parses stuff. Reviewers: spicyj Reviewed By: spicyj CC: divad12 Differential Revision: http://phabricator.benalpert.com/D32
109 lines
3.5 KiB
JavaScript
109 lines
3.5 KiB
JavaScript
var MJLite = (function() {
|
|
|
|
var buildExpression = function(expression) {
|
|
return _.map(expression, function(ex, i) {
|
|
var prev = i > 0 ? expression[i-1] : null;
|
|
|
|
return buildGroup(ex, prev);
|
|
});
|
|
};
|
|
|
|
var makeSpan = function(className, children) {
|
|
var span = document.createElement("span");
|
|
span.className = className;
|
|
|
|
if (_.isArray(children)) {
|
|
_.each(children, function(v) {
|
|
span.appendChild(v);
|
|
});
|
|
} else if (children) {
|
|
span.appendChild(children);
|
|
}
|
|
|
|
return span;
|
|
};
|
|
|
|
var buildGroup = function(group, prev) {
|
|
if (group.type === "ord") {
|
|
return makeSpan("mord", mathit(group.value));
|
|
} else if (group.type === "bin") {
|
|
var className = "mbin";
|
|
if (prev == null || prev.type === "bin" || prev.type === "open") {
|
|
group.type = "ord";
|
|
elem.className = "mord";
|
|
}
|
|
return makeSpan(className, mathit(group.value));
|
|
} else if (group.type === "sup") {
|
|
var sup = makeSpan("msup", buildExpression(group.value.sup));
|
|
return makeSpan("mord", buildExpression(group.value.base).concat(sup));
|
|
} else if (group.type === "sub") {
|
|
var sub = makeSpan("msub", buildExpression(group.value.sub, sub));
|
|
return makeSpan("mord", buildExpression(group.value.base, elem).concat(sub));
|
|
} else if (group.type === "supsub") {
|
|
var sup = makeSpan("msup", buildExpression(group.value.sup, sup));
|
|
var sub = makeSpan("msub", buildExpression(group.value.sub, sub));
|
|
|
|
var supsub = makeSpan("msupsub", [sup, sub]);
|
|
|
|
return makeSpan("mord", buildExpression(group.value.base, elem).concat(supsub));
|
|
} else if (group.type === "open") {
|
|
return makeSpan("mopen", mathit(group.value));
|
|
} else if (group.type === "close") {
|
|
return makeSpan("mclose", mathit(group.value));
|
|
} else if (group.type === "cdot") {
|
|
return makeSpan("mbin", textit("cdot"));
|
|
} else if (group.type === "frac") {
|
|
var numer = makeSpan("mfracnum", buildExpression(group.value.numer, numer));
|
|
var mid = makeSpan("mfracmid", makeSpan());
|
|
var denom = makeSpan("mfracden", buildExpression(group.value.denom, denom));
|
|
|
|
return makeSpan("mord mfrac", [numer, mid, denom]);
|
|
} else {
|
|
console.log("Unknown type:", group.type);
|
|
}
|
|
};
|
|
|
|
var charLookup = {
|
|
'*': '\u2217',
|
|
'-': '\u2212',
|
|
'cdot': '\u22C5'
|
|
};
|
|
|
|
var textit = function(value) {
|
|
if (value in charLookup) {
|
|
value = charLookup[value];
|
|
}
|
|
return document.createTextNode(value);
|
|
};
|
|
|
|
var mathit = function(value) {
|
|
var text = textit(value);
|
|
|
|
if (/[a-zA-Z]/.test(value)) {
|
|
return makeSpan("mathit", text);
|
|
} else {
|
|
return text;
|
|
}
|
|
};
|
|
|
|
var clearNode = function(node) {
|
|
var children = node.childNodes;
|
|
for (var i = children.length - 1; i >= 0; i--) {
|
|
node.removeChild(children[i]);
|
|
}
|
|
};
|
|
|
|
var process = function(toParse, baseElem) {
|
|
var tree = parser.parse(toParse);
|
|
clearNode(baseElem);
|
|
_.each(buildExpression(tree), function(elem) {
|
|
baseElem.appendChild(elem);
|
|
});
|
|
};
|
|
|
|
return {
|
|
process: process
|
|
};
|
|
|
|
})();
|