afb29f5df3
Reviewers: xymostech Reviewed By: xymostech Differential Revision: http://phabricator.benalpert.com/D37
110 lines
3.1 KiB
JavaScript
110 lines
3.1 KiB
JavaScript
var parser = require("./parser");
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var buildExpression = function(expression) {
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return _.map(expression, function(ex, i) {
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var prev = i > 0 ? expression[i-1] : null;
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return buildGroup(ex, prev);
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});
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};
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var makeSpan = function(className, children) {
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var span = document.createElement("span");
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span.className = className;
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if (_.isArray(children)) {
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_.each(children, function(v) {
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span.appendChild(v);
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});
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} else if (children) {
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span.appendChild(children);
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}
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return span;
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};
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var buildGroup = function(group, prev) {
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if (group.type === "ord") {
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return makeSpan("mord", mathit(group.value));
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} else if (group.type === "bin") {
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var className = "mbin";
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if (prev == null || prev.type === "bin" || prev.type === "open") {
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group.type = "ord";
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className = "mord";
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}
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return makeSpan(className, textit(group.value));
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} else if (group.type === "sup") {
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var sup = makeSpan("msup", buildExpression(group.value.sup));
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return makeSpan("mord", buildExpression(group.value.base).concat(sup));
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} else if (group.type === "sub") {
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var sub = makeSpan("msub", buildExpression(group.value.sub, sub));
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return makeSpan("mord", buildExpression(group.value.base, elem).concat(sub));
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} else if (group.type === "supsub") {
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var sup = makeSpan("msup", buildExpression(group.value.sup, sup));
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var sub = makeSpan("msub", buildExpression(group.value.sub, sub));
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var supsub = makeSpan("msupsub", [sup, sub]);
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return makeSpan("mord", buildExpression(group.value.base, elem).concat(supsub));
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} else if (group.type === "open") {
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return makeSpan("mopen", textit(group.value));
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} else if (group.type === "close") {
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return makeSpan("mclose", textit(group.value));
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} else if (group.type === "frac") {
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var numer = makeSpan("mfracnum", buildExpression(group.value.numer, numer));
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var mid = makeSpan("mfracmid", makeSpan());
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var denom = makeSpan("mfracden", buildExpression(group.value.denom, denom));
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return makeSpan("mord mfrac", [numer, mid, denom]);
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} else {
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console.log("Unknown type:", group.type);
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}
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};
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var charLookup = {
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"*": "\u2217",
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"-": "\u2212",
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"cdot": "\u22C5",
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"lvert": "|",
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"rvert": "|",
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"pm": "\u00b1",
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"div": "\u00f7"
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};
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var textit = function(value) {
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if (value in charLookup) {
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value = charLookup[value];
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}
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return document.createTextNode(value);
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};
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var mathit = function(value) {
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var text = textit(value);
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if (/[a-zA-Z]/.test(value)) {
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return makeSpan("mathit", text);
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} else {
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return text;
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}
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};
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var clearNode = function(node) {
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if ("textContent" in node) {
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node.textContent = "";
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} else {
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node.innerText = "";
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}
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};
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var process = function(toParse, baseElem) {
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var tree = parser.parse(toParse);
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clearNode(baseElem);
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_.each(buildExpression(tree), function(elem) {
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baseElem.appendChild(elem);
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});
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};
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module.exports = {
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process: process
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};
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