59 lines
1.8 KiB
TypeScript
59 lines
1.8 KiB
TypeScript
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import defineFunction from "../defineFunction";
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import {makeLineSpan, makeSpan, makeVList} from "../buildCommon";
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import {MathNode, TextNode} from "../mathMLTree";
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import * as html from "../buildHTML";
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import * as mml from "../buildMathML";
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defineFunction({
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type: "overline",
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names: ["\\overline"],
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props: {
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numArgs: 1,
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},
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handler({parser}, args) {
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const body = args[0];
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return {
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type: "overline",
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mode: parser.mode,
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body,
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};
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},
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htmlBuilder(group, options) {
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// Overlines are handled in the TeXbook pg 443, Rule 9.
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// Build the inner group in the cramped style.
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const innerGroup = html.buildGroup(group.body,
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options.havingCrampedStyle());
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// Create the line above the body
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const line = makeLineSpan("overline-line", options);
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// Generate the vlist, with the appropriate kerns
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const defaultRuleThickness = options.fontMetrics().defaultRuleThickness;
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const vlist = makeVList({
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positionType: "firstBaseline",
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children: [
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{type: "elem", elem: innerGroup},
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{type: "kern", size: 3 * defaultRuleThickness},
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{type: "elem", elem: line},
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{type: "kern", size: defaultRuleThickness},
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],
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}, options);
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return makeSpan(["mord", "overline"], [vlist], options);
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},
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mathmlBuilder(group, options) {
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const operator = new MathNode(
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"mo", [new TextNode("\u203e")]);
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operator.setAttribute("stretchy", "true");
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const node = new MathNode(
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"mover",
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[mml.buildGroup(group.body, options), operator]);
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node.setAttribute("accent", "true");
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return node;
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},
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});
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