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