45 lines
1.4 KiB
JavaScript
45 lines
1.4 KiB
JavaScript
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// @flow
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import defineFunction from "../defineFunction";
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import buildCommon from "../buildCommon";
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import mathMLTree from "../mathMLTree";
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import * as html from "../buildHTML";
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import * as mml from "../buildMathML";
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// \vcenter: Vertically center the argument group on the math axis.
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defineFunction({
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type: "vcenter",
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names: ["\\vcenter"],
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props: {
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numArgs: 1,
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argTypes: ["original"], // In LaTeX, \vcenter can act only on a box.
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allowedInText: false,
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},
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handler({parser}, args) {
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return {
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type: "vcenter",
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mode: parser.mode,
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body: args[0],
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};
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},
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htmlBuilder(group, options) {
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const body = html.buildGroup(group.body, options);
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const axisHeight = options.fontMetrics().axisHeight;
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const dy = 0.5 * ((body.height - axisHeight) - (body.depth + axisHeight));
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return buildCommon.makeVList({
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positionType: "shift",
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positionData: dy,
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children: [{type: "elem", elem: body}],
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}, options);
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},
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mathmlBuilder(group, options) {
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// There is no way to do this in MathML.
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// Write a class as a breadcrumb in case some post-processor wants
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// to perform a vcenter adjustment.
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return new mathMLTree.MathNode(
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"mpadded", [mml.buildGroup(group.body, options)], ["vcenter"]);
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},
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});
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