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// @flow
// smash, with optional [tb], as in AMS
import defineFunction from "../defineFunction";
import buildCommon from "../buildCommon";
import mathMLTree from "../mathMLTree";
import {assertNodeType} from "../parseNode";
import * as html from "../buildHTML";
import * as mml from "../buildMathML";
defineFunction({
type: "smash",
names: ["\\smash"],
props: {
numArgs: 1,
numOptionalArgs: 1,
allowedInText: true,
},
handler: ({parser}, args, optArgs) => {
let smashHeight = false;
let smashDepth = false;
const tbArg = optArgs[0] && assertNodeType(optArgs[0], "ordgroup");
if (tbArg) {
// Optional [tb] argument is engaged.
// ref: amsmath: \renewcommand{\smash}[1][tb]{%
// def\mb@t{\ht}\def\mb@b{\dp}\def\mb@tb{\ht\z@\z@\dp}%
let letter = "";
for (let i = 0; i < tbArg.body.length; ++i) {
const node = tbArg.body[i];
// $FlowFixMe: Not every node type has a `text` property.
letter = node.text;
if (letter === "t") {
smashHeight = true;
} else if (letter === "b") {
smashDepth = true;
} else {
smashHeight = false;
smashDepth = false;
break;
}
}
} else {
smashHeight = true;
smashDepth = true;
}
const body = args[0];
return {
type: "smash",
mode: parser.mode,
body,
smashHeight,
smashDepth,
};
},
htmlBuilder: (group, options) => {
const node = buildCommon.makeSpan(
[], [html.buildGroup(group.body, options)]);
if (!group.smashHeight && !group.smashDepth) {
return node;
}
if (group.smashHeight) {
node.height = 0;
// In order to influence makeVList, we have to reset the children.
if (node.children) {
for (let i = 0; i < node.children.length; i++) {
node.children[i].height = 0;
}
}
}
if (group.smashDepth) {
node.depth = 0;
if (node.children) {
for (let i = 0; i < node.children.length; i++) {
node.children[i].depth = 0;
}
}
}
// At this point, we've reset the TeX-like height and depth values.
// But the span still has an HTML line height.
// makeVList applies "display: table-cell", which prevents the browser
// from acting on that line height. So we'll call makeVList now.
const smashedNode = buildCommon.makeVList({
positionType: "firstBaseline",
children: [{type: "elem", elem: node}],
}, options);
// For spacing, TeX treats \hphantom as a math group (same spacing as ord).
return buildCommon.makeSpan(["mord"], [smashedNode], options);
},
mathmlBuilder: (group, options) => {
const node = new mathMLTree.MathNode(
"mpadded", [mml.buildGroup(group.body, options)]);
if (group.smashHeight) {
node.setAttribute("height", "0px");
}
if (group.smashDepth) {
node.setAttribute("depth", "0px");
}
return node;
},
});
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