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// @flow
import defineFunction from "../defineFunction";
import mathMLTree from "../mathMLTree";
import Style from "../Style";
import {sizingGroup} from "./sizing";
import * as mml from "../buildMathML";
const styleMap = {
"display": Style.DISPLAY,
"text": Style.TEXT,
"script": Style.SCRIPT,
"scriptscript": Style.SCRIPTSCRIPT,
};
defineFunction({
type: "styling",
names: [
"\\displaystyle", "\\textstyle", "\\scriptstyle",
"\\scriptscriptstyle",
],
props: {
numArgs: 0,
allowedInText: true,
primitive: true,
},
handler({breakOnTokenText, funcName, parser}, args) {
// parse out the implicit body
const body = parser.parseExpression(true, breakOnTokenText);
// TODO: Refactor to avoid duplicating styleMap in multiple places (e.g.
// here and in buildHTML and de-dupe the enumeration of all the styles).
// $FlowFixMe: The names above exactly match the styles.
const style: StyleStr = funcName.slice(1, funcName.length - 5);
return {
type: "styling",
mode: parser.mode,
// Figure out what style to use by pulling out the style from
// the function name
style,
body,
};
},
htmlBuilder(group, options) {
// Style changes are handled in the TeXbook on pg. 442, Rule 3.
const newStyle = styleMap[group.style];
const newOptions = options.havingStyle(newStyle).withFont('');
return sizingGroup(group.body, newOptions, options);
},
mathmlBuilder(group, options) {
// Figure out what style we're changing to.
const newStyle = styleMap[group.style];
const newOptions = options.havingStyle(newStyle);
const inner = mml.buildExpression(group.body, newOptions);
const node = new mathMLTree.MathNode("mstyle", inner);
const styleAttributes = {
"display": ["0", "true"],
"text": ["0", "false"],
"script": ["1", "false"],
"scriptscript": ["2", "false"],
};
const attr = styleAttributes[group.style];
node.setAttribute("scriptlevel", attr[0]);
node.setAttribute("displaystyle", attr[1]);
return node;
},
});
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