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this.expect("}"),this.nextToken=t,r}parseExpression(e,t){for(var r=[];;){"math"===this.mode&&this.consumeSpaces();var a=this.fetch();if(-1!==aP.endOfExpression.indexOf(a.text)||t&&a.text===t||e&&tv[a.text]&&tv[a.text].infix)break;var n=this.parseAtom(t);if(n){if("internal"===n.type)continue}else break;r.push(n)}return"text"===this.mode&&this.formLigatures(r),this.handleInfixNodes(r)}handleInfixNodes(e){for(var t=-1,r=0;r<e.length;r++)if("infix"===e[r].type){if(-1!==t)throw new B("only one infix operator per group",e[r].token);t=r,a=e[r].replaceWith}if(-1===t||!a)return e;var a,n,i,s,o=e.slice(0,t),l=e.slice(t+1);return n=1===o.length&&"ordgroup"===o[0].type?o[0]:{type:"ordgroup",mode:this.mode,body:o},i=1===l.length&&"ordgroup"===l[0].type?l[0]:{type:"ordgroup",mode:this.mode,body:l},[s="\\\\abovefrac"===a?this.callFunction(a,[n,e[t],i],[]):this.callFunction(a,[n,i],[])]}handleSupSubscript(e){var t=this.fetch(),r=t.text;this.consume(),this.consumeSpaces();var a=this.parseGroup(e);if(!a)throw new B("Expected group after '"+r+"'",t);return a}formatUnsupportedCmd(e){for(var t=[],r=0;r<e.length;r++)t.push({type:"textord",mode:"text",text:e[r]});var a={type:"text",mode:this.mode,body:t};return{type:"color",mode:this.mode,color:this.settings.errorColor,body:[a]}}parseAtom(e){var t,r,a=this.parseGroup("atom",e);if("text"===this.mode)return a;for(;;){this.consumeSpaces();var n=this.fetch();if("\\limits"===n.text||"\\nolimits"===n.text){if(a&&"op"===a.type){var i="\\limits"===n.text;a.limits=i,a.alwaysHandleSupSub=!0}else if(a&&"operatorname"===a.type)a.alwaysHandleSupSub&&(a.limits="\\limits"===n.text);else throw new B("Limit controls must follow a math operator",n);this.consume()}else if("^"===n.text){if(t)throw new B("Double superscript",n);t=this.handleSupSubscript("superscript")}else if("_"===n.text){if(r)throw new B("Double subscript",n);r=this.handleSupSubscript("subscript")}else if("'"===n.text){if(t)throw new B("Double superscript",n);var s={type:"textord",mode:this.mode,text:"\\prime"},o=[s];for(this.consume();"'"===this.fetch().text;)o.push(s),this.consume();"^"===this.fetch().text&&o.push(this.handleSupSubscript("superscript")),t={type:"ordgroup",mode:this.mode,body:o}}else if(aL[n.text]){var l=aE.test(n.text),h=[];for(h.push(new T(aL[n.text])),this.consume();;){var m=this.fetch().text;if(!aL[m]||aE.test(m)!==l)break;h.unshift(new T(aL[m])),this.consume()}var c=this.subparse(h);l?r={type:"ordgroup",mode:"math",body:c}:t={type:"ordgroup",mode:"math",body:c}}else break}return t||r?{type:"supsub",mode:this.mode,base:a,sup:t,sub:r}:a}parseFunction(e,t){var r=this.fetch(),a=r.text,n=tv[a];if(!n)return null;if(this.consume(),t&&"atom"!==t&&!n.allowedInArgument)throw new B("Got function '"+a+"' with no arguments"+(t?" as "+t:""),r);if("text"!==this.mode||n.allowedInText){if("math"===this.mode&&!1===n.allowedInMath)throw new B("Can't use function '"+a+"' in math mode",r)}else throw new B("Can't use function '"+a+"' in text 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