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r=t.text.replace(/\\([#$%&~_^{}])/g,"$1");return{type:"url",mode:this.mode,url:r}},t.parseArgumentGroup=function(e,t){var r=this.gullet.scanArgument(e);if(null==r)return null;var n=this.mode;t&&this.switchMode(t),this.gullet.beginGroup();var a=this.parseExpression(!1,"EOF");this.expect("EOF"),this.gullet.endGroup();var i={type:"ordgroup",mode:this.mode,loc:r.loc,body:a};return t&&this.switchMode(n),i},t.parseGroup=function(e,t){var r,a=this.fetch(),i=a.text;if("{"===i||"\\begingroup"===i){this.consume();var o="{"===i?"}":"\\endgroup";this.gullet.beginGroup();var s=this.parseExpression(!1,o),l=this.fetch();this.expect(o),this.gullet.endGroup(),r={type:"ordgroup",mode:this.mode,loc:Lr.range(a,l),body:s,semisimple:"\\begingroup"===i||void 0}}else if(null==(r=this.parseFunction(t,e)||this.parseSymbol())&&"\\"===i[0]&&!Vn.hasOwnProperty(i)){if(this.settings.throwOnError)throw new n("Undefined control sequence: "+i,a);r=this.formatUnsupportedCmd(i),this.consume()}return r},t.formLigatures=function(e){for(var t=e.length-1,r=0;r<t;++r){var n=e[r],a=n.text;"-"===a&&"-"===e[r+1].text&&(r+1<t&&"-"===e[r+2].text?(e.splice(r,3,{type:"textord",mode:"text",loc:Lr.range(n,e[r+2]),text:"---"}),t-=2):(e.splice(r,2,{type:"textord",mode:"text",loc:Lr.range(n,e[r+1]),text:"--"}),t-=1)),"'"!==a&&"`"!==a||e[r+1].text!==a||(e.splice(r,2,{type:"textord",mode:"text",loc:Lr.range(n,e[r+1]),text:a+a}),t-=1)}},t.parseSymbol=function(){var e=this.fetch(),t=e.text;if(/^\\verb[^a-zA-Z]/.test(t)){this.consume();var r=t.slice(5),a="*"===r.charAt(0);if(a&&(r=r.slice(1)),r.length<2||r.charAt(0)!==r.slice(-1))throw new n("\\verb assertion failed --\n                    please report what input caused this bug");return{type:"verb",mode:"text",body:r=r.slice(1,-1),star:a}}Yn.hasOwnProperty(t[0])&&!ae[this.mode][t[0]]&&(this.settings.strict&&"math"===this.mode&&this.settings.reportNonstrict("unicodeTextInMathMode",'Accented Unicode text character "'+t[0]+'" used in math 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