smartdown/dist/lib/filament.js

A library for translating, rendering and interacting with Smartdown documents. Smartdown is an extension of Markdown that provides richer media support and reactive programming capability.

(function (global, factory) {
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}(this, (function (exports) { 'use strict';

	function getDefaultExportFromCjs (x) {
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	var ohm_min = {exports: {}};

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(u={})[this.ctorName]=this.children,u},u}(),a=function(u){function t(t,e){var r=this,n=e?e.length:0;return (r=u.call(this,t,"_terminal",n)||this).primitiveValue=e,r}return n(t,u),t.prototype.isTerminal=function(){return !0},t.prototype.toJSON=function(){var u;return (u={})[this.ctorName]=this.primitiveValue,u},t}(o),s=function(u){function t(t,e,r,n,i){var o=u.call(this,t,e,i)||this;return o.children=r,o.childOffsets=n,o}return n(t,u),t.prototype.isNonterminal=function(){return !0},t.prototype.isLexical=function(){return i.isLexical(this.ctorName)},t.prototype.isSyntactic=function(){return i.isSyntactic(this.ctorName)},t}(o),c=function(u){function t(t,e,r,n,i){var o=u.call(this,t,"_iter",n)||this;return o.children=e,o.childOffsets=r,o.optional=i,o}return n(t,u),t.prototype.isIteration=function(){return !0},t.prototype.isOptional=function(){return this.optional},t}(o);u.exports={Node:o,TerminalNode:a,NonterminalNode:s,IterationNode:c};},function(u,t,e){var r,n,i=e(17),o=e(35),a=e(38),s=e(0),c=e(2),l=e(1);function p(u){return Object.keys(u.rules).sort().map((function(t){return u.rules[t]}))}function D(u,t,e,r){if(this.name=u,this.superGrammar=t,this.rules=e,r){if(!(r in e))throw new Error("Invalid start rule: '"+r+"' is not a rule in grammar '"+u+"'");this.defaultStartRule=r;}}D.initApplicationParser=function(u,t){r=u,n=t;},D.prototype={matcher:function(){return new o(this)},isBuiltIn:function(){return this===D.ProtoBuiltInRules||this===D.BuiltInRules},equals:function(u){if(this===u)return !0;if(null==u||this.name!==u.name||this.defaultStartRule!==u.defaultStartRule||this.superGrammar!==u.superGrammar&&!this.superGrammar.equals(u.superGrammar))return !1;var t=p(this),e=p(u);return t.length===e.length&&t.every((function(u,t){return u.description===e[t].description&&u.formals.join(",")===e[t].formals.join(",")&&u.body.toString()===e[t].body.toString()}))},match:function(u,t){var e=this.matcher();return e.replaceInputRange(0,0,u),e.match(t)},trace:function(u,t){var e=this.matcher();return e.replaceInputRange(0,0,u),e.trace(t)},semantics:function(){throw new Error("semantics() is deprecated -- use createSemantics() instead.")},createSemantics:function(){return a.createSemantics(this)},extendSemantics:function(u){return a.createSemantics(this,u._getSemantics())},_checkTopDownActionDict:function(u,t,e){var r,n=[];for(var i in e){var o=e[i];if("_iter"===(r=i)||"_terminal"===r||"_nonterminal"===r||"_default"===r||i in this.rules)if("function"!=typeof o)n.push("'"+i+"' must be a function in an action dictionary for '"+this.name+"'");else {var a=o.length,s=this._topDownActionArity(i);a!==s&&n.push("Semantic action '"+i+"' has the wrong arity: expected "+s+", got "+a);}else n.push("'"+i+"' is not a valid semantic action for '"+this.name+"'");}if(n.length>0){var c=n.map((function(u){return "- "+u})),l=new Error("Found errors in the action dictionary of the '"+t+"' "+u+":\n"+c.join("\n"));throw l.problems=n,l}},_topDownActionArity:function(u){return "_iter"===u||"_nonterminal"===u||"_default"===u?1:"_terminal"===u?0:this.rules[u].body.getArity()},_inheritsFrom:function(u){for(var t=this.superGrammar;t;){if(t.equals(u,!0))return !0;t=t.superGrammar;}return !1},toRecipe:function(u){var t={};this.source&&(t.source=this.source.contents);var e=null;this.superGrammar&&!this.superGrammar.isBuiltIn()&&(e=JSON.parse(this.superGrammar.toRecipe()));var r=null;this.defaultStartRule&&(r=this.defaultStartRule);var n={},i=this;return Object.keys(this.rules).forEach((function(u){var t,e=i.rules[u],r=e.body,o=!i.superGrammar||!i.superGrammar.rules[u];t=o?"define":r instanceof l.Extend?"extend":"override";var a={};if(e.source&&i.source){var s=e.source.relativeTo(i.source);a.sourceInterval=[s.startIdx,s.endIdx];}var c=o?e.description:null,p=r.outputRecipe(e.formals,i.source);n[u]=[t,a,c,e.formals,p];})),JSON.stringify(["grammar",t,this.name,e,r,n])},toOperationActionDictionaryTemplate:function(){return this._toOperationOrAttributeActionDictionaryTemplate()},toAttributeActionDictionaryTemplate:function(){return this._toOperationOrAttributeActionDictionaryTemplate()},_toOperationOrAttributeActionDictionaryTemplate:function(){var u=new s.StringBuffer;u.append("{");var t=!0;for(var e in this.rules){var r=this.rules[e].body;t?t=!1:u.append(","),u.append("\n"),u.append("  "),this.addSemanticActionTemplate(e,r,u);}return u.append("\n}"),u.contents()},addSemanticActionTemplate:function(u,t,e){e.append(u),e.append(": function(");var r=this._topDownActionArity(u);e.append(s.repeat("_",r).join(", ")),e.append(") {\n"),e.append("  }");},parseApplication:function(u){var t;if(-1===u.indexOf("<"))t=new l.Apply(u);else {var e=r.match(u,"Base_application");t=n(e,{});}if(!(t.ruleName in this.rules))throw c.undeclaredRule(t.ruleName,this.name);var i=this.rules[t.ruleName].formals;if(i.length!==t.args.length){var o=this.rules[t.ruleName].source;throw c.wrongNumberOfParameters(t.ruleName,i.length,t.args.length,o)}return t}},D.ProtoBuiltInRules=new D("ProtoBuiltInRules",void 0,{any:{body:l.any,formals:[],description:"any character",primitive:!0},end:{body:l.end,formals:[],description:"end of input",primitive:!0},caseInsensitive:{body:new i(new l.Param(0)),formals:["str"],primitive:!0},lower:{body:new l.UnicodeChar("Ll"),formals:[],description:"a lowercase letter",primitive:!0},upper:{body:new l.UnicodeChar("Lu"),formals:[],description:"an uppercase letter",primitive:!0},unicodeLtmo:{body:new l.UnicodeChar("Ltmo"),formals:[],description:"a Unicode character in Lt, Lm, or Lo",primitive:!0},spaces:{body:new l.Star(new l.Apply("space")),formals:[]},space:{body:new l.Range("\0"," "),formals:[],description:"a space"}}),u.exports=D;},function(u,t){u.exports=function(u,t){if(!t||"object"!=typeof t)return u;var e=Object.keys(t),r=e.length;for(;r--;)u[e[r]]=t[e[r]];return u};},function(u,t,e){var r=e(0).assert,n=e(2),i=e(3);function o(u,t,e){this.sourceString=u,this.startIdx=t,this.endIdx=e;}o.coverage=function(){for(var u=arguments[0].sourceString,t=arguments[0].startIdx,e=arguments[0].endIdx,r=1;r<arguments.length;r++){var i=arguments[r];if(i.sourceString!==u)throw n.intervalSourcesDontMatch();t=Math.min(t,arguments[r].startIdx),e=Math.max(e,arguments[r].endIdx);}return new o(u,t,e)},o.prototype={coverageWith:function(){var u=Array.prototype.slice.call(arguments);return u.push(this),o.coverage.apply(void 0,u)},collapsedLeft:function(){return new o(this.sourceString,this.startIdx,this.startIdx)},collapsedRight:function(){return new o(this.sourceString,this.endIdx,this.endIdx)},getLineAndColumn:function(){return i.getLineAndColumn(this.sourceString,this.startIdx)},getLineAndColumnMessage:function(){var u=[this.startIdx,this.endIdx];return i.getLineAndColumnMessage(this.sourceString,this.startIdx,u)},minus:function(u){if(this.sourceString!==u.sourceString)throw n.intervalSourcesDontMatch();return this.startIdx===u.startIdx&&this.endIdx===u.endIdx?[]:this.startIdx<u.startIdx&&u.endIdx<this.endIdx?[new o(this.sourceString,this.startIdx,u.startIdx),new o(this.sourceString,u.endIdx,this.endIdx)]:this.startIdx<u.endIdx&&u.endIdx<this.endIdx?[new o(this.sourceString,u.endIdx,this.endIdx)]:this.startIdx<u.startIdx&&u.startIdx<this.endIdx?[new o(this.sourceString,this.startIdx,u.startIdx)]:[this]},relativeTo:function(u){if(this.sourceString!==u.sourceString)throw n.intervalSourcesDontMatch();return r(this.startIdx>=u.startIdx&&this.endIdx<=u.endIdx,"other interval does not cover this one"),new o(this.sourceString,this.startIdx-u.startIdx,this.endIdx-u.startIdx)},trimmed:function(){var u=this.contents,t=this.startIdx+u.match(/^\s*/)[0].length,e=this.endIdx-u.match(/\s*$/)[0].length;return new o(this.sourceString,t,e)},subInterval:function(u,t){var e=this.startIdx+u;return new o(this.sourceString,e,e+t)}},Object.defineProperties(o.prototype,{contents:{get:function(){return void 0===this._contents&&(this._contents=this.sourceString.slice(this.startIdx,this.endIdx)),this._contents},enumerable:!0},length:{get:function(){return this.endIdx-this.startIdx},enumerable:!0}}),u.exports=o;},function(u,t,e){var r=e(8);function n(u){this.source=u,this.pos=0,this.examinedLength=0;}n.prototype={atEnd:function(){var u=this.pos===this.source.length;return this.examinedLength=Math.max(this.examinedLength,this.pos+1),u},next:function(){var u=this.source[this.pos++];return this.examinedLength=Math.max(this.examinedLength,this.pos),u},matchString:function(u,t){var e;if(t){for(e=0;e<u.length;e++){var r=this.next(),n=u[e];if(null==r||r.toUpperCase()!==n.toUpperCase())return !1}return !0}for(e=0;e<u.length;e++)if(this.next()!==u[e])return !1;return !0},sourceSlice:function(u,t){return this.source.slice(u,t)},interval:function(u,t){return new r(this.source,u,t||this.pos)}},u.exports=n;},function(u,t,e){var r=e(0),n=e(3),i=e(8);function o(u,t,e,i,o,a,s){this.matcher=u,this.input=t,this.startExpr=e,this._cst=i,this._cstOffset=o,this._rightmostFailurePosition=a,this._rightmostFailures=s,this.failed()&&(r.defineLazyProperty(this,"message",(function(){var u="Expected "+this.getExpectedText();return n.getLineAndColumnMessage(this.input,this.getRightmostFailurePosition())+u})),r.defineLazyProperty(this,"shortMessage",(function(){var u="expected "+this.getExpectedText(),t=n.getLineAndColumn(this.input,this.getRightmostFailurePosition());return "Line "+t.lineNum+", col "+t.colNum+": "+u})));}o.prototype.succeeded=function(){return !!this._cst},o.prototype.failed=function(){return !this.succeeded()},o.prototype.getRightmostFailurePosition=function(){return this._rightmostFailurePosition},o.prototype.getRightmostFailures=function(){if(!this._rightmostFailures){this.matcher.setInput(this.input);var u=this.matcher._match(this.startExpr,!1,this.getRightmostFailurePosition());this._rightmostFailures=u.getRightmostFailures();}return this._rightmostFailures},o.prototype.toString=function(){return this.succeeded()?"[match succeeded]":"[match failed at position "+this.getRightmostFailurePosition()+"]"},o.prototype.getExpectedText=function(){if(this.succeeded())throw new Error("cannot get expected text of a successful MatchResult");var u=new r.StringBuffer,t=this.getRightmostFailures();t=t.filter((function(u){return !u.isFluffy()}));for(var e=0;e<t.length;e++)e>0&&(e===t.length-1?u.append(t.length>2?", or ":" or "):u.append(", ")),u.append(t[e].toString());return u.contents()},o.prototype.getInterval=function(){var u=this.getRightmostFailurePosition();return new i(this.input,u,u)},u.exports=o;},function(u,t,e){function r(u,t,e){if(!function(u){return "description"===u||"string"===u||"code"===u}(e))throw new Error("invalid Failure type: "+e);this.pexpr=u,this.text=t,this.type=e,this.fluffy=!1;}r.prototype.getPExpr=function(){return this.pexpr},r.prototype.getText=function(){return this.text},r.prototype.getType=function(){return this.type},r.prototype.isDescription=function(){return "description"===this.type},r.prototype.isStringTerminal=function(){return "string"===this.type},r.prototype.isCode=function(){return "code"===this.type},r.prototype.isFluffy=function(){return this.fluffy},r.prototype.makeFluffy=function(){this.fluffy=!0;},r.prototype.clearFluffy=function(){this.fluffy=!1;},r.prototype.subsumes=function(u){return this.getText()===u.getText()&&this.type===u.type&&(!this.isFluffy()||this.isFluffy()&&u.isFluffy())},r.prototype.toString=function(){return "string"===this.type?JSON.stringify(this.getText()):this.getText()},r.prototype.clone=function(){var u=new r(this.pexpr,this.text,this.type);return this.isFluffy()&&u.makeFluffy(),u},r.prototype.toKey=function(){return this.toString()+"#"+this.type},u.exports=r;},function(u,t,e){var r=e(7);function n(){}n.prototype=Object.create(null),n.asNamespace=function(u){return u instanceof n?u:n.createNamespace(u)},n.createNamespace=function(u){return n.extend(n.prototype,u)},n.extend=function(u,t){if(u!==n.prototype&&!(u instanceof n))throw new TypeError("not a Namespace object: "+u);var e=Object.create(u,{constructor:{value:n,enumerable:!1,writable:!0,configurable:!0}});return r(e,t)},n.toString=function(u){return Object.prototype.toString.call(u)},u.exports=n;},function(u,t,e){var r=e(8),n=e(0),i={succeeded:1,isRootNode:2,isImplicitSpaces:4,isMemoized:8,isHeadOfLeftRecursion:16,terminatesLR:32};function o(u){return "string"==typeof u?u.replace(/ /g,"⋅").replace(/\t/g,"␉").replace(/\n/g,"␊").replace(/\r/g,"␍"):String(u)}function a(u,t,e,n,o,a,s){this.input=u,this.pos=this.pos1=t,this.pos2=e,this.source=new r(u,t,e),this.expr=n,this.bindings=a,this.children=s||[],this.terminatingLREntry=null,this._flags=o?i.succeeded:0;}a.prototype.SKIP={},Object.defineProperty(a.prototype,"displayString",{get:function(){return this.expr.toDisplayString()}}),Object.keys(i).forEach((function(u){var t=i[u];Object.defineProperty(a.prototype,u,{get:function(){return 0!=(this._flags&t)},set:function(u){u?this._flags|=t:this._flags&=~t;}});})),a.prototype.clone=function(){return this.cloneWithExpr(this.expr)},a.prototype.cloneWithExpr=function(u){var t=new a(this.input,this.pos,this.pos2,u,this.succeeded,this.bindings,this.children);return t.isHeadOfLeftRecursion=this.isHeadOfLeftRecursion,t.isImplicitSpaces=this.isImplicitSpaces,t.isMemoized=this.isMemoized,t.isRootNode=this.isRootNode,t.terminatesLR=this.terminatesLR,t.terminatingLREntry=this.terminatingLREntry,t},a.prototype.recordLRTermination=function(u,t){this.terminatingLREntry=new a(this.input,this.pos,this.pos2,this.expr,!1,[t],[u]),this.terminatingLREntry.terminatesLR=!0;},a.prototype.walk=function(u,t){var e=u;function r(u,n,i){var o=!0;e.enter&&e.enter.call(t,u,n,i)===a.prototype.SKIP&&(o=!1),o&&(u.children.forEach((function(t){r(t,u,i+1);})),e.exit&&e.exit.call(t,u,n,i));}"function"==typeof e&&(e={enter:e}),this.isRootNode?this.children.forEach((function(u){r(u,null,0);})):r(this,null,0);},a.prototype.toString=function(){var u=this,t=new n.StringBuffer;return this.walk((function(e,r,i){if(!e)return u.SKIP;if("Alt"!==e.expr.constructor.name){var a,s,c,l,p;if(t.append((s=e.input,c=e.pos,l=10,((p=o(s.slice(c,c+l))).length<l?p+n.repeat(" ",l-p.length).join(""):p)+(a=2*i+1,n.repeat(" ",a).join("")))),t.append((e.succeeded?"✓":"✗")+" "+e.displayString),e.isHeadOfLeftRecursion&&t.append(" (LR)"),e.succeeded){var D=o(e.source.contents);t.append(" ⇒  "),t.append("string"==typeof D?'"'+D+'"':D);}t.append("\n");}})),t.contents()},u.exports=a;},function(u,t,e){var r=e(1),n=e(10),i=e(6),o=e(7),a={_terminal:function(){return this.primitiveValue},_nonterminal:function(u){var t=this._node.ctorName,e=this.args.mapping;if(!e.hasOwnProperty(t)){if(this._node instanceof r.Alt||this._node instanceof r.Apply)return u[0].toAST(e);if(this.isLexical())return this.sourceString;var n=u.filter((function(u){return !u.isTerminal()}));if(1===n.length)return n[0].toAST(e)}if("number"==typeof e[t])return u[e[t]].toAST(e);var i=e[t]||u,o={type:t};for(var a in i){var s=e[t]&&e[t][a];"number"==typeof s?o[a]=u[s].toAST(e):"string"==typeof s||"boolean"==typeof s||null===s?o[a]=s:"object"==typeof s&&s instanceof Number?o[a]=Number(s):"function"==typeof s?o[a]=s.call(this,u):void 0===s&&(u[a]&&!u[a].isTerminal()?o[a]=u[a].toAST(e):delete o[a]);}return o},_iter:function(u){return this._node.isOptional()?0===this.numChildren?null:u[0].toAST(this.args.mapping):u.map((function(u){return u.toAST(this.args.mapping)}),this)},NonemptyListOf:function(u,t,e){return [u.toAST(this.args.mapping)].concat(e.toAST(this.args.mapping))},EmptyListOf:function(){return []}};u.exports={helper:function(u,t){if(!(u instanceof n)||u.failed())throw new Error("toAST() expects a succesfull MatchResult as first parameter");t=o({},t);var e=o({},a);for(var r in t)"function"==typeof t[r]&&(e[r]=t[r],delete t[r]);return u._cst.grammar.createSemantics().addOperation("toAST(mapping)",e)(u).toAST(t)},semantics:function(u){if(!(u instanceof i))throw new Error("semanticsToAST() expects a Grammar as parameter");return u.createSemantics().addOperation("toAST(mapping)",a)}};},function(u,t,e){var r=e(16),n=e(1);function i(){}i.prototype={currentDecl:null,currentRuleName:null,newGrammar:function(u){return new r(u)},grammar:function(u,t,e,n,i){var o=this,a=new r(t);return e&&a.withSuperGrammar(this.fromRecipe(e)),n&&a.withDefaultStartRule(n),u&&u.source&&a.withSource(u.source),this.currentDecl=a,Object.keys(i).forEach((function(u){o.currentRuleName=u;var t,e=i[u],r=e[0],n=e[1],s=e[2],c=e[3],l=o.fromRecipe(e[4]);a.source&&n&&n.sourceInterval&&(t=a.source.subInterval(n.sourceInterval[0],n.sourceInterval[1]-n.sourceInterval[0])),a[r](u,c,l,s,t);})),this.currentRuleName=this.currentDecl=null,a.build()},terminal:function(u){return new n.Terminal(u)},range:function(u,t){return new n.Range(u,t)},param:function(u){return new n.Param(u)},alt:function(){for(var u=[],t=0;t<arguments.length;t++){var e=arguments[t];e instanceof n.PExpr||(e=this.fromRecipe(e)),e instanceof n.Alt?u=u.concat(e.terms):u.push(e);}return 1===u.length?u[0]:new n.Alt(u)},seq:function(){for(var u=[],t=0;t<arguments.length;t++){var e=arguments[t];e instanceof n.PExpr||(e=this.fromRecipe(e)),e instanceof n.Seq?u=u.concat(e.factors):u.push(e);}return 1===u.length?u[0]:new n.Seq(u)},star:function(u){return u instanceof n.PExpr||(u=this.fromRecipe(u)),new n.Star(u)},plus:function(u){return u instanceof n.PExpr||(u=this.fromRecipe(u)),new n.Plus(u)},opt:function(u){return u instanceof n.PExpr||(u=this.fromRecipe(u)),new n.Opt(u)},not:function(u){return u instanceof n.PExpr||(u=this.fromRecipe(u)),new n.Not(u)},la:function(u){return this.lookahead(u)},lookahead:function(u){return u instanceof n.PExpr||(u=this.fromRecipe(u)),new n.Lookahead(u)},lex:function(u){return u instanceof n.PExpr||(u=this.fromRecipe(u)),new n.Lex(u)},app:function(u,t){return t&&t.length>0&&(t=t.map((function(u){return u instanceof n.PExpr?u:this.fromRecipe(u)}),this)),new n.Apply(u,t)},splice:function(u,t){var e=this;return new n.Splice(this.currentDecl.superGrammar,this.currentRuleName,u.map((function(u){return e.fromRecipe(u)})),t.map((function(u){return e.fromRecipe(u)})))},fromRecipe:function(u){var t=this[u[0]].apply(this,"grammar"===u[0]?u.slice(1):u.slice(2)),e=u[1];return e&&e.sourceInterval&&this.currentDecl&&t.withSource(this.currentDecl.sourceInterval.apply(this.currentDecl,e.sourceInterval)),t}},u.exports=i;},function(u,t,e){var r=e(6),n=e(9),i=e(0),o=e(2),a=e(1);function s(u){this.name=u;}s.prototype.sourceInterval=function(u,t){return this.source.subInterval(u,t-u)},s.prototype.ensureSuperGrammar=function(){return this.superGrammar||this.withSuperGrammar("BuiltInRules"===this.name?r.ProtoBuiltInRules:r.BuiltInRules),this.superGrammar},s.prototype.ensureSuperGrammarRuleForOverriding=function(u,t){var e=this.ensureSuperGrammar().rules[u];if(!e)throw o.cannotOverrideUndeclaredRule(u,this.superGrammar.name,t);return e},s.prototype.installOverriddenOrExtendedRule=function(u,t,e,r){var n=i.getDuplicates(t);if(n.length>0)throw o.duplicateParameterNames(u,n,r);var a=this.ensureSuperGrammar().rules[u],s=a.formals,c=s?s.length:0;if(t.length!==c)throw o.wrongNumberOfParameters(u,c,t.length,r);return this.install(u,t,e,a.description,r)},s.prototype.install=function(u,t,e,r,n){return this.rules[u]={body:e.introduceParams(t),formals:t,description:r,source:n},this},s.prototype.withSuperGrammar=function(u){if(this.superGrammar)throw new Error("the super grammar of a GrammarDecl cannot be set more than once");return this.superGrammar=u,this.rules=Object.create(u.rules),u.isBuiltIn()||(this.defaultStartRule=u.defaultStartRule),this},s.prototype.withDefaultStartRule=function(u){return this.defaultStartRule=u,this},s.prototype.withSource=function(u){return this.source=new n(u).interval(0,u.length),this},s.prototype.build=function(){var u=new r(this.name,this.ensureSuperGrammar(),this.rules,this.defaultStartRule),t=[],e=!1;return Object.keys(u.rules).forEach((function(r){var n=u.rules[r].body;try{n.assertChoicesHaveUniformArity(r);}catch(u){t.push(u);}try{n.assertAllApplicationsAreValid(r,u);}catch(u){t.push(u),e=!0;}})),e||Object.keys(u.rules).forEach((function(e){var r=u.rules[e].body;try{r.assertIteratedExprsAreNotNullable(u,[]);}catch(u){t.push(u);}})),t.length>0&&o.throwErrors(t),this.source&&(u.source=this.source),u},s.prototype.define=function(u,t,e,r,n){if(this.ensureSuperGrammar(),this.superGrammar.rules[u])throw o.duplicateRuleDeclaration(u,this.name,this.superGrammar.name,n);if(this.rules[u])throw o.duplicateRuleDeclaration(u,this.name,this.name,n);var a=i.getDuplicates(t);if(a.length>0)throw o.duplicateParameterNames(u,a,n);return this.install(u,t,e,r,n)},s.prototype.override=function(u,t,e,r,n){return this.ensureSuperGrammarRuleForOverriding(u,n),this.installOverriddenOrExtendedRule(u,t,e,n),this},s.prototype.extend=function(u,t,e,r,n){if(!this.ensureSuperGrammar().rules[u])throw o.cannotExtendUndeclaredRule(u,this.superGrammar.name,n);var 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