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{"version":3,"file":"class-map.js","sources":["../src/directives/class-map.ts"],"sourcesContent":["/**\n * @license\n * Copyright 2018 Google LLC\n * SPDX-License-Identifier: BSD-3-Clause\n */\n\nimport {AttributePart, noChange} from '../lit-html.js';\nimport {\n directive,\n Directive,\n DirectiveParameters,\n PartInfo,\n PartType,\n} from '../directive.js';\n\n/**\n * A key-value set of class names to truthy values.\n */\nexport interface ClassInfo {\n readonly [name: string]: string | boolean | number;\n}\n\nclass ClassMapDirective extends Directive {\n /**\n * Stores the ClassInfo object applied to a given AttributePart.\n * Used to unset existing values when a new ClassInfo object is applied.\n */\n private _previousClasses?: Set<string>;\n private _staticClasses?: Set<string>;\n\n constructor(partInfo: PartInfo) {\n super(partInfo);\n if (\n partInfo.type !== PartType.ATTRIBUTE ||\n partInfo.name !== 'class' ||\n (partInfo.strings?.length as number) > 2\n ) {\n throw new Error(\n '`classMap()` can only be used in the `class` attribute ' +\n 'and must be the only part in the attribute.'\n );\n }\n }\n\n render(classInfo: ClassInfo) {\n // Add spaces to ensure separation from static classes\n return (\n ' ' +\n Object.keys(classInfo)\n .filter((key) => classInfo[key])\n .join(' ') +\n ' '\n );\n }\n\n override update(part: AttributePart, [classInfo]: DirectiveParameters<this>) {\n // Remember dynamic classes on the first render\n if (this._previousClasses === undefined) {\n this._previousClasses = new Set();\n if (part.strings !== undefined) {\n this._staticClasses = new Set(\n part.strings\n .join(' ')\n .split(/\\s/)\n .filter((s) => s !== '')\n );\n }\n for (const name in classInfo) {\n if (classInfo[name] && !this._staticClasses?.has(name)) {\n this._previousClasses.add(name);\n }\n }\n return this.render(classInfo);\n }\n\n const classList = part.element.classList;\n\n // Remove old classes that no longer apply\n // We use forEach() instead of for-of so that we don't require down-level\n // iteration.\n this._previousClasses.forEach((name) => {\n if (!(name in classInfo)) {\n classList.remove(name);\n this._previousClasses!.delete(name);\n }\n });\n\n // Add or remove classes based on their classMap value\n for (const name in classInfo) {\n // We explicitly want a loose truthy check of `value` because it seems\n // more convenient that '' and 0 are skipped.\n const value = !!classInfo[name];\n if (\n value !== this._previousClasses.has(name) &&\n !this._staticClasses?.has(name)\n ) {\n if (value) {\n classList.add(name);\n this._previousClasses.add(name);\n } else {\n classList.remove(name);\n this._previousClasses.delete(name);\n }\n }\n }\n return noChange;\n }\n}\n\n/**\n * A directive that applies dynamic CSS classes.\n *\n * This must be used in the `class` attribute and must be the only part used in\n * the attribute. It takes each property in the `classInfo` argument and adds\n * the property name to the element's `classList` if the property value is\n * truthy; if the property value is falsey, the property name is removed from\n * the element's `class`.\n *\n * For example `{foo: bar}` applies the class `foo` if the value of `bar` is\n * truthy.\n *\n * @param classInfo\n */\nexport const classMap = directive(ClassMapDirective);\n\n/**\n * The type of the class that powers this directive. Necessary for naming the\n * directive's return type.\n */\nexport type {ClassMapDirective};\n"],"names":["classMap","directive","Directive","constructor","partInfo","super","type","PartType","ATTRIBUTE","name","_a","strings","length","Error","render","classInfo","Object","keys","filter","key","join","update","part","undefined","this","_previousClasses","Set","_staticClasses","split","s","has","add","classList","element","forEach","remove","delete","value","_b","noChange"],"mappings":";;;;;SA2HaA,EAAWC,EArGxB,cAAgCC,EAQ9BC,YAAYC,SAEV,GADAC,MAAMD,GAEJA,EAASE,OAASC,EAASC,WACT,UAAlBJ,EAASK,eACRC,EAAAN,EAASO,8BAASC,QAAoB,EAEvC,MAAUC,MACR,qGAIL,CAEDC,OAAOC,GAEL,MACE,IACAC,OAAOC,KAAKF,GACTG,QAAQC,GAAQJ,EAAUI,KAC1BC,KAAK,KACR,GAEH,CAEQC,OAAOC,GAAsBP,YAEpC,QAA8BQ,IAA1BC,KAAKC,GAAgC,CACvCD,KAAKC,GAAmB,IAAIC,SACPH,IAAjBD,EAAKX,UACPa,KAAKG,GAAiB,IAAID,IACxBJ,EAAKX,QACFS,KAAK,KACLQ,MAAM,MACNV,QAAQW,GAAY,KAANA,MAGrB,IAAK,MAAMpB,KAAQM,EACbA,EAAUN,MAA+B,QAArBC,EAAAc,KAAKG,UAAgB,IAAAjB,OAAA,EAAAA,EAAAoB,IAAIrB,KAC/Ce,KAAKC,GAAiBM,IAAItB,GAG9B,OAAOe,KAAKV,OAAOC,EACpB,CAED,MAAMiB,EAAYV,EAAKW,QAAQD,UAK/BR,KAAKC,GAAiBS,SAASzB,IACvBA,KAAQM,IACZiB,EAAUG,OAAO1B,GACjBe,KAAKC,GAAkBW,OAAO3B,GAC/B,IAIH,IAAK,MAAMA,KAAQM,EAAW,CAG5B,MAAMsB,IAAUtB,EAAUN,GAExB4B,IAAUb,KAAKC,GAAiBK,IAAIrB,KACd,QAArB6B,EAAAd,KAAKG,UAAgB,IAAAW,OAAA,EAAAA,EAAAR,IAAIrB,MAEtB4B,GACFL,EAAUD,IAAItB,GACde,KAAKC,GAAiBM,IAAItB,KAE1BuB,EAAUG,OAAO1B,GACjBe,KAAKC,GAAiBW,OAAO3B,IAGlC,CACD,OAAO8B,CACR"} |