{
  "version": 3,
  "sources": ["../../src/quill-delta/AttributeMap.ts"],
  "sourcesContent": ["// File copied https://github.com/slab/delta/blob/main/src/AttributeMap.ts with changes:\n// - lodash.clonedeep is replaced with JSON parse / stringify\n// - lodash.isequal is replaced with fast-deep-equal.\n\n/**\n * External dependencies\n */\nimport { default as isEqual } from 'fast-deep-equal/es6';\n\nfunction cloneDeep< T >( value: T ): T {\n\treturn JSON.parse( JSON.stringify( value ) ) as T;\n}\n\ninterface AttributeMap {\n\t[ key: string ]: unknown;\n}\n\nnamespace AttributeMap {\n\texport function compose(\n\t\ta: AttributeMap = {},\n\t\tb: AttributeMap = {},\n\t\tkeepNull = false\n\t): AttributeMap | undefined {\n\t\tif ( typeof a !== 'object' ) {\n\t\t\ta = {};\n\t\t}\n\t\tif ( typeof b !== 'object' ) {\n\t\t\tb = {};\n\t\t}\n\t\tlet attributes = cloneDeep( b );\n\t\tif ( ! keepNull ) {\n\t\t\tattributes = Object.keys( attributes ).reduce< AttributeMap >(\n\t\t\t\t( copy, key ) => {\n\t\t\t\t\tif (\n\t\t\t\t\t\tattributes[ key ] !== null ||\n\t\t\t\t\t\tattributes[ key ] !== undefined\n\t\t\t\t\t) {\n\t\t\t\t\t\tcopy[ key ] = attributes[ key ];\n\t\t\t\t\t}\n\t\t\t\t\treturn copy;\n\t\t\t\t},\n\t\t\t\t{}\n\t\t\t);\n\t\t}\n\t\tfor ( const key in a ) {\n\t\t\tif ( a[ key ] !== undefined && b[ key ] === undefined ) {\n\t\t\t\tattributes[ key ] = a[ key ];\n\t\t\t}\n\t\t}\n\t\treturn Object.keys( attributes ).length > 0 ? attributes : undefined;\n\t}\n\n\texport function diff(\n\t\ta: AttributeMap = {},\n\t\tb: AttributeMap = {}\n\t): AttributeMap | undefined {\n\t\tif ( typeof a !== 'object' ) {\n\t\t\ta = {};\n\t\t}\n\t\tif ( typeof b !== 'object' ) {\n\t\t\tb = {};\n\t\t}\n\t\tconst attributes = Object.keys( a )\n\t\t\t.concat( Object.keys( b ) )\n\t\t\t.reduce< AttributeMap >( ( attrs, key ) => {\n\t\t\t\tif ( ! isEqual( a[ key ], b[ key ] ) ) {\n\t\t\t\t\tattrs[ key ] = b[ key ] === undefined ? null : b[ key ];\n\t\t\t\t}\n\t\t\t\treturn attrs;\n\t\t\t}, {} );\n\t\treturn Object.keys( attributes ).length > 0 ? attributes : undefined;\n\t}\n\n\texport function invert(\n\t\tattr: AttributeMap = {},\n\t\tbase: AttributeMap = {}\n\t): AttributeMap {\n\t\tattr = attr || {};\n\t\tconst baseInverted = Object.keys( base ).reduce< AttributeMap >(\n\t\t\t( memo, key ) => {\n\t\t\t\tif (\n\t\t\t\t\tbase[ key ] !== attr[ key ] &&\n\t\t\t\t\tattr[ key ] !== undefined\n\t\t\t\t) {\n\t\t\t\t\tmemo[ key ] = base[ key ];\n\t\t\t\t}\n\t\t\t\treturn memo;\n\t\t\t},\n\t\t\t{}\n\t\t);\n\t\treturn Object.keys( attr ).reduce< AttributeMap >( ( memo, key ) => {\n\t\t\tif ( attr[ key ] !== base[ key ] && base[ key ] === undefined ) {\n\t\t\t\tmemo[ key ] = null;\n\t\t\t}\n\t\t\treturn memo;\n\t\t}, baseInverted );\n\t}\n\n\texport function transform(\n\t\ta: AttributeMap | undefined,\n\t\tb: AttributeMap | undefined,\n\t\tpriority = false\n\t): AttributeMap | undefined {\n\t\tif ( typeof a !== 'object' ) {\n\t\t\treturn b;\n\t\t}\n\t\tif ( typeof b !== 'object' ) {\n\t\t\treturn undefined;\n\t\t}\n\t\tif ( ! priority ) {\n\t\t\treturn b; // b simply overwrites us without priority\n\t\t}\n\t\tconst attributes = Object.keys( b ).reduce< AttributeMap >(\n\t\t\t( attrs, key ) => {\n\t\t\t\tif ( a[ key ] === undefined ) {\n\t\t\t\t\tattrs[ key ] = b[ key ]; // null is a valid value\n\t\t\t\t}\n\t\t\t\treturn attrs;\n\t\t\t},\n\t\t\t{}\n\t\t);\n\t\treturn Object.keys( attributes ).length > 0 ? attributes : undefined;\n\t}\n}\n\nexport default AttributeMap;\n"],
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