58 lines
1023 B
JavaScript
58 lines
1023 B
JavaScript
const Echo = Class( 'Echo',
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{
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'virtual public echo'( str )
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{
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return str;
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},
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} );
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const Prefix = Trait( 'Prefix' )
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.extend( Echo,
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{
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'private _prefix': '',
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__mixin( prefix )
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{
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this._prefix = ''+prefix;
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},
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'public abstract override echo'( str )
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{
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return this._prefix + this.__super( str );
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},
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} );
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const Suffix = Trait( 'Suffix' )
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.extend( Echo,
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{
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'private _suffix': '',
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__mixin( suffix )
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{
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this._suffix = ''+suffix;
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},
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'public abstract override echo'( str )
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{
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return this.__super( str ) + this._suffix;
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},
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} );
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const UpperCase = Trait( 'UpperCase' )
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.extend( Echo,
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{
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'public abstract override echo'( str )
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{
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return this.__super( str ).toUpperCase();
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}
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} );
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// stackable, parameterized traits
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Echo.use( Prefix( "Bar" ) )
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.use( Suffix( "Baz" ) )
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.use( UpperCase )
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.use( Prefix( "Foo" ) )
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.use( Suffix( "Quux" ) )().echo( "Inner" );
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// result: FooBARINNERBAZQuux
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