97 lines
1.7 KiB
JavaScript
97 lines
1.7 KiB
JavaScript
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import NodeFunction from '../core/NodeFunction.js';
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import NodeFunctionInput from '../core/NodeFunctionInput.js';
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const declarationRegexp = /^fn\s*([a-z_0-9]+)?\s*\(([\s\S]*?)\)\s*\-\>\s*([a-z_0-9]+)?/i;
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const propertiesRegexp = /[a-z_0-9]+/ig;
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const parse = ( source ) => {
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source = source.trim();
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const declaration = source.match( declarationRegexp );
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if ( declaration !== null && declaration.length === 4 ) {
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// tokenizer
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const inputsCode = declaration[ 2 ];
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const propsMatches = [];
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let nameMatch = null;
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while ( ( nameMatch = propertiesRegexp.exec( inputsCode ) ) !== null ) {
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propsMatches.push( nameMatch );
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}
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// parser
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const inputs = [];
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let i = 0;
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while ( i < propsMatches.length ) {
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// default
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const name = propsMatches[ i ++ ][ 0 ];
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const type = propsMatches[ i ++ ][ 0 ];
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// precision
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if ( i < propsMatches.length && /^[fui]\d{2}$/.test( propsMatches[ i ][ 0 ] ) === true )
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i ++;
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// add input
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inputs.push( new NodeFunctionInput( type, name ) );
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}
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//
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const blockCode = source.substring( declaration[ 0 ].length );
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const name = declaration[ 1 ] !== undefined ? declaration[ 1 ] : '';
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const type = declaration[ 3 ];
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return {
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type,
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inputs,
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name,
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inputsCode,
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blockCode
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};
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} else {
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throw new Error( 'FunctionNode: Function is not a WGSL code.' );
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}
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};
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class WGSLNodeFunction extends NodeFunction {
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constructor( source ) {
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const { type, inputs, name, inputsCode, blockCode } = parse( source );
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super( type, inputs, name );
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this.inputsCode = inputsCode;
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this.blockCode = blockCode;
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}
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getCode( name = this.name ) {
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return `fn ${ name } ( ${ this.inputsCode.trim() } ) -> ${ this.type }` + this.blockCode;
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}
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}
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export default WGSLNodeFunction;
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