942 lines
17 KiB
JavaScript
942 lines
17 KiB
JavaScript
|
import { Program, FunctionDeclaration, For, AccessorElements, Ternary, Varying, DynamicElement, StaticElement, FunctionParameter, Unary, Conditional, VariableDeclaration, Operator, Number, String, FunctionCall, Return, Accessor, Uniform } from './AST.js';
|
||
|
|
|
||
|
|
const unaryOperators = [
|
||
|
|
'+', '-', '~', '!', '++', '--'
|
||
|
|
];
|
||
|
|
|
||
|
|
const precedenceOperators = [
|
||
|
|
'*', '/', '%',
|
||
|
|
'-', '+',
|
||
|
|
'<<', '>>',
|
||
|
|
'<', '>', '<=', '>=',
|
||
|
|
'==', '!=',
|
||
|
|
'&',
|
||
|
|
'^',
|
||
|
|
'|',
|
||
|
|
'&&',
|
||
|
|
'^^',
|
||
|
|
'||',
|
||
|
|
'?',
|
||
|
|
'=',
|
||
|
|
'+=', '-=', '*=', '/=', '%=', '^=', '&=', '|=', '<<=', '>>=',
|
||
|
|
','
|
||
|
|
].reverse();
|
||
|
|
|
||
|
|
const spaceRegExp = /^((\t| )\n*)+/;
|
||
|
|
const lineRegExp = /^\n+/;
|
||
|
|
const commentRegExp = /^\/\*[\s\S]*?\*\//;
|
||
|
|
const inlineCommentRegExp = /^\/\/.*?(\n|$)/;
|
||
|
|
|
||
|
|
const numberRegExp = /^((0x\w+)|(\.?\d+\.?\d*((e-?\d+)|\w)?))/;
|
||
|
|
const stringDoubleRegExp = /^(\"((?:[^"\\]|\\.)*)\")/;
|
||
|
|
const stringSingleRegExp = /^(\'((?:[^'\\]|\\.)*)\')/;
|
||
|
|
const literalRegExp = /^[A-Za-z](\w|\.)*/;
|
||
|
|
const operatorsRegExp = new RegExp( '^(\\' + [
|
||
|
|
'<<=', '>>=', '++', '--', '<<', '>>', '+=', '-=', '*=', '/=', '%=', '&=', '^^', '^=', '|=',
|
||
|
|
'<=', '>=', '==', '!=', '&&', '||',
|
||
|
|
'(', ')', '[', ']', '{', '}',
|
||
|
|
'.', ',', ';', '!', '=', '~', '*', '/', '%', '+', '-', '<', '>', '&', '^', '|', '?', ':', '#'
|
||
|
|
].join( '$' ).split( '' ).join( '\\' ).replace( /\\\$/g, '|' ) + ')' );
|
||
|
|
|
||
|
|
function getGroupDelta( str ) {
|
||
|
|
|
||
|
|
if ( str === '(' || str === '[' || str === '{' ) return 1;
|
||
|
|
if ( str === ')' || str === ']' || str === '}' ) return - 1;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
class Token {
|
||
|
|
|
||
|
|
constructor( tokenizer, type, str, pos ) {
|
||
|
|
|
||
|
|
this.tokenizer = tokenizer;
|
||
|
|
|
||
|
|
this.type = type;
|
||
|
|
|
||
|
|
this.str = str;
|
||
|
|
this.pos = pos;
|
||
|
|
|
||
|
|
this.tag = null;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
get endPos() {
|
||
|
|
|
||
|
|
return this.pos + this.str.length;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
get isNumber() {
|
||
|
|
|
||
|
|
return this.type === Token.NUMBER;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
get isString() {
|
||
|
|
|
||
|
|
return this.type === Token.STRING;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
get isLiteral() {
|
||
|
|
|
||
|
|
return this.type === Token.LITERAL;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
get isOperator() {
|
||
|
|
|
||
|
|
return this.type === Token.OPERATOR;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
Token.LINE = 'line';
|
||
|
|
Token.COMMENT = 'comment';
|
||
|
|
Token.NUMBER = 'number';
|
||
|
|
Token.STRING = 'string';
|
||
|
|
Token.LITERAL = 'literal';
|
||
|
|
Token.OPERATOR = 'operator';
|
||
|
|
|
||
|
|
const TokenParserList = [
|
||
|
|
{ type: Token.LINE, regexp: lineRegExp, isTag: true },
|
||
|
|
{ type: Token.COMMENT, regexp: commentRegExp, isTag: true },
|
||
|
|
{ type: Token.COMMENT, regexp: inlineCommentRegExp, isTag: true },
|
||
|
|
{ type: Token.NUMBER, regexp: numberRegExp },
|
||
|
|
{ type: Token.STRING, regexp: stringDoubleRegExp, group: 2 },
|
||
|
|
{ type: Token.STRING, regexp: stringSingleRegExp, group: 2 },
|
||
|
|
{ type: Token.LITERAL, regexp: literalRegExp },
|
||
|
|
{ type: Token.OPERATOR, regexp: operatorsRegExp }
|
||
|
|
];
|
||
|
|
|
||
|
|
class Tokenizer {
|
||
|
|
|
||
|
|
constructor( source ) {
|
||
|
|
|
||
|
|
this.source = source;
|
||
|
|
this.position = 0;
|
||
|
|
|
||
|
|
this.tokens = [];
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
tokenize() {
|
||
|
|
|
||
|
|
let token = this.readToken();
|
||
|
|
|
||
|
|
while ( token ) {
|
||
|
|
|
||
|
|
this.tokens.push( token );
|
||
|
|
|
||
|
|
token = this.readToken();
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
return this;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
skip( ...params ) {
|
||
|
|
|
||
|
|
let remainingCode = this.source.substr( this.position );
|
||
|
|
let i = params.length;
|
||
|
|
|
||
|
|
while ( i -- ) {
|
||
|
|
|
||
|
|
const skip = params[ i ].exec( remainingCode );
|
||
|
|
const skipLength = skip ? skip[ 0 ].length : 0;
|
||
|
|
|
||
|
|
if ( skipLength > 0 ) {
|
||
|
|
|
||
|
|
this.position += skipLength;
|
||
|
|
|
||
|
|
remainingCode = this.source.substr( this.position );
|
||
|
|
|
||
|
|
// re-skip, new remainingCode is generated
|
||
|
|
// maybe exist previous regexp non detected
|
||
|
|
i = params.length;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
return remainingCode;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
readToken() {
|
||
|
|
|
||
|
|
const remainingCode = this.skip( spaceRegExp );
|
||
|
|
|
||
|
|
for ( var i = 0; i < TokenParserList.length; i ++ ) {
|
||
|
|
|
||
|
|
const parser = TokenParserList[ i ];
|
||
|
|
const result = parser.regexp.exec( remainingCode );
|
||
|
|
|
||
|
|
if ( result ) {
|
||
|
|
|
||
|
|
const token = new Token( this, parser.type, result[ parser.group || 0 ], this.position );
|
||
|
|
|
||
|
|
this.position += result[ 0 ].length;
|
||
|
|
|
||
|
|
if ( parser.isTag ) {
|
||
|
|
|
||
|
|
const nextToken = this.readToken();
|
||
|
|
|
||
|
|
if ( nextToken ) {
|
||
|
|
|
||
|
|
nextToken.tag = token;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
return nextToken;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
return token;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
const isType = ( str ) => /void|bool|float|u?int|(u|i)?vec[234]/.test( str );
|
||
|
|
|
||
|
|
class GLSLDecoder {
|
||
|
|
|
||
|
|
constructor() {
|
||
|
|
|
||
|
|
this.index = 0;
|
||
|
|
this.tokenizer = null;
|
||
|
|
this.keywords = [];
|
||
|
|
|
||
|
|
this._currentFunction = null;
|
||
|
|
|
||
|
|
this.addPolyfill( 'gl_FragCoord', 'vec2 gl_FragCoord = vec2( viewportCoordinate.x, viewportCoordinate.y.oneMinus() );' );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
addPolyfill( name, polyfill ) {
|
||
|
|
|
||
|
|
this.keywords.push( { name, polyfill } );
|
||
|
|
|
||
|
|
return this;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
get tokens() {
|
||
|
|
|
||
|
|
return this.tokenizer.tokens;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
readToken() {
|
||
|
|
|
||
|
|
return this.tokens[ this.index ++ ];
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
getToken( offset = 0 ) {
|
||
|
|
|
||
|
|
return this.tokens[ this.index + offset ];
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
getTokensUntil( str, tokens, offset = 0 ) {
|
||
|
|
|
||
|
|
const output = [];
|
||
|
|
|
||
|
|
let groupIndex = 0;
|
||
|
|
|
||
|
|
for ( let i = offset; i < tokens.length; i ++ ) {
|
||
|
|
|
||
|
|
const token = tokens[ i ];
|
||
|
|
|
||
|
|
groupIndex += getGroupDelta( token.str );
|
||
|
|
|
||
|
|
output.push( token );
|
||
|
|
|
||
|
|
if ( groupIndex === 0 && token.str === str ) {
|
||
|
|
|
||
|
|
break;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
return output;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
readTokensUntil( str ) {
|
||
|
|
|
||
|
|
const tokens = this.getTokensUntil( str, this.tokens, this.index );
|
||
|
|
|
||
|
|
this.index += tokens.length;
|
||
|
|
|
||
|
|
return tokens;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
parseExpressionFromTokens( tokens ) {
|
||
|
|
|
||
|
|
if ( tokens.length === 0 ) return null;
|
||
|
|
|
||
|
|
const firstToken = tokens[ 0 ];
|
||
|
|
const lastToken = tokens[ tokens.length - 1 ];
|
||
|
|
|
||
|
|
// precedence operators
|
||
|
|
|
||
|
|
let groupIndex = 0;
|
||
|
|
|
||
|
|
for ( const operator of precedenceOperators ) {
|
||
|
|
|
||
|
|
for ( let i = 0; i < tokens.length; i ++ ) {
|
||
|
|
|
||
|
|
const token = tokens[ i ];
|
||
|
|
|
||
|
|
groupIndex += getGroupDelta( token.str );
|
||
|
|
|
||
|
|
if ( ! token.isOperator || i === 0 || i === tokens.length - 1 ) continue;
|
||
|
|
|
||
|
|
if ( groupIndex === 0 && token.str === operator ) {
|
||
|
|
|
||
|
|
if ( operator === '?' ) {
|
||
|
|
|
||
|
|
const conditionTokens = tokens.slice( 0, i );
|
||
|
|
const leftTokens = this.getTokensUntil( ':', tokens, i + 1 ).slice( 0, - 1 );
|
||
|
|
const rightTokens = tokens.slice( i + leftTokens.length + 2 );
|
||
|
|
|
||
|
|
const condition = this.parseExpressionFromTokens( conditionTokens );
|
||
|
|
const left = this.parseExpressionFromTokens( leftTokens );
|
||
|
|
const right = this.parseExpressionFromTokens( rightTokens );
|
||
|
|
|
||
|
|
return new Ternary( condition, left, right );
|
||
|
|
|
||
|
|
} else {
|
||
|
|
|
||
|
|
const left = this.parseExpressionFromTokens( tokens.slice( 0, i ) );
|
||
|
|
const right = this.parseExpressionFromTokens( tokens.slice( i + 1, tokens.length ) );
|
||
|
|
|
||
|
|
return this._evalOperator( new Operator( operator, left, right ) );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( groupIndex < 0 ) {
|
||
|
|
|
||
|
|
return this.parseExpressionFromTokens( tokens.slice( 0, i ) );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
// unary operators (before)
|
||
|
|
|
||
|
|
if ( firstToken.isOperator ) {
|
||
|
|
|
||
|
|
for ( const operator of unaryOperators ) {
|
||
|
|
|
||
|
|
if ( firstToken.str === operator ) {
|
||
|
|
|
||
|
|
const right = this.parseExpressionFromTokens( tokens.slice( 1 ) );
|
||
|
|
|
||
|
|
return new Unary( operator, right );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// unary operators (after)
|
||
|
|
|
||
|
|
if ( lastToken.isOperator ) {
|
||
|
|
|
||
|
|
for ( const operator of unaryOperators ) {
|
||
|
|
|
||
|
|
if ( lastToken.str === operator ) {
|
||
|
|
|
||
|
|
const left = this.parseExpressionFromTokens( tokens.slice( 0, tokens.length - 1 ) );
|
||
|
|
|
||
|
|
return new Unary( operator, left, true );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
// groups
|
||
|
|
|
||
|
|
if ( firstToken.str === '(' ) {
|
||
|
|
|
||
|
|
const leftTokens = this.getTokensUntil( ')', tokens );
|
||
|
|
|
||
|
|
const left = this.parseExpressionFromTokens( leftTokens.slice( 1, leftTokens.length - 1 ) );
|
||
|
|
|
||
|
|
const operator = tokens[ leftTokens.length ];
|
||
|
|
|
||
|
|
if ( operator ) {
|
||
|
|
|
||
|
|
const rightTokens = tokens.slice( leftTokens.length + 1 );
|
||
|
|
const right = this.parseExpressionFromTokens( rightTokens );
|
||
|
|
|
||
|
|
return this._evalOperator( new Operator( operator.str, left, right ) );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
return left;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
// primitives and accessors
|
||
|
|
|
||
|
|
if ( firstToken.isNumber ) {
|
||
|
|
|
||
|
|
let type;
|
||
|
|
|
||
|
|
const isHex = /^(0x)/.test( firstToken.str );
|
||
|
|
|
||
|
|
if ( isHex ) type = 'int';
|
||
|
|
else if ( /u$/.test( firstToken.str ) ) type = 'uint';
|
||
|
|
else if ( /f|e|\./.test( firstToken.str ) ) type = 'float';
|
||
|
|
else type = 'int';
|
||
|
|
|
||
|
|
let str = firstToken.str.replace( /u|i$/, '' );
|
||
|
|
|
||
|
|
if ( isHex === false ) {
|
||
|
|
|
||
|
|
str = str.replace( /f$/, '' );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
return new Number( str, type );
|
||
|
|
|
||
|
|
} else if ( firstToken.isString ) {
|
||
|
|
|
||
|
|
return new String( firstToken.str );
|
||
|
|
|
||
|
|
} else if ( firstToken.isLiteral ) {
|
||
|
|
|
||
|
|
if ( firstToken.str === 'return' ) {
|
||
|
|
|
||
|
|
return new Return( this.parseExpressionFromTokens( tokens.slice( 1 ) ) );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
const secondToken = tokens[ 1 ];
|
||
|
|
|
||
|
|
if ( secondToken ) {
|
||
|
|
|
||
|
|
if ( secondToken.str === '(' ) {
|
||
|
|
|
||
|
|
// function call
|
||
|
|
|
||
|
|
const paramsTokens = this.parseFunctionParametersFromTokens( tokens.slice( 2, tokens.length - 1 ) );
|
||
|
|
|
||
|
|
return new FunctionCall( firstToken.str, paramsTokens );
|
||
|
|
|
||
|
|
} else if ( secondToken.str === '[' ) {
|
||
|
|
|
||
|
|
// array accessor
|
||
|
|
|
||
|
|
const elements = [];
|
||
|
|
|
||
|
|
let currentTokens = tokens.slice( 1 );
|
||
|
|
|
||
|
|
while ( currentTokens.length > 0 ) {
|
||
|
|
|
||
|
|
const token = currentTokens[ 0 ];
|
||
|
|
|
||
|
|
if ( token.str === '[' ) {
|
||
|
|
|
||
|
|
const accessorTokens = this.getTokensUntil( ']', currentTokens );
|
||
|
|
|
||
|
|
const element = this.parseExpressionFromTokens( accessorTokens.slice( 1, accessorTokens.length - 1 ) );
|
||
|
|
|
||
|
|
currentTokens = currentTokens.slice( accessorTokens.length );
|
||
|
|
|
||
|
|
elements.push( new DynamicElement( element ) );
|
||
|
|
|
||
|
|
} else if ( token.str === '.' ) {
|
||
|
|
|
||
|
|
const accessorTokens = currentTokens.slice( 1, 2 );
|
||
|
|
|
||
|
|
const element = this.parseExpressionFromTokens( accessorTokens );
|
||
|
|
|
||
|
|
currentTokens = currentTokens.slice( 2 );
|
||
|
|
|
||
|
|
elements.push( new StaticElement( element ) );
|
||
|
|
|
||
|
|
} else {
|
||
|
|
|
||
|
|
console.error( 'Unknown accessor expression', token );
|
||
|
|
|
||
|
|
break;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
return new AccessorElements( firstToken.str, elements );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
return new Accessor( firstToken.str );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
parseFunctionParametersFromTokens( tokens ) {
|
||
|
|
|
||
|
|
if ( tokens.length === 0 ) return [];
|
||
|
|
|
||
|
|
const expression = this.parseExpressionFromTokens( tokens );
|
||
|
|
const params = [];
|
||
|
|
|
||
|
|
let current = expression;
|
||
|
|
|
||
|
|
while ( current.type === ',' ) {
|
||
|
|
|
||
|
|
params.push( current.left );
|
||
|
|
|
||
|
|
current = current.right;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
params.push( current );
|
||
|
|
|
||
|
|
return params;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
parseExpression() {
|
||
|
|
|
||
|
|
const tokens = this.readTokensUntil( ';' );
|
||
|
|
|
||
|
|
const exp = this.parseExpressionFromTokens( tokens.slice( 0, tokens.length - 1 ) );
|
||
|
|
|
||
|
|
return exp;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
parseFunctionParams( tokens ) {
|
||
|
|
|
||
|
|
const params = [];
|
||
|
|
|
||
|
|
for ( let i = 0; i < tokens.length; i ++ ) {
|
||
|
|
|
||
|
|
const immutable = tokens[ i ].str === 'const';
|
||
|
|
if ( immutable ) i ++;
|
||
|
|
|
||
|
|
let qualifier = tokens[ i ].str;
|
||
|
|
|
||
|
|
if ( /^(in|out|inout)$/.test( qualifier ) ) {
|
||
|
|
|
||
|
|
i ++;
|
||
|
|
|
||
|
|
} else {
|
||
|
|
|
||
|
|
qualifier = null;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
const type = tokens[ i ++ ].str;
|
||
|
|
const name = tokens[ i ++ ].str;
|
||
|
|
|
||
|
|
params.push( new FunctionParameter( type, name, qualifier, immutable ) );
|
||
|
|
|
||
|
|
if ( tokens[ i ] && tokens[ i ].str !== ',' ) throw new Error( 'Expected ","' );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
return params;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
parseFunction() {
|
||
|
|
|
||
|
|
const type = this.readToken().str;
|
||
|
|
const name = this.readToken().str;
|
||
|
|
|
||
|
|
const paramsTokens = this.readTokensUntil( ')' );
|
||
|
|
|
||
|
|
const params = this.parseFunctionParams( paramsTokens.slice( 1, paramsTokens.length - 1 ) );
|
||
|
|
|
||
|
|
const func = new FunctionDeclaration( type, name, params );
|
||
|
|
|
||
|
|
this._currentFunction = func;
|
||
|
|
|
||
|
|
this.parseBlock( func );
|
||
|
|
|
||
|
|
this._currentFunction = null;
|
||
|
|
|
||
|
|
return func;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
parseVariablesFromToken( tokens, type ) {
|
||
|
|
|
||
|
|
let index = 0;
|
||
|
|
const immutable = tokens[ 0 ].str === 'const';
|
||
|
|
|
||
|
|
if ( immutable ) index ++;
|
||
|
|
|
||
|
|
type = type || tokens[ index ++ ].str;
|
||
|
|
const name = tokens[ index ++ ].str;
|
||
|
|
|
||
|
|
const token = tokens[ index ];
|
||
|
|
|
||
|
|
let init = null;
|
||
|
|
let next = null;
|
||
|
|
|
||
|
|
if ( token ) {
|
||
|
|
|
||
|
|
const initTokens = this.getTokensUntil( ',', tokens, index );
|
||
|
|
|
||
|
|
if ( initTokens[ 0 ].str === '=' ) {
|
||
|
|
|
||
|
|
const expressionTokens = initTokens.slice( 1 );
|
||
|
|
if ( expressionTokens[ expressionTokens.length - 1 ].str === ',' ) expressionTokens.pop();
|
||
|
|
|
||
|
|
init = this.parseExpressionFromTokens( expressionTokens );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
const nextTokens = tokens.slice( initTokens.length + ( index - 1 ) );
|
||
|
|
|
||
|
|
if ( nextTokens[ 0 ] && nextTokens[ 0 ].str === ',' ) {
|
||
|
|
|
||
|
|
next = this.parseVariablesFromToken( nextTokens.slice( 1 ), type );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
const variable = new VariableDeclaration( type, name, init, next, immutable );
|
||
|
|
|
||
|
|
return variable;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
parseVariables() {
|
||
|
|
|
||
|
|
const tokens = this.readTokensUntil( ';' );
|
||
|
|
|
||
|
|
return this.parseVariablesFromToken( tokens.slice( 0, tokens.length - 1 ) );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
parseUniform() {
|
||
|
|
|
||
|
|
const tokens = this.readTokensUntil( ';' );
|
||
|
|
|
||
|
|
const type = tokens[ 1 ].str;
|
||
|
|
const name = tokens[ 2 ].str;
|
||
|
|
|
||
|
|
return new Uniform( type, name );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
parseVarying() {
|
||
|
|
|
||
|
|
const tokens = this.readTokensUntil( ';' );
|
||
|
|
|
||
|
|
const type = tokens[ 1 ].str;
|
||
|
|
const name = tokens[ 2 ].str;
|
||
|
|
|
||
|
|
return new Varying( type, name );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
parseReturn() {
|
||
|
|
|
||
|
|
this.readToken(); // skip 'return'
|
||
|
|
|
||
|
|
const expression = this.parseExpression();
|
||
|
|
|
||
|
|
return new Return( expression );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
parseFor() {
|
||
|
|
|
||
|
|
this.readToken(); // skip 'for'
|
||
|
|
|
||
|
|
const forTokens = this.readTokensUntil( ')' ).slice( 1, - 1 );
|
||
|
|
|
||
|
|
const initializationTokens = this.getTokensUntil( ';', forTokens, 0 ).slice( 0, - 1 );
|
||
|
|
const conditionTokens = this.getTokensUntil( ';', forTokens, initializationTokens.length + 1 ).slice( 0, - 1 );
|
||
|
|
const afterthoughtTokens = forTokens.slice( initializationTokens.length + conditionTokens.length + 2 );
|
||
|
|
|
||
|
|
let initialization;
|
||
|
|
|
||
|
|
if ( initializationTokens[ 0 ] && isType( initializationTokens[ 0 ].str ) ) {
|
||
|
|
|
||
|
|
initialization = this.parseVariablesFromToken( initializationTokens );
|
||
|
|
|
||
|
|
} else {
|
||
|
|
|
||
|
|
initialization = this.parseExpressionFromTokens( initializationTokens );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
const condition = this.parseExpressionFromTokens( conditionTokens );
|
||
|
|
const afterthought = this.parseExpressionFromTokens( afterthoughtTokens );
|
||
|
|
|
||
|
|
const statement = new For( initialization, condition, afterthought );
|
||
|
|
|
||
|
|
if ( this.getToken().str === '{' ) {
|
||
|
|
|
||
|
|
this.parseBlock( statement );
|
||
|
|
|
||
|
|
} else {
|
||
|
|
|
||
|
|
statement.body.push( this.parseExpression() );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
return statement;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
parseIf() {
|
||
|
|
|
||
|
|
const parseIfExpression = () => {
|
||
|
|
|
||
|
|
this.readToken(); // skip 'if'
|
||
|
|
|
||
|
|
const condTokens = this.readTokensUntil( ')' );
|
||
|
|
|
||
|
|
return this.parseExpressionFromTokens( condTokens.slice( 1, condTokens.length - 1 ) );
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
const parseIfBlock = ( cond ) => {
|
||
|
|
|
||
|
|
if ( this.getToken().str === '{' ) {
|
||
|
|
|
||
|
|
this.parseBlock( cond );
|
||
|
|
|
||
|
|
} else {
|
||
|
|
|
||
|
|
cond.body.push( this.parseExpression() );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
//
|
||
|
|
|
||
|
|
const conditional = new Conditional( parseIfExpression() );
|
||
|
|
|
||
|
|
parseIfBlock( conditional );
|
||
|
|
|
||
|
|
//
|
||
|
|
|
||
|
|
let current = conditional;
|
||
|
|
|
||
|
|
while ( this.getToken() && this.getToken().str === 'else' ) {
|
||
|
|
|
||
|
|
this.readToken(); // skip 'else'
|
||
|
|
|
||
|
|
const previous = current;
|
||
|
|
|
||
|
|
if ( this.getToken().str === 'if' ) {
|
||
|
|
|
||
|
|
current = new Conditional( parseIfExpression() );
|
||
|
|
|
||
|
|
} else {
|
||
|
|
|
||
|
|
current = new Conditional();
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
previous.elseConditional = current;
|
||
|
|
|
||
|
|
parseIfBlock( current );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
return conditional;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
parseBlock( scope ) {
|
||
|
|
|
||
|
|
const firstToken = this.getToken();
|
||
|
|
|
||
|
|
if ( firstToken.str === '{' ) {
|
||
|
|
|
||
|
|
this.readToken(); // skip '{'
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
let groupIndex = 0;
|
||
|
|
|
||
|
|
while ( this.index < this.tokens.length ) {
|
||
|
|
|
||
|
|
const token = this.getToken();
|
||
|
|
|
||
|
|
let statement = null;
|
||
|
|
|
||
|
|
groupIndex += getGroupDelta( token.str );
|
||
|
|
|
||
|
|
if ( groupIndex < 0 ) {
|
||
|
|
|
||
|
|
this.readToken(); // skip '}'
|
||
|
|
|
||
|
|
break;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
//
|
||
|
|
|
||
|
|
if ( token.isLiteral ) {
|
||
|
|
|
||
|
|
if ( token.str === 'const' ) {
|
||
|
|
|
||
|
|
statement = this.parseVariables();
|
||
|
|
|
||
|
|
} else if ( token.str === 'uniform' ) {
|
||
|
|
|
||
|
|
statement = this.parseUniform();
|
||
|
|
|
||
|
|
} else if ( token.str === 'varying' ) {
|
||
|
|
|
||
|
|
statement = this.parseVarying();
|
||
|
|
|
||
|
|
} else if ( isType( token.str ) ) {
|
||
|
|
|
||
|
|
if ( this.getToken( 2 ).str === '(' ) {
|
||
|
|
|
||
|
|
statement = this.parseFunction();
|
||
|
|
|
||
|
|
} else {
|
||
|
|
|
||
|
|
statement = this.parseVariables();
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
} else if ( token.str === 'return' ) {
|
||
|
|
|
||
|
|
statement = this.parseReturn();
|
||
|
|
|
||
|
|
} else if ( token.str === 'if' ) {
|
||
|
|
|
||
|
|
statement = this.parseIf();
|
||
|
|
|
||
|
|
} else if ( token.str === 'for' ) {
|
||
|
|
|
||
|
|
statement = this.parseFor();
|
||
|
|
|
||
|
|
} else {
|
||
|
|
|
||
|
|
statement = this.parseExpression();
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( statement ) {
|
||
|
|
|
||
|
|
scope.body.push( statement );
|
||
|
|
|
||
|
|
} else {
|
||
|
|
|
||
|
|
this.index ++;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
_evalOperator( operator ) {
|
||
|
|
|
||
|
|
if ( operator.type.includes( '=' ) ) {
|
||
|
|
|
||
|
|
const parameter = this._getFunctionParameter( operator.left.property );
|
||
|
|
|
||
|
|
if ( parameter !== undefined ) {
|
||
|
|
|
||
|
|
// Parameters are immutable in WGSL
|
||
|
|
|
||
|
|
parameter.immutable = false;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
return operator;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
_getFunctionParameter( name ) {
|
||
|
|
|
||
|
|
if ( this._currentFunction ) {
|
||
|
|
|
||
|
|
for ( const param of this._currentFunction.params ) {
|
||
|
|
|
||
|
|
if ( param.name === name ) {
|
||
|
|
|
||
|
|
return param;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
parse( source ) {
|
||
|
|
|
||
|
|
let polyfill = '';
|
||
|
|
|
||
|
|
for ( const keyword of this.keywords ) {
|
||
|
|
|
||
|
|
if ( new RegExp( `(^|\\b)${ keyword.name }($|\\b)`, 'gm' ).test( source ) ) {
|
||
|
|
|
||
|
|
polyfill += keyword.polyfill + '\n';
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( polyfill ) {
|
||
|
|
|
||
|
|
polyfill = '// Polyfills\n\n' + polyfill + '\n';
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
this.index = 0;
|
||
|
|
this.tokenizer = new Tokenizer( polyfill + source ).tokenize();
|
||
|
|
|
||
|
|
const program = new Program();
|
||
|
|
|
||
|
|
this.parseBlock( program );
|
||
|
|
|
||
|
|
return program;
|
||
|
|
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
export default GLSLDecoder;
|