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VariableShapeTracker.js
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VariableShapeTracker.js
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import { UNKNOWN_ASSIGNMENT } from '../values';
const SET_KEY = { type: 'SET_KEY' };
export const UNKNOWN_KEY = { type: 'UNKNOWN_KEY' };
const UNKNOWN_ASSIGNMENTS = new Map( [ [ SET_KEY, new Set( [ UNKNOWN_ASSIGNMENT ] ) ] ] );
export default class VariableShapeTracker {
constructor () {
this._assignments = new Map( [ [ SET_KEY, new Set() ] ] );
}
addAtPath ( path, assignment ) {
if ( this._assignments === UNKNOWN_ASSIGNMENTS ) return;
if ( path.length === 0 ) {
if ( assignment === UNKNOWN_ASSIGNMENT ) {
this._assignments = UNKNOWN_ASSIGNMENTS;
} else {
this._assignments.get( SET_KEY ).add( assignment );
}
} else {
const [ nextPath, ...remainingPath ] = path;
if ( !this._assignments.has( nextPath ) ) {
this._assignments.set( nextPath, new VariableShapeTracker() );
}
this._assignments.get( nextPath ).addAtPath( remainingPath, assignment );
}
}
forEachAtPath ( path, callback ) {
const [ nextPath, ...remainingPath ] = path;
this._assignments.get( SET_KEY ).forEach( assignment => callback( path, assignment ) );
if ( path.length > 0 ) {
if ( nextPath === UNKNOWN_KEY ) {
this._assignments.forEach( ( assignment, subPath ) => {
if ( subPath !== SET_KEY ) {
assignment.forEachAtPath( remainingPath, callback );
}
} );
} else {
if ( this._assignments.has( nextPath ) ) {
this._assignments.get( nextPath ).forEachAtPath( remainingPath, callback );
}
if ( this._assignments.has( UNKNOWN_KEY ) ) {
this._assignments.get( UNKNOWN_KEY ).forEachAtPath( remainingPath, callback );
}
}
}
}
forEachAssignedToPath ( path, callback ) {
if ( path.length > 0 ) {
const [ nextPath, ...remainingPath ] = path;
if ( this._assignments.has( nextPath ) ) {
this._assignments.get( nextPath ).forEachAssignedToPath( remainingPath, callback );
}
} else {
this._assignments.forEach( ( assignment, subPath ) => {
if ( subPath === SET_KEY ) {
assignment.forEach( subAssignment => callback( [], subAssignment ) );
} else {
assignment.forEachAssignedToPath( [],
( relativePath, assignment ) => callback( [ subPath, ...relativePath ], assignment ) );
}
} );
}
}
hasAtPath ( path, assignment ) {
if ( this._assignments === UNKNOWN_ASSIGNMENTS ) return true;
if ( path.length === 0 ) {
return this._assignments.get( SET_KEY ).has( assignment );
} else {
const [ nextPath, ...remainingPath ] = path;
if ( !this._assignments.has( nextPath ) ) {
return false;
}
return this._assignments.get( nextPath ).hasAtPath( remainingPath, assignment );
}
}
someAtPath ( path, predicateFunction ) {
const [ nextPath, ...remainingPath ] = path;
return Array.from( this._assignments.get( SET_KEY ) ).some( assignment => predicateFunction( path, assignment ) )
|| (
path.length > 0
&& (
(nextPath === UNKNOWN_KEY
&& Array.from( this._assignments ).some( ( [ subPath, assignment ] ) => {
if ( subPath !== SET_KEY ) {
return assignment.someAtPath( remainingPath, predicateFunction );
}
} ))
|| (nextPath !== UNKNOWN_KEY
&& (
(this._assignments.has( nextPath )
&& this._assignments.get( nextPath ).someAtPath( remainingPath, predicateFunction ))
|| (this._assignments.has( UNKNOWN_KEY )
&& this._assignments.get( UNKNOWN_KEY ).someAtPath( remainingPath, predicateFunction ))
))
)
);
}
// For debugging purposes
toString ( pathString = '' ) {
return Array.from( this._assignments ).map( ( [ subPath, subAssignment ] ) => subPath === SET_KEY
? Array.from( subAssignment ).map( assignment => pathString + assignment.toString() ).join( '\n' )
: subAssignment.toString( pathString + subPath + ': ' ) ).join( '\n' );
}
}