All files / src/utils sExpression.ts

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import fnName from "./fnName";
import clauseFromAlts from "./clauseFromAlts";
 
import { wall, any, zeroOrMore, and, cat, or, ExprClause, mapOf, maybe } from  '../core';
import delayed from './delayed';
import match from './match';
import coerceIntoClause from './coerceIntoClause';
import { isStr, isPlainObj, instanceOf } from  '../preds';
 
export class Recursive {
  constructor (expression) {
    this.isRecursive = true;
    this.expression = expression;
  };
  isRecursive: Boolean;
  expression: any;
}
 
export function QuotedParamsMap( map? ) {
  Object.assign( this, map );
}
 
export function UnquotedParamsMap( map? ) {
  Object.assign( this, map );
}
 
function Quoted( val ) {
  this.value = val;
}
 
var ParamLabelClause = or( 'str', isStr, 'quoted', instanceOf( Quoted ) );
 
export function genClauses( headClause ) {
  var paramItemC = or(
    'sExpression', delayed( () => sExprC ),
    'quotedParamsMap', delayed( () => QuotedParamsMapC ),
    'unquotedParamsMap', delayed( () => UnquotedParamsMapC ),
    'optionsObj', isPlainObj,
    'recursive', instanceOf( Recursive )
  );
  var sExprC = wall(
    cat(
      'head', headClause,
      'params', or(
        'labelled', zeroOrMore( cat(
          'label', ParamLabelClause,
    I      'item', delayed( () => paramItemC ) ) ),
        'unlabelled', zeroOrMore( cat(
          'item', delayed( () => paramItemC )
        ) )
      )
    )
  );
  const ParamsMapC = mapOf(
    any,
    maybe( or(
      'keyList', zeroOrMore( delayed( () => ParamLabelClause ) ),
      'singleParam', delayed( () => paramItemC )
    ) )
  );
 
  var QuotedParamsMapC = and(
    instanceOf( QuotedParamsMap ),
    delayed( () => ParamsMapC )
  );
 
  var UnquotedParamsMapC = and(
    instanceOf( UnquotedParamsMap ),
    delayed( () => ParamsMapC )
  );

  return [ sExprC, paramItemC ];
}
 
export const [ SExpressionClause, ParamItemClause ] =
  genClauses( ExprClause );
 
var singleArgParamGenerator = ( repo, { opts: { enclosedClause } } ) =>
  [ _createSExpr( repo, enclosedClause ) ];
 
var multipleArgParamGenerator = ( repo, { opts: { named }, exprs } ) => {
  if ( exprs.length === 0 ) {
  //empty case
    return [];
  } else if ( named ) {
    const r = exprs.reduce(
      ( acc, { name, expr } ) =>
        acc.concat( [ new Quoted( name ), _createSExpr( repo, expr ) ] )
        , [] );
    return r;
  } else {
    return exprs.reduce(
      ( acc, { expr } ) => acc.concat( [ _createSExpr( repo, expr ) ] ),
      [] );
  }
};
 
var sParamsConverters = {
  'PRED': ( ) => [ ],
  'WALL': ( repo, { opts: { enclosedClause } } ) => [ _createSExpr( repo, enclosedClause ) ],
  'AND': ( repo, { opts: { conformedExprs } } ) =>
    conformedExprs.map( clauseFromAlts ).map( ( c ) => _createSExpr( repo, c ) ),
  'CAT': multipleArgParamGenerator,
  'OR': multipleArgParamGenerator,
  'Z_OR_M': singleArgParamGenerator,
  'O_OR_M': singleArgParamGenerator,
  'Z_OR_O': singleArgParamGenerator,
  'COLL_OF': singleArgParamGenerator,
  'ANY': () => [],
  'MAP_OF': ( repo, { opts } ) => _handleKeyValExprPair( repo, opts ),
  'SHAPE': ( repo, { 
    opts: { 
      conformedArgs: { 
        shapeArgs: { 
          optionalFields: { opt = null, optional = null } = {}, 
          requiredFields: { req = null, required = null } = {} 
        } 
      } 
    } 
  } ) =>
    Object.assign( new UnquotedParamsMap(),
      ( req || required ) ? {
        required: _fieldDefToFrags( repo, req || required ),
      } : {},
      ( opt || optional ) ? {
        optional: _fieldDefToFrags( repo, opt || optional ),
      } : {}
    ),
  'FCLAUSE': ( repo, { opts: { args, ret, fn } } ) =>
    Object.assign( new UnquotedParamsMap(),
    args ? { args: _createSExpr( repo, args ) } : {},
    ret ? { ret: _createSExpr( repo, ret ) } : {},
    fn ? { fn: [ `${fnName( fn )}()` ] } : {} )
}
I
function _fieldDefToFrags( repo, { fieldDefs, keyList } ) {
  if ( fieldDefs ) {
    let r = new QuotedParamsMap();
    for ( let key in fieldDefs ) {
      if ( fieldDefs.hasOwnProperty( key ) ) {
        let val = match( fieldDefs[ key ], {
          'keyValExprPair': ( pair ) => _handleKeyValExprPair( repo, pair ),
          'valExpressionOnly': ( expr ) => _createSExpr( repo, clauseFromAlts( expr ) )
        }, () => {
    I      throw '!g';
        } );
        Object.assign( r, {
          [ key ]: val
    I    } );
      }
    }
    return r;
  } else if ( keyList ) {
    return keyList;
  } else {
    throw '!w';
  }
}
 
function _handleKeyValExprPair( repo, { keyExpression, valExpression } ) {
  return new UnquotedParamsMap( {
    E'key': _createSExpr( repo, clauseFromAlts( keyExpression ) ),
    'val': _createSExpr( repo, clauseFromAlts( valExpression ) ),
  } );
}
 
function _params( repo, clause ) {
  const converter = sParamsConverters[ clause.type ];
  if ( !converter ) {
    console.error( clause );
    throw new Error( `Unsupported clause type ${clause.type}.` );
  } else {
    const r = converter( repo, clause );
    return r;
  }
}
 
function _createSExpr( repo, expr ) {
  if ( _exists( repo, expr ) ) {
    return new Recursive( expr );
  }
  let coercedExpr = coerceIntoClause( expr ),
    realExpr,
    newRepo = repo;
  if ( coercedExpr.type === 'DELAYED' ||
     coercedExpr.type === 'CLAUSE_REF' ) {
    realExpr = coercedExpr.get();
    return _createSExpr( repo, realExpr );
  } else {
    realExpr = coercedExpr;
    newRepo = _addToRepo( repo, coercedExpr );
  }
  var params = _params( newRepo, realExpr );
  return [ realExpr ].concat( params );
}
 
 
function _addToRepo( repo, expr ) {
  if ( !_exists( repo, expr ) ) {
    return repo.concat( [ expr ] );
  }
}
 
function _exists( repo, piece ) {
  return repo.indexOf( piece ) >= 0;
}
 
function sExpression( expr ) {
  const repo = [];
  return _createSExpr( repo, expr );
}
 
export default sExpression;