@equantic/linq/filtering/FilteringParser.js

eQuantic Linq for JavaScript

import { flatten } from 'flat';
import { Filtering } from './Filtering.js';
import { FilteringCollection } from './FilteringCollection.js';
import { OrFiltering } from './OrFiltering.js';
import { CompositeFiltering } from './CompositeFiltering.js';
import { parseExpression } from './base.js';
import { CompositeFilteringParser } from './CompositeFilteringParser.js';
export class FilteringParser {
    static parseQueryString(queryFilter) {
        const result = new FilteringCollection();
        if (!queryFilter)
            return result;
        if (!Array.isArray(queryFilter))
            queryFilter = [queryFilter.toString()];
        for (const k in queryFilter) {
            if (!k)
                continue;
            const f = queryFilter[k];
            const exp = f.toString();
            if (CompositeFilteringParser.parse(exp, result))
                continue;
            FilteringParser.parseExpression(exp, result);
        }
        return result;
    }
    static parseObject(data, options) {
        const collection = new FilteringCollection();
        if (!data)
            return collection;
        const flattenObj = flatten(data, { safe: true });
        for (const key in flattenObj) {
            if (!key)
                continue;
            let value = flattenObj[key];
            const info = options?.parseProperty(key) || {
                column: key,
                operator: 'eq',
            };
            if (Array.isArray(value)) {
                if (value.length > 1) {
                    const composite = new OrFiltering();
                    for (const idx in value) {
                        if (FilteringParser.validateValue(value[idx], options))
                            composite.addValue(new Filtering(info.column, value[idx], info.operator));
                    }
                    collection.push(composite);
                    continue;
                }
                value = value[0];
            }
            if (FilteringParser.validateValue(value, options))
                collection.push(new Filtering(info.column, value, info.operator));
        }
        return collection;
    }
    static parse(source, options) {
        if (source instanceof CompositeFiltering) {
            return new CompositeFiltering(source.compositeOperator, source.values.map((value) => FilteringParser.parse(value)));
        }
        const columnName = options?.parseProperty(source.column) || source.column;
        return new Filtering(columnName, source.value, source.operator);
    }
    static parseCollection(source, options) {
        return new FilteringCollection(source.map((s) => FilteringParser.parse(s, options)));
    }
    static parseExpression(exp, result) {
        const f = parseExpression(exp);
        const filtering = new Filtering(f.column, f.value, f.operator);
        result.push(filtering);
    }
    static toQueryString(filtering) {
        if (!filtering || filtering.length === 0)
            return undefined;
        const newFiltering = FilteringParser.parseCollection(new FilteringCollection(filtering));
        return newFiltering.length > 1
            ? new CompositeFiltering('and', newFiltering).toString()
            : newFiltering[0].toString();
    }
    static validateValue(value, options) {
        if (value == null)
            return options?.consideringNullValues ? true : false;
        if (value == '')
            return options?.consideringEmptyValues ? true : false;
        return true;
    }
}