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HMatcher.js
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HMatcher.js
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/*
* Copyright 2019 Igor Kim
* This file is part of Smart Shopping List Web.
*
* Smart Shopping List Web is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
* Smart Shopping List Web is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Smart Shopping List Web. If not, see <https://www.gnu.org/licenses/>.
*/
import fuzz from "fuzzball";
import HStrings from "./HStrings";
import quantityTypes from "../Datasets/quantity_types.json";
import products from "../Datasets/products.json";
const fuzzOptions = { cutoff: 80, scorer: fuzz.ratio };
// Searches for a product in a dataset using Fuzzy search
function matchProduct(val, reverse = false, customProducts = null) {
let useProducts = products;
if (customProducts) {
useProducts = customProducts;
}
// Split string to words
let parts = val.split(" ");
if (reverse) {
parts.reverse();
}
let desc = "";
let found = false;
for (let i = 0; i < parts.length; i++) {
const part = HStrings.sliceJoin(parts, i);
if (part.length === 0) {
continue;
}
const results = fuzz.extract(part, Object.keys(useProducts), fuzzOptions);
// If fuzzy search returned at least one result
if (results.length > 0) {
found = true;
val = results[0][0];
// Combine words
desc = HStrings.sliceJoin(parts, 0, i);
// Restore words order if reversed search requested
if (reverse) {
desc = desc.split(" ").reverse().join(" ");
}
// TODO: return all results as suggestions
break;
}
}
if (found) {
val = checkProductSynonym(val, useProducts);
}
return {
found,
val,
desc
};
}
// Searches for a quantity part
function matchQuantity(val) {
const re = /((\d+)\s{0,}([a-zA-Z]*))(?:\s|$)/gm;
let match;
while ((match = re.exec(val)) != null) {
if (match[3].length === 0) {
continue;
}
const results = fuzz.extract(match[3], Object.keys(quantityTypes), fuzzOptions);
if (results.length > 0) {
const quantity = match[2];
const quantityType = results[0][0];
const product = HStrings.substringParts(val, match.index, match.index + match[1].length + 1);
return {
quantity, quantityType, product
};
} else {
return {
quantity: match[2],
quantityType: null,
product: HStrings.substringParts(val, match.index, match.index + match[2].length + 1)
};
}
}
return null;
}
// Performs input string parsing
function parseProduct(inputValue, customProducts = null) {
let useProducts = products;
if (customProducts) {
useProducts = customProducts;
}
let val = HStrings.removeExtraWhitespaces(inputValue);
val = HStrings.removePrepositions(val.split(" "));
let quantity;
let quantityType;
let resQuantity = matchQuantity(val);
if (resQuantity) {
quantity = parseInt(resQuantity.quantity);
quantityType = resQuantity.quantityType;
val = resQuantity.product;
}
let resProduct = matchProduct(val);
if (!resProduct.found) {
resProduct = matchProduct(val, true);
}
let productTitle = resProduct.val;
if (resProduct.found) {
productTitle = useProducts[resProduct.val].title;
if (!quantityType) {
quantityType = useProducts[resProduct.val].defaultMetric;
}
if (!quantity) {
quantity = parseInt(useProducts[resProduct.val].defaultQuantity);
}
}
return {
added: false,
fullText: inputValue,
quantity,
quantityType: getRootQuantityType(quantityType),
productTitle,
productID: resProduct.val,
productDesc: resProduct.desc
};
}
// Recursively does a synonym search of objectID in dataset
function synonymSearch(objectID, dataset) {
if (!dataset.hasOwnProperty(objectID)) {
return objectID;
}
let productObj = dataset[objectID];
if (productObj.hasOwnProperty("ref") && productObj.hasOwnProperty("refType") && productObj["refType"] === "synonym") {
return checkProductSynonym(productObj["ref"], dataset);
}
return objectID;
}
// Recursively checks if productd productID is a synonym and returns a original productID if yes
function checkProductSynonym(productID, useProducts) {
return synonymSearch(productID, useProducts);
}
// Recursively checks if productd quantityTypeID is a synonym and returns a original quantityTypeID if yes
function getRootQuantityType(quantityTypeID) {
return synonymSearch(quantityTypeID, quantityTypes);
}
const HMatcher = {
matchProduct,
matchQuantity,
parseProduct,
getRootQuantityType
};
export default HMatcher;