All files / src/utils QueryHelper.ts

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84.62% Branches 33/39
100% Functions 8/8
100% Lines 88/88

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import { forIn } from "lodash";
import { CharGenerator } from "./CharGenerator";
 
const singlePredicates = {
  $sw: "STARTS WITH",
  $ew: "ENDS WITH",
  $contains: "CONTAINS",
  $reg: "=~",
 
  $eq: "=",
  $in: "IN",
 
  $gt: ">",
  $gte: ">=",
  $lt: "<",
  $lte: "<=",
};
 
function _prepareWhere(
  props: any,
  variable: string
): { where: string[]; flatProps: any } {
  const where = [];
  let flatProps = {};
 
  if (!props) {
    return { where: [], flatProps: {} };
  }
 
  forIn(props, (v, k) => {
    const propChar = CharGenerator.next();
    let found = false;
 
    if (v.$or) {
      found = true;
      const whereOr = [];
      for (const predicate of v.$or) {
        const tmp = _prepareWhere({ [k]: predicate }, variable);
        whereOr.push(...tmp.where);
        flatProps = { ...flatProps, ...tmp.flatProps };
      }
      where.push(`(${whereOr.join(" OR ")})`);
    } else if (v.$and) {
      found = true;
      const whereAnd = [];
      for (const predicate of v.$and) {
        const tmp = _prepareWhere({ [k]: predicate }, variable);
        whereAnd.push(...tmp.where);
        flatProps = { ...flatProps, ...tmp.flatProps };
      }
      where.push(`(${whereAnd.join(" AND ")})`);
    } else if (v.$not) {
      found = true;
      const tmp = _prepareWhere({ [k]: v.$not }, variable);
      Eif (tmp.where.length) {
        where.push(`NOT ${tmp.where[0]}`);
        flatProps = { ...flatProps, ...tmp.flatProps };
      }
    } else if (v.$between) {
      found = true;
      Eif (v.$between.length === 2) {
        const [num1, num2] = v.$between;
        const a = propChar;
        const b = CharGenerator.next();
        where.push(`{${a}} <= ${variable}.${k} <= {${b}}`);
        flatProps[a] = num1 > num2 ? num2 : num1;
        flatProps[b] = num1 > num2 ? num1 : num2;
      }
    } else {
      forIn(singlePredicates, (predicateString, predicateKey) => {
        const val = v[predicateKey];
        if (val || typeof val === "number" || typeof val === "string") {
          found = true;
          where.push(`${variable}.${k} ${predicateString} {${propChar}}`);
          flatProps[propChar] = v[predicateKey];
        }
      });
    }
 
    if (!found) {
      where.push(`${variable}.${k} = {${propChar}}`);
      flatProps[propChar] = v;
    }
  });
 
  return { where, flatProps };
}
 
export function prepareWhere(
  properties: any,
  variables: string | string[]
): { where: string; flatProps: any } {
  CharGenerator.start("a");
  let vars: string[] = [];
  let props: any = {};
  if (typeof variables === "string") {
    vars = [variables];
    props[variables] = properties;
  } else Eif (Array.isArray(variables)) {
    vars = variables;
    props = properties;
  }
 
  let where = [];
  let flatProps = {};
  vars.forEach(variable => {
    const result = _prepareWhere(props[variable], variable);
    where = where.concat(result.where);
    Object.assign(flatProps, result.flatProps);
  });
 
  if (where.length === 0) {
    return { where: "", flatProps: undefined };
  }
 
  return { where: "WHERE " + where.join(" AND "), flatProps };
}
 
export function prepareSet(
  properties: any,
  variables: string | string[]
): { str: string; newProps: any } {
  const sets = [];
  const newProps: any = {};
  let vars: string[] = [];
  let props: any = {};
  if (typeof variables === "string") {
    vars = [variables];
    props[variables] = properties;
  } else Eif (Array.isArray(variables)) {
    vars = variables;
    props = properties;
  }
 
  vars.forEach(variable => {
    forIn(props[variable], (v, k) => {
      Iif (k === "guid") return null;
      sets.push(`${variable}.${k}={_u_${variable}_${k}}`);
      newProps[`_u_${variable}_${k}`] = v;
    });
  });
 
  Iif (!sets.length) throw new Error(`Nothing to update`);
 
  return { str: sets.join(", "), newProps };
}