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slice&dice.js
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slice&dice.js
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// ****** This file contains all 'where' clause operations ****** //
const fs = require('fs');
const msgpack = require('msgpack-lite');
const chalk = require('chalk');
const lodash = require('lodash');
const cfn = require('./common-functions');
const docfn = require('./doc-functions');
//simple where clause (Compare single property with single value)
function whereClause(docname, prop, operator, val, callback) {
let msg;
let output;
let p = `${process.env.LAZLO_SOURCE}/${db}/${docname}.laz`;
if (db !== null && fs.existsSync(p)) {
if (cache.length !== 0 && current_doc === docname) {
//fast retrieval using cache
if(!docfn.propExists(prop)) {
msg = 'Property does not exist in any record !';
if (callback)
callback((chalk.red.bold(msg)));
}
else {
output = cfn.whereComp(prop, operator, val);
if (output !== null) {
if (callback)
callback(output)
} else {
msg = 'Operator not recognized !';
if (callback)
callback((chalk.red.bold(msg)));
}
}
} else {
//normal retrieval
if (fs.statSync(p).size !== 0) {
fs.readFile(p, (err, data) => {
if (err) {
msg = 'Data seems to be corrupted !';
if (callback)
callback((chalk.red.bold(msg)));
} else {
cache = msgpack.decode(data);
current_doc = docname;
if(!docfn.propExists(prop)) {
msg = 'Property does not exist in any record !';
if (callback)
callback((chalk.red.bold(msg)));
}
else {
output = cfn.whereComp(prop, operator, val);
if (output !== null) {
if (callback)
callback(output)
} else {
msg = 'Operator not recognized !';
if (callback)
callback((chalk.red.bold(msg)));
}
}
}
});
} else {
msg = 'Document is empty !';
if (callback)
callback((chalk.red.bold(msg)));
}
}
} else {
msg = 'No database selected or the document does not exist !';
if (callback)
callback((chalk.red.bold(msg)));
}
}
module.exports.whereClause = whereClause;
//adv where clause (Compare dual properties with dual values)
function whereClause2(docname, prop1, operator1, val1, conjunction, prop2, operator2, val2, callback) {
let msg;
let output1;
let output2;
let p = `${process.env.LAZLO_SOURCE}/${db}/${docname}.laz`;
if (db !== null && fs.existsSync(p)) {
if (cache.length !== 0 && current_doc === docname) {
//fast retrieval using cache
if(!docfn.propExists(prop1) || !docfn.propExists(prop2)) {
msg = 'One or more properties do not exist in any record !';
if (callback)
callback((chalk.red.bold(msg)));
}
else {
output1 = cfn.whereComp(prop1, operator1, val1);
output2 = cfn.whereComp(prop2, operator2, val2);
if(output1 === null || output2 === null) {
msg = 'Operator not recognized !';
if (callback)
callback((chalk.red.bold(msg)));
} else {
if(conjunction === 'and') {
let result = lodash.intersection(output1,output2);
if(callback)
callback(result)
}
else if(conjunction === 'or') {
let result = lodash.union(output1,output2);
if(callback)
callback(result)
}
else {
msg = 'Conjunction not recognized !';
if (callback)
callback((chalk.red.bold(msg)));
}
}
}
} else {
//normal retrieval
if (fs.statSync(p).size !== 0) {
fs.readFile(p, (err, data) => {
if (err) {
msg = 'Data seems to be corrupted !';
if (callback)
callback((chalk.red.bold(msg)));
} else {
cache = msgpack.decode(data);
current_doc = docname;
if (!docfn.propExists(prop1) || !docfn.propExists(prop2)) {
msg = 'One or more properties do not exist in any record !';
if (callback)
callback((chalk.red.bold(msg)));
} else {
output1 = cfn.whereComp(prop1, operator1, val1);
output2 = cfn.whereComp(prop2, operator2, val2);
if (output1 === null || output2 === null) {
msg = 'Operator not recognized !';
if (callback)
callback((chalk.red.bold(msg)));
} else {
if (conjunction === 'and') {
let result = lodash.intersection(output1, output2);
if (callback)
callback(result)
} else if (conjunction === 'or') {
let result = lodash.union(output1, output2);
if (callback)
callback(result)
} else {
msg = 'Conjunction not recognized !';
if (callback)
callback((chalk.red.bold(msg)));
}
}
}
}
});
} else {
msg = 'Document is empty !';
if (callback)
callback((chalk.red.bold(msg)));
}
}
} else {
msg = 'No database selected or the document does not exist !';
if (callback)
callback((chalk.red.bold(msg)));
}
}
module.exports.whereClause2 = whereClause2;
// compare properties in a record
function propWhere(docname, prop1, operator, prop2, callback) {
let msg;
let output;
let p = `${process.env.LAZLO_SOURCE}/${db}/${docname}.laz`;
if (db !== null && fs.existsSync(p)) {
if (cache.length !== 0 && current_doc === docname) {
//fast retrieval using cache
if(!docfn.propExists(prop1) || !docfn.propExists(prop2)) {
msg = 'One or more properties do not exist in any record !';
if (callback)
callback((chalk.red.bold(msg)));
}
else {
output = cfn.propComp(prop1, operator, prop2);
if (output !== null) {
if (callback)
callback(output)
} else {
msg = 'Operator not recognized !';
if (callback)
callback((chalk.red.bold(msg)));
}
}
} else {
//normal retrieval
if (fs.statSync(p).size !== 0) {
fs.readFile(p, (err, data) => {
if (err) {
msg = 'Data seems to be corrupted !';
if (callback)
callback((chalk.red.bold(msg)));
} else {
cache = msgpack.decode(data);
current_doc = docname;
if (!docfn.propExists(prop1) || !docfn.propExists(prop2)) {
msg = 'One or more properties do not exist in any record !';
if (callback)
callback((chalk.red.bold(msg)));
} else {
output = cfn.propComp(prop1, operator, prop2);
if (output !== null) {
if (callback)
callback(output)
} else {
msg = 'Operator not recognized !';
if (callback)
callback((chalk.red.bold(msg)));
}
}
}
});
} else {
msg = 'Document is empty !';
if (callback)
callback((chalk.red.bold(msg)));
}
}
} else {
msg = 'No database selected or the document does not exist !';
if (callback)
callback((chalk.red.bold(msg)));
}
}
module.exports.propWhere = propWhere;