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Materialized query parser + data indexing and querying

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This commit is contained in:
Zef Hemel
2022-04-12 13:33:07 +02:00
parent b3c3302970
commit a24eaaf4b4
16 changed files with 249 additions and 133 deletions
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plugs/query/engine.ts
+17 -13
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@@ -31,6 +31,8 @@ export function parseQuery(query: string): ParsedQuery {
}
});
// console.log("Parsed", JSON.stringify(n, null, 2));
let queryNode = n.children![0];
let parsedQuery: ParsedQuery = {
table: queryNode.children![0].children![0].text!,
@@ -64,6 +66,10 @@ export function parseQuery(query: string): ParsedQuery {
case "Name":
val = valNode.children![0].text!;
break;
case "Regex":
val = valNode.children![0].text!;
val = new RegExp(val.substring(1, val.length - 1));
break;
case "String":
val = valNode.children![0].text!;
val = val.substring(1, val.length - 1);
@@ -80,55 +86,53 @@ export function parseQuery(query: string): ParsedQuery {
return parsedQuery;
}
export function applyQuery(query: string, records: any[]): any {
const parsedQuery = parseQuery(query);
export function applyQuery<T>(parsedQuery: ParsedQuery, records: T[]): T[] {
let resultRecords: any[] = [];
if (parsedQuery.filter.length === 0) {
resultRecords = records.slice();
} else {
recordLoop: for (let record of records) {
const recordAny: any = record;
for (let { op, prop, value } of parsedQuery.filter) {
switch (op) {
case "=":
if (!(record[prop] === value)) {
if (!(recordAny[prop] === value)) {
continue recordLoop;
}
break;
case "!=":
if (!(record[prop] !== value)) {
if (!(recordAny[prop] !== value)) {
continue recordLoop;
}
break;
case "<":
if (!(record[prop] < value)) {
if (!(recordAny[prop] < value)) {
continue recordLoop;
}
break;
case "<=":
if (!(record[prop] <= value)) {
if (!(recordAny[prop] <= value)) {
continue recordLoop;
}
break;
case ">":
if (!(record[prop] > value)) {
if (!(recordAny[prop] > value)) {
continue recordLoop;
}
break;
case ">=":
if (!(record[prop] >= value)) {
if (!(recordAny[prop] >= value)) {
continue recordLoop;
}
break;
case "like":
let re = new RegExp(value.replaceAll("%", ".*"));
if (!re.exec(record[prop])) {
case "=~":
if (!value.exec(recordAny[prop])) {
continue recordLoop;
}
break;
}
}
resultRecords.push(record);
resultRecords.push(recordAny);
}
}
// Now the sorting