97 lines
2.7 KiB
TypeScript
97 lines
2.7 KiB
TypeScript
import {
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collectNodesOfType,
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findNodeOfType,
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replaceNodesMatching,
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} from "../../common/tree.ts";
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import { lezerToParseTree } from "../../common/parse_tree.ts";
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import { valueNodeToVal } from "./engine.ts";
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// @ts-ignore auto generated
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import { parser } from "./parse-query.js";
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export type Filter = {
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op: string;
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prop: string;
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value: any;
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};
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export type ParsedQuery = {
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table: string;
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orderBy?: string;
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orderDesc?: boolean;
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limit?: number;
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filter: Filter[];
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select?: string[];
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render?: string;
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};
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export function parseQuery(query: string): ParsedQuery {
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let n = lezerToParseTree(query, parser.parse(query).topNode);
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// Clean the tree a bit
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replaceNodesMatching(n, (n) => {
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if (!n.type) {
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let trimmed = n.text!.trim();
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if (!trimmed) {
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return null;
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}
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n.text = trimmed;
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}
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});
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// console.log("Parsed", JSON.stringify(n, null, 2));
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let queryNode = n.children![0];
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let parsedQuery: ParsedQuery = {
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table: queryNode.children![0].children![0].text!,
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filter: [],
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};
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let orderByNode = findNodeOfType(queryNode, "OrderClause");
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if (orderByNode) {
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let nameNode = findNodeOfType(orderByNode, "Name");
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parsedQuery.orderBy = nameNode!.children![0].text!;
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let orderNode = findNodeOfType(orderByNode, "Order");
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parsedQuery.orderDesc = orderNode
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? orderNode.children![0].text! === "desc"
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: false;
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}
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let limitNode = findNodeOfType(queryNode, "LimitClause");
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if (limitNode) {
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let nameNode = findNodeOfType(limitNode, "Number");
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parsedQuery.limit = valueNodeToVal(nameNode!);
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}
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let filterNodes = collectNodesOfType(queryNode, "FilterExpr");
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for (let filterNode of filterNodes) {
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let val: any = undefined;
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let valNode = filterNode.children![2].children![0];
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val = valueNodeToVal(valNode);
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let f: Filter = {
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prop: filterNode.children![0].children![0].text!,
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op: filterNode.children![1].text!,
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value: val,
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};
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parsedQuery.filter.push(f);
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}
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let selectNode = findNodeOfType(queryNode, "SelectClause");
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if (selectNode) {
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// console.log("Select node", JSON.stringify(selectNode));
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parsedQuery.select = [];
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collectNodesOfType(selectNode, "Name").forEach((t) => {
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parsedQuery.select!.push(t.children![0].text!);
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});
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// let nameNode = findNodeOfType(selectNode, "Number");
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// parsedQuery.limit = +nameNode!.children![0].text!;
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}
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let renderNode = findNodeOfType(queryNode, "RenderClause");
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if (renderNode) {
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let renderNameNode = findNodeOfType(renderNode, "PageRef");
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if (!renderNameNode) {
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renderNameNode = findNodeOfType(renderNode, "String");
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}
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parsedQuery.render = valueNodeToVal(renderNameNode!);
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}
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// console.log(JSON.stringify(queryNode, null, 2));
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return parsedQuery;
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}
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