/
search.ts
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/
search.ts
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import { merge } from "../core/utils.ts";
import { Directory } from "../core/filesystem.ts";
import { Data, Page, Site } from "../core.ts";
export interface Options {
/** The helper name */
name: string;
/** To return only the `page.data` value */
returnPageData: boolean;
}
export const defaults: Options = {
name: "search",
returnPageData: false,
};
/** Register the plugin to enable the `search` helpers */
export default function (userOptions?: Partial<Options>) {
const options = merge(defaults, userOptions);
return (site: Site) => {
site.data(options.name, new Search(site, options.returnPageData));
site.filter("data", data);
};
}
type Query = string | string[];
type Condition = [string, string, unknown];
/** Search helper */
export class Search {
#site: Site;
#cache = new Map<string, Page[]>();
#returnPageData: boolean;
constructor(site: Site, returnPageData: boolean) {
this.#site = site;
this.#returnPageData = returnPageData;
site.addEventListener("beforeUpdate", () => this.#cache.clear());
}
/** Return the data in the scope of a path (file or folder) */
data(path = "/"): Data | undefined {
let result: Directory | Page | undefined = this.#site.source.root;
const pieces = path.split("/");
for (const name of pieces) {
if (!name) {
continue;
}
if (result instanceof Directory) {
result = result.dirs.get(name) || result.pages.get(name);
continue;
}
return undefined;
}
if (result) {
return result.data;
}
}
/** Search pages */
pages(query?: Query, sort?: Query, limit?: number) {
const pages = this.#searchPages(query, sort);
const result = this.#returnPageData ? data(pages) : pages;
if (!limit) {
return result;
}
return (limit < 0) ? result.slice(limit) : result.slice(0, limit);
}
/** Search and return a page */
page(query?: Query, sort?: Query) {
return this.pages(query, sort)[0];
}
/** Returns all values from the same key of a search */
values(key: string, query?: Query) {
const values = new Set();
this.#searchPages(query).forEach((page) => {
const value = page.data[key];
if (Array.isArray(value)) {
value.forEach((v) => values.add(v));
} else if (value !== undefined) {
values.add(value);
}
});
return Array.from(values);
}
/** Returns all tags values of a search */
tags(query?: Query) {
return this.values("tags", query);
}
/** Return the next page of a search */
nextPage(url: string, query?: Query, sort?: Query) {
const pages = this.#searchPages(query, sort);
const index = pages.findIndex((page) => page.data.url === url);
return (index === -1)
? undefined
: this.#returnPageData
? pages[index + 1].data
: pages[index + 1];
}
/** Return the previous page of a search */
previousPage(url: string, query?: Query, sort?: Query) {
const pages = this.#searchPages(query, sort);
const index = pages.findIndex((page) => page.data.url === url);
return (index <= 0)
? undefined
: this.#returnPageData
? pages[index - 1].data
: pages[index - 1];
}
#searchPages(query?: Query, sort: Query = "date"): Page[] {
if (Array.isArray(query)) {
query = query.join(" ");
}
const id = JSON.stringify([query, sort]);
if (this.#cache.has(id)) {
return [...this.#cache.get(id)!];
}
const filter = buildFilter(query, this.#site.options.server.page404);
const result = this.#site.pages.filter(filter);
result.sort(buildSort(sort));
this.#cache.set(id, result);
return [...result];
}
}
function data(pages: Page[]): Data[] {
return pages.map((page) => page.data);
}
/**
* Parse a query string and return a function to filter a search result
*
* example: "title=foo level<3"
* returns: (page) => page.data.title === "foo" && page.data.level < 3
*/
export function buildFilter(query = "", page404 = ""): (page: Page) => boolean {
// (?:(fieldName)(operator))?(value|"value"|'value')
const matches = query
? query.matchAll(
/(?:([\w.-]+)([!^$*]?=|[<>]=?))?([^'"\s][^\s=<>]*|"[^"]+"|'[^']+')/g,
)
: [];
const conditions: Condition[] = [
// Always return html pages
["outputPath", "$=", ".html"],
// Exclude the 404 page
["data.url", "!=", page404],
];
for (const match of matches) {
let [, key, operator, value] = match;
if (!key) {
key = "tags";
operator = "*=";
}
conditions.push([`data.${key}`, operator, compileValue(value)]);
}
return compileFilter(conditions);
}
/**
* Convert a parsed query to a function
*
* example: [["data.title", "=", "foo"], ["data.level", "<", 3]]
* returns: (page) => page.data.title === "foo" && page.data.level < 3
*/
function compileFilter(conditions: Condition[]) {
const filters: string[] = [];
const args: string[] = [];
const values: unknown[] = [];
conditions.forEach((condition, index) => {
const [key, operator, value] = condition;
const varName = `value${index}`;
filters.push(compileCondition(key, operator, varName, value));
args.push(varName);
values.push(value);
});
args.push(`return (page) => ${filters.join(" && ")};`);
const factory = new Function(...args);
return factory(...values);
}
/**
* Convert a parsed condition to a function
*
* example: key = "title", operator = "=" name = "value0" value = "foo"
* returns: page.data.title === value0
*/
function compileCondition(
key: string,
operator: string,
name: string,
value: unknown,
) {
key = key.replaceAll(".", "?.");
if (value instanceof Date) {
switch (operator) {
case "=":
return `page.${key}?.getTime() === ${name}.getTime()`;
case "!=":
return `page.${key}?.getTime() !== ${name}.getTime()`;
case "<":
case "<=":
case ">":
case ">=":
return `page.${key}?.getTime() ${operator} ${name}.getTime()`;
default:
throw new Error(`Operator ${operator} not valid for Date values`);
}
}
if (Array.isArray(value)) {
switch (operator) {
case "=":
return `${name}.some((i) => page.${key} === i)`;
case "!=":
return `${name}.some((i) => page.${key} !== i)`;
case "^=":
return `${name}.some((i) => page.${key}?.startsWith(i))`;
case "$=":
return `${name}.some((i) => page.${key}?.endsWith(i))`;
case "*=":
return `${name}.some((i) => page.${key}?.includes(i))`;
default: // < <= > >=
return `${name}.some((i) => page.${key} ${operator} i)`;
}
}
switch (operator) {
case "=":
return `page.${key} === ${name}`;
case "!=":
return `page.${key} !== ${name}`;
case "^=":
return `page.${key}?.startsWith(${name})`;
case "$=":
return `page.${key}?.endsWith(${name})`;
case "*=":
return `page.${key}?.includes(${name})`;
default: // < <= > >=
return `page.${key} ${operator} ${name}`;
}
}
/**
* Compile a value and return the proper type
*
* example: "true" => true
* example: "foo" => "foo"
* example: "2021-06-12" => new Date(2021, 05, 12)
*/
function compileValue(value: string): unknown {
if (!value) {
return value;
}
// Remove quotes
const quoted = !!value.match(/^('|")(.*)\1$/);
if (quoted) {
value = value.slice(1, -1);
}
if (value.includes("|")) {
return value.split("|").map((val) => compileValue(val));
}
if (quoted) {
return value;
}
if (value.toLowerCase() === "true") {
return true;
}
if (value.toLowerCase() === "false") {
return false;
}
if (value.toLowerCase() === "undefined") {
return undefined;
}
if (value.toLowerCase() === "null") {
return null;
}
if (value.match(/^\d+$/)) {
return Number(value);
}
if (typeof value === "number" && isFinite(value)) {
return Number(value);
}
// Date or datetime values:
// yyyy-mm
// yyyy-mm-dd
// yyyy-mm-ddThh
// yyyy-mm-ddThh:ii
// yyyy-mm-ddThh:ii:ss
const match = value.match(
/^(\d{4})-(\d\d)(?:-(\d\d))?(?:T(\d\d)(?::(\d\d))?(?::(\d\d))?)?$/i,
);
if (match) {
const [, year, month, day, hour, minute, second] = match;
return new Date(
parseInt(year),
parseInt(month) - 1,
day ? parseInt(day) : 1,
hour ? parseInt(hour) : 0,
minute ? parseInt(minute) : 0,
second ? parseInt(second) : 0,
);
}
return value;
}
/**
* Convert a query to sort to a function
*
* example: "title=desc"
* returns: (a, b) => a.data.title > b.data.title
*/
export function buildSort(sort: Query): (a: Page, b: Page) => number {
let fn = "0";
if (typeof sort === "string") {
sort = sort.split(/\s+/).filter((arg) => arg);
}
sort.reverse().forEach((arg) => {
const match = arg.match(/([\w.-]+)(?:=(asc|desc))?/);
if (!match) {
return;
}
let [, key, direction] = match;
key = key.replaceAll(".", "?.");
const operator = direction === "desc" ? ">" : "<";
fn =
`(a.data?.${key} == b.data?.${key} ? ${fn} : (a.data?.${key} ${operator} b.data?.${key} ? -1 : 1))`;
});
return new Function("a", "b", `return ${fn}`) as (a: Page, b: Page) => number;
}