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feat(wpcarro/slx.js): Support JavaScript simple-select impl

Browse source 
See README.md

Change-Id: I6a50e34398c42aabe3cceba160be006f1867eca4
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7874
Reviewed-by: wpcarro <wpcarro@gmail.com>
Autosubmit: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI
This commit is contained in:
William Carroll 2023-01-19 10:09:13 -08:00 committed by clbot
parent 0dfe460fbb
commit 509e356bb8
4 changed files with 86 additions and 41 deletions
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9
users/wpcarro/scratch/simple-select/index.html
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@ -1,9 +0,0 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
</head>
<body>
<script src="./index.js"></script>
</body>
</html>

55
users/wpcarro/slx.js/README.md Normal file
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@ -0,0 +1,55 @@
# slx.js
Filter tabular data in the browser using an ergonomic query language.
## Status
This project is usable today (I use it in my projects), but it's currently alpha
status. See the wish list for remaining features.
## Installation
`slx.js` is available via CDN:
```shell
<script src="https://cdn.jsdelivr.net/gh/wpcarro/slx.js/index.js" async></script>
```
## Usage
`slx.js` hasn't been properly benchmarked, but in my personal projects, it works
fine with `O(1,000)s` of records.
```javascript
const cast = [
{ first: "Graham", last: "Chapman" },
{ first: "John", last: "Cleese" },
{ first: "Terry", last: "Gilliam" },
{ first: "Eric", last: "Idle" },
{ first: "Terry", last: "Jones" },
{ first: "Michael", last: "Palin" },
];
const config = {
// Match values case sensitively when filtering.
caseSensitive: false,
// Coerce values into regular expressions (instead of strings) when they're defined as atoms.
preferRegex: true,
// The key in the JS object that hosts the Date type against which we filter.
dateKey: 'Date',
};
console.log(select('last:^C.+$', cast, config));
// [{ first: "Graham", last: "Chapman" }, { first: "John", last: "Cleese" }]
```
## Wish List
- Support explicit grouping with parentheses (e.g. `title:once (director:Tarantino OR director:Coen)`).
- Proper benchmarking (see "Usage" section).
- Something something documentation.
- Something something testing.
## See also:
- [`slx`](https://github.com/wpcarro/slx)

11
users/wpcarro/slx.js/default.nix Normal file
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@ -0,0 +1,11 @@
{ pkgs, depot, ... }:
(pkgs.writeText "source.txt" ''
${depot.third_party.gitignoreSource ./.}
'').overrideAttrs (_: {
meta.ci.extraSteps.github = depot.tools.releases.filteredGitPush {
filter = ":/users/wpcarro/slx.js";
remote = "git@github.com:wpcarro/slx.js.git";
ref = "refs/heads/canon";
};
})

52
users/wpcarro/scratch/simple-select/index.js → users/wpcarro/slx.js/index.js
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@ -1,21 +1,9 @@
const state = {
// Match values case sensitively when filtering.
caseSensitive: false,
// Coerce values into regular expressions (instead of strings) when they're defined as atoms.
preferRegex: true,
// The key in the JS object that hosts the Date type against which we filter.
dateKey: 'Date',
};
// TODO(wpcarro): Support filtering by date (before, after).
// TODO(wpcarro): Support grouping with parentheses.
function select(query, xs) {
const predicate = compile(parse(query));
function select(query, xs, config) {
const predicate = compile(parse(query), config);
return xs.filter(predicate);
}
function compile(ast) {
function compile(ast, config) {
if (ast.type === 'CONJUNCTION') {
const lhs = compile(ast.lhs);
const rhs = compile(ast.rhs);
@ -38,12 +26,12 @@ function compile(ast) {
if (ast.val === 'yesterday') {
t.setDate(t.getDate() - 1);
console.log(t);
}
}
// MM/DD/YYYY
else {
t = new Date(ast.val);
}
return row[state.dateKey] < t;
return row[config.dateKey] < t;
};
}
if (ast.key === 'after') {
@ -52,12 +40,12 @@ function compile(ast) {
if (ast.val === 'yesterday') {
t.setDate(t.getDate() - 1);
console.log(t);
}
}
// MM/DD/YYYY
else {
t = new Date(ast.val);
}
return row[state.dateKey] > t;
return row[config.dateKey] > t;
};
}
}
@ -71,7 +59,7 @@ function compile(ast) {
if (ast.matchType === 'STRING') {
return function(row) {
return Object.values(row).some(x => {
if (state.caseSensitive) {
if (config.caseSensitive) {
return x === ast.val;
} else {
return x.toLowerCase() === ast.val.toLowerCase();
@ -87,7 +75,7 @@ function compile(ast) {
}
if (ast.type === 'STRING') {
return function(x) {
if (state.caseSensitive) {
if (config.caseSensitive) {
return x === ast.val;
} else {
return x.toLowerCase() === ast.val.toLowerCase();
@ -310,18 +298,18 @@ function selection(p) {
};
}
} else {
return matchAll(p);
return matchAll(p, config);
}
}
function matchAll(p) {
function matchAll(p, config) {
const [type, val] = p.tokens[p.i];
// Cast atoms into strings or regexes depending on the current state.
// Cast atoms into strings or regexes depending on the current config.
if (type === 'ATOM') {
p.i += 1;
if (state.preferRegex) {
const regex = state.caseSensitive ? new RegExp(val) : new RegExp(val, "i");
if (config.preferRegex) {
const regex = config.caseSensitive ? new RegExp(val) : new RegExp(val, "i");
return { type: 'MATCH_ALL', matchType: 'REGEX', val: regex };
} else {
return { type: 'MATCH_ALL', matchType: 'STRING', val }
@ -333,20 +321,20 @@ function matchAll(p) {
}
if (type === 'REGEX') {
p.i += 1;
const regex = state.caseSensitive ? new RegExp(val) : new RegExp(val, "i");
const regex = config.caseSensitive ? new RegExp(val) : new RegExp(val, "i");
return { type: 'MATCH_ALL', matchType: 'REGEX', val: regex };
}
throw `Parse Error: Expected a regular expression or a string, but got: ${p.tokens[p.i]}; ${JSON.stringify(p)}`;
}
function value(p) {
function value(p, config) {
const [type, val] = p.tokens[p.i];
// Cast atoms into strings or regexes depending on the current state.
// Cast atoms into strings or regexes depending on the current config.
if (type === 'ATOM') {
p.i += 1;
if (state.preferRegex) {
const regex = state.caseSensitive ? new RegExp(val) : new RegExp(val, "i");
if (config.preferRegex) {
const regex = config.caseSensitive ? new RegExp(val) : new RegExp(val, "i");
return { type: 'REGEX', val: regex };
} else {
return { type: 'STRING', val }
@ -358,7 +346,7 @@ function value(p) {
}
if (type === 'REGEX') {
p.i += 1;
const regex = state.caseSensitive ? new RegExp(val) : new RegExp(val, "i");
const regex = config.caseSensitive ? new RegExp(val) : new RegExp(val, "i");
return { type, val: regex };
}
throw `Parse Error: Expected a regular expression or a string, but got: ${p.tokens[p.i]}; ${JSON.stringify(p)}`;