AIP Svelte Filter - Google API Filter Parser (AIP-160)

A headless Svelte utility and parser for Google API filter expressions, using a Peggy grammar. This module provides parsing, validation, and AST utilities for Google-style filter strings, suitable for use in Svelte apps or as a standalone JS utility.

Features

• Parses Google API filter expressions (AIP-160)
• Returns AST, error, and validity
• Pretty-prints AST
• Headless Svelte component for easy integration
• SSR Compatible - Works with SvelteKit and other SSR frameworks

Usage (JS/TS)

import { parse, prettyPrintAst, summarizeGrammar } from "./parser";

const result = parse('post = "posts/1234-1234-1234-1234"');
if (result.isSuccess) {
  console.log("AST:", result.ast);
  console.log("Pretty:", prettyPrintAst(result.ast));
  console.log("Summary:", summarizeGrammar(result.ast));
} else {
  console.error("Parse error:", result.errors);
}

Usage (Svelte Headless Component)

<script lang="ts">
  import FilterParser from './FilterParser.svelte';
  let filter = 'post = "posts/1234-1234-1234-1234"';
</script>

<FilterParser {filter} let:ast let:isValid let:error let:prettyAst let:summary />

API

parse(input: string): ParseResult

• Parses a filter string, returns { isSuccess, errors, ast }.

prettyPrintAst(ast: any): string

• Returns a pretty-printed string of the AST.

summarizeGrammar(ast: any): string

• Returns a summary string for the AST.

<FilterParser filter={string} let:ast let:isValid let:error let:prettyAst let:summary />

• Svelte headless component. All values are reactive.

SSR Compatibility

This package is fully compatible with server-side rendering (SSR) environments like SvelteKit. The parser functions work in both Node.js and browser environments, and the FilterParser component is designed to be SSR-safe.

SvelteKit Usage

<script lang="ts">
  import { parse } from 'aip-svelte-filter';
  import FilterParser from 'aip-svelte-filter/FilterParser.svelte';

  let filter = 'name = "example"';

  // This works in both SSR and client-side
  const result = parse(filter);
</script>

<!-- This component is SSR-safe -->
<FilterParser {filter} let:ast let:isValid let:error>
  {#if isValid}
    <p>Filter is valid!</p>
  {:else}
    <p>Error: {error}</p>
  {/if}
</FilterParser>

Development

Prerequisites

• Node.js 18+
• npm

Setup

git clone https://github.com/stevenklar/aip-svelte-filter.git
cd aip-svelte-filter
npm install

Building

# Build the grammar file
npm run build:grammar

# Build the package
npm run build

Testing

# Run tests once
npm test

# Run tests in watch mode
npm run test:watch

# Run tests with coverage
npm run test:coverage

Linting and Type Checking

# Type check
npm run check

# Lint code
npm run lint

# Format code
npm run format

CI/CD

The project uses GitHub Actions for continuous integration:

• CI Pipeline: Runs tests, linting, and builds on Node.js 18, 20, and 22
• Release Pipeline: Automatically publishes to npm when a release is created
• Dependabot: Automatically updates dependencies weekly

MIT License.