https://github.com/alexashley/cel-repl

A toy REPL for cel
https://github.com/alexashley/cel-repl

Last synced: 3 days ago
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A toy REPL for cel

• Host: GitHub
• URL: https://github.com/alexashley/cel-repl
• Owner: alexashley
• Created: 2021-03-05T03:59:32.000Z (over 3 years ago)
• Default Branch: main
• Last Pushed: 2021-08-19T01:15:46.000Z (about 3 years ago)
• Last Synced: 2024-06-19T19:42:12.564Z (5 months ago)
• Language: Go
• Homepage:
• Size: 21.5 KB
• Stars: 2
• Watchers: 1
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
## cel-repl

A bare-bones [REPL](https://en.wikipedia.org/wiki/Read%E2%80%93eval%E2%80%93print_loop) for [cel](https://github.com/google/cel-spec), powered by [`cel-go`](https://github.com/google/cel-go).

```bash

$ make

cel-repl v0.1.0-local started

type quit() to exit

(1)> 1 == 1

(2)> true

(2)> "foo".startsWith("bar")

(3)> false

(3)> 2 * 2             

(4)> 4

(4)> [1, 2, 3].filter(n, n > 2)

(5)> [3]

(5)> inspect(1)

(6)> id:2  call_expr:{function:"_==_"  args:{id:1  const_expr:{int64_value:1}}  args:{id:3  const_expr:{int64_value:1}}}

(6)> quit()

So long, and thanks for all the fish!

```

Feature progress:

- [x] repl

- [ ] inspect

    - [x] `inspect()` shows the parsed expression of the last command

    - [x] `inspect(n)` does the same for the nth expression

    - [ ] multiple formats

        - [x] JSON

        - [x] default Go inspection

        - [ ] pretty printer that walks AST

- [ ] history

    - [x] store raw source

    - [x] store previous parsed programs

    - [x] configurable limit

    - [ ] up/down arrows to navigate

    - [x] print history index in prompt

- [x] expose REPL commands to cel instead of handling externally

- [ ] `compile` function: parse expression and show parsed output

    - [ ] `compile(src)`

    - [ ] `compile(src, fmt)` -- same format options as inspect

- [ ] `eval` function (compile/check/run)

- [ ] `ieval` function ("immediate eval" -- no check, compile and run)

- [ ] `help` function: print all available functions

- [ ] load proto files and expose them to cel

- [ ] load data from files -- eval with protos

- [ ] load config from a file/flags/environment

- [ ] navigation shortcuts (ctrl-a/ctrl-e)

- [ ] clear screen

- [ ] restart/reload session

- [ ] autocomplete