seon

A reader for S-Expression-Object-Notation

See https://github.com/ayamada/seon2js

Usage (Library)

Add "seon": "^X.Y.Z" to "dependencies" in package.json.

And write import * as Seon from "seon/seon" in js file.

See https://github.com/ayamada/seon2js/tree/main/seon2js for example.

Usage (CLI)

npx seon2json [path/to/src.seon] [path/to/dst.json]

To read from seon file, and write to json file.

See package.seon.

The prime use case of this tool is to use to comment out in package.json. But it may cause a chicken-and-egg problem. Because npx seon2json package.seon write out to package.json, but it depend on package.json itself. Therefore I recommend npm i -g seon to install globally for initial execution.

Syntax

Almost the same as edn, but different below.

• , is unquote, NOT spacer.
• () is js-array for list expr. It have %L=1 extra property.
• [] is js-array for vector expr. It have %V=1 extra property. seon2json convert from this to json's [].
• {} is js-array for block expr. It have %B=1 extra property. seon2json convert from this to json's {}.
• Symbol and keyword are represented by encoded string in internal. Type of symbols and keywords are js-string. A keyword :foo is not equal ":foo", and a symbol bar is not equal "bar" too, because these are encoded. But seon2json outputs these to "foo" and "bar", because JSON is not support neither symbol nor keyword. Poorly. In addition, symbol and keyword has to suport namespace like clojure.
• #_ is provided as skip-next-one-element like clojure.

TODO

• Writer function will be provide in future, but not now.
• Scheme's SRFI-38 like syntax will provide in future, but not now.

ChangeLog

• 6.1.1: 20250225

  • Bump up version of dependencies

• 6.1.0: 20240610

  • Provide export default

• 6.0.0: 20240530

  • BREAKING CHANGES:
    • Deprecate to transform from nil to null by seon2json
  • Bump up version of dependencies

• 5.0.0: 20240315

  • BREAKING CHANGES:
    • Migrate almost dispatch fns to seon2js (without #_)

• 4.2.1: 20240314

  • Fix mangle/string2mangledString to treat slash character

• 4.2.0: 20240207

  • SYM and KW can also use as normal function

• 4.1.0: 20240206

  • Add SYM and KW for js backtick shortcut notation

• 4.0.0: 20240205

  • Deprecate renameNamespacesForStruct and provide rewriteAllSymbols

• 3.0.3: 20240131

  • Refine error message by unmatched parenthesis

• 3.0.2: 20240131

  • Add makeDenotation and isDenotation to seon/seon

• 3.0.1: 20240130

  • Add throwErrorIfInvalidSymbolName to seon/seon

• 3.0.0: 20240130

  • BREAKING CHANGES:
    • Remove renameInternalSeonNamespaces and add renameNamespacesForStruct in seon/util
  • Add seonCode2exprs to seon/util

• 2.0.0: 20240128

  • BREAKING CHANGES: Renew almost codes
    • Remove src/seon/sym.mjs
    • Remove sastring supports
    • Treat {} to array marked as block for recreate js-block
    • Modify mangle process
      • Remove to conversion from ? to is prefix
      • Through ? and . to js-varname for shortcut
    • Support #() #[] #{} syntax
    • Add #empty for js skipped value like [1,,3]

• 1.0.1: 20240106

  • Correct to mangle from -> to 2

• 1.0.0: 20240103

  • Breaking changes: npx seon2json mangles symbols and keywords now (for example: {:foo-bar? 1} -> {"isFooBar": 1}) If you don't want this, you should use string literal (for example: {"foo-bar?" 1} -> {"foo-bar?": 1})
  • Migrate seon/mangle module from seon2js
  • Hide error stacktrace of npx seon2json, and display error stacktrace by --show-error-stacktrace option
  • Display line number in message of object literal errors

• 0.4.3: 20231231

  • Change order of arguments of sym.sk2stringUnchecked

• 0.4.2: 20231231

  • sym.sk2stringUnchecked returns undefined by received non-sa

• 0.4.1: 20231231

  • Export sk2stringUnchecked by seon/sym

• 0.4.0: 20231231

  • Move out kebab2camel symbol2mangledName keyword2mangledName from seon/sym to seon2js

• 0.3.1: 20231230

  • sym.kebab2camel changes from -> to 2
  • sym.kebab2camel changes from start letter as number, to prepend x

• 0.3.0: 20231229

  • sym.kebab2camel changes from foo! to foo, not doFoo now

• 0.2.0: 20231226

  • Keep line number information by passing util.renameInternalSeonNamespaces

• 0.1.0: 20231223

  • Initial Release