v1.12.7

Expr is a Go package that offers a fast, simple, and safe engine for compiling and evaluating expressions. Ideal for implementing complex logic in configuration, it serves as a foundation for a dynamic business rule engine without the need for recompiling the program.

• Added new opcode OpInvalid for debugging purposes.

v1.12.6

What's Changed

• Churn: remove duplicate codes by @Schneizelw in #356
• Fix: fixed a compilation error. by @PranavPeshwe in #355
• Doc: update Visitor-and-Patch.md by @mdmcconnell in #369
• Feature: env[] keyword implemented in parser by @mdmcconnell in #382

New Contributors

• @Schneizelw made their first contribution in #356
• @PranavPeshwe made their first contribution in #355
• @mdmcconnell made their first contribution in #369

Full Changelog: v1.12.5...v1.12.6

v1.12.5

fb81647 Fixed param type overwriting in type propagation logic
b3fb3b9 Added a more beautiful program disassemble output

v1.12.4

• Fixed method calls on interfaces 1a1138d

v1.12.3

What's Changed

• Fixed nil key check in map by @antonmedv in #351
• Added Wrap and Unwrap method to hold self error by @hesining in #352

New Contributors

• @hesining made their first contribution in #352

Full Changelog: v1.12.2...v1.12.3

v1.12.2

• Fixed runtime.Fetch for named slices by @blotus in #349

New Contributors

• @blotus made their first contribution in #349

Full Changelog: v1.12.1...v1.12.2

v1.12.1

• Fixed a bug with builtins and nil argument.

v1.12.0

• Added nil coalescing operator ??.

Example:

user?.Name ?? "Anonymous"

v1.11.1

• Fixed abs() for positive numbers

v1.11.0

Expr – an expression language for Go.

This release introduces a new API for defining functions inside Expr - expr.Function.

From an Expr expression is already possible to call any Go methods and functions, but Expr has to use reflect package in doing such calls.
In previous releases, Expr added a special case for func (...any) any to avoid using reflect. But such functions lack type information. With newly added expr.Function option now it's possible to define a fast function with optional types! Read more in the docs.

atoi := expr.Function(
	"atoi",
	func(params ...any) (any, error) {
		return strconv.Atoi(params[0].(string))
	},
	new(func(string) int),
)

program, err := expr.Compile(`atoi("42")`, atoi)

Also in this release:

• Added bool condition optimization.
• Added support for comments // and /* ... */.
• Added support for negative indexes list[-1].
• Predicate brackets are now optional all(list, .values > 0).
• Added int() and float() builtins.
• Improved built-in functions performance.