v1.17.0 #771

antonmedv · 2025-03-16T09:16:10Z

antonmedv
Mar 16, 2025
Maintainer

Expr is a Go-centric expression language designed to deliver dynamic configurations with unparalleled accuracy,
safety, and speed.

program, err := expr.Compile(`let foo = bar(); baz(foo, foo)`)

In this release:

This release added the biggest change to the Expr language: if-else expressions and sequential expressions. #736 e750878

if foo > 42 {
    assert(foo);
    calc(foo, foo / 2)
} else {
    calc(0, 0)
}

A sequence of expression may be separated by ; char. The last semicolon must be omitted. Expr returns the value of the
last expression in the sequence.

If-else is also expressions. Each if must have an else part. Result of if-else can be used as an expression:

let foo = if bar > 0 {
    process(bar)
} else {
    fallback()
};
foo + 42

Added:

Added ast.Find helper for easy AST searching. 579de74
Added compile node budget and memory limits (feat: add node budget and memory limits #762)
Added uniq() builtin (Add uniq() function #705)
Added flatten() builtin (add flatten function #684)
Added types pkg (Introduce Nature concept #665 Refactor types table #667 Improve types pkg #668)

Improvements:

Allow tailing comma in arguments (Allow tailing comma in arguments #623)
Improved type checker for named types 6fa83ad
Now len() return runes count for string e8bd7f8
Improved VM code coverage (now 98%!) (test: add comprehensive VM opcode tests #750)
Improved support for auto-dereferences and pointer usage 2bc0eed f4bbea5 80f0ea6 4511e92 29dff34

Fixes:

Make sure get() returns nil for map[string]string on missing keys 435b79d
Fix func calls with nil types value d63c3b5
Do not optimize filter() | map() if #index is used 35bdb68
Fixed AST printing of ops with precedence (Fix print with precedence #678)
Separated patching phases for patchers that require multiple passes. (Separate patching phases for patchers that require multiple passes. #659)

This discussion was created from the release v1.17.0.

8000

yvesaston · 2025-04-04T13:57:46Z

yvesaston
Apr 4, 2025

@antonmedv, thanks to you and all the team taking care of Expr for your outstanding job !

0 replies

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antonmedv Mar 16, 2025 Maintainer

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yvesaston Apr 4, 2025

antonmedv
Mar 16, 2025
Maintainer

yvesaston
Apr 4, 2025