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feat: add Erlang binary and number predicates #187

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Merged
dbrattli merged 1 commit into from
Oct 18, 2026
Merged

feat: add Erlang binary and number predicates #187

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8 changes: 8 additions & 0 deletions src/otp/Erlang.fs
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Original file line number Diff line number Diff line change
Expand Up @@ -138,6 +138,14 @@ let exactEquals (a: 'T) (b: 'T) : bool = nativeOnly
[<Emit("erlang:is_list($0)")>]
let isList (term: 'T) : bool = nativeOnly

/// Returns true if Term is an Erlang binary (a bitstring of whole bytes).
[<Emit("erlang:is_binary($0)")>]
let isBinary (term: 'T) : bool = nativeOnly

/// Returns true if Term is an Erlang integer or float, without converting it.
[<Emit("erlang:is_number($0)")>]
let isNumber (term: 'T) : bool = nativeOnly

// ============================================================================
// Time
// ============================================================================
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29 changes: 29 additions & 0 deletions test/TestErlang.fs
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Expand Up @@ -40,6 +40,35 @@ let tests =
assertThat (Erlang.exactEquals ref1 ref1) (isTrue)
)

test (
"isBinary accepts binaries and rejects other terms",
fun _ ->
assertThat (Erlang.isBinary "hello") (isTrue)
assertThat (Erlang.isBinary "") (isTrue)
assertThat (Erlang.isBinary 42) (isFalse)
assertThat (Erlang.isBinary (Atom.ofString "hello")) (isFalse)

let charlist: Dynamic = emitErlExpr () "[104, 101, 108, 108, 111]"
let partialByte: Dynamic = emitErlExpr () "<<7:12>>"
assertThat (Erlang.isBinary charlist) (isFalse)
assertThat (Erlang.isBinary partialByte) (isFalse)
)

test (
"isNumber accepts integers and floats without accepting other terms",
fun _ ->
assertThat (Erlang.isNumber 42) (isTrue)
assertThat (Erlang.isNumber 1.5) (isTrue)
assertThat (Erlang.isNumber -2) (isTrue)
assertThat (Erlang.isNumber "42") (isFalse)
assertThat (Erlang.isNumber (Atom.ofString "forty_two")) (isFalse)

let list: Dynamic = emitErlExpr () "[1, 2]"
let tuple: Dynamic = emitErlExpr () "{1, 2}"
assertThat (Erlang.isNumber list) (isFalse)
assertThat (Erlang.isNumber tuple) (isFalse)
)

test (
"spawn creates a process",
fun _ ->
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