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https://github.com/logos-messaging/nim-ffi.git
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106 lines
4.1 KiB
Nim
106 lines
4.1 KiB
Nim
## Unit tests for `{.ffiConst.}`: the per-backend rendering of a synthetic const
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## registry, plus an end-to-end generation run over a fixture so the macro's own
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## registration path is covered.
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import std/[os, strutils]
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import unittest2
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import ./fixture_gen
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import ffi/codegen/[meta, c, cpp, rust]
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proc constMeta(name, typeName, value: string): FFIConstMeta =
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FFIConstMeta(name: name, typeName: typeName, value: value)
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let consts = @[
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constMeta("maxPeers", "int", "42"),
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constMeta("DefaultTimeoutMs", "uint32", "3000"),
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constMeta("Ratio", "float64", "1.5"),
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constMeta("DebugEnabled", "bool", "false"),
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constMeta("Greeting", "string", "he\"llo\n"),
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]
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let ctor = FFIProcMeta(
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procName: "constlib_create",
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libName: "constlib",
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kind: FFIKind.CTOR,
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libTypeName: "ConstLib",
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returnTypeName: "ConstLib",
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)
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suite "constants in the C header":
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setup:
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let header = generateCLibHeader(@[ctor], @[], "constlib", @[], consts)
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test "scalars become typed static consts under an UPPER_SNAKE name":
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check "static const int64_t MAX_PEERS = 42;" in header
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check "static const uint32_t DEFAULT_TIMEOUT_MS = 3000;" in header
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check "static const double RATIO = 1.5;" in header
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check "static const bool DEBUG_ENABLED = false;" in header
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test "strings become const char* with escapes applied":
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check "static const char* const GREETING = \"he\\\"llo\\n\";" in header
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test "no constants means no constants section":
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let bare = generateCLibHeader(@[ctor], @[], "constlib")
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check "Generated constants" notin bare
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suite "constants in the abi = c header":
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test "the CBOR-free header carries the same declarations":
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let cabiCtor = FFIProcMeta(
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procName: "constlib_create",
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libName: "constlib",
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kind: FFIKind.CTOR,
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libTypeName: "ConstLib",
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returnTypeName: "ConstLib",
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abiFormat: ABIFormat.C,
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)
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let header = generateCAbiLibHeader(@[cabiCtor], @[], "constlib", @[], consts)
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check "static const int64_t MAX_PEERS = 42;" in header
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check "static const char* const GREETING = \"he\\\"llo\\n\";" in header
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suite "constants in the C++ header":
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setup:
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let header = generateCppHeader(@[ctor], @[], "constlib", @[], consts)
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test "constexpr, not static const":
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check "constexpr int64_t MAX_PEERS = 42;" in header
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check "constexpr bool DEBUG_ENABLED = false;" in header
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test "a string const is a const char*, not std::string":
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check "constexpr const char* GREETING = \"he\\\"llo\\n\";" in header
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suite "constants in the Rust crate":
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setup:
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let typesRs = generateTypesRs(@[], @[ctor], consts)
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test "pub const with the mapped Rust type":
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check "pub const MAX_PEERS: i64 = 42;" in typesRs
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check "pub const DEFAULT_TIMEOUT_MS: u32 = 3000;" in typesRs
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check "pub const RATIO: f64 = 1.5;" in typesRs
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test "a string const is a &str, without the redundant 'static":
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check "pub const GREETING: &str = \"he\\\"llo\\n\";" in typesRs
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suite "{.ffiConst.} end-to-end generation":
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test "the C header carries every annotated const, computed values included":
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let (outDir, _, code) = genFixtureBindings("consts_fixture", "c")
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require code == 0
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let header = readFile(outDir / "constlib.h")
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check "static const int64_t MAX_PEERS = 42;" in header
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# `3 * 1000` is evaluated before it reaches the registry.
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check "static const uint32_t DEFAULT_TIMEOUT_MS = 3000;" in header
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check "static const double RATIO = 1.5;" in header
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check "static const bool DEBUG_ENABLED = false;" in header
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check "static const char* const GREETING = \"he\\\"llo\\n\";" in header
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check "static const int64_t HTTP_PORT = 8080;" in header
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test "the Rust crate carries them too":
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let (outDir, _, code) = genFixtureBindings("consts_fixture", "rust")
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require code == 0
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let typesRs = readFile(outDir / "src" / "types.rs")
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check "pub const MAX_PEERS: i64 = 42;" in typesRs
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check "pub const DEFAULT_TIMEOUT_MS: u32 = 3000;" in typesRs
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check "pub const RATIO: f64 = 1.5;" in typesRs
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check "pub const DEBUG_ENABLED: bool = false;" in typesRs
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check "pub const GREETING: &str = \"he\\\"llo\\n\";" in typesRs
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check "pub const HTTP_PORT: i64 = 8080;" in typesRs
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