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// Top-level module
// Copyright (C) 2024 Nguyễn Gia Phong
//
// This file is part of jz.
//
// jz is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// jz is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with jz. If not, see <https://www.gnu.org/licenses/>.
const SourceLocation = std.builtin.SourceLocation;
const Struct = std.builtin.Type.Struct;
const StructField = std.builtin.Type.StructField;
const Tuple = std.meta.Tuple;
const assert = std.debug.assert;
const c = @cImport(@cInclude("janet.h"));
const expectEqual = std.testing.expectEqual;
const log10 = std.math.log10;
const std = @import("std");
const zeroes = std.mem.zeroes;
/// Initialize global Janet state, that is thread local.
pub fn init() void {
_ = c.janet_init();
}
/// Free resources managed by Janet.
pub const deinit = c.janet_deinit;
/// Janet environment Table.
pub const Table = c.JanetTable;
/// Return a core environment Table based on the given optional one.
pub const coreEnv = c.janet_core_env;
/// Janet value structure.
pub const Value = c.Janet;
/// Evaluate the Janet program given in str.
pub fn eval(env: *Table, str: []const u8, src: [*:0]const u8) !Value {
var ret: Value = undefined;
const errflags = c.janet_dobytes(env, str.ptr, @intCast(str.len), src, &ret);
// Errors are already logged by Janet,
// among them only one is returned and not machine-readable.
return if (errflags == 0) ret else error.JanetError;
}
/// Wrap native type in Janet value.
fn wrap(x: anytype) Value {
return switch (@TypeOf(x)) {
f64 => c.janet_wrap_number(x),
bool => c.janet_wrap_boolean(@intFromBool(x)),
[*:0]const u8 => c.janet_wrap_string(x),
i32 => c.janet_wrap_integer(x),
else => unreachable,
};
}
/// Unwrap to native type.
fn unwrap(comptime T: type, x: Value) T {
return switch (T) {
[*:0]const u8 => c.janet_unwrap_string(x),
bool => c.janet_unwrap_boolean(x) != 0,
f64 => c.janet_unwrap_number(x),
i32 => c.janet_unwrap_integer(x),
else => unreachable,
};
}
test "isomorphism" {
inline for (.{
true,
@as(i32, 42069),
@as(f64, 420.69),
@as([*:0]const u8, "foobar"),
}) |x| try expectEqual(x, unwrap(@TypeOf(x), wrap(x)));
}
fn get(comptime T: type, argv: [*c]Value, n: i32) T {
return switch (T) {
f64 => c.janet_getnumber(argv, n),
[*:0]const u8 => c.janet_getcstring(argv, n),
bool => c.janet_getboolean(argv, n) != 0,
i32 => c.janet_getinteger(argv, n),
i64 => c.janet_getinteger64(argv, n),
usize => c.janet_size(argv, n),
else => unreachable,
};
}
pub fn def(env: *Table, comptime fun: anytype, reg: struct {
prefix: ?[*:0]const u8 = null,
name: [*:0]const u8,
documentation: [*:0]const u8,
source: SourceLocation,
}) void {
const function = @typeInfo(@TypeOf(fun)).Fn;
if (function.is_generic)
@compileError("fun is generic");
if (function.is_var_args)
@compileError("fun is variadic");
const n = function.params.len;
comptime var fields: [n]type = undefined;
inline for (&fields, function.params) |*field, param|
field.* = param.type.?;
const cfun = struct {
fn cfun(argc: i32, argv: [*c]Value) callconv(.C) Value {
c.janet_fixarity(argc, n);
var args: Tuple(&fields) = undefined;
inline for (&args, function.params, 0..) |*arg, param, i|
arg.* = get(param.type.?, argv, i);
const result = @call(.auto, fun, args);
return wrap(result);
}
}.cfun;
const cfuns = [_]c.JanetRegExt{
.{
.name = reg.name,
.cfun = cfun,
.documentation = reg.documentation,
.source_file = reg.source.file,
.source_line = @bitCast(reg.source.line),
},
zeroes(c.JanetRegExt),
};
if (reg.prefix) |prefix|
c.janet_cfuns_ext_prefix(env, prefix, &cfuns)
else
c.janet_cfuns_ext(env, null, &cfuns);
}
test def {
init();
defer deinit();
var env = coreEnv(null);
def(env, struct {
fn add(a: i32, b: i32) i32 { return a + b; }
}.add, .{
.name = "add",
.documentation = "(add a b)\n\nReturn a + b.",
.source = @src(),
});
try expectEqual(unwrap(i32, try eval(env, "(add 3 7)", "add")), 10);
}
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