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//! Meta renaming
// SPDX-FileCopyrightText: 2025 Nguyễn Gia Phong
// SPDX-License-Identifier: GPL-3.0-or-later
const StructField = std.builtin.Type.StructField;
const eql = std.mem.eql;
const isAlphanumeric = std.ascii.isAlphanumeric;
const isUpper = std.ascii.isUpper;
const startsWithIgnoreCase = std.ascii.startsWithIgnoreCase;
const std = @import("std");
const toLower = std.ascii.toLower;
const toUpper = std.ascii.toUpper;
fn camelCase(comptime orig: [:0]const u8) [:0]const u8 {
var camel: [orig.len + 1]u8 = undefined;
var n = 0;
var upper = false;
for (orig) |char| {
if (char == '_') {
upper = true;
continue;
}
camel[n] = if (n == 0)
toLower(char)
else if (upper)
toUpper(char)
else
char;
n += 1;
upper = false;
}
camel[n] = 0;
return camel[0..n:0];
}
pub inline fn kebabCase(comptime orig: [:0]const u8) [:0]const u8 {
var kebab: [orig.len * 2]u8 = undefined;
var n: usize = 0;
var sep = false;
for (orig) |char| {
switch (char) {
'(' => {
var i = n;
while (i > 0) : (i -= 1)
kebab[i] = switch (kebab[i - 1]) {
' ' => break,
else => kebab[i - 1],
};
kebab[i] = '(';
n += 1;
kebab[n] = ' ';
},
',' => {
sep = isAlphanumeric(char);
continue;
},
'.' => kebab[n] = '/',
'A'...'Z' => {
if (sep) {
kebab[n] = '-';
n += 1;
}
kebab[n] = toLower(char);
},
'_' => kebab[n] = '-',
else => kebab[n] = char,
}
n += 1;
sep = isAlphanumeric(char);
}
kebab[n] = 0;
return kebab[0..n:0];
}
fn snakeCase(comptime orig: [:0]const u8) [:0]const u8 {
if (orig[0] == '_')
return orig[1..];
var snake: [orig.len * 2]u8 = undefined;
var n: usize = 0;
var sep = false;
for (orig) |char| {
if (sep and isUpper(char)) {
snake[n] = '_';
n += 1;
}
sep = isAlphanumeric(char);
snake[n] = toLower(char);
n += 1;
}
snake[n] = 0;
return snake[0..n:0];
}
fn titleCase(comptime orig: [:0]const u8) [:0]const u8 {
var title: [orig.len + 1]u8 = undefined;
var n = 0;
var upper = true;
for (orig) |char| {
if (char == '_') {
upper = true;
continue;
}
title[n] = if (upper) toUpper(char) else char;
n += 1;
upper = false;
}
title[n] = 0;
return title[0..n:0];
}
pub fn space(container: type, comptime namespace: [:0]const u8,
comptime excludes: []const []const u8) type {
const src = @typeInfo(container).@"struct".decls;
@setEvalBranchQuota(src.len * 1000);
var dest: [src.len]StructField = undefined;
var n: usize = 0;
outer: inline for (src) |decl_info| {
if (!startsWithIgnoreCase(decl_info.name, namespace))
continue;
for (excludes) |name|
if (eql(u8, name, decl_info.name))
continue :outer;
if (!@hasDecl(container, decl_info.name))
continue;
const decl = @field(container, decl_info.name);
const T = @TypeOf(decl);
const basename = decl_info.name[namespace.len..];
dest[n] = .{
.name = switch (@typeInfo(T)) {
.type => titleCase,
.@"fn" => camelCase,
else => snakeCase,
}(if (basename.len == 0) namespace else basename),
.type = T,
.default_value_ptr = @ptrCast(&decl),
.is_comptime = true,
.alignment = 0,
};
n += 1;
}
return @Type(.{ .@"struct" = .{
.layout = .auto,
.fields = dest[0..n],
.decls = &.{},
.is_tuple = false,
} });
}
pub const janet = space(@cImport(@cInclude("janet.h")), "janet", &.{
// Extern variables
"janet_type_names", "janet_signal_names", "janet_status_names",
"janet_instructions",
"janet_stream_type", "janet_channel_type", "janet_parser_type",
"janet_rng_type", "janet_file_type", "janet_peg_type",
"janet_s64_type", "janet_u64_type",
// Dependency loops
"JanetEVCallback", "janet_async_start_fiber", "janet_async_start",
// Nontranslatable macros
"JANET_API", "JANET_CFUN",
"JANET_DEF", "JANET_DEF_S", "JANET_DEF_SD",
"JANET_EXPORT",
"JANET_FN", "JANET_FN_", "JANET_FN_D", "JANET_FN_S", "JANET_FN_SD",
"JANET_MODULE_ENTRY", "JANET_NO_RETURN", "JANET_OUT_OF_MEMORY",
"JANET_REG", "JANET_REG_", "JANET_REG_D",
"JANET_REG_END", "JANET_REG_S", "JANET_REG_SD",
"JANET_THREAD_LOCAL",
"janet_abstract_from_head",
"janet_eprintf", "janet_printf",
"janet_struct_from_head", "janet_tuple_from_head",
}){};
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