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const clap = @import("index.zig");
const std = @import("std");
const debug = std.debug;
const heap = std.heap;
const mem = std.mem;
pub fn ComptimeClap(comptime Id: type, comptime params: []const clap.Param(Id)) type {
var flags: usize = 0;
var options: usize = 0;
var converted_params: []const clap.Param(usize) = []clap.Param(usize){};
for (params) |param| {
const index = blk: {
if (param.names.long == null and param.names.short == null)
break :blk 0;
if (param.takes_value) {
const res = options;
options += 1;
break :blk res;
}
const res = flags;
flags += 1;
break :blk res;
};
const converted = clap.Param(usize).init(index, param.takes_value, param.names);
converted_params = converted_params ++ []clap.Param(usize){converted};
}
return struct {
options: [options]?[]const u8,
flags: [flags]bool,
pos: []const []const u8,
allocator: *mem.Allocator,
pub fn parse(allocator: *mem.Allocator, comptime ArgError: type, iter: *clap.args.Iterator(ArgError)) !@This() {
var pos = std.ArrayList([]const u8).init(allocator);
var res = @This(){
.options = []?[]const u8{null} ** options,
.flags = []bool{false} ** flags,
.pos = undefined,
.allocator = allocator,
};
var stream = clap.StreamingClap(usize, ArgError).init(converted_params, iter);
while (try stream.next()) |arg| {
const param = arg.param;
if (param.names.long == null and param.names.short == null) {
try pos.append(arg.value.?);
} else if (param.takes_value) {
// We slice before access to avoid false positive access out of bound
// compile error.
res.options[0..][param.id] = arg.value.?;
} else {
res.flags[0..][param.id] = true;
}
}
res.pos = pos.toOwnedSlice();
return res;
}
pub fn deinit(parser: *@This()) void {
parser.allocator.free(parser.pos);
parser.* = undefined;
}
pub fn flag(parser: @This(), comptime name: []const u8) bool {
const param = comptime findParam(name);
if (param.takes_value)
@compileError(name ++ " is an option and not a flag.");
return parser.flags[param.id];
}
pub fn option(parser: @This(), comptime name: []const u8) ?[]const u8 {
const param = comptime findParam(name);
if (!param.takes_value)
@compileError(name ++ " is a flag and not an option.");
return parser.options[param.id];
}
pub fn positionals(parser: @This()) []const []const u8 {
return parser.pos;
}
fn findParam(comptime name: []const u8) clap.Param(usize) {
comptime {
for (converted_params) |param| {
if (param.names.short) |s| {
if (mem.eql(u8, name, "-" ++ []u8{s}))
return param;
}
if (param.names.long) |l| {
if (mem.eql(u8, name, "--" ++ l))
return param;
}
}
@compileError(name ++ " is not a parameter.");
}
}
};
}
test "clap.comptime.ComptimeClap" {
const Clap = ComptimeClap(void, comptime []clap.Param(void){
clap.Param(void).flag({}, clap.Names{
.short = 'a',
.long = "aa",
}),
clap.Param(void).flag({}, clap.Names{
.short = 'b',
.long = "bb",
}),
clap.Param(void).option({}, clap.Names{
.short = 'c',
.long = "cc",
}),
clap.Param(void).positional({}),
});
var buf: [1024]u8 = undefined;
var fb_allocator = heap.FixedBufferAllocator.init(buf[0..]);
var arg_iter = clap.args.SliceIterator.init([][]const u8{
"-a", "-c", "0", "something",
});
var args = try Clap.parse(&fb_allocator.allocator, clap.args.SliceIterator.Error, &arg_iter.iter);
defer args.deinit();
debug.assert(args.flag("-a"));
debug.assert(args.flag("--aa"));
debug.assert(!args.flag("-b"));
debug.assert(!args.flag("--bb"));
debug.assert(mem.eql(u8, args.option("-c").?, "0"));
debug.assert(mem.eql(u8, args.option("--cc").?, "0"));
debug.assert(args.positionals().len == 1);
debug.assert(mem.eql(u8, args.positionals()[0], "something"));
}
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