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#+private
package flags
import "core:container/bit_array"
import "core:strconv"
import "core:strings"
// Used to group state together.
Parser :: struct {
// `fields_set` tracks which arguments have been set.
// It uses their struct field index.
fields_set: bit_array.Bit_Array,
// `filled_pos` tracks which arguments have been filled into positional
// spots, much like how `fmt` treats them.
filled_pos: bit_array.Bit_Array,
}
parse_one_odin_arg :: proc(model: ^$T, parser: ^Parser, arg: string) -> (error: Error) {
arg := arg
if strings.has_prefix(arg, "-") {
arg = arg[1:]
flag: string
assignment_rune: rune
find_assignment: for r, i in arg {
switch r {
case ':', '=':
assignment_rune = r
flag = arg[:i]
arg = arg[1 + i:]
break find_assignment
case:
continue find_assignment
}
}
if assignment_rune == 0 {
if len(arg) == 0 {
return Parse_Error {
.No_Flag,
"No flag was given.",
}
}
// -flag
set_odin_flag(model, parser, arg) or_return
} else if assignment_rune == ':' {
// -flag:option <OR> -map:key=value
error = set_option(model, parser, flag, arg)
if error != nil {
// -flag:option did not work, so this may be a -map:key=value set.
find_equals: for r, i in arg {
if r == '=' {
key := arg[:i]
arg = arg[1 + i:]
error = set_key_value(model, parser, flag, key, arg)
break find_equals
}
}
}
} else {
// -flag=option, alternative syntax
set_option(model, parser, flag, arg) or_return
}
} else {
// positional
error = push_positional(model, parser, arg)
}
return
}
parse_one_unix_arg :: proc(model: ^$T, parser: ^Parser, arg: string) -> (
future_args: int,
current_flag: string,
error: Error,
) {
arg := arg
if strings.has_prefix(arg, "-") {
// -flag
arg = arg[1:]
if strings.has_prefix(arg, "-") {
// Allow `--` to function as `-`.
arg = arg[1:]
if len(arg) == 0 {
// `--`, and only `--`.
// Everything from now on will be treated as an argument.
future_args = max(int)
current_flag = INTERNAL_OVERFLOW_FLAG
return
}
}
flag: string
find_assignment: for r, i in arg {
if r == '=' {
// --flag=option
flag = arg[:i]
arg = arg[1 + i:]
error = set_option(model, parser, flag, arg)
return
}
}
// --flag option, potentially
future_args = set_unix_flag(model, parser, arg) or_return
current_flag = arg
} else {
// positional
error = push_positional(model, parser, arg)
}
return
}
// Parse a number of requirements specifier.
//
// Examples:
//
// `min`
// `<max`
// `min<max`
parse_requirements :: proc(str: string) -> (minimum, maximum: int, ok: bool) {
if len(str) == 0 {
return 1, max(int), true
}
if less_than := strings.index_byte(str, '<'); less_than != -1 {
if len(str) == 1 {
return 0, 0, false
}
#no_bounds_check left := str[:less_than]
#no_bounds_check right := str[1 + less_than:]
if left_value, parse_ok := strconv.parse_u64_of_base(left, 10); parse_ok {
minimum = cast(int)left_value
} else if len(left) > 0 {
return 0, 0, false
}
if right_value, parse_ok := strconv.parse_u64_of_base(right, 10); parse_ok {
maximum = cast(int)right_value
} else if len(right) > 0 {
return 0, 0, false
} else {
maximum = max(int)
}
} else {
if value, parse_ok := strconv.parse_u64_of_base(str, 10); parse_ok {
minimum = cast(int)value
maximum = max(int)
} else {
return 0, 0, false
}
}
ok = true
return
}
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