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// Reader and writer for a variant of the `.ini` file format with `key = value` entries in `[sections]`.
package encoding_ini
import "base:runtime"
import "base:intrinsics"
import "core:strings"
import "core:strconv"
import "core:io"
import "core:os"
import "core:fmt"
_ :: fmt
Options :: struct {
comment: string,
key_lower_case: bool,
}
DEFAULT_OPTIONS :: Options {
comment = ";",
key_lower_case = false,
}
Iterator :: struct {
section: string,
_src: string,
options: Options,
}
iterator_from_string :: proc(src: string, options := DEFAULT_OPTIONS) -> Iterator {
return {
section = "",
options = options,
_src = src,
}
}
// Returns the raw `key` and `value`. `ok` will be false if no more key=value pairs cannot be found.
// They key and value may be quoted, which may require the use of `strconv.unquote_string`.
iterate :: proc(it: ^Iterator) -> (key, value: string, ok: bool) {
for line_ in strings.split_lines_iterator(&it._src) {
line := strings.trim_space(line_)
if len(line) == 0 {
continue
}
if line[0] == '[' {
end_idx := strings.index_byte(line, ']')
if end_idx < 0 {
end_idx = len(line)
}
it.section = line[1:end_idx]
continue
}
if it.options.comment != "" && strings.has_prefix(line, it.options.comment) {
continue
}
equal := strings.index(line, " =") // check for things keys that `ctrl+= = zoom_in`
quote := strings.index_byte(line, '"')
if equal < 0 || quote > 0 && quote < equal {
equal = strings.index_byte(line, '=')
if equal < 0 {
continue
}
} else {
equal += 1
}
key = strings.trim_space(line[:equal])
value = strings.trim_space(line[equal+1:])
ok = true
return
}
it.section = ""
return
}
Map :: distinct map[string]map[string]string
load_map_from_string :: proc(src: string, allocator: runtime.Allocator, options := DEFAULT_OPTIONS) -> (m: Map, err: runtime.Allocator_Error) {
unquote :: proc(val: string) -> (string, runtime.Allocator_Error) {
if len(val) > 0 && (val[0] == '"' || val[0] == '\'') {
v, allocated, ok := strconv.unquote_string(val)
if !ok {
return strings.clone(val)
}
if allocated {
return v, nil
}
return strings.clone(v), nil
}
return strings.clone(val)
}
context.allocator = allocator
it := iterator_from_string(src, options)
for key, value in iterate(&it) {
section := it.section
if section not_in m {
section = strings.clone(section) or_return
m[section] = {}
}
// store key-value pair
pairs := &m[section]
new_key := unquote(key) or_return
if options.key_lower_case {
old_key := new_key
new_key = strings.to_lower(key) or_return
delete(old_key) or_return
}
pairs[new_key] = unquote(value) or_return
}
return
}
load_map_from_path :: proc(path: string, allocator: runtime.Allocator, options := DEFAULT_OPTIONS) -> (m: Map, err: runtime.Allocator_Error, ok: bool) {
data := os.read_entire_file(path, allocator) or_return
defer delete(data, allocator)
m, err = load_map_from_string(string(data), allocator, options)
ok = err == nil
defer if !ok {
delete_map(m)
}
return
}
save_map_to_string :: proc(m: Map, allocator: runtime.Allocator) -> (data: string) {
b := strings.builder_make(allocator)
_, _ = write_map(strings.to_writer(&b), m)
return strings.to_string(b)
}
delete_map :: proc(m: Map) {
allocator := m.allocator
for section, pairs in m {
for key, value in pairs {
delete(key, allocator)
delete(value, allocator)
}
delete(section)
delete(pairs)
}
delete(m)
}
write_section :: proc(w: io.Writer, name: string, n_written: ^int = nil) -> (n: int, err: io.Error) {
defer if n_written != nil { n_written^ += n }
io.write_byte (w, '[', &n) or_return
io.write_string(w, name, &n) or_return
io.write_byte (w, ']', &n) or_return
io.write_byte (w, '\n', &n) or_return
return
}
write_pair :: proc(w: io.Writer, key: string, value: $T, n_written: ^int = nil) -> (n: int, err: io.Error) {
defer if n_written != nil { n_written^ += n }
io.write_string(w, key, &n) or_return
io.write_string(w, " = ", &n) or_return
when intrinsics.type_is_string(T) {
val := string(value)
if len(val) > 0 && (val[0] == ' ' || val[len(val)-1] == ' ') {
io.write_quoted_string(w, val, n_written=&n) or_return
} else {
io.write_string(w, val, &n) or_return
}
} else {
n += fmt.wprint(w, value)
}
io.write_byte(w, '\n', &n) or_return
return
}
write_map :: proc(w: io.Writer, m: Map) -> (n: int, err: io.Error) {
section_index := 0
for section, pairs in m {
if section_index == 0 && section == "" {
// ignore section
} else {
write_section(w, section, &n) or_return
}
for key, value in pairs {
write_pair(w, key, value, &n) or_return
}
section_index += 1
}
return
}
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