From 31a9b3f4282334329540b7e75bf6e5ec3dae6030 Mon Sep 17 00:00:00 2001
From: gingerBill <bill@gingerbill.org>
Date: Fri, 31 May 2024 16:35:30 +0100
Subject: `core:encoding/ini`

---
 core/encoding/ini/ini.odin | 189 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 189 insertions(+)
 create mode 100644 core/encoding/ini/ini.odin

diff --git a/core/encoding/ini/ini.odin b/core/encoding/ini/ini.odin
new file mode 100644
index 000000000..eb0ad9e7c
--- /dev/null
+++ b/core/encoding/ini/ini.odin
@@ -0,0 +1,189 @@
+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) {
+		v, allocated, ok := strconv.unquote_string(val)
+		if !ok {
+			return strings.clone(val)
+		}
+		if allocated {
+			return v, nil
+		}
+		return strings.clone(v)
+
+	}
+
+	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(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
+	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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