toml: small refactor, move all json functionality to submodule (#12502)

vlib/toml/to/to.v

@@ -0,0 +1,137 @@
+// Copyright (c) 2021 Lars Pontoppidan. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+module to
+
+import toml
+import x.json2
+
+type DocOrAny = toml.Any | toml.Doc
+
+// json returns `doa` as a JSON encoded string.
+pub fn json(doa DocOrAny) string {
+	match doa {
+		toml.Doc {
+			return any_to_json(doa.ast_to_any(doa.ast.table))
+		}
+		toml.Any {
+			return any_to_json(doa)
+		}
+	}
+}
+
+// json returns `a` as a JSON encoded string.
+fn any_to_json(a toml.Any) string {
+	match a {
+		toml.Null {
+			return 'null'
+		}
+		toml.DateTime {
+			json_text := json2.Any(a.str())
+			return '"$json_text.json_str()"'
+		}
+		toml.Date {
+			json_text := json2.Any(a.str())
+			return '"$json_text.json_str()"'
+		}
+		toml.Time {
+			json_text := json2.Any(a.str())
+			return '"$json_text.json_str()"'
+		}
+		string {
+			return '"' + json2.Any(a.str()).json_str() + '"'
+		}
+		bool {
+			return json2.Any(bool(a)).json_str()
+		}
+		f32 {
+			return json2.Any(f32(a)).json_str()
+		}
+		f64 {
+			return json2.Any(f64(a)).json_str()
+		}
+		i64 {
+			return json2.Any(i64(a)).json_str()
+		}
+		int {
+			return json2.Any(int(a)).json_str()
+		}
+		u64 {
+			return json2.Any(u64(a)).json_str()
+		}
+		map[string]toml.Any {
+			mut str := '{'
+			for key, val in a {
+				json_key := json2.Any(key)
+				str += ' "$json_key.json_str()": ${any_to_json(val)},'
+			}
+			str = str.trim_right(',')
+			str += ' }'
+			return str
+		}
+		[]toml.Any {
+			mut str := '['
+			for val in a {
+				str += ' ${any_to_json(val)},'
+			}
+			str = str.trim_right(',')
+			str += ' ]'
+			return str
+		}
+	}
+}
+
+// json_any returns `Any` as a `x.json2.Any` type.
+pub fn json_any(a toml.Any) json2.Any {
+	match a {
+		toml.Null {
+			return json2.Null{}
+		}
+		toml.DateTime {
+			return json2.Any(a.str())
+		}
+		toml.Date {
+			return json2.Any(a.str())
+		}
+		toml.Time {
+			return json2.Any(a.str())
+		}
+		string {
+			return json2.Any(a.str())
+		}
+		bool {
+			return json2.Any(bool(a))
+		}
+		int {
+			return json2.Any(int(a))
+		}
+		f32 {
+			return json2.Any(f32(a))
+		}
+		f64 {
+			return json2.Any(f64(a))
+		}
+		i64 {
+			return json2.Any(i64(a))
+		}
+		u64 {
+			return json2.Any(u64(a))
+		}
+		map[string]toml.Any {
+			mut jmap := map[string]json2.Any{}
+			for key, val in a {
+				jmap[key] = json_any(val)
+			}
+			return jmap
+		}
+		[]toml.Any {
+			mut jarr := []json2.Any{}
+
+			for val in a {
+				jarr << json_any(val)
+			}
+
+			return jarr
+		}
+	}
+}