add innolitics license and make generate script more readable

pkg/tag/generate_tag_definitions.py

@@ -8,6 +8,30 @@
 
 INNOLITICS_VERSION_HASH = "8670abdd9ad16c61af5146ef857899699bdd9c5f" # rev2024b (please, update this comment when changing hash value)
 
+INNOLITICS_CREDITS = f'''// This file's contents are derived from the innolitics json representation of the dicom standard. 
+// The innolitics source is licensed as follows:
+// https://github.com/innolitics/dicom-standard/blob/{INNOLITICS_VERSION_HASH}/LICENSE.txt
+// 
+// Copyright (c) 2017 Innolitics, LLC.
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+// of the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.'''
+
 Tag = NamedTuple('Tag', [
     ('group', int),
     ('elem', int),
@@ -36,27 +60,22 @@ def read_tags_from_innolitics(version_hash: str) -> List[Tag]:
         if (resolvable_tag_id := e["id"].replace("x", "0")) and len(e["keyword"]) > 0
     ]
 
+def tagDictEntry(t: Tag) -> str:
+    wrap_in_quotes = lambda s: f'\"{s}\"'
+    start_indent = '	'
+    return f'{start_indent}{t.keyword}: Info{{{t.keyword}, []string{{{", ".join(map(wrap_in_quotes, t.vr))}}}, "{t.name}", "{t.keyword}", "{t.vm}", {str(t.retired).lower()}}},'
+
 def generate(out: IO[str]):
     tags = read_tags_from_innolitics(INNOLITICS_VERSION_HASH)
     new_line = chr(10)
-    wrap_in_quotes = lambda s: f'\"{s}\"'
     print(f'''// AUTO-GENERATED from generate_tag_definitions.py. DO NOT EDIT.
+{INNOLITICS_CREDITS}
 package tag
 
 {new_line.join(f"var {t.keyword} = Tag{{0x{t.group:04x}, 0x{t.elem:04x}}}" for t in tags)}
 
-var tagDict map[Tag]Info
-
-func init() {{
-	maybeInitTagDict()
-}}
-
-func maybeInitTagDict() {{
-	if len(tagDict) > 0 {{
-		return
-	}}
-	tagDict = make(map[Tag]Info)
-{new_line.join(f'	tagDict[{t.keyword}] = Info{{{t.keyword}, []string{{{", ".join(map(wrap_in_quotes, t.vr))}}}, "{t.name}", "{t.keyword}", "{t.vm}", {str(t.retired).lower()}}}' for t in tags)}
+var tagDict = map[Tag]Info{{
+{new_line.join(tagDictEntry(t) for t in tags)}
 }}''', file=out)
 
 def main():

pkg/tag/tag.go

@@ -170,7 +170,6 @@ func GetVRKind(tag Tag, vr string) VRKind {
 // Find finds information about the given tag. If the tag is not part of
 // the DICOM standard, or is retired from the standard, it returns an error.
 func Find(tag Tag) (Info, error) {
-	maybeInitTagDict()
 	entry, ok := tagDict[tag]
 	if !ok {
 		// (0000-u-ffff,0000)	UL	GenericGroupLength	1	GENERIC
@@ -198,7 +197,6 @@ func MustFind(tag Tag) Info {
 //
 // Example: FindTagByKeyword("TransferSyntaxUID")
 func FindByKeyword(keyword string) (Info, error) {
-	maybeInitTagDict()
 	for _, ent := range tagDict {
 		if ent.Keyword == keyword || ent.Name == keyword {
 			return ent, nil