Feat/legacy url so eo params (#532)

Author: Nir Maoz

__TESTS__/backwardsComaptibility/generateTransformationString.test.ts

@@ -180,5 +180,42 @@ describe('it works?', () => {
     const t = generateTransformationString(options);
     expect(t).toEqual("r_max");
   });
+  it("should support start_offset", function () {
+    const t = generateTransformationString({
+      start_offset: "1"
+    });
+
+    expect(t).toBe('so_1');
+  });
+  it("should support end_offset", function () {
+    const t = generateTransformationString({
+      end_offset: "0"
+    });
+
+    expect(t).toBe('eo_0');
+  });
+  it("should support start_offset & end_offset", function () {
+    const t = generateTransformationString({
+      start_offset: "0",
+      end_offset: 1
+    });
 
+    expect(t).toBe('eo_1,so_0');
+  });
+  it("should support offset", function () {
+    const t = generateTransformationString({
+      offset: '0..1'
+    });
+
+    expect(t).toBe('eo_1,so_0');
+  });
+  it("should prefer start_offset & end_offset over offset", function () {
+    const t = generateTransformationString({
+      offset: '0..1',
+      start_offset: 2,
+      end_offset: 3
+    });
+
+    expect(t).toBe('eo_3,so_2');
+  });
 });

src/backwards/generateTransformationString.ts

@@ -13,6 +13,7 @@ import {normRangeValues} from "./utils/norm_range_values.js";
 import {processVideoParams} from "./transformationProcessing/processVideoParams.js";
 import Transformation from "./transformation.js";
 import {processDpr} from "./transformationProcessing/processDpr.js";
+import {isNumberLike} from "./utils/isNumberLike";
 
 
 
@@ -171,12 +172,12 @@ export function generateTransformationString(transformationOptions: LegacyITrans
     dl: transformationOptions.delay,
     dn: transformationOptions.density,
     du: normRangeValues(transformationOptions.duration),
-    eo: normRangeValues(splitRange(transformationOptions.offset)[1]),
+    eo: normRangeValues(transformationOptions.end_offset || isNumberLike(transformationOptions.end_offset) ? transformationOptions.end_offset : splitRange(transformationOptions.offset)[1]),
     f: transformationOptions.fetch_format,
     g: transformationOptions.gravity,
     pg: transformationOptions.page,
     p: transformationOptions.prefix,
-    so: normRangeValues(splitRange(transformationOptions.offset)[0]),
+    so: normRangeValues(transformationOptions.start_offset || isNumberLike(transformationOptions.start_offset) ? transformationOptions.start_offset : splitRange(transformationOptions.offset)[0]),
     sp: transformationOptions.streaming_profile,
     vc: processVideoParams(transformationOptions.video_codec),
     vs: transformationOptions.video_sampling