Implemented labels (#6).

src/index.tests.ts

@@ -10,6 +10,7 @@ import * as floatColumn from "./float-column"
 import * as column from "./column"
 import * as columnSet from "./column-set"
 import * as labelPart from "./label-part"
+import * as label from "./label"
 import * as schema from "./schema"
 import * as index from "./index"
 
@@ -48,6 +49,9 @@ describe(`index`, () => {
   describe(`label part`, () => {
     it(`schema`, () => expect(index.labelPart).toBe(labelPart.schema))
   })
+  describe(`label`, () => {
+    it(`schema`, () => expect(index.label).toBe(label.schema))
+  })
   describe(`schema`, () => {
     it(`schema`, () => expect(index.schema).toBe(schema.schema))
   })

src/index.ts

@@ -53,6 +53,11 @@ export {
   Type as LabelPart
 } from "./label-part"
 
+export {
+  schema as label,
+  Type as Label
+} from "./label"
+
 export {
   schema as schema,
   Type as Schema

src/label.tests.ts

@@ -0,0 +1,17 @@
+import "jasmine"
+import * as label from "./label"
+import * as shared from "./shared.tests"
+
+describe(`label`, () => {
+  shared.run(shared.nonArrays, value => shared.rejects(
+    label.schema, value, `instance`, `is not of a type(s) array`
+  ))
+  shared.run(shared.emptyArrays, value => shared.accepts(label.schema, value))
+  shared.testLabelPart(label.schema, instance => [instance], `instance[0]`)
+  describe(`example`, () => shared.accepts(label.schema, [
+    [`for_eg`, `la_run`, `mu_par`],
+    [],
+    [`just_1`],
+    [`long_w`, `2thetp`, `wanna_`, `depest`, `lore__`]
+  ]))
+})

src/label.ts

@@ -0,0 +1,14 @@
+import * as jsonschema from "jsonschema"
+import * as labelPart from "./label-part"
+
+export const schema: jsonschema.Schema = {
+  description: `A list of chains of column identifiers which can be followed to find values which are concatenated to build a label.`,
+  type: `array`,
+  items: labelPart.schema
+}
+
+/**
+ * A list of chains of column identifiers which can be followed to find values
+ * which are concatenated to build a label.
+ */
+export type Type = ReadonlyArray<labelPart.Type>