Validation

generator/harmonic_time.py

@@ -5,6 +5,21 @@ import fractions
 
 import generator.model
 
+
+def solo_source(staff):
+  """Source-form pickup context, shared by training and arranged choruses.
+
+  The arrangement repeats the source form before each solo. Only an unlabelled
+  pickup inherits its preceding source-form harmony. Scores without a pickup
+  retain their ordinary initial-harmony checks. Explicit pickup harmony
+  (including N.C.) still takes precedence in read().
+  """
+  from generator.score import body_start_measure_index
+  measures=staff['measures'];initial=None
+  if body_start_measure_index(measures):
+    initial=next((h for m in reversed(measures) for h in reversed(m['harmonies'])),None)
+  return read(staff,initial=initial)
+
 @dataclasses.dataclass(frozen=True)
 class ChordSpan:
   start: fractions.Fraction