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from __future__ import annotations
import pytest
from deg_cases import ARRAYS, INVOICE, PRODUCT_LISTING, SUPPORT_TICKET
from deg.response import (
MODEL_ID,
FieldResult,
FillError,
assemble,
concrete_pointer,
confidence,
decide_choice,
decide_noul,
decide_score,
extract,
generate,
)
from deg.schema import compile_schema
TICKET_CONTEXT = (
"From: dana@example.com\nOrder AB-1234 was charged twice. I need a refund today!"
)
def span_of(text, needle):
start = text.index(needle)
return (start, start + len(needle))
def ticket_results(plan):
f = plan.field
return {
"/department": decide_choice(f("/department"), [0.8, 0.15, 0.05]),
"/urgent": decide_noul(f("/urgent"), 0.91),
"/anger": decide_score(f("/anger"), [0.0, 0.1, 0.6, 0.3, 0.0]),
"/customer_email": extract(f("/customer_email"), TICKET_CONTEXT,
span_of(TICKET_CONTEXT, "dana@example.com"), 0.97),
"/order_id": extract(f("/order_id"), TICKET_CONTEXT,
span_of(TICKET_CONTEXT, "AB-1234"), 0.88),
"/reply": generate(f("/reply"), "Sorry about the double charge; refund issued.", 11),
}
def test_support_ticket_response():
plan = compile_schema(SUPPORT_TICKET)
body = assemble(plan, ticket_results(plan), {}, prompt_tokens=42)
assert body["model"] == MODEL_ID
assert body["value"] == {
"department": "billing",
"urgent": True,
"anger": 2,
"customer_email": "dana@example.com",
"order_id": "AB-1234",
"reply": "Sorry about the double charge; refund issued.",
}
assert list(body["value"]) == list(SUPPORT_TICKET["properties"]) # schema order
assert body["usage"] == {"prompt_tokens": 42, "generated_tokens": 11}
assert body["plan"] == plan.fingerprint
meta = body["meta"]
assert meta["/department"]["mode"] == "decide.choice"
assert meta["/department"]["probability"] == pytest.approx(0.8)
assert meta["/department"]["confidence"] == pytest.approx(confidence([0.8, 0.15, 0.05]))
assert meta["/urgent"] == {"mode": "decide.noul", "probability": 0.91}
assert meta["/anger"]["expected"] == pytest.approx(2.2)
assert meta["/customer_email"]["span"] == list(span_of(TICKET_CONTEXT, "dana@example.com"))
assert meta["/reply"] == {"mode": "generate", "generated_tokens": 11}
def test_optional_extract_not_found_is_omitted_nullable_is_null():
plan = compile_schema(SUPPORT_TICKET)
results = ticket_results(plan)
results["/order_id"] = extract(plan.field("/order_id"), TICKET_CONTEXT, None, 0.7)
results["/customer_email"] = extract(plan.field("/customer_email"), TICKET_CONTEXT, None, 0.6)
body = assemble(plan, results, {}, prompt_tokens=1)
assert "order_id" not in body["value"]
assert body["value"]["customer_email"] is None
assert body["meta"]["/order_id"]["null_reason"] == "not_found"
# A span that breaks the pattern is treated as not found, with the reason recorded.
bad = extract(plan.field("/order_id"), TICKET_CONTEXT, span_of(TICKET_CONTEXT, "refund"), 0.5)
assert bad.omit and bad.meta["null_reason"] == "pattern"
def test_required_extract_with_nothing_raises():
plan = compile_schema(INVOICE)
with pytest.raises(FillError, match="required non-nullable"):
extract(plan.field("/invoice_number"), "no invoice here", None, 0.2)
def test_invoice_with_arrays_and_parsers():
ctx = ("INVOICE #INV-0042 Issued: March 5, 2026 Due: 2026-04-04\n"
"Acme Corp https://acme.example\n"
"Widget x3 $1,200.00\nSupport plan $300.50\nTOTAL: $1,500.50 USD")
plan = compile_schema(INVOICE)
f = plan.field
results = {
"/invoice_number": extract(f("/invoice_number"), ctx, span_of(ctx, "INV-0042"), 0.99),
"/issued": extract(f("/issued"), ctx, span_of(ctx, "March 5, 2026"), 0.95),
"/due": extract(f("/due"), ctx, span_of(ctx, "2026-04-04"), 0.95),
"/vendor/name": extract(f("/vendor/name"), ctx, span_of(ctx, "Acme Corp"), 0.9),
"/vendor/website": extract(f("/vendor/website"), ctx,
span_of(ctx, "https://acme.example"), 0.9),
"/currency": decide_choice(f("/currency"), [0.97, 0.02, 0.01]),
"/line_items/0/description": extract(f("/line_items/*/description"), ctx,
span_of(ctx, "Widget"), 0.9),
"/line_items/0/quantity": extract(f("/line_items/*/quantity"), ctx, (ctx.index("x3") + 1,
ctx.index("x3") + 2), 0.8),
"/line_items/0/amount": extract(f("/line_items/*/amount"), ctx,
span_of(ctx, "$1,200.00"), 0.9),
"/line_items/1/description": extract(f("/line_items/*/description"), ctx,
span_of(ctx, "Support plan"), 0.9),
"/line_items/1/quantity": extract(f("/line_items/*/quantity"), ctx, None, 0.6),
"/line_items/1/amount": extract(f("/line_items/*/amount"), ctx,
span_of(ctx, "$300.50"), 0.9),
"/total": extract(f("/total"), ctx, span_of(ctx, "$1,500.50"), 0.9),
}
body = assemble(plan, results, {"/line_items": 2}, prompt_tokens=80)
assert body["value"] == {
"invoice_number": "INV-0042",
"issued": "2026-03-05",
"due": "2026-04-04",
"vendor": {"name": "Acme Corp", "website": "https://acme.example"},
"currency": "USD",
"line_items": [
{"description": "Widget", "quantity": 3, "amount": 1200},
{"description": "Support plan", "amount": 300.5},
],
"total": 1500.5,
}
assert body["usage"]["generated_tokens"] == 0
assert body["meta"]["/line_items"] == {"mode": "array", "items": 2}
def test_product_listing_generated_fields_and_token_totals():
plan = compile_schema(PRODUCT_LISTING)
ctx = "Used Lego castle set, complete, 4.5 stars, $45. Ships today."
f = plan.field
results = {
"/title": extract(f("/title"), ctx, span_of(ctx, "Lego castle set"), 0.9),
"/category": decide_choice(f("/category"), [0.0, 0.05, 0.9, 0.05]),
"/condition": decide_choice(f("/condition"), [0.05, 0.9, 0.05]),
"/price": extract(f("/price"), ctx, span_of(ctx, "$45"), 0.95),
"/rating": extract(f("/rating"), ctx, span_of(ctx, "4.5"), 0.9),
"/in_stock": decide_noul(f("/in_stock"), 0.8),
"/description": generate(f("/description"),
"A complete Lego castle. Fun for builders of all ages.", 14),
"/tags/0": generate(f("/tags/*"), "lego", 2),
"/tags/1": generate(f("/tags/*"), "castle", 2),
}
body = assemble(plan, results, {"/tags": 2}, prompt_tokens=30)
assert body["value"]["rating"] == 4.5
assert body["value"]["price"] == 45
assert body["value"]["tags"] == ["lego", "castle"]
assert body["usage"] == {"prompt_tokens": 30, "generated_tokens": 18}
def test_score_null_outcome_and_expected_level():
plan = compile_schema({"type": "object", "properties": {
"n": {"type": ["integer", "null"], "minimum": 1, "maximum": 3},
}})
n = decide_score(plan.field("/n"), [0.1, 0.1, 0.1, 0.7])
assert n.value is None and n.meta["expected"] == pytest.approx(2.0)
n2 = decide_score(plan.field("/n"), [0.1, 0.5, 0.1, 0.3])
assert n2.value == 2
def test_dev_fit_decode_rules():
plan = compile_schema({"type": "object", "properties": {
"b": {"type": "boolean"},
"s": {"type": "integer", "minimum": 1, "maximum": 5},
"n": {"type": ["integer", "null"], "minimum": 1, "maximum": 3},
}})
assert decide_noul(plan.field("/b"), 0.4).value is False
assert decide_noul(plan.field("/b"), 0.4, threshold=0.36).value is True
probs = [0.0, 0.45, 0.1, 0.0, 0.45] # argmax level 2, expected 3.35
assert decide_score(plan.field("/s"), probs).value == 2
assert decide_score(plan.field("/s"), probs, expected_bias=0.2).value == 4
assert decide_score(plan.field("/s"), probs, expected_bias=0.0).value == 3
# a winning null outcome stays null under the expected-level rule
assert decide_score(plan.field("/n"), [0.1, 0.1, 0.1, 0.7], expected_bias=0.2).value is None
def test_bounded_number_is_extracted_and_bounds_validate():
plan = compile_schema({"type": "object", "properties": {
"q": {"type": "number", "minimum": 0, "maximum": 1, "multipleOf": 0.25},
}, "required": ["q"]})
fld = plan.field("/q")
assert fld.mode == "extract.number" and fld.levels is None
ctx = "ratio 0.75, later 0.8"
assert extract(fld, ctx, span_of(ctx, "0.75"), 0.9).value == 0.75
with pytest.raises(FillError): # 0.8 is not a multiple of 0.25; required non-nullable
extract(fld, ctx, span_of(ctx, "0.8"), 0.9)
def test_tie_breaks_and_noul_threshold():
plan = compile_schema({"type": "object", "properties": {
"c": {"enum": ["a", "b"]}, "b": {"type": "boolean"}}})
assert decide_choice(plan.field("/c"), [0.5, 0.5]).value == "a"
assert decide_noul(plan.field("/b"), 0.5).value is True
assert decide_noul(plan.field("/b"), 0.4999).value is False
def test_arrays_nested_assembly():
plan = compile_schema(ARRAYS)
ctx = "Bob (aka Rob, Bobby) and Ann. Grid: 1 2 / 3"
f = plan.field
results = {
"/labels/0": decide_choice(f("/labels/*"), [0.9, 0.05, 0.05]),
"/people/0/name": extract(f("/people/*/name"), ctx, span_of(ctx, "Bob"), 0.9),
"/people/0/aliases/0": extract(f("/people/*/aliases/*"), ctx, span_of(ctx, "Rob"), 0.8),
"/people/0/aliases/1": extract(f("/people/*/aliases/*"), ctx, span_of(ctx, "Bobby"), 0.8),
"/people/1/name": extract(f("/people/*/name"), ctx, span_of(ctx, "Ann"), 0.9),
"/matrix/0/0": extract(f("/matrix/*/*"), ctx, span_of(ctx, "1"), 0.9),
"/matrix/0/1": extract(f("/matrix/*/*"), ctx, span_of(ctx, "2"), 0.9),
"/matrix/1/0": extract(f("/matrix/*/*"), ctx, span_of(ctx, "3"), 0.9),
}
lengths = {"/labels": 1, "/people": 2, "/people/0/aliases": 2, "/people/1/aliases": 0,
"/matrix": 2, "/matrix/0": 2, "/matrix/1": 1}
body = assemble(plan, results, lengths, prompt_tokens=5)
assert body["value"] == {
"labels": ["bug"],
"people": [{"name": "Bob", "aliases": ["Rob", "Bobby"]},
{"name": "Ann", "aliases": []}],
"matrix": [[1, 2], [3]],
}
def test_assembly_rejects_missing_extra_and_invalid():
plan = compile_schema(SUPPORT_TICKET)
results = ticket_results(plan)
missing = dict(results)
del missing["/urgent"]
with pytest.raises(FillError, match="missing field result"):
assemble(plan, missing, {}, prompt_tokens=0)
with pytest.raises(FillError, match="does not contain"):
assemble(plan, {**results, "/ghost": FieldResult(1, {"mode": "extract.span"})}, {},
prompt_tokens=0)
with pytest.raises(FillError, match="meta.mode"):
assemble(plan, {**results, "/urgent": FieldResult(True, {"mode": "generate"})}, {},
prompt_tokens=0)
with pytest.raises(FillError, match="is not one of"): # schema validation catches it
assemble(plan, {**results, "/department": FieldResult("hr", {"mode": "decide.choice"})},
{}, prompt_tokens=0)
def test_assembly_enforces_array_bounds():
plan = compile_schema(INVOICE)
ctx = "INV-1 2026-01-01 Acme USD"
f = plan.field
results = {
"/invoice_number": extract(f("/invoice_number"), ctx, (0, 5), 1.0),
"/issued": extract(f("/issued"), ctx, (6, 16), 1.0),
"/due": extract(f("/due"), ctx, None, 0.5),
"/vendor/name": extract(f("/vendor/name"), ctx, (17, 21), 1.0),
"/vendor/website": extract(f("/vendor/website"), ctx, None, 0.5),
"/currency": decide_choice(f("/currency"), [1, 0, 0]),
"/total": FieldResult(0, {"mode": "extract.number"}),
}
with pytest.raises(FillError, match="should be non-empty|too short"):
assemble(plan, results, {"/line_items": 0}, prompt_tokens=0) # minItems: 1
with pytest.raises(FillError, match="array length"):
assemble(plan, results, {}, prompt_tokens=0)
def test_generate_must_respect_bounds():
plan = compile_schema(PRODUCT_LISTING)
with pytest.raises(FillError, match="minLength"):
generate(plan.field("/description"), "too short", 3)
with pytest.raises(FillError, match="maxLength"):
generate(plan.field("/tags/*"), "x" * 25, 3)
def test_bad_inputs_rejected():
plan = compile_schema(SUPPORT_TICKET)
with pytest.raises(FillError):
decide_choice(plan.field("/department"), [0.5, 0.5]) # wrong arity
with pytest.raises(FillError):
decide_choice(plan.field("/department"), [0, 0, 0])
with pytest.raises(FillError):
decide_noul(plan.field("/urgent"), 1.5)
with pytest.raises(FillError, match="out of range"):
extract(plan.field("/order_id"), "abc", (2, 9), 0.5)
with pytest.raises(FillError, match="mode"):
decide_noul(plan.field("/department"), 0.5)
def test_date_time_assumed_offset_and_concrete_pointer():
plan = compile_schema({"type": "object", "properties": {
"at": {"type": "string", "format": "date-time"}}, "required": ["at"]})
ctx = "Seen 2026-10-08 14:30 local"
r = extract(plan.field("/at"), ctx, span_of(ctx, "2026-10-08 14:30"), 0.9,
default_offset="-05:00")
assert r.value == "2026-10-08T14:30:00-05:00" and r.meta["assumed_offset"] is True
assert concrete_pointer(["a/b", 0, "c~"]) == "/a~1b/0/c~0"
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