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feat(genapi): derive discriminators and decode RichText alternates

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The generator gated all union decoder emission behind knownDiscriminators, a
hand-curated map of 13 entries. Any sealed union absent from that map received
no decoder, so decoding must fail. Bot API v10 added RichBlock and RichText,
which were absent. Roughly 8.6 percent of Telegram updates failed with HTTP 400.

The generator now derives discriminators from the specification instead of a
fixed list. A gate check fails the build when a union resolves no discriminator.
Eleven unions gain decoders that never had one: BotCommandScope, InputMedia,
InputPaidMedia, InputPollMedia, InputPollOptionMedia, InputProfilePhoto,
InputRichBlock, InputStoryContent, PassportElementError, RichBlock and RichText.

RichText can also appear as a bare string or an array of RichText. The scraper
now extracts these alternate shapes into the intermediate representation. The
emitter adds RichTextPlain and RichTextSequence. The decoder dispatches on the
first JSON byte before it reads any discriminator.

Unions without alternates must regenerate byte for byte. The golden test proves
this.

Claude-Session: https://claude.ai/code/session_01Fu2wXqGUrfVBi5aLafKk8U
This commit is contained in:
lukaszraczylo
2026-09-15 10:59:48 +01:00
parent fa84f08b25
commit d666cda3b1
16 changed files with 4449 additions and 695 deletions
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testdata/golden/types.gen.go
Vendored
+5 -3
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@@ -7,14 +7,16 @@
package api
import (
"bytes"
"fmt"
"github.com/goccy/go-json"
"io"
)
var _ = io.Discard // keep import even if no fields use io
var _ = json.Marshal // keep import for UnmarshalXxx helpers
var _ = fmt.Errorf // keep import for UnmarshalXxx helpers
var _ = io.Discard // keep import even if no fields use io
var _ = json.Marshal // keep import for UnmarshalXxx helpers
var _ = fmt.Errorf // keep import for UnmarshalXxx helpers
var _ = bytes.TrimLeft // keep import for shape-dispatching UnmarshalXxx helpers (unions with alternates)
// This object represents a Telegram user or bot.
type User struct {