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Generate Gleam code from OpenAPI 3.x specifications
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src/oaspec/codegen/allof_merge.gleam
import gleam/dict
import gleam/int
import gleam/list
import oaspec/codegen/context.{type Context}
import oaspec/openapi/resolver
import oaspec/openapi/schema.{
type AdditionalProperties, type SchemaRef, Forbidden, Inline, ObjectSchema,
Reference, Typed, Untyped,
}
/// Result of merging allOf sub-schemas.
pub type MergedAllOf {
MergedAllOf(
properties: dict.Dict(String, SchemaRef),
required: List(String),
additional_properties: AdditionalProperties,
)
}
/// Merge allOf sub-schemas: properties, required, and additionalProperties.
/// Non-object sub-schemas (primitives, arrays) are included as a synthetic
/// "value" property to preserve their constraints.
pub fn merge_allof_schemas(
schemas: List(SchemaRef),
ctx: Context,
) -> MergedAllOf {
list.index_fold(
schemas,
MergedAllOf(
properties: dict.new(),
required: [],
additional_properties: Forbidden,
),
fn(acc, s_ref, idx) {
let resolved = case s_ref {
Inline(obj) -> Ok(obj)
Reference(..) -> resolver.resolve_schema_ref(s_ref, ctx.spec)
}
case resolved {
Ok(ObjectSchema(properties:, required:, additional_properties:, ..)) -> {
let merged_ap = case
additional_properties,
acc.additional_properties
{
Typed(x), _ -> Typed(x)
_, Typed(x) -> Typed(x)
Untyped, _ -> Untyped
_, Untyped -> Untyped
Forbidden, Forbidden -> Forbidden
}
MergedAllOf(
properties: dict.merge(acc.properties, properties),
required: list.append(acc.required, required),
additional_properties: merged_ap,
)
}
// Non-object sub-schemas: add as a synthetic "value" field
Ok(schema_obj) -> {
let field_name = case idx {
0 -> "value"
n -> "value_" <> int.to_string(n)
}
MergedAllOf(
..acc,
properties: dict.insert(
acc.properties,
field_name,
Inline(schema_obj),
),
required: [field_name, ..acc.required],
)
}
_ -> acc
}
},
)
}