valor
Translation status: Tiếng Việt reader-locale proof. Code fences render through the vi pipeline; prose is canonical Latin.
JSON-shaped dynamic value literal for open object-shaped data.
Syntax: valor
Category#
conversion
Related#
Examples#
radix/corpus/conversio/valor-boxing.fab (canonical · conversio)#
T ↦ valor boxing for scalar, byte, collection, genus, and tensor carriers.
# =============================================================================
# valor — T ↦ valor boxing for scalar, byte, collection, genus, and tensor carriers.
# =============================================================================
#
# What this teaches:
# • Boxing into valor — `T ↦ valor` boxes any typed value (scalar, byte, collection, genus, tensor) into the canonical dynamic carrier.
# • Byte preservation — `octeti ↦ valor` composes as numeric byte values; it must not lossy-decode bytes as text.
#
# Common mistakes:
# • Expecting to extract a specific type from valor without a matching variant — valor requires the correct runtime variant or `⇥` recovery.
#
# See also: ↦, valor, octeti, lista, tabula, genus, tensor
# =============================================================================
# conversio — typed values to valor boxing
#
# WHY: `T ↦ valor` boxes typed values into the canonical dynamic carrier.
# `octeti` composes as a list of numeric byte values; it must not lossy-decode
# bytes as text.
class Punctum {
int x
int y
}
main {
const int n ← 42
const value scalar ← n ↦ value
print scalar
const bytes bytes ← |de ad|
const value boxedBytes ← bytes ↦ value
print boxedBytes
const list<int> xs ← [1, 2]
const value boxedList ← xs ↦ value
print boxedList
const map<string, int> scores ← { "alpha": 10 }
const value boxedMap ← scores ↦ value
print boxedMap
const Punctum pt ← Punctum { x = 3, y = 4 }
const value boxedGenus ← pt ↦ value
print boxedGenus
const tensor<int, [2]> grid ← [5, 6] ↦ tensor<int, [2]>
const value boxedTensor ← grid ↦ value
print boxedTensor
}Expected output:
42
[222, 173]
[1, 2]
{"alpha": 10}
{"x": 3, "y": 4}
[5, 6]
radix/corpus/conversio/valor-genus.fab (canonical · conversio)#
valor ↦ genus extraction with missing-field defaults and mandatory-field failure via ⇥ recovery.
# =============================================================================
# valor — valor ↦ genus extraction with missing-field defaults and mandatory-field failure via ⇥ recovery.
# =============================================================================
#
# What this teaches:
# • JSON-to-struct deserialization — `valor ↦ genus` deserializes JSON objects into typed genus records.
# • Field policies — missing `sponte` fields zero-initialize; missing mandatory fields fail at runtime (recoverable via `⇥`); extra JSON keys are ignored.
#
# Common mistakes:
# • Omitting a mandatory field from the JSON and expecting a default value — only `sponte` or default-valued fields are optional; missing mandatory fields fail at runtime.
#
# See also: ↦, ⇥
# =============================================================================
# conversio — valor to genus extraction
#
# WHY: `valor ↦ genus` deserializes JSON objects into typed records. Missing
# defaultable fields zero-initialize; missing mandatory fields fail at runtime
# (recoverable via `⇥`). Extra JSON keys are ignored.
class Persona {
string nomen
int aetas optional
string regio = "Roma"
instant born
}
main {
const value payload ← {
"nomen": "Marcus",
"born": "1979-05-27T07:32:00Z",
"extra": "ignored"
} ↦ value
const Persona good ← payload ↦ Persona
assert good.nomen ≡ "Marcus"
assert good.aetas ≡ null
assert good.regio ≡ "Roma"
const value stale ← { "nomen": "Livia" } ↦ value
const Persona recovered ← stale ↦ Persona ⇥ good
assert recovered.nomen ≡ "Marcus"
const value boxed ← recovered ↦ value
const Persona roundtrip ← boxed ↦ Persona
assert roundtrip.nomen ≡ "Marcus"
assert roundtrip.regio ≡ "Roma"
print roundtrip.nomen
print roundtrip.regio
print roundtrip.born ↦ string
}Expected output:
Marcus
Roma
1979-05-27T07:32:00Z
radix/corpus/conversio/valor-scalaria.fab (canonical · conversio)#
Scalar valor ↦ T extraction via FromValor (variant match, fractus widen, textus|instans wire).
# =============================================================================
# valor — Scalar valor ↦ T extraction via FromValor (variant match, fractus widen, textus|instans wire).
# =============================================================================
#
# What this teaches:
# • Scalar extraction — `valor ↦ T` extracts typed values from dynamic JSON carriers using variant matching.
# • Widening — `valor ↦ fractus` widens `Numerus` variants losslessly.
# • Wire text — `valor ↦ textus` accepts both `Textus` and `Instans` wire strings.
# • Recovery — `⇥` provides a fallback on variant mismatch.
#
# Common mistakes:
# • Assuming `valor ↦ textus` works for non-text valor variants — only Textus and Instans wire strings are accepted; other variants fail without `⇥` recovery.
#
# See also: ↦, ⇥, instans, textus
# =============================================================================
# conversio — scalar valor extraction
#
# WHY: `valor ↦ T` is the default runtime extraction for dynamic JSON carriers.
# Scalar arms match `Valor` variants; `valor ↦ fractus` widens `Numerus` losslessly;
# `valor ↦ textus` accepts `Textus` and `Instans` wire strings. Typed datetime
# provenance stays on `valor ↦ instans` (see conversio/instans.fab). `⇥`
# recovers on variant mismatch.
main {
const value asInt ← 42
const int count ← asInt ↦ int
assert count ≡ 42
const value asFloat ← 3.5
const float ratio ← asFloat ↦ float
assert ratio ≡ 3.5
const value intForFloat ← 7
const float widened ← intForFloat ↦ float
assert widened ≡ 7.0
const value asBool ← true
const bool flag ← asBool ↦ bool
assert flag ≡ true
const value asText ← "salve"
const string greeting ← asText ↦ string
assert greeting ≡ "salve"
const value asWire ← "1979-05-27T07:32:00Z"
const string wire ← asWire ↦ string
assert wire ≡ "1979-05-27T07:32:00Z"
const value asAscii ← 'yes'
const ascii token ← asAscii ↦ ascii
assert token ≡ 'yes'
const value bad ← "not-a-number"
const int recovered ← bad ↦ int ⇥ 0
assert recovered ≡ 0
print count
print ratio
print widened
print flag
print greeting
print wire
print token
print recovered
}Expected output:
42
3.5
7.0
verum
salve
1979-05-27T07:32:00Z
yes
0
radix/corpus/conversio/valor-tensor.fab (canonical · conversio)#
Compose valor ↔ tensor roundtrip via lista bridges (no dedicated valor↔tensor arms).
# =============================================================================
# valor — Compose valor ↔ tensor roundtrip via lista bridges (no dedicated valor↔tensor arms).
# =============================================================================
#
# What this teaches:
# • Indirect tensor conversion — `valor ↔ tensor` has no dedicated codegen arms; it materializes through `lista<T>` as an intermediate step.
# • Roundtrip path — valor → lista → tensor → lista → valor, showing composition of existing operators.
#
# Common mistakes:
# • Expecting `valor ↦ tensor` to work directly without the lista bridge — there are no dedicated valor↔tensor arms; compose through `lista<T>` instead.
#
# See also: ↦, valor, lista, tensor
# =============================================================================
# conversio — valor ↔ tensor compose roundtrip
#
# WHY: `valor ↔ tensor` has no dedicated codegen arms. Extraction materializes
# `lista<T>` first; construction uses shipped `lista ↦ tensor` (`structa`) and
# flatten via `tensor ↦ lista` (`.planata()`), then `lista ↦ valor` boxing.
main {
const value arr ← [1, 2, 3, 4]
const list<int> xs ← arr ↦ list<int>
assert xs.longitudo() ≡ 4
const tensor<int, [4]> grid ← xs ↦ tensor<int, [4]>
const list<int> flat ← grid ↦ list<int>
assert flat.longitudo() ≡ 4
const value roundtrip ← flat ↦ value
print roundtrip
const value obj ← { "alpha": 10, "beta": 20 } ↦ value
const map<string, int> scores ← obj ↦ map<string, int>
print scores.accipe("alpha") coalesce 0
}Expected output:
[1, 2, 3, 4]
10
radix/corpus/destructura/literal.fab (canonical · existing-home)#
JSON-shaped dynamic value literal for open object-shaped data.
# =============================================================================
# valor — JSON-shaped dynamic value literal for open object-shaped data.
# =============================================================================
#
# What this teaches:
# • JSON valor literals — `{ "key": value, ... }` creates dynamic valor objects using JSON5 syntax with trailing commas.
# • Nested objects — JSON valor literals can be nested for complex data shapes.
# • Constraint — JSON valor literals accept only constant values (strings, numbers, booleans, null, nested objects/arrays); use genus or tabula for variable-backed construction.
#
# Common mistakes:
# • Using retired bare object literals `{ key = expr }` instead of genus construction `Type { field = expr }` — bare `{ }` is now a JSON valor literal with quoted keys and `:` separator.
#
# See also: genus, ∷, ignotum, tabula
# =============================================================================
# destructura — valor literal expressions (inline JSON)
#
# { "clavis": expr, ... } -- JSON object literal (valor)
# { "clavis": expr, "nidum": { ... } } -- nested JSON objects
#
# Anonymous Faber object literals (`{ key = expr }`) are retired. Bare `{ }`
# now denotes a JSON valor literal: keys are quoted JSON strings separated by
# `:`, values are JSON scalars, arrays, or nested objects. Trailing commas are
# permitted (JSON5-style). Duplicate keys are an error (second occurrence).
#
# GRAMMAR:
# jsonLiteral :← '{' (jsonMember (',' jsonMember)* ','?)? '}'
# jsonMember :← string ':' jsonValue
#
# EXPECTED OUTPUT:
# Empty valor, point coords, keyed fields, nested records.
#
# BACKEND: Go emitter does not lower object `sparge` into maps (whitelist:
# destructura/literal.fab).
main {
# --- Empty and simple records ---
const _ void ← {}
print void
const _ punctum ← { "x": 10, "y": 20 }
print punctum
# Text keys and constant values
const _ forma ← { "clavis": 42 }
print forma
# NOTE: JSON valor literals accept only constant values (strings, numbers,
# booleans, null, nested objects/arrays). For variable-backed field
# construction, use genus `Type { field = expr }` or tabula insertion.
# --- Nested valor ---
const _ nidum ← { "extra": { "medium": 1 } }
print nidum
}