Flyology JSON API reference

Description

Converts and renders one signed integer type without allocation.

Parse

procedure Parse (Lexeme : Ada.Streams.Stream_Element_Array; Result : out Parse_Result)

Parse accepts only a complete strict JSON integer spelling. Fractions and exponents are invalid syntax, -0 converts to zero, and range is detected before arithmetic overflow. No failure publishes a Value.

Parameters

Lexeme: Complete exact number-token octets with arbitrary Ada array bounds.
Result: Definite conversion result; its value is eligible only after Converted.

Parse_Result

type Parse_Result is record
   Status : Parse_Status;
   Value  : Value_Type;
end record;

Definite so a constrained out actual cannot fail copy-out. Value is eligible only when Status = Converted; otherwise it remains a valid but unspecified Value_Type value.

Record fields

Status: Conversion outcome that controls whether Value is eligible.
Value: Converted integer when Status is Converted; otherwise unspecified.

Parse_Status

type Parse_Status is (Converted, Invalid_Syntax, Below_Range, Above_Range);

Result category for conversion of one complete strict JSON integer lexeme.

Enumeration literals

Converted: Conversion succeeded and the result value is eligible.
Invalid_Syntax: The lexeme is not a complete strict JSON integer spelling.
Below_Range: The mathematical integer is less than Value_Type'First.
Above_Range: The mathematical integer is greater than Value_Type'Last.

Render

procedure Render
  (Value    : Value_Type;
   Output   : in out Ada.Streams.Stream_Element_Array;
   Produced : out Ada.Streams.Stream_Element_Count;
   Status   : out Numbers.Render_Status)

Render emits exact base ten without a leading zero, exponent, or plus. On insufficient capacity it returns Produced = 0 and leaves Output unchanged. This integer operation never returns Unsupported_Value.

Parameters

Value: Signed integer to render.
Output: Caller storage that receives the complete spelling on success.
Produced: Number of octets written from Output'First, or zero on failure.
Status: Rendering outcome that controls whether the output prefix is published.

Value_Type

type Value_Type is range <>;

Signed integer type converted and rendered without rounding or truncation.