module Hydra.Impl.Haskell.Sources.Ext.Yaml.Model where

import Hydra.Impl.Haskell.Sources.Core

import Hydra.Kernel
import Hydra.Impl.Haskell.Dsl.Types as Types
import Hydra.Impl.Haskell.Dsl.Standard


yamlModelModule :: Module Meta
yamlModelModule = Module ns elements [] $
    Just ("A basic YAML representation model. Based on:\n" ++
      "  https://yaml.org/spec/1.2/spec.html\n" ++
      "The Serialization and Presentation properties of YAML,\n" ++
      "including directives, comments, anchors, style, formatting, and aliases, are not supported by this model.\n" ++
      "In addition, tags are omitted from this model, and non-standard scalars are unsupported.")
  where
    ns = Namespace "hydra/ext/yaml/model"
    def = datatype ns
    model = nsref ns

    elements = [
      {-
      Every YAML node has an optional scalar tag or non-specific tag (omitted from this model)
      -}
      def "Node" $
        doc "A YAML node (value)" $
        union [
          "mapping">: Types.map (model "Node") (model "Node"), -- Failsafe schema: tag:yaml.org,2002:map
          "scalar">: model "Scalar",
          "sequence">: list $ model "Node"], -- Failsafe schema: tag:yaml.org,2002:seq

      def "Scalar" $
        doc "A union of scalars supported in the YAML failsafe and JSON schemas. Other scalars are not supported here" $
        union [
          {-
          Represents a true/false value

          JSON schema: tag:yaml.org,2002:bool
          -}
          "bool">:
            doc "Represents a true/false value"
            boolean,
          {-
          Represents an approximation to real numbers

          JSON schema: tag:yaml.org,2002:float

          In addition to arbitrary-precision floating-point numbers in scientific notation,
          YAML allows for three special values, which are not supported here:
          positive and negative infinity (.inf and -.inf), and "not a number (.nan)
          -}
          "float">:
            doc "Represents an approximation to real numbers"
            bigfloat,
          {-
          Represents arbitrary sized finite mathematical integers

          JSON schema: tag:yaml.org,2002:int
          -}
          "int">:
            doc "Represents arbitrary sized finite mathematical integers"
            bigint,
          {-
          Represents the lack of a value

          JSON schema: tag:yaml.org,2002:null
          -}
          "null">:
            doc "Represents the lack of a value"
            unit,
          {-
          Failsafe schema: tag:yaml.org,2002:str
          -}
          "str">:
            doc "A string value"
            string]]