/
from_yaml.cr
299 lines (244 loc) · 6.78 KB
/
from_yaml.cr
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def Object.from_yaml(string_or_io : String | IO) : self
new(YAML::ParseContext.new, parse_yaml(string_or_io))
end
def Array.from_yaml(string_or_io : String | IO)
new(YAML::ParseContext.new, parse_yaml(string_or_io)) do |element|
yield element
end
end
private def parse_yaml(string_or_io)
document = YAML::Nodes.parse(string_or_io)
# If the document is empty we simulate an empty scalar with
# plain style, that parses to Nil
document.nodes.first? || begin
scalar = YAML::Nodes::Scalar.new("")
scalar.style = YAML::ScalarStyle::PLAIN
scalar
end
end
private def parse_scalar(ctx, node, type : T.class) forall T
ctx.read_alias(node, T) do |obj|
return obj
end
if node.is_a?(YAML::Nodes::Scalar)
value = YAML::Schema::Core.parse_scalar(node)
if value.is_a?(T)
ctx.record_anchor(node, value)
value
else
node.raise "Expected #{T}, not #{node.value}"
end
else
node.raise "Expected #{T}, not #{node.class.name}"
end
end
def Nil.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)
parse_scalar(ctx, node, self)
end
def Bool.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)
parse_scalar(ctx, node, self)
end
{% for type in %w(Int8 Int16 Int32 Int64 UInt8 UInt16 UInt32 UInt64) %}
def {{type.id}}.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)
{{type.id}}.new! parse_scalar(ctx, node, Int64)
end
{% end %}
def String.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)
ctx.read_alias(node, String) do |obj|
return obj
end
if node.is_a?(YAML::Nodes::Scalar)
value = node.value
ctx.record_anchor(node, value)
value
else
node.raise "Expected String, not #{node.class.name}"
end
end
def Float32.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)
parse_scalar(ctx, node, Float64).to_f32!
end
def Float64.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)
parse_scalar(ctx, node, self)
end
def Array.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)
ctx.read_alias(node, self) do |obj|
return obj
end
ary = new
ctx.record_anchor(node, ary)
new(ctx, node) do |element|
ary << element
end
ary
end
def Array.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)
unless node.is_a?(YAML::Nodes::Sequence)
node.raise "Expected sequence, not #{node.class}"
end
node.each do |value|
yield T.new(ctx, value)
end
end
def Set.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)
ctx.read_alias(node, self) do |obj|
return obj
end
ary = new
ctx.record_anchor(node, ary)
new(ctx, node) do |element|
ary << element
end
ary
end
def Set.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)
unless node.is_a?(YAML::Nodes::Sequence)
node.raise "Expected sequence, not #{node.class}"
end
node.each do |value|
yield T.new(ctx, value)
end
end
def Hash.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)
ctx.read_alias(node, self) do |obj|
return obj
end
hash = new
ctx.record_anchor(node, hash)
new(ctx, node) do |key, value|
hash[key] = value
end
hash
end
def Hash.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)
unless node.is_a?(YAML::Nodes::Mapping)
node.raise "Expected mapping, not #{node.class}"
end
YAML::Schema::Core.each(node) do |key, value|
yield K.new(ctx, key), V.new(ctx, value)
end
end
def Tuple.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)
unless node.is_a?(YAML::Nodes::Sequence)
node.raise "Expected sequence, not #{node.class}"
end
if node.nodes.size != {{T.size}}
node.raise "Expected #{{{T.size}}} elements, not #{node.nodes.size}"
end
{% begin %}
Tuple.new(
{% for i in 0...T.size %}
(self[{{i}}].new(ctx, node.nodes[{{i}}])),
{% end %}
)
{% end %}
end
def NamedTuple.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)
unless node.is_a?(YAML::Nodes::Mapping)
node.raise "Expected mapping, not #{node.class}"
end
{% begin %}
{% for key in T.keys %}
%var{key.id} = nil
{% end %}
YAML::Schema::Core.each(node) do |key, value|
key = String.new(ctx, key)
case key
{% for key, type in T %}
when {{key.stringify}}
%var{key.id} = {{type}}.new(ctx, value)
{% end %}
end
end
{% for key in T.keys %}
if %var{key.id}.nil?
node.raise "Missing yaml attribute: {{key}}"
end
{% end %}
{
{% for key in T.keys %}
{{key}}: %var{key.id},
{% end %}
}
{% end %}
end
def Enum.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)
unless node.is_a?(YAML::Nodes::Scalar)
node.raise "Expected scalar, not #{node.class}"
end
string = node.value
if value = string.to_i64?
from_value(value)
else
parse(string)
end
end
def Union.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)
if node.is_a?(YAML::Nodes::Alias)
{% for type in T %}
{% if type < ::Reference %}
ctx.read_alias?(node, {{type}}) do |obj|
return obj
end
{% end %}
{% end %}
node.raise("Error deserailizing alias")
end
{% begin %}
# String must come last because anything can be parsed into a String.
# So, we give a chance first to types in the union to be parsed.
{% string_type = T.find { |type| type == ::String } %}
{% for type in T %}
{% unless type == string_type %}
begin
return {{type}}.new(ctx, node)
rescue YAML::ParseException
# Ignore
end
{% end %}
{% end %}
{% if string_type %}
begin
return {{string_type}}.new(ctx, node)
rescue YAML::ParseException
# Ignore
end
{% end %}
{% end %}
node.raise "Couldn't parse #{self}"
end
def Time.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)
parse_scalar(ctx, node, Time)
end
struct Time::Format
def from_yaml(ctx : YAML::ParseContext, node : YAML::Nodes::Node) : Time
unless node.is_a?(YAML::Nodes::Scalar)
node.raise "Expected scalar, not #{node.class}"
end
parse(node.value, Time::Location::UTC)
end
end
module Time::EpochConverter
def self.from_yaml(ctx : YAML::ParseContext, node : YAML::Nodes::Node) : Time
unless node.is_a?(YAML::Nodes::Scalar)
node.raise "Expected scalar, not #{node.class}"
end
Time.unix(node.value.to_i)
end
end
module Time::EpochMillisConverter
def self.from_yaml(ctx : YAML::ParseContext, node : YAML::Nodes::Node) : Time
unless node.is_a?(YAML::Nodes::Scalar)
node.raise "Expected scalar, not #{node.class}"
end
Time.unix_ms(node.value.to_i64)
end
end
struct Slice
def self.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)
{% if T != UInt8 %}
{% raise "Can only deserialize Slice(UInt8), not #{@type}}" %}
{% end %}
parse_scalar(ctx, node, self)
end
end