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Add elm list encoders/decoders #686

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merged 3 commits into from
Oct 16, 2023
Merged

Add elm list encoders/decoders #686

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7d073a9
Add elm list encoders/decoders
mbryzek Oct 15, 2023
c83d56e
wip
mbryzek Oct 15, 2023
f281d4e
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mbryzek Oct 16, 2023
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129 changes: 77 additions & 52 deletions elm-generator/src/main/scala/generator/elm/ElmModel.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -40,17 +40,51 @@ case class ElmModel(args: GenArgs) {
s"type alias ${Names.pascalCase(model.name)} =",
" {",
model.fields.map { f =>
val opt = if (f.required) {
""
} else {
"Maybe "
def maybe(contents: String): String = {
if (f.required) {
contents
} else {
maybeWrapInParens("Maybe", contents)
}
}
s"${Names.camelCase(f.name)}: $opt${elmType.lookup(f.`type`)}"

s"${Names.camelCase(f.name)}: ${maybe(elmType.lookup(f.`type`))}"
}.mkString("\n, ").indent(4).stripTrailing(),
" }"
).mkString("\n")
}

private[this] def maybeWrapInParens(function: String, contents: String): String = {
val i = contents.indexOf(" ")
if (i > 0) {
s"$function ($contents)"
} else {
s"$function $contents"
}
}

private[this] def genEncoderForDatatype(m: Model, f: Field, v: Datatype): String = {
v match {
case p: Datatype.Primitive => primitiveEncoder(p)
case u: UserDefined => {
Names.camelCase(args.imports, u.name) + "Encoder"
}
case m: Generated.Model => {
Names.camelCase(args.imports, m.name) + "Encoder"
}
case u: Container.List => {
args.imports.addAs("Json.Encode", "Encode")
s"(Encode.list ${genEncoderForDatatype(m, f, u.inner)})"
}
case u: Container.Option => {
todo(s"model ${m.name} Field ${f.name} has type option: ${u.name}")
}
case u: Container.Map => {
todo(s"model ${m.name} Field ${f.name} has type map: ${u.name}")
}
}
}


private[this] def genEncoder(m: Model): ElmFunction = {
args.imports.addAs("Json.Encode", "Encode")
Expand All @@ -60,22 +94,12 @@ case class ElmModel(args: GenArgs) {
"[",
m.fields.zipWithIndex.map { case (f, i) =>
val encoder = args.datatypeResolver.parse(f.`type`) match {
case Success(v) => v match {
case p: Datatype.Primitive => fieldEncoder(f, primitiveEncoder(p))
case u: UserDefined => {
fieldEncoder(f, Names.camelCase(args.imports, u.name) + "Encoder")
}
case m: Generated.Model => {
fieldEncoder(f, Names.camelCase(args.imports, m.name) + "Encoder")
}
case u: Container.List => {
todo(s"model ${m.name} Field ${f.name} has type list: ${u.name}")
}
case u: Container.Option => {
todo(s"model ${m.name} Field ${f.name} has type option: ${u.name}")
}
case u: Container.Map => {
todo(s"model ${m.name} Field ${f.name} has type map: ${u.name}")
case Success(v) => {
val encoder = genEncoderForDatatype(m, f, v)
if (f.required) {
s"""( ${Names.wrapInQuotes(f.name)}, $encoder instance.${Names.camelCase(f.name)} )"""
} else {
s"""( ${Names.wrapInQuotes(f.name)}, encodeOptional $encoder instance.${Names.camelCase(f.name)} )"""
}
}
case Failure(ex) => throw ex
Expand All @@ -95,7 +119,7 @@ case class ElmModel(args: GenArgs) {
args.imports.addAs("Json.Encode", "Encode")
import Datatype.Primitive._
p match {
case Boolean => "Encode.boolean"
case Boolean => "Encode.bool"
case Double => "Encode.float"
case Integer => "Encode.int"
case Long => "Encode.int"
Expand All @@ -110,58 +134,59 @@ case class ElmModel(args: GenArgs) {
}
}

private[this] def fieldEncoder(f: Field, encoder: String): String = {
if (f.required) {
s"""( ${Names.wrapInQuotes(f.name)}, $encoder instance.${Names.camelCase(f.name)} )"""
} else {
s"""( ${Names.wrapInQuotes(f.name)}, encodeOptional $encoder instance.${Names.camelCase(f.name)} )"""
}
}

private[this] def genDecoder(m: Model): ElmFunction = {
elmJson.decoder(m.name) {
Seq(
s"Decode.succeed ${Names.pascalCase(m.name)}",
m.fields.map { f =>
modelFieldDecoder(m, f)
val decoder = modelFieldDecoder(m, f)
pipelineDecoder(f, decoder)
}.mkString("\n").indent(4)
).mkString("\n").indent(4)
}
}

private[this] def fieldDecoder(f: Field, decoder: String): String = {
private[this] def pipelineDecoder(f: Field, decoder: String): String = {
args.imports.addAs("Json.Decode.Pipeline", "Pipeline")

if (f.required) {
s"""|> Pipeline.required ${Names.wrapInQuotes(f.name)} $decoder"""
} else {
args.imports.addAs("Json.Decode", "Decode")
s"""|> Pipeline.optional ${Names.wrapInQuotes(f.name)} (Decode.nullable $decoder) Nothing"""
val nullDecoder = maybeWrapInParens("Decode.nullable", decoder)
s"""|> Pipeline.optional ${Names.wrapInQuotes(f.name)} ($nullDecoder) Nothing"""
}
}

private[this] def modelFieldDecoder(m: Model, f: Field): String = {
args.datatypeResolver.parse(f.`type`) match {
case Success(v) => v match {
case p: Datatype.Primitive => fieldDecoder(f, primitiveDecoder(p))
case u: UserDefined => {
fieldDecoder(f, Names.camelCase(args.imports, u.name) + "Decoder")
}
case m: Generated.Model => {
fieldDecoder(f, Names.camelCase(args.imports, m.name) + "Decoder")
}
case u: Container.List => {
todo(s"model ${m.name} Field ${f.name} has type list: ${u.name}")
}
case u: Container.Option => {
todo(s"model ${m.name} Field ${f.name} has type option: ${u.name}")
}
case u: Container.Map => {
todo(s"model ${m.name} Field ${f.name} has type map: ${u.name}")
}
}
case Success(v) => genDecoderForDatatype(m, f, v)
case Failure(ex) => throw ex
}
}

private[this] def genDecoderForDatatype(m: Model, f: Field, v: Datatype): String = {
v match {
case p: Datatype.Primitive => primitiveDecoder(p)
case u: UserDefined => {
Names.camelCase(args.imports, u.name) + "Decoder"
}
case m: Generated.Model => {
Names.camelCase(args.imports, m.name) + "Decoder"
}
case u: Container.List => {
args.imports.addAs("Json.Decode", "Decode")
"(" + maybeWrapInParens("Decode.list", genDecoderForDatatype(m, f, u.inner)) + ")"
}
case u: Container.Option => {
todo(s"model ${m.name} Field ${f.name} has type option: ${u.name}")
}
case u: Container.Map => {
todo(s"model ${m.name} Field ${f.name} has type map: ${u.name}")
}
}
}

private[this] def todo(msg: String): Nothing = {
sys.error(s"The elm generator does not yet support this type: $msg")
}
Expand All @@ -170,7 +195,7 @@ case class ElmModel(args: GenArgs) {
args.imports.addAs("Json.Decode", "Decode")
import Datatype.Primitive._
p match {
case Boolean => "Decode.boolean"
case Boolean => "Decode.bool"
case Double => "Decode.float"
case Integer => "Decode.int"
case Long => "Decode.int"
Expand Down
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