try an SDK and a manually defined lang

I don't think I like the SDK way, and langV2 seems to be so simialr to
V1 that I'm probably going to stick with V1 for now and see if i can get
it to do what I need.

langV2/lang.go

@@ -0,0 +1,79 @@
+package langV2
+
+import (
+	participle "github.com/alecthomas/participle/v2"
+)
+
+// Root AST node containing all definitions
+type AST struct {
+	Definitions []Definition `parser:"@@*"`
+}
+
+type Definition struct {
+	Entity    *EntityDef    `parser:"@@"`
+	Server    *ServerDef    `parser:"| @@"`
+	Page      *PageDef      `parser:"| @@"`
+	Component *ComponentDef `parser:"| @@"`
+}
+
+type EntityDef struct {
+	Name   string  `parser:"'entity' @Ident"`
+	Fields []Field `parser:"'{' @@* '}'"`
+}
+
+type Field struct {
+	Name         string        `parser:"@Ident ':'"`
+	Type         string        `parser:"@Ident"`
+	Required     bool          `parser:"@'required'?"`
+	Unique       bool          `parser:"@'unique'?"`
+	Index        bool          `parser:"@'indexed'?"`
+	Default      *string       `parser:"('default' @String)?"`
+	Validations  []Validation  `parser:"@@*"`
+	Relationship *Relationship `parser:"@@?"`
+}
+
+type Validation struct {
+	Type  string  `parser:"'validate' @Ident"`
+	Value *string `parser:"@String?"`
+}
+
+type Relationship struct {
+	Type        string  `parser:"'relates' 'to' @Ident"`
+	Cardinality string  `parser:"'as' @('one' | 'many')"`
+	ForeignKey  *string `parser:"('via' @String)?"`
+}
+
+type ServerDef struct {
+	Name      string        `parser:"'server' @Ident"`
+	Endpoints []EndpointDef `parser:"'{' @@* '}'"`
+}
+
+type EndpointDef struct {
+	Method    string `parser:"@('GET'|'POST'|'PUT'|'DELETE')"`
+	Path      string `parser:"@String"`
+	EntityRef string `parser:"'entity' @Ident"`
+}
+
+type ComponentDef struct {
+	EntityRef string `parser:"@Ident"`
+	ServerRef string `parser:"('from' @Ident)?"`
+}
+
+type PageDef struct {
+	Name       string         `parser:"'page' @Ident"`
+	Components []ComponentDef `parser:"'{' @@* '}'"`
+}
+
+func ParseInput(input string) (AST, error) {
+	parser, err := participle.Build[AST](
+		participle.Unquote("String"),
+	)
+	if err != nil {
+		return AST{}, err
+	}
+	ast, err := parser.ParseString("", input)
+	if err != nil {
+		return AST{}, err
+	}
+	return *ast, nil
+}