1 files changed, 79 insertions, 0 deletions
diff --git a/packages/frontend/src/scripts/hpml/expr.ts b/packages/frontend/src/scripts/hpml/expr.ts
new file mode 100644
index 0000000000..18c7c2a14b
--- /dev/null
+++ b/packages/frontend/src/scripts/hpml/expr.ts
@@ -0,0 +1,79 @@
+import { literalDefs, Type } from '.';
+
+export type ExprBase = {
+	id: string;
+};
+
+// value
+
+export type EmptyValue = ExprBase & {
+	type: null;
+	value: null;
+};
+
+export type TextValue = ExprBase & {
+	type: 'text';
+	value: string;
+};
+
+export type MultiLineTextValue = ExprBase & {
+	type: 'multiLineText';
+	value: string;
+};
+
+export type TextListValue = ExprBase & {
+	type: 'textList';
+	value: string;
+};
+
+export type NumberValue = ExprBase & {
+	type: 'number';
+	value: number;
+};
+
+export type RefValue = ExprBase & {
+	type: 'ref';
+	value: string; // value is variable name
+};
+
+export type AiScriptRefValue = ExprBase & {
+	type: 'aiScriptVar';
+	value: string; // value is variable name
+};
+
+export type UserFnValue = ExprBase & {
+	type: 'fn';
+	value: UserFnInnerValue;
+};
+type UserFnInnerValue = {
+	slots: {
+		name: string;
+		type: Type;
+	}[];
+	expression: Expr;
+};
+
+export type Value =
+	EmptyValue | TextValue | MultiLineTextValue | TextListValue | NumberValue | RefValue | AiScriptRefValue | UserFnValue;
+
+export function isLiteralValue(expr: Expr): expr is Value {
+	if (expr.type == null) return true;
+	if (literalDefs[expr.type]) return true;
+	return false;
+}
+
+// call function
+
+export type CallFn = ExprBase & { // "fn:hoge" or string
+	type: string;
+	args: Expr[];
+	value: null;
+};
+
+// variable
+export type Variable = (Value | CallFn) & {
+	name: string;
+};
+
+// expression
+export type Expr = Variable | Value | CallFn;