1 files changed, 45 insertions, 0 deletions
diff --git a/src/lib/core/common.ts b/src/lib/core/common.ts
new file mode 100644
index 0000000..1283000
--- /dev/null
+++ b/src/lib/core/common.ts
@@ -0,0 +1,45 @@
+export enum TokenType {
+  OPEN_PAREN = "(",
+  CLOSE_PAREN = ")",
+  SPACE = " ",
+  SEMICOLON = ";",
+  COMMA = ",",
+  UNIQUE_SYMBOL = "UNIQUE_SYMBOL",
+}
+
+export type Token<
+  Type extends TokenType = TokenType,
+  Name extends string = string
+> = {
+  type: Type;
+  name: Name;
+};
+
+export type LexerCtx = {
+  next: string;
+  nameCollection: string;
+  tokens: readonly Token[];
+};
+
+export enum NodeType {
+  ROOT = "ROOT",
+  LITERAL = "LITERAL",
+  CALL = "CALL",
+  PARSER_ERROR = "PARSER_ERROR",
+}
+
+export type ASTNode<
+  Type extends NodeType = NodeType,
+  Name extends string = string,
+  Children extends ASTNode[] = ASTNode<NodeType, string, any>[]
+> = {
+  type: Type;
+  name: Name;
+  children: Children;
+};
+
+export type ParserCtx = {
+  remainingTokens: readonly Token[];
+  lastName: string | null;
+  stack: readonly ASTNode[];
+};