Eval evaluates the given AST.

GetTokenName returns the name of the token given its value.

LogParseError reports in stderr an error encountered during parsing.

PrintRuntimeError reports a runtime error.

MakeParseError renders a parsing error as a string.

MakeRuntimeError creates a new runtime error.

New creates a new environment.

NewEnvironment creates a new local environment.

NewGlobal creates a new global environment.

NewParser creates a new parser.

NewUserFunction creates a new UserFunction.

HadParseError is true if a scanner/parser error was encountered.

HadRuntimeError is true if an evaluation error was encountered.

Assign is used for variable assignment name = value.

Binary is used for binary operators.

Block is a curly-braced block statement that defines a local scope { ..

Call is the node of a function call.

Environment associates variables to values.

Expression statement.

Function is the function definition node.

Grouping is used for parenthesized expressions.

If is the classic if statement.

Literal values.

Logical is used for "or" and "and" operators.

NativeFunction is a builtin Lox function.

Parser will transform an array of tokens to an AST.

Print statement print 1 + 2.

Return is used to return from a function.

Token contains the lexeme read by the scanner.

Unary is used for unary operators.

UserFunction are functions defined in Lox code.

Var is the variable declaration statement var <name> = <initializer>.

Variable access expression print x.

While is the classic while statement.

Callable is the generic interface for functions/classes in Lox.

Expr is the root class of expression nodes.

Node is the root class of AST nodes.

Stmt form a second hierarchy of syntax nodes independent of expressions.

Type is the type of the token given as a string.