Module Ast_iterator

module Ast_iterator: sig .. end

Ast_iterator.iterator enables AST inspection using open recursion. A typical mapper would be based on Ast_iterator.default_iterator, a trivial iterator, and will fall back on it for handling the syntax it does not modify.

Warning: this module is unstable and part of compiler-libs.

A generic Parsetree iterator

type iterator = {

	`attribute : iterator -> Parsetree.attribute -> unit;`
	`attributes : iterator -> Parsetree.attribute list -> unit;`
	`binding_op : iterator -> Parsetree.binding_op -> unit;`
	`case : iterator -> Parsetree.case -> unit;`
	`cases : iterator -> Parsetree.case list -> unit;`
	`class_declaration : iterator -> Parsetree.class_declaration -> unit;`
	`class_description : iterator -> Parsetree.class_description -> unit;`
	`class_expr : iterator -> Parsetree.class_expr -> unit;`
	`class_field : iterator -> Parsetree.class_field -> unit;`
	`class_signature : iterator -> Parsetree.class_signature -> unit;`
	`class_structure : iterator -> Parsetree.class_structure -> unit;`
	`class_type : iterator -> Parsetree.class_type -> unit;`
	`class_type_declaration : iterator -> Parsetree.class_type_declaration -> unit;`
	`class_type_field : iterator -> Parsetree.class_type_field -> unit;`
	`constructor_declaration : iterator -> Parsetree.constructor_declaration -> unit;`
	`directive_argument : iterator -> Parsetree.directive_argument -> unit;`
	`expr : iterator -> Parsetree.expression -> unit;`
	`extension : iterator -> Parsetree.extension -> unit;`
	`extension_constructor : iterator -> Parsetree.extension_constructor -> unit;`
	`include_declaration : iterator -> Parsetree.include_declaration -> unit;`
	`include_description : iterator -> Parsetree.include_description -> unit;`
	`label_declaration : iterator -> Parsetree.label_declaration -> unit;`
	`location : iterator -> Location.t -> unit;`
	`module_binding : iterator -> Parsetree.module_binding -> unit;`
	`module_declaration : iterator -> Parsetree.module_declaration -> unit;`
	`module_substitution : iterator -> Parsetree.module_substitution -> unit;`
	`module_expr : iterator -> Parsetree.module_expr -> unit;`
	`module_type : iterator -> Parsetree.module_type -> unit;`
	`module_type_declaration : iterator -> Parsetree.module_type_declaration -> unit;`
	`open_declaration : iterator -> Parsetree.open_declaration -> unit;`
	`open_description : iterator -> Parsetree.open_description -> unit;`
	`pat : iterator -> Parsetree.pattern -> unit;`
	`payload : iterator -> Parsetree.payload -> unit;`
	`signature : iterator -> Parsetree.signature -> unit;`
	`signature_item : iterator -> Parsetree.signature_item -> unit;`
	`structure : iterator -> Parsetree.structure -> unit;`
	`structure_item : iterator -> Parsetree.structure_item -> unit;`
	`toplevel_directive : iterator -> Parsetree.toplevel_directive -> unit;`
	`toplevel_phrase : iterator -> Parsetree.toplevel_phrase -> unit;`
	`typ : iterator -> Parsetree.core_type -> unit;`
	`row_field : iterator -> Parsetree.row_field -> unit;`
	`object_field : iterator -> Parsetree.object_field -> unit;`
	`type_declaration : iterator -> Parsetree.type_declaration -> unit;`
	`type_extension : iterator -> Parsetree.type_extension -> unit;`
	`type_exception : iterator -> Parsetree.type_exception -> unit;`
	`type_kind : iterator -> Parsetree.type_kind -> unit;`
	`value_binding : iterator -> Parsetree.value_binding -> unit;`
	`value_description : iterator -> Parsetree.value_description -> unit;`
	`with_constraint : iterator -> Parsetree.with_constraint -> unit;`

}

A iterator record implements one "method" per syntactic category, using an open recursion style: each method takes as its first argument the iterator to be applied to children in the syntax tree.

val default_iterator : iterator

A default iterator, which implements a "do not do anything" mapping.