Creates a syntax tree corresponding to an Erlang term.

Term must be a literal term, that is, one that can be represented as a source code literal. Thus, it may not contain a process identifier, port, reference, binary or function value as a subterm.

Note: This is a constant time operation.

See also: ann_abstract/2, concrete/1, is_literal/1, is_literal_term/1.

Appends Annotations to the list of user annotations of Node.

Note: this is equivalent to set_ann(Node, Annotations ++ get_ann(Node)), but potentially more efficient.

See also: get_ann/1, set_ann/2.

Returns the pattern subtree of an abstract pattern alias.

See also: c_alias/2.

Returns the variable subtree of an abstract pattern alias.

See also: c_alias/2.

See also: abstract/1.

Annotations = [term()]

Variable = c_var()

Pattern = cerl()

See also: c_alias/2.

Annotations = [term()]

Operator = cerl()

Arguments = [cerl()]

See also: c_apply/2.

See also: c_atom/1.

See also: c_binary/1.

Annotations = [term()]

Value = Size = Type = Flags = cerl()

Equivalent to ann_c_bitstr(As, Value, Size, abstract(1), Type, Flags).

Annotations = [term()]

Value = Size = Unit = Type = Flags = cerl()

See also: ann_c_bitstr/5, c_bitstr/5.

Annotations = [term()]

Module = Name = cerl()

Arguments = [cerl()]

See also: c_call/3.

Annotations = [term()]

Argument = cerl()

Clauses = [cerl()]

See also: c_case/2.

See also: c_catch/1.

See also: c_char/1.

Annotations = [term()]

Patterns = [cerl()]

Body = cerl()

Equivalent to ann_c_clause(As, Patterns, c_atom(true), Body).

See also: c_clause/3.

Annotations = [term()]

Patterns = [cerl()]

Guard = Body = cerl()

See also: ann_c_clause/3, c_clause/3.

Annotations = [term()]

Head = Tail = cerl()

Result = c_literal() | c_cons()

See also: c_cons/2.

Annotations = [term()]

Head = Tail = cerl()

See also: c_cons_skel/2.

See also: c_float/1.

Annotations = [term()]

Name = atom()

Arity = arity()

Equivalent to ann_c_var(As, {Atom, Arity}).

See also: c_fname/2.

Annotations = [term()]

Variables = [cerl()]

Body = cerl()

See also: c_fun/2.

See also: c_int/1.

Annotations = [term()]

Variables = [cerl()]

Argument = Body = cerl()

See also: c_let/3.

Annotations = [term()]

Definitions = [{cerl(), cerl()}]

Body = cerl()

See also: c_letrec/2.

Annotations = [term()]

Pairs = [c_map_pair()]

Result = c_map() | c_literal()

See also: c_map/1.

Annotations = [term()]

Argument = Result = c_map() | c_literal()

Pairs = [c_map_pair()]

See also: c_map/2

Annotations = [term()]

Operation = Key = Value = cerl()

See also: c_map_pair/2, c_map_pair_exact/2.

See also: c_map_pattern/2

Annotations = [term()]

Name = cerl()

Exports = [cerl()]

Definitions = [{cerl(), cerl()}]

See also: ann_c_module/5, c_module/3.

Annotations = [term()]

Name = cerl()

Exports = [cerl()]

Attributes = Definitions = [{cerl(), cerl()}]

See also: ann_c_module/4, c_module/4.

See also: c_nil/0.

Annotations = [term()]

Name = cerl()

Arguments = [cerl()]

See also: c_primop/2.

Equivalent to ann_c_receive(As, Clauses, c_atom(infinity), c_atom(true)).

See also: c_atom/1, c_receive/3.

Annotations = [term()]

Clauses = [cerl()]

Timeout = Actions = cerl()

See also: ann_c_receive/2, c_receive/3.

Annotations = [term()]

Argument = c_var() | c_record() | c_literal()

Id = term()

Pairs = [c_record_pair()]

Result = #c_record{anno :: list(),
                    arg :: cerl:c_var() | cerl:c_literal(),
                    id :: cerl:c_literal(),
                    es :: [cerl:c_record_pair()]}

See also: c_record/2.

Annotations = [term()]

Key = Value = cerl()

See also: c_record/2.

Annotations = [term()]

Argument = Body = cerl()

See also: c_seq/2.

See also: c_string/1.

Annotations = [term()]

Argument = Body = Handler = cerl()

Variables = ExceptionVars = [cerl()]

See also: c_try/5.

Annotations = [term()]

Elements = [cerl()]

Result = c_tuple() | c_literal()

See also: c_tuple/1.

See also: c_tuple_skel/1.

See also: c_values/1.

See also: c_var/1.

Annotations = [term()]

Type = dtype()

Elementes = [cerl()]

See also: make_data/2.

Annotations = [term()]

Type = dtype()

Elements = [cerl()]

See also: make_data_skel/2.

Annotations = [term()]

List = [cerl()]

Tail = cerl() | none

See also: ann_make_list/2, make_list/2.

Annotations = [term()]

Type = ctype()

Groups = [[cerl()], ...]

Creates a syntax tree with the given annotations, type and subtrees.

See make_tree/2 for details.

See also: make_tree/2.

Returns the list of argument subtrees of an abstract function application.

See also: apply_arity/1, c_apply/2.

Returns the number of argument subtrees of an abstract function application.

Note: this is equivalent to length(apply_args(Node)), but potentially more efficient.

See also: apply_args/1, c_apply/2.

Returns the operator subtree of an abstract function application.

See also: c_apply/2.

Returns the literal string represented by an abstract atom. This always includes surrounding single-quote characters.

Note that an abstract atom may have several literal representations, and that the representation yielded by this function is not fixed; for example, atom_lit(c_atom("a\012b")) could yield the string "\'a\\nb\'".

See also: c_atom/1.

Returns the printname of an abstract atom.

See also: c_atom/1.

Returns the value represented by an abstract atom.

See also: c_atom/1.

Returns the list of segment subtrees of an abstract binary-template.

See also: c_binary/1, c_bitstr/5.

Result = all | any | utf | non_neg_integer()

Returns the total size in bits of an abstract bit-string template.

If the size field is an integer literal, the result is the product of the size and unit values; if the size field is the atom literal all, the atom all is returned. If the size is not a literal, the atom any is returned. If the type of the bit-string segment is one of utf8, utf16 or utf32, the atom utf is returned.

See also: c_bitstr/5.

Returns the flags subtree of an abstract bit-string template.

See also: c_bitstr/5.

Returns the size subtree of an abstract bit-string template.

See also: c_bitstr/5.

Returns the type subtree of an abstract bit-string template.

See also: c_bitstr/5.

Returns the unit subtree of an abstract bit-string template.

See also: c_bitstr/5.

Returns the value subtree of an abstract bit-string template.

See also: c_bitstr/5.

Creates an abstract pattern alias.

The result represents "Variable = Pattern".

See also: alias_pat/1, alias_var/1, ann_c_alias/3, c_clause/3, is_c_alias/1, update_c_alias/3.

Creates an abstract function application.

If Arguments is [A1, ..., An], the result represents "apply Operator(A1, ..., An)".

See also: ann_c_apply/3, apply_args/1, apply_arity/1, apply_op/1, c_call/3, c_primop/2, is_c_apply/1, update_c_apply/3.

Creates an abstract atom literal.

The print name of the atom is the character sequence represented by Name.

Note: passing a string as argument to this function causes a corresponding atom to be created for the internal representation.

See also: ann_c_atom/2, atom_lit/1, atom_name/1, atom_val/1, is_c_atom/1.

Creates an abstract binary-template.

A binary object is in this context is a sequence of an arbitrary number of bits. (The number of bits used to be evenly divisible by 8, but after the introduction of bit strings in the Erlang language, the choice was made to use the binary template for all bit strings.) It is specified by zero or more bit-string template segments of arbitrary lengths (in number of bits).

If Segments is [S1, ..., Sn], the result represents "#{S1, ..., Sn}#". All the Si must have type bitstr.

See also: ann_c_binary/2, binary_segments/1, c_bitstr/5, is_c_binary/1, update_c_binary/2.

Value = Type = Flags = cerl()

Equivalent to c_bitstr(Value, abstract(all), abstract(1), Type, Flags).

Value = Size = Unit = Type = Flags = cerl()

Creates an abstract bit-string template.

These can only occur as components of an abstract binary-template (see c_binary/1). The result represents "#<Value>(Size, Unit, Type, Flags)", where Unit must represent a positive integer constant, Type must represent a constant atom (one of 'integer', 'float', 'binary', 'utf8', 'utf16' or 'utf32'), and Flags must represent a constant list "[F1, ..., Fn]" where all the Fi are atoms.

See also: ann_c_bitstr/6, bitstr_flags/1, bitstr_size/1, bitstr_type/1, bitstr_unit/1, bitstr_val/1, c_binary/1, is_c_bitstr/1, update_c_bitstr/6.

Module = Name = cerl()

Creates an abstract inter-module call.

If Arguments is [A1, ..., An], the result represents "call Module:Name(A1, ..., An)".

See also: ann_c_call/4, c_apply/2, c_primop/2, call_args/1, call_arity/1, call_module/1, call_name/1, is_c_call/1, update_c_call/4.

Creates an abstract case-expression.

If Clauses is [C1, ..., Cn], the result represents "case Argument of C1 ... Cn end". Clauses must not be empty.

See also: ann_c_case/3, c_clause/3, case_arg/1, case_arity/1, case_clauses/1, is_c_case/1, update_c_case/3.

Creates an abstract catch-expression.

The result represents "catch Body".

Note: catch-expressions can be rewritten as try-expressions, and will eventually be removed from Core Erlang.

See also: ann_c_catch/2, c_try/5, catch_body/1, is_c_catch/1, update_c_catch/2.

Creates an abstract character literal.

If the local implementation of Erlang defines char/0 as a subset of integer/0, this function is equivalent to c_int/1. Otherwise, if the given value is an integer, it will be converted to the character with the corresponding code. The lexical representation of a character is "$Char", where Char is a single printing character or an escape sequence.

See also: ann_c_char/2, c_int/1, c_string/1, char_lit/1, char_val/1, is_c_char/1, is_print_char/1.

Equivalent to c_clause(Patterns, c_atom(true), Body).

See also: c_atom/1.

Guard = Body = cerl()

Creates an an abstract clause.

If Patterns is [P1, ..., Pn], the result represents "<P1, ..., Pn> when Guard -> Body".

See also: ann_c_clause/4, c_case/2, c_clause/2, c_receive/3, clause_arity/1, clause_body/1, clause_guard/1, clause_pats/1, clause_vars/1, is_c_clause/1, update_c_clause/4.

Head = Tail = cerl()

Result = c_literal() | c_cons()

Creates an abstract list constructor.

The result represents "[Head | Tail]". Note that if both Head and Tail have type literal, then the result will also have type literal, and annotations on Head and Tail are lost.

Recall that in Erlang, the tail element of a list constructor is not necessarily a list.

See also: ann_c_cons/3, c_cons_skel/2, c_nil/0, cons_hd/1, cons_tl/1, is_c_cons/1, is_c_list/1, list_elements/1, list_length/1, make_list/2, update_c_cons/3.

Head = Tail = cerl()

Creates an abstract list constructor skeleton.

Does not fold constant literals, that is, the result always has type cons, representing "[Head | Tail]".

This function is occasionally useful when it is necessary to have annotations on the subnodes of a list constructor node, even when the subnodes are constant literals. However, note that is_literal/1 will yield false and concrete/1 will fail if passed the result from this function.

fold_literal/1 can be used to revert a node to the normal-form representation.

See also: ann_c_cons_skel/3, c_cons/2, c_nil/0, concrete/1, fold_literal/1, is_c_cons/1, is_c_list/1, is_literal/1, update_c_cons_skel/3.

Creates an abstract floating-point literal.

The lexical representation is the decimal floating-point numeral of Value.

See also: ann_c_float/2, float_lit/1, float_val/1, is_c_float/1.

Equivalent to c_var({Name, Arity}).

See also: ann_c_fname/3, fname_arity/1, fname_id/1, is_c_fname/1, update_c_fname/3.

Creates an abstract fun-expression.

If Variables is [V1, ..., Vn], the result represents "fun (V1, ..., Vn) -> Body". All the Vi must have type var.

See also: ann_c_fun/3, fun_arity/1, fun_body/1, fun_vars/1, is_c_fun/1, update_c_fun/3.

Creates an abstract integer literal.

The lexical representation is the canonical decimal numeral of Value.

See also: ann_c_int/2, c_char/1, int_lit/1, int_val/1, is_c_int/1.

Argument = Body = cerl()

Creates an abstract let-expression.

If Variables is [V1, ..., Vn], the result represents "let <V1, ..., Vn> = Argument in Body". All the Vi must have type var.

See also: ann_c_let/4, is_c_let/1, let_arg/1, let_arity/1, let_body/1, let_vars/1, update_c_let/4.

Creates an abstract letrec-expression.

If Definitions is [{V1, F1}, ..., {Vn, Fn}], the result represents "letrec V1 = F1 ... Vn = Fn in Body". All the Vi must have type var and represent function names. All the Fi must have type 'fun'.

See also: ann_c_letrec/3, is_c_letrec/1, letrec_body/1, letrec_defs/1, letrec_vars/1, update_c_letrec/3.

Creates an abstract map constructor.

If Pairs is [E1, ..., EN], the result represents "~{E1, ..., EN}~" (creating a new map). Note that if all pairs in Pairs have type literal for both the key and the value, or if Pairs is empty, then the result will also have type literal and annotations on nodes in Pairs are lost.

All Ei must be abstract pairs constructed by c_map_pair/2.

See also: ann_c_map/2, is_c_map/1, is_c_map_empty/1, is_c_map_pattern/1, map_es/1, c_map_pair/2, c_map_pair_exact/2.

Creates an abstract map update expression.

If Pairs is [E1, ..., EN], the result represents "~{E1, ..., EN | Argument}~" (updating an existing map). Note that if Argument is a literal and all pairs in Pairs have type literal for both the key and the value, or if Pairs is empty, then the result will also have type literal and annotations on nodes in Pairs are lost.

All Ei must be abstract pairs constructed by either c_map_pair/2 or c_map_pair_exact/2.

See also: ann_c_map/2, is_c_map/1, is_c_map_empty/1, is_c_map_pattern/1, map_es/1, c_map_pair/2, c_map_pair_exact/2.

Key = Value = cerl()

Creates an abstract map pair using the assoc operator.

These can only occur as components of an abstract map creation expression or an abstract update expression (see c_map/1 and c_map/2).

The result represents "Key => Value".

See also: map_pair_key/1, map_pair_op/1, map_pair_val/1.

Key = Value = cerl()

Creates an abstract map pair using the exact operator.

These can only occur as components of an abstract map update expression or an abstract map pattern (see c_map/1 and c_map_pattern/1).

The result represents "Key := Value".

See also: map_pair_key/1, map_pair_op/1, map_pair_val/1.

Creates an abstract map pattern.

If Pairs is [E1, ..., EN], the result represents "~{E1, ..., EN}~".

All Ei must be abstract pairs constructed by c_map_pair_exact/2.

See also: ann_c_map/2, is_c_map/1, is_c_map_empty/1, is_c_map_pattern/1, map_es/1, c_map_pair_exact/2.

Name = cerl()

Exports = [cerl()]

Attributes = Definitions = [{cerl(), cerl()}]

Creates an abstract module definition.

The result represents

    module Name [E1, ..., Ek]
      attributes [K1 = T1, ...,
                  Km = Tm]
      V1 = F1
      ...
      Vn = Fn
    end

if Exports = [E1, ..., Ek], Attributes = [{K1, T1}, ..., {Km, Tm}], and Definitions = [{V1, F1}, ..., {Vn, Fn}].

Name and all the Ki must be atom literals, and all the Ti must be constant literals. All the Vi and Ei must have type var and represent function names. All the Fi must have type 'fun'.

See also: ann_c_module/4, ann_c_module/5, c_atom/1, c_fun/2, c_module/3, c_var/1, is_literal/1, module_attrs/1, module_defs/1, module_exports/1, module_name/1, module_vars/1, update_c_module/5.

Creates an abstract empty list.

The result represents "[]". The empty list is traditionally called "nil".

See also: ann_c_nil/1, c_cons/2, is_c_list/1.

Creates an abstract primitive operation call.

If Arguments is [A1, ..., An], the result represents "primop Name(A1, ..., An)". Name must be an atom literal.

See also: ann_c_primop/3, c_apply/2, c_call/3, is_c_primop/1, primop_args/1, primop_arity/1, primop_name/1, update_c_primop/3.

Equivalent to c_receive(Clauses, c_atom(infinity), c_atom(true)).

See also: c_atom/1.

Clauses = [cerl()]

Timeout = Action = cerl()

Creates an abstract receive-expression.

If Clauses is [C1, ..., Cn], the result represents "receive C1 ... Cn after Timeout -> Action end".

See also: ann_c_receive/4, c_receive/1, is_c_receive/1, receive_action/1, receive_clauses/1, receive_timeout/1, update_c_receive/4.

Argument = record_id()

Pairs = [c_record_pair()]

Result = #c_record{anno :: list(),
                    arg :: cerl:c_var() | cerl:c_literal(),
                    id :: cerl:c_literal(),
                    es :: [cerl:c_record_pair()]}

Creates an abstract record constructor.

See also: ann_c_record/3, is_c_record/1, record_id/1, record_es/1, c_record_pair/2, update_c_record/4.

Creates an abstract record pair.

These can only occur as components of an abstract record creation expression or an abstract update expression (see c_record/2).

The result represents "Key = Value".

See also: ann_c_record_pair/3, record_pair_key/1, record_pair_val/1.

Argument = Body = cerl()

Creates an abstract sequencing expression.

The result represents "do Argument Body".

See also: ann_c_seq/3, is_c_seq/1, seq_arg/1, seq_body/1, update_c_seq/3.

Creates an abstract string literal.

Equivalent to creating an abstract list of the corresponding character literals (cf. is_c_string/1), but is typically more efficient. The lexical representation of a string is ""Chars"", where Chars is a sequence of printing characters or spaces.

See also: ann_c_string/2, c_char/1, is_c_string/1, is_print_string/1, string_lit/1, string_val/1.

Argument = Body = Handler = cerl()

Variables = ExceptionVars = [cerl()]

Creates an abstract try-expression.

If Variables is [V1, ..., Vn] and ExceptionVars is [X1, ..., Xm], the result represents "try Argument of <V1, ..., Vn> -> Body catch <X1, ..., Xm> -> Handler". All the Vi and Xi must have type var.

See also: ann_c_try/6, c_catch/1, is_c_try/1, try_arg/1, try_body/1, try_vars/1, update_c_try/6.

Result = c_tuple() | c_literal()

Creates an abstract tuple.

If Elements is [E1, ..., En], the result represents "{E1, ..., En}". Note that if all nodes in Elements have type literal, or if Elements is empty, then the result will also have type literal and annotations on nodes in Elements are lost.

Recall that Erlang has distinct 1-tuples, that is, {X} is always distinct from X itself.

See also: ann_c_tuple/2, c_tuple_skel/1, is_c_tuple/1, tuple_arity/1, tuple_es/1, update_c_tuple/2.

Creates an abstract tuple skeleton.

Does not fold constant literals, that is, the result always has type tuple, representing "{E1, ..., En}", if Elements is [E1, ..., En].

This function is occasionally useful when it is necessary to have annotations on the subnodes of a tuple node, even when all the subnodes are constant literals. However, note that is_literal/1 will yield false and concrete/1 will fail if passed the result from this function.

fold_literal/1 can be used to revert a node to the normal-form representation.

See also: ann_c_tuple_skel/2, c_tuple/1, concrete/1, fold_literal/1, is_c_tuple/1, is_literal/1, tuple_es/1, update_c_tuple_skel/2.

Creates an abstract value list.

If Elements is [E1, ..., En], the result represents "<E1, ..., En>".

See also: ann_c_values/2, is_c_values/1, update_c_values/2, values_arity/1, values_es/1.

Creates an abstract variable.

A variable is identified by its name, given by the Name parameter.

If a name is given by a single atom, it should either be a "simple" atom which does not need to be single-quoted in Erlang, or otherwise its print name should correspond to a proper Erlang variable, that is, begin with an uppercase character or an underscore. Names of the form {A, N} represent function name variables "A/N"; these are special variables which may be bound only in the function definitions of a module or a letrec. They may not be bound in let expressions and cannot occur in clause patterns. The atom A in a function name may be any atom; the integer N must be nonnegative. The functions c_fname/2 etc. are utilities for handling function name variables.

When printing variable names, they must have the form of proper Core Erlang variables and function names. E.g., a name represented by an integer such as 42 could be formatted as "_42", an atom 'Xxx' simply as "Xxx", and an atom foo as "_foo". However, one must assure that any two valid distinct names are never mapped to the same strings. Tuples such as {foo, 2} representing function names can simply by formatted as "'foo'/2", with no risk of conflicts.

See also: ann_c_var/2, c_fname/2, c_letrec/2, c_module/4, is_c_var/1, update_c_var/2, var_name/1.

Returns the list of argument subtrees of an abstract inter-module call.

See also: c_call/3, call_arity/1.

Returns the number of argument subtrees of an abstract inter-module call.

Note: this is equivalent to length(call_args(Node)), but potentially more efficient.

See also: c_call/3, call_args/1.

Returns the module subtree of an abstract inter-module call.

See also: c_call/3.

Returns the name subtree of an abstract inter-module call.

See also: c_call/3.

Returns the argument subtree of an abstract case-expression.

See also: c_case/2.

Equivalent to clause_arity(hd(case_clauses(Node))), but potentially more efficient.

See also: c_case/2, case_clauses/1, clause_arity/1.

Returns the list of clause subtrees of an abstract case-expression.

See also: c_case/2, case_arity/1.

Returns the body subtree of an abstract catch-expression.

See also: c_catch/1.

Returns the literal string represented by an abstract character. This includes a leading $ character.

Currently, all characters that are not in the set of ISO 8859-1 (Latin-1) "printing" characters will be escaped.

See also: c_char/1.

Returns the value represented by an abstract character literal.

See also: c_char/1.

Returns the number of pattern subtrees of an abstract clause.

Note: this is equivalent to length(clause_pats(Node)), but potentially more efficient.

See also: c_clause/3, clause_pats/1.

Returns the body subtree of an abstract clause.

See also: c_clause/3.

Returns the guard subtree of an abstract clause.

See also: c_clause/3.

Returns the list of pattern subtrees of an abstract clause.

See also: c_clause/3, clause_arity/1.

Returns the list of all abstract variables in the patterns of an abstract clause.

The order of listing is not defined.

See also: c_clause/3, pat_list_vars/1.

Returns the Erlang term represented by a syntax tree.

An exception is thrown if Node does not represent a literal term.

Note: This is a constant time operation.

See also: abstract/1, is_literal/1.

Returns the head subtree of an abstract list constructor.

See also: c_cons/2.

Returns the tail subtree of an abstract list constructor.

Recall that the tail does not necessarily represent a proper list.

See also: c_cons/2.

Source = Target = cerl()

Copies the list of user annotations from Source to Target.

Note: this is equivalent to set_ann(Target, get_ann(Source)), but potentially more efficient.

See also: get_ann/1, set_ann/2.

Returns the number of subtrees of a data constructor node.

This is equivalent to length(data_es(Node)), but potentially more efficient.

See also: data_es/1, is_data/1.

Returns the list of subtrees of a data constructor node.

If the arity of the constructor is zero, the result is the empty list.

Note: if data_type(Node) is cons, the number of subtrees is exactly two. If data_type(Node) is {atomic, Value}, the number of subtrees is zero.

See also: data_arity/1, data_type/1, is_data/1, make_data/2.

Returns a type descriptor for a data constructor node. (Cf. is_data/1.)

This is mainly useful for comparing types and for constructing new nodes of the same type (cf. make_data/2). If Node represents an integer, floating-point number, atom or empty list, the result is {atomic, Value}, where Value is the value of concrete(Node), otherwise the result is either cons or tuple.

Type descriptors can be compared for equality or order (in the Erlang term order), but remember that floating-point values should in general never be tested for equality.

See also: concrete/1, is_data/1, make_data/2, type/1.

Returns the numeral string represented by a floating-point literal node.

See also: c_float/1.

Returns the value represented by a floating-point literal node.

See also: c_float/1.

Returns the arity part of an abstract function name variable.

See also: c_fname/2, fname_id/1.

Returns the identifier part of an abstract function name variable.

See also: c_fname/2, fname_arity/1.

Ensures that literals have a compact representation.

This is occasionally useful if c_cons_skel/2, c_tuple_skel/1 or unfold_literal/1 were used in the construction of Node, and you want to revert to the normal "folded" representation of literals. If Node represents a tuple or list constructor, its elements are rewritten recursively, and the node is reconstructed using c_cons/2 or c_tuple/1, respectively; otherwise, Node is not changed.

See also: c_cons/2, c_cons_skel/2, c_tuple/1, c_tuple_skel/1, is_literal/1, unfold_literal/1.

Translates an explicit record representation to a corresponding abstract syntax tree.

The records are defined in the file "core_parse.hrl".

See also: to_records/1, type/1.

Returns the number of parameter subtrees of an abstract fun-expression.

Note: this is equivalent to length(fun_vars(Node)), but potentially more efficient.

See also: c_fun/2, fun_vars/1.

Returns the body subtree of an abstract fun-expression.

See also: c_fun/2.

Returns the list of parameter subtrees of an abstract fun-expression.

See also: c_fun/2, fun_arity/1.

Returns the list of user annotations associated with a syntax tree node.

For a newly created node, this is the empty list. The annotations may be any terms.

See also: set_ann/2.

Returns the numeral string represented by an integer literal node.

See also: c_int/1.

Returns the value represented by an integer literal node.

See also: c_int/1.

Returns true if Node is an abstract pattern alias, otherwise false.

See also: c_alias/2.

Returns true if Node is an abstract function application, otherwise false.

See also: c_apply/2.

Returns true if Node represents an atom literal, otherwise false.

See also: c_atom/1.

Returns true if Node is an abstract binary-template, otherwise false.

See also: c_binary/1.

Returns true if Node is an abstract bit-string template, otherwise false.

See also: c_bitstr/5.

Returns true if Node is an abstract inter-module call expression, otherwise false.

See also: c_call/3.

Returns true if Node is an abstract case-expression, otherwise false.

See also: c_case/2.

Returns true if Node is an abstract catch-expression, otherwise false.

See also: c_catch/1.

Returns true if Node may represent a character literal, otherwise false.

If the local implementation of Erlang defines char/0 as a subset of integer/0, then is_c_int(Node) will also yield true.

See also: c_char/1, is_print_char/1.

Returns true if Node is an abstract clause, otherwise false.

See also: c_clause/3.

Returns true if Node is an abstract list constructor, otherwise false.

Returns true if Node represents a floating-point literal, otherwise false.

See also: c_float/1.

Returns true if Node is an abstract function name variable, otherwise false.

See also: c_fname/2, c_var/1, var_name/1.

Returns true if Node is an abstract fun-expression, otherwise false.

See also: c_fun/2.

Returns true if Node represents an integer literal, otherwise false.

See also: c_int/1.

Returns true if Node is an abstract let-expression, otherwise false.

See also: c_let/3.

Returns true if Node is an abstract letrec-expression, otherwise false.

See also: c_letrec/2.

Returns true if Node represents a proper list, otherwise false.

A proper list is either the empty list [], or a cons cell [Head | Tail], where recursively Tail is a proper list.

Note: Because Node is a syntax tree, the actual run-time values corresponding to its subtrees may often be partially or completely unknown. Thus, if Node represents for example "[... | Ns]" (where Ns is a variable), then the function will return false, because it is not known whether Ns will be bound to a list at run-time. If Node instead represents for example "[1, 2, 3]" or "[A | []]", then the function will return true.

See also: c_cons/2, c_nil/0, list_elements/1, list_length/1.

Returns true if Node is any kind of abstract map (for constructing, updating or matching), otherwise false.

See also: ann_c_map/3, c_map/1, c_map_pattern/1.

Returns true if Node represents an empty abstract map, otherwise false.

See also: c_map/1, c_map_pattern/1.

Returns true if Node is an abstract map pattern, otherwise false.

See also: c_map/1, c_map_pattern/1.

Returns true if Node is an abstract module definition, otherwise false.

See also: type/1.

Returns true if Node is an abstract empty list, otherwise false.

Returns true if Node is an abstract primitive operation call, otherwise false.

See also: c_primop/2.

Returns true if Node is an abstract receive-expression, otherwise false.

See also: c_receive/3.

Returns true if Node is an abstract record, otherwise false.

See also: c_record/2.

Returns true if Node is an abstract sequencing expression, otherwise false.

See also: c_seq/2.

Returns true if Node may represent a string literal, otherwise false.

Strings are defined as lists of characters; see is_c_char/1 for details.

See also: c_string/1, is_c_char/1, is_print_string/1.

Returns true if Node is an abstract try-expression, otherwise false.

See also: c_try/5.

Returns true if Node is an abstract tuple, otherwise false.

See also: c_tuple/1.

Returns true if Node is an abstract value list, otherwise false.

See also: c_values/1.

Returns true if Node is an abstract variable, otherwise false.

See also: c_var/1.

Returns true if Node represents a data constructor, otherwise false.

Data constructors are cons cells, tuples, and atomic literals.

See also: data_arity/1, data_es/1, data_type/1.

Returns true if Node is a leaf node, otherwise false.

The current leaf node types are literal and var.

Note: all literals (cf. is_literal/1) are leaf nodes, even if they represent structured (constant) values such as {foo, [bar, baz]}. Also note that variables are leaf nodes but not literals.

See also: is_literal/1, type/1.

Returns true if Node represents a literal term, otherwise false.

This function returns true if and only if the value of concrete(Node) is defined.

Note: This is a constant time operation.

See also: abstract/1, concrete/1, fold_literal/1.

Returns true if Term can be represented as a literal, otherwise false.

This function takes time proportional to the size of Term.

See also: abstract/1.

Returns true if Node may represent a "printing" character, otherwise false. (Cf. is_c_char/1.)

A "printing" character has either a given graphical representation, or a "named" escape sequence such as "\n". Currently, only ISO 8859-1 (Latin-1) character values are recognized.

See also: c_char/1, is_c_char/1.

Returns true if Node may represent a string literal containing only "printing" characters, otherwise false.

See is_c_string/1 and is_print_char/1 for details. Currently, only ISO 8859-1 (Latin-1) character values are recognized.

See also: c_string/1, is_c_string/1, is_print_char/1.

Returns the argument subtree of an abstract let-expression.

See also: c_let/3.

Returns the number of left-hand side variables of an abstract let-expression.

Note: this is equivalent to length(let_vars(Node)), but potentially more efficient.

See also: c_let/3, let_vars/1.

Returns the body subtree of an abstract let-expression.

See also: c_let/3.

Returns the list of left-hand side variables of an abstract let-expression.

See also: c_let/3, let_arity/1.

Returns the body subtree of an abstract letrec-expression.

See also: c_letrec/2.

Returns the list of definitions of an abstract letrec-expression.

If Node represents "letrec V1 = F1 ... Vn = Fn in Body", the returned value is [{V1, F1}, ..., {Vn, Fn}].

See also: c_letrec/2.

Returns the list of left-hand side function variable subtrees of a letrec-expression.

If Node represents§ "letrec V1 = F1 ... Vn = Fn in Body", the returned value is [V1, ..., Vn].

See also: c_letrec/2.

Returns the list of element subtrees of an abstract list.

Node must represent a proper list. For example, if Node represents "[X1, X2 | [X3, X4 | []]", then list_elements(Node) yields the list [X1, X2, X3, X4].

See also: c_cons/2, c_nil/0, is_c_list/1, list_length/1, make_list/2.

Returns the number of element subtrees of an abstract list.

Node must represent a proper list. For example, if Node represents "[X1 | [X2, X3 | [X4, X5, X6]]]", then list_length(Node) returns the integer 6.

Note: this is equivalent to length(list_elements(Node)), but potentially more efficient.

See also: c_cons/2, c_nil/0, is_c_list/1, list_elements/1.

Creates a data constructor node with the specified type and subtrees. (Cf. data_type/1.)

An exception is thrown if the length of Elements is invalid for the given Type; see data_es/1 for arity constraints on constructor types.

See also: ann_make_data/3, data_es/1, data_type/1, make_data_skel/2, update_data/3.

Like make_data/2, but analogous to c_tuple_skel/1 and c_cons_skel/2.

See also: ann_make_data_skel/3, c_cons_skel/2, c_tuple_skel/1, make_data/2, update_data_skel/3.

Creates an abstract list from the elements in List and the optional Tail.

If Tail is none, the result will represent a nil-terminated list, otherwise it represents "[... | Tail]".

See also: ann_make_list/3, c_cons/2, c_nil/0, list_elements/1, update_list/3.

Creates a syntax tree with the given type and subtrees.

Type must be a node type name (cf. type/1) that does not denote a leaf node type (cf. is_leaf/1).

Groups must be a nonempty list of groups of syntax trees, representing the subtrees of a node of the given type, in left-to-right order as they would occur in the printed program text, grouped by category as done by subtrees/1.

The result of ann_make_tree(get_ann(Node), type(Node), subtrees(Node)) (cf. update_tree/2) represents the same source code text as the original Node, assuming that subtrees(Node) yields a nonempty list. However, it does not necessarily have the exact same data representation as Node.

See also: ann_make_tree/3, is_leaf/1, subtrees/1, type/1, update_tree/2.

Node = Result = c_map() | c_literal()

Returns the argument subtree of an abstract map.

See also: c_map/2.

Returns the list of map pair subtrees of an abstract map.

See also: c_map/1.

Returns the key subtree of an abstract map pair.

See also: c_map_pair/2, c_map_pair_exact/2.

Returns the operation subtree of an abstract map pair.

See also: c_map_pair/2, c_map_pair_exact/2.

Returns the value subtree of an abstract map pair.

See also: c_map_pair/2, c_map_pair_exact/2.

Creates a meta-representation of a syntax tree.

The result represents an Erlang expression "MetaTree" which, if evaluated, will yield a new syntax tree representing the same source code text as Tree (although the actual data representation may be different). The expression represented by MetaTree is implementation independent with regard to the data structures used by the abstract syntax tree implementation.

Any node in Tree whose node type is var (cf. type/1), and whose list of annotations (cf. get_ann/1) contains the atom meta_var, will remain unchanged in the resulting tree, except that exactly one occurrence of meta_var is removed from its annotation list.

The main use of the function meta/1 is to transform a data structure Tree, which represents a piece of program code, into a form that is representation independent when printed. E.g., suppose Tree represents a variable named "V". Then (assuming a function print/1 for printing syntax trees), evaluating print(abstract(Tree)) - simply using abstract/1 to map the actual data structure onto a syntax tree representation - would output a string that might look something like "{var, ..., 'V'}", which is obviously dependent on the implementation of the abstract syntax trees. This could, for example, be useful for caching a syntax tree in a file. However, in some situations like in a program generator generator (with two "generator"), it may be unacceptable. Using print(meta(Tree)) instead would output a representation independent syntax tree generating expression; in the above case, something like "cerl:c_var('V')".

The implementation tries to generate compact code with respect to literals and lists.

See also: abstract/1, get_ann/1, type/1.

Returns the list of pairs of attribute key/value subtrees of an abstract module definition.

See also: c_module/4.

Returns the list of function definitions of an abstract module definition.

See also: c_module/4.

Returns the list of exports subtrees of an abstract module definition.

See also: c_module/4.

Returns the name subtree of an abstract module definition.

See also: c_module/4.

Returns the list of left-hand side function variable subtrees of an abstract module definition.

See also: c_module/4.

Returns the list of all abstract variables in the given patterns.

An exception is thrown if some element in Patterns does not represent a well-formed Core Erlang clause pattern. The order of listing is not defined.

See also: clause_vars/1, pat_vars/1.

Returns the list of all abstract variables in a pattern.

An exception is thrown if Node does not represent a well-formed Core Erlang clause pattern. The order of listing is not defined.

See also: clause_vars/1, pat_list_vars/1.

Returns the list of argument subtrees of an abstract primitive operation call.

See also: c_primop/2, primop_arity/1.

Returns the number of argument subtrees of an abstract primitive operation call.

Note: this is equivalent to length(primop_args(Node)), but potentially more efficient.

See also: c_primop/2, primop_args/1.

Returns the name subtree of an abstract primitive operation call.

See also: c_primop/2.

Returns the action subtree of an abstract receive-expression.

See also: c_receive/3.

Returns the list of clause subtrees of an abstract receive-expression.

See also: c_receive/3.

Returns the timeout subtree of an abstract receive-expression.

See also: c_receive/3.

Result = c_var() | c_literal()

Returns the argument subtree of an abstract record.

See also: c_record/2.

Returns the list of native record pair subtrees of an abstract record.

See also: c_record/2.

Returns the identifier of of an abstract record.

See also: c_record/2.

Returns the key subtree of an abstract record pair.

See also: c_record_pair/2.