pub enum Ast {
Empty(Span),
Flags(SetFlags),
Literal(Literal),
Dot(Span),
Assertion(Assertion),
Class(Class),
Repetition(Repetition),
Group(Group),
Alternation(Alternation),
Concat(Concat),
}
An abstract syntax tree for a single regular expression.
An Ast
's fmt::Display
implementation uses constant stack space and heap
space proportional to the size of the Ast
.
This type defines its own destructor that uses constant stack space and
heap space proportional to the size of the Ast
.
An empty regex that matches everything.
A set of flags, e.g., (?is)
.
A single character literal, which includes escape sequences.
The "any character" class.
A single zero-width assertion.
A single character class. This includes all forms of character classes
except for .
. e.g., \d
, \pN
, [a-z]
and [[:alpha:]]
.
A repetition operator applied to an arbitrary regular expression.
A grouped regular expression.
An alternation of regular expressions.
A concatenation of regular expressions.
Return the span of this abstract syntax tree.
Return true if and only if this Ast is empty.
A custom Drop
impl is used for Ast
such that it uses constant stack
space but heap space proportional to the depth of the Ast
.
Executes the destructor for this type. Read more
This method tests for self
and other
values to be equal, and is used by ==
. Read more
This method tests for !=
.
Performs copy-assignment from source
. Read more
Formats the value using the given formatter. Read more
Print a display representation of this Ast.
This does not preserve any of the original whitespace formatting that may
have originally been present in the concrete syntax from which this Ast
was generated.
This implementation uses constant stack space and heap space proportional
to the size of the Ast
.
Formats the value using the given formatter. Read more
Creates owned data from borrowed data, usually by cloning. Read more
🔬 This is a nightly-only experimental API. (toowned_clone_into
)
recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
Converts the given value to a String
. Read more
🔬 This is a nightly-only experimental API. (try_from
)
The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (try_from
)
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more
🔬 This is a nightly-only experimental API. (try_from
)
The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (try_from
)
🔬 This is a nightly-only experimental API. (get_type_id
)
this method will likely be replaced by an associated static