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Qu'est-ce (qui) est abstract syntax - définition
Abstract syntax
SYNTACTIC STRUCTURE INDEPENDENT OF ANY PARTICULAR REPRESENTATION OR ENCODING
Abstract Syntax; First-order abstract syntax
In computer science, the abstract syntax of data is its structure described as a data type (possibly, but not necessarily, an abstract data type), independent of any particular representation or encoding. This is particularly used in the representation of text in computer languages, which are generally stored in a tree structure as an abstract syntax tree.
abstract syntax
SYNTACTIC STRUCTURE INDEPENDENT OF ANY PARTICULAR REPRESENTATION OR ENCODING
Abstract Syntax; First-order abstract syntax
<language, data> A representation of data (typically either a
message passing over a communications link or a program being
compiled) which is independent of machine-oriented structures
and encodings and also of the physical representation of the
data (called "concrete syntax" in the case of compilation or
"transfer syntax" in communications).
A compiler's internal representation of a program will
typically be specified by an abstract syntax in terms of
categories such as "statement", "expression" and "identifier".
This is independent of the source syntax (concrete syntax)
of the language being compiled (though it will often be very
similar). A parse tree is similar to an abstract syntax
tree but it will typically also contain features such as
parentheses which are syntactically significant but which are
implicit in the structure of the abstract syntax tree.
(1998-05-26)
abstract syntax tree
![An abstract syntax tree for the following code for the [[Euclidean algorithm]]:<syntaxhighlight lang="python">
while b ≠ 0:
if a > b:
a := a - b
else:
b := b - a
return a
</syntaxhighlight>](https://commons.wikimedia.org/wiki/Special:FilePath/Abstract syntax tree for Euclidean algorithm.svg?width=200 "An abstract syntax tree for the following code for the [[Euclidean algorithm]]:<syntaxhighlight lang=\"python\">
while b ≠ 0:
if a > b:
a := a - b
else:
b := b - a
return a
</syntaxhighlight>")
TREE REPRESENTATION OF THE ABSTRACT SYNTACTIC STRUCTURE OF SOURCE CODE
Abstract syntax trees; Abstract Syntax Tree; Abstract syntax tree representation
<compiler> (AST) A data structure representing something which
has been parsed, often used as a compiler or interpreter's
internal representation of a program while it is being
optimised and from which code generation is performed. The
range of all possible such structures is described by the
abstract syntax.
(1994-11-08)
