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An abstract syntax tree (AST) is a data structure used in computer science to represent the structure of a program or code snippet. It is a tree representation of the abstract syntactic structure of text (often source code ) written in a formal language .
A parse tree or parsing tree [1] (also known as a derivation tree or concrete syntax tree) is an ordered, rooted tree that represents the syntactic structure of a string according to some context-free grammar. The term parse tree itself is used primarily in computational linguistics; in theoretical syntax, the term syntax tree is more common.
The standard definition of c-command is based partly on the relationship of dominance: Node N 1 dominates node N 2 if N 1 is above N 2 in the tree and one can trace a path from N 1 to N 2 moving only downwards in the tree (never upwards); that is, if N 1 is a parent, grandparent, etc. of N 2. For a node (N1) to c-command another node (N2) the ...
This is particularly used in the representation of text in computer languages, [2] which are generally stored in a tree structure as an abstract syntax tree. Abstract syntax, which only consists of the structure of data, is contrasted with concrete syntax, which also includes information about the representation. For example, concrete syntax ...
Parse tree of Python code with inset tokenization. The syntax of textual programming languages is usually defined using a combination of regular expressions (for lexical structure) and Backus–Naur form (a metalanguage for grammatical structure) to inductively specify syntactic categories (nonterminal) and terminal symbols. [7]
This hierarchy can also be seen as a tree: This tree is called a parse tree or "concrete syntax tree" of the string, by contrast with the abstract syntax tree . In this case the presented leftmost and the rightmost derivations define the same parse tree; however, there is another rightmost derivation of the same string
Syntax tree may refer to: Abstract syntax tree, used in computer science; Concrete syntax tree, used in linguistics This page was last edited on 7 ...
However, there are several other ways of representing sentences in GPSG. Certain constituents can be illustrated without drawing a full tree by placing the constituent in question inside of brackets like so: This file provides a simple example of a syntax tree that fits the Generalized Phrase Structure Grammar Framework.