attribute grammars - ορισμός. Τι είναι το attribute grammars
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Τι (ποιος) είναι attribute grammars - ορισμός

FORMAL WAY TO DEFINE ATTRIBUTES FOR THE PRODUCTIONS OF A FORMAL GRAMMAR, ASSOCIATING THESE ATTRIBUTES WITH VALUES
Attribute grammars

Attribute grammar         
An attribute grammar is a formal way to supplement a formal grammar with semantic information processing. Semantic information is stored in attributes associated with terminal and nonterminal symbols of the grammar.
Entity–attribute–value model         
TYPE OF SPACE-EFFICIENT DATA MODEL
Entity-Attribute-Value model; Object-attribute-value model; Open schema; EAV model; Entity-attribute-value model
Entity–attribute–value model (EAV) is a data model to encode, in a space-efficient manner, entities where the number of attributes (properties, parameters) that can be used to describe them is potentially vast, but the number that will actually apply to a given entity is relatively modest. Such entities correspond to the mathematical notion of a sparse matrix.
Attribute (computing)         
  • methods]]
  • column]] or field
COMPUTER TERM WHICH DESCRIBES A VARIABLE LINKED TO A PARTICULAR INSTANCE OR CLASS; CHARACTERISTICS THAT ARE ATTRIBUTED TO AN OBJECT
Attribute (computer science); Name attribute
In computing, an attribute is a specification that defines a property of an object, element, or file. It may also refer to or set the specific value for a given instance of such.

Βικιπαίδεια

Attribute grammar

An attribute grammar is a formal way to supplement a formal grammar with semantic information processing. Semantic information is stored in attributes associated with terminal and nonterminal symbols of the grammar. The values of attributes are result of attribute evaluation rules associated with productions of the grammar. Attributes allow to transfer information from anywhere in the abstract syntax tree to anywhere else, in a controlled and formal way.

Each semantic function deals with attributes of symbols occurring only in one production rule: both semantic function parameters and its result are attributes of symbols from one particular rule. When a semantic function defines the value of an attribute of the symbol on the left hand side of the rule, the attribute is called synthesized; otherwise it is called inherited. Thus, synthesized attributes serve to pass semantic information up the parse tree, while inherited attributes allow values to be passed from the parent nodes down and across the syntax tree.

In simple applications, such as evaluation of arithmetic expressions, attribute grammar may be used to describe the entire task to be performed besides parsing in straightforward way; in complicated systems, for instance, when constructing a language translation tool, such as a compiler, it may be used to validate semantic checks associated with a grammar, representing the rules of a language not explicitly imparted by the syntax definition. It may be also used by parsers or compilers to translate the syntax tree directly into code for some specific machine, or into some intermediate language.