Formal Languages and Translators: Difference between revisions
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==Grammar== | ==Grammar== | ||
<span id='Derivation'></span>'''Derivation''' | <span id='Derivation'></span>'''Derivation'''. <span id='Leftmost_Derivation'></span>'''The leftmost derivation'''. <span id='Rightmost_Derivation'></span>'''The rightmost derivation'''. | ||
<span id='Production'></span>'''Production''' | <span id='Production'></span>'''Production''' | ||
Revision as of 21:16, 13 July 2018
Internal
Overview
Compiler
Interpreter
Lexical Analysis
Regular Expressions
Finite Automata
Syntax Analysis (Parsing)
TODO Deplete This Parsing
Grammar
Derivation. The leftmost derivation. The rightmost derivation.
Production
Production head
Production body
Terminal
Nonterminal
Backus-Naur Form (BNF)
Extended Backus-Naur Form (EBNF)
Parse Tree
A parse tree is a graphical representation of a derivation. Each interior node of a parse tree represents the application of a production and it is labeled with the name of the nonterminal that is the head of the production. The children node are labeled, from left to right, by the symbols in the body of the production. While is being constructed, the leaves of a parse tree may represent terminals and nonterminals, and at any moment, if they are read from left to right, they constitute the yield or the frontier of the tree, and it is also referred to as a sentential from of the grammar. A parse tree does not contain the information that reflects the order in which productions are applied to replace nonterminals. It is customary to produce parse trees by always producing the leftmost (or rightmost) derivation. Each parse tree has associated with it a unique leftmost and an unique rightmost derivation.