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Top-down parser utilizing recursion
computer science, a recursive descent parser is a kind of top-down parser built from a set of mutually recursive procedures (or a non-recursive equivalent) where
Recursive_descent_parser
Type of grammar for describing formal languages
in practice, e.g. by a recursive descent parser. Unlike CFGs, PEGs cannot be ambiguous; a string has exactly one valid parse tree or none. It is conjectured
Parsing_expression_grammar
Bottom-up parser that interprets an operator-precedence grammar
operator-precedence parser is a bottom-up parser that interprets an operator-precedence grammar. For example, most calculators use operator-precedence parsers to convert
Operator-precedence_parser
Higher-order function that combines several parsers
parser combinator is a higher-order function that accepts several parsers as input and returns a new parser as its output. In this context, a parser is
Parser_combinator
recursive ascent parsing is a technique for implementing an LR parser which uses mutually-recursive functions rather than tables. Thus, the parser is
Recursive_ascent_parser
Type of a context-free grammar
is about the formal properties of LL grammars; for parsing, see LL parser or recursive descent parser. Given a natural number k ≥ 0 {\displaystyle k\geq
LL_grammar
Type of parser
The Packrat parser is a type of parser that shares similarities with the recursive descent parser in its construction. However, it differs because it
Packrat_parser
Parsing technique
shift-reduce parser, and does bottom-up parsing. A formal grammar that contains left recursion cannot be parsed by a naive recursive descent parser unless they
Top-down_parsing
Top-down parser that parses input from left to right
In computer science, an LL parser is a top-down parser for a restricted context-free language. It parses the input from Left to right, performing Leftmost
LL_parser
Type of parser in computer science
<identifier> A simple tail recursive parser can be written much like a recursive descent parser. The typical algorithm for parsing a grammar like this using
Tail_recursive_parser
John; Spiewak, Daniel (2010-09-17). "Tool Paper: ScalaBison Recursive Ascent-Descent Parser Generator". Electronic Notes in Theoretical Computer Science
Comparison of parser generators
Comparison_of_parser_generators
Analysing a string of symbols, according to the rules of a formal grammar
supporting some context-free grammars and parsing expression grammars Pratt parser Recursive descent parser: a top-down parser suitable for LL(k) grammars Shunting-yard
Parsing
Software programming optimization technique
backtracking recursive descent parser to solve the problem of exponential time complexity. The basic idea in Norvig's approach is that when a parser is applied
Memoization
Algorithm for parsing context-free languages
In computer science, the Earley parser is an algorithm for parsing strings that belong to a given context-free language. Named after its inventor Jay Earley
Earley_parser
Parser generator written in C++
The Spirit Parser Framework is an object oriented recursive descent parser generator framework implemented using template metaprogramming techniques.
Spirit_Parser_Framework
Parsing algorithm for context-free languages
recursive descent parser to be turned into a GLL parser, a few smaller transformations have to be made first. Similarly to GLR, the resulting parse forest
GLL_parser
Two functions defined from each other
and in some problem domains, such as recursive descent parsers, where the datatypes are naturally mutually recursive. The most important basic example of
Mutual_recursion
code. A recursive ascent parser implements an LALR parser using mutually-recursive functions rather than tables. Thus, the parser is directly encoded in
History of compiler construction
History_of_compiler_construction
command it could handle. By contrast, Hamilton uses a top-down recursive descent parser that allows it to compile statements to an internal form before
Hamilton_C_shell
Type of parser in computer science
parser loop in table-driven parsers. The fastest parsers use generated assembler code. In the recursive ascent parser variation, the explicit parse stack
LR_parser
Theory of computer sciences
{Expression}}+{\mathit {Term}}} is directly left-recursive. A left-to-right recursive descent parser for this rule might look like void Expression() {
Left_recursion
Markup language and file format
Pull parsing treats the document as a series of items read in sequence using the iterator design pattern. This allows for writing of recursive descent parsers
XML
Programming language
"(" expression ")"; It is rather easy for students to write a recursive descent parser for such a simple syntax. Therefore, the PL/0 compiler is still
PL/0
formal representation of a recursive descent parser, in which each of the nonterminals schematically represents a parsing function. Each of these nonterminal-functions
Top-down_parsing_language
Free and open-source compiler for various programming languages
GCC started out using LALR parsers generated with Bison, but gradually switched to hand-written recursive-descent parsers for C++ in 2004, and for C and
GNU_Compiler_Collection
Sequence of characters that forms a search pattern
of Perl 5.x regexes, but also allow BNF-style definition of a recursive descent parser via sub-rules. The use of regexes in structured information standards
Regular_expression
Yacc-compatible parser generator program
grammars. GCC started out using Bison, but switched to a hand-written recursive-descent parser for C++ in 2004 (version 3.4), and for C and Objective-C in 2006
GNU_Bison
supporting some context-free grammars and parsing expression grammars Pratt parser Recursive descent parser: a top-down parser suitable for LL(k) grammars Shunting-yard
List_of_algorithms
Open-source Java library
implements a complete recursive descent parser with support for abstract syntax tree construction, parse error reporting and parse error recovery. Free
Parboiled_(Java)
Programming language
(S/SL) is an executable high level specification language for recursive descent parsers, semantic analyzers and code generators developed by James Cordy
S/SL_programming_language
Topics referred to by the same term
detection program, for analysing genetic recombination Recursive descent parser, a type of top-down parser Remote Desktop Protocol, a Microsoft remote access
RDP
Class of bottom-up parsing methods
shift-reduce parser scans and parses the input text in one forward pass over the text, without backing up. The parser builds up the parse tree incrementally
Shift-reduce_parser
Computer programming language
defined by a context-free grammar amenable to being processed by recursive descent parser as described in seminal books on compiler design. A set of Charm
Charm_(programming_language)
Algorithm to parse a syntax with infix notation to postfix notation
π ) Operator-precedence parser Stack-sortable permutation Theodore Norvell (1999). "Parsing Expressions by Recursive Descent". www.engr.mun.ca. Retrieved
Shunting_yard_algorithm
American computer scientist
Little C interpreter, which is a lengthy example of a hand-written recursive-descent parser which interprets a subset of the C language. The program was originally
Herbert_Schildt
Type of neural network which utilizes recursion
A recursive neural network is a kind of deep neural network created by applying the same set of weights recursively over a structured input, to produce
Recursive_neural_network
Problem in computer programming
ambiguity: If the parser is produced by an SLR, LR(1), or LALR LR parser generator, the programmer will often rely on the generated parser feature of preferring
Dangling_else
BASIC programming languages designed for under 4 KB
"The TINY BASIC interpreter was designed by Dennis Allison as a recursive descent parser. Some of the elegant simplicity of this design was lost in the
Tiny_BASIC
Software to run programming languages
the Parser Grammar Engine (PGE), a hybrid parser-generator that can express a recursive descent parser as well as an operator-precedence parser, allowing
Parrot_virtual_machine
JavaScript | MDN". 8 July 2025. "LibJS: Add Rust implementation of lexer, parser, AST, and bytecode generator". GitHub. "LibWASM: Add hand-written assembly
List_of_JavaScript_engines
Optimization algorithm
Stochastic gradient descent (often abbreviated SGD) is an iterative method for optimizing an objective function with suitable smoothness properties (e
Stochastic_gradient_descent
Recovery-oriented computing – Recursive descent parser – Recursion (computer science) – Recursive set – Recursively enumerable language – Recursively enumerable set
Index_of_computing_articles
Dialect of the PL/I programming language
easier to write than an entirely hand-written recursive descent parser. XCOM uses a bottom-up parsing method, in which the compiler can delay its decision
XPL
Interpreter that enables users to enter and run programs in the BASIC language
operators. To support such expressions requires implementing a recursive descent parser. This parser can be implemented in a number of ways: As a virtual machine
BASIC_interpreter
C compiler for Unix and Unix-like operating systems
whom?] The first C compiler, written by Dennis Ritchie, used a recursive descent parser, incorporated specific knowledge about the PDP-11, and relied on
Portable_C_Compiler
Programming language
describes this as being an aid to efficiency, but unlike a naive recursive descent parser compiler it will also ensure that the associativity of arithmetic
META_II
Compiler-compiler
In computing, TMG (Transmogrifier) is a recursive descent compiler-compiler developed by Robert M. McClure and presented in 1965. TMG ran on systems including
TMG_(language)
Logic formula
and y itself is a formula. This idea can be used to generate a recursive descent parser for formulas. Example of parenthesis counting: This method locates
Propositional_formula
Compiler generator
stream (e.g. compiler directives or end-of-line characters). The parser uses recursive descent; LL(1) conflicts can be resolved by either a multi-symbol lookahead
Coco/R
Software that translates code from one programming language to another
the parser. Languages which strop their keywords or allow arbitrary spaces within identifiers require this phase. The top-down, recursive-descent, table-driven
Compiler
1960s computer programming language
AA compiler included run-time support for a top-down recursive descent parser. The style of parser used in the Compiler Compiler was in use continuously
Atlas_Autocode
JetPAG (Jet Parser Auto-Generator) is an open-source LL(k) parser and lexical analyzer generator, licensed under the GNU General Public License. It is
JetPAG
Class of artificial neural network
Cliff; Ng, Andrew Y.; Manning, Christopher D., "Parsing Natural Scenes and Natural Language with Recursive Neural Networks" (PDF), 28th International Conference
Recurrent_neural_network
Overview of and topical guide to algorithms
tree Suffix array Burrows–Wheeler transform Regular expression Parsing Earley parser CYK algorithm Euclidean algorithm Extended Euclidean algorithm Sieve
Outline_of_algorithms
Automatic generation or recognition of paraphrased text
the use of recursive autoencoders. The main concept is to produce a vector representation of a sentence and its components by recursively using an autoencoder
Paraphrasing (computational linguistics)
Paraphrasing_(computational_linguistics)
Type of formal grammar
are generalizations of the main context-free parsing algorithms, including the linear-time recursive descent, the cubic-time generalized LR, the cubic-time
Conjunctive_grammar
Programming language
as a map[string]interface{} (map of string to empty interface). This recursively describes data in the form of a dictionary with string keys and values
Go_(programming_language)
Programming language derived from Perl
Author. Lenz, Moritz (4 December 2017). Parsing with Perl 6 Regexes and Grammars: A Recursive Descent into Parsing. Apress. ISBN 978-1-4842-3228-6. Foy,
Raku_(programming_language)
Branch of machine learning
of as probabilistic context free grammar (PCFG) implemented by an RNN. Recursive auto-encoders built atop word embeddings can assess sentence similarity
Deep_learning
System of elements that are subordinated to each other
Recursion itself is included as a subset of hierarchical programming, and recursive thinking can be synonymous with a form of hierarchical thinking and logic
Hierarchy
Chinese-American computer scientist
Tai, Y., Yang, J., & Liu, X. (2017). Image super-resolution via deep recursive residual network. In Proceedings of the IEEE conference on computer vision
Xiaoming_Liu
American computer scientist and mathematician (born 1938)
the ALGOL syntax chart, symbol table, recursive-descent approach, and the separation of the scanning, parsing, and emitting functions of the compiler
Donald_Knuth
Symbolic cognitive architecture
a substate. In the substate, the same process of problem solving is recursively used, but with the goal to retrieve or discover knowledge so that decision
Soar_(cognitive_architecture)
Project in integrated circuit design
having to rewrite the database entirely. OpenDB has an in-built LEF/DEF parser, and designs are often entered into OpenDB from LEF/DEF format. OpenDB also
OpenROAD_Project
Multi-paradigm system programming language
functional programming features such as function literals, closures, recursively-immutable objects and the use of higher-order functions. There are two
D_(programming_language)
Recurrence plot Recurrence quantification analysis Recursive Bayesian estimation Recursive least squares Recursive partitioning Reduced form Reference class problem
List_of_statistics_articles
Classification of Artificial Neural Networks (ANNs)
2019-08-25. Socher, Richard; Lin, Clif (2011). "Parsing Natural Scenes and Natural Language with Recursive Neural Networks" (PDF). Proceedings of the 26th
Types of artificial neural networks
Types_of_artificial_neural_networks
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