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Analysing a string of symbols, according to the rules of a formal grammar
SYNTAX XPL Yacc Lookahead establishes the maximum incoming tokens that a parser can use to decide which rule it should use. Lookahead is especially relevant
Parsing
Arithmetic logic circuit
A carry-lookahead adder (CLA) or fast adder is a type of electronics adder used in digital logic. A carry-lookahead adder improves speed by reducing the
Carry-lookahead_adder
Topics referred to by the same term
Look up lookahead or look ahead in Wiktionary, the free dictionary. Lookahead or Look Ahead may refer to: A parameter of some combinatorial search algorithms
Lookahead
Algorithm used to analyze and process programming languages
a canonical LR parser is an LR(k) parser for k=1, i.e. with a single lookahead terminal. The special attribute of this parser is that any LR(k) grammar
Canonical_LR_parser
Type of parser in computer science
one-token lookahead, to resolve differences between rule patterns during parsing. Similarly, there is an LALR(2) parser with two-token lookahead, and LALR(k)
LALR_parser
Bottom-up parser that interprets an operator-precedence grammar
min_precedence) lookahead := peek next token while lookahead is a binary operator whose precedence is >= min_precedence op := lookahead advance to next
Operator-precedence_parser
Software library for interpreting regular expressions
Assertion Lookbehind Lookahead Positive (?<=pattern) (?=pattern) Negative (?<!pattern) (?!pattern) Look-behind and look-ahead assertions in Perl regular
Perl Compatible Regular Expressions
Perl_Compatible_Regular_Expressions
Arithmetic logic circuit
the Kogge–Stone adder (KSA or KS) is a parallel prefix form of carry-lookahead adder. Other parallel prefix adders (PPA) include the Sklansky adder (SA)
Kogge–Stone_adder
Digital circuit that produces sums from inputs
Smith invented a faster way to add two binary numbers by using carry-lookahead adders (CLA). They introduced two signals ( P {\displaystyle P} and G
Adder_(electronics)
Sequence of characters that forms a search pattern
piece of text. Thus, it lacks advanced features such as capture groups, lookahead, and backreferences. Many features found in virtually all modern regular
Regular_expression
Type of parser in computer science
backtracking or guessing, the LR parser is allowed to peek ahead at k lookahead input symbols before deciding how to parse earlier symbols. Typically
LR_parser
include: A* search algorithm Alpha–beta pruning Branch-and-bound Minimax Lookahead is an important component of combinatorial search, which specifies, roughly
Combinatorial_search
Parser generator
for the Unix operating system developed by Stephen C. Johnson. It is a lookahead left-to-right rightmost derivation (LALR) parser generator, generating
Yacc
Computer mechanic
section on reductions' lookahead sets.) The one difference between SLR and LALR is how their generators calculate the lookahead sets of input symbols that
Simple_LR_parser
Logical unit in digital circuit design
A lookahead carry unit (LCU) is a logical unit in digital circuit design used to decrease calculation time in adder units and used in conjunction with
Lookahead_carry_unit
A lookahead LR parser (LALR) generator is a software tool that reads a context-free grammar (CFG) and creates an LALR parser which is capable of parsing
LALR_parser_generator
English media personality and sex offender (1926–2011)
the original on 11 November 2022. Mzimba, Lizo (26 December 2021). "TV lookahead: 22 highlights to look out for in 2022". BBC News. Archived from the original
Jimmy_Savile
Top-down parser that parses input from left to right
sentence. An LL parser is called an LL(k) parser if it uses k tokens of lookahead when parsing a sentence. A grammar is called an LL(k) grammar if an LL(k)
LL_parser
Arithmetic logic circuit
The Brent–Kung adder is a parallel prefix adder (PPA) form of carry-lookahead adder (CLA). Proposed by Richard Peirce Brent and Hsiang Te Kung in 1982
Brent–Kung_adder
Formalism to describe programming languages
context-free grammars in Clojure, extended with PEG-like syntax for lookahead and negative lookahead GNU bison, GNU version of yacc Yacc, parser generator (most
Backus–Naur_form
Type of a context-free grammar
choose a rule to derive the nonterminal "Stmt". Looking only at the first lookahead token "v", it cannot decide which of both alternatives for "Stmt" to choose
LL_grammar
Class of bottom-up parsing methods
current lookahead symbol, and remaining unscanned text. The parser's next action is determined by the rightmost stack symbol(s) and the lookahead symbol
Shift-reduce_parser
Arithmetic logic circuit
Components Adder (+) Adder Half adder Full adder Ripple-carry adder Carry-lookahead adder Brent–Kung adder Kogge–Stone adder Ling adder Carry-save adder Carry-select
Carry-skip_adder
Topics referred to by the same term
containing Ahead Dead Ahead (disambiguation) Go Ahead (disambiguation) Lookahead (disambiguation) Looking Ahead (disambiguation) Straight Ahead (disambiguation)
Ahead
Discontinued online library
(BiCGSTAB) Generalized Minimum Residual (GMRES) Quasi-Minimal Residual Without Lookahead (QMR) IML++ was developed by the National Institute of Standards and Technology
IML++
Computing circuit
converted into much more than just an adder—an ALU. Adder (electronics) Carry-lookahead adder Carry-save adder Adding machine Subtractor Teja, Ravi (2021-04-21)
Adder–subtractor
Electronic circuit used to multiply binary numbers
Components Adder (+) Adder Half adder Full adder Ripple-carry adder Carry-lookahead adder Brent–Kung adder Kogge–Stone adder Ling adder Carry-save adder Carry-select
Binary_multiplier
Algorithm for encoding data bytes
algorithms like HDLC. COBS does, however, require up to 254 bytes of lookahead. Before transmitting its first byte, it needs to know the position of
Consistent Overhead Byte Stuffing
Consistent_Overhead_Byte_Stuffing
Device performing a Boolean function
A logic circuit diagram for a 4-bit carry lookahead binary adder design using only the AND, OR, and XOR logic gates
Logic_gate
Standard for distributed simulation
time plus the federates lookahead. Advancing: When a federate has finished producing data for the granted time plus the lookahead, it may request to be
High_Level_Architecture
Digital circuit implementation method
s_{n-1}} . The carry-select adder design can be complemented with a carry-lookahead adder structure to generate the MUX inputs, thus gaining even greater
Carry-select_adder
American tennis player (born 1998)
from the original on May 6, 2015. Retrieved May 2, 2015. "French Open Lookahead: American Teen Tiafoe Makes Slam Debut". Tennis.com. Archived from the
Frances_Tiafoe
Indian tennis player (born 1986)
mixed doubles". ausopen.com. Retrieved 25 January 2023. "Australian Open lookahead: Djokovic faces Paul in semifinals- Sania Mirza confirms retirement, to
Sania_Mirza
tighter lookahead sets for the same parser states. Those smaller sets can eliminate overlap with the state's shift actions, and overlap with lookaheads for
SLR_grammar
AI research laboratory
policy network against itself. After training, these networks employed a lookahead Monte Carlo tree search, using the policy network to identify candidate
Google_DeepMind
optional handling of repeated submatch). The implementation is based on the lookahead-TDFA algorithm. Encoding support: re2c supports ASCII, UTF-8, UTF-16,
Re2c
Efficient hardware implementation of a digital multiplier
Components Adder (+) Adder Half adder Full adder Ripple-carry adder Carry-lookahead adder Brent–Kung adder Kogge–Stone adder Ling adder Carry-save adder Carry-select
Wallace_tree
Chess variant played on a 6×6 board without bishops
look four plies ahead. For scoring the board at the end of the four-ply lookahead, it estimates a score for material and a score for mobility, then adds
Los_Alamos_chess
Arithmetic operation
digits in parallel; these schemes go by such names as carry select, carry lookahead, and the Ling pseudocarry. Many implementations are, in fact, hybrids
Addition
American soccer player (born 2005)
look at the U-19/U-20 rosters, dual nationals in limbo, and a weekend lookahead". americansoccernow.com. Ethan Kohler at Major League Soccer Ethan Kohler
Ethan_Kohler
British crime drama
Jimmy Savile drama came to an end". Mzimba, Lizo (26 December 2021). "TV lookahead: 22 highlights to look out for in 2022". BBC News. Retrieved 30 December
The Reckoning (2023 TV series)
The_Reckoning_(2023_TV_series)
"Coffee Girl" "Morning Moon" 2012 "At Transformation" Now for Plan A "The Lookahead" 2016 "In a World Possessed by the Human Mind" Man Machine Poem 2021 "Ouch"
The Tragically Hip discography
The_Tragically_Hip_discography
Method in speedcubing
inspection, enabling the solver to turn at high speeds due to not needing to lookahead or 'figure out things' during the solve. In CFOP, cubers usually predict
CFOP_method
Lossy audio coding format
further 5.0 ms lookahead plus 1.5 ms for resampling, giving a default delay of 26.5 ms. When the CELT layer is active, it requires 2.5 ms lookahead for window
Opus_(audio_format)
1954 film directed by Lewis Allen
ISBN 978-3-946312-51-2. Schaefer, Glen (November 29, 2012). "Glen's lookahead: Uwe Boll back in B.C. for thriller Suddenly; That Burning Feeling Catches
Suddenly_(1954_film)
Circuit that performs subtraction
B_{out}={\bar {X}}B_{in}+{\bar {X}}Y+YB_{in}} Adder (electronics) Carry-lookahead adder Carry-save adder Adding machine Adder–subtractor Foundations Of
Subtractor
Topics referred to by the same term
Local colleges and universities in the Philippines Local currency unit Lookahead Carry Unit Lubbock Christian University This disambiguation page lists
LCU
Telephony speech encoding standard
features a frame size of 22.5 ms. Additionally, the codec requires a large lookahead of 90 ms. In 1998, an improved version[according to whom?] of the standard
FIPS_137
Parser generator written in Java
input tokens, and so can handle LL(k) grammars automatically; by use of "lookahead specifications", it can also resolve choices requiring unbounded look
JavaCC
Combinational digital circuit
Components Adder (+) Adder Half adder Full adder Ripple-carry adder Carry-lookahead adder Brent–Kung adder Kogge–Stone adder Ling adder Carry-save adder Carry-select
Arithmetic_logic_unit
Type of grammar for describing formal languages
string without actually consuming it, they provide a powerful syntactic lookahead and disambiguation facility, in particular when reordering the alternatives
Parsing_expression_grammar
charge. The latency listed here is the total delay (frame size, plus all lookahead) at the normal operating sample rate (typically 44.1 kHz). Lossless compression
Comparison of audio coding formats
Comparison_of_audio_coding_formats
2012 studio album by The Tragically Hip
Fay – drums Additional musicians Sarah Harmer – backing vocals ("The Lookahead" and "Now for Plan A") "THE TRAGICALLY HIP RELEASE 'NOW FOR PLAN A' OCTOBER
Now_for_Plan_A
improving the recognition strength of an LL parser by providing arbitrary lookahead. In their original implementation, syntactic predicates had the form “(
Syntactic_predicate
calculating strong lookahead sets for the elements in the grammar and the second is constructing lookahead paths from the lookahead sets. Lookahead paths group
JetPAG
of features of the library, e.g., GNU grep uses PCRE, but supports no lookahead, though PCRE does. Non-greedy quantifiers match as few characters as possible
Comparison of regular expression engines
Comparison_of_regular_expression_engines
Machine learning optimization algorithm
Youzhi; Kwok, James (2024). "Improving Sharpness-Aware Minimization by Lookahead". International Conference on Learning Representations (ICLR) 2022. Li
Sharpness_aware_minimization
Men's association football team
original on 21 June 2019. Retrieved 21 June 2019. "CONCACAF Gold Cup Lookahead: Sunday Quarterfinals". CONCACAF. 19 June 2011. Archived from the original
Jamaica national football team
Jamaica_national_football_team
Computer processing technique to boost memory performance
itself. Stream buffers were developed based on the concept of "one block lookahead (OBL) scheme" proposed by Alan Jay Smith. Stream buffers are one of the
Cache_prefetching
Model for designing artificial intelligence
have an explicit representation of goals. Lookahead: The architecture does not have (by design) any lookahead deliberation or forward planning. This may
Belief–desire–intention software model
Belief–desire–intention_software_model
Algorithm that multiplies two signed binary numbers in two's complement notation
multiplication by 3 in a way that minimizes latency, combining the use of carry-lookahead, carry-select, and Kogge–Stone addition. Binary multiplier Non-adjacent
Booth's multiplication algorithm
Booth's_multiplication_algorithm
Type of parser
of a simple PEG parser. This was done because PEGs have an unlimited lookahead capability resulting in a parser with exponential time performance in
Packrat_parser
In 2017 Ulya Trafimovich described TDFA with one-symbol lookahead. The use of a lookahead symbol reduces the number of registers and register operations
Tagged Deterministic Finite Automaton
Tagged_Deterministic_Finite_Automaton
Compiler generator
recursive descent; LL(1) conflicts can be resolved by either a multi-symbol lookahead or by semantic checks. Thus the class of accepted grammars is LL(k) for
Coco/R
Projecting human traits onto computers
noted by Charles Babbage. In proposing what would later be called a carry-lookahead adder, Babbage remarked that he found such terms convenient for descriptive
ELIZA_effect
Section of code that details a specific command
This often leads to grammars which are easier to parse, requiring less lookahead. Fortran and PL/1 do not have reserved keywords, allowing statements like:
Statement_(computer_science)
Topics referred to by the same term
Business Association, formerly the Country Landowners' Association Carry-lookahead adder, in digital logic Caseous lymphadenitis, an infectious disease caused
CLA
Parser generator program
the parser class SumParser extends Parser; options { k = 1; // Parser Lookahead: 1 Token } // Definition of an expression statement: INTEGER (PLUS^ INTEGER)*;
ANTLR
Total quantity of money borrowed by the Government of the United Kingdom
Times. Retrieved 5 October 2017. Sunday with Laura Kuenssberg - Budget Lookahead. Retrieved 27 November 2025 – via www.bbc.co.uk. Eaton, George (25 November
United_Kingdom_national_debt
Class in computational complexity theory
performed in sequence. One might contrast ripple carry adder with a carry-lookahead adder. An example of problem in NC1 is the parity check on a bit string
NC_(complexity)
CNBC Program
immediately follows Worldwide Exchange in the US and Asia), and the "US Lookahead." At the end of the broadcast, before the three anchors signed off, the
Worldwide_Exchange
Computer program for the Boolean satisfiability problem
Siert; Biere, Armin (2012), "Cube and Conquer: Guiding CDCL SAT Solvers by Lookaheads", Hardware and Software: Verification and Testing, Lecture Notes in Computer
SAT_solver
Codec library implementing VP8 and VP9 encoders and decoders
configuring encoding expense independently from decoding complexity. A lookahead of up to 25 frames can be configured, which improves compression efficiency
Libvpx
Light rail station in Newton, Massachusetts, US
Department of System-Wide Accessibility. May 2022. p. 3. "Week in Review and Lookahead: Friday, December 2, 2022" (PDF). Massachusetts Bay Transportation Authority
Newton_Highlands_station
4-bit arithmetic logic unit and function generator 24 SN74LS181 74x182 1 lookahead carry generator 16 SN74S182 74x183 2 dual carry-save full adder 14 SN74LS183
List of 7400-series integrated circuits
List_of_7400-series_integrated_circuits
architecture: using GA to find out weak links in approximate computing such as lookahead. Configuration applications, particularly physics applications of optimal
List of genetic algorithm applications
List_of_genetic_algorithm_applications
Paradigm of rule-based machine learning methods
Programming Conference, pp. 658–664, 1998. Riolo, Rick L. (1990-01-01). Lookahead Planning and Latent Learning in a Classifier System. Cambridge, MA, USA:
Learning_classifier_system
American computer company
re-designed Sigma 6. The Xerox Sigma 9 was a major re-design with instruction lookahead and other advanced features, while the Sigma 8 and Sigma 9 mod 3 were
Scientific_Data_Systems
Form of backgammon
(maximising expected value) and tactical play (one-, two-, or three-move lookahead). Therefore, strategies that foreground the expectation of the opponent
Trictrac
JavaScript and WebAssembly engine
exceptions, regex enhancements (non-greedy quantifiers, non-capturing groups, lookahead assertions, m flag), Number formatting methods (toExponential, toFixed
SpiderMonkey
Retrieved June 16, 2023. Schlabach, Mark (June 15, 2023). "U.S. Open 2023: Lookahead to the second round". ESPN. Archived from the original on June 16, 2023
2023_U.S._Open_(golf)
Open-source library for pattern matching in text
Trofimovich, Ulya (2019). "Tagged Deterministic Finite Automata with Lookahead". arXiv:1907.08837 [cs.FL]. practical improvements .. Lurikari algorithm
TRE_(computing)
Digital circuit
but decided against them. Misprediction recovery was provided by the lookahead unit on Stretch, and part of Stretch's reputation for less-than-stellar
Branch_predictor
Computer backgammon program (1992)
each turn all possible legal moves and all their possible responses (lookahead search), feeds each resulting board position into its evaluation function
TD-Gammon
Decentralized distributed system with lookup service
Moni Naor, and Udi Wieder. "Know thy Neighbor's Neighbor: the Power of Lookahead in Randomized P2P Networks" Archived 2008-04-20 at the Wayback Machine
Distributed_hash_table
Parsing technique
For an ambiguous language to be parsed by an LL parser, the parser must lookahead more than 1 symbol, e.g. LL(3). The common solution to this problem is
Top-down_parsing
Algorithms which recursively solve subproblems
Siert; Biere, Armin (2012), "Cube and Conquer: Guiding CDCL SAT Solvers by Lookaheads", Hardware and Software: Verification and Testing, Lecture Notes in Computer
Divide-and-conquer_algorithm
2009 virtual card game
game's artificial intelligence (AI) is based on creating a multistep "lookahead" decision tree from the current state of the board, evaluating possible
Magic: The Gathering – Duels of the Planeswalkers
Magic:_The_Gathering_–_Duels_of_the_Planeswalkers
Light rail system
Bay Transportation Authority. May 20, 2019. "GLTPS Monthly Review and Lookahead" (PDF). Massachusetts Bay Transportation Authority. December 15, 2021
Green_Line_(MBTA)
8-bit microprocessor
load made the historic Intel 8008 processor possible". — (November 2020). "Reverse-engineering the carry-lookahead circuit in the Intel 8008 processor".
Intel_8008
2022 British television programme
Stop the Boats?". BBC. 16 November 2025. Retrieved 1 March 2026. "Budget Lookahead". BBC. 23 November 2025. Retrieved 1 March 2026. "Interview with the Chancellor"
Sunday_with_Laura_Kuenssberg
Algorithm
the previously calculated g-value (start distance) as in A* rhs(n), a lookahead value based on the g-values of the node's predecessors (the minimum of
Lifelong_Planning_A*
2014 Canadian film
Shadowboxer"". Canadian Animation Blog. Retrieved 9 June 2017. "TIFF 2014 Lookahead: A surge of short films". Maclean's, August 31, 2014. "Toronto: 'The Imitation
The Weatherman and the Shadowboxer
The_Weatherman_and_the_Shadowboxer
Tree data structure
databases by Tokutek. Originally, it was implemented as a cache-oblivious lookahead array, but the current implementation is an extension of the Bε tree.
Fractal_tree_index
1109/12.214688. Yu-Ting Pai; Yu-Kumg Chen (January 2004). The fastest carry lookahead adder (PDF). Second IEEE International Workshop on Electronic Design,
Redundant binary representation
Redundant_binary_representation
Open source audio software
Multiband Gate: multiband noise gate with four individual bands Limiter: lookahead limiter with automatic sustain control Multiband Limiter: multiband limiter
Calf_Studio_Gear
First arithmetic logic unit (ALU) on a single chip
F is the number output. There are also P and a G signals for a carry-lookahead adder, which can be implemented via one or several 74182 chips. In the
74181
Software Logic Levels 1984 Fisher-Price Lone Raider (The) 1983 Atari UK Lookahead 1981 APX Lord of the Orb 1985 Antic Software Lords of Conquest 1986 Electronic
List of Atari 8-bit computer games
List_of_Atari_8-bit_computer_games
Campbell TV simulcast to start this month". rxtvinfo.com. 6 April 2023. "TV lookahead: 23 highlights to look out for in 2023". 26 December 2022. Retrieved 21
Timeline_of_BBC_Two
Language models designed for reasoning tasks
pick a whole response. Beam search performs better than greedy search. Lookahead search is another tree search method. The policy proposes several next
Reasoning_model
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