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Wiki Article · Cinematic
Lexer
Overview
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Lexer —
Quick Facts
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Property: Detail
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Topic: Lexer / Lexical Analyzer /…
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Category: Compiler Theory / Language…
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Also Known As: Scanner, Tokenizer, Lexical…
Topic 1
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Lead
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Lexer (ya lexical analyzer, ya tokenizer) wo software component hai jo ek raw character…
Topic 2
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Infobox
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| Property | Detail | |---|---| | Topic | Lexer / Lexical Analyzer / Tokenizer | |…
Topic 3
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Bunyaadi Concept — Lexer Ka Matlab
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total → Identifier token
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= → Assignment operator token
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price → Identifier token
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+ → Plus operator token
Topic 4
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Lexer Ka Role in Compilation Pipeline
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`mermaid flowchart LR SRC[Source Code\nCharacter Stream] LEX[Lexer\nLexical Analyzer]…
Topic 5
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Token Types
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Type: Enum/constant — KEYWORD,…
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Value/Lexeme: Actual text —…
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Position: Line number + column…
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Metadata (optional): File name,…
Topic 6
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How a Lexer Works — Step by Step
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Finite State Machine (FSM): States…
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Regular Expressions: Har token…
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Input: integer
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Possible matches: int (keyword, 3…
Topic 7
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Lexer Approaches
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Production compiler: Hand-written…
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Prototype/learning: Regex-based…
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Complex language: ANTLR…
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Embedded system: re2c (generates…
Topic 8
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Lexer vs. Parser
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| Aspect | Lexer | Parser | |---|---|---| | Input | Character stream | Token stream | |…
Topic 9
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Famous Lexer Tools
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| Tool | Language | Type | Year | Notable Feature | |---|---|---|---|---| | Lex | C |…
Topic 10
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Real-World Applications
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Syntax highlighting: IDE me lexer…
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Code completion: Lexer current…
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Error squiggles: Lexer invalid…
Topic 11
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Benefits
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1. Foundation of Language Processing: Lexer ke bina koi compiler, interpreter, ya parser…
Topic 12
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Challenges
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1. Unicode Complexity: Modern languages Unicode support karte hain — multi-byte…
Topic 13
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Glossary
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| Term | Definition | |---|---| | Lexer | Software component jo character stream ko token…
Comparison
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Lexer vs. Parser
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Input: Character stream
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Output: Token stream
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Pattern Type: Regular expressions / FSM
Diagram
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Visual Flow
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Diagram visualization — details in narration
Related Topics
See
Also
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Parser
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Compiler
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Abstract Syntax Tree
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Interpreter.md)
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Regular Expression
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Finite State Machine
Quick Quiz
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QUIZ TIME
Quiz —
Question 1
Lexer ka 'Topic' kya hai?
A
Lexer / Lexical Analyzer / Tokenizer
B
Koi specific nahi
C
Yeh define nahi kiya ja sakta
D
Sab kuch possible hai
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