12.9 Reader Extension

► |  | Reference: Racket

1 | Language Model
2 | Syntactic Forms
3 | Datatypes
4 | Structures
5 | Classes and Objects
6 | Units
7 | Contracts
8 | Pattern Matching
9 | Control Flow
10 | Concurrency
11 | Macros
12 | Input and Output
13 | Reflection and Security
14 | Operating System
15 | Memory Management
16 | Unsafe Operations
17 | Running Racket
| Bibliography
| Index

► | 12 | Input and Output

12.1 | Ports
12.2 | Byte and String Input
12.3 | Byte and String Output
12.4 | Reading
12.5 | Writing
12.6 | The Reader
12.7 | The Printer
12.8 | Pretty Printing
12.9 | Reader Extension
12.10 | Printer Extension
12.11 | Serialization

▼ | 12.9 | Reader Extension

12.9.1 | Readtables
12.9.2 | Reader-Extension Procedures
12.9.3 | Special Comments

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#### 12.9`` Reader Extension

Racket’s reader can be extended in three ways: through a reader-macro procedure in a readtable (see Readtables), through a #reader form (see Reading via an Extension), or through a custom-port byte reader that returns a “special” result procedure (see Custom Ports). All three kinds of reader extension procedures accept similar arguments, and their results are treated in the same way by read and read-syntax (or, more precisely, by the default read handler; see port-read-handler).

12.9.1 Readtables
12.9.2 Reader-Extension Procedures
12.9.3 Special Comments

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