Reference: PLT Scheme

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`` | Running PLT Scheme
| Bibliography
| Index

Version: 4.0.2
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#### 12.9`` Reader Extension

Scheme’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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