Features
LispPad's Scheme language provides support for the following core language features, many of which are derived from the R7RS (small) Scheme standard:
- Modules via R7RS libraries
- Hygienic macros based on the syntax-rules standard
- First-class environments
call/cc,dynamic-windand exceptions- Dynamically-scoped paramaters
- Multiple return values
- Delayed execution via promises and streams
- Support for the full numerical tower consisting of arbitrary size integers, rationals, real numbers, and inexact complex numbers.
- Unicode strings and characters
- Vectors and bytevectors
- Text and binary ports
- R7RS-compliant records
- R6RS-compliant hashtables
- R6RS-compliant enumerations
Included Libraries
LispPad supports all standard R7RS (small) libraries:
(scheme base)(scheme case-lambda)(scheme char)(scheme complex)(scheme cxr),(scheme eval)(scheme file)(scheme inexact)(scheme lazy)(scheme load)(scheme process-context)(scheme read)(scheme repl)(scheme time)(scheme write)(scheme r5rs)
Most of the R7RS (large) libraries from the "Red" and "Tangerine" edition are supported as well:
(scheme box)(scheme charset)(scheme comparator)(scheme generator)(scheme hash-table)(scheme ideque)(scheme list)(scheme mapping)(scheme rlist)(scheme set)(scheme sort)(scheme stream)(scheme text)(scheme vector)
LispPad also includes all the LispKit libraries:
(lispkit box)(lispkit char)(lispkit char-set)(lispkit clos)(lispkit control)(lispkit core)(lispkit datatype)(lispkit date-time)(lispkit draw)(lispkit draw turtle)(lispkit dynamic)(lispkit enum)(lispkit gvector)(lispkit hashtable)(lispkit heap)(lispkit iteration)(lispkit json)(lispkit list)(lispkit log)(lispkit logic)(lispkit object)(lispkit pdf)(lispkit prettify)(lispkit queue)(lispkit set)(lispkit stack)(lispkit string)(lispkit system)(lispkit test)(lispkit type)(lispkit vector)(lispkit wt-tree)
LispPad currently comes with two LispPad-specific libraries providing a native integration of drawings defined via (lispkit draw) and (lispkit draw turtle) and a means to script the application. There is also a LispPad-specific logging library which extends the LispKit logging library.
(lisppad log)(lisppad system)(lisppad turtle)
The following SRFI (Scheme Request for Implementation) libraries have been ported to LispPad and are included in the latest LispPad distribution:
- SRFI 1: List Library
- SRFI 2: AND-LET* - an AND with local bindings, a guarded LET* special form
- SRFI 8: receive - Binding to multiple values
- SRFI 11: Syntax for receiving multiple values
- SRFI 14: Character-set library
- SRFI 16: Syntax for procedures of variable arity
- SRFI 17: Generalized set!
- SRFI 19: Time Data Types and Procedures
- SRFI 23: Error reporting mechanism
- SRFI 27: Sources of Random Bits
- SRFI 28: Basic Format Strings
- SRFI 31: A special form rec for recursive evaluation
- SRFI 33: Integer Bitwise-operation Library
- SRFI 34: Exception Handling for Programs
- SRFI 35: Conditions
- SRFI 39: Parameter objects
- SRFI 41: Streams
- SRFI 46: Basic Syntax-rules Extensions
- SRFI 48: Intermediate Format Strings
- SRFI 51: Handling rest list
- SRFI 55: require-extension
- SRFI 63: Homogeneous and Heterogeneous Arrays
- SRFI 64: A Scheme API for test suites
- SRFI 69: Basic hash tables
- SRFI 95: Sorting and Merging
- SRFI 101: Purely Functional Random-Access Pairs and Lists
- SRFI 111: Boxes
- SRFI 112: Environment inquiry
- SRFI 113: Sets and bags
- SRFI 121: Generators
- SRFI 125: Intermediate hash tables
- SRFI 128: Comparators
- SRFI 129: Titlecase procedures
- SRFI 132: Sort Libraries
- SRFI 133: Vector Library
- SRFI 134: Immutable Deques
- SRFI 135: Immutable Texts
- SRFI 137: Minimal Unique Types
- SRFI 142: Bitwise Operations
- SRFI 145: Assumptions
- SRFI 151: Bitwise Operations
- SRFI 152: String Library
- SRFI 158: Generators and Accumulators
- SRFI 161: Unifiable Boxes
- SRFI 165: The Environment Monad
- SRFI 173: Hooks
The source code of the Scheme interpreter and the included libraries has been open-sourced and published at GitHub. Example code and the Scheme sources of the included libraries can be found here.
It is also possible to access the source code from within LispPad. Pressing option while opening the File menu will reveal a menu item "Open LispKit…" which provides access to the LispKit source code bundled with LispPad. Similarly, pressing control while opening the File menu will reveal a menu item "Open LispPad..." for accessing the LispPad-specific code, e.g like the LispPad prelude.