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The Kawa Scheme language: Top
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description: The Kawa Scheme language: Top
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The Kawa Scheme language Table of Contents 1 News - Recent Changes 2 Features 2.1 Implemented SRFIs 2.2 Compatibility with standards 3 The Kawa Community 3.1 Reporting bugs 3.2 General Kawa email and discussion 3.3 Acknowledgements and thanks 3.4 Technical Support for Kawa 3.5 Projects using Kawa 3.6 Ideas and tasks for contributing to Kawa 3.6.1 Run interactive process in separate Java Virtual Machine: 3.6.2 Better dynamic reload 3.6.3 Easier Access to Native Libraries using JNA/JNR 3.6.4 Types for units 3.6.5 Compiler should use class-file reading instead of reflection 3.6.6 Mutually dependent Java and Scheme modules 3.6.7 Use Java-7 MethodHandles and invokedynamic 3.6.8 Parameterized types 3.6.9 Optimized function types and values using MethodHandles 3.6.10 Full continuations 3.6.11 Faster tailcalls 3.6.12 TreeList-optimization 3.6.13 Asynchronous evaluation 3.6.14 REPL console and other REPL improvement 3.6.15 XQuery-3.0 functionality 3.6.16 XQuery-updates 3.6.17 Common Lisp support 3.6.18 JEmacs improvements 3.6.19 Improved IDE integration 3.6.19.1 Plugin for NetBeans IDE 3.6.19.2 Plugin for Eclipse IDE 3.6.19.3 Improve Emacs integration 3.6.20 Hop-style web programming 3.6.21 String localization 3.6.22 Data binding 3.6.23 Decimal arithmetic and repeated decimals 3.6.24 Optional strict typing along with an explicit dynamic type 4 Getting and installing Kawa 4.1 Getting Kawa 4.1.1 Getting the development sources using Git 4.2 Getting and running Java 4.3 Installing and using the binary distribution 4.4 Installing and using the source distribution 4.4.1 Build Kawa using configure and make 4.4.1.1 Configure options 4.4.1.2 Building on Windows using MinGW 4.4.1.3 Building on Windows using Cygwin 4.4.2 Building the documentation 4.4.2.1 Plain HTML documentation 4.4.2.2 Fancier HTML documentation 4.4.2.3 Using ebook readers or the –browse-manual option 4.4.2.4 Building a printable PDF file 4.4.3 Build Kawa using ant 5 Kawa Scheme Tutorial 5.1 Introduction 5.2 Booleans 5.3 Numbers 5.4 Functions 5.5 Variables 5.6 Composable pictures 5.7 Lists and sequences 5.8 Creating and using objects 5.9 Types and declarations 5.10 Exceptions and errors 5.11 Classes 5.12 Other Java features Reference Documentation 6 How to start up and run Kawa 6.1 Command-line arguments 6.1.1 Argument processing 6.1.2 General options 6.1.3 Options for language selection 6.1.4 Options for warnings and errors 6.1.5 Options for setting variables 6.1.6 Options for the REPL console 6.1.7 Options for controlling output formatting 6.1.8 Options for compiling and optimizing 6.1.9 Options for debugging 6.1.10 Options for web servers 6.1.11 Options for the JVM 6.2 Running Command Scripts 6.2.1 Setting kawa options in the script 6.2.2 Other ways to pass options using meta-arg or –script 6.2.3 Scripts for compiled code 6.3 The REPL (read-eval-print-loop) console 6.3.1 Input line editing and history 6.3.2 Running a Command Interpreter in a new Window 6.3.3 Using DomTerm 6.4 Exiting Kawa 6.5 Compiling to byte-code 6.5.1 Compiling to a set of .class files 6.5.2 Compiling to an archive file 6.5.3 Compiling using Ant 6.5.4 Compiling to a standalone application 6.5.5 Compiling to an applet 6.5.6 Compiling to a native executable 7 Syntax 7.1 Notation 7.2 Lexical and datum syntax 7.3 Lexical syntax 7.3.1 Formal account 7.3.2 Line endings 7.3.3 Whitespace and comments 7.3.4 Identifiers 7.3.5 Numbers 7.4 Datum syntax 7.4.1 Datum labels 7.4.2 Abbreviations 7.5 Hash-prefixed forms 7.6 Primitive expression syntax 7.6.1 Literal expressions 7.6.2 Variable references 7.6.3 Procedure calls 7.7 Property access using colon notation 7.7.1 Part lookup rules 7.7.2 Specific cases 7.7.2.1 Invoking methods 7.7.2.2 Accessing fields 7.7.2.3 Type literal 7.7.2.4 Type cast 7.7.2.5 Type test 7.7.2.6 New object construction 7.7.2.7 Getting array length 7.8 Programs and Bodies 7.9 Syntax and conditional compilation 7.10 Macros 7.10.1 Pattern language 7.10.2 Identifier predicates 7.10.3 Syntax-object and datum conversions 7.10.4 Signaling errors in macro transformers 7.10.5 Convenience forms 7.11 Named quasi-literals 8 Program structure 8.1 Boolean values 8.2 Conditionals 8.3 Variables and Patterns 8.3.1 Patterns 8.4 Definitions 8.5 Local binding constructs 8.6 Lazy evaluation 8.6.1 Delayed evaluation 8.6.2 Implicit forcing 8.6.3 Blank promises 8.6.4 Lazy and eager types 8.7 Threads 8.8 Exception handling 8.8.1 Simple error objects 8.8.2 Named exceptions 8.8.3 Native exception handling 9 Control features 9.1 Mapping functions 9.2 Multiple values 10 Symbols and namespaces 10.1 Simple symbols 10.2 Namespaces and compound symbols 10.2.1 Namespace objects 10.2.2 Compound symbols 10.2.3 Namespace aliases 10.3 Keywords 10.4 Special named constants 11 Procedures 11.1 Application and Arguments Lists 11.1.1 Arguments lists 11.1.2 Explicit argument list objects 11.1.3 Argument list library 11.1.4 Apply procedures 11.2 Procedure properties 11.2.1 Standard properties 11.3 Generic (dynamically overloaded) procedures 11.4 Extended Formal Arguments List 11.5 Partial application 12 Quantities and Numbers 12.1 Numerical types 12.1.1 Exactness 12.1.2 Numerical promotion and conversion 12.2 Arithmetic operations 12.3 Numerical input and output 12.4 Quaternions 12.4.1 The (kawa quaternions) module 12.4.2 The (kawa rotations) module 12.4.2.1 Rotation Representation Conversions 12.4.2.2 Rotation Operations 12.5 Quantities and Units 12.6 Logical Number Operations 12.6.1 SRFI-60 Logical Number Operations 12.6.2 Deprecated Logical Number Operations 12.7 Performance of numeric operations 13 Characters and text 13.1 Characters 13.2 Character sets 13.3 Strings 13.3.1 Basic string procedures 13.3.2 Immutable String Constructors 13.3.3 Selection 13.3.4 String Comparisons 13.3.5 Conversions 13.3.6 Searching and matching 13.3.7 Concatenation and replacing 13.3.8 Mapping and folding 13.3.9 Replication & splitting 13.3.10 String mutation 13.3.11 Strings as sequences 13.3.11.1 Indexing a string 13.3.11.2 Indexing with a sequence 13.3.12 String Cursor API 13.4 String literals 13.4.1 Simple string literals 13.4.2 String templates 13.4.2.1 Special characters 13.4.2.2 Multiline string literals 13.4.2.3 Embedded expressions 13.4.2.4 Formatting 13.5 Unicode character classes and conversions 13.5.1 Characters 13.5.2 Deprecated in-place case modification 13.6 Regular expressions 13.6.1 Java regular expressions 13.6.2 Portable Scheme regular expressions 14 Data structures 14.1 Sequences 14.2 Lists 14.2.1 SRFI-1 list library 14.2.2 SRFI-101 Purely Functional Random-Access Pairs and Lists 14.3 Vectors 14.4 Uniform vectors 14.4.1 Relationship with Java arrays 14.5 Bytevectors 14.5.1 Converting to or from strings 14.6 Ranges 14.7 Streams - lazy lists 14.8 Multi-dimensional Arrays 14.8.1 Array shape 14.8.2 Array types 14.8.3 Array literals and printing 14.8.4 Array construction 14.8.5 Array indexing 14.8.6 Modifying arrays 14.8.7 Transformations and views 14.8.8 Miscellaneous 14.9 Hash tables 14.9.1 R6RS hash tables 14.9.1.1 Procedures 14.9.1.2 Inspection 14.9.1.3 Hash functions 14.9.2 SRFI-69 hash tables 14.9.2.1 Type constructors and predicate 14.9.2.2 Reflective queries 14.9.2.3 Dealing with single elements 14.9.2.4 Dealing with the whole contents 14.9.2.5 Hash functions 15 Eval and Environments 15.1 Locations 15.2 Parameter objects 16 Debugging 17 Input, output, and file handling 17.1 Named output formats 17.2 Paths - file name, URLs, and URIs 17.2.1 Extracting Path components 17.3 File System Interface 17.4 Reading and writing whole files 17.4.1 Reading a file 17.4.2 Blobs 17.4.3 Writing to a file 17.4.4 Functions 17.5 Ports 17.5.1 String and bytevector ports 17.5.2 Input 17.5.3 Output 17.5.4 Prompts for interactive consoles (REPLs) 17.5.5 Line numbers and other input port properties 17.5.6 Miscellaneous 17.6 Formatted Output (Common-Lisp-style) 17.6.1 Implemented CL Format Control Directives 17.6.2 Formatting Integers 17.6.3 Formatting real numbers 17.6.4 Miscellaneous formatting operators 17.6.5 Unimplemented CL Format Control Directives 17.6.6 Extended, Replaced and Additional Control Directives 17.7 Pretty-printing 17.7.1 Pretty-printing Scheme forms 17.7.2 Generic pretty-printing functions 17.8 Resources 18 Types 18.1 Standard Types 18.2 Parameterized Types 18.3 Type tests and conversions 19 Object, Classes and Modules 19.1 Defining new classes 19.1.1 General class properties 19.1.2 Declaring fields 19.1.3 Declaring methods 19.1.4 Example 19.2 Anonymous classes 19.2.1 Lambda as shorthand for anonymous class 19.3 Enumeration types 19.4 Annotations of declarations 19.5 Modules and how they are compiled to classes 19.5.1 Name visibility 19.5.2 R7RS explicit library modules 19.5.3 How a module becomes a class 19.5.4 Same class for module and defined class 19.5.5 Static vs non-static modules 19.5.6 Module options 19.6 Importing from a library 19.6.1 Searching for modules 19.6.2 Searching for source files 19.6.3 Builtin libraries 19.6.4 Importing a SRFI library 19.6.5 Importing from a plain class 19.7 Record types 19.8 Creating New Record Types On-the-fly 19.9 Calling Java methods from Scheme 19.9.1 Calling static methods using colon notation 19.9.2 Calling instance methods using colon notation 19.9.3 Method names 19.9.4 Invoking a method with the invoke function 19.9.5 Using a namespace prefix 19.10 Allocating objects 19.11 Accessing object fields 19.11.1 Accessing static fields and properties 19.11.2 Accessing instance fields and properties 19.11.3 Using field and static-field methods 19.11.4 Older colon-dot notation 19.12 Mapping Scheme names to Java names 19.13 Scheme types in Java 19.14 Using Java Arrays 19.14.1 Creating new Java arrays 19.14.2 Accessing Java array elements 19.14.3 Old low-level array macros 19.15 Loading Java functions into Scheme 19.16 Evaluating Scheme expressions from Java 19.16.1 Using javax.script portable Java scripting 20 Working with XML and HTML 20.1 Formatting XML 20.2 Creating HTML nodes 20.3 Creating XML nodes 20.4 XML literals 20.4.1 Element constructors 20.4.2 Elements contents (children) 20.4.3 Attributes 20.4.4 QNames and namespaces 20.4.5 Other XML types 20.4.5.1 Processing instructions 20.4.5.2 XML comments 20.4.5.3 CDATA sections 20.5 Web page scripts 20.6 Self-configuring web page scripts 20.6.1 Using the OpenJDK built-in web server 20.6.2 Using a servlet container 20.6.3 Finding a matching script 20.6.4 Determining script language 20.6.5 Compilation and caching 20.7 Installing web page scripts as Servlets 20.7.1 Creating a web application 20.7.2 Compiling a web page script to a servlet 20.7.3 Installing a servlet under Tomcat 20.7.4 Installing a servlet under Glassfish 20.7.5 Servlet-specific script functions 20.8 Installing Kawa programs as CGI scripts 20.9 Functions for accessing HTTP requests 20.9.1 Request URL components 20.9.2 Request parameters 20.9.3 Request headers 20.9.4 Request body 20.9.5 Request IP addresses and ports 20.9.6 Miscellaneous request properties 20.10 Generating HTTP responses 20.11 Using non-Scheme languages for XML/HTML 20.11.1 XQuery language 20.11.2 XSL transformations 20.11.3 KRL - The Kawa Report Language for generating XML/HTML 20.11.4 Differences between KRL and BRL 21 Miscellaneous topics 21.1 Composable pictures 21.1.1 Coordinates - points and dimensions 21.1.2 Shapes 21.1.3 Colors and paints 21.1.4 Filling a shape with a color 21.1.5 Stroking (outlining) a shape 21.1.6 Affine transforms 21.1.7 Combining pictures 21.1.8 Images 21.1.9 Compositing - Controlling how pictures are combined 21.1.10 Displaying and exporting pictures 21.1.10.1 Export to SVG 21.1.10.2 Display in Swing 21.1.10.3 Convert to image 21.2 Building JavaFX applications 21.2.1 Using JavaFX with JDK 7 21.3 Building for Android 21.3.1 Downloading and setting up the Android SDK 21.3.2 Building Kawa for Android 21.3.3 Creating the application 21.3.4 Running the application on the Android emulator 21.3.5 Running the application on your device 21.3.6 Some debugging notes 21.3.7 Other resources 21.4 Android view construction 21.4.1 View object allocation 21.4.2 Event handlers 21.5 System inquiry 21.6 Processes 21.6.1 Creating a process 21.6.2 Process literals 21.6.3 Process values and process output 21.6.4 Substitution and tokenization 21.6.5 Input/output redirection 21.6.6 Pipe-lines 21.6.7 Setting the process environment 21.6.8 Waiting for process exit 21.6.9 Exiting the current process 21.6.10 Deprecated functions 21.7 Time-related functions 21.8 Deprecated low-level functions 21.8.1 Low-level Method invocation 21.8.2 Low-level field operations 21.8.3 Old low-level array macros 22 Frequently Asked Questions 23 The Kawa language framework 24 License 24.1 License for the Kawa software 24.2 License for the Kawa manual Appendix A Index Next: Installation , Previous: (dir) , Up: (dir) [ Contents ][ Index ] The Kawa Scheme language Kawa is a general-purpose programming language that runs on the Java platform. It aims to combine: the benefits of dynamic scripting languages (non-verbose code with less boiler-plate, fast and easy start-up, a REPL , no required compilation step); with the benefits of traditional compiled languages (fast execution, static error detection, modularity, zero-overhead Java platform integration). It is an extension of the long-established Scheme language, which is in the Lisp family of programming languages. Kawa has many useful features . Kawa is also a useful framework for implementing other programming languages on the Java platform. It has many useful utility classes. This manual describes version 2.93, updated 5 July 2017. See the summary of recent changes . The Kawa home page (which is currently just an on-line version of this document) is http://www.gnu.org/software/kawa/ . The Kawa tutorial is useful to get stated. While it is woefully incomplete, it does link to some other more in-depth (but not Kawa-specific) Scheme tutorials. For copyright information on the software and documentation, see License . Various people and orgnizations have contributed to Kawa . This package has nothing to do with the defunct Kawa commercial Java IDE. • News : News - Recent Changes • Features : • Community : • Installation : Building and installing Kawa • Tutorial : Kawa Scheme Tutorial • Running : Invoking, Running, and Using Kawa • Syntax : • Program structure : • Control features : • Symbols and namespaces : • Procedures : • Numbers : Quantities and Numbers • Characters and text : • Data structures : • Eval and Environments : • Debugging : • Input-Output : Input, output, and file handling • Types : • Objects Classes and Modules : • XML tools : XML, HTML, and the web • Miscellaneous : • FAQs : Frequently Asked Questions • Framework : The Kawa language framework • License : • Overall Index : Index of functions, macros, concepts, and more. Next: Installation , Previous: (dir) , Up: (dir) [ Contents ][ Index ] ...
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