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Text of the page (random words):
ific languages or dialects carl sassenrath 8 douglas crockford known for his involvement in the development of javascript has described rebol as a more modern language but with some very similar ideas to lisp in that it s all built upon a representation of data which is then executable as programs and as one of json s influences 5 originally the language and its official implementation were proprietary and closed source developed by rebol technologies following discussion with lawrence rosen 9 the rebol version 3 interpreter was released under the apache 2 0 license on december 12 2012 10 older versions are only available in binary form and no source release for them is planned rebol has been used to program internet applications both client and server side database applications utilities and multimedia applications 6 etymology edit rebol was initially an acronym for r elative e xpression b ased o bject l anguage written in all caps 6 8 to align with modern trends in language naming represented e g by the change replacing historical name lisp by lisp programmers ceased the practice of writing rebol in all caps sassenrath eventually put the naming question to the community debate on his blog 11 in subsequent writing sassenrath adopted the convention of writing the language name as rebol 12 history edit first released in 1997 rebol was designed over a 20 year period by carl sassenrath the architect and primary developer of amigaos based on his study of denotational semantics and using concepts from the programming languages lisp forth logo and self rebol technologies was founded in 1998 rebol 2 the interpreter which became the core of extended interpreter editions was first released in 1999 rebol command which added strong encryption and odbc access was released in september 2000 rebol view was released in april 2001 adding graphical abilities on the core language rebol ios an extensible collaboration environment built with rebol was released in august 2001 rebol sdk providing a choice of kernels to bind against as well as a preprocessor was released in december 2002 rebol 3 r3 the newest version of the interpreter had alpha versions released by rebol technologies since january 2008 since its release as an apache 2 project in december 2012 it is being developed by the rebol community 13 design edit ease of use edit one of the rebol design principles is to do simple things in simple ways 6 in the following example the visual interface dialect is used to describe a simple hello world program with a graphical user interface view layout text hello world button quit quit this is how a similar example looks in r3 gui view text hello world button quit on action quit dialects edit rebol domain specific languages called dialects are micro languages optimized for a specific purpose dialects can be used to define business rules graphical user interfaces or sequences of screens during the installation of a program users can define their own dialects reusing any existing rebol word and giving it a specific meaning in that dialect 6 dialects are interpreted by functions processing rebol blocks or parsing strings in a specific way an example of rebol s dialecting abilities can be seen with the word return in the data exchange dialect return is just a word not having any specific meaning in the do dialect return is a global variable referring to a native function passing back a function result value 4 in the visual interface dialect vid return is a keyword causing the layout engine to simulate a carriage return moving the rendering pen down to the beginning of the next line 7 a rebol interpreter with graphical abilities must understand and interpret many dialects the table below lists the most important ones in order of significance dialect name interpreted by purpose data exchange dialect load function represents data and metadata common platform for rebol dialects do dialect do function programming parse dialect parse function pattern matching function specification dialect make function function definition functional programming object specification dialect make function object definition inheritance prototype based programming visual interface dialect vid or rebgui layout function or display function specifies graphical user interface draw dialect view function defines graphical elements lines polygons etc script specification dialect do function script definition security policy dialect secure function specifies security policy syntax edit rebol syntax is free form not requiring specific positioning however indentation is often used to better convey the structure of the text to human readers syntactic properties of different dialects may differ the common platform for all rebol dialects is the data exchange dialect other dialects are usually derived from it in addition to being the common platform for all dialects the data exchange dialect is directly used to represent data and metadata populate data structures send data over internet and save them in data storage in contrast to programming languages like c the data exchange dialect does not consist of declarations statements expressions or keywords a valid data exchange dialect text stream is a tree data structure consisting of blocks the root block is implicit subblocks are delimited by square brackets parens delimited by round brackets strings delimited by double quotes or curly brackets suitable for multi line strings caret notation is used for unprintable characters urls e mail addresses files paths or other composite values unlike algol blocks rebol blocks are composite values similar to quoted s expressions in lisp the fact that code is written in the form of rebol blocks makes the language homoiconic 4 blocks as well as parens may contain other composite values a block may contain subblocks parens strings or scalar values like words set words words suffixed by the colon get words words prefixed by the colon lit words words prefixed by the apostrophe numbers money characters etc separated by whitespace note that special characters are allowed in words so a b is a word unlike a b which is a sequence of three words separated by spaces comments may appear following the semicolon until the end of the line multi line comments or comments not ignored by the lexical parser can be written using ordinary datatypes like multi line strings 4 semantics edit blocks containing domain specific language can be submitted as arguments to specific evaluator functions 6 do edit the most frequently used evaluator is the do function it is used by default to interpret the text input to the interpreter console the do dialect interpreted by the do function is an expression oriented sublanguage of the data exchange dialect the main semantic unit of the language is the expression in contrast to imperative programming languages descending from algol the do dialect has neither keywords nor statements words are used as case insensitive variables like in all dynamically typed languages variables don t have an associated type type is associated with values the result i e the evaluation of a word is returned when a word is encountered by the do function the set word form of a word can be used for assignment while not having statements assignment together with functions with side effects can be used for imperative programming 4 subblocks of the root block evaluate to themselves this property is used to handle data blocks for structured programming by submitting blocks as arguments to control functions like if either loop etc and for dialecting when a block is passed to a specific interpreter function 6 a specific problem worth noting is that composite values assigned to variables are not copied to make a copy the value must be passed to the copy function 4 the do function normally follows a prefix style of evaluation where a function processes the arguments that follow it however infix evaluation using infix operators exists too infix evaluation takes precedence over the prefix evaluation for example abs 2 3 returns 1 since the infix addition takes precedence over the computation of the absolute value when evaluating infix expressions the order of evaluation is left to right no operator takes precedence over another for example 2 3 4 returns 20 while an evaluation giving precedence to multiplication would yield 14 all operators have prefix versions do usually evaluates arguments before passing them to a function so the below expression print read http en wikipedia org wiki rebol first reads the wikipedia rebol page and then passes the result to the print function parentheses can be used to change the order of evaluation using prefix notation the usage of parentheses in expressions can be avoided 4 the simple precedence rules are both an advantage no need to consult precedence tables when writing expressions no need to rewrite precedence tables when a new operator is defined expressions can be easily transliterated from infix to prefix notation and vice versa as well as a disadvantage users accustomed to more conventional precedence rules may easily make a mistake 6 parse edit the parse function is preferably used to specify validate transform and interpret dialects it does so by matching parse expressions at run time 6 parse expressions are written in the parse dialect which like the do dialect is an expression oriented sublanguage of the data exchange dialect unlike the do dialect the parse dialect uses keywords representing operators and the most important nonterminals infix parsing operators don t have prefix equivalents and use precedence rules sequence has higher precedence than choice 6 actions can be included to be taken during the parsing process as well and the parse function can be used to process blocks or strings at the string parsing level parse must handle the low level parsing taking into account characters and delimiters block parsing is higher level handling the scanning at the level of rebol values 6 the parse dialect belongs to the family of grammars represented by the top down parsing language or the parsing expression grammar peg the main similarity is the presence of the sequence and choice operators all the family members have parse dialect syntax and the similarities between the parse dialect and the peg are illustrated by this transliteration of a peg example that parses an arithmetic expression digit charset 0 9 value some digit expr product value any value sum product any product expr sum parse all 12 13 expr implementations edit the official rebol 2 7 8 implementation is available in several editions core view command sdk and ios both core and view editions are freely redistributable software 1 the runtime environment is stored in a single executable file rebol core 2 7 8 the console edition is about 300 kb and rebol view 2 7 8 the graphical user interface edition is about 650 kb in size rebol view provides platform independent graphics and sound access and comes with its own windowing toolkit and extensible set of styles gui widgets extended editions such as rebol command 2 7 8 or rebol sdk 2 7 8 require a paid license they add features like odbc data access and the option to create standalone executable files citation needed legacy edit rebol was named by douglas crockford as one of the inspirations of javascript object notation 5 rebol inspired the open source orca project which is an interpreted rebol like language 14 boron is an interpreted homoiconic language inspired by and similar to rebol which is meant for embedding domain specific languages it is implemented as a c library licensed under the terms of the lgplv3 the red programming language was directly inspired by rebol yet the implementation choices of red were geared specifically to overcoming its perceived limitations 15 see also edit domain specific language language oriented programming references edit a b rebol technologies the rebol view and rebol core 2 7 8 license r3 source at github carl s rebol blog let s switch to reb suffix rebol com august 18 2013 retrieved january 23 2014 a b c d e f g goldman e blanton j 2000 rebol the official guide mcgraw hill osborne media isbn 0 07 212279 x a b c crockford douglas the json saga jsonsaga ppt archived october 4 2012 at the wayback machine a b c d e f g h i j k l roberts ralph 2000 rebol for dummies hungry minds isbn 0 7645 0745 1 a b auverlot olivier 2001 rebol programmation eyrolles isbn 2 212 11017 0 a b sassenrath carl july 1 2000 inside the rebol scripting language dr dobb s journal rebol to become open source rebol com september 25 2012 retrieved january 23 2014 sassenrath carl december 12 2012 comments on r3 source code released retrieved august 14 2014 you probably thought the source release would never happen am i right well it s there now in github at github com rebol rebol calling rebol rebol december 14 2012 archived from the original on december 3 2013 retrieved december 2 2013 sassenrath carl cross compiling rebol for your favorite embedded board retrieved september 16 2016 source code for the rebol interpreter rebol rebol github retrieved march 14 2017 the rebol orca project at freecode the red project at github further reading edit mikes nora november 20 1999 a rebol incursion it s not a scripting language not a programming language and not a new amiga either or is it linuxworld archived from the original on march 24 2005 story derrick august 27 1999 rebol might be the language for the rest of us web review archived from the original on october 12 1999 external links edit rebol at curlie a rebol tutorial rebol 3 tutorial v t e data exchange formats human readable formats atom csv edifact json web encryption web token web signature property list rdf rebol toml xml yaml binary formats amf asn 1 smi avro base32 base64 bson ubjson cap n proto cbor flatbuffers messagepack property list protocol buffers thrift cyphal dsdl xdr uuencode yenc comparison of data serialization formats authority control national libraries france data israel united states other sudoc france 1 retrieved from https en wikipedia org w index php title rebol oldid 1006163529 categories programming languages amigaos 4 software dynamic programming languages dynamically typed programming languages functional languages prototype based programming languages scripting languages extensible syntax programming languages formerly proprietary software programming languages created in 1997 high level programming languages homoiconic programming languages hidden categories webarchive template wayback links articles with short description short description matches wikidata use mdy dates from december 2014 all articles with unsourced statements articles with unsourced statements from september 2016 articles with curlie links articles with bnf identifiers articles with j9u identifiers articles with lccn identifiers articles with sudoc identifiers this page was last edited on 11 february 2021 at 1...