Domain specific languages martin fowler rebecca pdf

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Some languages with very flexible syntax like TCL and Lisp build their DSL directly into the language. ), and document languages like LaTex, HTML or CSS. ), shell scripts, especially including stuff like twill, a command driven web browser (mostly used for automated test), data storage and exchange languages (XML, YAML. ), all template languages (Django, Smarty.

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The real programming language parses the DSL code and does something with it, typically, the DSL code only focuses on the what you want to do, and the larger system figures out the how.Д®xamples of DSL include all query languages (SQL, XPath. You can think of DSLs as overly complex arguments for functions written in a more general programming language. I did not invented a new Language rather then I just created bunch of Strings that micro controller could read from EEPROM and could parse accordingly and could perform a specific task. So I wrote some instructions and told the user to program that board according to these instructions.

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I onces created a Switch board for user which could be operated via Serial port of a computer and User want a program for that board which could be executed on that board and Relay switches will be turned on and off accordingly. But if you wrote instruction in such terms which many people could understand and could follow then this is not DSL. You can say if you wrote instructions to a paper which only some person or your only best friend can understand and no one else could. I will try to explain this in much simpler way as some one like me come will understand.ДЄs general purpose languages are used for vast purposes the DSL is only made for specific domain. Well! there is lot of things explained above. HEADER contains a Title Bar caption 'Hello World' with login to Collins SoftwareДЄ Menu DSL don't fit the page layout DSL, so I built a unique DSL for menus.Д®ach problem is unique, the computer can use any format, it is the human that DSLs are designed for, so make it understandable by humans, something they can type in, and make the language out of real words for it is real people, places, and things that we are describing.

Each of these Cells could then be split into Rows and Columns to any depth.

#Domain specific languages martin fowler rebecca pdf generator#

I could then tell the page generator to add a TITLE BAR, STATUS BAR, MENUS, TABLE, FORMS., to specific cells.

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I defined 6 regions on the page, HEADER, BODY, FOOTER, LEFT/RIGHT MARGINS, and LEFT/RIGHT FULL MARGINS. I found that HTML did not really solve the problem of page layout, so I got rid of it and defined a DSL that does fit.

We use EXCEL a lot for DSL, it works great for describing small problems, under 65K to 1M rows, such as a tree structures or menus, column A is the level, other columns are icons, colors, labels and such (EXCEL is an editable CSV). JSON does not fit the ease of use portion, it is overkill that adds unnecessary complications were CSV works for most problem. CSV is very useful, it fits most problems. I would stay away from using other solutions that might be convenient but do not fit the problem such as HTML that was used to define Data (XML). Parsing is so fast that any syntax you use is fine, I prefer natural language as my syntax in most cases, 'Pay Employees at the first of the month', but domain specific is just that, domain specific, you determine the syntax that best fits the problem.

Remember that speed and ease of use are the primary design criteria. To build a DSL determine the minimum number of characters needed to describe a process that you can remember and does not require documentation. 'Zip all html files in my web site' requires 300 lines of 3 or 4 different Languages to complete. Unfortunately there is a lack of domain specific languages to describe even our most basic processes, so we use the few languages we do have to describe everything we do. PDF: describe text/image placement on paperДЄny language that we use to describe a specific process is a DSL. Compilers: Assignment Statements - A = A + 1, Conditionals - IF (TRUE).