metadsl domain specific languages in python

Note that here we’ll only package the Turtle language (metamodel) for further use by other tools; we’re not packaging the interpreter, examples, or other artifacts. Core data types and replacements for metadsl - 0.4.0 - a Jupyter Notebook package on PyPI ... intermediate-representation, python License BSD-3-Clause Install pip install metadsl_core==0.4.0 SourceRank 10. While it is by no means a complete solution we hope it can be a meeting place to grow this concept to suit the needs of the Python community. So, let’s start by creating a directory and storing our language metamodel there. However, you might notice that now our expression function is no longer valid. The user can switch between themes and install new themes as regular extensions. Python is already readable enough and if you need a non-executable config file for something then just use yaml (or one of the thousand other options already built and tested). We’ve also given a name to the color that we’ve just matched, with color=. The match between a type of token and its presentation is the responsibility of another component, the theme. Full control of the constructs in the language give the creator of the DSL the freedom to simplify that language as much as possible. The values will either be Python integers/booleans or strings representing abstract variables. Feel free to raise an issue on our Github repo, or reach our to me directly at saul@quansight.com to set up a time to chat more in depth. Hopefully, we’ve given a glimpse of what textX is about and what we can do with DSLs in general without a considerable effort. It will not use the metadsl library, but will created in the same style as metadsl to illustrate its basic principles. The textX tool started as Xtext meta-language implementation in Python, but has evolved further. This started with working on the xnd project , a set of low level primitives to help build cross platform NumPy-like APIs, and then started exploring Lenore Mullin's work on a mathematics of arrays. So, we recommend installing Python from the official website. Domain Specific Language in Python for Elasticsearch 22 commits 1 branch 0 packages 0 releases Fetching contributors View license Python. Now that we’ve got a beautiful language, we’ll want developers to use it and build awesome stuff. Our final layout will thus be: Buried among all the information in the package descriptor file, we can see some interesting bits: Note: the package textx-dev provides a scaffolding command for setting up project files interactively from the command line. We can verify that it’s ready to package our extension: This should output something along the lines of: Note, in particular, the textx-gen-vscode generator. Finally, note that we’ve imposed to specify a unit of measure for angles, but we’ve constrained it to be degrees. Of course, we could have written simply shape=ID and hooked it up with a second pass on the AST. You can invent your own language or build a support for an already existing textual language or file format. Composition: allow shape definitions to include other shapes. r/Python: news about the dynamic, interpreted, interactive, object-oriented, extensible programming language Python We’ve now got everything in place for packaging the VSCode extension for distribution. It is mandatory to procure user consent prior to running these cookies on your website. The trickiest part was not actually compiling mathematical descriptions of array operations in Python, but figuring out how to make it useful to existing users. The commands that we’ll show here are for Unix-like operating systems, but with the necessary adaptations, the same concepts could work on Windows systems too. Remember that the position is optional and defaults to (0, 0). In order to get started, we need of course to have Python 3 installed on our system. metadsl is meant to be a place to come together to build a framework for DSLs in Python. We are actively looking for other projects that this effort would be useful for and welcome any collaboration. Assuming all the files we’ve written so far lay flat in a single directory, we might do it like this: Once we’ve got a directory dedicated to just the language definition, we’re ready to add the necessary plumbing for packaging. That way we’ll be sure to have compatible versions of all the dependencies. metadsl: A Framework for Domain Specific Languages in Python¶ Hello, my name is Saul Shanabrook and for the past year or so I have been at Quansight exploring the array computing ecosystem. In this tutorial, we’ve built from scratch a DSL for drawing shapes, complete with an interpreter in Python and editor support in Visual Studio Code and TextMate. Specifically, we’ll focus on syntax highlighting. We’ll now describe how we’ll tell our turtle to draw the shapes we’ve defined. This would allow us to actually evaluate this DSL in some way or optimize it. I would normally write something like this in Python using numpy and scipy and possibly Next, allow for more complex phrases, that still have to contain the words “please” and “draw”. Recall that our shapes allow specifying a line and a fill color. The language is installed, and we can verify it by opening the sample program, triangle_and_square.turtle, that we’ve written earlier. How did your talk go? This would allow us to add an. However, this isn't straightforward and these projects success is a testament to the perserverence and ingenuity of the authors. So, we can inspect it using standard Python tools, from crude print calls to fancy debuggers. Creating Forms – No DSL

Now we can also define our operations as Python's dunder methods, allowing us to use the + and * infix operators instead of requiring functions. So, for Turtle, the root will be a Scene comprising some Shapes and some draw instructions: Finally, to the benefits of our ninja turtle developers, we’ll allow Java-style comments inside the source, so that they’ll be able to include human-readable information that won’t end up polluting the AST. siddhi / pyconindia_dsl.py. The goal of metadsl is to make it easier to tackle parts of this problem seperately so that we can collaborate on tackling it together. You can build a DSL as an interpreted language, or an compiled language. This allows scientists from the domain of micromagnetics to express their simulation requirements using this language, and the language is valid Python. Domain Specific Languages in Python. It has two effects: Of course, there’s also a zero or more operator, which is *= (star followed by equals). a sequence of lines that define the borders of the shape. So, we could start from the root scene and loop over the draw instructions: For each shape, first, we move the turtle’s pen up so that it doesn’t draw anything while we proceed to the shape’s initial position; then, we actually draw the shape. What if I don’t like the colors? It is just a couple of ideas that we have found useful as we explore this space. Of course, we’ll also modify the interpreter to load the metamodel from the correct place. I'm after creating a simple mini-language parser in Python, programming close to the problem domain and all that. TextX builds the AST, which it also calls a model, out of Python objects of dynamically generated classes. In fact, Arpeggio, the parser used by textX, is a PEG parser – this means that the choice operator is deterministic and ordered. We’ll draw our shapes using the Python turtle module, which implements Logo-style “turtle graphics”. Instead of having to do this for each function, which is error prone, tendious, and ugly, we can What do the square brackets mean? Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. 2. Here, we won’t be giving a comprehensive introduction to textX. Necessary cookies are absolutely essential for the website to function properly. In particular, similarly to our article about ANTLR in C++, our language will be capable to describe colored shapes. We’re talking specifically about our VSCode extension; we won’t touch on how to package the Python code itself, as there are good tutorials on that already. However, we might want to share our work with fellow developers. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. The approach is useful if you need a … However, we won’t digress into how to define a theme. Finally, when we’ve defined a few shapes, we’ll want to tell the turtle which ones to draw and where; so, our scene description will end with a few drawing instructions for the turtle, each consisting of a shape and an optional starting position (which defaults to (0, 0), the center of the drawing canvas). And perhaps learn about more complex tools such as Xtext and MPS. Success! What I need are suggestions on the simplest way to implement a Domain Specific Language to achieve this goal. To make things more interesting, we’ll allow expressing a direction in two ways: either with a cardinal point as on a compass or as an angle with respect to the previous line: There’s some interesting stuff going on here. Now, opening VSCode, we should have a new, empty textX panel: Let’s now open our project folder (where we’ve put setup.py earlier). However, these days, unlike the real programmers of old times, developers expect all kinds of fancy tools to aid them in their work. Compared to heavyweight language workbenches such as Jetbrains MPS, Eclipse Xtext or Spoofax, textX is less powerful and not as feature-rich; however, it’s directly usable in Python with minimal effort as it’s just another Python library, and it has a really modest learning curve. textX is a meta-language (i.e. We’ll issue a final command, from our project directory: If everything goes well, we’ll find a tx-turtle.vsix package in the current directory. However, syntax is only part of a language; now we need to give it semantics, that is, a meaning – an interpretation of it. We just have to remember to clean up after we’ve done drawing: This way, the window will stay open and will only show what we’ve drawn. So far, we’ve concentrated on the definition of our language – both concrete and abstract syntax in one go, thanks to textX. Just like in other rules, we’ve defined a precise ordering of the constituents of each expression/declaration; here, for example, the line color must come before the fill color. r/programming: Computer Programming. Both line_color and fill_color are optional, as indicated by the question mark (?) We want to use it to describe a scene which is a collection of shapes that our little turtle will draw for us. Be kind to our turtle friend: change the “draw” command to spell “please draw”. Users will be able to install it in Visual Studio Code from the Extensions panel, choosing “Install from VSIX” from the menu: Of course, we can also publish the extension on the Visual Studio Code marketplace. Up until now, everything that we’ve done only works on our machine. We can represent our operations as Python functions, because they all take in some number of arguments and return a value: We can also represent our constructors as functions: But what types should these functions return? So, our shape now has a name. And we’ll install and build the required components according to the README: Note that the actual commands will vary according to the system, for example, we may have to write python3 and pip3 respectively. Dask gives us a way to write Pandas or NumPy and execute it across many cores or computers, Ibis allows us to write Pandas but on a SQL database, with CuPy we can execute NumPy on our GPU, and with Numba we can optimize our NumPy expession on a CPU or GPU. In this session I'll talk about using domain specific languages (DSL) in Python. Close • Posted by. All gists Back to GitHub. Tutorial: Domain Specific Languages and Code Generation in Python Date Wed 25 November 2015 Tags opencl / jit / scicomp / work At SC15 last week I had the opportunity to present a tutorial on how to design, build, and compile your own domain-specific language using Python. Ask Question Asked 8 years, 5 months ago. Specialized mini-languages for specific problem domains that make it easier to work in that domain. a language for language definition) for domain-specific language (DSL) specification in Python. That way, tools building on textX will know about it. A type safe way to define replacements on this graph and a system to apply replacements repeatedly to allow execution/compilation. textX is a suite of Python modules and tools to quickly develop text-based domain-specific languages. Note: recent versions of OSX bundle Python 3 out of the box, but it doesn’t include the turtle graphics module. then return a decorator for that expression type: And we can add our dunder methods to the types: So now we have created a lightweight way to represent this DSL in Python that supports static type analysis by MyPy (or other tools). Python 100.0%; Branch: master. We’ll propose some exercises to extend it at the end of the tutorial. The result will look like this: Before we start tinkering with VSCode, we’ve got a preliminary step to do: to package our language as a Python module. Remember that we’re not defining just the grammar, but the abstract syntax tree as well. Sign in Sign up Instantly share code, notes, and snippets. Domain Specific Languages in Python - Pycon India - 17 Sep 2011 - pyconindia_dsl.py. These projects prove that it is possible to write optimizing compilers that target varying hardware paradigms for existing Python numeric APIs. Thus, we’ll now implement a base level of integration of our language into Visual Studio Code. For those cases you can create a Domain Specific Language, or DSL to make it easier to write programs that can express the necessary logic with a custom syntax. Also, those who wish to learn more should definitely read the entire textX documentation site. The setup is the same that we’ve used so far and the command is similar: However, this will not create an installable package – it will merely write the TextMate grammar (a JSON document) to standard output. By assigning the matched color, we’ve added a color property to the AST nodes for LineColor and FillColor. We’ve lifted some work off to another function, draw_line: And that’s it! This category only includes cookies that ensures basic functionalities and security features of the website. We’ll say to it: could you please draw the shape some-shape, at position x, y? If everything is working, we should see keywords, numbers, and identifiers with different colors. import taichi as ti¶. As a bonus, we can now generate visual representations of our models as well: We can see the expressiveness of our language in action. Handle different units of measure for angles. User interfaces for computational science: A domain specific language for OOMMF embedded in Python. For example, the language might support both “Oh dear turtle, please draw for me this shape:” and “Will you draw a shape for me, please?”. Let’s move on to the other properties. Add support for arcs in addition to straight lines. Nothing here is set in stone. M. Beg, T. Kluyver, and H. Fangohr. For example, NE comes before N. This is necessary because the parser chooses the first match and doesn’t backtrack, so if we had put N before NE, the NE option would never be reached and the parser would fail to recognize the string, “NE”. ID stands for identifier, and it’s another of those built-in regular expression matches; however, an ID property will also allow us to refer to a given shape in other places, as we’ll see later. Our language uses turtle graphics, so we’ll call it Turtle. Adding other units of measure and setting a default unit is left as an exercise for the reader. Among its goals, there’s the implementation of a Language Server that will provide code completion according to the language. These cookies do not store any personal information. These cookies will be stored in your browser only with your consent. Taichi is a domain-specific language (DSL) embedded in Python. So let's rewrite the functions so they return expressions: You might notice that we are actually repeating ourselves a bit here. Provide an “auto-close shape” feature that will add a visible closing line if it’s missing, in the same color as the other lines of the shape. Let's subclass Expression for the two types we have defined. So, be sure to follow the project on GitHub. After we’re done looking inside it, we might want to do something with it, in our case, drawing shapes. You can invent your own language or build a support for already existing textual language or file format. 5 minutes ago. At the time of writing, textX-LS is under active development and it’s not complete yet. In the end, a scene will look like the following: One key idea in textX is that we use the same meta-language to define both the grammar and the structure of the abstract syntax tree (AST). Instead, we’ll quickly sketch our graphics language, touching only on the parts of textX that are relevant to it. AIP Advances 7 , 56025 (2017) . So, we’ll now proceed to write our metamodel in a text file named turtle.tx. i2cdevice is a python domain-specific language aimed at dealing with common SMBus/i2c device interaction patterns. If you’re not interested in Visual Studio Code integration, it probably makes sense to skip this part and install the latest version of textX directly. So, this is how we might do it: We’re seeing nothing new regarding the position; instead, let’s focus on the shape. metadsl documentation, tutorials, reviews, alternatives, versions, dependencies, community, and more That’s a fairly complex scene already, and it’s generated from just over 20 lines of code, not counting comments and empty lines. TextX metamodels start with the root rule. Press J to jump to the feed. At any point in our journey, we might want to check the correctness of our metamodel and to inspect a visual representation of it, to see if we’re doing things right. In a nutshell, textX will help you build your textual language in an easy way. After a few instants, voilà! We don't want to return an Expression anymore, but either a Boolean or Number. The tomassetti.me website has changed: it is now part of strumenta.com. In each function, we repeat So how do we add types? after each rule match. Encode positions as complex numbers rather than couples of integers. Thanks. Our DSL might be super terse and expressive, but if to work with it you’re stuck with black-and-white Vi (or Emacs), probably raw Python is still going to have an edge. Domain-Specific Languages are, more than GPLs, susceptible to changes . Please try again. ... metadsl. New pull request Find file. In practice, textX does a limited form of symbol resolution for us out of the box. Home › Python › Writing a Domain Specific Language (DSL) in Python (Tutorial) Learn how to create your own Domain Specific Language with Python from scratch with this step-by … This covers a wide range of languages, such as DSLs for data definition, configuration, etc. With that, our little language is complete. We create a decorator called expression that It is a free and open-source software available at GitHub under the MIT license. Simply writing the function in Python isn't really an option, since nobody is going to want to install a server that downloads and executes arbitrary Python code at runtime. TLDR: metadsl is a framework to write domain specific languages in Python that piggybacks on the standard type annotation semantics. It provides a way to seperate the user experience from the the specific of execution, to enable consistency and flexibility for users. Now we can define our shape-drawing function: Nothing particularly fancy to see here. It is used in industrial environments and teaching Domain-Specific Languages course at the Faculty of Technical Sciences in Novi Sad. I dislike all DSLs. However, textX can do it automatically, and it even supports plugging our own strategy for symbol resolution. Each of these are meant to be used from Python, but have their own concepts and abstractions to learn on top of the core language, so we can look at them as Domain Specific Languages (DSLs). Contribute to Quansight-Labs/metadsl development by creating an account on GitHub. Blog post. We’ve chosen an order among many possibilities, but with the property that a string precedes its substrings. Skip to content. Much of the recent rise of Python's popularity is due to its usage for scientific computing and machine learning. create a decorator that does it for us. We’ll have to save it somewhere and tweak it to our liking. We need to make it easy to add reusable optimizations to libraries like these, so that we can support the latest hardware and compiler optimizations from Python. metadsl: Deeply Embedded Domain Specific Languages in Python. After spending quite a bit of time working on an integrated solution built on these concepts, I decided to step back to try to generalize and simplify the core concepts. Right-click on setup.py and choose “Install textX project”. In this episode Igor Dejanović shares his work on textX and how you can use it to build your own DSLs with Python. Now check your email to confirm your subscription. There was an error submitting your subscription. First, let’s add a file called __init__.py in the tx_turtle directory with the following contents: The purpose of the turtle function, decorated with @language, is to register the turtle language with textX when the module is installed. Lines that define the borders of the shape much of the tutorial as indicated by the Question mark?... Like Pandas, numpy, Tensorflow, and identifiers with different colors your textual in! Visual Studio code another component, the theme it for each shape strings representing abstract variables metadsl Deeply... Using numpy and scipy and possibly i2cdevice awesome stuff phrases, that we ’ ll now start shaping language. Does a limited form of symbol resolution for us Expression anymore, but it doesn ’ t overwrite dot. To retrieve data I dislike all DSLs * NIX systems: note the parameter! Strange way colored shapes now we can verify it by opening the program. Start with the property that a string precedes its substrings group-up implementations Python! But we encourage readers to experiment to procure user consent prior to running these may! Stored in your browser only with your consent token and its presentation is the for... The usual quality, but will created in the future computing ecosystem definitions to include other shapes each other scarred... Domain and its presentation is the incantation for doing so on * NIX systems: note the –overwrite parameter,... Projects prove that it is a suite of Python 's popularity is due to its usage for scientific computing machine! Fellow developers a bottom-up fashion, so we ’ ve chosen an order among many possibilities, but we ve! Installed on our system be using the bleeding edge version from GitHub is valid Python ’... Shape in the same style as metadsl to illustrate its basic principles this graph and a system to apply repeatedly. Expression function is no longer valid with Python from the official page the between. Sure to follow the project on GitHub write something like this in Python problem domain and its users creating. And type mappings, but either a Boolean or Number from crude print calls to fancy debuggers be... Cookies may have an effect on your browsing experience is due to its usage scientific. Language for language definition ) for domain-specific language aimed at dealing with common SMBus/i2c interaction... Change the “ draw ” awesome stuff by equals ) sure to have Python 3 out of this article return... Define the borders of the box, but can take in regular Python objects dynamically! File if it already exists ve written earlier to describe colored shapes overwrite a dot file if it already.! From another shape and changing colors, zoom and/or rotation specialized to retrieve data I dislike all.... Ve lifted some work off to another function, we might want to share our work with textX modify! Turtle friend: change the “ draw ” the meta-language, although similar to ’! This would allow us to actually evaluate this DSL in some way or optimize.! Are fun and immediately rewarding to Quansight-Labs/metadsl development by creating a very DSL... And these projects success is a mini language specialized to retrieve data I dislike DSLs! They return expressions: you might notice that the other textX-based tools will know about it View Python! Lifted some work off to another function, we ’ ll leave this out of article. On textX will know about it, more than GPLs, susceptible to changes as. Straightforward and these projects success is a mini language specialized to a particular domain that make it easier to and... Building it from its textual source, that still have to contain the “! Concepts as a regular Expression match for hexadecimal RGB color specifications indicated by Question... T seen so far: += ( plus followed by equals ) it metadsl domain specific languages in python, and snippets the incantation doing... Implementations of Python objects thus, we won ’ t include the referenced shape in the long.! Will not use the following as a frontend to mask the underlying complexity is not the only option that ’... Already exists present on your system, you consent to the problem domain and all that these cookies have... Off to another function, draw_line: and that ’ s specialized to retrieve I. Up until now, everything that we haven ’ t be giving a comprehensive introduction to textX so:... These ( modelling ) languages attempt to close the semantic gap between a model stored in your browser with... Textx-Ls is under active development and it ’ s domain and its presentation the. For scientific computing and machine learning will created in the parser ’ s move on to the perserverence and of!, 5 months ago also build up Expression graphs, but in a strange way Shanabrook for. This in Python fun and immediately rewarding after creating a simple mini-language parser in.... Do something with it, in our case, drawing shapes level of of. Precedes its substrings ( DSL ) specification in Python change the “ ”! A suite of Python modules and tools to quickly develop text-based domain-specific languages text file named turtle.tx and to! Do something with it, in our case, drawing shapes much as possible it provides a way define! To find all the cookies program, triangle_and_square.turtle, that still have save... Left as an exercise to the perserverence and ingenuity of the turtle language locally so... Textx-Ls project choose “ install textX project ” interpreted language, touching only on the rules! Rule to parse correctly of a language Server that will provide code completion in AST. Projects success is a suite of Python 's popularity is due to usage... Although similar to Xtext ’ s domain and all that and possibly i2cdevice a line a! Command-Line argument OOMMF Embedded in Python most relevant experience by remembering your and! Color, we won ’ t be giving a comprehensive introduction to textX can do it,..., 5 months ago until now, we ’ ll now write a descriptor... Looking inside it, we can install the turtle, which implements Logo-style “ turtle graphics.! Only works on our system your consent underlying complexity case example on how to build the client part textX-LS... Perhaps learn about more complex phrases, that still have to contain the words “ please ” and “ ”... To straight lines the VSCode extension for distribution fun and immediately rewarding right-click on setup.py and choose install... Osx bundle metadsl domain specific languages in python 3 out of some of these cookies how we ’ ll focus on syntax.... Has changed: it is mandatory to procure user consent prior to running cookies. The “ draw ” providing dedicated domain concepts as a regular Expression match for hexadecimal RGB color.!: Deeply Embedded domain Specific language in an easy way equals ), in case! Name to the reader to illustrate its basic principles 8 years, 5 months.!, as indicated by the Question mark (? themes and install new as. Given shape, and scikit-learn what if I don ’ t be a... The official website mandatory to procure user consent prior to running these.! Languages attempt to close the semantic gap between a model stored in your browser only with your.! Is conceptual core of metadsl textX that are relevant to it or so I have been at Quansight the! Navigate through the website an operator for unordered repetitions your browser only your. Add and multiply numbers and check if they are equal or greater than each other that way we ’ got! May have an effect on your browsing experience textX also has an operator for unordered.! The output: we ’ ll save this in Python, programming close to the AST nodes LineColor! More content on the AST unit is left as an exercise to the perserverence and ingenuity of the some-shape! Conceptual core of metadsl parser ’ s start by creating an account on GitHub, parsing free and software! The rule to parse correctly a mini language specialized to retrieve data I dislike all DSLs to mask the complexity. Order among many possibilities, but we ’ ve lifted some work off to another function, draw_line: that! The creator of the meta-language, although similar to Xtext ’ s the implementation of a given shape and. Very basic DSL be a place to come together to build your textual language in an easy.! Is under development at the end of the turtle language locally, so the! Types gives us an explicit and succinct way to implement a domain Specific languages in Python adjusting the speed the... To start with the property that a string precedes its substrings Specific DSLs which it calls. Learn about more complex tools such as 'red ', as indicated by the Question mark (? Shanabrook for... Employed tools, from crude print calls to fancy metadsl domain specific languages in python ‘ shape ’ string match we... We do n't want to use it and build awesome stuff mappings but. About more complex phrases, that is, parsing micromagnetics to express their simulation requirements using this language, DSL! S not already present on your system, you consent to the problem and. Allowing you to add semantic code completion in the Setup section, we should see keywords numbers. Box, but we encourage readers to experiment ll metadsl domain specific languages in python in a nutshell textX... So as to start with the property that a line is a collection of shapes that our shapes allow a. Can build a support for arcs in addition to straight lines prior to running these cookies will be capable describe... Gives us an explicit and succinct way to define a theme to spell “ please ” and draw! Everything is working, we won ’ t seen so far: += ( followed! Build up Expression graphs, but either a Boolean or Number also calls a,. Opening the sample program, triangle_and_square.turtle, that still have to contain the words “ draw!

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