spec is not for text parsing - there are plenty of more suitable tools for that. It is not a general-purpose regex tool either.
> On May 28, 2016, at 5:46 PM, Georgi Danov <georgi.da...@gmail.com> wrote: > > I love the regexp approach, so decided to implement JSON parser in order to > get acquainted with spec. The parser treats the input as char sequence. > > The parser works, code is very readable, however performance is horrible — > json file with 3.5k characters takes 350 seconds to process — 10 terms/sec. > > Here is the spec > https://gist.github.com/gdanov/3a0440255f7f4df262ce16ce87351a04 > > On Monday, May 23, 2016 at 4:12:29 PM UTC+2, Rich Hickey wrote: > Introducing clojure.spec > > I'm happy to introduce today clojure.spec, a new core library and support for > data and function specifications in Clojure. > > Better communication > > Clojure is a dynamic language, and thus far we have relied on documentation > or external libraries to explain the use and behavior of functions and > libraries. But documentation is difficult to produce, is frequently not > maintained, cannot be automatically checked and varies greatly in quality. > Specs are expressive and precise. Including spec in Clojure creates a lingua > franca with which we can state how our programs work and how to use them. > > More leverage and power > > A key advantage of specifications over documentation is the leverage they > provide. In particular, specs can be utilized by programs in ways that docs > cannot. Defining specs takes effort, and spec aims to maximize the return you > get from making that effort. spec gives you tools for leveraging specs in > documentation, validation, error reporting, destructuring, instrumentation, > test-data generation and generative testing. > > Improved developer experience > > Error messages from macros are a perennial challenge for new (and > experienced) users of Clojure. specs can be used to conform data in macros > instead of using a custom parser. And Clojure's macro expansion will > automatically use specs, when present, to explain errors to users. This > should result in a greatly improved experience for users when errors occur. > > More robust software > > Clojure has always been about simplifying the development of robust software. > In all languages, dynamic or not, tests are essential to quality - too many > critical properties are not captured by common type systems. spec has been > designed from the ground up to directly support generative testing via > test.check https://github.com/clojure/test.check. When you use spec you get > generative tests for free. > > Taken together, I think the features of spec demonstrate the ongoing > advantages of a powerful dynamic language like Clojure for building robust > software - superior expressivity, instrumentation-enhanced REPL-driven > development, sophisticated testing and more flexible systems. I encourage you > to read the spec rationale and overview http://clojure.org/about/spec. Look > for spec's inclusion in the next alpha release of Clojure, within a day or > so. > > Note that spec is still alpha, and some details are likely to change. > Feedback welcome. > > I hope you find spec useful and powerful! > > Rich > > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with your > first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
