PureScript 0.7.0 "MELTDOWN" 发布

发布于 2015-06-30 10:24:36 | 87 次阅读 | 评论: 0 | 来源: 网友投递

PureScript 是个小巧而强大的静态类型语言，可以编译成 JavaScript。purescript 主要是由 Haskell 和 PureScript 编写的。

PureScript 0.7.0 ("MELTDOWN") 发布，主要是按照计划进行改进，在 1.0 之前简化升级路径。此最新的核心库已经更新编译到这个版本。旧版本的核心库已经不适用于这个版本，而且最新的库也不能使用旧的编译版本构建。

详细升级和迁移指导请看 wiki。

psc 可执行已经使用 psc-make 替代，重命名为 psc (为了遵循 CommonJS 模块输出标准)
Int 和 Number 常量
Prelude 模块不再自动导入，必须以跟其他模块一样的方式导入
编译器不再包括模块，模块已经拆分到以下这些库：
数组类型的 [] 语法已经被移除，但是还是可以使用 [] 数组常量
- [] should now be written as Array, and [a] as Array a.
Cons patterns for arrays have been removed.
Declaring operators in classes will now produce a warning. Changes will be coming to operators in PureScript 0.8, and moving to named members in classes with operators as aliases (e.g. (<$>) = map) should make the transition easier in the future.
JavaScript for the FFI can no longer be provided inline.
- Values must instead be provided in a separate .js file, and passed to the compiler with the -ffi flag.
- Values should be provided in the form exports.foo = ..., similar to a CommonJS module
- The file should have a comment // module X.Y.Z where X.Y.Z is the name of the module the JS values are for.
- See here for an example

Module exports (@andyarvanitis). Currently, only full module exports are supported, but imported modules can be re-exported using the following syntax:purescript module M1 (module M2) where import M2
Documentation improvements (@hdgarrood):
- psc-docs can now generate multiple output files, allowing documentation to be collected into functional groups.
- A new tool psc-publish has been added, which generates module documentation in a JSON format required by Pursuit 2 (coming soon)
@puffnfresh has worked on dramatically increasing the performance of incremental builds, with improvements up to 10x compared to the previous release.
The new --require-path option allows the syntax of module imports in generated CommonJS modules to be customized (@garyb).
@etrepum has added support for building with Stack.
PSCi now supports computations in the Eff monad. (@paf31)
The compiler now emits warnings in the following cases:
- Operator name used in type class definition (@garyb)
- Type wildcard used (@nicodelpiano)
- Shadowed variable name (@paf31)
@balajirrao has improved the appearance of unknown and rigid types appearing in error messages.
@puffnfresh has added position information to pattern match errors.
@puffnfresh has added some new optimizations (inlining <<< and $)

psc, psc-docs and psc-bundle now support file globs as command-line arguments, fixing a bug related to the command length on Windows machines (@paf31)
@wuzzeb has fixed some issues in the pretty printer.
@mjgpy3 has improved error messages related to incorrect pattern matches on data constructors.

Pulp has been updated:
- The new psc and psc-bundle binaries are supported
- FFI modules are now identified and compiled based on a convention
- pulp docs now generates individual Markdown files for each source module
gulp-purescript has been updated:
- The new psc and psc-bundle binaries are supported
- FFI modules are now supported

The following libraries have been moved into the core library set:
- purescript-lists - Strict and lazy linked list data structures
- purescript-assert - Low level assertion library for tests
- purescript-parallel - An applicative functor for parallel composition of asynchronous computations.
- purescript-arrows - Arrow type classes and standard instances.
- purescript-tailrec - A type class for stack-safe monadic tail recursion.
The requirements for libraries in the purescript-contrib organization have been tightened, to try to ensure that libraries stay maintained.