使用Alex/对Cabal感到高兴

Question

我正在为要参加的课程编写编译器。该类不是专门的Haskell，但我正在使用Haskell来编写我的编译器和解释器。我有一个Cabal套件设置，希望可以使我的教授轻松运行/编译。我在Build-Tools字段中对两个可执行文件都有快乐和Alex，但Cabal忽略了这一点，然后抱怨它找不到Happy和Alex应该生成的模块。如果我手动运行：

alex LimpScanner.x
happy LimpParser.y

然后阴谋集团完美地运行。

我以为我让Cabal自动运行它们，但也许我记得不完美。

Limp.Cabal：

-- limp.cabal auto-generated by cabal init. For additional options,
-- see
-- http://www.haskell.org/cabal/release/cabal-latest/doc/users-guide/authors.html#pkg-descr.
-- The name of the package.
Name:                limp

-- The package version. See the Haskell package versioning policy
-- (http://www.haskell.org/haskellwiki/Package_versioning_policy) for
-- standards guiding when and how versions should be incremented.
Version:             0.1

-- A short (one-line) description of the package.
Synopsis:            LIMP Compiler (Compiler Construction course project)

-- A longer description of the package.
-- Description:         

-- URL for the project homepage or repository.
Homepage:            http://www.cs.rit.edu/~eca7215/limp/

-- The license under which the package is released.
License:             AllRightsReserved

-- The file containing the license text.
License-file:        LICENSE

-- The package author(s).
Author:              Edward Amsden

-- An email address to which users can send suggestions, bug reports,
-- and patches.
Maintainer:          eca7215@cs.rit.edu

-- A copyright notice.
-- Copyright:           

Category:            Language

Build-type:          Simple

-- Extra files to be distributed with the package, such as examples or
-- a README.
-- Extra-source-files:  

-- Constraint on the version of Cabal needed to build this package.
Cabal-version:       >=1.2


Executable limp
  -- .hs or .lhs file containing the Main module.
  Main-is: Limp.hs

  hs-source-dirs: src     

  -- Packages needed in order to build this package.
  Build-depends: base, array, haskell98     

  -- Modules not exported by this package.
  -- Other-modules:       

  -- Extra tools (e.g. alex, hsc2hs, ...) needed to build the source.
  Build-tools:         alex, happy
Executable limpi
  Main-is: LimpInterpreter.hs
  hs-source-dirs: src
  Build-depends: base, array, haskell98
  Build-tools: alex, happy

目录布局：

limp/
├── Setup.hs
├── limp.cabal
└── src/
    ├── Limp.hs
    ├── LimpInterpreter.hs
    ├── LimpParser.ly
    ├── LimpScanner.x
    └── LimpToken.hs

Answer 1

显然，我缺少的实际上是其他模型：字段。一旦添加了这一点，Cabal愉快地（Pardon the Pun）建造了我的口译员。

Answer 2

对于沃伦·哈里斯（Warren Harris）和其他像他（和我本人）的其他人可能会出现的情况，需要将其他模块设置为一个模块名称列表（我猜？），这些模块名称将被建筑工具中列出的工具构建。

因此，就我而言，我的.cabal文件的相关部分最终看起来像这样：

build-tools:         alex, happy
other-modules:       Language.Heidi.Parser,
                     Language.Heidi.Lexer