pep508

lib.pep508.parseMarkers

Type: parseMarkers :: string -> AttrSet

Parse PEP 508 markers into an AST.

input

: Function argument

::: {.example #function-library-example-lib.pep508.parseMarkers}

lib.pep508.parseMarkers usage example

# parseMarkers "(os_name=='a' or os_name=='b') and os_name=='c'"
{
  lhs = {
    lhs = {
      lhs = {
        type = "variable";
        value = "os_name";
      };
      op = "==";
      rhs = {
        type = "string";
        value = "a";
      };
      type = "compare";
    };
    op = "or";
    rhs = {
      lhs = {
        type = "variable";
        value = "os_name";
      };
      op = "==";
      rhs = {
        type = "string";
        value = "b";
      };
      type = "compare";
    };
    type = "boolOp";
  };
  op = "and";
  rhs = {
    lhs = {
      type = "variable";
      value = "os_name";
    };
    op = "==";
    rhs = {
      type = "string";
      value = "c";
    };
    type = "compare";
  };
  type = "boolOp";
}

:::

lib.pep508.parseString

Type: parseString :: string -> AttrSet

Parse a PEP-508 dependency string.

input

: Function argument

::: {.example #function-library-example-lib.pep508.parseString}

lib.pep508.parseString usage example

# parseString "cachecontrol[filecache]>=0.13.0"
{
  conditions = [
    {
      op = ">=";
      version = {
        dev = null;
        epoch = 0;
        local = null;
        post = null;
        pre = null;
        release = [ 0 13 0 ];
      };
    }
  ];
  markers = null;
  name = "cachecontrol";
  extras = [ "filecache" ];
  url = null;
}

:::

lib.pep508.mkEnviron

Type: mkEnviron :: derivation -> AttrSet

Create an attrset of platform variables. As described in https://peps.python.org/pep-0508/#environment-markers.

python

: Function argument

::: {.example #function-library-example-lib.pep508.mkEnviron}

lib.pep508.mkEnviron usage example

# mkEnviron pkgs.python3
{
  implementation_name = {
    type = "string";
    value = "cpython";
  };
  implementation_version = {
    type = "version";
    value = {
      dev = null;
      epoch = 0;
      local = null;
      post = null;
      pre = null;
      release = [ 3 10 12 ];
    };
  };
  os_name = {
    type = "string";
    value = "posix";
  };
  platform_machine = {
    type = "string";
    value = "x86_64";
  };
  platform_python_implementation = {
    type = "string";
    value = "CPython";
  };
  # platform_release maps to platform.release() which returns
  # the running kernel version on Linux.
  # Because this field is not reproducible it's left empty.
  platform_release = {
    type = "string";
    value = "";
  };
  platform_system = {
    type = "string";
    value = "Linux";
  };
  # platform_version maps to platform.version() which also returns
  # the running kernel version on Linux.
  # Because this field is not reproducible it's left empty.
  platform_version = {
    type = "version";
    value = {
      dev = null;
      epoch = 0;
      local = null;
      post = null;
      pre = null;
      release = [ ];
    };
  };
  python_full_version = {
    type = "version";
    value = {
      dev = null;
      epoch = 0;
      local = null;
      post = null;
      pre = null;
      release = [ 3 10 12 ];
    };
  };
  python_version = {
    type = "version";
    value = {
      dev = null;
      epoch = 0;
      local = null;
      post = null;
      pre = null;
      release = [ 3 10 ];
    };
  };
  sys_platform = {
    type = "string";
    value = "linux";
  };
}

:::

lib.pep508.evalMarkers

Type: evalMarkers :: AttrSet -> AttrSet -> bool

Evaluate an environment as returned by mkEnviron against markers as returend by parseMarkers.

environ

: Function argument

value

: Function argument

::: {.example #function-library-example-lib.pep508.evalMarkers}

lib.pep508.evalMarkers usage example

# evalMarkers (mkEnviron pkgs.python3) (parseMarkers "python_version < \"3.11\"")
true

:::