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Author SHA1 Message Date
Eelco Dolstra d315210612 * Added a builtin function `isList' to test whether a value is a list. 
With this primitive, a list-flattening function can be implemented
  (NIX-55, example is in tests/lang/eval-okay-flatten.nix).
 2006-09-22 14:55:19 +00:00
Eelco Dolstra c02a44183f * Builtin functions head' and tail' to return the head and tail of 
list.  Useful for lots of things, such as implementing a fold
  function (see NIX-30, example is in tests/lang/eval-okay-list.nix).
 2006-09-22 14:46:36 +00:00
Eelco Dolstra 8a1ab709a4 * New builtin functions builtins.{hasAttr, getAttr} to check for 
attribute existence and to return an attribute from an attribute
  set, respectively.  Example: `hasAttr "foo" {foo = 1;}'.  They
  differ from the `?' and `.' operators in that the attribute name is
  an arbitrary expression.  (NIX-61)
 2006-09-22 14:31:55 +00:00
Eelco Dolstra de90fdf908 * Allow "$" in strings as long as they are not followed by "{". (Too 
bad flex doesn't have lexical restrictions, the current solution
  isn't quite right...)
 2006-09-01 12:04:06 +00:00
Eelco Dolstra f93f7b75be * Okay, that's a bit harder than expected. 2006-08-30 13:10:04 +00:00
Eelco Dolstra dce1afdc67 * TDD: == should do a deep equality test, i.e., it should strictly 
evaluate its arguments.
 2006-08-30 12:25:27 +00:00
Eelco Dolstra 215ec2ddc6 * New primop __toXML (or builtins.toXML) to convert an expression to 
an XML representation stored in a string.  This should be useful to
  pass structured information to builders.
 2006-08-24 14:34:29 +00:00
Eelco Dolstra 38f18aa6d4 * New primop: abort "error message". 2006-08-23 15:46:00 +00:00
Eelco Dolstra 4a053bfdfd * A new primop `builtins', which returns an attribute set containing 
all the primops.  This allows Nix expressions to test for new
  primops and take appropriate action if they're not available.  For
  instance, rather than calling a primop `foo' directly, they could
  say `if builtins ? foo then builtins.foo ... else ...'.
 2006-08-23 14:39:11 +00:00
Eelco Dolstra 93d9797eda * Urgh (see NIX-56). 2006-08-22 09:34:38 +00:00
Eelco Dolstra 4874fd2d9a * Test for `nix-instantiate --eval-only --xml'. 2006-08-17 11:28:29 +00:00
Eelco Dolstra fe101fa785 * Meh. 2006-08-16 10:29:43 +00:00
Eelco Dolstra bfe19b3c37 * A test for NIX-53. 2006-08-16 10:23:02 +00:00
Eelco Dolstra f4c5531d92 * New language feature: domain checks, which check whether a function 
argument has a valid value, i.e., is in a certain domain.  E.g.,

    { foo : [true false]
    , bar : ["a" "b" "c"]
    }: ...

  This previously could be done using assertions, but domain checks
  will allow the buildfarm to automatically extract the configuration
  space from functions.
 2006-07-24 16:35:34 +00:00
Eelco Dolstra b545c669a0 * Tests for domain checks. 2006-07-24 15:50:29 +00:00
Eelco Dolstra 57751fdb55 * Refactoring to support domain checks. 2006-07-24 15:16:03 +00:00
Eelco Dolstra 2b4b0658fa * This expression has an undefined variable which isn't detected, so 
evaluation fails:

    error: impossible: undefined variable `gcc'
 2006-07-10 17:35:00 +00:00
Eelco Dolstra 5cabd47394 * Allow function argument default values to refer to other arguments 
of the function.  Implements NIX-45.
 2006-05-08 12:52:47 +00:00
Eelco Dolstra ae55e79541 * More tests. 2006-05-02 11:20:55 +00:00
Eelco Dolstra dca43ef795 * Tests for NIX-45. 2006-05-02 11:15:04 +00:00
Eelco Dolstra 0064599a27 * String interpolation. Expressions like 
"--with-freetype2-library=" + freetype + "/lib"

  can now be written as

    "--with-freetype2-library=${freetype}/lib"

  An arbitrary expression can be enclosed within ${...}, not just
  identifiers.

* Escaping in string literals: \n, \r, \t interpreted as in C, any
  other character following \ is interpreted as-is.
  
* Newlines are now allowed in string literals.
 2006-05-01 14:01:47 +00:00
Eelco Dolstra 6cecad2be0 * Allow string concatenations involving derivations, e.g., 
configureFlags = "--with-freetype2-library="
      + freetype + "/lib";
 2006-05-01 09:56:56 +00:00
Eelco Dolstra fa95f4be3f * More test coverage. 2006-03-01 16:26:13 +00:00
Eelco Dolstra 44409f52c1 * "Fix" the test, since we cannot feasibly support the intended semantics. 2005-11-17 11:58:22 +00:00
Eelco Dolstra 1f285cf556 * Scoping bug in `with'. 2005-11-04 14:50:33 +00:00
Eelco Dolstra 991a130b1e * Added a list concatenation operator: 
[1 2 3] ++ [4 5 6] => [1 2 3 4 5 6]
 2005-07-25 15:05:34 +00:00
Eelco Dolstra 040140dd1c * Added a primop `removeAttrs' to remove attributes from a set, e.g., 
`removeAttrs attrs ["x", "y"]' returns the set `attrs' with the
  attributes named `x' and `y' removed.  It is not an error for the
  named attributes to be missing from the input set.
 2005-05-18 17:19:21 +00:00
Eelco Dolstra 08df443618 * Check for duplicate attributes and formal parameters in Nix 
expressions.
 2005-03-10 11:33:46 +00:00
Eelco Dolstra ed09821859 * Use atdiff' instead of cmp' for checking test output. 
* Don't use local file names in tests since they will produce
  different parse trees depending on the current directory.
 2004-10-27 13:12:58 +00:00
Eelco Dolstra 3277c9432a * Bug fix in parsing of /* ... */ comments; due to longest match 
regexp there could be only one such comment per file.
 2004-10-27 13:00:31 +00:00
Eelco Dolstra 463e2817c5 * Remove ancient Fix tests. 
* Add automated Nix expression language tests.
 2004-10-27 12:41:53 +00:00