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d7efd76394
concatenation and string coercion. This was a big mess (see
e.g. NIX-67). Contexts are now folded into strings, so that they
don't cause evaluation errors when they're not expected. The
semantics of paths has been clarified (see nixexpr-ast.def).
toString() and coerceToString() have been merged.
Semantic change: paths are now copied to the store when they're in a
concatenation (and in most other situations - that's the
formalisation of the meaning of a path). So
"foo " + ./bla
evaluates to "foo /nix/store/hash...-bla", not "foo
/path/to/current-dir/bla". This prevents accidental impurities, and
is more consistent with the treatment of derivation outputs, e.g.,
`"foo " + bla' where `bla' is a derivation. (Here `bla' would be
replaced by the output path of `bla'.)
55 lines
866 B
C++
55 lines
866 B
C++
#ifndef __ATERM_H
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#define __ATERM_H
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#include <aterm2.h>
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#include "types.hh"
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namespace nix {
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/* Print an ATerm. */
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string atPrint(ATerm t);
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class ATermIterator
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{
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ATermList t;
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public:
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ATermIterator(ATermList _t) : t(_t) { }
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ATermIterator & operator ++ ()
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{
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t = ATgetNext(t);
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return *this;
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}
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ATerm operator * ()
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{
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return ATgetFirst(t);
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}
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operator bool ()
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{
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return t != ATempty;
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}
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};
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/* Throw an exception with an error message containing the given
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aterm. */
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Error badTerm(const format & f, ATerm t);
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/* Convert strings to ATerms. */
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ATerm toATerm(const char * s);
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ATerm toATerm(const string & s);
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ATermList toATermList(const StringSet & ss);
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}
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/* Write an ATerm to an output stream. */
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std::ostream & operator << (std::ostream & stream, ATerm e);
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#endif /* !__ATERM_H */
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