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https://github.com/privatevoid-net/nix-super.git
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56 lines
1.1 KiB
C++
56 lines
1.1 KiB
C++
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#ifndef __ATERM_H
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#define __ATERM_H
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extern "C" {
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#include <aterm2.h>
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}
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#include "util.hh"
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/* Print an ATerm. */
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string atPrint(ATerm t);
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/* Write an ATerm to an output stream. */
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ostream & operator << (ostream & stream, ATerm e);
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/* Type-safe matching. */
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struct ATMatcher
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{
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ATerm t;
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int pos;
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const static int failPos = -2;
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const static int funPos = -1;
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ATMatcher() : t(0), pos(failPos)
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{
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}
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operator bool() const
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{
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return pos != failPos;
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}
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};
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/* Initiate matching of a term. */
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ATMatcher & atMatch(ATMatcher & pos, ATerm t);
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/* Get the next argument of an application. */
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ATMatcher & operator >> (ATMatcher & pos, ATerm & out);
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/* Get the name of the function symbol of an applicatin, or the next
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argument of an application as a string. */
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ATMatcher & operator >> (ATMatcher & pos, string & out);
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/* Like the previous, but check that the string is equal to the given
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string. */
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ATMatcher & operator >> (ATMatcher & pos, const string & s);
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/* Get the next argument of an application, and verify that it is a
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list. */
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ATMatcher & operator >> (ATMatcher & pos, ATermList & out);
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#endif /* !__ATERM_H */
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