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add support for comparison operators.

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This commit is contained in:
Mark Thom
2017-12-03 17:44:51 -07:00
parent db38f091a8
commit 7b569becbe
9 changed files with 158 additions and 35 deletions
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8
src/prolog/builtins.rs
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@@ -140,6 +140,14 @@ pub fn build_code_dir() -> (Code, CodeDir, OpDir)
op_dir.insert((String::from(">>"), Fixity::In), (YFX, 400));
op_dir.insert((String::from("mod"), Fixity::In), (YFX, 400));
op_dir.insert((String::from("rem"), Fixity::In), (YFX, 400));
// arithmetic comparison operators.
op_dir.insert((String::from(">"), Fixity::In), (XFX, 700));
op_dir.insert((String::from("<"), Fixity::In), (XFX, 700));
op_dir.insert((String::from("=\\="), Fixity::In), (XFX, 700));
op_dir.insert((String::from("=:="), Fixity::In), (XFX, 700));
op_dir.insert((String::from(">="), Fixity::In), (XFX, 700));
op_dir.insert((String::from("=<"), Fixity::In), (XFX, 700));
// there are 63 registers in the VM, so call/N is defined for all 0 <= N <= 62
// (an extra register is needed for the predicate name)