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add support for rational numbers, division.

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This commit is contained in:
Mark Thom
2017-12-02 11:10:25 -07:00
parent a65adf960e
commit 9a7419c507
10 changed files with 218 additions and 71 deletions
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src/prolog/builtins.rs
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@@ -128,9 +128,11 @@ pub fn build_code_dir() -> (Code, CodeDir, OpDir)
op_dir.insert((String::from("+"), Fixity::In), (YFX, 500));
op_dir.insert((String::from("-"), Fixity::In), (YFX, 500));
op_dir.insert((String::from("//"), Fixity::In), (YFX, 400));
op_dir.insert((String::from("/"), Fixity::In), (YFX, 400));
op_dir.insert((String::from("div"), Fixity::In), (YFX, 400));
op_dir.insert((String::from("*"), Fixity::In), (YFX, 400));
op_dir.insert((String::from("-"), Fixity::Pre), (FY, 200));
op_dir.insert((String::from("rdiv"), Fixity::In), (YFX, 400));
// 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)