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author | Adrian Kummerlaender | 2017-04-12 16:47:45 +0200 |
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committer | Adrian Kummerlaender | 2017-04-12 16:47:45 +0200 |
commit | 900c223ed40e36ffedce95e9a987d9a3c0309271 (patch) | |
tree | 36796ac25968a20a3d8b1d217392e59a25cc4f33 /src/primitives.d | |
parent | 45e4fe29a237ae5cda4147c803046ff5f6793770 (diff) | |
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Implementent conditional primitive
Diffstat (limited to 'src/primitives.d')
-rw-r--r-- | src/primitives.d | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/primitives.d b/src/primitives.d index 0be6836..f577713 100644 --- a/src/primitives.d +++ b/src/primitives.d @@ -6,8 +6,21 @@ import src.stack; import src.definition; int[string] variables; +bool drop_mode; + +bool evaluate(int value) { + return drop_mode; +} bool evaluate(string word) { + if ( drop_mode ) { + if ( word == "then" ) { + drop_mode = false; + } + + return true; + } + switch ( word ) { case "ยง": src.definition.start; @@ -25,6 +38,20 @@ bool evaluate(string word) { stack.push(variables[name]); } return true; + case "if": + switch ( stack.pop.get!int ) { + case 0: + drop_mode = true; + return true; + case 1: + drop_mode = false; + return true; + default: + throw new Exception("invalid logic value"); + } + case "then": + drop_mode = false; + return true; case "+": int b = stack.pop.get!int; int a = stack.pop.get!int; |