Implemented switch statements

src/build/core/CompileSwitch.go

@@ -0,0 +1,55 @@
+package core
+
+import (
+	"fmt"
+
+	"git.akyoto.dev/cli/q/src/build/asm"
+	"git.akyoto.dev/cli/q/src/build/ast"
+)
+
+// CompileSwitch compiles a multi-branch instruction.
+func (f *Function) CompileSwitch(s *ast.Switch) error {
+	f.count.multiBranch++
+	end := fmt.Sprintf("%s_switch_%d_end", f.UniqueName, f.count.multiBranch)
+
+	for _, branch := range s.Cases {
+		if branch.Condition == nil {
+			f.PushScope(branch.Body, f.File.Bytes)
+			err := f.CompileAST(branch.Body)
+
+			if err != nil {
+				return err
+			}
+
+			f.PopScope()
+			break
+		}
+
+		f.count.branch++
+
+		var (
+			success = fmt.Sprintf("%s_case_%d_true", f.UniqueName, f.count.branch)
+			fail    = fmt.Sprintf("%s_case_%d_false", f.UniqueName, f.count.branch)
+			err     = f.CompileCondition(branch.Condition, success, fail)
+		)
+
+		if err != nil {
+			return err
+		}
+
+		f.AddLabel(success)
+		f.PushScope(branch.Body, f.File.Bytes)
+		err = f.CompileAST(branch.Body)
+
+		if err != nil {
+			return err
+		}
+
+		f.Jump(asm.JUMP, end)
+		f.PopScope()
+		f.AddLabel(fail)
+	}
+
+	f.AddLabel(end)
+	return nil
+}