fix wrong git ignore

internal/pdf/ps/exec.go

@@ -0,0 +1,60 @@
+package ps
+
+// A limited postscript parser for PDF function type 4.
+
+import (
+	"fmt"
+
+	"gitea.tecamino.com/paadi/pdfmerge/internal/pdf/common"
+)
+
+// A PSExecutor has its own execution stack and is used to executre a PS routine (program).
+type PSExecutor struct {
+	Stack   *PSStack
+	program *PSProgram
+}
+
+func NewPSExecutor(program *PSProgram) *PSExecutor {
+	executor := &PSExecutor{}
+	executor.Stack = NewPSStack()
+	executor.program = program
+	return executor
+}
+
+func PSObjectArrayToFloat64Array(objects []PSObject) ([]float64, error) {
+	vals := []float64{}
+
+	for _, obj := range objects {
+		if number, is := obj.(*PSInteger); is {
+			vals = append(vals, float64(number.Val))
+		} else if number, is := obj.(*PSReal); is {
+			vals = append(vals, number.Val)
+		} else {
+			return nil, fmt.Errorf("Type error")
+		}
+	}
+
+	return vals, nil
+}
+
+func (this *PSExecutor) Execute(objects []PSObject) ([]PSObject, error) {
+	// Add the arguments on stack
+	// [obj1 obj2 ...]
+	for _, obj := range objects {
+		err := this.Stack.Push(obj)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	err := this.program.Exec(this.Stack)
+	if err != nil {
+		common.Log.Debug("Exec failed: %v", err)
+		return nil, err
+	}
+
+	result := []PSObject(*this.Stack)
+	this.Stack.Empty()
+
+	return result, nil
+}