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