80 lines
2.2 KiB
Go
80 lines
2.2 KiB
Go
// Copyright 2010 The postscript-go Authors. All rights reserved.
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// created: 13/12/2010 by Laurent Le Goff
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package postscript
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import (
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"log"
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)
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// any exec – Execute arbitrary object
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func exec(interpreter *Interpreter) {
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value := interpreter.Pop()
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if pdef, ok := value.(*ProcedureDefinition); ok {
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NewProcedure(pdef).Execute(interpreter)
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} else if procedure, ok := value.(*Procedure); ok {
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procedure.Execute(interpreter)
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} else {
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log.Printf("Push value: %v\n", value)
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interpreter.Push(value)
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}
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}
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func ifoperator(interpreter *Interpreter) {
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operator := NewProcedure(interpreter.PopProcedureDefinition())
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condition := interpreter.PopBoolean()
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if condition {
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operator.Execute(interpreter)
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}
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}
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func ifelse(interpreter *Interpreter) {
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operator2 := NewProcedure(interpreter.PopProcedureDefinition())
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operator1 := NewProcedure(interpreter.PopProcedureDefinition())
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condition := interpreter.PopBoolean()
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if condition {
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operator1.Execute(interpreter)
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} else {
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operator2.Execute(interpreter)
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}
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}
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func foroperator(interpreter *Interpreter) {
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proc := NewProcedure(interpreter.PopProcedureDefinition())
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limit := interpreter.PopFloat()
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inc := interpreter.PopFloat()
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initial := interpreter.PopFloat()
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for i := initial; i <= limit; i += inc {
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interpreter.Push(i)
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proc.Execute(interpreter)
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}
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}
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func repeat(interpreter *Interpreter) {
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proc := NewProcedure(interpreter.PopProcedureDefinition())
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times := interpreter.PopInt()
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for i := 0; i <= times; i++ {
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proc.Execute(interpreter)
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}
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}
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// any stopped bool -> Establish context for catching stop
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func stopped(interpreter *Interpreter) {
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value := interpreter.Pop()
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if pdef, ok := value.(*ProcedureDefinition); ok {
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NewProcedure(pdef).Execute(interpreter)
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} else {
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interpreter.Push(value)
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}
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interpreter.Push(false)
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}
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func initControlOperators(interpreter *Interpreter) {
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interpreter.SystemDefine("exec", NewOperator(exec))
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interpreter.SystemDefine("if", NewOperator(ifoperator))
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interpreter.SystemDefine("ifelse", NewOperator(ifelse))
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interpreter.SystemDefine("for", NewOperator(foroperator))
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interpreter.SystemDefine("repeat", NewOperator(repeat))
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interpreter.SystemDefine("stopped", NewOperator(stopped))
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}
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