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Try to execute the "instruction" instruction.
- If it returns 'ok then execute the "ok" instruction, or if there is no "ok" instruction skip to the next instruction after the "try" instruction.
- If it returns 'warning then execute the "warning" instruction, or if there is no "warning" instruction propagate the 'warning to the first enclosing "try" instruction.
- If it returns 'error then execute the "error" instruction, or if there is no "error" instruction propagate the 'error to the first enclosing "try" instruction.
- If it returns 'cancelled then execute the "cancelled" instruction, or if there is no "cancelled" instruction propagate the 'cancelled to the first enclosing "try" instruction.
Note: Since "try" is a reserved NewtonScript keyword, it should be enclosed between "|".
Example of script fragment that sends an AT escape sequence (+++) to a modem, waits one seconds for an OK answer, and continues execution even if it doesn't receive the OK:
{
toolSymbol: 'SendATEscape,
},
{
toolSymbol: '|Try|,
instruction: {
toolSymbol: 'WaitForString,
string: "OK" & unicodeCR & unicodeLF,
timeout: 1000,
},
warning: 'ok,
},
// The following instructions will be executed even if a timeout has
// occured, because the timeout generates a 'warning which is handled
// by the "try" instruction and converted to a 'ok.
...
* cancelled
type: instruction
default value: nil
* error
type: instruction
default value: nil
* instruction
type: instruction
default value: nil
* warning
type: instruction
default value: nil
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