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Pragmatic directives: Difference between revisions
m
→{{header|REXX}}: added another SIGNAL construct.
m (→{{header|REXX}}: added SIGNAL & CALL on|off conditions.) |
m (→{{header|REXX}}: added another SIGNAL construct.) |
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::* OPTIONS {xxx yyy zzz}
::* TRACE {options}
::* SIGNAL {ON│OFF} SYNTAX▼
::* SIGNAL {ON│OFF} NOVALUE▼
::* SIGNAL {ON│OFF} LOSTDIGITS
▲::* SIGNAL {ON│OFF} NOVALUE
▲::* SIGNAL {ON│OFF} SYNTAX
::* SIGNAL│CALL {ON│OFF} ERROR
::* SIGNAL│CALL {ON│OFF} FAILURE
::* SIGNAL│CALL {ON│OFF} HALT
::* SIGNAL│CALL {ON│OFF} NOTREADY
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There are a number of options for
the '''trace''' instruction, and they won't be explained here.
===signal on syntax===▼
If the REXX interpreter detects a syntax error in the REXX▼
program, (and the REXX interpreter▼
<br>determines that the error can still be handled by the erroneous REXX▼
program), control branches▼
<br>to the label '''syntax'''. The label may be in mixed case.▼
===signal off syntax===▼
This indicates to take the default action which REXX issues an error message▼
and terminates the▼
<br>REXX program.▼
===signal on novalue===▼
If the REXX interpreter detects an uninitialized variable is used in an▼
evaluated expression, control▼
<br>branches to the label '''novalue'''. The label▼
may be in mixed case.▼
===signal off novalue===▼
This indicates to take the default action which is to quietly return the value of▼
the uppercase version▼
<br>of the variable name and continue execution of the REXX program.▼
===signal on lostdigits===
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condition and continue
<br>execution of the REXX program.
▲===signal on novalue===
▲If the REXX interpreter detects an uninitialized variable is used in an
▲evaluated expression, control
▲<br>branches to the label '''novalue'''. The label
▲may be in mixed case.
▲===signal off novalue===
▲This indicates to take the default action which is to quietly return the value of
▲the uppercase version
▲<br>of the variable name and continue execution of the REXX program.
▲===signal on syntax===
▲If the REXX interpreter detects a syntax error in the REXX
▲program, (and the REXX interpreter
▲<br>determines that the error can still be handled by the erroneous REXX
▲program), control branches
▲<br>to the label '''syntax'''. The label may be in mixed case.
▲===signal off syntax===
▲This indicates to take the default action which REXX issues an error message
▲and terminates the
▲<br>REXX program.
===signal on error; call on error===
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===signal off error; call off error===
This indicates to take the default action which means the special
variable '''RC''' ('''R'''eturn '''C'''ode)
<br>is quietly defined, and execution continues of the REXX program.
===signal on failure; call on failure===
If the REXX interpreter detects a failure from a
host system command issued by
<br>the REXX program, control branches to the
label '''failure'''. The label may be in mixed case.
===signal off failure; call off failure===
This indicates to take the default action which means the special
variable '''RC''' ('''R'''eturn '''C'''ode)
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