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/usr/share/highlight/langDefs/psl.lang is in highlight-common 3.18-3.

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The actual contents of the file can be viewed below.

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-- Language definition generated by lang2to3

Description="PATROL"

Keywords={
  { Id=1,
    List={"else", "elsif", "exit", "export", "foreach", "function", "if",
    "last", "local", "main", "next", "requires", "return", "switch", "while"},
  },
  { Id=2,
    List={"acos", "annotate", "annotate_get", "asctime", "asin", "atan", 
"blackout", "cat", "ceil", "chan_exists", "change_state", "close", 
"cond_signal", "cond_wait", "console_type", "convert_date", "cos", "cosh", 
"create", "date", "debugger", "destroy", "destroy_lock", "difference", 
"event_archive", "event_catalog_get", "event_check", "event_query", 
"event_range_manage", "event_range_query", "event_report", "event_schedule", 
"event_trigger", "event_trigger2", "execute", "exists", "exp", "fabs", "file", 
"floor", "fmod", "fopen", "fseek", "ftell", "full_discovery", "get", 
"get_chan_info", "getenv", "getpid", "get_ranges", "get_vars", "grep", 
"history", "history_get_retention", "index", "int", "internal", "intersection", 
"in_transition", "isnumber", "is_var", "kill", "length", "lines", "lock", "log", 
"loge", "log10", "ntharg", "nthargf", "nthline", "nthlinef", "num_consoles", 
"pconfig", "popen", "pow", "print", "printf", "proc_exists", "process", 
"Pslexecute", "random", "read", "readln", "refresh_parameters", 
"remote_close", "remote_event_query", "remote_event_trigger", 
"remote_file_send", "remote_open", "response", "", "response_get_value", 
"rindex", "set", "share", "sin", "sinh", "sleep", "snmp_agent_config", 
"snmp_agent_stop", "snmp_close", "snmp_config", "_snmp_debug", "snmp_get", 
"snmp_get_next", "snmp_h_get", "snmp__h_get_next", "snmp_h_set", "snmp_open", 
"snmp_set", "snmp_trap_ignore", "snmp_trap_listen", "snmp_trap_raise_std_trap", 
"snmp_trap_receive", "snmp_trap_register_im", "snmp_trap_send", "snmp_walk", 
"sort", "sprintf", "sqrt", "srandom", "subset", "substr", "system", "tail", 
"tanh", "time", "tmpnam", "tolower", "toupper", "trim", "union", "unique", 
"unlock", "unset", "va_arg", "va_start", "write"},
  },
}

Strings={
  Delimiter=[["]],
}

IgnoreCase=true

Comments={
  { Block=false,
    Delimiter= { [[#]] },
  },
}

Operators=[[\(|\)|\[|\]|\{|\}|\,|\;|\:|\&|<|>|\!|\=|\/|\*|\%|\+|\-]]