bf050c012f
the $FG_ROOT/Nasal/*.nas ones are done. This allows to use props.Node etc.
immediately, without requirement for settimer(func{}, 0) constructions.
Rationale:
- clean separation of local additions (and hacks :-) from standard files
- users might not have write permission to $FG_ROOT/Nasal/ or shouldn't
have to su to root for writing Nasal code
141 lines
4.4 KiB
Text
141 lines
4.4 KiB
Text
##
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# Returns true if the first object is an instance of the second
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# (class) object. Example: isa(someObject, props.Node)
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#
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isa = func {
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obj = arg[0]; class = arg[1];
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if(obj == nil or !contains(obj, "parents")) { return 0; }
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foreach(c; obj.parents) {
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if(c == class) { return 1; }
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elsif(isa(obj, c)) { return 1; }
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}
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return 0;
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}
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##
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# Invokes a FlightGear command specified by the first argument. The
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# second argument specifies the property tree to be passed to the
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# command as its argument. It may be either a props.Node object or a
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# string, in which case it specifies a path in the global property
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# tree.
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#
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fgcommand = func(cmd, node=nil) {
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if(isa(node, props.Node)) node = node._g;
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_fgcommand(cmd, node);
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}
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##
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# Returns the SGPropertyNode argument to the currently executing
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# function. Wrapper for the internal _cmdarg function that retrieves
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# the ghost handle to the argument and wraps it in a
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# props.Node object.
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#
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cmdarg = func { props.wrapNode(_cmdarg()) }
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##
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# Utility. Does what it you think it does.
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#
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abs = func { if(arg[0] < 0) { -arg[0] } else { arg[0] } }
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##
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# Convenience wrapper for the _interpolate function. Takes a
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# single string or props.Node object in arg[0] indicating a target
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# property, and a variable-length list of time/value pairs. Example:
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#
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# interpolate("/animations/radar/angle",
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# 180, 1, 360, 1, 0, 0,
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# 180, 1, 360, 1, 0, 0,
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# 180, 1, 360, 1, 0, 0,
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# 180, 1, 360, 1, 0, 0,
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# 180, 1, 360, 1, 0, 0,
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# 180, 1, 360, 1, 0, 0,
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# 180, 1, 360, 1, 0, 0,
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# 180, 1, 360, 1, 0, 0);
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#
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# This will swing the "radar dish" smoothly through 8 revolutions over
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# 16 seconds. Note the use of zero-time interpolation between 360 and
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# 0 to wrap the interpolated value properly.
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#
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interpolate = func {
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if(isa(arg[0], props.Node)) { arg[0] = arg[0]._g; }
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elsif(typeof(arg[0]) != "scalar") { return; }
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_interpolate(arg[0], size(arg) == 1 ? [] : subvec(arg, 1));
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}
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##
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# Convenience wrapper for the _setlistener function. Takes a
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# single string or props.Node object in arg[0] indicating the
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# listened to property, a function in arg[1], and an optional
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# bool in arg[2], which triggers the function initially if true.
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#
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setlistener = func {
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if(isa(arg[0], props.Node)) { arg[0] = arg[0]._g; }
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var id = _setlistener(arg[0], arg[1], size(arg) > 2 ? arg[2] : 0);
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if(__.log_level <= 2) {
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var c = caller(1);
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print(sprintf("setting listener #%d in %s, line %s", id, c[2], c[3]))
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}
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return id;
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}
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##
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# Returns true if the symbol name is defined in the caller, or the
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# caller's lexical namespace. (i.e. defined("varname") tells you if
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# you can use varname in an expression without a undefined symbol
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# error.
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#
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defined = func(sym) {
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var fn = 1;
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while((var frame = caller(fn)) != nil) {
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if(contains(frame[0], sym)) { return 1; }
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fn += 1;
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}
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return 0;
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}
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##
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# Print log messages in appropriate --log-level.
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# Usage: printlog("warn", "...");
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# The underscore hash prevents helper functions/variables from
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# needlessly polluting the global namespace.
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#
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__ = {};
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__.dbg_types = { none:0, bulk:1, debug:2, info:3, warn:4, alert:5 };
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__.log_level = __.dbg_types[getprop("/sim/logging/priority")];
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printlog = func(level, args...) {
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if(__.dbg_types[level] >= __.log_level) { call(print, args); }
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}
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##
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# Load and execute ~/.fgfs/Nasal/*.nas files in alphabetic order
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# after all $FG_ROOT/Nasal/*.nas files were loaded.
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#
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_setlistener("/sim/signals/nasal-dir-initialized", func {
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var path = getprop("/sim/fg-home") ~ "/Nasal";
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if ((var dir = directory(path)) == nil) return;
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foreach (var file; sort(dir, cmp)) {
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if (substr(file, -4) != ".nas") continue;
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var module = substr(file, 0, size(file) - 4);
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file = path ~ "/" ~ file;
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printlog("info", ">>> executing local Nasal file ", file);
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if (!contains(globals, module)) var locals = globals[module] = {};
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elsif (typeof(globals[module]) == "hash") var locals = globals[module];
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else var locals = {};
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var err = [];
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var code = call(func { compile(io.readfile(file), file) }, nil, err);
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if (size(err)) {
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print(file ~ ": " ~ err[0]);
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continue;
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}
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call(bind(code, globals), nil, nil, locals, err);
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debug.printerror(err);
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}
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});
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