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language:start [2018-10-11 09:35 SLT] sei Add basic structure of a script; add a little introduction to reserved keywords |
language:start [2018-10-11 10:08 SLT] (current) sei words -> keywords |
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| `<other_states`> are zero or more states. If you need more states than $kw[default], you can define them with the keyword $kw[state] followed by the state name, then an open brace symbol ''{'', then one or more event declarations, and finally a close brace symbol ''}''. See $lkw[state] for more information. | `<other_states`> are zero or more states. If you need more states than $kw[default], you can define them with the keyword $kw[state] followed by the state name, then an open brace symbol ''{'', then one or more event declarations, and finally a close brace symbol ''}''. See $lkw[state] for more information. | ||
| + | |||
| + | The shortest script that can be written is: | ||
| + | |||
| + | <code lsl2> | ||
| + | default{timer(){}} | ||
| + | </code> | ||
| + | |||
| + | which has a $kw[default] state containing a $ev[timer] event, which will do nothing because the script lacks the code necessary to trigger it. So, this script does nothing at all. | ||
| + | |||
| + | Spaces and newlines between words or symbols can be used at will, with some exceptions. For example, the above minimalistic, do-nothing script can be rewritten in a more readable way, as follows: | ||
| + | |||
| + | <code lsl2> | ||
| + | default | ||
| + | { | ||
| + | timer() | ||
| + | { | ||
| + | } | ||
| + | } | ||
| + | </code> | ||
| + | |||
| + | Names must start with a letter or underscore ''_'', and may be followed by any sequence of letters, numbers or underscores. For example, ''_'', ''____'', ''X2392Z'', ''_1st'', ''abracadabra'' and ''My_name'' are all valid names; ''1st'' and ''N#1'' are not. Names must not have any spaces in between. | ||
| + | |||
| + | No spaces can appear between composite symbols that are formed by two symbols, like ''++'' or ''>=''. In some pathological cases, a space can even change the meaning of an expression; for example, ''a * --b'' is not the same as ''a * - -b''. | ||
| Any names can be used for variables, functions, function parameters, states or labels that you define, except for a few that can't because they have special meanings for the language. Those which have special meanings are called //reserved keywords//. | Any names can be used for variables, functions, function parameters, states or labels that you define, except for a few that can't because they have special meanings for the language. Those which have special meanings are called //reserved keywords//. | ||
| Line 35: | Line 58: | ||
| * <wrap important>$lkw[print]</wrap>: Obsolete debug message printing method that does nothing. Do not use; use $lfn[llOwnerSay] or similar instead. | * <wrap important>$lkw[print]</wrap>: Obsolete debug message printing method that does nothing. Do not use; use $lfn[llOwnerSay] or similar instead. | ||
| - | In addition to all these, all [[/types/]], [[/events/]] and [[/constants/]] are also reserved words, meaning you can't use them as names for your own variables, labels, states, parameters or functions. The library [[/functions/]] are not reserved words (you can't define a function with a name of a library function, because they are in the global namespace, but you //can// use the same name for your own variables or parameters — not that you would want to, though). | + | In addition to all these, all [[/types/]], [[/events/]] and [[/constants/]] are also reserved keywords, meaning you can't use them as names for your own variables, labels, states, parameters or functions. The library [[/functions/]] are not reserved words (you can't define a function with a name of a library function, because they are in the global namespace, but you //can// use the same name for your own variables or parameters — not that you would want to, though). |
| See also a list of the $lkw[symbols] allowed. | See also a list of the $lkw[symbols] allowed. | ||