ircii_syntax
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| + | ======Syntax of the ircII language:====== | ||
| + | The ircII language is organized into //blocks//. | ||
| + | |||
| + | A //block// is a sequence of //statements// separated by semicolons. | ||
| + | |||
| + | A //statement// is one of the following | ||
| + | * A //command statement// | ||
| + | * An //expression statement// | ||
| + | * A //block statement// | ||
| + | |||
| + | A //command statement// is of the form | ||
| + | command arguments | ||
| + | The //command// is separated from the //arguments// by a [[space character]]. | ||
| + | The //command// is either an [[alias command|alias]] or a //built-in command//. | ||
| + | |||
| + | A //expression statement// is of the form | ||
| + | @expression | ||
| + | or | ||
| + | (expression) | ||
| + | The [[expressions|expression]] is evaluated, but it's return value is ignored. | ||
| + | |||
| + | A //block statement// is of the form | ||
| + | { block } | ||
| + | which allows you to nest [[block]]s anywhere you need them. | ||
| + | |||
| + | =====Expando substitution:===== | ||
| + | All //command statements// undergo expando-substitution ($'s are expanded) | ||
| + | before the //command// is separated from the //arguments//. This is a | ||
| + | deliberate feature that allows you to use variables as commands. This | ||
| + | expansion is global over the entire statement and occurs regardless of | ||
| + | what the command actually ends up being. There is no way to override this | ||
| + | on a command-by-command basis. | ||
| + | |||
| + | //Expression statements// do not undergo expando-substitution, although | ||
| + | some operators do permit expandos to be operands. Those expandos are | ||
| + | expanded on a case-by-case basis by the expression parser. | ||
| + | |||
| + | //Block statements// never undergo expando-substitution, although any | ||
| + | //command statements// contained within will be as they are executed. | ||
| + | |||
| + | |||
ircii_syntax.txt ยท Last modified: 2007/02/12 22:57 (external edit)