| java.lang.Object
 edu.hws.jcm.functions.SummationParser
| SummationParser | | public class SummationParser implements ParserExtension(Code) | | The SummationParser class makes it possible to use summations such as sum(i,1,5,x^i) in a Parser.
The summation psedu-function has four parameters: (1) The summation variable, which must be an identifier;
(2) The lower limit for the summation, given as an expression; (3) The upper limit for the
summation, given as an expression; and (4) The expression that is summed. The values of
the lower and upper limit expressions are rounded to the nearest integer. The expression in
the fourth parameter can (and presumably will) use the summation variable (as well as other
identifiers known to the parser).
To use summations with a Parser p, just say p.add(new SummationParser()). It's unlikely that
you will ever need to do anything else with SummationParsers.
If you want to use a name other than "sum", you can change the name after creating the
SummationParser object but before adding it to a parser. (Note, by the way, that parsers by default do not do
factorials. If you want a parser that recognizes factorials, you could do something
like p = new Parser(Parser.DEFAULT_OPTIONS | Parser.FACTORIAL).)
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| Method Summary | |
| public void | doParse(Parser parser, ParserContext context)
When the name of this ParserExtension is encountered by a parser with which
the extension is registered, the parser calls this routine to parse the
summation subexpression. | | public String | getName()
Get the name, which will be used in place of "sum" in expressions. | | public void | setName(String name)
Set the name, which will be used in place of "sum" in expressions. |
| doParse | | public void doParse(Parser parser, ParserContext context)(Code) | | When the name of this ParserExtension is encountered by a parser with which
the extension is registered, the parser calls this routine to parse the
summation subexpression. The subexpression has the form
(,,,). This method is
not meant to be called directly
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| getName | | public String getName()(Code) | | Get the name, which will be used in place of "sum" in expressions.
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| setName | | public void setName(String name)(Code) | | Set the name, which will be used in place of "sum" in expressions. This should not
be done after the SummationParser has been added to a Parser. The default name is "sum".
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