## PHP 5.5: The Power to Yield

In PHP 5.5 we get a new keyword called yield. It is a language feature that allows us to create iterator style Generators in a very easy way by just defining a single function. Before PHP 5.5 you had two…

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In PHP 5.5 we get a new keyword called yield. It is a language feature that allows us to create iterator style Generators in a very easy way by just defining a single function. Before PHP 5.5 you had two…

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In the section on numeric types in QuantLib, the Rate type was introduced which was intended to hold any kind of rates, including interest rates. The Rate type is essentially a double or a float number, depending on the configuration at…

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During the course of this series we have written a tokenizer, designed a grammar, implemented the grammar in a recursive descent parser and built an expression tree that corresponds to the mathematical expression and that is able to calculate a…

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In the last post I created classes that can represent a mathematical expression in the form of a tree data structure. We saw how expressions could be stored and evaluated but the code was not linked to the parser yet….

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The last post in this series showed you how a mathematical expression parser was implemented from the grammar that we designed earlier. This was all fine and good but the parser did not do much except confirm if a mathematical…

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In the last post about the Java expression parser we designed a grammar for analysing a mathematical expression. That was certainly all a bit abstract and theoretical for many readers. Now we are ready to put some meat on these…

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Previously I introduced the concept on the LL(1) grammar and explained how a parser would go about parsing an input. In this post I want to design a grammar that is capable of parsing mathematical expressions. Before we actually get…

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In the previous post in this series we wrote a tokenizer which splits the input into short segments called tokens. Each type of token is given a unique code and the input is reduced to a series of token codes….

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In this short series I am talking about how to write a parser that analyses mathematical expressions and turns them into an object tree that is able to evaluate that expression. The first step in writing a parser is to…

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The LastFixingQuote is an implementation of the abstract Quote class. LastFixingQuote represents a quote for the last available fixing of an index. Essentially it is a simple wrapper around the Index class to allow indices to be used as Quotes. class…

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