By Chris Eidhof, Airspeed Velocity

ISBN-10: 1523831715

ISBN-13: 9781523831715

Advanced quick takes you thru Swift’s good points, from low-level programming to high-level abstractions.

In this booklet, we’ll write approximately complicated ideas in fast programming. when you have learn the quick Programming advisor, and need to discover extra, this publication is for you.

Swift is a smart language for structures programming, but additionally lends itself for extraordinarily high-level programming. We’ll discover either high-level issues (for instance, programming with generics and protocols), in addition to low-level themes (for instance, wrapping a C library and string internals).

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Extra info for Advanced Swift

Example text

Y. times do |n| puts n end This is a very simple Ruby script, right? Since this is so short, it should’t be too difficult to trace the Ruby parser’s path through its grammar rules. times do |n| puts n end Grammar Rules program: top_compstmt top_compstmt: top_stmts opt_terms top_stmts: … | top_stmt | ... top_stmt: stmt | … stmt: … | expr expr: … | arg arg: … | primary primary: … | method_call brace_block | … On the left I show the code that Ruby is trying to parse. y file, shown in a simplified manner.

These nodes are saved in a tree structure called an Abstract Syntax Tree (or AST)… more on that in a minute. You can see one example of creating an AST node above, where Ruby calls the NEW_CALL C macro/function. This creates a new NODE_CALL node, which represents a method call. We’ll see later how Ruby eventually compiles this into byte code that can be executed by a virtual machine. y are also included in the Ripper tool. Now let’s learn how to use Ripper to display information about how Ruby parses your code.

Here’s how that works: • The C code that appears between the /*%%%*/ line and the /*% line is actually compiled into Ruby during the Ruby build process, and: 34 Chapter 1: Tokenization, Parsing and Compilation • The C code between /*% and %*/ is dropped when Ruby is built. Instead, this code is only used by the Ripper tool which is built separately during the Ruby build process. y. And what are these snippets actually doing? As you might guess Ruby uses the Ripper code snippets to allow the Ripper tool to display information about what Ruby is parsing.

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