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This avoids using the import * syntax which can pollute our namespace with unwanted names, but at the same time affords us the convenience to write alphanums and Word() rather than pyparsing_py3alphanums and pyparsing_py3Word(), and so on Before we nish this quick introduction to PyParsing and look at the examples in the following subsections, it is worth noting a couple of important ideas relating to how we translate a BNF into a PyParsing parser PyParsing has many prede ned elements that can match common constructs We should always use these elements wherever possible to ensure the best possible performance Also, translating BNFs directly into PyParsing syntax is not always the right approach PyParsing has certain idiomatic ways of handling particular BNF constructs, and we should always follow these to ensure that our parser runs ef ciently Here we ll very brie y review a few of the prede ned elements and idioms One common BNF de nition is where we have an optional item For example:

For type short, the default value is zero, that is, the value of (short)0 For type int, the default value is zero, that is, 0 For type long, the default value is zero, that is, 0L For type float, the default value is positive zero, that is, 00f For type double, the default value is positive zero, that is, 00d For type char, the default value is the null character, that is, '\u0000'

If we translated this directly into PyParsing we would write:

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None of the examples presented so far in this chapter have involved authenticating to the directory All connections have been anonymous (not using a DN or password) Most LDAP directories are con gured to allow anonymous searching of at least some of the information in the system, but some attributes may have access control con gured to prevent access For instance, the corporate directory at Netscape Communications Corporation does not allow anonymous connections to retrieve the JPEG photo of an employee Only security personnel or the employee corresponding to the entry may retrieve this attribute The same usually is true for the userPassword attribute as well If you ask for one of the required or commonly used attributes and it is not returned, more than likely access control has been con gured to prevent you from retrieving it We will cover authenticating to the directory in 6, when we will be modifying data, but to peek ahead for those who need to authenticate for a search or to retrieve a speci c attribute the additional method to call is shown here (indicated by bold):

Each method parameter ( 841) is initialized to the corresponding argument value provided by the invoker of the method ( 1512)

optional_item = item | Empty() # WRONG!

ld = new LDAPConnection(); ldconnect( HOST, PORT ); // Connect to server ldauthenticate( 3, authid, authpw ); // Bind by DN and password

Each constructor parameter ( 881) is initialized to the corresponding argument value provided by a class instance creation expression ( 159) or explicit constructor invocation ( 887)

This assumes that item is some parser element de ned earlier The Empty() class provides a parser element that can match nothing Although syntactically correct, this goes against the grain of how PyParsing works The correct PyParsing idiom is much simpler and involves using a prede ned element:

A local variable ( 144, 1414) must be explicitly given a value before it is used, by either initialization ( 144) or assignment ( 1526), in a way that can be veri ed by the compiler using the rules for de nite assignment ( 16) The example program:

The connect and authenticate steps can be combined:

optional_item = Optional(item)

class Point { static int npoints; int x, y; Point root; }

Some BNF statements involve de ning an item in terms of itself For example, to represent a list of variables (perhaps the arguments to a function), we might have the BNF:

ldconnect( 3, HOST, PORT, authid, authpw );

class Test { public static void main(String[] args) { Systemoutprintln("npoints=" + Pointnpoints); Point p = new Point(); Systemoutprintln("px=" + px + ", py=" + py); Systemoutprintln("proot=" + proot); } } npoints=0 px=0, py=0 proot=null

VAR_LIST ::= VARIABLE | VARIABLE ',' VAR_LIST VARIABLE ::= [a-zA-Z]\w*

prints: 72

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