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In this section we will develop three handcrafted parsers The rst is little more than an extension of the key value regex seen in the previous chapter, but shows the infrastructure needed to use such a regex The second is also regex-based, but is actually a nite state automata since it has two states Both the rst and second examples are data parsers The third example is a parser for a DSL and uses recursive descent since the DSL allows expressions to be nested In later sections we will develop new versions of these parsers using PyParsing and PLY, and for the DSL in particular we will see how much easier it is to use a generic parser generator than to handcraft a parser

while (!thisdone) Threadsleep(1000);

DN: uid=andy2, ou=People, o=airiuscom cn: Andy Jones mail: andy2@airiuscom telephoneNumber NOT PRESENT

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The book s examples include a program called playlistspy This program can read a playlist in m3u (extended Moving Picture Experts Group Audio Layer 3 Uniform Resource Locator) format, and output an equivalent playlist in pls (Play List 2) format or vice versa In this subsection we will write a parser for pls format, and in the following subsection we will write a parser for m3u format Both parsers are handcrafted and both use regexes The pls format is essentially the same as Windows ini format, so we ought to use the standard library s configparser module to parse it However, the pls format is ideal for creating a rst data parser, since its simplicity leaves us free to focus on the parsing aspects, so for the sake of example we won t use the configparser module in this case We will begin by looking at a tiny extract from a pls le to get a feel for the data, then we will create a BNF, and then we will create a parser to read the data The extract is shown in Figure 144 We have omitted most of the data as indicated by the ellipsis ( ) There is only one ini-style header line, [playlist], with all the other entries in simple key=value format One unusual aspect is that key names are repeated but with numbers appended to keep them all unique Three pieces of data are maintained for each song: the lename (in this example using Windows path separators), the title, and the duration (called length ) in seconds In this particular example, the rst song has a known duration, but the last entry s duration is unknown, which is signi ed by a negative number

The compiler is free to read the eld thisdone just once, and reuse the cached value in each execution of the loop This would mean that the loop would never terminate, even if another thread changed the value of thisdone

539

3 Attribute present and has one or more values This condition is the most common for most searches The following LDIF record has multiple values for the telephoneNumber attribute Often programmers are interested in only one value, but they must be prepared for the occurrence of multiple values

Quali edIdenti er: Identi er { Identi er }

555

dn: uid=andy3, ou=People, o=airiuscom ou: People cn: Andy Stevens telephoneNumber: 650-555-1212 telephoneNumber: 650-555-1213

The grammar presented piecemeal in the preceding chapters is much better for exposition, but it is not well suited as a basis for a parser The grammar presented in this chapter is the basis for the reference implementation Note that it is not an LL(1) grammar, though in many cases it minimizes the necessary look ahead The grammar below uses the following BNF-style conventions:

[playlist] File1=Blondie\Atomic\01-Atomicogg Title1=Blondie - Atomic Length1=230 File18=Blondie\Atomic\18-I'm Gonna Love You Tooogg Title18=Blondie - I'm Gonna Love You Too Length18=-1 NumberOfEntries=18 Version=2

Literal: IntegerLiteral FloatingPointLiteral CharacterLiteral StringLiteral BooleanLiteral NullLiteral

The output from prettyPrint is as follows:

The BNF we have created can handle pls les, and is actually generic enough to handle similar key value formats too The BNF is shown in Figure 145

Type: Identi er [TypeArguments]{ Identi er [TypeArguments]} {[]} BasicType TypeArguments: < TypeArgument {, TypeArgument} >

PLS LINE INI_HEADER KEY_VALUE KEY VALUE COMMENT BLANK ::= ::= ::= ::= ::= ::= ::= ::= (LINE '\n')+ INI_HEADER | KEY_VALUE | COMMENT | BLANK '[' [^]]+ ']' KEY \s* '=' \s* VALUE \w+ + #* ^$

DN: uid=andy3, ou=People, o=airiuscom cn: Andy Stevens mail: andy3@airiuscom telephoneNumber: 650-555-1212 telephoneNumber: 650-555-1213

TypeArgument: Type [( extends | super ) Type]

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