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Slay::Makefile 0.01

  Date Added: March 25, 2010  |  Visits: 617


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Slay::Makefile is a wrapper to Slay::Maker that reads the rules from a file. SYNOPSIS Slay::Maker is a make engine that uses perl declaration syntax for rules, including regular expressions for targets and anonymous subs for targets, dependencies, and actions. This Slay::Makefile wrapper allows for the rules to be contained within a SlayMakefile file whose syntax is similar to that of a normal Makefile. FILE SYNTAX The file syntax is a series of statements where each statement is one of: < perl-block > < target(s) > : < dependencies > < actions > [-] include < filename > # Comment < perl-block > has the syntax: { < perl-statement(s) > } where < perl-statement(s) > is any series of perl statements. < target(s >) is either a space-delimited set of targets, each of which is either a literal string or a < perl-block > which returns an array, each of which is either a literal string or a regular expression (Regexp) reference (qr/.../). A literal string can contain a % character to act as a wild-card, just as with GNU make. However, the Regexp feature is more general, since it can capture more than one substring and use the values $!, $2, ... inside the dependencies. Note that only one target can realistically contain wildcards, whether in a Regexp or using %, since there is only one set of $1, $2, ... variables. The colon separating a < perl-block > for < target(s) > must be on the same line as the closing brace of the < perl-block >. < dependencies > is either a space-delimited set of dependency strings or a < perl-block > which returns an array of dependencies (or a combination). The dependency string can contain $1, $2, ..., or %, which is synonymous with $1 and ${TARGET}, which gets the target name. They can also use any scalar global variables previously defined in a < perl-block >. A dependency < perl-block > receives an array @_ with the values ($make, $target, $matches), where $make is a Slay::Maker object, $target is the target name, and $matches is a reference to an array containing the captured values from that targets Regexp (if any). The colon separating a < perl-block > for must be on the same line as the opening brace of the < perl-block >. < actions > is a series of zero or more action "lines", where each action is either a string, which will be executed inside a shell, a perl anonymous array, which is executed without a shell (see IPC::Run), or a < perl-block >. For purposes of this discussion, a "line" continues as long as the lines of string action end with "" or as long as a perl anonymous array or < perl-block > do not have their closing punctuation. A string action can use the strings $1, $2, ..., for the matches, $DEP0, $DEP1, ..., for the dependencies, and $TARGET, which represents the target being built. For make enthusiasts, $* can be used for $1. A string action can also use any scalar global variables previously defined in a < perl-block >. An include line includes the content of a file with < filename > as a SlayMakefile file. If there is no such file, Slay::Makefile will try to build it using rules that have already been presented. If there is no such rule, Slay::Makefile exits with an error unless there was a - before the "include". The equivalent of makes defines are handled by setting perl global variables. Each main < perl-block > is executed in the order it appears in the file, but any that is part of a dependency or action is evaluated lazily, so that all the global variables will have been set. Comments begin with a # and extend to the end of line. Continuation lines can be specified by putting a backslash at the end of the previous line, provided however, that continuation lines are unnecessary (automatic) within a perl block or perl anonymous array. METHODS new Class method. Creates a new Slay::Makefile object. maker Method. Returns the Slay::Maker object used by this Slay::Makefile object. make (@targets) Method. Calls the Slay::Maker objects make method to build the list of targets. If no targets are given, makes the targets of the first rule with constant targets. parse ($filename) Method. Parses file $filename as a SlayMakefile and populates the Slay::Maker object with its rules. Returns a reference to an array of parse errors. parse_string ($string, [$filename, [$lineno]]) Method. Parses $string as a SlayMakefile. If $filename and/or $lineno arguments are provided, they are used for more detailed error reporting. Returns a reference to an array of parse errors..

Requirements: No special requirements
Platforms: Linux
Keyword: Array File Global Variables Libraries Programming Rules Slaymakefile String Target Targets
Users rating: 0/10

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