NAME
Language::Expr::Compiler::Base - Base class for Expr compilers
VERSION
This document describes version 0.29 of Language::Expr::Compiler::Base (from Perl distribution Language-Expr), released on 2016-07-03.
ATTRIBUTES
markers => ARRAYREF
Used to mark compile output string with various unique strings, and later on revisit these markers and substitute for other, final values. This technique is kind of a hack, used for subexpression, inserting PHP use() statement (because they must be processed outward to inward), etc.
func_mapping => HASHREF
Map Expr function to target language's function/method/property.
hook_var
Can be set to a coderef that will be called during parsing whenever variable is encountered. The coderef is called with variable name as argument, and expected to return target language code to handle the variable. By default, if this attribute is not set, variable in expression is returned as is (e.g. '$foo' becomes '$foo' in Perl), which means some will result in error (e.g. '${name that contains some symbols that makes it invalid Perl}').
If the coderef returns undef, the default behaviour is used.
Note that due to current limitation of Perl regex and/or Regexp::Grammars, you cannot use any regex in your hook_var.
hook_func
Can be set to a coderef that will be called during parsing whenever a function call is encountered. The coderef is called as its arguments function name and list of arguments and expected to return target language code to handle the function call. By default, if this attribute is not set, variable in expression is returned as is (e.g. 'foo(1, 2, 3)' becomes 'foo(1, 2, 3)' in Perl).
If the coderef returns undef, the default behaviour is used.
Note that due to current limitation of Perl regex and/or Regexp::Grammars, you cannot use any regex in your hook_var.
METHODS
new_marker(TYPE[, DATA]) => UUID
Create a new marker. Return a unique ID to be placed in compiled output.
marker_ids() => ARRAY
Return an array of all marker IDs.
marker_ids_re() => STRING
Return a regex that matches marker IDs.
HOMEPAGE
Please visit the project's homepage at https://metacpan.org/release/Language-Expr.
SOURCE
Source repository is at https://github.com/sharyanto/perl-Language-Expr.
BUGS
Please report any bugs or feature requests on the bugtracker website https://rt.cpan.org/Public/Dist/Display.html?Name=Language-Expr
When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.
AUTHOR
perlancar <perlancar@cpan.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2016 by perlancar@cpan.org.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.