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Template processor
A template processor (also known as a template engine or template parser) is software designed to combine templates with data (defined by a data model) to produce resulting documents or programs. The language that the templates are written in is known as a template language or templating language. For purposes of this article, a result document is any kind of formatted output, including documents, web pages, or source code (in source code generation), either in whole or in fragments. A template engine is ordinarily included as a part of a web template system or application framework, and may be used also as a preprocessor or filter.
Template engines typically include features common to most high-level programming languages, with an emphasis on features for processing plain text.
Such features include:
While template processors are typically a separate piece of software, used as part of a system or framework, simple templating languages are commonly included in the string processing features of general-purpose programming languages, and in text processing programs, notably text editors or word processors. The templating languages are generally simple substitution-only languages, in contrast to the more sophisticated facilities in full-blown template processors, but may contain some logic.
Simple examples include ‘printf’ print format strings, found in many programming languages, and snippets, found in a number of text editors and source code editors. In word processors, templates are a common feature, while automatic filling in of the templates is often referred to as mail merge.
An illustrative example of the complementary nature of parsing and templating is the s (substitute) command in the sed text processor, originating from search-and-replace in the ed text editor. Substitution commands are of the form s/regexp/replacement/, where regexp is a regular expression, for parsing input, and replacement is a simple template for output, either literal text, or a format string containing the characters & for "entire match" or the special escape sequences \1 through \9 for the nth sub-expression. For example, s/(cat|dog)s?/\1s/g replaces all occurrences of "cat" or "dog" with "cats" or "dogs", without duplicating an existing "s": (cat|dog) is the 1st (and only) sub-expression in the regexp, and \1 in the format string substitutes this into the output.
All template processing systems consist of at least these primary elements:
This may be a relational database, a source file such as XML, an alternate format of flat file database, a spreadsheet or any of other various sources of preformatted data. Some template processing systems are limited in the types of data that can be used. Others are designed for maximum flexibility and allow many different types of data.
Hub AI
Template processor AI simulator
(@Template processor_simulator)
Template processor
A template processor (also known as a template engine or template parser) is software designed to combine templates with data (defined by a data model) to produce resulting documents or programs. The language that the templates are written in is known as a template language or templating language. For purposes of this article, a result document is any kind of formatted output, including documents, web pages, or source code (in source code generation), either in whole or in fragments. A template engine is ordinarily included as a part of a web template system or application framework, and may be used also as a preprocessor or filter.
Template engines typically include features common to most high-level programming languages, with an emphasis on features for processing plain text.
Such features include:
While template processors are typically a separate piece of software, used as part of a system or framework, simple templating languages are commonly included in the string processing features of general-purpose programming languages, and in text processing programs, notably text editors or word processors. The templating languages are generally simple substitution-only languages, in contrast to the more sophisticated facilities in full-blown template processors, but may contain some logic.
Simple examples include ‘printf’ print format strings, found in many programming languages, and snippets, found in a number of text editors and source code editors. In word processors, templates are a common feature, while automatic filling in of the templates is often referred to as mail merge.
An illustrative example of the complementary nature of parsing and templating is the s (substitute) command in the sed text processor, originating from search-and-replace in the ed text editor. Substitution commands are of the form s/regexp/replacement/, where regexp is a regular expression, for parsing input, and replacement is a simple template for output, either literal text, or a format string containing the characters & for "entire match" or the special escape sequences \1 through \9 for the nth sub-expression. For example, s/(cat|dog)s?/\1s/g replaces all occurrences of "cat" or "dog" with "cats" or "dogs", without duplicating an existing "s": (cat|dog) is the 1st (and only) sub-expression in the regexp, and \1 in the format string substitutes this into the output.
All template processing systems consist of at least these primary elements:
This may be a relational database, a source file such as XML, an alternate format of flat file database, a spreadsheet or any of other various sources of preformatted data. Some template processing systems are limited in the types of data that can be used. Others are designed for maximum flexibility and allow many different types of data.