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| − | {{formats}}
| + | #REDIRECT [[EPScript/Introduction]] |
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| − | This is an introduction.
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| − | = Data Types =
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| − | EPScript allows for two primitive data types (string and integer) as well as providing the means to access properties of data objects such as EPrints or Users. | |
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| − | == Primitive Types ==
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| − | === Strings and characters ===
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| − | These are contained within either double quotes ("") or single quotes (<nowiki>''</nowiki>). There is no difference between the two, but it may be easier to use one sort when inside an XML attribute. For example:
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| − | <when test="type = 'patent'">
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| − | ...
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| − | </when>
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| − | | |
| − | === Integers ===
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| − | Integers are defined as a string of numbers from 0-9, e.g. 300. Leading zeros do not have any effect, and decimal values are currently not supported.
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| − | | |
| − | == Data Objects ==
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| − | Data Objects include most of the key EPrints objects - whether an EPrint itself, documents related to the EPrint, or a user. EPScript treats all of these data objects the same, with a simple approach to retrieve properties. When an EPScript is executed, an 'item' object is supplied. In the case of a citation file, this will be the item for which the citation is being created. For a workflow, this will be the object on which the workflow acts (e.g. an EPrint or a user). Properties of main objects can be accessed using a shortened approach - the following example is from a user workflow, so the usertype property is available:
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| − | <if test="usertype = 'editor'">
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| − | ...
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| − | </if>
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| − | There are cases, however, where two or more data objects may be provided - such as an EPrint and a user. Here the main item can still be accessed in the short form, but other objects use a dollar notation. In this example, the EPrint is available as $eprint:
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| − | <if test="$eprint.ispublished.one_of('unpub', 'submitted', 'inpress')"> (<print expr="$eprint.ispublished" />)</if>
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| − | = Operators =
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| − | ==Logical Operators==
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| − | ===and===
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| − | Returns true if both the left-hand and the right-hand expressions return true.
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| − | <if test="type = 'book' and is_set( creators )">
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| − | ...
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| − | </if>
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| − | | |
| − | ===or===
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| − | Returns true if at least one of the expressions returns true.
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| − | <if test="type = 'book' or type = 'patent'">
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| − | ...
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| − | </if>
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| − | | |
| − | ===not===
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| − | Returns true if the expression is false and false if the expression is true.
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| − | <if test="!is_set( creators )">
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| − | ...
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| − | </if>
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| − | | |
| − | ==Comparison Operators==
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| − | ===lt===
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| − | Returns true if the left-hand expression is less than the right-hand expression. This is only applicable to expressions that return numeric values.
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| − | <if test="length(editors) lt 6">
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| − | ...
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| − | </if>
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| − | ===gt===
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| − | Returns true if the left-hand expression is greater than the right-hand expression. This is only applicable to expressions that return numeric values.
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| − | | |
| − | <if test="length(editors) gt 1">
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| − | ...
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| − | </if>
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| − | ===equals===
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| − | Returns true if the left-hand expression is equal to the right-hand expression. This applies to numeric, boolean, and string values.
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| − | | |
| − | <if test="type = 'patent'">
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| − | ...
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| − | </if>
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| − | ===not equals===
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| − | The inverse of the equals operator, this returns true if the expressions are not equal.
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| − | <if test="type != 'book'">
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| − | ...
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| − | </if>
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| − | = Functions =
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| − | == Calling Functions ==
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| − | Functions can be called in two ways:
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| − | <when test="is_set( creators )">
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| − | or
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| − | <when test="creators.is_set">
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| − | These are interchangable, but it may be beneficial to use a specific form in some cases.
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| − | | |
| − | == Generic Functions ==
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| − | === is_set ===
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| − | Returns true if the parameter is set, based on the following criteria:
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| − | * If the parameter is a string, it is set if it is not empty.
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| − | * If the parameter is a list or a complex structure, it is set if at least one value is set.
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| − | | |
| − | <when test="is_set( creators )">
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| − | ...
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| − | </when>
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| − | == List Functions ==
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| − | === length ===
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| − | Returns the number of items in the list.
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| − | <if test="length(editors) gt 1">s</if>
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| − | == String Functions ==
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| − | === one_of ===
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| − | Returns true if the string is in the list of strings provided.
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| − | <when test="type.one_of( 'book','book_section' )">
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| − | ...
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| − | </when>
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| − | === reverse ===
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| − | Returns the reverse of a string (i.e. 'abc' becomes 'cba').
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| − | <when test="type.reverse = 'tnetap'">
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| − | ...
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| − | </when>
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| − | = Examples =
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| − | Pluralising the editors of a book:
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| − | <if test="type = 'book' and is_set(editors)">
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| − | <print expr="editors" />, (ed<if test="length(editors) gt 1">s</if>
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| − | </if>
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