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Stencil templating system
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<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<properties>
  <!-- Standard sub patterns -->
  <entry key="!ID_CHARS!">
    # Match unicode regular expression "word" characters, currency symbols, period and solidus
    [ \w \p{Sc} . / ]+
  </entry>

  <entry key="!SEPARATOR!">
    # Separator which matches comma, or whitespace.
    # The final whitespace is greedy as that is required for a following negative assertion.
    (?: \s* , \s*+ )
  </entry>

  <entry key="!ID!">
    # Capturing group which matches a collection of ID characters.
    ( !ID_CHARS! )
  </entry>

  <entry key="!FLAGS!">
    # Optional processing flags, which is a separated list of IDs followed by a ':'
    (?:
    (
    !ID_CHARS!
    (?:
    !SEPARATOR!
    !ID_CHARS!
    )*
    )?
    \s* : \s*
    )?
  </entry>

  <entry key="!LITERAL!">
    (?: ' (?: [^'] | '' )* ' )
  </entry>

  <entry key="!APPLY_FIRST_ARGUMENT!">
    (?: (?: !ID_CHARS! ) | !LITERAL! )?
  </entry>

  <entry key="!APPLY_NEXT_ARGUMENT!">
    (?: !SEPARATOR! (?: (?: !ID_CHARS! ) | !LITERAL! )? )
  </entry>

  <entry key="!MARKER!"><![CDATA[
    # Marker for "here" documents. Any visible character except for '{', '}', '<', '>', '[', and ']'.
    (?<marker>
      [
        \p{Graph}
        && [^ {}<>\[\] ]
      ] +
    )
  ]]>
  </entry>

  <entry key="!SETTING!">
    # Match and ID=ID setting.
    !ID_CHARS! \s* = \s* !ID_CHARS!
  </entry>

  <!-- Pattern to capture the values given in a setting. -->
  <entry key="SETTING_VALUES">
    (!ID_CHARS!) \s* = \s* (!ID_CHARS!)
  </entry>

  <entry key="!STYLE!">
    short | medium | long | full
  </entry>

  <!-- Block definitions -->

  <!-- Apply a function, with optional arguments, to the current data. -->
  <!-- [apply f(a1,a2)] -->
  <entry key="APPLY">
    \[ \s*
    apply \s+
    # Optional output parameter
    (?: !ID! \s* = \s* )?
    # function name
    !ID!
    # Optional arguments enclosed in parentheses.
    (?:
    \s* \( \s*
      (
        !APPLY_FIRST_ARGUMENT!
        !APPLY_NEXT_ARGUMENT! *
      ) \s*
    \)
    )?
    \s* \]
  </entry>

  <!-- A comment, styled after the common symbols-star pattern -->
  <!-- [* this is a comment *] -->
  <entry key="COMMENT">
    \[ \s*
    \* .*? \*
    \s* \]
  </entry>


  <!-- A comment, styled after the common symbols-star pattern -->
  <!-- [* this is a comment *] -->
  <entry key="VALUE_COMMENT">
    \{ \s*
    \* .*? \*
    \s* \}
  </entry>

  <!-- An 'else' directive -->
  <!-- [else] -->
  <entry key="ELSE">
    \[ \s*
    else
    \s* \]
  </entry>

  <!-- An 'end' directive -->
  <!-- [else] -->
  <entry key="END">
    \[ \s*
    end
    \s* \]
  </entry>

  <!-- A "here" document. -->
  <!-- {>> marker} this is a document {marker} -->
  <entry key="VALUE_HERE"><![CDATA[
    \{ \s*
      !FLAGS!
      >> \s*
      !MARKER!
    \s* \}

    # The here document contents
    (?<document> .*? )

    # Here document terminal
    \{ \s*
      (?-i: \k<marker> )
    \s* \}
  ]]>
  </entry>

  <!-- An "if" directive. -->
  <!-- [if flagIsTrue] [else] [end] -->
  <entry key="IF">
    \[ \s*
    if \s+ !ID!
    \s* \]
  </entry>

  <!-- Include another template. -->
  <!-- [ Include my/template/which/does/stuff.txt ] -->
  <entry key="INCLUDE">
    \[ \s*
    include \s+
    # Path is any character except '{', '}', '[', ']', '&lt;', '&gt;', ':', ';', and '\'
    ( [^ { } \[ \] &lt; &gt; : ; \\ ]+? )
    \s* \]
  </entry>

  <!-- Loop over a collection or array -->
  <!-- [ loop datum ] ... [else] ... [end] -->
  <entry key="LOOP">
    \[ \s*
    loop \s+ !ID!
    \s* \]
  </entry>

  <!-- Include a template from the default resource bundle. -->
  <!-- [{ message }] -->
  <entry key="RESOURCE_1">
    \[ \s* \{ \s*
    !ID!
    \s* \} \s* \]
  </entry>


  <!-- Include a template from the specified resource bundle. -->
  <!-- [{ bundle, message }] -->
  <entry key="RESOURCE_2">
    \[ \s* \{ \s*
    # The resource bundle
    !ID!
    !SEPARATOR!
    # The resource
    !ID!
    \s* \} \s* \]
  </entry>

  <!-- Set some properties -->
  <!-- [set escape=no_escape, bundle = new_bundle] -->
  <entry key="SET">
    \[ \s*
    set (?: \s+
    (
    !SETTING!
    (?:
    !SEPARATOR!
    !SETTING!
    )*
    )
    )?
    \s* \]
  </entry>

  <!-- A use directive -->
  <!-- [use datum] -->
  <entry key="USE">
    \[ \s*
    use \s+ !ID!
    \s* \]
  </entry>

  <!-- basic value -->
  <!-- {value -->
  <entry key="VALUE">
    \{ \s*
    !FLAGS!
    !ID!
    \s* \}
  </entry>

  <entry key="VALUE_DATE">
    \{ \s*
    !FLAGS!
    !ID!
    !SEPARATOR!
    date
    (?:
    !SEPARATOR!
    # Not a here document
    (?!>>)
    (.*?)
    )?
    \s* \}
  </entry>

  <entry key="VALUE_TIME">
    \{ \s*
    !FLAGS!
    !ID!
    !SEPARATOR!
    time
    (?:
    !SEPARATOR!
    # Not a here document
    (?!>>)
    (.*?)
    )?
    \s* \}
  </entry>

  <entry key="VALUE_DATE_TIME">
    \{ \s*
    !FLAGS!
    !ID!
    !SEPARATOR!
    datetime
    (?:
    !SEPARATOR!
    # Not a here document
    (?!>>)
    # Not a datetime with 2 arguments.
    (?!
    (?: !STYLE! )
    !SEPARATOR!
    (?: !STYLE! )
    )
    # The format specifier
    (.*)
    )?
    \s* \}
  </entry>

  <entry key="VALUE_DATE_TIME_2">
    \{ \s*
    !FLAGS!
    !ID!
    !SEPARATOR!
    datetime
    !SEPARATOR!
    ( !STYLE! )
    !SEPARATOR!
    ( !STYLE! )
    \s* \}
  </entry>

  <entry key="VALUE_DATE_TIME_HERE"><![CDATA[
    \{ \s*
      !FLAGS!
      !ID!
      !SEPARATOR!
      (?: date | time | datetime )
      !SEPARATOR!
      >> \s*
      !MARKER!
    \s* \}
    (.*?)
    \{ \s*
      (?-i: \k<marker> )
    \s* \}
  ]]>
  </entry>

  <entry key="VALUE_FORMAT">
    \{ \s*
    !FLAGS!
    !ID!
    !SEPARATOR!
    format
    !SEPARATOR!
    # Not a here document
    (?!>>)
    (.*?)
    \s* \}
  </entry>

  <entry key="VALUE_FORMAT_HERE"><![CDATA[
    \{ \s*
      !FLAGS!
      !ID!
      !SEPARATOR!
      format
      !SEPARATOR!
      >> \s*
      !MARKER!
    \s* \}
    (.*?)
    \{ \s*
      (?-i: \k<marker> )
    \s* \}
  ]]>
  </entry>

  <entry key="VALUE_NUMBER">
    \{ \s*
    !FLAGS!
    !ID!
    !SEPARATOR!
    number
    # Optional format
    (?:
    !SEPARATOR!
    # Not a here document
    (?!>>)
    (.*?)
    )?
    \s* \}
  </entry>

  <entry key="VALUE_NUMBER_HERE"><![CDATA[
    \{ \s*
      !FLAGS!
      !ID!
      !SEPARATOR!
      number
      !SEPARATOR!
      >> \s*
      !MARKER!
    \s* \}
    (.*?)
    \{ \s*
      (?-i: \k<marker> )
    \s* \}
  ]]>
  </entry>

</properties>