~macslow/unity/backported-remote-add-to-5.0 : contents of guides/styleguide.xsl at revision 2401

~macslow/unity/backported-remote-add-to-5.0 : (revision 2401)
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:dcq="http://purl.org/dc/qualifiers/1.0/"
xmlns:fo="http://www.w3.org/1999/XSL/Format"
xmlns:fn="http://www.w3.org/2005/xpath-functions">
  <xsl:output method="html"/>
  <!-- Set to 1 to show explanations by default.  Set to 0 to hide them -->
  <xsl:variable name="show_explanation_default" select="0" />
  <!-- The characters within the Webdings font that show the triangles -->
  <xsl:variable name="show_button_text" select="'&#x25B6;'" />
  <xsl:variable name="hide_button_text" select="'&#x25BD;'" />
  <!-- The suffix for names -->
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  <xsl:variable name="body_suffix" select="'__body'"/>
  <!-- For easy reference, the name of the button -->
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  <!-- The top-level element -->
  <xsl:template match="GUIDE">
      <HTML>
          <HEAD>
              <TITLE><xsl:value-of select="@title"/></TITLE>
              <META http-equiv="Content-Type" content="text/html; charset=utf-8"/>
              <LINK HREF="http://www.google.com/favicon.ico" type="image/x-icon"
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              <LINK HREF="styleguide.css"
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          </HEAD>
          <BODY>
            <H1><xsl:value-of select="@title"/></H1>
              <xsl:apply-templates/>
          </BODY>
      </HTML>
  </xsl:template>

  <xsl:template match="OVERVIEW">
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    <DIV style="margin-left: 50%; font-size: 75%;">
      <P>
        Each style point has a summary for which additional information is available
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      <H3>
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        <A>
          <xsl:attribute name="href">?showone=<xsl:value-of select="$stylepoint_name"/>#<xsl:value-of select="$stylepoint_name"/></xsl:attribute>
          link
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  <xsl:template match="SUMMARY">
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  <xsl:template match="DECISION">
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      <DIV style="font-size: 150%;">TODO:
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      <xsl:apply-templates/>
    </I>
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  <!-- This passes through any HTML elements that the
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          <xsl:apply-templates/>
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    <!-- Builds the table of contents -->
  <xsl:template name="TOC">
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          <TD>
          <DIV class="toc_category">
            <A>
              <xsl:attribute name="href">
                <xsl:text>#</xsl:text>
                <xsl:call-template name="anchorname">
                  <xsl:with-param name="sectionname" select="@title"/>
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                  <A>
                    <xsl:attribute name="href">
                      <xsl:text>#</xsl:text>
                      <xsl:call-template name="anchorname">
                        <xsl:with-param name="sectionname" select="@title"/>
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                    <xsl:value-of select="@title"/>
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                <xsl:text> </xsl:text>
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  <xsl:template name="TOC_one_stylepoint">
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  <!-- Creates a standard anchor given any text.
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  <xsl:template name="anchorname">
    <xsl:param name="sectionname"/>
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    <xsl:variable name="bad_characters" select="&quot; ()#'&quot;"/>
    <xsl:value-of select="translate($sectionname,$bad_characters,'_____')"/>
  </xsl:template>

  <!-- Given text, evaluates to the number of leading spaces. -->
  <!-- TODO(csilvers): deal well with leading tabs (treat as 8 spaces?) -->
  <xsl:template name="num_leading_spaces_one_line">
    <xsl:param name="text"/>
    <xsl:param name="current_count"/>
    <xsl:choose>
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  <xsl:template name="num_leading_spaces">
    <xsl:param name="text"/>
    <xsl:param name="max_so_far"/>
    <!-- TODO(csilvers): deal with case text doesn't end in a newline -->
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    <xsl:variable name="rest" select="substring-after($text, '&#xA;')"/>
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            <xsl:with-param name="current_count" select="0"/>
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           <xsl:value-of select="$num_spaces_this_line"/>
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       Used to find the start of code in snippets like:
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       As well as:
       Yes:
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  -->
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    <xsl:param name="text"/>
    <xsl:param name="current_count"/>
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        <xsl:call-template name="code_start_index">
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          <xsl:with-param name="current_count" select="$current_count + 1"/>
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      <xsl:when test="starts-with($text, 'No:')">
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          <xsl:with-param name="current_count" select="$current_count + 3"/>
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      <!-- This is only reached if the first line is entirely whitespace or 
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        <xsl:call-template name="code_start_index">
          <xsl:with-param name="text" select="substring($text, 2)"/>
          <xsl:with-param name="current_count" select="0"/>
        </xsl:call-template>
      </xsl:when>
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        <xsl:value-of select="$current_count"/>
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  <!-- Helper for ends_with_colon. Determine whether the given line is nothing
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    <xsl:choose>
      <xsl:when test="$line = ''">
        <xsl:value-of select="1"/>
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      <xsl:when test="starts-with($line, '&#xA;')">
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      <xsl:when test="starts-with($line, '#')">
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  <!-- Determine whether the given line ends with a colon. Note that Python
       style comments are ignored so the following lines return True:
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       - def foo():  # Bar
       - if(foo):

       But some code may confuse this function. For example the following are
       also consider to "end_with_colon" even though they don't for Python
       - foo(":  #")
       - foo() # No need for :
  -->
  <xsl:template name="ends_with_colon">
    <xsl:param name="line"/>
    <xsl:param name="found_colon"/>
    <xsl:choose>
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        <xsl:value-of select="$found_colon"/>
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        <xsl:call-template name="ends_with_colon">
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      </xsl:when>
      <xsl:when test="starts-with($line, ':')">
        <xsl:variable name="rest_is_comment">
          <xsl:call-template name="is_blank_or_comment">
            <xsl:with-param name="line" select="substring($line, 2)"/>
          </xsl:call-template>
        </xsl:variable>
        <xsl:choose>
          <xsl:when test="$rest_is_comment = '1'">
            <xsl:value-of select="1"/>
          </xsl:when>
          <xsl:otherwise>
            <xsl:call-template name="ends_with_colon">
              <xsl:with-param name="line" select="substring($line, 2)"/>
              <xsl:with-param name="found_colon" select="0"/>
            </xsl:call-template>
          </xsl:otherwise>
        </xsl:choose>
      </xsl:when>
      <xsl:otherwise>
        <xsl:call-template name="ends_with_colon">
          <xsl:with-param name="line" select="substring($line, 2)"/>
          <xsl:with-param name="found_colon" select="0"/>
        </xsl:call-template>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:template>

  <!-- Prints one line of python code with proper indent and calls itself
       recursively for the rest of the text.
       This template uses "a", "b", "c" and "d" to refer to four key column
       numbers. They are:
       - a: the indentation common to all lines in a code snippet. This is
            stripped out to allow for cleaner code in the xml.
       - b: the indentation of the most out-dented line of code. This is
            different from "a" when code is labelled with "Yes:" or "No:"
       - c: the indentation of the current python block, in other words, the
            indentation of the first line of this block, which is the
            indentation of the last line we saw that ended with a colon.
       - d: the "total" indentation of the line, ignorng possible "Yes:" or
            "No:" text on the line.

       For example, for the last line of the following code snippet, the
       positions of a, b, c and d are indicated below:
           Yes: def Foo():
                  if bar():
                    a += 1
                    baz()
           a    b c d

       The algorithm is:
       1) Split the text into first line and the rest. Note that the
          substring-before function is supposed to handle the case where the
          character is not present in the string but does not so we
          automatically ignore the last line of the snippet which is always
          empty (the closing snippet tag). This is consistent with the
          behavior or print_without_leading_chars.
       2) If the current is empty (only whitespace), print newline and call
          itself recursively on the rest of the text with the rest of the
          parameters unchanged.
       3) Otherwise, measure "d"
       4) Measure "c" by taking:
          - the value of "d" if the previous line ended with a colon or the
            current line is outdented compare to the previous line
          - the indent of the previous line otherwise
       5) Print line[a:c] (Note that we ignore line[0:a])
       6) Print line[b:c] in an external span (in order to double the block
          indent in external code).
       7) Print line[c:<end>] with function names processed to produce both 
          internal and external names.
       8) If there are more lines, recurse.
  -->
  <xsl:template name="print_python_line_recursively">
    <xsl:param name="text"/>
    <xsl:param name="a"/>
    <xsl:param name="b"/>
    <xsl:param name="previous_indent"/>
    <xsl:param name="previous_ends_with_colon"/>
    <xsl:param name="is_first_line"/>
    <xsl:variable name="line" select="substring-before($text, '&#xA;')"/>
    <xsl:variable name="rest" select="substring-after($text, '&#xA;')"/>
    <xsl:choose>
      <xsl:when test="substring($line, $b) = '' and not($rest = '')">
        <xsl:if test="not($is_first_line = '1')">
          <xsl:text>&#xA;</xsl:text>
        </xsl:if>
        <xsl:call-template name="print_python_line_recursively">
          <xsl:with-param name="text" select="$rest"/>
          <xsl:with-param name="a" select="$a"/>
          <xsl:with-param name="b" select="$b"/>
          <xsl:with-param name="previous_indent" select="$previous_indent"/>
          <xsl:with-param name="previous_ends_with_colon"
                          select="$previous_ends_with_colon"/>
          <xsl:with-param name="is_first_line" select="0"/>
        </xsl:call-template>
      </xsl:when>
      <xsl:otherwise>
        <xsl:variable name="indent_after_b">
          <xsl:call-template name="num_leading_spaces_one_line">
            <xsl:with-param name="text" select="substring($line, $b + 1)"/>
            <xsl:with-param name="current_count" select="0"/>
          </xsl:call-template>
        </xsl:variable>
        <xsl:variable name="d" select="$b + $indent_after_b"/>
        <xsl:variable name="c">
           <xsl:choose>
             <xsl:when test="$previous_ends_with_colon = '1' or
                             $previous_indent > $d">
               <xsl:value-of select="$d"/>
             </xsl:when>
             <xsl:otherwise>
               <xsl:value-of select="$previous_indent"/>
             </xsl:otherwise>
           </xsl:choose>
        </xsl:variable>

        <xsl:value-of select="substring($line, $a + 1, $c - $a)"/>
        <span class="external">
           <xsl:value-of select="substring($line, $b + 1, $c - $b)"/>
        </span>
        <xsl:call-template name="munge_function_names_in_text">
          <xsl:with-param name="stripped_line"
             select="substring($line, $c + 1)"/>
        </xsl:call-template>
        <xsl:if test="not(substring($rest, $a) = '')">
          <xsl:text>&#xA;</xsl:text>
          <xsl:call-template name="print_python_line_recursively">
            <xsl:with-param name="text" select="$rest"/>
            <xsl:with-param name="a" select="$a"/>
            <xsl:with-param name="b" select="$b"/>
            <xsl:with-param name="previous_indent" select="$c"/>
            <xsl:with-param name="previous_ends_with_colon">
              <xsl:call-template name="ends_with_colon">
                <xsl:with-param name="line" select="$line"/>
                <xsl:with-param name="found_colon" select="0"/>
              </xsl:call-template>
            </xsl:with-param>
            <xsl:with-param name="is_first_line" select="0"/>
          </xsl:call-template>
        </xsl:if>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:template>

  <!-- Print python code with internal and external styles.
       In order to conform with PEP-8 externally, we identify 2-space indents
       and an external-only 4-space indent.
       Function names that are marked with $$FunctionName/$$ have an external
       lower_with_underscore version added. -->
  <xsl:template name="print_python_code">
    <xsl:param name="text"/>

    <xsl:variable name="a">
       <xsl:call-template name="num_leading_spaces">
         <xsl:with-param name="text" select="."/>
         <xsl:with-param name="max_so_far" select="1000"/>
       </xsl:call-template>
    </xsl:variable>

    <xsl:variable name="b">
      <xsl:call-template name="code_start_index">
        <xsl:with-param name="text" select="$text"/>
        <xsl:with-param name="current_count" select="0"/>
      </xsl:call-template>
    </xsl:variable>

    <xsl:call-template name="print_python_line_recursively">
      <xsl:with-param name="text" select="$text"/>
      <xsl:with-param name="a" select="$a"/>
      <xsl:with-param name="b" select="$b"/>
      <xsl:with-param name="previous_indent" select="$b"/>
      <xsl:with-param name="previous_ends_with_colon" select="0"/>
      <xsl:with-param name="is_first_line" select="1"/> 
    </xsl:call-template>
  </xsl:template>

  <!-- Given a block of text, each line terminated by \n, and a number n,
       emits the text with the first n characters of each line
       deleted.  If strip==1, then we omit blank lines at the beginning
       and end of the text (but not the middle!) -->
  <!-- TODO(csilvers): deal well with leading tabs (treat as 8 spaces?) -->
  <xsl:template name="print_without_leading_chars">
    <xsl:param name="text"/>
    <xsl:param name="trim_count"/>
    <xsl:param name="strip"/>
    <xsl:param name="is_firstline"/>
    <!-- TODO(csilvers): deal with case text doesn't end in a newline -->
    <xsl:variable name="line" select="substring-before($text, '&#xA;')"/>
    <xsl:variable name="rest" select="substring-after($text, '&#xA;')"/>
    <xsl:variable name="stripped_line" select="substring($line, $trim_count+1)"/>
    <xsl:choose>
      <!-- $line (or $rest) is considered empty if we'd trim the entire line -->
      <xsl:when test="($strip = '1') and ($is_firstline = '1') and
                      (string-length($line) &lt;= $trim_count)">
      </xsl:when>
      <xsl:when test="($strip = '1') and
                      (string-length($rest) &lt;= $trim_count)">
        <xsl:value-of select="$stripped_line"/>
      </xsl:when>
      <xsl:otherwise>
        <xsl:value-of select="$stripped_line"/>
        <xsl:text>&#xA;</xsl:text>
      </xsl:otherwise>
    </xsl:choose>
    <xsl:if test="not($rest='')">
      <xsl:call-template name="print_without_leading_chars">
        <xsl:with-param name="text" select="$rest"/>
        <xsl:with-param name="trim_count" select="$trim_count"/>
        <xsl:with-param name="strip" select="$strip"/>
        <xsl:with-param name="is_firstline" select="0"/>
      </xsl:call-template>
    </xsl:if>
  </xsl:template>

  <!-- Given a line of code, find function names that are marked with $$ /$$ and
       print out the line with the internal and external versions of the
       function names.-->
  <xsl:template name="munge_function_names_in_text">
    <xsl:param name="stripped_line"/>
    <xsl:choose>
      <xsl:when test="contains($stripped_line, '$$')">
        <xsl:value-of select="substring-before($stripped_line, '$$')"/>
        <xsl:call-template name="print_function_name">
          <xsl:with-param name="text" select="substring-after(substring-before($stripped_line, '/$$'), '$$')"/>
        </xsl:call-template>
        <xsl:call-template name="munge_function_names_in_text">
          <xsl:with-param name="stripped_line" select="substring-after($stripped_line, '/$$')"/>
        </xsl:call-template>
      </xsl:when>
      <xsl:otherwise>
        <xsl:value-of select="$stripped_line"/>
     </xsl:otherwise>
   </xsl:choose>
  </xsl:template>

  <!-- Given a function name, print out both the internal and external version
       of the function name in their respective spans.-->
  <xsl:template name="print_function_name">
    <xsl:param name="text"/>
      <xsl:call-template name="convert_camel_case_to_lowercase_with_under">
        <xsl:with-param name="text" select="$text"/>
      </xsl:call-template>
  </xsl:template>

  <!-- Given a single word of text convert it from CamelCase to
       lower_with_under.
       This means replacing each uppercase character with _ followed by the
       lowercase version except for the first character which is replaced 
       without adding the _.-->
  <xsl:template name="convert_camel_case_to_lowercase_with_under">
    <xsl:param name="text"/>
    <xsl:param name="is_recursive_call"/>
    <xsl:variable name="first_char" select="substring($text, 1, 1)"/>
    <xsl:variable name="rest" select="substring($text, 2)"/>
    <xsl:choose>
      <xsl:when test="contains('ABCDEFGHIJKLMNOPQRSTUVWXYZ', $first_char)">
        <xsl:if test="$is_recursive_call='1'">
           <xsl:text>_</xsl:text>
        </xsl:if>
        <xsl:value-of select="translate($first_char, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz')"/>
      </xsl:when>
      <xsl:otherwise>
        <xsl:value-of select="$first_char" />
      </xsl:otherwise>
    </xsl:choose>
    <xsl:if test="not($rest='')">
      <xsl:call-template name="convert_camel_case_to_lowercase_with_under">
        <xsl:with-param name="text" select="$rest"/>
        <xsl:with-param name="is_recursive_call" select="1"/>
      </xsl:call-template>
    </xsl:if>
  </xsl:template>
</xsl:stylesheet>