我正在尝试更改内联元素的前景色和背景色。文档手册片段是这样的：
<command role=" f00 b01 ">Lorem Ipsum</command>
我的自定义层中的 XSL 部分是这样的：
[...]
<xsl:template match='db:command[contains(@role, " f00 ")]'>
<fo:inline color='#000000'><xsl:apply-templates/></fo:inline>
</xsl:template>
<xsl:template match='db:command[contains(@role, " b00 ")]'>
<fo:inline background-color='#000000'><xsl:apply-templates/></fo:inline>
</xsl:template>
[255 x 6 more lines, for each fXX and bXX where X is a hex digit
and the colors are the 256 xterm RGB color specs.]
这只会更改背景色或前景色，具体取决于最后一个模板。
当角色值f00 b01时，如何同时应用前台和后台？注意：像contains " f00 b01 "那样进行第三次测试不是一个选项，因为有 256 种颜色可供选择，并且指定所有组合会使模板数量爆炸。
注意：经过编辑以更紧密地匹配实际文件内容
xterm 颜色到 rgb 颜色的映射如下所示。从颜色 16 开始，它们可以用一个小的 perl 脚本（片段取自 xterm distruibution）计算：
# colors 16-231 are a 6x6x6 color cube
for ($red = 0; $red < 6; $red++) {
for ($green = 0; $green < 6; $green++) {
for ($blue = 0; $blue < 6; $blue++) {
$code = 16 + ($red * 36) + ($green * 6) + $blue;
printf($line1, $code);
printf($line2, $code);
printf($line3,
($red ? ($red * 40 + 55) : 0),
($green ? ($green * 40 + 55) : 0),
($blue ? ($blue * 40 + 55) : 0));
}
}
}
# colors 232-255 are a grayscale ramp, intentionally leaving out
# black and white
$code=232;
for ($gray = 0; $gray < 24; $gray++) {
$level = ($gray * 10) + 8;
$code = 232 + $gray;
printf($line1, $code);
printf($line2, $code);
printf($line3,
$level, $level, $level);
}
结果：
00 #000000 80 #af00d7
01 #cd0000 81 #af00ff
02 #00cd00 82 #af5f00
03 #cdcd00 83 #af5f5f
04 #0000ee 84 #af5f87
05 #cd00cd 85 #af5faf
06 #00cdcd 86 #af5fd7
07 #e5e5e5 87 #af5fff
08 #7f7f7f 88 #af8700
09 #ff0000 89 #af875f
0a #00ff00 8a #af8787
0b #ffff00 8b #af87af
0c #5c5cff 8c #af87d7
0d #ff00ff 8d #af87ff
0e #00ffff 8e #afaf00
0f #ffffff 8f #afaf5f
10 #000000 90 #afaf87
11 #00005f 91 #afafaf
12 #000087 92 #afafd7
13 #0000af 93 #afafff
14 #0000d7 94 #afd700
15 #0000ff 95 #afd75f
16 #005f00 96 #afd787
17 #005f5f 97 #afd7af
18 #005f87 98 #afd7d7
19 #005faf 99 #afd7ff
1a #005fd7 9a #afff00
1b #005fff 9b #afff5f
1c #008700 9c #afff87
1d #00875f 9d #afffaf
1e #008787 9e #afffd7
1f #0087af 9f #afffff
20 #0087d7 a0 #d70000
21 #0087ff a1 #d7005f
22 #00af00 a2 #d70087
23 #00af5f a3 #d700af
24 #00af87 a4 #d700d7
25 #00afaf a5 #d700ff
26 #00afd7 a6 #d75f00
27 #00afff a7 #d75f5f
28 #00d700 a8 #d75f87
29 #00d75f a9 #d75faf
2a #00d787 aa #d75fd7
2b #00d7af ab #d75fff
2c #00d7d7 ac #d78700
2d #00d7ff ad #d7875f
2e #00ff00 ae #d78787
2f #00ff5f af #d787af
30 #00ff87 b0 #d787d7
31 #00ffaf b1 #d787ff
32 #00ffd7 b2 #d7af00
33 #00ffff b3 #d7af5f
34 #5f0000 b4 #d7af87
35 #5f005f b5 #d7afaf
36 #5f0087 b6 #d7afd7
37 #5f00af b7 #d7afff
38 #5f00d7 b8 #d7d700
39 #5f00ff b9 #d7d75f
3a #5f5f00 ba #d7d787
3b #5f5f5f bb #d7d7af
3c #5f5f87 bc #d7d7d7
3d #5f5faf bd #d7d7ff
3e #5f5fd7 be #d7ff00
3f #5f5fff bf #d7ff5f
40 #5f8700 c0 #d7ff87
41 #5f875f c1 #d7ffaf
42 #5f8787 c2 #d7ffd7
43 #5f87af c3 #d7ffff
44 #5f87d7 c4 #ff0000
45 #5f87ff c5 #ff005f
46 #5faf00 c6 #ff0087
47 #5faf5f c7 #ff00af
48 #5faf87 c8 #ff00d7
49 #5fafaf c9 #ff00ff
4a #5fafd7 ca #ff5f00
4b #5fafff cb #ff5f5f
4c #5fd700 cc #ff5f87
4d #5fd75f cd #ff5faf
4e #5fd787 ce #ff5fd7
4f #5fd7af cf #ff5fff
50 #5fd7d7 d0 #ff8700
51 #5fd7ff d1 #ff875f
52 #5fff00 d2 #ff8787
53 #5fff5f d3 #ff87af
54 #5fff87 d4 #ff87d7
55 #5fffaf d5 #ff87ff
56 #5fffd7 d6 #ffaf00
57 #5fffff d7 #ffaf5f
58 #870000 d8 #ffaf87
59 #87005f d9 #ffafaf
5a #870087 da #ffafd7
5b #8700af db #ffafff
5c #8700d7 dc #ffd700
5d #8700ff dd #ffd75f
5e #875f00 de #ffd787
5f #875f5f df #ffd7af
60 #875f87 e0 #ffd7d7
61 #875faf e1 #ffd7ff
62 #875fd7 e2 #ffff00
63 #875fff e3 #ffff5f
64 #878700 e4 #ffff87
65 #87875f e5 #ffffaf
66 #878787 e6 #ffffd7
67 #8787af e7 #ffffff
68 #8787d7 e8 #080808
69 #8787ff e9 #121212
6a #87af00 ea #1c1c1c
6b #87af5f eb #262626
6c #87af87 ec #303030
6d #87afaf ed #3a3a3a
6e #87afd7 ee #444444
6f #87afff ef #4e4e4e
70 #87d700 f0 #585858
71 #87d75f f1 #626262
72 #87d787 f2 #6c6c6c
73 #87d7af f3 #767676
74 #87d7d7 f4 #808080
75 #87d7ff f5 #8a8a8a
76 #87ff00 f6 #949494
77 #87ff5f f7 #9e9e9e
78 #87ff87 f8 #a8a8a8
79 #87ffaf f9 #b2b2b2
7a #87ffd7 fa #bcbcbc
7b #87ffff fb #c6c6c6
7c #af0000 fc #d0d0d0
7d #af005f fd #dadada
7e #af0087 fe #e4e4e4
7f #af00af ff #eeeeee
首先也是最重要的：如果您是源文档的作者，则应为每个...好吧，属性 - 并省去使用笨拙的字符串操作提取单个值的痛苦。这就是XML的全部意义所在。
接下来，使用 2 x 256 模板的想法是荒谬的。您只需要提取表示 xterm 颜色的两个十六进制数字代码并将它们转换为 #rrggb 格式。
尽管如此，提取过程（如果属性分离，则根本不需要）并不那么困难。鉴于：
<command role=" f00 b01 ">Lorem Ipsum</command>
您可以使用：
<xsl:template match="command">
<xsl:variable name="fg" select="substring-before(substring-after(@role, ' f'), ' ')" />
<xsl:variable name="bg" select="substring-before(substring-after(@role, ' b'), ' ')" />
<!-- -->
</xsl:template>
现在，您只需要将提取的xterm代码转换为rgb。你一开始没有说这些代码是如何得出的。我怀疑这可以反向计算，但如果这不可能或不方便，请使用外部 XML 文档（或内部变量）来查找它。
下面是从内部变量查找的示例：
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:exsl="http://exslt.org/common"
extension-element-prefixes="exsl">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:template match="command">
<xsl:variable name="fg" select="substring-before(substring-after(@role, ' f'), ' ')" />
<xsl:variable name="bg" select="substring-before(substring-after(@role, ' b'), ' ')" />
<xsl:variable name="color-set" select="exsl:node-set($colors)/color" />
<xsl:variable name="color" select="$color-set[@code=$fg]" />
<xsl:variable name="background-color" select="$color-set[@code=$bg]" />
<!-- -->
</xsl:template>
<xsl:variable name="colors">
<color code="00">#000000</color>
<color code="01">#cd0000</color>
<color code="02">#00cd00</color>
<color code="03">#cdcd00</color>
<color code="04">#0000ee</color>
<color code="05">#cd00cd</color>
<color code="06">#00cdcd</color>
<color code="07">#e5e5e5</color>
<color code="08">#7f7f7f</color>
<color code="09">#ff0000</color>
<color code="0a">#00ff00</color>
<color code="0b">#ffff00</color>
<color code="0c">#5c5cff</color>
<color code="0d">#ff00ff</color>
<color code="0e">#00ffff</color>
<color code="0f">#ffffff</color>
<color code="10">#000000</color>
<color code="11">#00005f</color>
<color code="12">#000087</color>
<color code="13">#0000af</color>
<color code="14">#0000d7</color>
<color code="15">#0000ff</color>
<color code="16">#005f00</color>
<color code="17">#005f5f</color>
<color code="18">#005f87</color>
<color code="19">#005faf</color>
<color code="1a">#005fd7</color>
<color code="1b">#005fff</color>
<color code="1c">#008700</color>
<color code="1d">#00875f</color>
<color code="1e">#008787</color>
<color code="1f">#0087af</color>
<color code="20">#0087d7</color>
<color code="21">#0087ff</color>
<color code="22">#00af00</color>
<color code="23">#00af5f</color>
<color code="24">#00af87</color>
<color code="25">#00afaf</color>
<color code="26">#00afd7</color>
<color code="27">#00afff</color>
<color code="28">#00d700</color>
<color code="29">#00d75f</color>
<color code="2a">#00d787</color>
<color code="2b">#00d7af</color>
<color code="2c">#00d7d7</color>
<color code="2d">#00d7ff</color>
<color code="2e">#00ff00</color>
<color code="2f">#00ff5f</color>
<color code="30">#00ff87</color>
<color code="31">#00ffaf</color>
<color code="32">#00ffd7</color>
<color code="33">#00ffff</color>
<color code="34">#5f0000</color>
<color code="35">#5f005f</color>
<color code="36">#5f0087</color>
<color code="37">#5f00af</color>
<color code="38">#5f00d7</color>
<color code="39">#5f00ff</color>
<color code="3a">#5f5f00</color>
<color code="3b">#5f5f5f</color>
<color code="3c">#5f5f87</color>
<color code="3d">#5f5faf</color>
<color code="3e">#5f5fd7</color>
<color code="3f">#5f5fff</color>
<color code="40">#5f8700</color>
<color code="41">#5f875f</color>
<color code="42">#5f8787</color>
<color code="43">#5f87af</color>
<color code="44">#5f87d7</color>
<color code="45">#5f87ff</color>
<color code="46">#5faf00</color>
<color code="47">#5faf5f</color>
<color code="48">#5faf87</color>
<color code="49">#5fafaf</color>
<color code="4a">#5fafd7</color>
<color code="4b">#5fafff</color>
<color code="4c">#5fd700</color>
<color code="4d">#5fd75f</color>
<color code="4e">#5fd787</color>
<color code="4f">#5fd7af</color>
<color code="50">#5fd7d7</color>
<color code="51">#5fd7ff</color>
<color code="52">#5fff00</color>
<color code="53">#5fff5f</color>
<color code="54">#5fff87</color>
<color code="55">#5fffaf</color>
<color code="56">#5fffd7</color>
<color code="57">#5fffff</color>
<color code="58">#870000</color>
<color code="59">#87005f</color>
<color code="5a">#870087</color>
<color code="5b">#8700af</color>
<color code="5c">#8700d7</color>
<color code="5d">#8700ff</color>
<color code="5e">#875f00</color>
<color code="5f">#875f5f</color>
<color code="60">#875f87</color>
<color code="61">#875faf</color>
<color code="62">#875fd7</color>
<color code="63">#875fff</color>
<color code="64">#878700</color>
<color code="65">#87875f</color>
<color code="66">#878787</color>
<color code="67">#8787af</color>
<color code="68">#8787d7</color>
<color code="69">#8787ff</color>
<color code="6a">#87af00</color>
<color code="6b">#87af5f</color>
<color code="6c">#87af87</color>
<color code="6d">#87afaf</color>
<color code="6e">#87afd7</color>
<color code="6f">#87afff</color>
<color code="70">#87d700</color>
<color code="71">#87d75f</color>
<color code="72">#87d787</color>
<color code="73">#87d7af</color>
<color code="74">#87d7d7</color>
<color code="75">#87d7ff</color>
<color code="76">#87ff00</color>
<color code="77">#87ff5f</color>
<color code="78">#87ff87</color>
<color code="79">#87ffaf</color>
<color code="7a">#87ffd7</color>
<color code="7b">#87ffff</color>
<color code="7c">#af0000</color>
<color code="7d">#af005f</color>
<color code="7e">#af0087</color>
<color code="7f">#af00af</color>
<color code="80">#af00d7</color>
<color code="81">#af00ff</color>
<color code="82">#af5f00</color>
<color code="83">#af5f5f</color>
<color code="84">#af5f87</color>
<color code="85">#af5faf</color>
<color code="86">#af5fd7</color>
<color code="87">#af5fff</color>
<color code="88">#af8700</color>
<color code="89">#af875f</color>
<color code="8a">#af8787</color>
<color code="8b">#af87af</color>
<color code="8c">#af87d7</color>
<color code="8d">#af87ff</color>
<color code="8e">#afaf00</color>
<color code="8f">#afaf5f</color>
<color code="90">#afaf87</color>
<color code="91">#afafaf</color>
<color code="92">#afafd7</color>
<color code="93">#afafff</color>
<color code="94">#afd700</color>
<color code="95">#afd75f</color>
<color code="96">#afd787</color>
<color code="97">#afd7af</color>
<color code="98">#afd7d7</color>
<color code="99">#afd7ff</color>
<color code="9a">#afff00</color>
<color code="9b">#afff5f</color>
<color code="9c">#afff87</color>
<color code="9d">#afffaf</color>
<color code="9e">#afffd7</color>
<color code="9f">#afffff</color>
<color code="a0">#d70000</color>
<color code="a1">#d7005f</color>
<color code="a2">#d70087</color>
<color code="a3">#d700af</color>
<color code="a4">#d700d7</color>
<color code="a5">#d700ff</color>
<color code="a6">#d75f00</color>
<color code="a7">#d75f5f</color>
<color code="a8">#d75f87</color>
<color code="a9">#d75faf</color>
<color code="aa">#d75fd7</color>
<color code="ab">#d75fff</color>
<color code="ac">#d78700</color>
<color code="ad">#d7875f</color>
<color code="ae">#d78787</color>
<color code="af">#d787af</color>
<color code="b0">#d787d7</color>
<color code="b1">#d787ff</color>
<color code="b2">#d7af00</color>
<color code="b3">#d7af5f</color>
<color code="b4">#d7af87</color>
<color code="b5">#d7afaf</color>
<color code="b6">#d7afd7</color>
<color code="b7">#d7afff</color>
<color code="b8">#d7d700</color>
<color code="b9">#d7d75f</color>
<color code="ba">#d7d787</color>
<color code="bb">#d7d7af</color>
<color code="bc">#d7d7d7</color>
<color code="bd">#d7d7ff</color>
<color code="be">#d7ff00</color>
<color code="bf">#d7ff5f</color>
<color code="c0">#d7ff87</color>
<color code="c1">#d7ffaf</color>
<color code="c2">#d7ffd7</color>
<color code="c3">#d7ffff</color>
<color code="c4">#ff0000</color>
<color code="c5">#ff005f</color>
<color code="c6">#ff0087</color>
<color code="c7">#ff00af</color>
<color code="c8">#ff00d7</color>
<color code="c9">#ff00ff</color>
<color code="ca">#ff5f00</color>
<color code="cb">#ff5f5f</color>
<color code="cc">#ff5f87</color>
<color code="cd">#ff5faf</color>
<color code="ce">#ff5fd7</color>
<color code="cf">#ff5fff</color>
<color code="d0">#ff8700</color>
<color code="d1">#ff875f</color>
<color code="d2">#ff8787</color>
<color code="d3">#ff87af</color>
<color code="d4">#ff87d7</color>
<color code="d5">#ff87ff</color>
<color code="d6">#ffaf00</color>
<color code="d7">#ffaf5f</color>
<color code="d8">#ffaf87</color>
<color code="d9">#ffafaf</color>
<color code="da">#ffafd7</color>
<color code="db">#ffafff</color>
<color code="dc">#ffd700</color>
<color code="dd">#ffd75f</color>
<color code="de">#ffd787</color>
<color code="df">#ffd7af</color>
<color code="e0">#ffd7d7</color>
<color code="e1">#ffd7ff</color>
<color code="e2">#ffff00</color>
<color code="e3">#ffff5f</color>
<color code="e4">#ffff87</color>
<color code="e5">#ffffaf</color>
<color code="e6">#ffffd7</color>
<color code="e7">#ffffff</color>
<color code="e8">#080808</color>
<color code="e9">#121212</color>
<color code="ea">#1c1c1c</color>
<color code="eb">#262626</color>
<color code="ec">#303030</color>
<color code="ed">#3a3a3a</color>
<color code="ee">#444444</color>
<color code="ef">#4e4e4e</color>
<color code="f0">#585858</color>
<color code="f1">#626262</color>
<color code="f2">#6c6c6c</color>
<color code="f3">#767676</color>
<color code="f4">#808080</color>
<color code="f5">#8a8a8a</color>
<color code="f6">#949494</color>
<color code="f7">#9e9e9e</color>
<color code="f8">#a8a8a8</color>
<color code="f9">#b2b2b2</color>
<color code="fa">#bcbcbc</color>
<color code="fb">#c6c6c6</color>
<color code="fc">#d0d0d0</color>
<color code="fd">#dadada</color>
<color code="fe">#e4e4e4</color>
<color code="ff">#eeeeee</color>
</xsl:variable>
</xsl:stylesheet>
首先，是的，如果 XSLT 样式表中存在不明确的规则匹配项，则会选择最新的（即最后一个）模板。
这个答案大部分是彻头彻尾的猜测，因为我们看不到太多的输入或 XSLT 代码。但似乎单独的模板不太适合处理这个问题。
一般匹配db:command然后使用xsl:if怎么样？
XML 输入
<db:command xmlns:db="http://docbook.org/ns/docbook" role=" fgRed bgGreen ">Lorem Ipsum</db:command>
XSLT 样式表
我做了以下假设：
db:command本身的存在意味着输出中应该有fo:inlinebg或fg后面的（小写）颜色名称是符合 XSL-FO 规范的颜色
一个完整的例子：
<?xml version="1.0" encoding="UTF-8" ?>
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"
xmlns:db="http://docbook.org/ns/docbook"
xmlns:fo="http://www.w3.org/1999/XSL/Format">
<xsl:output method="xml" omit-xml-declaration="yes" encoding="UTF-8" indent="yes" />
<xsl:template match="db:command">
<fo:inline>
<xsl:if test="contains(@role, 'bg')">
<xsl:attribute name="background-color">
<xsl:value-of select="translate(substring-before(substring-after(@role,'bg'),' '),'ABCDEFGHIJKLMNOPQRSTUVWXYZ','abcdefghjiklmnopqrstuvwxyz')"/>
</xsl:attribute>
</xsl:if>
<xsl:if test="contains(@role, 'fg')">
<xsl:attribute name="color">
<xsl:value-of select="translate(substring-before(substring-after(@role,'fg'),' '),'ABCDEFGHIJKLMNOPQRSTUVWXYZ','abcdefghjiklmnopqrstuvwxyz')"/>
</xsl:attribute>
</xsl:if>
<!--Add more if conditions for any other formatting style-->
</fo:inline>
</xsl:template>
</xsl:transform>
XML 输出
<fo:inline xmlns:db="http://docbook.org/ns/docbook"
xmlns:fo="http://www.w3.org/1999/XSL/Format"
background-color="green"
color="red"/>
编辑：经过我们的讨论，代码的另一个版本。
XML 输入
输入 XML 现在为：
<db:command xmlns:db="http://docbook.org/ns/docbook" role=" f00 b01 ">Lorem Ipsum</db:command>
XSLT 1.0 样式表（需要 EXSLT）
样式表使用 EXSLT 的str:tokenize()函数，但我已经用我的 xsltproc 版本进行了测试，支持此功能。
<?xml version="1.0" encoding="UTF-8" ?>
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"
xmlns:db="http://docbook.org/ns/docbook"
xmlns:fo="http://www.w3.org/1999/XSL/Format"
xmlns:str="http://exslt.org/strings"
extension-element-prefixes="str">
<xsl:output method="xml" omit-xml-declaration="yes" encoding="UTF-8" indent="yes" />
<xsl:template match="db:command">
<fo:inline>
<xsl:for-each select="str:tokenize(@role,' ')">
<xsl:if test="contains(.,'f')">
<xsl:attribute name="color">
<xsl:if test="substring-after(.,'f') = '00'">
<xsl:value-of select="'#000000'"/>
</xsl:if>
<!--Other possible values-->
</xsl:attribute>
</xsl:if>
<xsl:if test="contains(.,'b')">
<xsl:attribute name="background-color">
<xsl:if test="substring-after(.,'b') = '01'">
<xsl:value-of select="'#000000'"/>
</xsl:if>
<!--Other possible values-->
</xsl:attribute>
</xsl:if>
</xsl:for-each>
<xsl:apply-templates/>
</fo:inline>
</xsl:template>
<xsl:template match="text()">
<xsl:copy/>
</xsl:template>
</xsl:transform>
XSL-FO 输出
<fo:inline xmlns:fo="http://www.w3.org/1999/XSL/Format" xmlns:db="http://docbook.org/ns/docbook" color="#000000" background-color="#000000">Lorem Ipsum</fo:inline>