我需要对 tex.ch 中的 tex.web 进行以下更改。该部分从第 707 行开始。实际更改涉及最后两行。
@ The ASCII code is ``standard'' only to a certain extent, since many
computer installations have found it advantageous to have ready access
to more than 94 printing characters. Appendix~C of {\sl The \TeX book\/}
gives a complete specification of the intended correspondence between
characters and \TeX's internal representation.
@:TeXbook}{\sl The \TeX book@>
If \TeX\ is being used
on a garden-variety \PASCAL\ for which only standard ASCII
codes will appear in the input and output files, it doesn't really matter
what codes are specified in |xchr[0..@'37]|, but the safest policy is to
blank everything out by using the code shown below.
However, other settings of |xchr| will make \TeX\ more friendly on
computers that have an extended character set, so that users can type things
like `\.^^Z' instead of `\.{\\ne}'. People with extended character sets can
assign codes arbitrarily, giving an |xchr| equivalent to whatever
characters the users of \TeX\ are allowed to have in their input files.
It is best to make the codes correspond to the intended interpretations as
shown in Appendix~C whenever possible; but this is not necessary. For
example, in countries with an alphabet of more than 26 letters, it is
usually best to map the additional letters into codes less than~@'40.
To get the most ``permissive'' character set, change |' '| on the
right of these assignment statements to |chr(i)|.
@^character set dependencies@>
@^system dependencies@>
@<Set init...@>=
for i:=0 to @'37 do xchr[i]:=chr(i);
for i:=@'177 to @'377 do xchr[i]:=chr(i);
更改自：
for i:=0 to @'37 do xchr[i]:=' ';
for i:=@'177 to @'377 do xchr[i]:=' ';
tex.web并且etex.ch是原始文件。
etex.sys来自 Marcel Krüger 对我的问题的回答：我在哪里可以找到或者如何制作正确的 etex.ch？
此处描述的更改由 David Carlisle 建议修复从 etex.src 转储 etex 时如何避免“Chi UTF-8 错误”？。
我已尝试过，得到了这个结果。
(Pardon me, but I think I spotted something wrong..)
在这里再一次向所有给予过帮助的人表示感谢！
答案1
我建议将此更改打包到 eTeX 的系统更改文件中etex.sys。它是 TeX 的 eTeX 等效版本tex.ch，并且同时使用两者很困难，因为tangle只接受一个更改文件。
如果你阅读的话，etex_gen.tex你会看到你需要将所有tex.ch更改都包含在内etex.sys。
另一种方法是tex.ch使用 来应用单独的更改文件tie，但这会创建一个新的tex.web（不好，tex.web根据其许可声明不应更改）或创建一个新的etex.web（不好，etex.web应始终为原始 eTeX 代码）。（您可以为您的 Web 文件发明一个新名称，但这样会造成混乱。）
因此，添加etex.sys以下行
@x [2.23] l.723 - Translate characters if desired, otherwise allow them all.
for i:=0 to @'37 do xchr[i]:=' ';
for i:=@'177 to @'377 do xchr[i]:=' ';
@y
{Initialize |xchr| to the identity mapping.}
for i:=0 to @'37 do xchr[i]:=chr(i);
for i:=@'177 to @'377 do xchr[i]:=chr(i);
@z
诀窍是在哪里添加这些行：您必须确保 中的块顺序与etex.sys要更改的行在原始源中出现的顺序相对应。xchr分配位于@<Constants...@>=和@d min_quarterword块之间，因此更改必须在中间添加。完整的系统相关更改文件变为：（我用 标记插入----> ... <----）
eTeX compatible constants for web2js
@x
@<Constants...@>=
@!mem_max=30000; {greatest index in \TeX's internal |mem| array;
must be strictly less than |max_halfword|;
must be equal to |mem_top| in \.{INITEX}, otherwise |>=mem_top|}
@!mem_min=0; {smallest index in \TeX's internal |mem| array;
must be |min_halfword| or more;
must be equal to |mem_bot| in \.{INITEX}, otherwise |<=mem_bot|}
@!buf_size=500; {maximum number of characters simultaneously present in
current lines of open files and in control sequences between
\.{\\csname} and \.{\\endcsname}; must not exceed |max_halfword|}
@!error_line=72; {width of context lines on terminal error messages}
@!half_error_line=42; {width of first lines of contexts in terminal
error messages; should be between 30 and |error_line-15|}
@!max_print_line=79; {width of longest text lines output; should be at least 60}
@!stack_size=200; {maximum number of simultaneous input sources}
@!max_in_open=6; {maximum number of input files and error insertions that
can be going on simultaneously}
@!font_max=75; {maximum internal font number; must not exceed |max_quarterword|
and must be at most |font_base+256|}
@!font_mem_size=20000; {number of words of |font_info| for all fonts}
@!param_size=60; {maximum number of simultaneous macro parameters}
@!nest_size=40; {maximum number of semantic levels simultaneously active}
@!max_strings=3000; {maximum number of strings; must not exceed |max_halfword|}
@!string_vacancies=8000; {the minimum number of characters that should be
available for the user's control sequences and font names,
after \TeX's own error messages are stored}
@!pool_size=32000; {maximum number of characters in strings, including all
error messages and help texts, and the names of all fonts and
control sequences; must exceed |string_vacancies| by the total
length of \TeX's own strings, which is currently about 23000}
@!save_size=600; {space for saving values outside of current group; must be
at most |max_halfword|}
@!trie_size=8000; {space for hyphenation patterns; should be larger for
\.{INITEX} than it is in production versions of \TeX}
@!trie_op_size=500; {space for ``opcodes'' in the hyphenation patterns}
@!dvi_buf_size=800; {size of the output buffer; must be a multiple of 8}
@!file_name_size=40; {file names shouldn't be longer than this}
@!pool_name='TeXformats:TEX.POOL ';
{string of length |file_name_size|; tells where the string pool appears}
@.TeXformats@>
@ Like the preceding parameters, the following quantities can be changed
at compile time to extend or reduce \TeX's capacity. But if they are changed,
it is necessary to rerun the initialization program \.{INITEX}
@.INITEX@>
to generate new tables for the production \TeX\ program.
One can't simply make helter-skelter changes to the following constants,
since certain rather complex initialization
numbers are computed from them. They are defined here using
\.{WEB} macros, instead of being put into \PASCAL's |const| list, in order to
emphasize this distinction.
@d mem_bot=0 {smallest index in the |mem| array dumped by \.{INITEX};
must not be less than |mem_min|}
@d mem_top==30000 {largest index in the |mem| array dumped by \.{INITEX};
must be substantially larger than |mem_bot|
and not greater than |mem_max|}
@y
@<Constants...@>=
@!mem_max=200000; {greatest index in \TeX's internal |mem| array;
must be strictly less than |max_halfword|;
must be equal to |mem_top| in \.{INITEX}, otherwise |>=mem_top|}
@!mem_min=0; {smallest index in \TeX's internal |mem| array;
must be |min_halfword| or more;
must be equal to |mem_bot| in \.{INITEX}, otherwise |<=mem_bot|}
@!buf_size=5000; {maximum number of characters simultaneously present in
current lines of open files and in control sequences between
\.{\\csname} and \.{\\endcsname}; must not exceed |max_halfword|}
@!error_line=72; {width of context lines on terminal error messages}
@!half_error_line=42; {width of first lines of contexts in terminal
error messages; should be between 30 and |error_line-15|}
@!max_print_line=79; {width of longest text lines output; should be at least 60}
@!stack_size=1000; {maximum number of simultaneous input sources}
@!max_in_open=6; {maximum number of input files and error insertions that
can be going on simultaneously}
@!font_max=75; {maximum internal font number; must not exceed |max_quarterword|
and must be at most |font_base+256|}
@!font_mem_size=20000; {number of words of |font_info| for all fonts}
@!param_size=60; {maximum number of simultaneous macro parameters}
@!nest_size=40; {maximum number of semantic levels simultaneously active}
@!max_strings=60000; {maximum number of strings; must not exceed |max_halfword|}
@!string_vacancies=300000; {the minimum number of characters that should be
available for the user's control sequences and font names,
after \TeX's own error messages are stored}
@!pool_size=350000; {maximum number of characters in strings, including all
error messages and help texts, and the names of all fonts and
control sequences; must exceed |string_vacancies| by the total
length of \TeX's own strings, which is currently about 23000}
@!save_size=600; {space for saving values outside of current group; must be
at most |max_halfword|}
@!trie_size=8000; {space for hyphenation patterns; should be larger for
\.{INITEX} than it is in production versions of \TeX}
@!trie_op_size=500; {space for ``opcodes'' in the hyphenation patterns}
@!dvi_buf_size=800; {size of the output buffer; must be a multiple of 8}
@!file_name_size=40; {file names shouldn't be longer than this}
@!pool_name='TeXformats:TEX.POOL ';
{string of length |file_name_size|; tells where the string pool appears}
@.TeXformats@>
@ Like the preceding parameters, the following quantities can be changed
at compile time to extend or reduce \TeX's capacity. But if they are changed,
it is necessary to rerun the initialization program \.{INITEX}
@.INITEX@>
to generate new tables for the production \TeX\ program.
One can't simply make helter-skelter changes to the following constants,
since certain rather complex initialization
numbers are computed from them. They are defined here using
\.{WEB} macros, instead of being put into \PASCAL's |const| list, in order to
emphasize this distinction.
@d mem_bot=0 {smallest index in the |mem| array dumped by \.{INITEX};
must not be less than |mem_min|}
@d mem_top==200000 {largest index in the |mem| array dumped by \.{INITEX};
must be substantially larger than |mem_bot|
and not greater than |mem_max|}
@z
----> Here we add the bigger codepage: <----
@x
for i:=0 to @'37 do xchr[i]:=' ';
for i:=@'177 to @'377 do xchr[i]:=' ';
@y
for i:=0 to @'37 do xchr[i]:=chr(i);
for i:=@'177 to @'377 do xchr[i]:=chr(i);
@z
----> End of insertion <----
@x
@d min_quarterword=0 {smallest allowable value in a |quarterword|}
@d max_quarterword=255 {largest allowable value in a |quarterword|}
@d min_halfword==0 {smallest allowable value in a |halfword|}
@d max_halfword==65535 {largest allowable value in a |halfword|}
@y
@d min_quarterword=0 {smallest allowable value in a |quarterword|}
@d max_quarterword=255 {largest allowable value in a |quarterword|}
@d min_halfword==0 {smallest allowable value in a |halfword|}
@d max_halfword==16777215 {largest allowable value in a |halfword|}
@z
然后就用通常的舞蹈吧：
tie -m etex.web tex.web etex.ch
tangle -underline etex.web etex.sys