You're increase of the pool size lead to additional memory requirements. So you do not need any other changes to eTeX, you have to increase the provided memory. In your Javascript versions, the amount of memory is set in the "compiler".
For your settings you would need 32906 pages of memory, but there is an impmentation limit at 32767 pages. Luckily you can avoid this problem by using smaller values.
So we need to change some of the constants form etex.web.
This doesn't mean that your etex.ch is "wrong" and you need a "right" one.
Actually the license of etex.ch would forbid such modifications(At least without changing the name).
Instead you should write a system dependent etex.sys file which you can pass to tangle later.
So first get copies from tex.web and etex.ch, then run
tie -m etex.web tex.web etex.ch
to get etex.web. Now you need a changefile with you new constants, for example save the following as etex.sys:
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
@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
Now you can run tangle:
tangle -underline etex.web etex.sys
You get the files etex.p and etex.pool.
Of course web2js will still look for tex.pool, but you can just change
filename = "tex.pool";
into
filename = "etex.pool";
in both header.js and library.js.
Now let's try
node compile.js etex.p
Similar to your original experiment, we get
[...]
Need 41 of memory
Now 41 is significantly less than 32906, especially it is below 32767. So we can just allocate more memory. This needs to be done consistently in four files: In index.js, initex.js, tex.js and pascal/program.js, change
var pages = 20;
into
var pages = 50;
(Probably 41 would be enough, but 50 looks nicer)
Now we can try
node compile.js etex.p
again. This time it actually works! You could use node initex.js now to get plain-TeX format, but we actually want eTeX. So you can get yourself a version of etex.src, etexdefs.lib and language.def and change
library.setInput("\nplain \\dump\n\n"
in initex.js into
library.setInput("\n*etex \\dump\n\n"
Here, the asterisk * is important, it enables the "extended mode".
Also change &plain into &etex in the same file to preload etex.
Then
node initex.js
generates a e-TeX format etex.fmt and a memory dump, which can be used with
node tex.js
tex.webwithetex.ch(e.g.tangle tex.web etex.chI think), or you can trypdftex.webor evenxetex.webfrom the TeX Live sources.