Lualatex code to select enclosed text from another file
2
I am trying to write a function that would select a text delimited by some symbols (*) from another file and print it. The following gives an error. What is the right way to pass 'text' to string.gsub?
documentclass{scrartcl}
usepackage{luatextra}
usepackage{filecontents}
begin{filecontents}{testdata.dat}
a *string enclosed in* stars
end{filecontents}
begin{luacode*}
function readtxt()
file = io.open("testdata.dat", "r")
text = file:read("*all")
file:close()
for x in string.gsub(text,"*(.*)*","") do
tex.print(x)
end
end
end{luacode*}
begin{document}
directlua{readtxt()}
end{document}
luatex
asked Jan 22 at 18:55
Dmitry StarostinDmitry Starostin
754
add a comment |
2
I am trying to write a function that would select a text delimited by some symbols (*) from another file and print it. The following gives an error. What is the right way to pass 'text' to string.gsub?
documentclass{scrartcl}
usepackage{luatextra}
usepackage{filecontents}
begin{filecontents}{testdata.dat}
a *string enclosed in* stars
end{filecontents}
begin{luacode*}
function readtxt()
file = io.open("testdata.dat", "r")
text = file:read("*all")
file:close()
for x in string.gsub(text,"*(.*)*","") do
tex.print(x)
end
end
end{luacode*}
begin{document}
directlua{readtxt()}
end{document}
luatex
asked Jan 22 at 18:55
Dmitry StarostinDmitry Starostin
754
Are you sure you want to use*(.*)*? This does not select the literal*which you seemingly want to use as delimiter…
– TeXnician
Jan 22 at 20:22
add a comment |
2
2
2
I am trying to write a function that would select a text delimited by some symbols (*) from another file and print it. The following gives an error. What is the right way to pass 'text' to string.gsub?
documentclass{scrartcl}
usepackage{luatextra}
usepackage{filecontents}
begin{filecontents}{testdata.dat}
a *string enclosed in* stars
end{filecontents}
begin{luacode*}
function readtxt()
file = io.open("testdata.dat", "r")
text = file:read("*all")
file:close()
for x in string.gsub(text,"*(.*)*","") do
tex.print(x)
end
end
end{luacode*}
begin{document}
directlua{readtxt()}
end{document}
luatex
asked Jan 22 at 18:55
Dmitry StarostinDmitry Starostin
754
I am trying to write a function that would select a text delimited by some symbols (*) from another file and print it. The following gives an error. What is the right way to pass 'text' to string.gsub?
documentclass{scrartcl}
usepackage{luatextra}
usepackage{filecontents}
begin{filecontents}{testdata.dat}
a *string enclosed in* stars
end{filecontents}
begin{luacode*}
function readtxt()
file = io.open("testdata.dat", "r")
text = file:read("*all")
file:close()
for x in string.gsub(text,"*(.*)*","") do
tex.print(x)
end
end
end{luacode*}
begin{document}
directlua{readtxt()}
end{document}
luatex
luatex
asked Jan 22 at 18:55
Dmitry StarostinDmitry Starostin
754
asked Jan 22 at 18:55
Dmitry StarostinDmitry Starostin
754
asked Jan 22 at 18:55
Dmitry StarostinDmitry Starostin
754
asked Jan 22 at 18:55
Dmitry StarostinDmitry Starostin
754
asked Jan 22 at 18:55
Dmitry StarostinDmitry Starostin
754
754
Are you sure you want to use*(.*)*? This does not select the literal*which you seemingly want to use as delimiter…
– TeXnician
Jan 22 at 20:22
add a comment |
Are you sure you want to use*(.*)*? This does not select the literal*which you seemingly want to use as delimiter…
– TeXnician
Jan 22 at 20:22
Are you sure you want to use
*(.*)*? This does not select the literal * which you seemingly want to use as delimiter…– TeXnician
Jan 22 at 20:22
Are you sure you want to use
*(.*)*? This does not select the literal * which you seemingly want to use as delimiter…– TeXnician
Jan 22 at 20:22
add a comment |
1 Answer
1
active
oldest
votes
2
You need to use gmatch instead of gsub. And probably non greedy regexp (.-) if there are more then one match:
documentclass{scrartcl}
usepackage{luatextra}
usepackage{filecontents}
begin{filecontents}{testdata.dat}
a *string enclosed in* stars *two*
end{filecontents}
begin{luacode*}
function readtxt()
file = io.open("testdata.dat", "r")
text = file:read("*all")
file:close()
for x in string.gmatch(text,"*(.-)*") do
tex.print(x)
end
end
end{luacode*}
begin{document}
directlua{readtxt()}
end{document}
answered Jan 22 at 21:01
Denys PotapovDenys Potapov
2067
Thank you! To print in lines, how does one insert par or n so that Latex correctly transfer it to luacode? tex.print(x)\par?Obviously tex.print(x)n does not work since n = ^^J.
– Dmitry Starostin
Jan 23 at 6:34
tex.print(x .. "\par")
– Denys Potapov
Jan 23 at 6:37
If I want to include some commands like footnote into the text processed by lua (I cannot find the answers on this site right now), do I redefine catcode for within begin{luacode*} and then redefine it back within luacode or right after it ends? Is this the 'right' way (and the most direct way)?
– Dmitry Starostin
Jan 24 at 12:33
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
2
You need to use gmatch instead of gsub. And probably non greedy regexp (.-) if there are more then one match:
documentclass{scrartcl}
usepackage{luatextra}
usepackage{filecontents}
begin{filecontents}{testdata.dat}
a *string enclosed in* stars *two*
end{filecontents}
begin{luacode*}
function readtxt()
file = io.open("testdata.dat", "r")
text = file:read("*all")
file:close()
for x in string.gmatch(text,"*(.-)*") do
tex.print(x)
end
end
end{luacode*}
begin{document}
directlua{readtxt()}
end{document}
answered Jan 22 at 21:01
Denys PotapovDenys Potapov
2067
Thank you! To print in lines, how does one insert par or n so that Latex correctly transfer it to luacode? tex.print(x)\par?Obviously tex.print(x)n does not work since n = ^^J.
– Dmitry Starostin
Jan 23 at 6:34
tex.print(x .. "\par")
– Denys Potapov
Jan 23 at 6:37
If I want to include some commands like footnote into the text processed by lua (I cannot find the answers on this site right now), do I redefine catcode for within begin{luacode*} and then redefine it back within luacode or right after it ends? Is this the 'right' way (and the most direct way)?
– Dmitry Starostin
Jan 24 at 12:33
add a comment |
2
You need to use gmatch instead of gsub. And probably non greedy regexp (.-) if there are more then one match:
documentclass{scrartcl}
usepackage{luatextra}
usepackage{filecontents}
begin{filecontents}{testdata.dat}
a *string enclosed in* stars *two*
end{filecontents}
begin{luacode*}
function readtxt()
file = io.open("testdata.dat", "r")
text = file:read("*all")
file:close()
for x in string.gmatch(text,"*(.-)*") do
tex.print(x)
end
end
end{luacode*}
begin{document}
directlua{readtxt()}
end{document}
answered Jan 22 at 21:01
Denys PotapovDenys Potapov
2067
Thank you! To print in lines, how does one insert par or n so that Latex correctly transfer it to luacode? tex.print(x)\par?Obviously tex.print(x)n does not work since n = ^^J.
– Dmitry Starostin
Jan 23 at 6:34
tex.print(x .. "\par")
– Denys Potapov
Jan 23 at 6:37
If I want to include some commands like footnote into the text processed by lua (I cannot find the answers on this site right now), do I redefine catcode for within begin{luacode*} and then redefine it back within luacode or right after it ends? Is this the 'right' way (and the most direct way)?
– Dmitry Starostin
Jan 24 at 12:33
add a comment |
2
2
2
You need to use gmatch instead of gsub. And probably non greedy regexp (.-) if there are more then one match:
documentclass{scrartcl}
usepackage{luatextra}
usepackage{filecontents}
begin{filecontents}{testdata.dat}
a *string enclosed in* stars *two*
end{filecontents}
begin{luacode*}
function readtxt()
file = io.open("testdata.dat", "r")
text = file:read("*all")
file:close()
for x in string.gmatch(text,"*(.-)*") do
tex.print(x)
end
end
end{luacode*}
begin{document}
directlua{readtxt()}
end{document}
answered Jan 22 at 21:01
Denys PotapovDenys Potapov
2067
You need to use gmatch instead of gsub. And probably non greedy regexp (.-) if there are more then one match:
documentclass{scrartcl}
usepackage{luatextra}
usepackage{filecontents}
begin{filecontents}{testdata.dat}
a *string enclosed in* stars *two*
end{filecontents}
begin{luacode*}
function readtxt()
file = io.open("testdata.dat", "r")
text = file:read("*all")
file:close()
for x in string.gmatch(text,"*(.-)*") do
tex.print(x)
end
end
end{luacode*}
begin{document}
directlua{readtxt()}
end{document}
answered Jan 22 at 21:01
Denys PotapovDenys Potapov
2067
answered Jan 22 at 21:01
Denys PotapovDenys Potapov
2067
answered Jan 22 at 21:01
Denys PotapovDenys Potapov
2067
answered Jan 22 at 21:01
Denys PotapovDenys Potapov
2067
2067
Thank you! To print in lines, how does one insert par or n so that Latex correctly transfer it to luacode? tex.print(x)\par?Obviously tex.print(x)n does not work since n = ^^J.
– Dmitry Starostin
Jan 23 at 6:34
tex.print(x .. "\par")
– Denys Potapov
Jan 23 at 6:37
If I want to include some commands like footnote into the text processed by lua (I cannot find the answers on this site right now), do I redefine catcode for within begin{luacode*} and then redefine it back within luacode or right after it ends? Is this the 'right' way (and the most direct way)?
– Dmitry Starostin
Jan 24 at 12:33
add a comment |
Thank you! To print in lines, how does one insert par or n so that Latex correctly transfer it to luacode? tex.print(x)\par?Obviously tex.print(x)n does not work since n = ^^J.
– Dmitry Starostin
Jan 23 at 6:34
tex.print(x .. "\par")
– Denys Potapov
Jan 23 at 6:37
If I want to include some commands like footnote into the text processed by lua (I cannot find the answers on this site right now), do I redefine catcode for within begin{luacode*} and then redefine it back within luacode or right after it ends? Is this the 'right' way (and the most direct way)?
– Dmitry Starostin
Jan 24 at 12:33
Thank you! To print in lines, how does one insert par or n so that Latex correctly transfer it to luacode? tex.print(x)\par?Obviously tex.print(x)n does not work since n = ^^J.
– Dmitry Starostin
Jan 23 at 6:34
Thank you! To print in lines, how does one insert par or n so that Latex correctly transfer it to luacode? tex.print(x)\par?Obviously tex.print(x)n does not work since n = ^^J.
– Dmitry Starostin
Jan 23 at 6:34
tex.print(x .. "\par")– Denys Potapov
Jan 23 at 6:37
tex.print(x .. "\par")– Denys Potapov
Jan 23 at 6:37
If I want to include some commands like footnote into the text processed by lua (I cannot find the answers on this site right now), do I redefine catcode for within begin{luacode*} and then redefine it back within luacode or right after it ends? Is this the 'right' way (and the most direct way)?
– Dmitry Starostin
Jan 24 at 12:33
If I want to include some commands like footnote into the text processed by lua (I cannot find the answers on this site right now), do I redefine catcode for within begin{luacode*} and then redefine it back within luacode or right after it ends? Is this the 'right' way (and the most direct way)?
– Dmitry Starostin
Jan 24 at 12:33
add a comment |
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Are you sure you want to use
*(.*)*? This does not select the literal*which you seemingly want to use as delimiter…– TeXnician
Jan 22 at 20:22