piegames
cf57b5c14c
The code for serialization Expr nodes back into (pseudo-)Nix has been removed for being subtly error-prone and tedious to maintain. Instead, `nix-instantiate --parse` now prints a JSON representation of the AST. Usage patterns of the --parse flag I've found in the wild: 1. Check if a file is well-formed, i.e. discard output and test exit code 2. Get parser errors from a file, i.e. discard stdout and use stderr 3. Nixfmt uses --parse to test equivalence pre/post format, and that property is (should be?) preserved None of these should break with the current change Closes #487 Change-Id: Icdbaad17790f2ad8765fa08e02e6597ee4c7a909
376 lines
13 KiB
Plaintext
376 lines
13 KiB
Plaintext
_type: ExprLet
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attrs:
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s1:
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_type: ExprString
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value: "This is an indented multi-line string\nliteral. An amount of whitespace\
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\ at\nthe start of each line matching the minimum\nindentation of all lines\
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\ in the string\nliteral together will be removed. Thus,\nin this case four\
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\ spaces will be\nstripped from each line, even though\n THIS LINE is indented\
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\ six spaces.\n\nAlso, empty lines don't count in the\ndetermination of the\
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\ indentation level (the\nprevious empty line has indentation 0, but\nit doesn't\
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\ matter).\n"
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s10:
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_type: ExprString
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value: ''
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s11:
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_type: ExprString
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value: ''
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s12:
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_type: ExprString
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value: ''
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s13:
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_type: ExprConcatStrings
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es:
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- _type: ExprString
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value: "start on network-interfaces\n\nstart script\n\n rm -f /var/run/opengl-driver\n\
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\ "
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- _type: ExprIf
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cond:
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_type: ExprVar
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value: 'true'
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else:
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_type: ExprIf
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cond:
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_type: ExprVar
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value: 'true'
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else:
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_type: ExprString
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value: ''
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then:
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_type: ExprString
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value: ln -sf 456 /var/run/opengl-driver
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then:
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_type: ExprString
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value: ln -sf 123 /var/run/opengl-driver
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- _type: ExprString
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value: "\n\n rm -f /var/log/slim.log\n \nend script\n\nenv SLIM_CFGFILE="
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- _type: ExprString
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value: abc
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- _type: ExprString
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value: '
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env SLIM_THEMESDIR='
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- _type: ExprString
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value: def
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- _type: ExprString
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value: "\nenv FONTCONFIG_FILE=/etc/fonts/fonts.conf \t\t\t\t# !!! cleanup\n\
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env XKB_BINDIR="
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- _type: ExprString
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value: foo
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- _type: ExprString
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value: "/bin \t\t\t\t# Needed for the Xkb extension.\nenv LD_LIBRARY_PATH="
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- _type: ExprString
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value: libX11
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- _type: ExprString
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value: '/lib:'
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- _type: ExprString
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value: libXext
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- _type: ExprString
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value: '/lib:/usr/lib/ # related to xorg-sys-opengl - needed to load
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libglx for (AI)GLX support (for compiz)
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'
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- _type: ExprIf
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cond:
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_type: ExprVar
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value: 'true'
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else:
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_type: ExprIf
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cond:
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_type: ExprVar
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value: 'true'
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else:
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_type: ExprString
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value: ''
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then:
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_type: ExprConcatStrings
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es:
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- _type: ExprString
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value: env XORG_DRI_DRIVER_PATH=
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- _type: ExprString
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value: mesa
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- _type: ExprString
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value: /lib/modules/dri
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forceString: true
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then:
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_type: ExprConcatStrings
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es:
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- _type: ExprString
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value: env XORG_DRI_DRIVER_PATH=
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- _type: ExprString
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value: nvidiaDrivers
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- _type: ExprString
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value: /X11R6/lib/modules/drivers/
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forceString: true
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- _type: ExprString
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value: " \n\nexec "
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- _type: ExprString
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value: slim
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- _type: ExprString
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value: '/bin/slim
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'
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forceString: true
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s14:
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_type: ExprString
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value: "Escaping of ' followed by ': ''\nEscaping of $ followed by {: ${\nAnd\
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\ finally to interpret \\n etc. as in a string: \n, \r, \t.\n"
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s15:
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_type: ExprLet
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attrs:
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x:
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_type: ExprString
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value: bla
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body:
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_type: ExprConcatStrings
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es:
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- _type: ExprString
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value: 'foo
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'''
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- _type: ExprVar
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value: x
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- _type: ExprString
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value: '''
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bar
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'
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forceString: true
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s16:
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_type: ExprString
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value: 'cut -d $''\t'' -f 1
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'
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s17:
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_type: ExprConcatStrings
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es:
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- _type: ExprConcatStrings
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es:
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- _type: ExprString
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value: ending dollar $
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- _type: ExprString
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value: $
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forceString: false
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- _type: ExprString
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value: '
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'
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forceString: false
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s18:
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_type: ExprString
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value: " Lines without any indentation effectively disable the indentation\n\
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\ stripping for the entire string:\n\n cat >$out/foo/data <<EOF\n\
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\ lasjdöaxnasd\nasdom 12398\nä\"§Æẞ¢«»”alsd\nEOF\n"
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s19:
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_type: ExprString
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value: "Empty lines with a bit of whitespace don't affect the indentation calculation:\n\
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\nAnd empty lines with more whitespace will have whitespace in the string:\n\
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\ \nUnless it's the last line:\n"
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s2:
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_type: ExprString
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value: "If the string starts with whitespace\n followed by a newline, it's stripped,\
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\ but\n that's not the case here. Two spaces are\n stripped because of the\
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\ \" \" at the start. \n"
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s20:
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_type: ExprString
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value: " Indentation stripping\n must not be impressed by\nthe last line not\
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\ being empty"
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s21:
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_type: ExprString
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value: "\t Nor by people\n weirdly mixing tabs\n\tand spaces\n\t"
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s3:
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_type: ExprString
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value: 'This line is indented
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a bit further.
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'
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s4:
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_type: ExprConcatStrings
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es:
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- _type: ExprString
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value: 'Anti-quotations, like '
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- _type: ExprIf
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cond:
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_type: ExprVar
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value: 'true'
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else:
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_type: ExprString
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value: not so
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then:
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_type: ExprString
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value: so
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- _type: ExprString
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value: ', are
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also allowed.
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'
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forceString: true
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s5:
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_type: ExprConcatStrings
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es:
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- _type: ExprString
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value: ' The \ is not special here.
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'' can be followed by any character except another '', e.g. ''x''.
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Likewise for $, e.g. $$ or $varName.
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But '' followed by '' is special, as is $ followed by {.
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If you want them, use anti-quotations: '
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- _type: ExprString
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value: ''''''
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- _type: ExprString
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value: ', '
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- _type: ExprString
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value: ${
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- _type: ExprString
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value: '.
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'
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forceString: true
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s6:
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_type: ExprString
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value: " Tabs are not interpreted as whitespace (since we can't guess\n what\
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\ tab settings are intended), so don't use them.\n\tThis line starts with a\
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\ space and a tab, so only one\n space will be stripped from each line.\n"
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s7:
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_type: ExprString
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value: 'Also note that if the last line (just before the closing '' '')
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consists only of whitespace, it''s ignored. But here there is
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some non-whitespace stuff, so the line isn''t removed. '
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s8:
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_type: ExprConcatStrings
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es:
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- _type: ExprString
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value: ''
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- _type: ExprString
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value: '
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This shows a hacky way to preserve an empty line after the start.
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But there''s no reason to do so: you could just repeat the empty
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line.
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'
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forceString: true
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s9:
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_type: ExprConcatStrings
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es:
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- _type: ExprString
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value: ''
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- _type: ExprString
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value: " Similarly you can force an indentation level,\n in this case to\
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\ 2 spaces. This works because the anti-quote\n is significant (not whitespace).\n"
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forceString: true
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body:
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_type: ExprConcatStrings
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es:
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- _type: ExprConcatStrings
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es:
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- _type: ExprConcatStrings
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es:
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- _type: ExprConcatStrings
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es:
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- _type: ExprConcatStrings
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es:
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- _type: ExprConcatStrings
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es:
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- _type: ExprConcatStrings
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es:
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- _type: ExprConcatStrings
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es:
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- _type: ExprConcatStrings
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es:
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- _type: ExprConcatStrings
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es:
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- _type: ExprConcatStrings
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es:
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- _type: ExprConcatStrings
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es:
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- _type: ExprConcatStrings
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es:
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- _type: ExprConcatStrings
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es:
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- _type: ExprConcatStrings
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es:
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- _type: ExprConcatStrings
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es:
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- _type: ExprConcatStrings
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es:
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- _type: ExprConcatStrings
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es:
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- _type: ExprConcatStrings
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es:
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- _type: ExprConcatStrings
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es:
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- _type: ExprVar
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value: s1
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- _type: ExprVar
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value: s2
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forceString: false
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- _type: ExprVar
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value: s3
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forceString: false
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- _type: ExprVar
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value: s4
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forceString: false
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- _type: ExprVar
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value: s5
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forceString: false
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- _type: ExprVar
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value: s6
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forceString: false
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- _type: ExprVar
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value: s7
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forceString: false
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- _type: ExprVar
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value: s8
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forceString: false
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- _type: ExprVar
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value: s9
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forceString: false
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- _type: ExprVar
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value: s10
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forceString: false
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- _type: ExprVar
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value: s11
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forceString: false
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- _type: ExprVar
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value: s12
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forceString: false
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- _type: ExprVar
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value: s13
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forceString: false
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- _type: ExprVar
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value: s14
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forceString: false
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- _type: ExprVar
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value: s15
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forceString: false
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- _type: ExprVar
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value: s16
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forceString: false
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- _type: ExprVar
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value: s17
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forceString: false
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- _type: ExprVar
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value: s18
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forceString: false
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- _type: ExprVar
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value: s19
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forceString: false
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- _type: ExprVar
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value: s20
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forceString: false
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- _type: ExprVar
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value: s21
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forceString: false
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