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libexpr: quote reserved keys when printing

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This fixes a bug in commands like `nix eval' which would emit invalid attribute
sets if they contained reserved keywords such as "assert", "let", etc.

These keywords will not be quoted when printed, making them valid expressions.
All keywords recognized by the lexer are quoted except "or", which does not
require quotation.
This commit is contained in:
Alex Ameen 2023-05-09 09:45:12 -05:00
parent 4539ab530a
commit b72bc4a972
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GPG key ID: 6EAC957F8EEB55C0
4 changed files with 33 additions and 4 deletions
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2
tests/eval.sh
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@ -19,6 +19,7 @@ nix eval --expr 'assert 1 + 2 == 3; true'
[[ $(nix eval attr -f "./eval.nix") == '{ foo = "bar"; }' ]]
[[ $(nix eval attr --json -f "./eval.nix") == '{"foo":"bar"}' ]]
[[ $(nix eval int -f - < "./eval.nix") == 123 ]]
[[ $(nix eval --expr '{"assert"=1;bar=2;}') == '{ "assert" = 1; bar = 2; }' ]]
# Check if toFile can be utilized during restricted eval
[[ $(nix eval --restrict-eval --expr 'import (builtins.toFile "source" "42")') == 42 ]]
@ -29,6 +30,7 @@ nix-instantiate --eval -E 'assert 1 + 2 == 3; true'
[[ $(nix-instantiate -A attr --eval "./eval.nix") == '{ foo = "bar"; }' ]]
[[ $(nix-instantiate -A attr --eval --json "./eval.nix") == '{"foo":"bar"}' ]]
[[ $(nix-instantiate -A int --eval - < "./eval.nix") == 123 ]]
[[ $(nix-instantiate --eval -E '{"assert"=1;bar=2;}') == '{ "assert" = 1; bar = 2; }' ]]
# Check that symlink cycles don't cause a hang.
ln -sfn cycle.nix $TEST_ROOT/cycle.nix