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author | Herbert Xu <herbert@gondor.apana.org.au> | 2018-03-09 00:14:02 +0800 |
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committer | Herbert Xu <herbert@gondor.apana.org.au> | 2018-03-22 00:29:58 +0800 |
commit | ab1cecb4047864afb247a6ed691e7f59ce716f2c (patch) | |
tree | 4e4914acd4854f273fa7da4af24f7b86c83672fd /src/mkbuiltins | |
parent | parser: use pgetc_eatbnl() in more places (diff) | |
download | dash-ab1cecb4047864afb247a6ed691e7f59ce716f2c.tar.gz dash-ab1cecb4047864afb247a6ed691e7f59ce716f2c.zip |
parser: Add syntax stack for recursive parsing
Without a stack of syntaxes we cannot correctly these two cases together: "${a#'$$'}" "${a#"${b-'$$'}"}" A recursive parser also helps in some other corner cases such as nested arithmetic expansion with paratheses. This patch adds a syntax stack allocated from the stack using alloca. As a side-effect this allows us to remove the naked backslashes for patterns within double-quotes, which means that EXP_QPAT also has to go. This patch also fixes removes any backslashes that precede right braces when they are present within a parameter expansion context, and backslashes that precede double quotes within inner double quotes inside a parameter expansion in a here-document context. The idea of a recursive parser is based on a patch by Harald van Dijk. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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