stonewareslord/zsh-syntax-highlighting
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'main': Fix an infinite loop.

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On the test case, the behaviour was as follows:

+highlighters/main/main-highlighter.zsh:733> _zsh_highlight_main_highlighter__try_expand_parameter '$1'
+highlighters/main/main-highlighter.zsh:432> local arg='$1'
+highlighters/main/main-highlighter.zsh:433> unset reply
+highlighters/main/main-highlighter.zsh:439> local -a match mbegin mend
+highlighters/main/main-highlighter.zsh:440> local MATCH
+highlighters/main/main-highlighter.zsh:440> integer MBEGIN MEND
+highlighters/main/main-highlighter.zsh:441> local parameter_name
+highlighters/main/main-highlighter.zsh:442> local -a words
+highlighters/main/main-highlighter.zsh:443> [[ '$' != \$ ]]
+highlighters/main/main-highlighter.zsh:446> [[ 1 == { ]]
+highlighters/main/main-highlighter.zsh:449> parameter_name=1
+highlighters/main/main-highlighter.zsh:451> [[ none == none ]]
+highlighters/main/main-highlighter.zsh:451> zmodload -e zsh/parameter
+highlighters/main/main-highlighter.zsh:452> [[ ${parameter_name} -regex-match ^${~parameter_name_pattern}$ ]]
+highlighters/main/main-highlighter.zsh:453> [[ '' != *special* ]]
+highlighters/main/main-highlighter.zsh:456> case array-special (*array*|*assoc*)
+highlighters/main/main-highlighter.zsh:458> words=( '$1' )
+highlighters/main/main-highlighter.zsh:469> reply=( '$1' )

There are two problems here:

- In terms of _zsh_highlight_main_highlighter__try_expand_parameter's
  pre- and postconditions, the expansion of the word «$1» (line 733)
  included that same word (line 469).

  That happened because word-to-be-expanded is passed to
  _zsh_highlight_main_highlighter__try_expand_parameter as its first
  positional parameter, and in this case the word happened to be «$1».

- Furthermore, the exclusion of special parameters (line 453) false
  negatived.  That happened because $parameter_name_pattern explicitly
  allows positional parameters, but ${parameters[(e)1]} expands to
  nothing.  This will be fixed in the next commit.

Not a regression from 0.7.1.
This commit is contained in:
Daniel Shahaf 2020-04-02 23:32:28 +00:00
parent 90fec4d658
commit 2a30d4fb5a
1 changed files with 1 additions and 1 deletions
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2
highlighters/main/main-highlighter.zsh
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@ -730,7 +730,7 @@ _zsh_highlight_main_highlighter_highlight_list()
fi
# Expand parameters.
if _zsh_highlight_main_highlighter__try_expand_parameter "$arg"; then
if (( ! in_param )) && _zsh_highlight_main_highlighter__try_expand_parameter "$arg"; then
# That's not entirely correct --- if the parameter's value happens to be a reserved
# word, the parameter expansion will be highlighted as a reserved word --- but that
# incorrectness is outweighed by the usability improvement of permitting the use of