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|
# `assert_regex`
#
# This function is similar to `assert_equal` but uses pattern matching instead
# of equality, by wrapping `[[ value =~ pattern ]]`.
#
# Fail if the value (first parameter) does not match the pattern (second
# parameter).
#
# ```bash
# @test 'assert_regex()' {
# assert_regex 'what' 'x$'
# }
# ```
#
# On failure, the value and the pattern are displayed.
#
# ```
# -- values does not match regular expression --
# value : what
# pattern : x$
# --
# ```
#
# If the value is longer than one line then it is displayed in *multi-line*
# format.
#
# An error is displayed if the specified extended regular expression is invalid.
#
# For description of the matching behavior, refer to the documentation of the
# `=~` operator in the
# [Bash manual]: https://www.gnu.org/software/bash/manual/html_node/Conditional-Constructs.html.
# Note that the `BASH_REMATCH` array is available immediately after the
# assertion succeeds but is fragile, i.e. prone to being overwritten as a side
# effect of other actions.
assert_regex() {
local -r value="${1}"
local -r pattern="${2}"
if [[ '' =~ ${pattern} ]] || (( ${?} == 2 )); then
echo "Invalid extended regular expression: \`${pattern}'" \
| batslib_decorate 'ERROR: assert_regex' \
| fail
elif ! [[ "${value}" =~ ${pattern} ]]; then
if shopt -p nocasematch &>/dev/null; then
local case_sensitive=insensitive
else
local case_sensitive=sensitive
fi
batslib_print_kv_single_or_multi 8 \
'value' "${value}" \
'pattern' "${pattern}" \
'case' "${case_sensitive}" \
| batslib_decorate 'value does not match regular expression' \
| fail
fi
}
|
