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Versions: 31
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Contents
# Expands variables in a template string. Variables are prefixed with a $ sign
# and consist of word characters (letters, digits, underscores). The name can
# be enclosed in curly braces to avoid unintended expansions. The $ sign can be
# escaped with a backslash (\), and backslashes can be escaped with another
# backslash. All occurrences of a variable in the string are replaced
#
# The str argument is the template string and the variables argument is a hash
# from variable name (String) to variable value
#
# Note that the characters '\x00' and '\x01' are used internally and may not be
# present in the template string
#
def expand_variables(str, variables) # ChatGPT
# Replace escaped bashslashes and dollar signs
str = str.gsub('\\\\', "\x00").gsub('\\$', "\x01")
# Expand variables
str.gsub!(/\$(\w+)\b|\$\{(\w+)\}/) do |match| # Strange that '\b' is necessary
key = $1 || $2
# variables[key] || match
variables[key] || ""
end
# Restore escaped characters
str.gsub("\x00", '\\').gsub("\x01", '$')
end
# Return true if any of the variables will be expanded
def expand_variables?(str, variables)
# Replace escaped bashslashes and dollar signs
str = str.gsub('\\\\', "\x00").gsub('\\$', "\x01")
# Look for expansion
str.gsub!(/\$(\w+)\b|\$\{(\w+)\}/) do |match| # Strange that '\b' is necessary
return true if variables.include?($1 || $2)
end
return false
end
Version data entries
31 entries across 31 versions & 1 rubygems