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module Slim
# In Slim you don't need to close any blocks:
#
# - if Slim.awesome?
# | But of course it is!
#
# However, the parser is not smart enough (and that's a good thing) to
# automatically insert end's where they are needed. Luckily, this filter
# does *exactly* that (and it does it well!)
#
# @api private
class EndInserter < Filter
ELSE_REGEX = /^else|elsif|when\b/
END_REGEX = /^end\b/
# Handle multi expression `[:multi, *exps]`
def on_multi(*exps)
result = [:multi]
# This variable is true if the previous line was
# (1) a control code and (2) contained indented content.
prev_indent = false
exps.each do |exp|
if control?(exp)
raise 'Explicit end statements are forbidden' if exp[2] =~ END_REGEX
# Two control code in a row. If this one is *not*
# an else block, we should close the previous one.
append_end(result) if prev_indent && exp[2] !~ ELSE_REGEX
# Indent if the control code contains something.
prev_indent = !empty_exp?(exp[3])
elsif exp[0] != :newline && prev_indent
# This is *not* a control code, so we should close the previous one.
# Ignores newlines because they will be inserted after each line.
append_end(result)
prev_indent = false
end
result << compile!(exp)
end
# The last line can be a control code too.
prev_indent ? append_end(result) : result
end
private
# Appends an end.
def append_end(result)
result << [:block, 'end']
end
# Checks if an expression is a Slim control code.
def control?(exp)
exp[0] == :slim && exp[1] == :control
end
end
end
Version data entries
13 entries across 13 versions & 1 rubygems