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module SlimLint::Filters
# Traverses a Temple S-expression (that has already been converted to
# {SlimLint::Sexp} instances) and annotates them with line numbers.
#
# This is a hack that allows us to access line information directly from the
# S-expressions, which makes a lot of other tasks easier.
class InjectLineNumbers < Temple::Filter
# {Sexp} representing a newline.
NEWLINE_SEXP = SlimLint::Sexp.new([:newline])
# Annotates the given {SlimLint::Sexp} with line number information.
#
# @param sexp [SlimLint::Sexp]
# @return [SlimLint::Sexp]
def call(sexp)
@line_number = 1
traverse(sexp)
sexp
end
private
# Traverses an {Sexp}, annotating it with line numbers.
#
# @param sexp [SlimLint::Sexp]
def traverse(sexp)
sexp.line = @line_number
case sexp
when SlimLint::Atom
@line_number += sexp.strip.count("\n") if sexp.respond_to?(:count)
when NEWLINE_SEXP
@line_number += 1
else
sexp.each do |nested_sexp|
traverse(nested_sexp)
end
end
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems