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# File 'lib/msgpack/idl/parser/rule.rb', line 450
def print_error(error, fname, out=STDERR)
error_tree = self.root.error_tree
last = error_tree
until last.children.empty?
last = last.children.last
end
last_cause = last.parslet.instance_eval('@last_cause')
source = last_cause.source
row, col = source.line_and_column(last_cause.pos)
old_pos = source.pos
begin
source.pos = last_cause.pos - col + 1
line, *after = source.read(AFTER_BUFFER).to_s.split("\n")
after = after[0,AFTER_LINES]
source.pos = last_cause.pos - col - BEFORE_BUFFER
before = source.read(BEFORE_BUFFER).to_s.split("\n")
before = before[-BEFORE_LINES,BEFORE_LINES] || []
ensure
source.pos = old_pos
end
if m = /[ \t\r\n]*/.match(line)
heading = m[0]
else
heading = ""
end
out.puts "syntax error:"
(
error.to_s.split("\n") +
error_tree.to_s.split("\n")
).each {|ln|
out.puts " "+ln
}
out.puts ""
out.puts "around line #{row} column #{heading.size}-#{col}:"
out.puts ""
before.each_with_index {|ln,i|
l = row - after.size - 1 + i
out.print LINE_HEAD_FORMAT % l
out.puts ln
}
out.print LINE_HEAD_FORMAT % row
out.puts line
out.print " "*LINE_HEAD_SIZE
out.puts heading + '^'*(col - heading.size)
after.each_with_index {|ln,i|
l = row + 1 + i
out.print LINE_HEAD_FORMAT % l
out.puts ln
}
out
end
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