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Cache Frame#context results

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This commit is contained in:
Sijawusz Pur Rahnama 2021-01-03 17:04:59 +01:00
parent 0300476813
commit d88a17f3e6
1 changed files with 13 additions and 7 deletions
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8
src/backtracer/backtrace/frame.cr
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@ -1,6 +1,8 @@
module Backtracer
# An object representation of a stack frame.
struct Backtrace::Frame
@context_cache = {} of Int32 => Context
# The method of this frame (such as `User.find`).
getter method : String
@ -109,8 +111,11 @@ module Backtracer
# See `Configuration#context_lines`
def context(context_lines : Int32? = nil) : Context?
context_lines ||= configuration.context_lines
return unless context_lines && (context_lines > 0)
cached = @context_cache[context_lines]?
return cached if cached
return unless (lineno = @lineno) && (lineno > 0)
return unless (path = @path) && File.readable?(path)
@ -121,6 +126,7 @@ module Backtracer
pre_context = lines[Math.max(0, lineidx - context_lines), context_lines]
post_context = lines[Math.min(lines.size, lineidx + 1), context_lines]
@context_cache[context_lines] =
Context.new(
lineno: lineno,
pre: pre_context,