Module: LineCache
- Defined in:
- lib/linecache.rb,
lib/linecache/version.rb
Overview
module LineCache
A module to read and cache lines of a Ruby program.
Defined Under Namespace
Classes: LineCacheInfo
Constant Summary collapse
- VERSION =
'1.3.1'
- @@file_cache =
The file cache. The key is a name as would be given by Ruby for __FILE__. The value is a LineCacheInfo object.
{}
- @@script_cache =
{}
- @@ruby_highlighter =
Used for CodeRay syntax highlighting
nil
- @@file2file_remap =
Maps a string filename (a String) to a key in @@file_cache (a String).
One important use of @@file2file_remap is mapping the a full path of a file into the name stored in @@file_cache or given by Ruby’s __FILE__. Applications such as those that get input from users, may want canonicalize a file name before looking it up. This map gives a way to do that.
Another related use is when a template system is used. Here we’ll probably want to remap not only the file name but also line ranges. Will probably use this for that, but I’m not sure.
{}
- @@file2file_remap_lines =
{}
- @@script2file =
{}
Class Method Summary collapse
-
.cache(filename, reload_on_change = false) ⇒ Object
Older routine - for compability.
-
.cache_file(filename, reload_on_change = false, opts = {}) ⇒ Object
Cache filename if it’s not already cached.
-
.cache_script(script, opts = {}) ⇒ Object
Cache script if it’s not already cached.
-
.cached?(file_or_script) ⇒ Boolean
Return true if file_or_script is cached.
-
.cached_files ⇒ Object
Return an array of cached file names.
- .cached_script?(filename) ⇒ Boolean
-
.checkcache(filename = nil, opts = false) ⇒ Object
Discard cache entries that are out of date.
-
.clear_file_cache(filename = nil) ⇒ Object
Clear the file cache.
-
.clear_file_format_cache ⇒ Object
Remove syntax-formatted lines in the cache.
-
.clear_script_cache ⇒ Object
Clear the script cache entirely.
- .empty?(filename) ⇒ Boolean
-
.getline(file_or_script, line_number, opts = true) ⇒ Object
Get line
line_number
from file namedfilename
. -
.getlines(filename, opts = false) ⇒ Object
Read lines of
filename
and cache the results. - .highlight_string(string, output_type) ⇒ Object
-
.path(filename) ⇒ Object
Return full filename path for filename.
- .remap_file(from_file, to_file) ⇒ Object
- .remap_file_lines(from_file, to_file, range, start) ⇒ Object
- .remove_script_temps ⇒ Object
-
.sha1(filename) ⇒ Object
Return SHA1 of filename.
-
.size(file_or_script) ⇒ Object
Return the number of lines in filename.
-
.stat(filename) ⇒ Object
Return File.stat in the cache for filename.
-
.trace_line_numbers(filename, reload_on_change = false) ⇒ Object
Return an Array of breakpoints in filename.
- .unmap_file(file) ⇒ Object (also: map_file)
- .unmap_file_line(file, line) ⇒ Object
-
.update_cache(filename, opts = false) ⇒ Object
Update a cache entry.
-
.update_script_cache(script, opts) ⇒ Object
Update a cache entry.
Class Method Details
.cache(filename, reload_on_change = false) ⇒ Object
Older routine - for compability. Cache filename if it’s not already cached. Return the expanded filename for it in the cache or nil if we can’t find the file.
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# File 'lib/linecache.rb', line 231 def cache(filename, reload_on_change=false) if @@file_cache.member?(filename) checkcache(filename) if reload_on_change else update_cache(filename, true) end if @@file_cache.member?(filename) @@file_cache[filename].path else nil end end |
.cache_file(filename, reload_on_change = false, opts = {}) ⇒ Object
Cache filename if it’s not already cached. Return the expanded filename for it in the cache or nil if we can’t find the file.
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# File 'lib/linecache.rb', line 213 def cache_file(filename, reload_on_change=false, opts={}) if @@file_cache.member?(filename) checkcache(filename) if reload_on_change else opts[:use_script_lines] = true update_cache(filename, opts) end if @@file_cache.member?(filename) @@file_cache[filename].path else nil end end |
.cache_script(script, opts = {}) ⇒ Object
Cache script if it’s not already cached.
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# File 'lib/linecache.rb', line 203 def cache_script(script, opts={}) if !@@script_cache.member?(script) update_script_cache(script, opts) end script end |
.cached?(file_or_script) ⇒ Boolean
Return true if file_or_script is cached
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# File 'lib/linecache.rb', line 245 def cached?(file_or_script) if file_or_script.kind_of?(String) @@file_cache.member?(unmap_file(file_or_script)) else cached_script?(file_or_script) end end |
.cached_files ⇒ Object
Return an array of cached file names
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# File 'lib/linecache.rb', line 154 def cached_files() @@file_cache.keys end |
.cached_script?(filename) ⇒ Boolean
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# File 'lib/linecache.rb', line 253 def cached_script?(filename) SCRIPT_LINES__.member?(unmap_file(filename)) end |
.checkcache(filename = nil, opts = false) ⇒ Object
Discard cache entries that are out of date. If filename
is nil
all entries in the file cache @@file_cache are checked. If we don’t have stat information about a file, which can happen if the file was read from __SCRIPT_LINES but no corresponding file is found, it will be kept. Return a list of invalidated filenames. nil is returned if a filename was given but not found cached.
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# File 'lib/linecache.rb', line 164 def checkcache(filename=nil, opts=false) use_script_lines = if opts.kind_of?(Hash) opts[:use_script_lines] else opts end if !filename filenames = @@file_cache.keys() elsif @@file_cache.member?(filename) filenames = [filename] else return nil end result = [] for filename in filenames next unless @@file_cache.member?(filename) path = @@file_cache[filename].path if File.exist?(path) cache_info = @@file_cache[filename].stat stat = File.stat(path) if cache_info if stat && (cache_info.size != stat.size or cache_info.mtime != stat.mtime) result << filename update_cache(filename, opts) end else result << filename update_cache(filename, opts) end end end return result end |
.clear_file_cache(filename = nil) ⇒ Object
Clear the file cache. If no filename is given clear it entirely. if a filename is given, clear just that filename.
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# File 'lib/linecache.rb', line 110 def clear_file_cache(filename=nil) if filename if @@file_cache[filename] @@file_cache.delete(filename) end else @@file_cache = {} @@file2file_remap = {} @@file2file_remap_lines = {} end end |
.clear_file_format_cache ⇒ Object
Remove syntax-formatted lines in the cache. Use this when you change the CodeRay syntax or Token formatting and want to redo how files may have previously been syntax marked.
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# File 'lib/linecache.rb', line 126 def clear_file_format_cache @@file_cache.each_pair do |fname, cache_info| cache_info.lines.each_pair do |format, lines| next if :plain == format @@file_cache[fname].lines[format] = nil end end end |
.clear_script_cache ⇒ Object
Clear the script cache entirely.
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# File 'lib/linecache.rb', line 149 def clear_script_cache() @@script_cache = {} end |
.empty?(filename) ⇒ Boolean
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# File 'lib/linecache.rb', line 257 def empty?(filename) filename=unmap_file(filename) !!@@file_cache[filename].lines[:plain] end |
.getline(file_or_script, line_number, opts = true) ⇒ Object
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# File 'lib/linecache.rb', line 273 def getline(file_or_script, line_number, opts=true) reload_on_change = if opts.kind_of?(Hash) opts[:reload_on_change] else opts end lines = if file_or_script.kind_of?(String) filename = unmap_file(file_or_script) filename, line_number = unmap_file_line(filename, line_number) getlines(filename, opts) else script_getlines(file_or_script) end if lines and (1..lines.size) === line_number return lines[line_number-1] else return nil end end |
.getlines(filename, opts = false) ⇒ Object
Read lines of filename
and cache the results. However filename
was previously cached use the results from the cache. Return nil if we can’t get lines
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# File 'lib/linecache.rb', line 298 def getlines(filename, opts=false) if opts.kind_of?(Hash) reload_on_change, use_script_lines = [opts[:reload_on_change], opts[:use_script_lines]] else reload_on_change, use_script_lines = [opts, false] opts = {:reload_on_change => reload_on_change} end checkcache(filename) if reload_on_change format = opts[:output] || :plain if @@file_cache.member?(filename) lines = @@file_cache[filename].lines if opts[:output] && !lines[format] lines[format] = highlight_string(lines[:plain].join(''), format).split(/\n/) end return lines[format] else opts[:use_script_lines] = true update_cache(filename, opts) if @@file_cache.member?(filename) return @@file_cache[filename].lines[format] else return nil end end end |
.highlight_string(string, output_type) ⇒ Object
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# File 'lib/linecache.rb', line 326 def highlight_string(string, output_type) require 'rubygems' begin require 'coderay' require 'term/ansicolor' rescue LoadError return string end @@ruby_highlighter ||= CodeRay::Duo[:ruby, output_type] @@ruby_highlighter.encode(string) end |
.path(filename) ⇒ Object
Return full filename path for filename
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# File 'lib/linecache.rb', line 339 def path(filename) return unless filename.kind_of?(String) filename = unmap_file(filename) return nil unless @@file_cache.member?(filename) @@file_cache[filename].path end |
.remap_file(from_file, to_file) ⇒ Object
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# File 'lib/linecache.rb', line 346 def remap_file(from_file, to_file) @@file2file_remap[from_file] = to_file cache_file(to_file) end |
.remap_file_lines(from_file, to_file, range, start) ⇒ Object
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# File 'lib/linecache.rb', line 351 def remap_file_lines(from_file, to_file, range, start) range = (range..range) if range.kind_of?(Fixnum) to_file = from_file unless to_file if @@file2file_remap_lines[to_file] # FIXME: need to check for overwriting ranges: whether # they intersect or one encompasses another. @@file2file_remap_lines[to_file] << [from_file, range, start] else @@file2file_remap_lines[to_file] = [[from_file, range, start]] end end |
.remove_script_temps ⇒ Object
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# File 'lib/linecache.rb', line 100 def remove_script_temps @@script2file.values.each do |filename| File.unlink(filename) if File.exist?(filename) end end |
.sha1(filename) ⇒ Object
Return SHA1 of filename.
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# File 'lib/linecache.rb', line 365 def sha1(filename) filename = unmap_file(filename) return nil unless @@file_cache.member?(filename) return @@file_cache[filename].sha1.hexdigest if @@file_cache[filename].sha1 sha1 = Digest::SHA1.new @@file_cache[filename].lines[:plain].each do |line| sha1 << line + "\n" end @@file_cache[filename].sha1 = sha1 sha1.hexdigest end |
.size(file_or_script) ⇒ Object
Return the number of lines in filename
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# File 'lib/linecache.rb', line 379 def size(file_or_script) cache(file_or_script) if file_or_script.kind_of?(String) file_or_script = unmap_file(file_or_script) return nil unless @@file_cache.member?(file_or_script) @@file_cache[file_or_script].lines[:plain].length else return nil unless @@script_cache.member?(file_or_script) @@script_cache[file_or_script].lines[:plain].length end end |
.stat(filename) ⇒ Object
Return File.stat in the cache for filename.
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# File 'lib/linecache.rb', line 392 def stat(filename) return nil unless @@file_cache.member?(filename) @@file_cache[filename].stat end |
.trace_line_numbers(filename, reload_on_change = false) ⇒ Object
Return an Array of breakpoints in filename. The list will contain an entry for each distinct line event call so it is possible (and possibly useful) for a line number appear more than once.
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# File 'lib/linecache.rb', line 402 def trace_line_numbers(filename, reload_on_change=false) fullname = cache(filename, reload_on_change) return nil unless fullname e = @@file_cache[filename] unless e.line_numbers e.line_numbers = TraceLineNumbers.lnums_for_str_array(e.lines[:plain]) e.line_numbers = false unless e.line_numbers end e.line_numbers end |
.unmap_file(file) ⇒ Object Also known as: map_file
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# File 'lib/linecache.rb', line 414 def unmap_file(file) @@file2file_remap[file] ? @@file2file_remap[file] : file end |
.unmap_file_line(file, line) ⇒ Object
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# File 'lib/linecache.rb', line 419 def unmap_file_line(file, line) if @@file2file_remap_lines[file] @@file2file_remap_lines[file].each do |from_file, range, start| if range === line from_file = from_file || file return [from_file, start+line-range.begin] end end end return [file, line] end |
.update_cache(filename, opts = false) ⇒ Object
Update a cache entry. If something’s wrong, return nil. Return true if the cache was updated and false if not. If use_script_lines is true, use that as the source for the lines of the file
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# File 'lib/linecache.rb', line 449 def update_cache(filename, opts=false) if opts.kind_of?(Hash) use_script_lines = opts[:use_script_lines] else use_script_lines = opts opts = {:use_script_lines => use_script_lines} end return nil unless filename @@file_cache.delete(filename) path = File.(filename) if use_script_lines list = [filename] list << @@file2file_remap[path] if @@file2file_remap[path] list.each do |name| if !SCRIPT_LINES__[name].nil? && SCRIPT_LINES__[name] != true begin stat = File.stat(name) rescue stat = nil end raw_lines = SCRIPT_LINES__[name] lines = {:plain => raw_lines} lines[opts[:output]] = highlight_string(raw_lines.join, opts[:output]).split(/\n/) if opts[:output] @@file_cache[filename] = LineCacheInfo.new(stat, nil, lines, path, nil) @@file2file_remap[path] = filename return true end end end if File.exist?(path) stat = File.stat(path) elsif File.basename(filename) == filename # try looking through the search path. stat = nil for dirname in $: path = File.join(dirname, filename) if File.exist?(path) stat = File.stat(path) break end end return false unless stat end begin # (GF) rewind does not work in JRuby with a jar:file:... filename # (GF) read file once and only create string if required by opts[:output] lines = { :plain => File.readlines(path) } if opts[:output] lines[opts[:output]] = highlight_string(lines[:plain].join, opts[:output]).split(/\n/) end rescue ## print '*** cannot open', path, ':', msg return nil end @@file_cache[filename] = LineCacheInfo.new(File.stat(path), nil, lines, path, nil) @@file2file_remap[path] = filename return true end |
.update_script_cache(script, opts) ⇒ Object
Update a cache entry. If something is wrong, return nil. Return true if the cache was updated and false if not.
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# File 'lib/linecache.rb', line 433 def update_script_cache(script, opts) # return false unless script_is_eval?(script) # string = opts[:string] || script.eval_source lines = {:plain => string.split(/\n/)} lines[opts[:output]] = highlight_string(string, opts[:output]) if opts[:output] @@script_cache[script] = LineCacheInfo.new(nil, nil, lines, nil, opts[:sha1], opts[:compiled_method]) return true end |