https://github.com/mvdan/gogrep

Search for Go code using syntax trees
https://github.com/mvdan/gogrep

code go search syntax

Last synced: about 1 month ago
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Search for Go code using syntax trees

• Host: GitHub
• URL: https://github.com/mvdan/gogrep
• Owner: mvdan
• License: bsd-3-clause
• Archived: true
• Created: 2017-09-17T11:49:23.000Z (about 7 years ago)
• Default Branch: master
• Last Pushed: 2021-06-09T09:03:30.000Z (over 3 years ago)
• Last Synced: 2024-08-03T17:17:08.744Z (4 months ago)
• Topics: code, go, search, syntax
• Language: Go
• Homepage:
• Size: 250 KB
• Stars: 475
• Watchers: 11
• Forks: 16
• Open Issues: 15
• Metadata Files:
  • Readme: README.md
  • Funding: .github/FUNDING.yml
  • License: LICENSE

Awesome Lists containing this project

• go-awesome - gogrep - Browse the Go source code using the syntax tree (Open source library / Word Processing)

README

        
# gogrep

	GO111MODULE=on go get mvdan.cc/gogrep

Search for Go code using syntax trees.

	gogrep -x 'if $x != nil { return $x, $*_ }'

Note that this project is **no longer being developed**.

See https://github.com/mvdan/gogrep/issues/64 for more details.

### Instructions

	usage: gogrep commands [packages]

A command is of the form "-A pattern", where -A is one of:

       -x  find all nodes matching a pattern

       -g  discard nodes not matching a pattern

       -v  discard nodes matching a pattern

       -a  filter nodes by certain attributes

       -s  substitute with a given syntax tree

       -w  write source back to disk or stdout

A pattern is a piece of Go code which may include wildcards. It can be:

       a statement (many if split by semicolons)

       an expression (many if split by commas)

       a type expression

       a top-level declaration (var, func, const)

       an entire file

Wildcards consist of `$` and a name. All wildcards with the same name

within an expression must match the same node, excluding "_". Example:

       $x.$_ = $x // assignment of self to a field in self

If `*` is before the name, it will match any number of nodes. Example:

       fmt.Fprintf(os.Stdout, $*_) // all Fprintfs on stdout

`*` can also be used to match optional nodes, like:

	for $*_ { $*_ }    // will match all for loops

	if $*_; $b { $*_ } // will match all ifs with condition $b

The nodes resulting from applying the commands will be printed line by

line to standard output.

Here are two simple examples of the -a operand:

       gogrep -x '$x + $y'                   // will match both numerical and string "+" operations

       gogrep -x '$x + $y' -a 'type(string)' // matches only string concatenations