Build a pattern rule — pattern

This is a specific type of rule. It can be used in the more general ruleset built with ast_rule().

Usage

pattern_rule(selector = NULL, context = NULL, strictness = "smart")

selector: Defines the surrounding code that helps to resolve any ambiguity in the syntax.
context: Defines the sub-syntax node kind that is the actual matcher of the pattern.
strictness: Optional, defines how strictly pattern will match against nodes. See 'Details'.

The strictness parameter defines the type of nodes the ast-grep matcher should consider. It has the following values:

cst: All nodes in the pattern and target code must be matched. No node is skipped.
smart: All nodes in the pattern must be matched, but it will skip unnamed nodes in target code. This is the default behavior.
ast: Only named AST nodes in both pattern and target code are matched. All unnamed nodes are skipped.
relaxed: Named AST nodes in both pattern and target code are matched. Comments and unnamed nodes are ignored.
signature: Only named AST nodes' kinds are matched. Comments, unnamed nodes and text are ignored.