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Add a Rules.Merge() helper function.

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Might be useful for #363.
This commit is contained in:
Alec Thomas 2020-05-16 16:04:08 +10:00
parent 4065717136
commit ee4284bb40
1 changed files with 9 additions and 0 deletions
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9
regexp.go
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@ -170,6 +170,15 @@ func (r Rules) Clone() Rules {
return out return out
} }
// Merge creates a clone of "r" then merges "rules" into the clone.
func (r Rules) Merge(rules Rules) Rules {
out := r.Clone()
for k, v := range rules.Clone() {
out[k] = v
}
return out
}
// MustNewLexer creates a new Lexer or panics. // MustNewLexer creates a new Lexer or panics.
func MustNewLexer(config *Config, rules Rules) *RegexLexer { func MustNewLexer(config *Config, rules Rules) *RegexLexer {
lexer, err := NewLexer(config, rules) lexer, err := NewLexer(config, rules)