Method registerPrefix

pkg/dsl/parser/parser.go:825–837

registerPrefix safely registers a parsing function for a prefix token type in the parser's prefixParseFns map. It takes a token type and a prefix parsing function as arguments, and stores the function in the map under the given token type key.

(tokenType token.Type, fn prefixParseFn)

// It takes a token type and a prefix parsing function as arguments, and stores the function in the map
// under the given token type key.
func (p *Parser) registerPrefix(tokenType token.Type, fn prefixParseFn) {
	if fn == nil {
		p.duplicationError(fmt.Sprintf("registerPrefix: nil function for token type %s", tokenType))
		return
	}

	if _, exists := p.prefixParseFns[tokenType]; exists {
		p.duplicationError(fmt.Sprintf("registerPrefix: token type %s already registered", tokenType))
		return
	}

	p.prefixParseFns[tokenType] = fn
}

// registerInfix safely registers a parsing function for an infix token type in the parser's infixParseFunc map.
// It takes a token type and an infix parsing function as arguments, and stores the function in the map