waiig15/parser/parser_prefix.go

package parser

import (
	"code.osinet.fr/fgm/waiig15/ast"
)

func (p *Parser) parsePrefixExpression() ast.Expression {
	defer untrace(trace("parsePrefixExpression"))
	expression := &ast.PrefixExpression{
		Token:    p.curToken,
		Operator: p.curToken.Literal,
	}

	// Consume the operator token to progress to the prefixed expression.
	p.nextToken()

	// The precedence is now that of the prefix operator instead of the lowest.
	expression.Right = p.parseExpression(PREFIX)

	return expression
}