waiig15/parser/parser_int.go

package parser

import (
	"fmt"
	"strconv"

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

func (p *Parser) parseIntegerLiteral() ast.Expression {
	defer untrace(trace("parseIntegerLiteral"))
	lit := &ast.IntegerLiteral{
		Token: p.curToken,
	}

	// Base 0 allows straight interpretation of octal 0755 or hex 0xABCD.
	value, err := strconv.ParseInt(p.curToken.Literal, 0, 64)
	if err != nil {
		msg := fmt.Sprintf("could not parse %q as integer",
			p.curToken.Literal)
		p.errors = append(p.errors, msg)
		return nil
	}

	lit.Value = value
	return lit
}