Eclipse Community Forums: TMF (Xtext) » Infinite loop in UI internal ANTLR parser

Help

Home

Home » Modeling » TMF (Xtext) » Infinite loop in UI internal ANTLR parser

Show: Today's Messages :: Show Polls :: Message Navigator

Infinite loop in UI internal ANTLR parser [message #1214481]

Wed, 27 November 2013 18:19

Christian Mauceri

Messages: 22
Registered: May 2012
Location: Paris

Junior Member

Hi, the ANTLR UI parser I get with the attached grammar enters an infinite loop when I call the content assist.
I put trace in the internal parser before calling each DFA and I cycle on rule__Block__Alternatives_2 as shown below, any idea why ? The line number printed by dfa70.getDescription() does not correspond to anything meaningful to me.
Any help would be really appreciated.
The input fragment corresponding to the loop is :

package test.base;
import model.A;

public class Urlu {
public static int zabab = 1;
public static String azba = "aaa";
public Urlu() {
A aa = new A();
int arbou = 1 ;

I should add the resulting parser java class is very huge, 190000 lines.

dfa70 9227:1: rule__Block__Alternatives_2 : ( ( ( rule__Block__Group_2_0__0 ) ) | ( ( rule__Block__ExpressionsAssignment_2_1 ) ) | ( ( rule__Block__ExpressionsAssignment_2_2 ) ) | ( ( rule__Block__ExpressionsAssignment_2_3 ) ) | ( ( rule__Block__ExpressionsAssignment_2_4 ) ) | ( ( rule__Block__ExpressionsAssignment_2_5 ) ) | ( ( rule__Block__ExpressionsAssignment_2_6 ) ) | ( ( rule__Block__ExpressionsAssignment_2_7 ) ) | ( ( rule__Block__ExpressionsAssignment_2_8 ) ) | ( ( rule__Block__ExpressionsAssignment_2_9 ) ) | ( ( rule__Block__ExpressionsAssignment_2_10 ) ) | ( ( rule__Block__ExpressionsAssignment_2_11 ) ) | ( ( rule__Block__ExpressionsAssignment_2_12 ) ) | ( ( rule__Block__ExpressionsAssignment_2_13 ) ) | ( ( rule__Block__ExpressionsAssignment_2_14 ) ) | ( ( rule__Block__ExpressionsAssignment_2_15 ) ) );
dfa70 9227:1: rule__Block__Alternatives_2 : ( ( ( rule__Block__Group_2_0__0 ) ) | ( ( rule__Block__ExpressionsAssignment_2_1 ) ) | ( ( rule__Block__ExpressionsAssignment_2_2 ) ) | ( ( rule__Block__ExpressionsAssignment_2_3 ) ) | ( ( rule__Block__ExpressionsAssignment_2_4 ) ) | ( ( rule__Block__ExpressionsAssignment_2_5 ) ) | ( ( rule__Block__ExpressionsAssignment_2_6 ) ) | ( ( rule__Block__ExpressionsAssignment_2_7 ) ) | ( ( rule__Block__ExpressionsAssignment_2_8 ) ) | ( ( rule__Block__ExpressionsAssignment_2_9 ) ) | ( ( rule__Block__ExpressionsAssignment_2_10 ) ) | ( ( rule__Block__ExpressionsAssignment_2_11 ) ) | ( ( rule__Block__ExpressionsAssignment_2_12 ) ) | ( ( rule__Block__ExpressionsAssignment_2_13 ) ) | ( ( rule__Block__ExpressionsAssignment_2_14 ) ) | ( ( rule__Block__ExpressionsAssignment_2_15 ) ) );
d

Attachment: GenerateIROS.mwe2
(Size: 4.96KB, Downloaded 96 times)
Attachment: IROS.xtext
(Size: 41.73KB, Downloaded 101 times)