Infinite loop when import ietf-alarms.yang

[jcourington]

When I try to import the ietf-alarms.yang model the parser goes into an infinite loop. This is a yang 1.1 model

https://datatracker.ietf.org/doc/draft-ietf-ccamp-alarm-module/ https://tools.ietf.org/html/draft-ietf-ccamp-alarm-module-09

var util = require('util');
var fs = require('fs');
var yang = require('yang-js');

yang.import('ietf-alarms.yang');

[Vafa-Andalibi]

Have you imported ietf-yang-types? from what I see, alarm is importing that and yang-js is saying:

The pre-load approach is iterative in that you would need to ensure dependency YANG modules are loaded in the proper order of the nested dependency chain.

[Vafa-Andalibi]

Any update on this @jcourington? I can reproduce this using basically any Yang file that is importing dependencies. An example would be ietf-packet-fields which is importing ietf-inet-types, ietf-yang-types and ietf-ethertypes.

I tried to import the ietf-packet-fields both using Yang.import and require method and both will result in an infinite loop:

Yang.import("ietf-packet-fields");
Thrown:
RangeError: Maximum call stack size exceeded
    at Function.Yang.import (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/node.js:97:17)
    at Function.Yang.import (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/node.js:104:34)
    at Function.Yang.import (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/node.js:116:29)
    at Function.Yang.import (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/node.js:116:29)
    at Function.Yang.import (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/node.js:116:29)
    at Function.Yang.import (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/node.js:116:29)
    at Function.Yang.import (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/node.js:116:29)
    at Function.Yang.import (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/node.js:116:29)
    at Function.Yang.import (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/node.js:116:29)
    at Function.Yang.import (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/node.js:116:29)

Edit: I'm testing this on MacOS Mojave btw

[sekur]

@Vafa-Andalibi - can you try to enable yang debug and share some of the final tidbits causing the inifinite loop?

$ DEBUG=yang* node
> const Yang = require('yang-js');
> Yang.import("ietf-packet-fields");

Thanks.

[Vafa-Andalibi]

Here's a output including two "batch" of error lines:

yang:schema [resolve] ietf-packet-fields in /Users/XXXX/gitrepos/yang-js/test/nodetest/package.json +1m
  yang:schema [resolve] ietf-packet-fields in /Users/XXXX/gitrepos/yang-js/test/package.json +1ms
  yang:schema [resolve] ietf-packet-fields in /Users/XXXX/gitrepos/yang-js/package.json +1ms
  yang:schema [resolve] ietf-packet-fields in /Users/XXXX/gitrepos/package.json +1ms
  yang:schema [resolve] ietf-packet-fields in /Users/XXXX/package.json +0ms
  yang:schema [resolve] ietf-packet-fields in /Users/package.json +0ms
  yang:schema [resolve] checking if /Users/XXXX/gitrepos/yang-js/test/nodetest/ietf-packet-fields.yang exists +1ms
  yang:schema [import(ietf-inet-types)] { prefix: '1', 'revision-date': '0..1' } +29ms
  yang:node ExpressionError: [import(ietf-inet-types)] scope violation - invalid 'reference' extension found
  yang:node     at Function.Element.error (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/element.js:60:15)
  yang:node     at Function.Expression.error (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/expression.js:191:40)
  yang:node     at Function.Element.merge (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/element.js:308:22)
  yang:node     at Function.Yang.merge (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/yang.js:352:39)
  yang:node     at /Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/element.js:244:24
  yang:node     at Array.forEach (<anonymous>)
  yang:node     at Function.Element.extends (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/element.js:242:13)
  yang:node     at Function.Yang.parse (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/yang.js:76:48)
  yang:node     at /Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/yang.js:78:24
  yang:node     at Array.map (<anonymous>) +1m
  yang:schema [resolve] ietf-inet-types in /Users/XXXX/gitrepos/yang-js/test/nodetest/package.json +0ms
  yang:schema [resolve] ietf-inet-types in /Users/XXXX/gitrepos/yang-js/test/package.json +1ms
  yang:schema [resolve] ietf-inet-types in /Users/XXXX/gitrepos/yang-js/package.json +0ms
  yang:schema [resolve] ietf-inet-types check ./schema/ietf-inet-types.yang in /Users/XXXX/gitrepos/yang-js +0ms
  yang:schema [resolve] checking if /Users/XXXX/gitrepos/yang-js/schema/ietf-inet-types.yang exists +0ms
  yang:schema [module(ietf-inet-types)] [compile] enter... (undefined) +19ms
  yang:schema [module(ietf-inet-types)] has sub-expressions: namespace,prefix,organization,contact,description,revision,revision,typedef,typedef,typedef,typedef,typedef,typedef,typedef,typedef,typedef,typedef,typedef,typedef,typedef,typedef,typedef,typedef,typedef +0ms
  yang:schema [module(ietf-inet-types)/namespace(urn:ietf:params:xml:ns:yang:ietf-inet-types)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/namespace(urn:ietf:params:xml:ns:yang:ietf-inet-types)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/prefix] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/prefix] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/organization] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/organization] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/contact] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/contact] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/description] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/description] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/revision(2013-07-15)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/revision(2013-07-15)] has sub-expressions: description,reference +1ms
  yang:schema [module(ietf-inet-types)/revision(2013-07-15)/description] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/revision(2013-07-15)/description] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/revision(2013-07-15)/reference] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/revision(2013-07-15)/reference] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/revision(2013-07-15)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/revision(2010-09-24)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/revision(2010-09-24)] has sub-expressions: description,reference +0ms
  yang:schema [module(ietf-inet-types)/revision(2010-09-24)/description] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/revision(2010-09-24)/description] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/revision(2010-09-24)/reference] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/revision(2010-09-24)/reference] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/revision(2010-09-24)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)] [compile] enter... (undefined) +4ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)] has sub-expressions: enum,enum,enum +1ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(unknown)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(unknown)] has sub-expressions: value,description +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(unknown)/value] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(unknown)/value] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(unknown)/description] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(unknown)/description] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(unknown)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv4)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv4)] has sub-expressions: value,description +1ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv4)/value] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv4)/value] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv4)/description] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv4)/description] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv4)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv6)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv6)] has sub-expressions: value,description +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv6)/value] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv6)/value] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv6)/description] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv6)/description] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv6)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)] has sub-expressions: type,description,reference +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)] has sub-expressions: enum,enum,enum +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(unknown)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(unknown)] has sub-expressions: value,description +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(unknown)/value] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(unknown)/value] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(unknown)/description] [compile] enter... (true) +1ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(unknown)/description] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(unknown)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv4)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv4)] has sub-expressions: value,description +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv4)/value] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv4)/value] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv4)/description] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv4)/description] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv4)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv6)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv6)] has sub-expressions: value,description +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv6)/value] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv6)/value] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv6)/description] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv6)/description] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)/enum(ipv6)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/type(enumeration)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/description] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/description] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/reference] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)/reference] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-version)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(dscp)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(dscp)/type(uint8)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(dscp)/type(uint8)] has sub-expressions: range +1ms
  yang:schema [module(ietf-inet-types)/typedef(dscp)/type(uint8)/range] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(dscp)/type(uint8)/range] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(dscp)/type(uint8)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(dscp)] has sub-expressions: type,description,reference +0ms
  yang:schema [module(ietf-inet-types)/typedef(dscp)/type(uint8)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(dscp)/type(uint8)] has sub-expressions: range +0ms
  yang:schema [module(ietf-inet-types)/typedef(dscp)/type(uint8)/range] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(dscp)/type(uint8)/range] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(dscp)/type(uint8)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(dscp)/description] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(dscp)/description] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(dscp)/reference] [compile] enter... (undefined) +1ms
  yang:schema [module(ietf-inet-types)/typedef(dscp)/reference] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(dscp)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-flow-label)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-flow-label)/type(uint32)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-flow-label)/type(uint32)] has sub-expressions: range +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-flow-label)/type(uint32)/range] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-flow-label)/type(uint32)/range] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-flow-label)/type(uint32)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-flow-label)] has sub-expressions: type,description,reference +1ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-flow-label)/type(uint32)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-flow-label)/type(uint32)] has sub-expressions: range +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-flow-label)/type(uint32)/range] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-flow-label)/type(uint32)/range] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-flow-label)/type(uint32)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-flow-label)/description] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-flow-label)/description] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-flow-label)/reference] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-flow-label)/reference] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-flow-label)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(port-number)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(port-number)/type(uint16)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(port-number)/type(uint16)] has sub-expressions: range +0ms
  yang:schema [module(ietf-inet-types)/typedef(port-number)/type(uint16)/range] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(port-number)/type(uint16)/range] [compile] done +1ms
  yang:schema [module(ietf-inet-types)/typedef(port-number)/type(uint16)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(port-number)] has sub-expressions: type,description,reference +0ms
  yang:schema [module(ietf-inet-types)/typedef(port-number)/type(uint16)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(port-number)/type(uint16)] has sub-expressions: range +0ms
  yang:schema [module(ietf-inet-types)/typedef(port-number)/type(uint16)/range] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(port-number)/type(uint16)/range] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(port-number)/type(uint16)] [compile] done +1ms
  yang:schema [module(ietf-inet-types)/typedef(port-number)/description] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(port-number)/description] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(port-number)/reference] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(port-number)/reference] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(port-number)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(as-number)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(as-number)/type(uint32)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(as-number)/type(uint32)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(as-number)] has sub-expressions: type,description,reference +0ms
  yang:schema [module(ietf-inet-types)/typedef(as-number)/type(uint32)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(as-number)/type(uint32)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(as-number)/description] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(as-number)/description] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(as-number)/reference] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(as-number)/reference] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(as-number)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-address)] [compile] enter... (undefined) +1ms
  yang:schema [module(ietf-inet-types)/typedef(ip-address)/type(union)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-address)/type(union)] has sub-expressions: type,type +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-address)/type(union)/type(inet:ipv4-address)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-address)/type(union)/type(inet:ipv4-address)] [match] with typedef inet:ipv4-address +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-address)/type(union)/type(inet:ipv4-address)] [match] check if current module's prefix +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-address)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-address)/type(string)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-address)/type(string)] has sub-expressions: pattern +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-address)/type(string)/pattern] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-address)/type(string)/pattern] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-address)/type(string)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-address)] has sub-expressions: type,description +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-address)/type(string)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-address)/type(string)] has sub-expressions: pattern +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-address)/type(string)/pattern] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-address)/type(string)/pattern] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-address)/type(string)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-address)/description] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-address)/description] [compile] done +1ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-address)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-address)/type(union)/type(inet:ipv4-address)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-address)/type(union)/type(inet:ipv6-address)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-address)/type(union)/type(inet:ipv6-address)] [match] with typedef inet:ipv6-address +0ms
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  yang:schema [module(ietf-inet-types)/typedef(ipv4-prefix)] has sub-expressions: type,description +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-prefix)/type(string)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-prefix)/type(string)] has sub-expressions: pattern +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-prefix)/type(string)/pattern] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-prefix)/type(string)/pattern] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-prefix)/type(string)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-prefix)/description] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-prefix)/description] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-prefix)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)/type(inet:ipv4-prefix)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)/type(inet:ipv6-prefix)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)/type(inet:ipv6-prefix)] [match] with typedef inet:ipv6-prefix +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)/type(inet:ipv6-prefix)] [match] check if current module's prefix +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)/type(string)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)/type(string)] has sub-expressions: pattern,pattern +1ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)/type(string)/pattern] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)/type(string)/pattern] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)/type(string)/pattern] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)/type(string)/pattern] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)/type(string)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)] has sub-expressions: type,description,reference +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)/type(string)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)/type(string)] has sub-expressions: pattern,pattern +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)/type(string)/pattern] [compile] enter... (true) +0ms
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  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)/type(string)/pattern] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)/type(string)/pattern] [compile] done +0ms
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  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)/description] [compile] enter... (undefined) +1ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)/description] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)/reference] [compile] enter... (undefined) +0ms
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  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)/type(inet:ipv6-prefix)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)] has sub-expressions: type,description +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)] has sub-expressions: type,type +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)/type(inet:ipv4-prefix)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)/type(inet:ipv4-prefix)] has sub-expressions: pattern +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)/type(inet:ipv4-prefix)/pattern] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)/type(inet:ipv4-prefix)/pattern] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)/type(inet:ipv4-prefix)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)/type(inet:ipv6-prefix)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)/type(inet:ipv6-prefix)] has sub-expressions: pattern,pattern +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)/type(inet:ipv6-prefix)/pattern] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)/type(inet:ipv6-prefix)/pattern] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)/type(inet:ipv6-prefix)/pattern] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)/type(inet:ipv6-prefix)/pattern] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)/type(inet:ipv6-prefix)] [compile] done +1ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/description] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/description] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-prefix)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-prefix)] has sub-expressions: type,description +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-prefix)/type(string)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv4-prefix)/type(string)] has sub-expressions: pattern +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)/type(inet:ipv4-prefix)/pattern] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)/type(inet:ipv4-prefix)/pattern] [compile] done +0ms
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  yang:schema [module(ietf-inet-types)/typedef(ipv4-prefix)/description] [compile] enter... (true) +0ms
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  yang:schema [module(ietf-inet-types)/typedef(ipv4-prefix)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)] has sub-expressions: type,description,reference +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)/type(string)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)/type(string)] has sub-expressions: pattern,pattern +0ms
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  yang:schema [module(ietf-inet-types)/typedef(ip-prefix)/type(union)/type(inet:ipv6-prefix)/pattern] [compile] enter... (true) +0ms
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  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)/type(string)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)/description] [compile] enter... (true) +0ms
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  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)/reference] [compile] enter... (true) +0ms
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  yang:schema [module(ietf-inet-types)/typedef(ipv6-prefix)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(domain-name)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(domain-name)/type(string)] [compile] enter... (undefined) +1ms
  yang:schema [module(ietf-inet-types)/typedef(domain-name)/type(string)] has sub-expressions: pattern,length +0ms
  yang:schema [module(ietf-inet-types)/typedef(domain-name)/type(string)/pattern] [compile] enter... (undefined) +0ms
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  yang:schema [module(ietf-inet-types)/typedef(domain-name)/type(string)/length] [compile] enter... (undefined) +0ms
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  yang:schema [module(ietf-inet-types)/typedef(domain-name)/type(string)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(domain-name)] has sub-expressions: type,description,reference +0ms
  yang:schema [module(ietf-inet-types)/typedef(domain-name)/type(string)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(domain-name)/type(string)] has sub-expressions: pattern,length +0ms
  yang:schema [module(ietf-inet-types)/typedef(domain-name)/type(string)/pattern] [compile] enter... (true) +0ms
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  yang:schema [module(ietf-inet-types)/typedef(domain-name)/type(string)/length] [compile] enter... (true) +0ms
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  yang:schema [module(ietf-inet-types)/typedef(domain-name)/type(string)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(domain-name)/description] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(domain-name)/description] [compile] done +1ms
  yang:schema [module(ietf-inet-types)/typedef(domain-name)/reference] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(domain-name)/reference] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(domain-name)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)] has sub-expressions: type,type +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:ip-address)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:ip-address)] [match] with typedef inet:ip-address +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:ip-address)] [match] check if current module's prefix +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:ip-address)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:domain-name)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:domain-name)] [match] with typedef inet:domain-name +1ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:domain-name)] [match] check if current module's prefix +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:domain-name)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)] has sub-expressions: type,description +0ms
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  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)] has sub-expressions: type,type +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:ip-address)] [compile] enter... (true) +5ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:ip-address)] has sub-expressions: type,type +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:ip-address)/type(inet:ipv4-address)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:ip-address)/type(inet:ipv4-address)] has sub-expressions: pattern +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-address-no-zone)/type(union)/type(inet:ipv4-address-no-zone)/pattern] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-address-no-zone)/type(union)/type(inet:ipv4-address-no-zone)/pattern] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:ip-address)/type(inet:ipv4-address)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:ip-address)/type(inet:ipv6-address)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:ip-address)/type(inet:ipv6-address)] has sub-expressions: pattern,pattern +1ms
  yang:schema [module(ietf-inet-types)/typedef(ip-address-no-zone)/type(union)/type(inet:ipv6-address-no-zone)/pattern] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-address-no-zone)/type(union)/type(inet:ipv6-address-no-zone)/pattern] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-address-no-zone)/type(union)/type(inet:ipv6-address-no-zone)/pattern] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(ip-address-no-zone)/type(union)/type(inet:ipv6-address-no-zone)/pattern] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:ip-address)/type(inet:ipv6-address)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:ip-address)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:domain-name)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:domain-name)] has sub-expressions: pattern,length +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:domain-name)/pattern] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:domain-name)/pattern] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:domain-name)/length] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:domain-name)/length] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)/type(inet:domain-name)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/type(union)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/description] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)/description] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(host)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(uri)] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(uri)/type(string)] [compile] enter... (undefined) +1ms
  yang:schema [module(ietf-inet-types)/typedef(uri)/type(string)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(uri)] has sub-expressions: type,description,reference +0ms
  yang:schema [module(ietf-inet-types)/typedef(uri)/type(string)] [compile] enter... (true) +0ms
  yang:schema [module(ietf-inet-types)/typedef(uri)/type(string)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(uri)/description] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(uri)/description] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(uri)/reference] [compile] enter... (undefined) +0ms
  yang:schema [module(ietf-inet-types)/typedef(uri)/reference] [compile] done +0ms
  yang:schema [module(ietf-inet-types)/typedef(uri)] [compile] done +0ms
  yang:schema [module(ietf-inet-types)] [compile] done +0ms
  yang:element use: using previously loaded 'module:ietf-inet-types' +1m
  yang:node retrying import(/Users/XXXX/gitrepos/yang-js/test/nodetest/ietf-packet-fields.yang) +59ms
  yang:schema [import(ietf-inet-types)] { prefix: '1', 'revision-date': '0..1' } +12ms
  yang:node ExpressionError: [import(ietf-inet-types)] scope violation - invalid 'reference' extension found
  yang:node     at Function.Element.error (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/element.js:60:15)
  yang:node     at Function.Expression.error (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/expression.js:191:40)
  yang:node     at Function.Element.merge (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/element.js:308:22)
  yang:node     at Function.Yang.merge (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/yang.js:352:39)
  yang:node     at /Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/element.js:244:24
  yang:node     at Array.forEach (<anonymous>)
  yang:node     at Function.Element.extends (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/element.js:242:13)
  yang:node     at Function.Yang.parse (/Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/yang.js:76:48)
  yang:node     at /Users/XXXX/gitrepos/yang-js/test/nodetest/node_modules/yang-js/lib/yang.js:78:24
  yang:node     at Array.map (<anonymous>) +12ms

[Vafa-Andalibi]

Just the quick note that the dependencies can be imported separately successfully. i.e. something like the following will not raise an error as it's raising in the above log:

Yang.import("ietf-inet-types");

[sekur]

The issue appears to be related to YANG statement scope validation. Based on RFC-6020 (YANG 1.0), an import statement cannot contain a reference sub-statement. However, RFC-7950 (YANG 1.1) allows import statement to also contain description and reference sub-statements.

yang-js is not fully YANG 1.1 compliant so you can comment out the reference sub-statement in the YANG schema that is importing the dependency modules for now.

I'll add to yang-js parser to allow them in the next release.

[sekur]

I'll also need to fix the infinite loop issue during Yang.import when we encounter syntax error during include/import where dependency is found successfully.

[Vafa-Andalibi]

Thank you that fixed the infinite loop issue. I'm still getting some errors but I don't think it's the yang-js problem anymore. Is there any timeline for Yang v1.1 support?

[Vafa-Andalibi]

Actually I think the new issue can be yang-js related. I'm now getting this error:

Error [ExpressionError]: [module(ietf-packet-fields)/grouping(acl-ipv4-header-fields)/leaf(flags)/type(bits)] unable to resolve typedef for bits

So for some reason the bits basetype cannot be resolved. Any idea about this?

[sekur]

Yes, it's because yang-js currently doesn't support bits typedef... I'd welcome a patch to add that support. :-)

It needs to be added to src/lang/typedefs.coffee.

You can check current status of YANG 1.0 compliance report

[sekur]

Preliminary support for bits added as per #106.