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Item7278: %IF% interprets "0" as "undef" instead of a number and can't recognize single character variable name

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AppliesTo: Component: Priority: CurrentState: WaitingFor: TargetRelease ReleasedIn
Engine   Normal Closed   major 6.0.0

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Summary:
Reported By:
Codebase:
Applies To:
Component:
Priority:
Current State:
Waiting For:
Target Release:
Released In:
 

Detail

'0 < $ t and $ t < 1000' causes a syntax error

The following IF{...}% causes an error: Syntax error in '0 < $ t and $ t < 1000' at ' < $ t and $ t < 1000' 
%IF{"0 < $ t and $ t < 1000" then="true" else="false"}%
Result: false 

%IF{"(0 < $ t) and ($ t < 1000)" then="true" else="false"}%
Result: false

'-1 > 0' is true

The following IF{...} is expanded to true though false is expected. 
%IF{"-1 > 0" then="true" else="false"}%
Result: false

-- TWiki:Main/HideyoImazu - 2013-06-06

Tests:

  • "0 < $ t and $ t < 1000": false
  • "0 < $ t": false
  • "0 < $ tt": false
  • "0 < $ ttt": false
  • "0 < 1 and 1 < 1000": true
  • "(0 < $ t) AND ($ t < 1000)": false
  • "(0 < 1) AND (1 < 1000)": true

More tests:

  • "0 > -1": true
  • "0 < -1": false
  • "0 > 1": false
  • "0 < 1": true
  • "-1 < 0": true
  • "-1 > 0": false
  • "1 < 0": false
  • "1 > 0": true

-- Peter Thoeny - 2013-06-20

Issue with first bug: The parser does not grok single letter variable names.

-- TWiki:Main.PeterThoeny - 2013-06-20

  1. IF statement interprets "0" as "undef" instead of a numberic character. In result, all the comparison against "0" is actually comparing with "undef".
  2. One letter variable name triggers unexpected syntax error is a defect from regex.

-- TWiki:Main.YaojunFei - 2013-09-06

ItemTemplate
Summary %IF% interprets "0" as "undef" instead of a number and can't recognize single character variable name
ReportedBy TWiki:Main.HideyoImazu
Codebase

SVN Range TWiki-5.1.3-trunk, Tue, 04 Jun 2013, build 25988
AppliesTo Engine
Component

Priority Normal
CurrentState Closed
WaitingFor

Checkins TWikirev:26281 TWikirev:26282
TargetRelease major
ReleasedIn 6.0.0
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Topic revision: r10 - 2013-10-15 - PeterThoeny
 
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