Bug 186749

Summary: YARR: Implement support for Annex B section CharacterRangeOrUnion
Product: WebKit Reporter: Michael Saboff <msaboff>
Component: JavaScriptCoreAssignee: Michael Saboff <msaboff>
Status: ASSIGNED ---    
Severity: Normal    
Priority: P2    
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   

Description Michael Saboff 2018-06-17 08:45:58 PDT 
YARR currently ignores the ECMAScript Annex B section CharacterRangeOrUnion ( A, B ) (https://tc39.github.io/ecma262/#sec-runtime-semantics-characterrangeorunion-abstract-operation) for the case where Unicode is true.  We always create a Union when A and/or B is a Character Set.

The abstract operation CharacterRangeOrUnion takes two CharSet parameters A and B and performs the following steps:

If Unicode is false, then
    If A does not contain exactly one character or B does not contain exactly one character, then
    Let C be the CharSet containing the single character - U+002D (HYPHEN-MINUS).
    Return the union of CharSets A, B and C.

Return CharacterRange(A, B).