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| ID | Category | Severity | Type | Date Submitted | Last Update | ||
| 0000839 | [1003.1(2013)/Issue7+TC1] Shell and Utilities | Objection | Error | 2014-05-08 18:51 | 2019-06-10 08:54 | ||
| Reporter | rhansen | View Status | public | ||||
| Assigned To | |||||||
| Priority | normal | Resolution | Accepted As Marked | ||||
| Status | Closed | ||||||
| Name | Richard Hansen | ||||||
| Organization | BBN | ||||||
| User Reference | |||||||
| Section | 2.10.2 (Shell Grammar Rules) rule 7.b. | ||||||
| Page Number | 2349 | ||||||
| Line Number | 74755-74761 | ||||||
| Interp Status | Approved | ||||||
| Final Accepted Text | See Note: 0002248 | ||||||
| Summary | 0000839: problems with reduction of WORD to ASSIGNMENT_WORD | ||||||
| Description |
XCU 2.10.2 rule 7.b. has the following issues: * Rule 7.b. should not return WORD -- it should instead defer to rule 1 to allow implementations to add reserved words that contain equals signs. * The rule is missing the "else" case (it should say to apply rule 1 if there is no <equals-sign> character). * Neither quoted <equals-sign> characters nor <equals-sign> characters in embedded parameter expansion, command substitution, or arithmetic expansion constructs should be considered when determining whether to apply rule 1 or return ASSIGNMENT_WORD. Note that the last bullet point above is the subject of 0000643. The resolution of 0000643 does not completely solve the described problem, repeated here: Each of the following: ${foo=bar} $(foo=bar; baz) $((foo=bar)) ~foo=bar/baz "foo=bar" foo\=bar is one token according to XCU 2.3. According to XCU 2.10.2, the tokens match cmd_name, so rule 7a is applied. Each token contains an equals sign, so rule 7a says to apply rule 7b. The tokens do not begin with '=', nor do all characters preceding '=' form a valid name, so according to 7b it is unspecified whether ASSIGNMENT_WORD or WORD is returned. All of these cases should return WORD. |
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| Desired Action |
After applying the changes in 0000643, change XCU 2.10.2 (Shell Grammar Rules) rule 7.b. page 2349 lines 74755-74761 from: If the TOKEN contains the <equals-sign> character: * If it begins with '=', the token WORD shall be returned. * If all the characters in the TOKEN preceding the first '=' form a valid name (see XBD Section 3.231), the token ASSIGNMENT_WORD shall be returned. (Quoted characters cannot participate in forming a valid name.) * Otherwise, it is unspecified whether it is ASSIGNMENT_WORD or WORD that is returned. to: If the TOKEN contains an unquoted (as determined while applying rule #4 from section 2.3) <equals-sign> character that is not part of an embedded parameter expansion, command substitution, or arithmetic expansion construct (as determined while applying rule #5 from section 2.3): * If the TOKEN begins with '=', then rule 1 shall be applied. * If all the characters in the TOKEN preceding the first such <equals-sign> form a valid name (see XBD Section 3.231), the token ASSIGNMENT_WORD shall be returned. (Quoted characters cannot participate in forming a valid name.) * Otherwise, it is unspecified whether rule 1 is applied or ASSIGNMENT_WORD is returned. Otherwise, rule 1 shall be applied. |
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| Tags | tc2-2008 | ||||||
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Notes |
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(0002248) rhansen (manager) 2014-05-22 15:42 edited on: 2014-05-22 15:51 |
Interpretation response ------------------------ The standard is unclear on this issue, and no conformance distinction can be made between alternative implementations based on this. This is being referred to the sponsor. Rationale: ------------- None. Notes to the Editor (not part of this interpretation): ------------------------------------------------------- After applying the changes in 0000643, change XCU 2.10.2 (Shell Grammar Rules) rule 7.b. page 2349 lines 74755-74761 from: If the TOKEN contains the <equals-sign> character: * If it begins with '=', the token WORD shall be returned. * If all the characters in the TOKEN preceding the first '=' form a valid name (see XBD Section 3.231), the token ASSIGNMENT_WORD shall be returned. (Quoted characters cannot participate in forming a valid name.) * Otherwise, it is unspecified whether it is ASSIGNMENT_WORD or WORD that is returned. to: If the TOKEN contains an unquoted (as determined while applying rule #4 from section 2.3) <equals-sign> character that is not part of an embedded parameter expansion, command substitution, or arithmetic expansion construct (as determined while applying rule #5 from section 2.3): * If the TOKEN begins with '=', then rule 1 shall be applied. * If all the characters in the TOKEN preceding the first such <equals-sign> form a valid name (see XBD Section 3.231), the token ASSIGNMENT_WORD shall be returned. * Otherwise, it is unspecified whether rule 1 is applied or ASSIGNMENT_WORD is returned. Otherwise, rule 1 shall be applied. |
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(0002251) ajosey (manager) 2014-05-23 13:18 |
Interpretation Proposed 23 May 2014 |
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(0002276) ajosey (manager) 2014-06-25 10:12 |
Interpretation approved 25 June 2014 |
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Issue History |
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| Date Modified | Username | Field | Change |
| 2014-05-08 18:51 | rhansen | New Issue | |
| 2014-05-08 18:51 | rhansen | Name | => Richard Hansen |
| 2014-05-08 18:51 | rhansen | Organization | => BBN |
| 2014-05-08 18:51 | rhansen | Section | => 2.10.2 (Shell Grammar Rules) rule 7.b. |
| 2014-05-08 18:51 | rhansen | Page Number | => 2349 |
| 2014-05-08 18:51 | rhansen | Line Number | => 74755-74761 |
| 2014-05-22 15:25 | nick | Relationship added | related to 0000643 |
| 2014-05-22 15:42 | rhansen | Note Added: 0002248 | |
| 2014-05-22 15:51 | rhansen | Note Edited: 0002248 | |
| 2014-05-22 15:55 | Don Cragun | Interp Status | => Pending |
| 2014-05-22 15:55 | Don Cragun | Final Accepted Text | => See Note: 0002248 |
| 2014-05-22 15:55 | Don Cragun | Status | New => Interpretation Required |
| 2014-05-22 15:55 | Don Cragun | Resolution | Open => Accepted As Marked |
| 2014-05-22 15:56 | Don Cragun | Tag Attached: tc2-2008 | |
| 2014-05-23 13:18 | ajosey | Interp Status | Pending => Proposed |
| 2014-05-23 13:18 | ajosey | Note Added: 0002251 | |
| 2014-06-25 10:12 | ajosey | Interp Status | Proposed => Approved |
| 2014-06-25 10:12 | ajosey | Note Added: 0002276 | |
| 2019-06-10 08:54 | agadmin | Status | Interpretation Required => Closed |
| 2019-07-30 14:26 | eblake | Relationship added | parent of 0001276 |
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