WIP Breaking Change for DataValidation #4240
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Fix PHPOffice#797 (marked stale in 2018, but now reopened). Fix PHPOffice#4091. DataValidation is specified in the Xml at the sheet level rather than the cell level. PhpSpreadsheet, however, currently requires a cell and a data validation object for each cell in a range. As a consequence, it may exhaust memory allocating objects that are never really needed. If it reads a spreadsheet which applies DataValidation to an entire column, the reader creates a million cells and a million DataValidation objects. An additional problem is that, when it saves the spreadsheet, it creates a row entry for each of the million rows even if they contain no data. The code is changed to locate DataValidation for a cell by running the DataValidation list to see if the Sqref for any entry matches the cell in question. This eliminates the need to require a DataValidation entry for each cell; indeed, it eliminates the need to create a cell just because it is subject to DataValidation. Initial tests are very encouraging. The memory-exhausting spreadsheet from 797 required over 1GB of memory. With this change in place, that is reduced to 6MB, and DataValidation works as expected for all cells in the range. This change is a work in progress. It needs formal tests. I need to see how it works with inserting or removing rows and columns. I need to see how Excel handles conflicting entries. My early tests indicate that it at least doesn't do anything irrational (like claiming corruption) when dealing with conflicts. It appears that, if I have a DataValidation applied to column A, and another applied to cell A5, whichever appears first in the Xml is the ultimate arbiter of what rule applies to A5. If this change is merged, it will be a breaking range. It will require a new major release (probably PhpSpreadsheet 4.0), and will not happen for at least a couple of months, and probably later.
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Existing code for ReferenceHelper adjusts sqref for DataValidation when rows/columns inserted/deleted, but does not adjust formula (where list may be expressed as a range). That is a bug, and I think it needs to be fixed as part of this PR. |
Also add first tests that DV formulas are updated correctly after row/column insert/delete. Many more tests are still needed.
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This has been requested a few times, most recently issue PHPOffice#4092. Because it's a breaking change, I haven't proceeded with it. But, because I have a breaking change PR PHPOffice#4240 already in the queue, this gives a plan for getting where we want to go (under the extremely likely assumption that most users don't deal with Csv files with Mac line endings). This PR doesn't change the current behavior, but it gets us to a state where a single-line change will be sufficient when the time comes for a new major release.
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When Html Writer outputs a cell with a boolean value, the result will either be 1 or null-string; neither of these is optimal for anyone looking at the resulting html. Html Reader already has the ability to recognize data types using the html `data-type` attribute, but Html Writer doesn't use it. This PR adds the ability to generate that attribute for booleans. It will generate a string value appropriate for the locale when it encounters a boolean. Html Reader, when it encounters `data-type="b"`, will interpret the result as true if the value is 1 or a string value recognized as true in any locale; it will interpret the result as false if the value is 0, null-string, null, or a string value recognized as false in any locale; if none of the above, it will leave the value as an unchanged string. So, Reader will wind up with the correct result even if its locale is different than what Writer used. Because this is a breaking change, it is opt-in. You need to call `Writer::setBetterBoolean(true)` in order for it take effect. The current default value for that property is false. When it is time to introduce breaking changes (see PR PHPOffice#4240), the default will be changed to true.
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Fix #797 (marked stale in 2018, but now reopened). Fix #4091. DataValidation is specified in the Xml at the sheet level rather than the cell level. PhpSpreadsheet, however, currently requires a cell and a data validation object for each cell in a range. As a consequence, it may exhaust memory allocating objects that are never really needed. If it reads a spreadsheet which applies DataValidation to an entire column, the reader creates a million cells and a million DataValidation objects. An additional problem is that, when it saves the spreadsheet, it creates a row entry for each of the million rows even if they contain no data.
The code is changed to locate DataValidation for a cell by running the DataValidation list to see if the Sqref for any entry matches the cell in question. This eliminates the need to require a DataValidation entry for each cell; indeed, it eliminates the need to create a cell just because it is subject to DataValidation. Initial tests are very encouraging. The memory-exhausting spreadsheet from 797 required over 1GB of memory. With this change in place, that is reduced to 6MB, and DataValidation works as expected for all cells in the range.
This change is a work in progress. It needs formal tests. I need to see how it works with inserting or removing rows and columns. I need to see how Excel handles conflicting entries. My early tests indicate that it at least doesn't do anything irrational (like claiming corruption) when dealing with conflicts. It appears that, if I have a DataValidation applied to column A, and another applied to cell A5, whichever appears first in the Xml is the ultimate arbiter of what rule applies to A5.
If this change is merged, it will be a breaking range. It will require a new major release (probably PhpSpreadsheet 4.0), and will not happen for at least a couple of months, and probably later.
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