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Caxlsx is using both `.` and `::`, 220 occurrences vs 280 to invoke
methods on `Axlsx` module.
This commit standardizes the approach towards `.`, which will also allow
shorter lines.
Performance is not affected
```
Comparison:
Axlsx.validate: 8515252.3 i/s
Axlsx::validate: 8512863.7 i/s - same-ish: difference falls within error
```
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`Kernel#format` is faster and will avoid to allocate an array compared
to `String#%`.
```
IPS:
kernel_format: 3877614.2 i/s
string_percent: 3531475.0 i/s - 1.10x (± 0.00) slower
Memory:
kernel_format: 160 allocated
string_percent: 200 allocated - 1.25x more
```
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Prefer interpolation over concatenation
```
Comparison ("String#{'String'}" vs 'String' + 'String'):
interpolation: 11821321.0 i/s
concatenation: 8849491.7 i/s - 1.34x (± 0.00) slower
```
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- Lint/AmbiguousBlockAssociation
- Lint/AmbiguousOperatorPrecedence
- Lint/EmptyBlock
- Lint/RedundantSplatExpansion
- Lint/RedundantStringCoercion
- Lint/SymbolConversion
- Lint/UnusedBlockArgument
- Style/BlockDelimiters
- Style/CommentAnnotation
- Style/EachForSimpleLoop
- Style/EmptyMethod
- Style/ExpandPathArguments
- Style/FileWrite
- Style/GlobalStdStream (UNSAFE)
- Style/HashEachMethods (UNSAFE)
- Style/NestedParenthesizedCalls
- Style/NilComparison
- Style/NumericLiteralPrefix (manually fixed)
- Style/ParallelAssignment
- Style/PreferredHashMethods (UNSAFE)
- Style/RedundantInterpolation (UNSAFE)
- Style/RedundantParentheses (UNSAFE)
- Style/RegexpLiteral
- Style/RescueStandardError
- Style/SpecialGlobalVars (UNSAFE)
- Style/SymbolProc (UNSAFE)
- Style/ZeroLengthPredicate (UNSAFE)
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add test cases
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```
rubocop --only Layout/LeadingCommentSpace -a
```
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Configure with `AllowBeforeTrailingComments: true`
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- Layout/SpaceAfterComma
- Layout/SpaceAroundEqualsInParameterDefault
- Layout/SpaceAroundOperators
- Layout/SpaceBeforeBlockBraces
- Layout/SpaceInsideBlockBraces
- Layout/SpaceInsideHashLiteralBraces
- Layout/SpaceInsideParens
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```
rubocop --only Layout/SpaceInsideReferenceBrackets -a
```
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```
rubocop --only Layout/EmptyLineBetweenDefs -a
```
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```
rubocop --only Layout/EmptyLines -a
```
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```
rubocop --only Layout/InitialIndentation -a
```
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```
rubocop --only Layout/TrailingEmptyLines -a
```
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```
rubocop --only Layout/TrailingWhitespace -a
```
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Until now this setting was not present in the generated XML. According to the ECMA spec the setting defaults to true, so charts always had rounded corners.
Now rounded corners can be disabled explicitly.
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Until now this setting was hardcoded to `true`.
The setting affects whether data from hidden cells (cells width zero height or width) is used when plotting the chart.
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Before this change, a chart with a blank title would show up in Excel with a default title like “Chart title” or “Diagrammtitel”.
It was not possible to completely hide a chart title: Setting it to an empty space would override Excel’s default, but the empty title did still occupy vertical space.
Per OOXML standard the `title` element is optional, so omitting it if the title is blank looks like the right thing to do and seems to work correctly in Excel.
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Before this change, creating a chart title referencing an empty cell would lose the cell reference. If the cell was later set to a non-blank value (either during generating the file, or while editing it in a spreadsheet app), the chart title would stay blank.
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`gap_width` and `gap_depth` now allow only integers in the range of 0–500. The previous behaviour (requiring a percentage value) was according to the current version of the OOXML spec, but Excel seems to rely on an older version, where the gap amount was required to be a simple integer.
Also, `gapDepth` is only allowed in 3D bar charts, so it is now no longer available for 2D bar charts.
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Split examples into separate markdown files, each containing a description, sample code, and a screenshot of the resulting xlsx document.
The script `generate.rb` is provided to actually generate the example documents by executing the sample code contained in the markdown files.
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Fixes #37
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