d226a35c0a
Reasons: - Performance: HsYAML is around 20 times slower in parsing large YAML bibliographies (#6084). - An issue was submitted to HsYAML, but it hasn't gotten any attention. HsYAML seems borderline unmaintained; it hasn't had a commit in over a year. - Unfortunately this goes back on our attempts to free ourselves from C dependencies (#4535). But I don't see a better alternative until a better pure Haskell parser is available. Closes #6084. Notes: - We've removed the FromYAML instances for all types that had them, since this is a HsYAML-specific typeclass [API change]. (The yaml package just uses From/ToJSON.) - Unlike HsYAML (in the configuration we were using), yaml parses 'Y', 'N', 'Yes', 'No', 'On', 'Off' as boolean values. Users may need to quote these when they are meant to be interpreted as strings. Similarly, 'null' is parsed as a YAML null value (and will be treated as an empty string by pandoc rather than the string 'null'). Quoting it will force it to be interpreted as a string. - Some tests had to be adjusted accordingly. - Pandoc now behaves better when the YAML metadata contains escaping errors: instead of just falling back on treating the section as a table, it raises a YAML parsing error.
121 lines
2.5 KiB
Markdown
121 lines
2.5 KiB
Markdown
```
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% pandoc -s -t native
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---
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foobar_: this should be ignored
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foo:
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bar_: as should this
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---
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^D
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Pandoc
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Meta
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{ unMeta = fromList [ ( "foo" , MetaMap (fromList []) ) ] }
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[]
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```
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```
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% pandoc -s -t native
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---
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# For precedence, see multiple-metadata-blocks.md and vars-and-metadata.md
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# For Bools, see also 4819.md
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# For Multiline strings, see yaml-with-chomp.md
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int: 7
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float: 1.5
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scientific: 3.7e-5
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bool: true
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more: False
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nothing: null
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empty: []
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nested:
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int: 8
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float: 2.5
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bool: true
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more: False
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nothing: null
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empty: []
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scientific: 3.7e-5
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---
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^D
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Pandoc
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Meta
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{ unMeta =
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fromList
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[ ( "bool" , MetaBool True )
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, ( "empty" , MetaList [] )
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, ( "float" , MetaInlines [ Str "1.5" ] )
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, ( "int" , MetaInlines [ Str "7" ] )
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, ( "more" , MetaBool False )
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, ( "nested"
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, MetaMap
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(fromList
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[ ( "bool" , MetaBool True )
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, ( "empty" , MetaList [] )
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, ( "float" , MetaInlines [ Str "2.5" ] )
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, ( "int" , MetaInlines [ Str "8" ] )
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, ( "more" , MetaBool False )
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, ( "nothing" , MetaString "" )
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, ( "scientific" , MetaInlines [ Str "3.7e-5" ] )
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])
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)
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, ( "nothing" , MetaString "" )
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, ( "scientific" , MetaInlines [ Str "3.7e-5" ] )
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]
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}
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[]
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```
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```
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% pandoc -s -t native
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---
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array:
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- foo: bar
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- bool: True
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---
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^D
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Pandoc
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Meta
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{ unMeta =
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fromList
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[ ( "array"
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, MetaList
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[ MetaMap
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(fromList [ ( "foo" , MetaInlines [ Str "bar" ] ) ])
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, MetaMap (fromList [ ( "bool" , MetaBool True ) ])
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]
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)
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]
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}
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[]
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```
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```
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% pandoc -s -t native --metadata-file command/yaml-metadata.yaml
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---
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title: document
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---
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^D
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Pandoc
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Meta
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{ unMeta =
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fromList
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[ ( "other"
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, MetaInlines
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[ Emph [ Str "markdown" ] , Space , Str "value" ]
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)
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, ( "title" , MetaInlines [ Str "document" ] )
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]
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}
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[]
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```
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```
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% pandoc -s -t native --metadata-file command/yaml-metadata.yaml -M title=cmdline
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^D
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Pandoc
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Meta
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{ unMeta =
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fromList
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[ ( "other"
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, MetaInlines
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[ Emph [ Str "markdown" ] , Space , Str "value" ]
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)
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, ( "title" , MetaString "cmdline" )
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]
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}
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[]
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```
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