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| ## Specification of form manipulation | ||
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| Specification of the value-to-form processing in Lexibank datasets: | ||
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| The value-to-form processing is divided into two steps, implemented as methods: | ||
| - `FormSpec.split`: Splits a string into individual form chunks. | ||
| - `FormSpec.clean`: Normalizes a form chunk. | ||
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| These methods use the attributes of a `FormSpec` instance to configure their behaviour. | ||
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| - `brackets`: `{'(': ')'}` | ||
| Pairs of strings that should be recognized as brackets, specified as `dict` mapping opening string to closing string | ||
| - `separators`: `;/,` | ||
| Iterable of single character tokens that should be recognized as word separator | ||
| - `missing_data`: `['*', '---', '-']` | ||
| Iterable of strings that are used to mark missing data | ||
| - `strip_inside_brackets`: `True` | ||
| Flag signaling whether to strip content in brackets (**and** strip leading and trailing whitespace) | ||
| - `replacements`: `[]` | ||
| List of pairs (`source`, `target`) used to replace occurrences of `source` in formswith `target` (before stripping content in brackets) | ||
| - `first_form_only`: `False` | ||
| Flag signaling whether at most one form should be returned from `split` - effectively ignoring any spelling variants, etc. | ||
| - `normalize_whitespace`: `True` | ||
| Flag signaling whether to normalize whitespace - stripping leading and trailing whitespace and collapsing multi-character whitespace to single spaces | ||
| - `normalize_unicode`: `None` | ||
| UNICODE normalization form to use for input of `split` (`None`, 'NFD' or 'NFC') |
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