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class Symbols extends AnyRef

To encode non-ASCII characters ("symbols") in strings, Isabelle uses a proprietary encoding which encodes a symbol as a substring \<name> where name is the name of the substring. (Thus, strings containing symbols are ASCII strings.) There is a loose correspondence between symbols and Unicode codepositions that is documented in a machine readable format in etc/symbols in the Isabelle distribution. This class translates between Isabelle's encoding and Unicode strings.

If the default values for this class's constructor are appropriate, consider using the static functions Symbols.symbolsToUnicode and Symbols.unicodeToSymbols instead of instantiating this class.

Source
Symbols.scala
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Instance Constructors

  1. new Symbols(symbolsFile: URL = ..., extraSymbols: Iterable[(String, Int)] = Nil, extraSymbolsLowPri: Iterable[(String, Int)] = Nil, processSubSuper: ProcessSubSuperMode = ProcessSubSuperMode.Yes)

    symbolsFile

    Location of the symbols that specifies the correspondence. Default: symbols file from Isabelle2020 (bundled with this library).

    extraSymbols

    Additional symbol name / codepoint pairs to use in addition to those in the symbols file. When converting from Unicode to symbols, these mappings have higher priority than the ones from symbolsFile.

    extraSymbolsLowPri

    Additional symbol name / codepoint pairs to use in addition to those in the symbols file. When converting from Unicode to symbols, these mappings have lower priority than the ones from symbolsFile.

    processSubSuper

    Whether to process ⇩ and ⇧ symbols (on the Isabelle side) into/from subscript/superscript symbols in Unicode. (for those letters that have Unicode subscript/superscript symbols)

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  14. def symbolsToUnicode(str: String, failUnknown: Boolean = false): String

    Converts a string in Isabelle's encoding to Unicode.

    Converts a string in Isabelle's encoding to Unicode.

    failUnknown

    If true, unknown symbols cause a CharConversionException. If false, unknown symbols are left unchanged in the string.

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  16. def toString(): String
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  17. def unicodeToSymbols(str: String, failUnknown: Boolean = false): String

    Converts a Unicode string to a string using Isabelle's symbol encoding.

    Converts a Unicode string to a string using Isabelle's symbol encoding.

    failUnknown

    If true, unknown Unicode characters cause a CharConversionException. If false, unknown Unicode characters are encoded as \<unicodeX> where X is the code position in uppercase hex. (Without leading zeros.)

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