#include <symtable.h>
Public Types | |
enum | { SYMBOL_REF = 0x0024 } |
The character preceding a symbol reference name. More... | |
Public Member Functions | |
virtual | ~SymbolTable () |
Destructor. | |
virtual const UnicodeString * | lookup (const UnicodeString &s) const=0 |
Lookup the characters associated with this string and return it. | |
virtual const UnicodeFunctor * | lookupMatcher (UChar32 ch) const=0 |
Lookup the UnicodeMatcher associated with the given character, and return it. | |
virtual UnicodeString | parseReference (const UnicodeString &text, ParsePosition &pos, int32_t limit) const=0 |
Parse a symbol reference name from the given string, starting at the given position. |
A symbol table maintains two kinds of mappings. The first is between symbolic names and their values. For example, if the variable with the name "start" is set to the value "alpha" (perhaps, though not necessarily, through an expression such as "$start=alpha"), then the call lookup("start") will return the char[] array ['a', 'l', 'p', 'h', 'a'].
The second kind of mapping is between character values and UnicodeMatcher objects. This is used by RuleBasedTransliterator, which uses characters in the private use area to represent objects such as UnicodeSets. If U+E015 is mapped to the UnicodeSet [a-z], then lookupMatcher(0xE015) will return the UnicodeSet [a-z].
Finally, a symbol table defines parsing behavior for symbolic names. All symbolic names start with the SYMBOL_REF character. When a parser encounters this character, it calls parseReference() with the position immediately following the SYMBOL_REF. The symbol table parses the name, if there is one, and returns it.
Definition at line 55 of file symtable.h.
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The character preceding a symbol reference name.
Definition at line 63 of file symtable.h. |
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Destructor.
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Lookup the characters associated with this string and return it.
Return
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Lookup the UnicodeMatcher associated with the given character, and return it.
Return
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Parse a symbol reference name from the given string, starting at the given position. If no valid symbol reference name is found, return the empty string and leave pos unchanged. That is, if the character at pos cannot start a name, or if pos is at or after text.length(), then return an empty string. This indicates an isolated SYMBOL_REF character.
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