STRINGINTTAB(2)STRINGINTTAB(2)NAMEstringinttab - string table lookup module
SYNOPSIS
include "strinttab.m";
StringInt: import StringIntTab;
strinttab := load StringIntTab StringIntTab->PATH;
StringInt: adt{
key: string;
val: int;
};
lookup: fn(tab: array of StringInt, key: string) : (int, int);
revlookup: fn(tab: array of StringInt, val: int) : string;
DESCRIPTION
Stringinttab provides functions that perform forward and reverse
searches of an ordered table of key-value pairs.
A table should be constructed as an array of StringInt entries, ordered
by increasing key value. Keys ordering is determined by comparison of
the Unicode value of their characters.
Lookup performs a binary search of tab for the StringInt entry whose
key field has a value equal to key and returns a tuple: an int whose
value is non-zero if a match has been found and zero otherwise, and an
int whose value is equal to the val field of the matching StringInt
entry.
Revlookup searches tab for the first StringInt entry whose val field
has a value equal to val and returns the corresponding key string.
EXAMPLES
T := load StringIntTab StringIntTab->PATH;
fmtstringtab := array[] of { Strinttab->StringInt
("html", FHtml),
("latex", FLatex),
("latexbook", FLatexBook),
("latexpart", FLatexPart),
("latexproc", FLatexProc),
("latexslides", FLatexSlides),
};
(fnd, fmt) := T->lookup(fmtstringtab, "latexbook");
fmtstring := T->revlookup(fmtstringtab, FLatex);
SOURCE
/appl/lib/strinttab.b
SEE ALSOhash(2)BUGS
Revlookup performs a sequential search of the table.
STRINGINTTAB(2)
