lexical analyser definition
<language> (Or "scanner") The initial input stage of a
language processor (e.g. a compiler), the part that performs
lexical analysis.
(1995-04-05)
Nearby terms:
Lex « lexeme « lexer « lexical analyser » lexical analysis » lexical scope » lexical scoping
lexical analysis definition
<programming> (Or "linear analysis", "scanning") The first
stage of processing a language. The stream of characters
making up the source program or other input is read one at a
time and grouped into lexemes (or "tokens") - word-like
pieces such as keywords, identifiers, literals and
punctutation. The lexemes are then passed to the parser.
["Compilers - Principles, Techniques and Tools", by Alfred
V. Aho, Ravi Sethi and Jeffrey D. Ullman, pp. 4-5]
(1995-04-05)
Nearby terms:
lexeme « lexer « lexical analyser « lexical analysis » lexical scope » lexical scoping » lexiphage
lexical scope definition
<programming> (Or "static scope") When the scope of an
identifier is fixed at compile time to some region in the
source code containing the identifier's declaration. This
means that an identifier is only accessible within that region
(including procedures declared within it).
This contrasts with dynamic scope where the scope depends on
the nesting of procedure and function calls at run time.
Statically scoped languages differ as to whether the scope is
limited to the smallest block (including begin/end blocks)
containing the identifier's declaration (e.g. C, Perl) or
to whole function and procedure bodies (e.g. ECMAScript), or
some larger unit of code (e.g. ?). The former is known as
static nested scope.
(2005-07-28)
Nearby terms:
lexer « lexical analyser « lexical analysis « lexical scope » lexical scoping » lexiphage » LF
lexical scoping definition
lexical scope
Nearby terms:
lexical analyser « lexical analysis « lexical scope « lexical scoping » lexiphage » LF » LG
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