May 2024
Intermediate to advanced
536 pages
17h 10m
English
Content preview from Compilers: Principles and Practice by Pearson
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Lexical Analyzer 53
The token type is usually denoted by an integer, one specific value for each syntactic type.
Following the convention used by yacc (see Section 3.3), the token type is assigned values greater
than 256. This will allow the one character operators, which are most frequent, to be denoted by the
token type itself. For example, consider statements
label1 : a = a + 5 ; goto label2;
and following illustrative assignments for syntactic types:
Syntactic type Type Operator Value
IDENT 257 : 0x3A
CONS 258 ; 0x3B
GOTO 259
=
0x3D
+
0x28
The Scanner will send out the following tokens to the parser.
Token type
257 0x3A 257 0x3D 257 0x28 258 0x3B
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