问题描述
我已经创建了以下语法图和它的 EBNF 元语言结构。
我的 ENBF 结构，
var_part = var [identifier { "," identifier } ":" type "κ" { }].
identifier = letter { letter | digit }.
type = "integerKG" | "realKG" | "charKG" | "booleanKG".
letter = "A" | "B" | "C" | "D" | "E" | "F" | "G" | "H" | "I" | "J" | "K" | "L" | "M" | "N" | "O" | "P" | "Q" | "R" | "S" | "T" | "U" | "V" | "W" | "X" | "Y" | "Z" | "a" | "b" | "c" | "d" | "e" | "f" | "g" | "h" | "i" | "j" | "k" | "l" | "m" | "n" | "o" | "p" | "q" | "r" | "s" | "t" | "u" | "v" | "w" | "x" | "y" | "z".
digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9".
我想创建它的 LEX 程序。到目前为止，我创建了以下内容：
%{
#include <stdio.h>
#include <string.h>
%}
type integerAK|charaK|booleanAK|realAK
var [a-zA-Z_][a-zA-Z_0-9]
comma {var}(","{var}):" "{type}"Θ"
order var" "{comma}(" "{comma})
%%
{order} printf("Correct Syntax");
.* printf("Invalid Syntax");
%%
我收到 EOF 错误，但找不到我做错了什么。有什么想法吗？
解决方法
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