编译原理实验
输入。
词法分析结果文件 la_output
。
注释格式:
# 我是一条注释 我不是注释
词法错误:
^ 错误内容 错误输出
输入样例:见词法分析器的输出样例
。
输出。
字符流输出。
输出样例:
[Lexical ERROR] [2,12] Invalid ID: "3er"
[Lexical ERROR] [2,15] Missing "=" near the ":" ;
[Grammar ERROR] [1,5] Missing word "program"
[Grammar ERROR] [1,6] Missing identifier after "program"
[Grammar ERROR] [2,10] Missing end character ";"
[Grammar ERROR] [2,14] Cannot resolve type "3er"
[Grammar ERROR] [3,7] Cannot resolve type "va"
[Grammar ERROR] [7,22] Missing word "do"
错误提示。
关键字错误。
关键字 | 丢失 | 拼写错误 |
---|---|---|
program | supported |
|
const | supported |
|
var | supported |
|
procedure | supported |
|
begin | supported |
|
if | ||
then | supported |
|
while | ||
do | supported |
|
call | ||
read | ||
write | ||
end | supported |
标识符错误。
区域 | 丢失 | 拼写错误 |
---|---|---|
program | supported |
supported |
const | supported |
supported |
var | supported |
supported |
procedure | supported |
supported |
read | supported |
supported |
类型错误。
类型 | 拼写错误 |
---|---|
const | supported |
var | supported |
符号错误。
区域 | 符号 | 丢失 |
---|---|---|
program | ; | supported |
const | := | supported |
, | supported |
|
; | supported |
|
var | , | supported |
; | supported |
|
procedure | ( | supported |
) | supported |
|
; | supported |
|
read | ( | supported |
) | supported |
|
write | ( | supported |
) | supported |
未知错误。
输入。
使用 PL/0
编写的源程序。
输入样例:
progam hhh;
const er:3, te:=a, tt:=3;
vr hhh;
begin
aaa:=26;
end
输出。
词法分析结果文件 la_output
。
输出样例:
# Lexical Analysis Result
# Generate Time: Fri Sep 29 18:40:39 2017
# Program File Name: input
# Language Set: PL/0
progam ID 1 7
hhh ID 1 11
; EOP 1 12
const RESERVED 2 10
er ID 2 13
^ := AOP 2 14
[Lexical ERROR] [2,14] Missing "=" near the ":" ;
3 INT 2 15
, SOP 2 16
te ID 2 19
:= AOP 2 21
a ID 2 22
, SOP 2 23
tt ID 2 26
:= AOP 2 28
3 INT 2 29
; EOP 2 30
vr ID 3 7
hhh ID 3 11
; EOP 3 12
begin RESERVED 4 6
aaa ID 5 8
:= AOP 5 10
26 INT 5 12
; EOP 5 13
end RESERVED 6 4
关键字。
program
, const
, var
, procedure
, begin
, if
, then
, while
, call
, read
, write
, end
, do
.
比较符。
=
, <>
, <
, <=
, >
, >=
赋值符。
:=
操作符。
*
, /
, +
, -
结束符。
;
分隔符。
(
, )
, ,
错误提示。
- 变量名错误:
[Lexical ERROR] [1,25] Invalid ID: "12a"
- 赋值符号错误:
[Lexical ERROR] [1,27] Missing "=" near the ":"
<prog> → program <id>; <block>
<block> → [<condecl>][<vardecl>][<proc>]<body>
<condecl> → const <const>{,<const>}; // 可以是一个集合
<const> → <id>:=<integer>
<vardecl> → var <id>{,<id>};
<proc> → procedure <id>(<id>{,<id>});<block>{;<proc>}
<body> → begin <statement>{;<statement>}end
<statement> → <id> := <exp>
|if <lexp> then <statement>[else <statement>]
|while <lexp> do <statement>
|call <id>[(<exp>{,<exp>})]
|<body>
|read (<id>{,<id>})
|write (<exp>{,<exp>})
<lexp> → <exp> <lop> <exp>|odd <exp>
<exp> → [+|-]<term>{<aop><term>}
<term> → <factor>{<mop><factor>}
<factor>→<id>|<integer>|(<exp>)
<lop> → =|<>|<|<=|>|>=
<aop> → +|-
<mop> → *|/
<id> → l{l|d} (注:l表示字母)
<integer> → d{d}
版权信息。
Copyright © 2017 TripleZ