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本帖最后由 prolj 于 2010-10-14 11:19 编辑
哦,其实我一直好奇,语法规则是如何设计的,比如现有的c语法,为什么就是这样:
(6.5.1) primary-expression:
identifier
constant
string-literal
( expression )
(6.5.2) postfix-expression:
primary-expression
postfix-expression [ expression ]
postfix-expression ( argument-expression-listopt )
postfix-expression . identifier
postfix-expression -> identifier
postfix-expression ++
postfix-expression --
( type-name ) { initializer-list }
( type-name ) { initializer-list , }
(6.5.2) argument-expression-list:
assignment-expression
argument-expression-list , assignment-expression
(6.5.3) unary-expression:
postfix-expression
++ unary-expression
-- unary-expression
unary-operator cast-expression
sizeof unary-expression
sizeof ( type-name )
(6.5.3) unary-operator: one of
& * + - ~ !
(6.5.4) cast-expression:
unary-expression
( type-name ) cast-expression
(6.5.5) multiplicative-expression:
cast-expression
multiplicative-expression * cast-expression
multiplicative-expression / cast-expression
multiplicative-expression % cast-expression
(6.5.6) additive-expression:
multiplicative-expression
additive-expression + multiplicative-expression
additive-expression - multiplicative-expression
(6.5.7) shift-expression:
additive-expression
shift-expression << additive-expression
shift-expression >> additive-expression
(6.5.8) relational-expression:
shift-expression
relational-expression shift-expression
<
relational-expression shift-expression
>
relational-expression shift-expression
<=
relational-expression shift-expression
>=
(6.5.9) equality-expression:
relational-expression
equality-expression == relational-expression
equality-expression != relational-expression
(6.5.10) AND-expression:
equality-expression
AND-expression & equality-expression
(6.5.11) exclusive-OR-expression:
AND-expression
exclusive-OR-expression ^ AND-expression
(6.5.12) inclusive-OR-expression:
exclusive-OR-expression
inclusive-OR-expression | exclusive-OR-expression
(6.5.13) logical-AND-expression:
inclusive-OR-expression
logical-AND-expression && inclusive-OR-expression
(6.5.14) logical-OR-expression:
logical-AND-expression
logical-OR-expression || logical-AND-expression
(6.5.15) conditional-expression:
logical-OR-expression
logical-OR-expression ? expression : conditional-expression
(6.5.16) assignment-expression:
conditional-expression
unary-expression assignment-operator assignment-expression
(6.5.16) assignment-operator: one of
= *= /= %= += -= <<= >>= &= ^= |=
(6.5.17) expression:
assignment-expression
expression , assignment-expression
(6.6) constant-expression:
conditional-expression |
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