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2.2 文本值语法</div>
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<div class="Element13"><div class="Element12" id="code00001"><pre class="Element12">time_literal ::= <span style="color: #008000">// 引用自附录A.8.4</span>
unsigned_number time_unit
| fixed_point_number time_unit
time_unit ::= <strong><span style="color: #FF0000">s</span></strong> | <strong><span style="color: #FF0000">ms</span></strong> | <strong><span style="color: #FF0000">us</span></strong> | <strong><span style="color: #FF0000">ns</span></strong> | <strong><span style="color: #FF0000">ps</span></strong> | <strong><span style="color: #FF0000">fs</span></strong> | <strong><span style="color: #FF0000">step</span></strong>
number ::= <span style="color: #008000">// 引用自附录A.8.7</span>
integral_number
| real_number
integral_number ::=
decimal_number
| octal_number
| binary_number
| hex_number
decimal_number ::=
unsigned_number
| [size]decimal_base unsigned_number
| [size]decimal_base x_digit{<strong><span style="color: #FF0000">_</span></strong>}
| [size]decimal_base z_digit{<strong><span style="color: #FF0000">_</span></strong>}
binary_number ::= [size]binary_base binary_value
octal_number ::= [size]octal_base octal_value
hex_number ::= [size]hex_base hex_value
sign ::= <strong><span style="color: #FF0000">+</span></strong> | <strong><span style="color: #FF0000">-</span></strong>
size ::= non_zero_unsigned_number
non_zero_unsigned_number ::= non_zero_decimal_digit{<strong><span style="color: #FF0000">_</span></strong>|decimal_digit}
real_number ::=
fixed_point_number
| unsigned_number[<strong><span style="color: #FF0000">.</span></strong>unsigned_number]exp[sign]unsigned_number
fixed_point_number ::= unsigned_number<strong><span style="color: #FF0000">.</span></strong>unsigned_number
exp ::= <strong><span style="color: #FF0000">e</span></strong> | <strong><span style="color: #FF0000">E</span></strong>
unsigned_number ::= decimal_digit{<strong><span style="color: #FF0000">_</span></strong>|decimal_digit}
string_literal ::= <strong><span style="color: #FF0000">"</span></strong>{Any_ASCII_Characters}<strong><span style="color: #FF0000">" </span><span style="color: #008000"></strong>// 引用自附录A.8.8</span></pre></div></div>
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