April 2002 Draft
JavaScript 2.0
Formal Description
Unit Grammar
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Tuesday, October 9, 2001

This LALR(1) grammar describes the syntax of quoted unit patterns. The input to this grammar is the unit string literal’s contents after the string literal has been processed. See also the description of the grammar notation.

This document is also available as a Word 98 rtf file.

The start nonterminal is UnitPattern.

White Space

σ ∈ {wsoptwsreq}
WhiteSpaceCharacter 
   «TAB» | «VT» | «FF» | «SP» | «u00A0»
|  «u2000» | «u2001» | «u2002» | «u2003» | «u2004» | «u2005» | «u2006» | «u2007»
|  «u2008» | «u2009» | «u200A» | «u200B»
|  «u3000»
LineTerminator ⇒ «LF» | «CR» | «u2028» | «u2029»
RequiredWhiteSpace 
   WhiteSpaceCharacter
|  LineTerminator
|  RequiredWhiteSpace WhiteSpaceCharacter
|  RequiredWhiteSpace LineTerminator
WhiteSpacewsopt 
   RequiredWhiteSpace
|  «empty»
WhiteSpacewsreq ⇒ RequiredWhiteSpace

Unit Patterns

UnitPattern ⇒ WhiteSpacewsopt UnitQuotient
UnitQuotient 
   UnitProductwsopt
|  UnitProductwsopt / WhiteSpacewsopt UnitProductwsopt
UnitProductσ 
   UnitFactorσ
|  UnitProductwsopt * WhiteSpacewsopt UnitFactorσ
|  UnitProductwsreq UnitFactorσ
UnitFactorσ 
   1 WhiteSpaceσ
|  1 WhiteSpacewsopt ^ WhiteSpacewsopt SignedInteger WhiteSpaceσ
|  Identifier WhiteSpaceσ
|  Identifier WhiteSpacewsopt ^ WhiteSpacewsopt SignedInteger WhiteSpaceσ

Signed Integers

SignedInteger 
   DecimalDigits
|  + DecimalDigits
|  - DecimalDigits
DecimalDigits 
   ASCIIDigit
|  DecimalDigits ASCIIDigit
ASCIIDigit ⇒ 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9

Identifiers

Identifier 
   InitialIdentifierCharacter
|  Identifier ContinuingIdentifierCharacter
InitialIdentifierCharacter ⇒ UnicodeInitialAlphabetic | $ | _
ContinuingIdentifierCharacter ⇒ UnicodeAlphanumeric | $ | _
UnicodeInitialAlphabetic ⇒ Any Unicode initial alphabetic character (includes ASCII A-Z and a-z)
UnicodeAlphanumeric ⇒ Any Unicode alphabetic or decimal digit character (includes ASCII 0-9, A-Z, and a-z)

Waldemar Horwat
Last modified Tuesday, October 9, 2001
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