JavaScript 2.0 Unit Grammar

April 2002 Draft

JavaScript 2.0

Formal Description

Unit Grammar

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

{wsopt, wsreq}

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

WhiteSpace^wsopt

RequiredWhiteSpace

| «empty»

WhiteSpace^wsreq RequiredWhiteSpace

Unit Patterns

UnitPattern WhiteSpace^wsopt UnitQuotient

UnitQuotient

UnitProduct^wsopt

| UnitProduct^wsopt / WhiteSpace^wsopt UnitProduct^wsopt

UnitProduct

UnitFactor

| UnitProduct^wsopt * WhiteSpace^wsopt UnitFactor

| UnitProduct^wsreq UnitFactor

UnitFactor

1 WhiteSpace

| 1 WhiteSpace^wsopt ^ WhiteSpace^wsopt SignedInteger WhiteSpace

| Identifier WhiteSpace

| Identifier WhiteSpace^wsopt ^ WhiteSpace^wsopt SignedInteger WhiteSpace

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