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[Normative] Add RegExp Unicode property escapes
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Proposal repo: https://github.com/tc39/proposal-regexp-unicode-property-escapes
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@mathiasbynens
mathiasbynens committed Dec 5, 2017
1 parent 08b4a3f commit 625ee7d
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168 changes: 164 additions & 4 deletions spec.html
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Expand Up @@ -23,6 +23,15 @@
#ecma-logo {
width: 500px;
}
.unicode-property-table {
table-layout: fixed;
width: 100%;
font-size: 80%;
}
.unicode-property-table ul {
padding-left: 0;
list-style: none;
}
</style>
<script>
if (location.hostname === 'tc39.github.io' && location.protocol !== 'https:') {
Expand Down Expand Up @@ -29151,8 +29160,51 @@ <h2>Syntax</h2>
DecimalEscape ::
NonZeroDigit DecimalDigits? [lookahead &lt;! DecimalDigit]

CharacterClassEscape :: one of
`d` `D` `s` `S` `w` `W`
CharacterClassEscape[U] ::
`d`
`D`
`s`
`S`
`w`
`W`
[+U] `p{` UnicodePropertyValueExpression `}`
[+U] `P{` UnicodePropertyValueExpression `}`

UnicodePropertyValueExpression ::
UnicodePropertyName `=` UnicodePropertyValue
LoneUnicodePropertyNameOrValue

UnicodePropertyNameCharacter ::
ControlLetter
`_`

UnicodePropertyNameCharacters ::
UnicodePropertyNameCharacter UnicodePropertyNameCharacters?

UnicodePropertyName ::
UnicodePropertyNameCharacters

UnicodePropertyValueCharacter ::
UnicodePropertyNameCharacter
`0`
`1`
`2`
`3`
`4`
`5`
`6`
`7`
`8`
`9`

UnicodePropertyValueCharacters ::
UnicodePropertyValueCharacter UnicodePropertyValueCharacters?

UnicodePropertyValue ::
UnicodePropertyValueCharacters

LoneUnicodePropertyNameOrValue ::
UnicodePropertyValueCharacters

CharacterClass[U] ::
`[` [lookahead &lt;! {`^`}] ClassRanges[?U] `]`
Expand Down Expand Up @@ -29226,6 +29278,33 @@ <h1>Static Semantics: Early Errors</h1>
It is a Syntax Error if IsCharacterClass of |ClassAtomNoDash| is *false* and IsCharacterClass of |ClassAtom| is *false* and the CharacterValue of |ClassAtomNoDash| is larger than the CharacterValue of |ClassAtom|.
</li>
</ul>
<emu-grammar>UnicodePropertyName :: UnicodePropertyNameCharacters</emu-grammar>
<ul>
<li>
It is a Syntax Error if the List of Unicode code points that is SourceText of <emu-nt>UnicodePropertyName</emu-nt> is not identical to a List of Unicode code points that is a Unicode property name or property alias listed in the “Property name and aliases” column of <emu-xref href="#table-nonbinary-unicode-properties"></emu-xref> or <emu-xref href="#table-binary-unicode-properties"></emu-xref>.
</li>
</ul>
<emu-grammar>UnicodePropertyValue :: UnicodePropertyValueCharacters</emu-grammar>
<ul>
<li>
It is a Syntax Error if the List of Unicode code points that is SourceText of <emu-nt>UnicodePropertyValue</emu-nt> is not identical to a List of Unicode code points that is a value or value alias listed in the “Property value and aliases” column of <emu-xref href="#table-unicode-general-category-values"></emu-xref> and <emu-xref href="#table-unicode-script-values"></emu-xref>.
</li>
</ul>
<emu-grammar>UnicodePropertyValueExpression :: UnicodePropertyName `=` UnicodePropertyValue</emu-grammar>
<ul>
<li>
It is a Syntax Error if the List of Unicode code points that is SourceText of <emu-nt>UnicodePropertyName</emu-nt> is identical to a List of Unicode code points that is a Unicode binary property or binary property alias listed in the “Property name and aliases” column of <emu-xref href="#table-binary-unicode-properties"></emu-xref>.
</li>
<li>
It is a Syntax Error if the List of Unicode code points that is SourceText of <emu-nt>UnicodePropertyValue</emu-nt> is not identical to a List of Unicode code points that is a value or value alias for the Unicode property or property alias given by SourceText of <emu-nt>UnicodePropertyName</emu-nt> listed in the “Property value and aliases” column of the corresponding tables <emu-xref href="#table-unicode-general-category-values"></emu-xref> or <emu-xref href="#table-unicode-script-values"></emu-xref>.
</li>
</ul>
<emu-grammar>UnicodePropertyValueExpression :: LoneUnicodePropertyNameOrValue</emu-grammar>
<ul>
<li>
It is a Syntax Error if the List of Unicode code points that is SourceText of <emu-nt>LoneUnicodePropertyNameOrValue</emu-nt> is not identical to a List of Unicode code points that is a Unicode general category or general category alias listed in the “Property value and aliases” column of <emu-xref href="#table-unicode-general-category-values"></emu-xref>, nor a binary property or binary property alias listed in the “Property name and aliases” column of <emu-xref href="#table-binary-unicode-properties"></emu-xref>.
</li>
</ul>
</emu-clause>

<emu-clause id="sec-patterns-static-semantics-capturing-group-number">
Expand Down Expand Up @@ -29463,6 +29542,15 @@ <h1>Static Semantics: CharacterValue</h1>
1. Return the code point value of _ch_.
</emu-alg>
</emu-clause>

<emu-clause id="sec-static-semantics-sourcetext">
<h1>Static Semantics: SourceText</h1>
<emu-grammar>UnicodePropertyNameCharacters :: UnicodePropertyNameCharacter UnicodePropertyNameCharacters?</emu-grammar>
<emu-grammar>UnicodePropertyValueCharacters :: UnicodePropertyValueCharacter UnicodePropertyValueCharacters?</emu-grammar>
<emu-alg>
1. Return the List, in source text order, of Unicode code points in the source text matched by this production.
</emu-alg>
</emu-clause>
</emu-clause>

<!-- es6num="21.2.2" -->
Expand Down Expand Up @@ -30162,6 +30250,49 @@ <h1>Runtime Semantics: Canonicalize ( _ch_ )</h1>
<p>In case-insignificant matches when _Unicode_ is *true*, all characters are implicitly case-folded using the simple mapping provided by the Unicode standard immediately before they are compared. The simple mapping always maps to a single code point, so it does not map, for example, `"&szlig;"` (U+00DF) to `"SS"`. It may however map a code point outside the Basic Latin range to a character within, for example, `"&#x17f;"` (U+017F) to `"s"`. Such characters are not mapped if _Unicode_ is *false*. This prevents Unicode code points such as U+017F and U+212A from matching regular expressions such as `/[a-z]/i`, but they will match `/[a-z]/ui`.</p>
</emu-note>
</emu-clause>
<emu-clause id="sec-static-semantics-unicodematchproperty-p" aoid="UnicodeMatchProperty">
<h1>Static Semantics: UnicodeMatchProperty ( _p_ )</h1>
<p>The algorithm uses values from the following tables, which associate supported Unicode property names and property aliases and their canonical property names.</p>
<p>Implementations must support the following non-binary Unicode properties and their property aliases:</p>
<emu-import href="table-nonbinary-unicode-properties.html"></emu-import>
<p>Additionally, implementations must support the following binary Unicode properties and their property aliases:</p>
<emu-import href="table-binary-unicode-properties.html"></emu-import>
<p>The abstract operation UnicodeMatchProperty takes a parameter _p_ that is a List of Unicode code points and performs the following steps:</p>
<emu-alg>
1. Assert: _p_ is a List of Unicode code points that is identical to a List of Unicode code points that is a Unicode property name or property alias listed in the “Property name and aliases” column of <emu-xref href="#table-nonbinary-unicode-properties"></emu-xref> or <emu-xref href="#table-binary-unicode-properties"></emu-xref>.
1. Let _property_ be the canonical property name of _p_ as given in the “Canonical property name” column of the corresponding row.
1. Return the List of Unicode code points of _property_.
</emu-alg>
<p>To ensure interoperability, implementations must not extend Unicode property support to the remaining properties.</p>
<p>Implementations must only recognize the property aliases listed in <emu-xref href="#table-nonbinary-unicode-properties"></emu-xref> and <emu-xref href="#table-binary-unicode-properties"></emu-xref>.</p>
<p>Implementations must only recognize the property value aliases and canonical property value names listed in <emu-xref href="#table-unicode-general-category-values"></emu-xref> and <emu-xref href="#table-unicode-script-values"></emu-xref>.</p>
<emu-note>
<p>For example, `Script_Extensions` (property name) and `scx` (property alias) are valid, but `script_extensions` or `Scx` aren’t.</p>
</emu-note>
<emu-note>
<p>The listed properties form a superset of what <a href="https://unicode.org/reports/tr18/#RL1.2">UTS18 RL1.2</a> requires.</p>
</emu-note>
</emu-clause>
<emu-clause id="sec-static-semantics-unicodematchpropertyvalue-p-v" aoid="UnicodeMatchPropertyValue">
<h1>Static Semantics: UnicodeMatchPropertyValue ( _p_, _v_ )</h1>
<p>The algorithm uses values from the following tables, which associate canonical Unicode property names and their supported values and value aliases:</p>
<emu-import href="table-unicode-general-category-values.html"></emu-import>
<emu-import href="table-unicode-script-values.html"></emu-import>
<p>The abstract operation UnicodeMatchPropertyValue takes two parameters _p_ and _v_, each of which is a List of Unicode code points, and performs the following steps:</p>
<emu-alg>
1. Assert: _p_ is a List of Unicode code points that is identical to a List of Unicode code points that is a canonical, unaliased Unicode property name listed in the “Canonical property name” column of <emu-xref href="#table-nonbinary-unicode-properties"></emu-xref>.
1. Assert: _v_ is a List of Unicode code points that is identical to a List of Unicode code points that is a property value or property value alias for Unicode property _p_ listed in the “Property value and aliases” column of <emu-xref href="#table-unicode-general-category-values"></emu-xref> or <emu-xref href="#table-unicode-script-values"></emu-xref>.
1. Let _value_ be the canonical property value of _v_ as given in the “Canonical property value” column of the corresponding row.
1. Return the List of Unicode code points of _value_.
</emu-alg>
<p>Only the canonical property values and property value aliases listed in <emu-xref href="#table-unicode-general-category-values"></emu-xref> and <emu-xref href="#table-unicode-script-values"></emu-xref> must be recognized.</p>
<emu-note>
<p>For example, `Xpeo` and `Old_Persian` are valid `Script_Extension` values, but `xpeo` and `Old Persian` aren’t.</p>
</emu-note>
<emu-note>
<p>This algorithm differs from <a href="https://unicode.org/reports/tr44/#Matching_Symbolic">the matching rules for symbolic values listed in UAX44</a>: case, <emu-xref href="#sec-white-space">white space</emu-xref>, U+002D (HYPHEN-MINUS), and U+005F (LOW LINE) are not ignored, and the `Is` prefix is not supported.</p>
</emu-note>
</emu-clause>
</emu-clause>

<!-- es6num="21.2.2.9" -->
Expand Down Expand Up @@ -30258,6 +30389,23 @@ <h1>CharacterClassEscape</h1>
<emu-alg>
1. Return the set of all characters not included in the set returned by <emu-grammar>CharacterClassEscape :: `w`</emu-grammar> .
</emu-alg>
<p>The production <emu-grammar>CharacterClassEscape :: `\p{` UnicodePropertyValueExpression `}`</emu-grammar> evaluates by returning the CharSet containing all Unicode code points included in the CharSet returned by <emu-nt>UnicodePropertyValueExpression</emu-nt>.</p>
<p>The production <emu-grammar>CharacterClassEscape :: `\P{` UnicodePropertyValueExpression `}`</emu-grammar> evaluates by returning the CharSet containing all Unicode code points not included in the CharSet returned by <emu-nt>UnicodePropertyValueExpression</emu-nt>.</p>
<p>The production <emu-grammar>UnicodePropertyValueExpression :: UnicodePropertyName `=` UnicodePropertyValue</emu-grammar> evaluates as follows:</p>
<emu-alg>
1. Let _p_ be ! UnicodeMatchProperty(_UnicodePropertyName_).
1. Assert: _p_ is not a Unicode binary property or binary property alias listed in the “Property name and aliases” column of <emu-xref href="#table-binary-unicode-properties"></emu-xref>.
1. Let _v_ be ! UnicodeMatchPropertyValue(_p_, _UnicodePropertyValue_).
1. Return the CharSet containing all Unicode code points whose character database definition includes the property _p_ with value _v_.
</emu-alg>
<p>The production <emu-grammar>UnicodePropertyValueExpression :: LoneUnicodePropertyNameOrValue</emu-grammar> evaluates as follows:</p>
<emu-alg>
1. If ! UnicodeMatchPropertyValue(`"General_Category"`, _LoneUnicodePropertyNameOrValue_) is not identical to a List of Unicode code points that is the name of a Unicode general category or general category alias listed in the “Property value and aliases” column of <emu-xref href="#table-unicode-general-category-values"></emu-xref>, then
1. Return the CharSet containing all Unicode code points whose character database definition includes the property `General_Category` with value _LoneUnicodePropertyNameOrValue_.
1. Let _property_ be ! UnicodeMatchProperty(_LoneUnicodePropertyNameOrValue_).
1. Assert: _property_ is a binary Unicode property or binary property alias listed in the “Property name and aliases” column of <emu-xref href="#table-binary-unicode-properties"></emu-xref>.
1. Return the CharSet containing all Unicode code points whose character database definition includes the property _p_ with value |True|.
</emu-alg>
</emu-clause>

<!-- es6num="21.2.2.13" -->
Expand Down Expand Up @@ -40292,17 +40440,29 @@ <h1>Bibliography</h1>
<li>
<i>The Unicode Standard</i>, available at &lt;<a href="https://unicode.org/versions/latest">https://unicode.org/versions/latest</a>&gt;
</li>
<li>
<i>Unicode Technical Note #5: Canonical Equivalence in Applications</i>, available at &lt;<a href="https://unicode.org/notes/tn5/">https://unicode.org/notes/tn5/</a>&gt;
</li>
<li>
<i>Unicode Technical Standard #10: Unicode Collation Algorithm</i>, available at &lt;<a href="https://unicode.org/reports/tr10/">https://unicode.org/reports/tr10/</a>&gt;
</li>
<li>
<i>Unicode Standard Annex #15, Unicode Normalization Forms</i>, available at &lt;<a href="https://unicode.org/reports/tr15/">https://unicode.org/reports/tr15/</a>&gt;
</li>
<li>
<i>Unicode Standard Annex #18: Unicode Regular Expressions</i>, available at &lt;<a href="https://unicode.org/reports/tr18/">https://unicode.org/reports/tr18/</a>&gt;
</li>
<li>
<i>Unicode Standard Annex #24: Unicode `Script` Property</i>, available at &lt;<a href="https://unicode.org/reports/tr24/">https://unicode.org/reports/tr24/</a>&gt;
</li>
<li>
<i>Unicode Standard Annex #31, Unicode Identifiers and Pattern Syntax</i>, available at &lt;<a href="https://unicode.org/reports/tr31/">https://unicode.org/reports/tr31/</a>&gt;
</li>
<li>
<i>Unicode Technical Note #5: Canonical Equivalence in Applications</i>, available at &lt;<a href="https://unicode.org/notes/tn5/">https://unicode.org/notes/tn5/</a>&gt;
<i>Unicode Standard Annex #44: Unicode Character Database</i>, available at &lt;<a href="https://unicode.org/reports/tr44/">https://unicode.org/reports/tr44/</a>&gt;
</li>
<li>
<i>Unicode Technical Standard #10: Unicode Collation Algorithm</i>, available at &lt;<a href="https://unicode.org/reports/tr10/">https://unicode.org/reports/tr10/</a>&gt;
<i>Unicode Technical Standard #51: Unicode Emoji</i>, available at &lt;<a href="https://unicode.org/reports/tr51/">https://unicode.org/reports/tr51/</a>&gt;
</li>
<li>
<i>IANA Time Zone Database</i>, available at &lt;<a href="https://www.iana.org/time-zones">https://www.iana.org/time-zones</a>&gt;
Expand Down
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