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170 lines
6.5 KiB
Markdown
170 lines
6.5 KiB
Markdown
### esutils [](http://travis-ci.org/estools/esutils)
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esutils ([esutils](http://github.com/estools/esutils)) is
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utility box for ECMAScript language tools.
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### API
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### ast
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#### ast.isExpression(node)
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Returns true if `node` is an Expression as defined in ECMA262 edition 5.1 section
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[11](https://es5.github.io/#x11).
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#### ast.isStatement(node)
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Returns true if `node` is a Statement as defined in ECMA262 edition 5.1 section
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[12](https://es5.github.io/#x12).
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#### ast.isIterationStatement(node)
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Returns true if `node` is an IterationStatement as defined in ECMA262 edition
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5.1 section [12.6](https://es5.github.io/#x12.6).
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#### ast.isSourceElement(node)
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Returns true if `node` is a SourceElement as defined in ECMA262 edition 5.1
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section [14](https://es5.github.io/#x14).
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#### ast.trailingStatement(node)
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Returns `Statement?` if `node` has trailing `Statement`.
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```js
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if (cond)
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consequent;
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```
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When taking this `IfStatement`, returns `consequent;` statement.
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#### ast.isProblematicIfStatement(node)
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Returns true if `node` is a problematic IfStatement. If `node` is a problematic `IfStatement`, `node` cannot be represented as an one on one JavaScript code.
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```js
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{
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type: 'IfStatement',
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consequent: {
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type: 'WithStatement',
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body: {
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type: 'IfStatement',
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consequent: {type: 'EmptyStatement'}
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}
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},
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alternate: {type: 'EmptyStatement'}
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}
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```
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The above node cannot be represented as a JavaScript code, since the top level `else` alternate belongs to an inner `IfStatement`.
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### code
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#### code.isDecimalDigit(code)
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Return true if provided code is decimal digit.
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#### code.isHexDigit(code)
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Return true if provided code is hexadecimal digit.
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#### code.isOctalDigit(code)
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Return true if provided code is octal digit.
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#### code.isWhiteSpace(code)
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Return true if provided code is white space. White space characters are formally defined in ECMA262.
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#### code.isLineTerminator(code)
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Return true if provided code is line terminator. Line terminator characters are formally defined in ECMA262.
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#### code.isIdentifierStart(code)
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Return true if provided code can be the first character of ECMA262 Identifier. They are formally defined in ECMA262.
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#### code.isIdentifierPart(code)
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Return true if provided code can be the trailing character of ECMA262 Identifier. They are formally defined in ECMA262.
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### keyword
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#### keyword.isKeywordES5(id, strict)
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Returns `true` if provided identifier string is a Keyword or Future Reserved Word
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in ECMA262 edition 5.1. They are formally defined in ECMA262 sections
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[7.6.1.1](http://es5.github.io/#x7.6.1.1) and [7.6.1.2](http://es5.github.io/#x7.6.1.2),
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respectively. If the `strict` flag is truthy, this function additionally checks whether
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`id` is a Keyword or Future Reserved Word under strict mode.
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#### keyword.isKeywordES6(id, strict)
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Returns `true` if provided identifier string is a Keyword or Future Reserved Word
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in ECMA262 edition 6. They are formally defined in ECMA262 sections
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[11.6.2.1](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-keywords) and
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[11.6.2.2](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-future-reserved-words),
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respectively. If the `strict` flag is truthy, this function additionally checks whether
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`id` is a Keyword or Future Reserved Word under strict mode.
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#### keyword.isReservedWordES5(id, strict)
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Returns `true` if provided identifier string is a Reserved Word in ECMA262 edition 5.1.
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They are formally defined in ECMA262 section [7.6.1](http://es5.github.io/#x7.6.1).
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If the `strict` flag is truthy, this function additionally checks whether `id`
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is a Reserved Word under strict mode.
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#### keyword.isReservedWordES6(id, strict)
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Returns `true` if provided identifier string is a Reserved Word in ECMA262 edition 6.
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They are formally defined in ECMA262 section [11.6.2](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-reserved-words).
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If the `strict` flag is truthy, this function additionally checks whether `id`
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is a Reserved Word under strict mode.
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#### keyword.isRestrictedWord(id)
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Returns `true` if provided identifier string is one of `eval` or `arguments`.
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They are restricted in strict mode code throughout ECMA262 edition 5.1 and
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in ECMA262 edition 6 section [12.1.1](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-identifiers-static-semantics-early-errors).
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#### keyword.isIdentifierName(id)
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Return true if provided identifier string is an IdentifierName as specified in
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ECMA262 edition 5.1 section [7.6](https://es5.github.io/#x7.6).
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#### keyword.isIdentifierES5(id, strict)
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Return true if provided identifier string is an Identifier as specified in
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ECMA262 edition 5.1 section [7.6](https://es5.github.io/#x7.6). If the `strict`
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flag is truthy, this function additionally checks whether `id` is an Identifier
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under strict mode.
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#### keyword.isIdentifierES6(id, strict)
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Return true if provided identifier string is an Identifier as specified in
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ECMA262 edition 6 section [12.1](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-identifiers).
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If the `strict` flag is truthy, this function additionally checks whether `id`
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is an Identifier under strict mode.
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### License
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Copyright (C) 2013 [Yusuke Suzuki](http://github.com/Constellation)
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(twitter: [@Constellation](http://twitter.com/Constellation)) and other contributors.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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