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Shift AST Specification

About

This document defines an interface for an abstract syntax tree that can be used to represent the structure of an ECMAScript program. The interface is intended to be able to represent any structurally valid ECMAScript program (according to the latest version of ECMA-262) while minimising the number of invalid programs that may be represented.

This specification is defined using the Web IDL standard with the following extended attributes:

  1. TypeIndicator: This extended attribute may be applied to a readonly attribute to indicate the following:
    • The type following the attribute keyword must be an identifier.
    • Declare an enum whose identifier is the type that follows the attribute keyword, whose values are the identifiers of all interfaces that inherit the attribute.
    • The value of the attribute is the member of the above-declared enum associated with the interface's identifier.
  2. NonEmpty: This extended attribute may be applied to any attribute with a Sequence or Array type to disallow the zero-length inhabitant of that type.

Status

This specification currently supports ECMAScript 2019 as defined in the latest version of ECMA-262 at the time of this writing. Stability of this data structure is not guaranteed between releases of ECMA-262.

Implementations

This section is reserved for a listing of implementations that conform to this specification as well as tools that operate on those data types. To add your own implementation to this list, please open a Pull Request. Implementations should be ordered by submission date within a category that appropriately describes their purpose.

Conform

Create

Transform

Analyse

Use

Design Decisions

The following design decisions showcase characteristics of the Shift AST design goals.

  • The concepts of Block and VariableDeclaration are separate from BlockStatement and VariableDeclarationStatement respectively in order to avoid usage of those statements where other types of statements are not allowed.
  • AssignmentExpression is separate from BinaryExpression because ES6 restricts the left operand of AssignmentExpression to bindings (12.14.1), and this restriction could be represented with a sufficiently advanced type system. Similarly, ComputedAssignmentExpression further restricts its left operand, and is consequently separated. All other binary expressions are grouped together.
  • RegExps and other exotic values are not used as primitives to allow for the possibility of serialisation to JSON.

Compromises

None right now!

License

Copyright 2014 Shape Security, Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

About

⏩ Shift AST Specification

shift-ast.org/

Resources

Readme
License
Activity
Custom properties

Stars

193 stars

Watchers

18 watching

Forks

18 forks
Report repository

Releases

Packages

Used by

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Shift AST Specification
About
This document defines an interface for an abstract syntax tree that can be used
to represent the structure of an ECMAScript program. The interface is intended
to be able to represent any structurally valid ECMAScript program (according to
the latest version of ECMA-262) while minimising the number of invalid programs
that may be represented.
This specification is defined using the Web IDL
standard with the following extended attributes:
  1. TypeIndicator: This extended attribute may be applied to a readonly
attribute to indicate the following:

    • The type following the attribute keyword must be an identifier.
    • Declare an enum whose identifier is the type that follows the
attribute keyword, whose values are the identifiers of all
interfaces that inherit the attribute.
    • The value of the attribute is the member of the above-declared enum
associated with the interface's identifier.
  2. NonEmpty: This extended attribute may be applied to any attribute with a
Sequence or Array type to disallow the zero-length inhabitant of that type.
Status
This specification currently supports ECMAScript 2019 as defined in the latest version of ECMA-262 at the time of this writing. Stability of this data structure is not guaranteed between releases of ECMA-262.
Implementations
This section is reserved for a listing of implementations that conform to this
specification as well as tools that operate on those data types. To add your
own implementation to this list, please open a Pull Request. Implementations
should be ordered by submission date within a category that appropriately
describes their purpose.
Conform
Create
Transform
Analyse
Use
Design Decisions
The following design decisions showcase characteristics of the Shift AST design
goals.
  • The concepts of Block and VariableDeclaration are separate from
BlockStatement and VariableDeclarationStatement respectively in order to
avoid usage of those statements where other types of statements are not
allowed.
  • AssignmentExpression is separate from BinaryExpression because ES6
restricts the left operand of AssignmentExpression to bindings (12.14.1),
and this restriction could be represented with a sufficiently advanced type
system. Similarly, ComputedAssignmentExpression further restricts its left
operand, and is consequently separated. All other binary expressions are
grouped together.
  • RegExps and other exotic values are not used as primitives to allow for the
possibility of serialisation to JSON.
Compromises
None right now!
License
Copyright 2014 Shape Security, Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

About
⏩ Shift AST Specification
shift-ast.org/
Resources
Readme
License
Activity
Custom properties
Stars
193 stars
Watchers
18 watching
Forks
18 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Shift AST Specification
About
This document defines an interface for an abstract syntax tree that can be used
to represent the structure of an ECMAScript program. The interface is intended
to be able to represent any structurally valid ECMAScript program (according to
the latest version of ECMA-262) while minimising the number of invalid programs
that may be represented.
This specification is defined using the Web IDL
standard with the following extended attributes:
  1. TypeIndicator: This extended attribute may be applied to a readonly
attribute to indicate the following:

    • The type following the attribute keyword must be an identifier.
    • Declare an enum whose identifier is the type that follows the
attribute keyword, whose values are the identifiers of all
interfaces that inherit the attribute.
    • The value of the attribute is the member of the above-declared enum
associated with the interface's identifier.
  2. NonEmpty: This extended attribute may be applied to any attribute with a
Sequence or Array type to disallow the zero-length inhabitant of that type.
Status
This specification currently supports ECMAScript 2019 as defined in the latest version of ECMA-262 at the time of this writing. Stability of this data structure is not guaranteed between releases of ECMA-262.
Implementations
This section is reserved for a listing of implementations that conform to this
specification as well as tools that operate on those data types. To add your
own implementation to this list, please open a Pull Request. Implementations
should be ordered by submission date within a category that appropriately
describes their purpose.
Conform
Create
Transform
Analyse
Use
Design Decisions
The following design decisions showcase characteristics of the Shift AST design
goals.
  • The concepts of Block and VariableDeclaration are separate from
BlockStatement and VariableDeclarationStatement respectively in order to
avoid usage of those statements where other types of statements are not
allowed.
  • AssignmentExpression is separate from BinaryExpression because ES6
restricts the left operand of AssignmentExpression to bindings (12.14.1),
and this restriction could be represented with a sufficiently advanced type
system. Similarly, ComputedAssignmentExpression further restricts its left
operand, and is consequently separated. All other binary expressions are
grouped together.
  • RegExps and other exotic values are not used as primitives to allow for the
possibility of serialisation to JSON.
Compromises
None right now!
License
Copyright 2014 Shape Security, Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

About
⏩ Shift AST Specification
shift-ast.org/
Resources
Readme
License
Activity
Custom properties
Stars
193 stars
Watchers
18 watching
Forks
18 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Shift AST Specification
About
This document defines an interface for an abstract syntax tree that can be used
to represent the structure of an ECMAScript program. The interface is intended
to be able to represent any structurally valid ECMAScript program (according to
the latest version of ECMA-262) while minimising the number of invalid programs
that may be represented.
This specification is defined using the Web IDL
standard with the following extended attributes:
  1. TypeIndicator: This extended attribute may be applied to a readonly
attribute to indicate the following:

    • The type following the attribute keyword must be an identifier.
    • Declare an enum whose identifier is the type that follows the
attribute keyword, whose values are the identifiers of all
interfaces that inherit the attribute.
    • The value of the attribute is the member of the above-declared enum
associated with the interface's identifier.
  2. NonEmpty: This extended attribute may be applied to any attribute with a
Sequence or Array type to disallow the zero-length inhabitant of that type.
Status
This specification currently supports ECMAScript 2019 as defined in the latest version of ECMA-262 at the time of this writing. Stability of this data structure is not guaranteed between releases of ECMA-262.
Implementations
This section is reserved for a listing of implementations that conform to this
specification as well as tools that operate on those data types. To add your
own implementation to this list, please open a Pull Request. Implementations
should be ordered by submission date within a category that appropriately
describes their purpose.
Conform
Create
Transform
Analyse
Use
Design Decisions
The following design decisions showcase characteristics of the Shift AST design
goals.
  • The concepts of Block and VariableDeclaration are separate from
BlockStatement and VariableDeclarationStatement respectively in order to
avoid usage of those statements where other types of statements are not
allowed.
  • AssignmentExpression is separate from BinaryExpression because ES6
restricts the left operand of AssignmentExpression to bindings (12.14.1),
and this restriction could be represented with a sufficiently advanced type
system. Similarly, ComputedAssignmentExpression further restricts its left
operand, and is consequently separated. All other binary expressions are
grouped together.
  • RegExps and other exotic values are not used as primitives to allow for the
possibility of serialisation to JSON.
Compromises
None right now!
License
Copyright 2014 Shape Security, Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

About
⏩ Shift AST Specification
shift-ast.org/
Resources
Readme
License
Activity
Custom properties
Stars
193 stars
Watchers
18 watching
Forks
18 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Shift AST Specification
About
This document defines an interface for an abstract syntax tree that can be used
to represent the structure of an ECMAScript program. The interface is intended
to be able to represent any structurally valid ECMAScript program (according to
the latest version of ECMA-262) while minimising the number of invalid programs
that may be represented.
This specification is defined using the Web IDL
standard with the following extended attributes:
  1. TypeIndicator: This extended attribute may be applied to a readonly
attribute to indicate the following:

    • The type following the attribute keyword must be an identifier.
    • Declare an enum whose identifier is the type that follows the
attribute keyword, whose values are the identifiers of all
interfaces that inherit the attribute.
    • The value of the attribute is the member of the above-declared enum
associated with the interface's identifier.
  2. NonEmpty: This extended attribute may be applied to any attribute with a
Sequence or Array type to disallow the zero-length inhabitant of that type.
Status
This specification currently supports ECMAScript 2019 as defined in the latest version of ECMA-262 at the time of this writing. Stability of this data structure is not guaranteed between releases of ECMA-262.
Implementations
This section is reserved for a listing of implementations that conform to this
specification as well as tools that operate on those data types. To add your
own implementation to this list, please open a Pull Request. Implementations
should be ordered by submission date within a category that appropriately
describes their purpose.
Conform
Create
Transform
Analyse
Use
Design Decisions
The following design decisions showcase characteristics of the Shift AST design
goals.
  • The concepts of Block and VariableDeclaration are separate from
BlockStatement and VariableDeclarationStatement respectively in order to
avoid usage of those statements where other types of statements are not
allowed.
  • AssignmentExpression is separate from BinaryExpression because ES6
restricts the left operand of AssignmentExpression to bindings (12.14.1),
and this restriction could be represented with a sufficiently advanced type
system. Similarly, ComputedAssignmentExpression further restricts its left
operand, and is consequently separated. All other binary expressions are
grouped together.
  • RegExps and other exotic values are not used as primitives to allow for the
possibility of serialisation to JSON.
Compromises
None right now!
License
Copyright 2014 Shape Security, Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

About
⏩ Shift AST Specification
shift-ast.org/
Resources
Readme
License
Activity
Custom properties
Stars
193 stars
Watchers
18 watching
Forks
18 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Shift AST Specification
About
This document defines an interface for an abstract syntax tree that can be used
to represent the structure of an ECMAScript program. The interface is intended
to be able to represent any structurally valid ECMAScript program (according to
the latest version of ECMA-262) while minimising the number of invalid programs
that may be represented.
This specification is defined using the Web IDL
standard with the following extended attributes:
  1. TypeIndicator: This extended attribute may be applied to a readonly
attribute to indicate the following:

    • The type following the attribute keyword must be an identifier.
    • Declare an enum whose identifier is the type that follows the
attribute keyword, whose values are the identifiers of all
interfaces that inherit the attribute.
    • The value of the attribute is the member of the above-declared enum
associated with the interface's identifier.
  2. NonEmpty: This extended attribute may be applied to any attribute with a
Sequence or Array type to disallow the zero-length inhabitant of that type.
Status
This specification currently supports ECMAScript 2019 as defined in the latest version of ECMA-262 at the time of this writing. Stability of this data structure is not guaranteed between releases of ECMA-262.
Implementations
This section is reserved for a listing of implementations that conform to this
specification as well as tools that operate on those data types. To add your
own implementation to this list, please open a Pull Request. Implementations
should be ordered by submission date within a category that appropriately
describes their purpose.
Conform
Create
Transform
Analyse
Use
Design Decisions
The following design decisions showcase characteristics of the Shift AST design
goals.
  • The concepts of Block and VariableDeclaration are separate from
BlockStatement and VariableDeclarationStatement respectively in order to
avoid usage of those statements where other types of statements are not
allowed.
  • AssignmentExpression is separate from BinaryExpression because ES6
restricts the left operand of AssignmentExpression to bindings (12.14.1),
and this restriction could be represented with a sufficiently advanced type
system. Similarly, ComputedAssignmentExpression further restricts its left
operand, and is consequently separated. All other binary expressions are
grouped together.
  • RegExps and other exotic values are not used as primitives to allow for the
possibility of serialisation to JSON.
Compromises
None right now!
License
Copyright 2014 Shape Security, Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

About
⏩ Shift AST Specification
shift-ast.org/
Resources
Readme
License
Activity
Custom properties
Stars
193 stars
Watchers
18 watching
Forks
18 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Shift AST Specification
About
This document defines an interface for an abstract syntax tree that can be used
to represent the structure of an ECMAScript program. The interface is intended
to be able to represent any structurally valid ECMAScript program (according to
the latest version of ECMA-262) while minimising the number of invalid programs
that may be represented.
This specification is defined using the Web IDL
standard with the following extended attributes:
  1. TypeIndicator: This extended attribute may be applied to a readonly
attribute to indicate the following:

    • The type following the attribute keyword must be an identifier.
    • Declare an enum whose identifier is the type that follows the
attribute keyword, whose values are the identifiers of all
interfaces that inherit the attribute.
    • The value of the attribute is the member of the above-declared enum
associated with the interface's identifier.
  2. NonEmpty: This extended attribute may be applied to any attribute with a
Sequence or Array type to disallow the zero-length inhabitant of that type.
Status
This specification currently supports ECMAScript 2019 as defined in the latest version of ECMA-262 at the time of this writing. Stability of this data structure is not guaranteed between releases of ECMA-262.
Implementations
This section is reserved for a listing of implementations that conform to this
specification as well as tools that operate on those data types. To add your
own implementation to this list, please open a Pull Request. Implementations
should be ordered by submission date within a category that appropriately
describes their purpose.
Conform
Create
Transform
Analyse
Use
Design Decisions
The following design decisions showcase characteristics of the Shift AST design
goals.
  • The concepts of Block and VariableDeclaration are separate from
BlockStatement and VariableDeclarationStatement respectively in order to
avoid usage of those statements where other types of statements are not
allowed.
  • AssignmentExpression is separate from BinaryExpression because ES6
restricts the left operand of AssignmentExpression to bindings (12.14.1),
and this restriction could be represented with a sufficiently advanced type
system. Similarly, ComputedAssignmentExpression further restricts its left
operand, and is consequently separated. All other binary expressions are
grouped together.
  • RegExps and other exotic values are not used as primitives to allow for the
possibility of serialisation to JSON.
Compromises
None right now!
License
Copyright 2014 Shape Security, Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

About
⏩ Shift AST Specification
shift-ast.org/
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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Shift AST Specification
About
This document defines an interface for an abstract syntax tree that can be used
to represent the structure of an ECMAScript program. The interface is intended
to be able to represent any structurally valid ECMAScript program (according to
the latest version of ECMA-262) while minimising the number of invalid programs
that may be represented.
This specification is defined using the Web IDL
standard with the following extended attributes:
  1. TypeIndicator: This extended attribute may be applied to a readonly
attribute to indicate the following:

    • The type following the attribute keyword must be an identifier.
    • Declare an enum whose identifier is the type that follows the
attribute keyword, whose values are the identifiers of all
interfaces that inherit the attribute.
    • The value of the attribute is the member of the above-declared enum
associated with the interface's identifier.
  2. NonEmpty: This extended attribute may be applied to any attribute with a
Sequence or Array type to disallow the zero-length inhabitant of that type.
Status
This specification currently supports ECMAScript 2019 as defined in the latest version of ECMA-262 at the time of this writing. Stability of this data structure is not guaranteed between releases of ECMA-262.
Implementations
This section is reserved for a listing of implementations that conform to this
specification as well as tools that operate on those data types. To add your
own implementation to this list, please open a Pull Request. Implementations
should be ordered by submission date within a category that appropriately
describes their purpose.
Conform
Create
Transform
Analyse
Use
Design Decisions
The following design decisions showcase characteristics of the Shift AST design
goals.
  • The concepts of Block and VariableDeclaration are separate from
BlockStatement and VariableDeclarationStatement respectively in order to
avoid usage of those statements where other types of statements are not
allowed.
  • AssignmentExpression is separate from BinaryExpression because ES6
restricts the left operand of AssignmentExpression to bindings (12.14.1),
and this restriction could be represented with a sufficiently advanced type
system. Similarly, ComputedAssignmentExpression further restricts its left
operand, and is consequently separated. All other binary expressions are
grouped together.
  • RegExps and other exotic values are not used as primitives to allow for the
possibility of serialisation to JSON.
Compromises
None right now!
License
Copyright 2014 Shape Security, Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

About
⏩ Shift AST Specification
shift-ast.org/
Resources
Readme
License
Activity
Custom properties
Stars
193 stars
Watchers
18 watching
Forks
18 forks
Report repository
Releases
Packages
Used by
Contributors
Languages