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lexer: fix expression to decode surrogate pairs #3278

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merged 1 commit into from Oct 19, 2021
Merged

lexer: fix expression to decode surrogate pairs #3278

merged 1 commit into from Oct 19, 2021

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Cito
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@Cito Cito commented Sep 28, 2021

When calculating the code point for a surrogate pair, the base code point of 0x10000 must be added, not bitwise ORed. Added some tests for catching this problem.

@IvanGoncharov
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@Cito Sorry for the long review time.
Can you please give a link to some document referencing this is the correct way to calculate surrogate pair?
Tried reviewing it a week ago and was stuck at google.com 😞

@IvanGoncharov IvanGoncharov added the PR: bug fix 🐞 requires increase of "patch" version number label Oct 12, 2021
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Cito commented Oct 13, 2021

Can you please give a link to some document referencing this is the correct way

Hi @IvanGoncharov - have a look at the C function decode_utf16_pair at the bottom of this page.

It doesn't matter whether you use '|' or '+' to combine the trailing and shifted leading values, because their bit patterns do not overlap. But you can't use '|' to add the 0x10000 offset, because its bit pattern overlaps with the shifted leading value.

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@Cito Thanks for the PR and explanation.
Looking at the source code, I learned we don't need this function, and we can use standard JS stuff.
But it is beyond the scope of this PR, and I will remove it in a separate PR.
This PR is still helpful since it adds more test and provide context why we added those tests.

@IvanGoncharov IvanGoncharov merged commit 7da9cd3 into graphql:main Oct 19, 2021
IvanGoncharov added a commit to IvanGoncharov/graphql-js that referenced this pull request Oct 19, 2021
@IvanGoncharov
Lexer: use standard JS functions to handle Unicode
34d27e9 
Context graphql#3278
@IvanGoncharov IvanGoncharov mentioned this pull request Oct 19, 2021
Merged
yaacovCR added a commit to yaacovCR/graphql-executor that referenced this pull request Nov 1, 2021
@yaacovCR @IvanGoncharov @Cito
Update dependencies (#50)
9e9653f 
* Export OperationTypeNode as value (graphql#3316)

* Convert const "enum-like" maps to TS enums (graphql#3317)

* Deprecate 'ASTKindToNode' (graphql#3318)

* Add message that we only support TS >= 4.1.0 (graphql#3319)

* Update deps (graphql#3320)

* 16.0.0-rc.5

* jsutils: add test for Path functions (graphql#2478)

Co-authored-by: Ivan Goncharov <ivan.goncharov.ua@gmail.com>

* lexer: fix expression to decode surrogate pairs (graphql#3278)

* Lexer: use standard JS functions to handle Unicode (graphql#3322)

* GraphQLError-test: merge check of source with rest of the properties (graphql#3324)

* GraphQLError: fix empty `locations` if error got nodes without locations (graphql#3325)

* GraphQLError: enumerate only spec prescribed properties (graphql#3326)

* GraphQLField: relax default value of TArgs to `any` (graphql#3328)

* 16.0.0-rc.6

* Fix release instructions (graphql#3329)

* use GITHUB_TOKEN (graphql#3330)

* GraphQLError: Add test to check order of fields in JSON.stringify (graphql#3336)

* Fix TS error caused by importing internal files directly (graphql#3339)

* Use default GITHUB_ACTOR if unset (graphql#3331)

Co-authored-by: Ivan Goncharov <ivan.goncharov.ua@gmail.com>

* 16.0.0-rc.7

* version: force proper typing on version literals

Types should be generic and stay the same across different versions
E.g. `preReleaseTag` should be typed `string | null` even if it's a
`null` literal for this particular release

* build-npm: fix type inference during TS declarations build

* version-test: fix validation of `versionInfo.preReleaseTag` (graphql#3345)

* 16.0.0

* checkgit.sh: Added a check for local modifications (graphql#3347)

* GraphQLError-test: text how extensions is inherited from originalError (graphql#3348)

* fix lockfile

* update graphql version

* Remove unused upstream file

* Upgrade deps

* add changeset

Co-authored-by: Ivan Goncharov <ivan.goncharov.ua@gmail.com>
Co-authored-by: Christoph Zwerschke <cito@online.de>
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