Preserve no break spaces in Latex to Unicode conversion by faneeshh · Pull Request #15174 · JabRef/jabref

faneeshh · 2026-02-21T01:35:32Z

Closes #15158
PR Description

I updated the Latex to Unicode conversion to ensure the tilde (~) is converted to a non breaking space (\u00a0) instead of a standard space and I should mention that I used a negative lookbehind regex to make sure this only affects standalone tildes and doesn't break Latex tilde accents like ~{n}. I think this would maintain support for accented characters.

Screenshot

Checklist

I own the copyright of the code submitted and I license it under the MIT license
I manually tested my changes in running JabRef (always required)
I added JUnit tests for changes (if applicable)
[/] I added screenshots in the PR description (if change is visible to the user)
I added a screenshot in the PR description showing a library with a single entry with me as author and as title the issue number
I described the change in CHANGELOG.md in a way that can be understood by the average user (if change is visible to the user)
I checked the user documentation for up to dateness and submitted a pull request to our user documentation repository

…sion

qodo-free-for-open-source-projects · 2026-02-21T01:35:50Z

Review Summary by Qodo

Fix LaTeX tilde to non-breaking space conversion

🐞 Bug fix

Walkthroughs

Description

• Replace LaTeX tildes with non-breaking spaces instead of standard spaces
• Use negative lookbehind regex to preserve LaTeX tilde accents like \~{n}
• Add test case for no-break space preservation in author names
• Update CHANGELOG with fix description

Diagram

flowchart LR
  A["LaTeX input with tilde"] -->|"negative lookbehind regex"| B["Standalone tildes identified"]
  B -->|"replace with \\u00a0"| C["Non-breaking space output"]
  D["LaTeX accents like \\~{n}"] -->|"not matched"| E["Preserved unchanged"]

File Changes

1. jablib/src/main/java/org/jabref/model/strings/LatexToUnicodeAdapter.java 🐞 Bug fix +2/-1

Implement non-breaking space conversion for LaTeX tildes
• Added regex pattern (?<!\\\\)~ to match standalone tildes not preceded by backslash
• Replace matched tildes with Unicode non-breaking space character \u00a0
• Preserve LaTeX tilde accents by using negative lookbehind assertion
jablib/src/main/java/org/jabref/model/strings/LatexToUnicodeAdapter.java

2. jablib/src/test/java/org/jabref/logic/layout/format/LatexToUnicodeFormatterTest.java 🧪 Tests +6/-1

Add tests for non-breaking space conversion
• Update existing test equationsMoreComplicatedFormatting to expect non-breaking space
• Add new test formatPreserveNoBreakSpaces to verify tilde conversion in author names
• Test case validates Y.~Matsumoto converts to Y.\u00a0Matsumoto
jablib/src/test/java/org/jabref/logic/layout/format/LatexToUnicodeFormatterTest.java

3. CHANGELOG.md 📝 Documentation +1/-0

Document LaTeX tilde conversion fix

• Add entry documenting fix for LaTeX tilde to non-breaking space conversion
• Reference issue #15158 in the changelog entry
• Place entry in Fixed section with appropriate formatting

CHANGELOG.md

qodo-free-for-open-source-projects · 2026-02-21T01:42:18Z

Code Review by Qodo

🐞 Bugs (2) 📘 Rule violations (3) 📎 Requirement gaps (0)

1. NBSP breaks SQL search 🐞 Bug ✓ Correctness

Description

LatexToUnicodeAdapter.format now emits NBSP for ~, and the search index stores this value as the
transformed field. Because search queries use LIKE/ILIKE against the transformed column without
normalizing whitespace, searching with a normal space may no longer match entries whose transformed
text contains NBSP.

Code

jablib/src/main/java/org/jabref/model/strings/LatexToUnicodeAdapter.java[R33-34]

+        String toFormat = inField.replaceAll("(?<!\\\\)~", "\u00a0");
+        toFormat = UNDERSCORE_MATCHER.matcher(toFormat).replaceAll(REPLACEMENT_CHAR);

Evidence
The adapter replaces ~ with NBSP, the indexer persists LatexToUnicodeAdapter.format(value) as
FIELD_VALUE_TRANSFORMED, and SQL search uses LIKE/ILIKE comparisons against
FIELD_VALUE_TRANSFORMED with user-provided terms. LIKE/ILIKE are character-based, so U+0020
(space) does not match U+00A0 (NBSP).
jablib/src/main/java/org/jabref/model/strings/LatexToUnicodeAdapter.java[32-35]
jablib/src/main/java/org/jabref/logic/search/indexing/BibFieldsIndexer.java[474-476]
jablib/src/main/java/org/jabref/logic/search/query/SearchToSqlVisitor.java[280-299]
jablib/src/main/java/org/jabref/logic/search/query/SearchToSqlVisitor.java[551-555]

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

## Issue description
`LatexToUnicodeAdapter` now converts LaTeX `~` to NBSP (U+00A0). This value is written into the search index’s transformed column and is then queried using SQL LIKE/ILIKE. Because LIKE/ILIKE are character-sensitive, search terms containing normal spaces (U+0020) will not match transformed content containing NBSP.
## Issue Context
The adapter is used for both UI-ish formatting and backend indexing/search normalization. Preserving NBSP for display is desirable, but indexing/search likely needs whitespace normalization to maintain expected matching behavior.
## Fix Focus Areas
- jablib/src/main/java/org/jabref/logic/search/indexing/BibFieldsIndexer.java[474-476]
- jablib/src/main/java/org/jabref/logic/search/query/SearchToSqlVisitor.java[222-263]
- jablib/src/main/java/org/jabref/model/strings/LatexToUnicodeAdapter.java[32-35]

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2. Inline regex in parse() ☑ 📘 Rule violation ➹ Performance

Description

parse() uses String.replaceAll with a nontrivial regex, which recompiles the pattern on each
call and reduces readability. This violates the rule to prefer compiled Pattern reuse for regex
operations where applicable.

Code

jablib/src/main/java/org/jabref/model/strings/LatexToUnicodeAdapter.java[33]
+        String toFormat = inField.replaceAll("(?<!\\\\)~", "\u00a0");

Evidence
PR Compliance ID 14 requires compiling and reusing regex patterns via Pattern.compile(...) and
matcher(...) where applicable; the changed line uses an inline regex replacement directly in
replaceAll.
AGENTS.md
jablib/src/main/java/org/jabref/model/strings/LatexToUnicodeAdapter.java[33-33]

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

## Issue description
`LatexToUnicodeAdapter.parse()` uses an inline regex via `String.replaceAll`, which recompiles the pattern each time and conflicts with the guideline to use compiled `Pattern`s for nontrivial regex.
## Issue Context
The replacement regex contains a negative lookbehind and runs as part of `parse()`, which may be called frequently.
## Fix Focus Areas
- jablib/src/main/java/org/jabref/model/strings/LatexToUnicodeAdapter.java[33-34]

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3. ~~Changelog uses Latex spelling~~ ☑ 📘 Rule violation ✓ Correctness

Description

The new changelog entry uses Latex instead of the standard LaTeX spelling, which is a
typographical/style mistake in user-facing documentation. This reduces professionalism and
consistency of written content.

Code

CHANGELOG.md[45]

+- We fixed an issue where Latex to Unicode conversion replaced tildes with standard spaces instead of non-breaking spaces. ([#15158](https://github.com/JabRef/jabref/issues/15158))

Evidence

PR Compliance ID 28 requires new/modified changelog text to be free of typographical/formatting
mistakes; the added line uses the nonstandard capitalization Latex instead of LaTeX.

CHANGELOG.md[45-45]
Best Practice: Learned patterns

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

## Issue description
The changelog entry contains a typographical/style issue: `Latex` should be `LaTeX`.
## Issue Context
This is user-facing documentation and should match established terminology/capitalization used in the project.
## Fix Focus Areas
- CHANGELOG.md[45-45]

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4. ~~Test name not self-documenting~~ ☑ 📘 Rule violation ✓ Correctness

Description

The new test method name formatPreserveNoBreakSpaces is grammatically awkward and uses a less
common term (NoBreak) instead of the clearer NonBreaking. This reduces readability and
self-documentation in tests.

Code

jablib/src/test/java/org/jabref/logic/layout/format/LatexToUnicodeFormatterTest.java[R209-210]
+    void formatPreserveNoBreakSpaces() {
+        assertEquals("Y.\u00a0Matsumoto", formatter.format("Y.~Matsumoto"));

Evidence
PR Compliance ID 2 requires meaningful, self-documenting names; the added test name is less clear
than a conventional alternative like formatPreservesNonBreakingSpaces.
Rule 2: Generic: Meaningful Naming and Self-Documenting Code
jablib/src/test/java/org/jabref/logic/layout/format/LatexToUnicodeFormatterTest.java[209-210]

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

## Issue description
The newly added test method name is not as clear/self-documenting as it could be.
## Issue Context
Test names serve as documentation for expected behavior; using conventional terminology improves readability.
## Fix Focus Areas
- jablib/src/test/java/org/jabref/logic/layout/format/LatexToUnicodeFormatterTest.java[209-211]

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5. Tilde after \\ not handled 🐞 Bug ✓ Correctness

Description

The negative lookbehind only converts ~ when not preceded by a backslash, so it will not convert
\~ (two backslashes then tilde). If such sequences are used in fields (and JabRef code treats them
as removable standalone tildes), NBSP preservation would be incomplete.

Code

jablib/src/main/java/org/jabref/model/strings/LatexToUnicodeAdapter.java[33]
+        String toFormat = inField.replaceAll("(?<!\\\\)~", "\u00a0");

Evidence
The replacement explicitly skips any tilde immediately preceded by \. JabRef’s own formatter tests
treat \\~ as a case where the tilde is not an accent command and should be processed (removed
there), suggesting it can appear as a standalone tilde in practice.
jablib/src/main/java/org/jabref/model/strings/LatexToUnicodeAdapter.java[32-34]
jablib/src/test/java/org/jabref/logic/layout/format/RemoveTildeTest.java[28-37]

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

## Issue description
The current negative-lookbehind replacement skips any `~` preceded by a backslash. This likely avoids breaking accent commands like `\~{n}`, but it also skips cases like `\\~` (two backslashes then tilde), which JabRef tests treat as a standalone tilde in other formatting contexts.
## Issue Context
Depending on intended LaTeX semantics in JabRef fields, `\\~` may represent a non-breaking space after a LaTeX command (or simply literal backslashes followed by a standalone tilde). If so, NBSP preservation would be incomplete.
## Fix Focus Areas
- jablib/src/main/java/org/jabref/model/strings/LatexToUnicodeAdapter.java[32-35]
- jablib/src/test/java/org/jabref/logic/layout/format/LatexToUnicodeFormatterTest.java[133-212]
- jablib/src/test/java/org/jabref/logic/layout/format/RemoveTildeTest.java[28-37]

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qodo-free-for-open-source-projects · 2026-02-21T01:42:18Z

+        String toFormat = inField.replaceAll("(?<!\\\\)~", "\u00a0");
+        toFormat = UNDERSCORE_MATCHER.matcher(toFormat).replaceAll(REPLACEMENT_CHAR);


1. Nbsp breaks sql search 🐞 Bug ✓ Correctness

LatexToUnicodeAdapter.format now emits NBSP for ~, and the search index stores this value as the transformed field. Because search queries use LIKE/ILIKE against the transformed column without normalizing whitespace, searching with a normal space may no longer match entries whose transformed text contains NBSP.

Agent Prompt

## Issue description `LatexToUnicodeAdapter` now converts LaTeX `~` to NBSP (U+00A0). This value is written into the search index’s transformed column and is then queried using SQL LIKE/ILIKE. Because LIKE/ILIKE are character-sensitive, search terms containing normal spaces (U+0020) will not match transformed content containing NBSP. ## Issue Context The adapter is used for both UI-ish formatting and backend indexing/search normalization. Preserving NBSP for display is desirable, but indexing/search likely needs whitespace normalization to maintain expected matching behavior. ## Fix Focus Areas - jablib/src/main/java/org/jabref/logic/search/indexing/BibFieldsIndexer.java[474-476] - jablib/src/main/java/org/jabref/logic/search/query/SearchToSqlVisitor.java[222-263] - jablib/src/main/java/org/jabref/model/strings/LatexToUnicodeAdapter.java[32-35]

ⓘ Copy this prompt and use it to remediate the issue with your preferred AI generation tools

…me to something more clear

github-actions · 2026-02-21T03:49:00Z

Your pull request conflicts with the target branch.

Please merge with your code. For a step-by-step guide to resolve merge conflicts, see https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/addressing-merge-conflicts/resolving-a-merge-conflict-using-the-command-line.

aniruddhkorde9-dot · 2026-02-21T15:32:40Z

Hello! I am a new contributor looking to get involved. I would love to work on this issue. Could you please assign it to me?

subhramit · 2026-02-21T19:25:56Z

Hello! I am a new contributor looking to get involved. I would love to work on this issue. Could you please assign it to me?

Are you aware that this is a PR and not an issue?

…atex-unicode-nbsp

ryan-carpenter · 2026-02-21T22:50:38Z


+    private static final Pattern TILDE_MATCHER = Pattern.compile("(?<!\\\\)~");
+
+    private static final String NON_BREAKING_SPACE = "\u00a0";


Suggested change

private static final String NON_BREAKING_SPACE = "\u00a0";

private static final String NO_BREAK_SPACE = "\u00a0";

The formal unicode character name is "no-break" space (https://www.unicode.org/charts/charindex.html), which I think is a better choice than the alternative name "non-breaking space" unless JabRef has a precedent of using the alternative. Thanks for the fix, @faneeshh.

ryan-carpenter · 2026-02-21T22:50:59Z

    /// @return an `Optional<String>` with LaTeX resolved into Unicode or `empty` on failure.
    public static Optional<String> parse(@NonNull String inField) {
-        String toFormat = UNDERSCORE_MATCHER.matcher(inField).replaceAll(REPLACEMENT_CHAR);
+        String toFormat = TILDE_MATCHER.matcher(inField).replaceAll(NON_BREAKING_SPACE);


Suggested change

String toFormat = TILDE_MATCHER.matcher(inField).replaceAll(NON_BREAKING_SPACE);

String toFormat = TILDE_MATCHER.matcher(inField).replaceAll(NO_BREAK_SPACE);

ryan-carpenter · 2026-02-21T22:51:37Z

    }
+
+    @Test
+    void formatPreservesNoBreakingSpaces() {


Suggested change

void formatPreservesNoBreakingSpaces() {

void formatPreservesNoBreakSpaces() {

ryan-carpenter · 2026-02-21T22:52:23Z


 ### Fixed

+- We fixed an issue where LaTeX to Unicode conversion replaced tildes with standard spaces instead of non-breaking spaces. ([#15158](https://github.com/JabRef/jabref/issues/15158))


Suggested change

- We fixed an issue where LaTeX to Unicode conversion replaced tildes with standard spaces instead of non-breaking spaces. ([#15158](https://github.com/JabRef/jabref/issues/15158))

- We fixed an issue where LaTeX to Unicode conversion replaced tildes with standard spaces instead of no-break spaces. ([#15158](https://github.com/JabRef/jabref/issues/15158))

Siedlerchr · 2026-02-23T22:25:21Z

8
BibEntryTest > getFieldOrAliasLatexFreeComplexConversionInAlias() FAILED
org.opentest4j.AssertionFailedError at BibEntryTest.java:243

faneeshh · 2026-02-23T23:24:31Z

8 BibEntryTest > getFieldOrAliasLatexFreeComplexConversionInAlias() FAILED org.opentest4j.AssertionFailedError at BibEntryTest.java:243

I'm guessing it's failing because it expects a standard space where I've now introduced the no-break space(\u00a0)? If that is the case then should I update the test's expected string to match the new Unicode char? Does that sound right

koppor · 2026-03-02T19:46:56Z

and DOIs.

Why? -- https://www.doi.org/resources/DOI_URI_Scheme.pdf does not contain any reference to ~

koppor · 2026-03-02T19:50:06Z

I'm guessing it's failing because it expects a standard space where I've now introduced the no-break space(\u00a0)? If that is the case then should I update the test's expected string to match the new Unicode char? Does that sound right

Yes, please - then we can easily see it if it s OK. Now, five people in a call are starring at the screen and not understanding anything.

Please do it ASAP.

…jabref into fix-latex-unicode-nbsp

faneeshh · 2026-03-02T21:15:43Z

and DOIs.

Why? -- https://www.doi.org/resources/DOI_URI_Scheme.pdf does not contain any reference to ~

I understand that real DOIs don't contain tildes per the DOI Scheme but the test 6 in CitationStyleGeneratorTest (10.1161/circ.108_827022~special) appeared to be a edge case to test unusual characters which is why I got confused probably. Anyways I've updated the tests to use the no-break space.

koppor · 2026-03-03T09:01:32Z

and DOIs.

Why? -- https://www.doi.org/resources/DOI_URI_Scheme.pdf does not contain any reference to ~

I understand that real DOIs don't contain tildes per the DOI Scheme but the test 6 in CitationStyleGeneratorTest (10.1161/circ.108_827022~special) appeared to be a edge case to test unusual characters which is why I got confused probably. Anyways I've updated the tests to use the no-break space.

Learning: Think "out of the box"

Go to https://doi.org/

Enter the doi with ~"

See

--> Test is wrong. When reviewing the test at hand, the reviewers did not see.

faneeshh · 2026-03-03T10:32:00Z

Learning: Think "out of the box"

Yeah learning something new with every PR I open... really grateful tho

testlens-app · 2026-03-03T14:41:39Z

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Source Code Tests / Unit tests – jabgui	:jabgui:test	DownloadLinkedFileActionTest > doesntReplaceSourceURL(boolean)	🔇
Source Code Tests / Unit tests – jabgui	:jabgui:test	DownloadLinkedFileActionTest > replacesLinkedFiles(Path)	🔇
Source Code Tests / Unit tests – jabgui	:jabgui:test	LinkedFileViewModelTest > downloadPdfFileWhenLinkedFilePointsToPdfUrl(boolean)	🔇

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…rg.openrewrite.recipe-rewrite-recipe-bom-3.25.0 * upstream/main: (35 commits) Chore: add dependency-management.md (#15278) Chore(deps): Bump dev.langchain4j:langchain4j-bom in /versions (#15277) New Crowdin updates (#15274) Chore(deps): Bump actions/upload-artifact from 6 to 7 (#15271) Chore(deps): Bump actions/download-artifact from 7 to 8 (#15270) Chore(deps): Bump docker/login-action from 3 to 4 (#15268) Fix threading issues in citations relations tab (#15233) Fix: Citavi XML importer now preserves citation keys (#14658) (#15257) Preserve no break spaces in Latex to Unicode conversion (#15174) Fix: open javafx.scene.control.skin to controlsfx (#15260) Reduce complexity in dependencies setup (restore) (#15194) New translations jabref_en.properties (French) (#15256) Fix: exception dialog shows up when moving sidepanel down/up (#15248) Implement reset for Name Display Preferences (#15136) Chore(deps): Bump net.bytebuddy:byte-buddy in /versions (#15252) Chore(deps): Bump io.zonky.test.postgres:embedded-postgres-binaries-bom (#15253) Chore(deps): Bump io.zonky.test:embedded-postgres in /versions (#15254) Chore(deps): Bump net.ltgt.errorprone from 5.0.0 to 5.1.0 in /jablib (#15251) New Crowdin updates (#15247) Refined the "Select files to import" page in "Search for unlinked local files" dialog (#15110) ...

Fix JabRef#15158: Preserve no break spaces in Latex to Unicode conver…

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Added pre compiled pattern for tilde matching and changed the test na…

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…me to something more clear

calixtus changed the title ~~Fix #15158: Preserve no break spaces in Latex to Unicode conversion~~ Preserve no break spaces in Latex to Unicode conversion Feb 21, 2026

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Merge remote-tracking branch 'upstream/main' into fork/faneeshh/fix-l…

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…atex-unicode-nbsp

Fix CHANGELOG.md

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Convert LaTeX to Unicode feature should preseve no-break spaces #15158

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Used no-break as the formal unicode character name

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Merge branch 'main' into fix-latex-unicode-nbsp

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Fix changelog

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Updated BibEntryTest to use No-Break space conversion

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Merge branch 'main' into fix-latex-unicode-nbsp

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Braces should be regarded as bad :) nbbrd/heylogs#499

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faneeshh added 2 commits March 2, 2026 13:11

Updated the tests to expect a non-break space

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Merge branch 'fix-latex-unicode-nbsp' of https://github.com/faneeshh/…

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		String toFormat = inField.replaceAll("(?<!\\\\)~", "\u00a0");
		toFormat = UNDERSCORE_MATCHER.matcher(toFormat).replaceAll(REPLACEMENT_CHAR);


		private static final Pattern TILDE_MATCHER = Pattern.compile("(?<!\\\\)~");

		private static final String NON_BREAKING_SPACE = "\u00a0";

	private static final String NON_BREAKING_SPACE = "\u00a0";
	private static final String NO_BREAK_SPACE = "\u00a0";

	String toFormat = TILDE_MATCHER.matcher(inField).replaceAll(NON_BREAKING_SPACE);
	String toFormat = TILDE_MATCHER.matcher(inField).replaceAll(NO_BREAK_SPACE);

	void formatPreservesNoBreakingSpaces() {
	void formatPreservesNoBreakSpaces() {


		### Fixed

		- We fixed an issue where LaTeX to Unicode conversion replaced tildes with standard spaces instead of non-breaking spaces. ([#15158](https://github.com/JabRef/jabref/issues/15158))

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faneeshh commented Feb 21, 2026 •

edited

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qodo-free-for-open-source-projects Bot commented Feb 21, 2026 •

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testlens-app Bot commented Mar 3, 2026 •

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