highlightjs/highlight.js

(C++) Incorrect highlight of raw string literals

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#3,585 opened on Jul 16, 2022

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Description

Incorrect highlight of raw string literals

A raw string literal will cause any code following it to be highlighted as a string.

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Expected behavior

// just to show the error
vector<string> s({R"(JKhf2n"v; 0>qwv>q " JKhf2n"l0 "v42HHf&g )","4U \"N *+ "});
int other_code;  // just to show the error

Contributor guide

Tech stack
javascriptcpp
Domain
frontenddeveloper experience
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
C++ raw string literal syntaxhighlight.js grammar definition basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Examine the C++ language grammar file (likely src/languages/cpp.js) to identify the regex pattern handling string literals. The issue stems from raw string literals (R"...") causing subsequent code to be highlighted as a string. Study how the grammar currently matches strings and consider adding a specific rule for raw string literals. Review similar patterns in other language grammars (e.g., Python) for reference. Ensure the fix does not break other string literal types.