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Merge pull request #7055 from mermaid-js/sequence-diagram-participant-name-parsing

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6853:  prevent browser freeze caused by invalid participant name in sequenceDiagram
This commit is contained in:
Shubham P
2025-10-13 13:12:08 +00:00
committed by GitHub
parent d80a638e55 6fecb985e8
commit a6276daffd
3 changed files with 22 additions and 3 deletions
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5
.changeset/curly-apes-prove.md Normal file
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@@ -0,0 +1,5 @@
---
'mermaid': patch
---
fix: Improve participant parsing and prevent recursive loops on invalid syntax

8
packages/mermaid/src/diagrams/sequence/parser/sequenceDiagram.jison
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@@ -32,13 +32,14 @@
<CONFIG>[^\}]+ { return 'CONFIG_CONTENT'; }
<CONFIG>\} { this.popState(); this.popState(); return 'CONFIG_END'; }
<ID>[^\<->\->:\n,;@\s]+(?=\@\{) { yytext = yytext.trim(); return 'ACTOR'; }
<ID>[^\<->\->:\n,;@]+?([\-]*[^\<->\->:\n,;@]+?)*?(?=((?!\n)\s)+"as"(?!\n)\s|[#\n;]|$) { yytext = yytext.trim(); this.begin('ALIAS'); return 'ACTOR'; }
<ID>[^<>:\n,;@\s]+(?=\s+as\s) { yytext = yytext.trim(); this.begin('ALIAS'); return 'ACTOR'; }
<ID>[^<>:\n,;@]+(?=\s*[\n;#]|$) { yytext = yytext.trim(); this.popState(); return 'ACTOR'; }
<ID>[^<>:\n,;@]*\<[^\n]* { this.popState(); return 'INVALID'; }
"box" { this.begin('LINE'); return 'box'; }
"participant" { this.begin('ID'); return 'participant'; }
"actor" { this.begin('ID'); return 'participant_actor'; }
"create" return 'create';
"destroy" { this.begin('ID'); return 'destroy'; }
<ID>[^<\->\->:\n,;]+?([\-]*[^<\->\->:\n,;]+?)*?(?=((?!\n)\s)+"as"(?!\n)\s|[#\n;]|$) { yytext = yytext.trim(); this.begin('ALIAS'); return 'ACTOR'; }
<ALIAS>"as" { this.popState(); this.popState(); this.begin('LINE'); return 'AS'; }
<ALIAS>(?:) { this.popState(); this.popState(); return 'NEWLINE'; }
"loop" { this.begin('LINE'); return 'loop'; }
@@ -145,6 +146,7 @@ line
: SPACE statement { $$ = $2 }
| statement { $$ = $1 }
| NEWLINE { $$=[]; }
| INVALID { $$=[]; }
;
box_section
@@ -411,4 +413,4 @@ text2
: TXT {$$ = yy.parseMessage($1.trim().substring(1)) }
;
%%
%%

12
packages/mermaid/src/diagrams/sequence/sequenceDiagram.spec.js
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@@ -2609,5 +2609,17 @@ Bob->>Alice:Got it!
expect(actors.get('E').type).toBe('entity');
expect(actors.get('E').description).toBe('E');
});
it('should handle fail parsing when alias token causes conflicts in participant definition', async () => {
let error = false;
try {
await Diagram.fromText(`
sequenceDiagram
participant SAS MyServiceWithMoreThan20Chars <br> service decription
`);
} catch (e) {
error = true;
}
expect(error).toBe(true);
});
});
});