Parser diverges instead of failing on ill-formed raw blocks

[thumphries]

Hello,

{{{{regular}}}} {{{{ expressions }}}} {{{{/expressions}}}} {{{{/  regular}}}}

Handlebars will diverge and eventually run out of memory on the above inputs. The culprit is the space before regular in the outer raw close. In the lexer, this seems like input that should be reasonably quickly rejected by https://github.com/wycats/handlebars.js/blob/master/src/handlebars.l#L54, so that makes me think the greedy match immediately below that is also culpable.

Note that whenever the closing raw block is invalid after a correct {{{{/ it seems to do the same thing:

{{{{regular}}}} {{{{ expressions }}}} {{{{/expressions}}}}  {{{{/awoeifjawoiefjaoiwejfoaiwejfio}}}

{{{{regular}}}} {{{{ expressions }}}} {{{{/expressions}}}}  {{{{/awoeifjawoiefjaoiwejfoaiwe

{{{{regular}}}} {{{{ expressions }}}} {{{{/expressions}}}}  {{{{/mary had a little lamb

[thumphries]

The nesting also appears to be irrelevant, i.e. it still crashes on

{{{{a}}}}{{{{/ a}}}}

==== JS stack trace =========================================

Security context: 0x1bc374d44a49 <JS Object>
    1: anonymous [/usr/local/lib/node_modules/handlebars/dist/cjs/handlebars/compiler/parser.js:~11] [pc=0x2e09dbfa2e8a] (this=0x35dfe0dfa821 <an Object with map 0x10a715869621>,yytext=0x1bc374dfdf89 <String[0]: >,yyleng=0,yylineno=0,yy=0x3a967ba8cdc9 <an Object with map 0x10a715869411>,yystate=10,$$=0x1bc374dfdf49 <JS Array[5]>,_$=0x1bc374dfdf69 <JS Array[5]>)
    2: parse [/usr/local/lib/node...

FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - process out of memory

[damncabbage]

Confirmed here with this jsfiddle: https://jsfiddle.net/9D88g/50/

(Don't click the link unless you want the browser to chew up a bunch of memory.)

[mootari]

Also running out of memory with:

{{{{raw}}}} {{{{/raw }}}}

[nknapp]

Seems to be fixed with #1578