Add highlighting for escaped mustaches (#67, #106)#116
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A leading backslash escapes a mustache in Handlebars so it renders
literally: \{{foo}} outputs the text {{foo}} rather than evaluating it.
The grammar highlighted these as normal expressions, which is misleading.
Add an escaped_expression rule that matches a backslash followed by 2-3
opening braces and scopes it as constant.character.escape.handlebars. By
consuming the escaped braces, the remainder is left as plain text instead
of an expression (covering \{{foo}}, \{{{foo}}} and escaped blocks like
\{{#with}}). A negative lookbehind (?<!\\) ensures a double backslash
(\\{{foo}}) — which escapes the backslash, not the mustache — keeps its
normal expression highlighting.
Wired into the main patterns and the inline <script> template body across
all three grammar files. Adds test/escaping.test.js.
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A leading backslash escapes a mustache in Handlebars so it renders literally: {{foo}} outputs the text {{foo}} rather than evaluating it. The grammar highlighted these as normal expressions, which is misleading.
Add an escaped_expression rule that matches a backslash followed by 2-3 opening braces and scopes it as constant.character.escape.handlebars. By consuming the escaped braces, the remainder is left as plain text instead of an expression (covering {{foo}}, {{{foo}}} and escaped blocks like {{#with}}). A negative lookbehind (?<!\) ensures a double backslash (\{{foo}}) — which escapes the backslash, not the mustache — keeps its normal expression highlighting.
Wired into the main patterns and the inline <script> template body across all three grammar files. Adds test/escaping.test.js.