Lexer: Allow an ERB delimiter inside a Ruby string

[marcoroth]

Supersedes #2655, which reached the same behavior through lexer string tracking. This takes the parseability route instead, so the lexer stays free of quote and heredoc state.

Also covers the one case left in #1548, <% x = '<%' %><%= x %>, now asserted with enforce_erubi_equality.

Resolves #1548
Resolves #2655

[github-actions]

🌿 Interactive Playground and Documentation Preview

A preview deployment has been built for this pull request. Try out the changes live in the interactive playground:

• Playground Preview
• Documentation Preview
• Website Preview

---

_{🌱 Grown from commit c652482}

---

✅ Preview deployment has been cleaned up.

[pkg-pr-new]

@herb-tools/analysis

npx https://pkg.pr.new/@herb-tools/analysis@2656

@herb-tools/browser

npx https://pkg.pr.new/@herb-tools/browser@2656

@herb-tools/client

npx https://pkg.pr.new/@herb-tools/client@2656

@herb-tools/config

npx https://pkg.pr.new/@herb-tools/config@2656

@herb-tools/core

npx https://pkg.pr.new/@herb-tools/core@2656

@herb-tools/dev-tools

npx https://pkg.pr.new/@herb-tools/dev-tools@2656

@herb-tools/formatter

npx https://pkg.pr.new/@herb-tools/formatter@2656

herb-language-server

npx https://pkg.pr.new/herb-language-server@2656

@herb-tools/highlighter

npx https://pkg.pr.new/@herb-tools/highlighter@2656

@herb-tools/language-server

npx https://pkg.pr.new/@herb-tools/language-server@2656

@herb-tools/language-service

npx https://pkg.pr.new/@herb-tools/language-service@2656

@herb-tools/linter

npx https://pkg.pr.new/@herb-tools/linter@2656

@herb-tools/minifier

npx https://pkg.pr.new/@herb-tools/minifier@2656

@herb-tools/node

npx https://pkg.pr.new/@herb-tools/node@2656

@herb-tools/node-wasm

npx https://pkg.pr.new/@herb-tools/node-wasm@2656

@herb-tools/printer

npx https://pkg.pr.new/@herb-tools/printer@2656

@herb-tools/rewriter

npx https://pkg.pr.new/@herb-tools/rewriter@2656

stimulus-lint

npx https://pkg.pr.new/stimulus-lint@2656

@herb-tools/tailwind-class-sorter

npx https://pkg.pr.new/@herb-tools/tailwind-class-sorter@2656

commit: c652482

[github-actions]

Corpus: this branch (0ba36c5) vs main (a840880)

	main (a840880)	this branch (0ba36c5)
Malformed templates	236	235	-1
Parse issues (all)	1067	1067	–
Compile issues	474	474	–
Files with line drift	87	87	–
Tags off their line	679	679	–
Clean files	36434	36434	–

Measured over 38006 templates from herb-corpus.

2 diagnostics changed count

Diagnostic	main (a840880)	this branch (0ba36c5)
NestedERBTagError	178	176	-2
ERBControlFlowScopeError	112	111	-1

A count can drop because a false positive was fixed, or because a diagnostic is no longer reported when it should be. Worth confirming which.

1 file got a better verdict

File	Was	Now
foreman/app/views/apipie_dsl/apipie_dsls/help.html.erb	template_error	strict_parse_error