Support regular expressions in Terraform lexer (rouge-ruby#1490)

In Terraform, an interpolated expression can include a regular expression of the form `"/.../"`. This commit adds rules that identify regular expressions and a state for tokenising these expressions correctly.
NSHipster · May 21, 2020 · 14a8ae2 · 14a8ae2
1 parent fc036ac
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diff --git a/lib/rouge/lexers/terraform.rb b/lib/rouge/lexers/terraform.rb
@@ -81,9 +81,24 @@ def self.builtins
         mixin :expression
       end
 
+      state :regexps do
+        rule %r/"\// do
+          token Str::Delimiter
+          goto :regexp_inner
+        end
+      end
+
+      state :regexp_inner do
+        rule %r/[^"\/\\]+/, Str::Regex
+        rule %r/\\./, Str::Regex
+        rule %r/\/"/, Str::Delimiter, :pop!
+        rule %r/["\/]/, Str::Regex
+      end
+
       id = /[$a-z_\-][a-z0-9_\-]*/io
 
       state :expression do
+        mixin :regexps
         mixin :primitives
         rule %r/\s+/, Text
 

diff --git a/spec/visual/samples/terraform b/spec/visual/samples/terraform
@@ -79,3 +79,8 @@ resource "aws_subnet" "main" {
   vpc_id            = aws_vpc.main.id
   fqns              = aws_route53_record.cert_validation[*].fqdn
 }
+
+## Object with regular expression
+resource "aws_cloudfront_distribution" "s3_distribution" {
+  aliases = ["www.${replace(var.domain_name, "/\\.$/", "")}"]
+}