rouge-ruby · mlaggner · Nov 16, 2025
diff --git a/lib/rouge/lexers/abap.rb b/lib/rouge/lexers/abap.rb
@@ -2,6 +2,7 @@
 # frozen_string_literal: true
 
 # ABAP elements taken from http://help.sap.com/abapdocu_750/en/index.htm?file=abapdo.htm
+# Updated with modern ABAP 7.40+ and CDS keywords from ABAP 7.58 documentation
 
 module Rouge
   module Lexers
@@ -17,62 +18,62 @@ def self.keywords
           *-INPUT ?TO ABAP-SOURCE ABBREVIATED ABS ABSTRACT ACCEPT ACCEPTING
           ACCORDING ACCP ACTIVATION ACTUAL ADD ADD-CORRESPONDING ADJACENT
           AFTER ALIAS ALIASES ALIGN ALL ALLOCATE ALPHA ANALYSIS ANALYZER AND
-          ANY APPEND APPENDAGE APPENDING APPLICATION ARCHIVE AREA ARITHMETIC
-          AS ASCENDING ASPECT ASSERT ASSIGN ASSIGNED ASSIGNING ASSOCIATION
-          ASYNCHRONOUS AT ATTRIBUTES AUTHORITY AUTHORITY-CHECK AVG BACK
-          BACKGROUND BACKUP BACKWARD BADI BASE BEFORE BEGIN BETWEEN BIG BINARY
-          BINTOHEX BIT BIT-AND BIT-NOT BIT-OR BIT-XOR BLACK BLANK BLANKS BLOB
-          BLOCK BLOCKS BLUE BOUND BOUNDARIES BOUNDS BOXED BREAK-POINT BT
-          BUFFER BY BYPASSING BYTE BYTE-CA BYTE-CN BYTE-CO BYTE-CS BYTE-NA
-          BYTE-NS BYTE-ORDER CA CALL CALLING CASE CAST CASTING CATCH CEIL
-          CENTER CENTERED CHAIN CHAIN-INPUT CHAIN-REQUEST CHANGE CHANGING
-          CHANNELS CHAR CHAR-TO-HEX CHARACTER CHECK CHECKBOX CIRCULAR CLASS
-          CLASS-CODING CLASS-DATA CLASS-EVENTS CLASS-METHODS CLASS-POOL
-          CLEANUP CLEAR CLIENT CLNT CLOB CLOCK CLOSE CN CO COALESCE CODE
-          CODING COLLECT COLOR COLUMN COLUMNS COL_BACKGROUND COL_GROUP
-          COL_HEADING COL_KEY COL_NEGATIVE COL_NORMAL COL_POSITIVE COL_TOTAL
-          COMMENT COMMENTS COMMIT COMMON COMMUNICATION COMPARING COMPONENT
-          COMPONENTS COMPRESSION COMPUTE CONCAT CONCATENATE CONCAT_WITH_SPACE
-          COND CONDENSE CONDITION CONNECT CONNECTION CONSTANTS CONTEXT
-          CONTEXTS CONTINUE CONTROL CONTROLS CONV CONVERSION CONVERT COPIES
-          COPY CORRESPONDING COUNT COUNTRY COVER CP CPI CREATE CREATING
-          CRITICAL CS CUKY CURR CURRENCY CURRENCY_CONVERSION CURRENT CURSOR
-          CURSOR-SELECTION CUSTOMER CUSTOMER-FUNCTION CX_DYNAMIC_CHECK
-          CX_NO_CHECK CX_ROOT CX_SQL_EXCEPTION CX_STATIC_CHECK DANGEROUS DATA
-          DATABASE DATAINFO DATASET DATE DATS DATS_ADD_DAYS DATS_ADD_MONTHS
-          DATS_DAYS_BETWEEN DATS_IS_VALID DAYLIGHT DD/MM/YY DD/MM/YYYY DDMMYY
-          DEALLOCATE DEC DECIMALS DECIMAL_SHIFT DECLARATIONS DEEP DEFAULT
-          DEFERRED DEFINE DEFINING DEFINITION DELETE DELETING DEMAND
-          DEPARTMENT DESCENDING DESCRIBE DESTINATION DETAIL DF16_DEC DF16_RAW
-          DF16_SCL DF34_DEC DF34_RAW DF34_SCL DIALOG DIRECTORY DISCONNECT
-          DISPLAY DISPLAY-MODE DISTANCE DISTINCT DIV DIVIDE
-          DIVIDE-CORRESPONDING DIVISION DO DUMMY DUPLICATE DUPLICATES DURATION
-          DURING DYNAMIC DYNPRO E EDIT EDITOR-CALL ELSE ELSEIF EMPTY ENABLED
-          ENABLING ENCODING END END-ENHANCEMENT-SECTION END-LINES
-          END-OF-DEFINITION END-OF-FILE END-OF-PAGE END-OF-SELECTION
-          END-TEST-INJECTION END-TEST-SEAM ENDAT ENDCASE ENDCATCH ENDCHAIN
-          ENDCLASS ENDDO ENDENHANCEMENT ENDEXEC ENDFORM ENDFUNCTION ENDIAN
-          ENDIF ENDING ENDINTERFACE ENDLOOP ENDMETHOD ENDMODULE ENDON
-          ENDPROVIDE ENDSELECT ENDTRY ENDWHILE ENDWITH ENGINEERING ENHANCEMENT
-          ENHANCEMENT-POINT ENHANCEMENT-SECTION ENHANCEMENTS ENTRIES ENTRY
-          ENVIRONMENT EQ EQUIV ERRORMESSAGE ERRORS ESCAPE ESCAPING EVENT
-          EVENTS EXACT EXCEPT EXCEPTION EXCEPTION-TABLE EXCEPTIONS EXCLUDE
-          EXCLUDING EXEC EXECUTE EXISTS EXIT EXIT-COMMAND EXPAND EXPANDING
-          EXPIRATION EXPLICIT EXPONENT EXPORT EXPORTING EXTEND EXTENDED
-          EXTENSION EXTRACT FAIL FETCH FIELD FIELD-GROUPS FIELD-SYMBOL
-          FIELD-SYMBOLS FIELDS FILE FILTER FILTER-TABLE FILTERS FINAL FIND
-          FIRST FIRST-LINE FIXED-POINT FKEQ FKGE FLOOR FLTP FLUSH FONT FOR
-          FORM FORMAT FORWARD FOUND FRAME FRAMES FREE FRIENDS FROM FUNCTION
-          FUNCTION-POOL FUNCTIONALITY FURTHER GAPS GE GENERATE GET
-          GET_PRINT_PARAMETERS GIVING GKEQ GKGE GLOBAL GRANT GREEN GROUP
-          GROUPS GT HANDLE HANDLER HARMLESS HASHED HAVING HDB HEAD-LINES
-          HEADER HEADERS HEADING HELP-ID HELP-REQUEST HEXTOBIN HIDE HIGH HINT
-          HOLD HOTSPOT I ICON ID IDENTIFICATION IDENTIFIER IDS IF
-          IF_ABAP_CLOSE_RESOURCE IF_ABAP_CODEPAGE IF_ABAP_DB_BLOB_HANDLE
-          IF_ABAP_DB_CLOB_HANDLE IF_ABAP_DB_LOB_HANDLE IF_ABAP_DB_READER
-          IF_ABAP_DB_WRITER IF_ABAP_READER IF_ABAP_WRITER IF_MESSAGE
-          IF_OS_CA_INSTANCE IF_OS_CA_PERSISTENCY IF_OS_FACTORY IF_OS_QUERY
-          IF_OS_QUERY_MANAGER IF_OS_QUERY_OPTIONS IF_OS_STATE
+          ANNOTATION ANNOTATIONS ANY APPEND APPENDAGE APPENDING APPLICATION
+          ARCHIVE AREA ARITHMETIC AS ASCENDING ASPECT ASSERT ASSIGN ASSIGNED
+          ASSIGNING ASSOCIATION ASSOCIATIONS ASYNCHRONOUS AT ATTRIBUTES
+          AUTHORITY AUTHORITY-CHECK AVG BACK BACKGROUND BACKUP BACKWARD BADI
+          BASE BEFORE BEGIN BETWEEN BIG BINARY BINTOHEX BIT BIT-AND BIT-NOT
+          BIT-OR BIT-XOR BLACK BLANK BLANKS BLOB BLOCK BLOCKS BLUE BOUND
+          BOUNDARIES BOUNDS BOXED BREAK-POINT BT BUFFER BY BYPASSING BYTE
+          BYTE-CA BYTE-CN BYTE-CO BYTE-CS BYTE-NA BYTE-NS BYTE-ORDER CA CALL
+          CALLING CASE CAST CASTING CATCH CEIL CENTER CENTERED CHAIN
+          CHAIN-INPUT CHAIN-REQUEST CHANGE CHANGING CHANNELS CHAR CHAR-TO-HEX
+          CHARACTER CHECK CHECKBOX CIRCULAR CLASS CLASS-CODING CLASS-DATA
+          CLASS-EVENTS CLASS-METHODS CLASS-POOL CLEANUP CLEAR CLIENT CLNT CLOB
+          CLOCK CLOSE CN CO COALESCE CODE CODING COLLECT COLOR COLUMN COLUMNS
+          COL_BACKGROUND COL_GROUP COL_HEADING COL_KEY COL_NEGATIVE COL_NORMAL
+          COL_POSITIVE COL_TOTAL COMMENT COMMENTS COMMIT COMMON COMMUNICATION
+          COMPARING COMPONENT COMPONENTS COMPOSITION COMPRESSION COMPUTE
+          CONCAT CONCATENATE CONCAT_WITH_SPACE COND CONDENSE CONDITION CONNECT
+          CONNECTION CONSTANTS CONTEXT CONTEXTS CONTINUE CONTROL CONTROLS CONV
+          CONVERSION CONVERT COPIES COPY CORRESPONDING COUNT COUNTRY COVER CP
+          CPI CREATE CREATING CRITICAL CS CUKY CURR CURRENCY
+          CURRENCY_CONVERSION CURRENT CURSOR CURSOR-SELECTION CUSTOMER
+          CUSTOMER-FUNCTION CX_DYNAMIC_CHECK CX_NO_CHECK CX_ROOT
+          CX_SQL_EXCEPTION CX_STATIC_CHECK DANGEROUS DATA DATABASE DATAINFO
+          DATASET DATE DATS DATS_ADD_DAYS DATS_ADD_MONTHS DATS_DAYS_BETWEEN
+          DATS_IS_VALID DAYLIGHT DD/MM/YY DD/MM/YYYY DDMMYY DEALLOCATE DEC
+          DECIMALS DECIMAL_SHIFT DECLARATIONS DEEP DEFAULT DEFERRED DEFINE
+          DEFINING DEFINITION DELETE DELETING DEMAND DEPARTMENT DESCENDING
+          DESCRIBE DESTINATION DETAIL DF16_DEC DF16_RAW DF16_SCL DF34_DEC
+          DF34_RAW DF34_SCL DIALOG DIRECTORY DISCONNECT DISPLAY DISPLAY-MODE
+          DISTANCE DISTINCT DIV DIVIDE DIVIDE-CORRESPONDING DIVISION DO DUMMY
+          DUPLICATE DUPLICATES DURATION DURING DYNAMIC DYNPRO E EDIT
+          EDITOR-CALL ELSE ELSEIF EMPTY ENABLED ENABLING ENCODING END
+          END-ENHANCEMENT-SECTION END-LINES END-OF-DEFINITION END-OF-FILE
+          END-OF-PAGE END-OF-SELECTION END-TEST-INJECTION END-TEST-SEAM ENDAT
+          ENDCASE ENDCATCH ENDCHAIN ENDCLASS ENDDO ENDENHANCEMENT ENDEXEC
+          ENDFORM ENDFUNCTION ENDIAN ENDIF ENDING ENDINTERFACE ENDLOOP
+          ENDMETHOD ENDMODULE ENDON ENDPROVIDE ENDSELECT ENDTRY ENDWHILE
+          ENDWITH ENGINEERING ENHANCEMENT ENHANCEMENT-POINT ENHANCEMENT-SECTION
+          ENHANCEMENTS ENTITIES ENTITY ENTRIES ENTRY ENUM ENVIRONMENT EQ EQUIV
+          ERRORMESSAGE ERRORS ESCAPE ESCAPING EVENT EVENTS EXACT EXCEPT
+          EXCEPTION EXCEPTION-TABLE EXCEPTIONS EXCLUDE EXCLUDING EXEC EXECUTE
+          EXISTS EXIT EXIT-COMMAND EXPAND EXPANDING EXPIRATION EXPLICIT
+          EXPONENT EXPORT EXPORTING EXTEND EXTENDED EXTENSION EXTRACT FAIL
+          FETCH FIELD FIELD-GROUPS FIELD-SYMBOL FIELD-SYMBOLS FIELDS FILE
+          FILTER FILTER-TABLE FILTERS FINAL FIND FIRST FIRST-LINE FIXED-POINT
+          FKEQ FKGE FLOOR FLTP FLUSH FONT FOR FORM FORMAT FORWARD FOUND FRAME
+          FRAMES FREE FRIENDS FROM FUNCTION FUNCTION-POOL FUNCTIONALITY
+          FURTHER GAPS GE GENERATE GET GET_PRINT_PARAMETERS GIVING GKEQ GKGE
+          GLOBAL GRANT GREEN GROUP GROUPS GT HANDLE HANDLER HARMLESS HASHED
+          HAVING HDB HEAD-LINES HEADER HEADERS HEADING HELP-ID HELP-REQUEST
+          HEXTOBIN HIDE HIGH HINT HOLD HOTSPOT I ICON ID IDENTIFICATION
+          IDENTIFIER IDS IF IF_ABAP_CLOSE_RESOURCE IF_ABAP_CODEPAGE
+          IF_ABAP_DB_BLOB_HANDLE IF_ABAP_DB_CLOB_HANDLE IF_ABAP_DB_LOB_HANDLE
+          IF_ABAP_DB_READER IF_ABAP_DB_WRITER IF_ABAP_READER IF_ABAP_WRITER
+          IF_MESSAGE IF_OS_CA_INSTANCE IF_OS_CA_PERSISTENCY IF_OS_FACTORY
+          IF_OS_QUERY IF_OS_QUERY_MANAGER IF_OS_QUERY_OPTIONS IF_OS_STATE
           IF_OS_TRANSACTION IF_OS_TRANSACTION_MANAGER IF_SERIALIZABLE_OBJECT
           IF_SHM_BUILD_INSTANCE IF_SYSTEM_UUID IF_T100_DYN_MSG IF_T100_MESSAGE
           IGNORE IGNORING IMMEDIATELY IMPLEMENTATION IMPLEMENTATIONS
@@ -87,7 +88,7 @@ def self.keywords
           LET LEVEL LEVELS LIKE LINE LINE-COUNT LINE-SELECTION LINE-SIZE
           LINEFEED LINES LIST LIST-PROCESSING LISTBOX LITTLE LLANG LOAD
           LOAD-OF-PROGRAM LOB LOCAL LOCALE LOCATOR LOG-POINT LOGFILE LOGICAL
-          LONG LOOP LOW LOWER LPAD LPI LRAW LT LTRIM M MAIL MAIN MAJOR-ID
+          LONG LOOP LOW LOWER LPAD LPI LRAW LT LTRIM M MAIL MAIN MAJOR-ID MANY
           MAPPING MARGIN MARK MASK MATCH MATCHCODE MAX MAXIMUM MEDIUM MEMBERS
           MEMORY MESH MESSAGE MESSAGE-ID MESSAGES MESSAGING METHOD METHODS MIN
           MINIMUM MINOR-ID MM/DD/YY MM/DD/YYYY MMDDYY MOD MODE MODIF MODIFIER
@@ -97,23 +98,23 @@ def self.keywords
           NO-GAP NO-GAPS NO-GROUPING NO-HEADING NO-SCROLLING NO-SIGN NO-TITLE
           NO-TOPOFPAGE NO-ZERO NODE NODES NON-UNICODE NON-UNIQUE NOT NP NS
           NULL NUMBER NUMC O OBJECT OBJECTS OBLIGATORY OCCURRENCE OCCURRENCES
-          OCCURS OF OFF OFFSET ON ONLY OPEN OPTION OPTIONAL OPTIONS OR ORDER
-          OTHER OTHERS OUT OUTER OUTPUT OUTPUT-LENGTH OVERFLOW OVERLAY PACK
-          PACKAGE PAD PADDING PAGE PAGES PARAMETER PARAMETER-TABLE PARAMETERS
-          PART PARTIALLY PATTERN PERCENTAGE PERFORM PERFORMING PERSON PF
-          PF-STATUS PINK PLACES POOL POSITION POS_HIGH POS_LOW PRAGMAS PREC
-          PRECOMPILED PREFERRED PRESERVING PRIMARY PRINT PRINT-CONTROL
-          PRIORITY PRIVATE PROCEDURE PROCESS PROGRAM PROPERTY PROTECTED
-          PROVIDE PUBLIC PUSH PUSHBUTTON PUT QUAN QUEUE-ONLY QUICKINFO
-          RADIOBUTTON RAISE RAISING RANGE RANGES RAW RAWSTRING READ READ-ONLY
-          READER RECEIVE RECEIVED RECEIVER RECEIVING RED REDEFINITION REDUCE
-          REDUCED REF REFERENCE REFRESH REGEX REJECT REMOTE RENAMING REPLACE
-          REPLACEMENT REPLACING REPORT REQUEST REQUESTED RESERVE RESET
+          OCCURS OF OFF OFFSET ON ONE ONLY OPEN OPTION OPTIONAL OPTIONS OR
+          ORDER OTHER OTHERS OUT OUTER OUTPUT OUTPUT-LENGTH OVERFLOW OVERLAY
+          PACK PACKAGE PAD PADDING PAGE PAGES PARAMETER PARAMETER-TABLE
+          PARAMETERS PART PARTIALLY PATTERN PERCENTAGE PERFORM PERFORMING
+          PERSON PF PF-STATUS PINK PLACES POOL POSITION POS_HIGH POS_LOW
+          PRAGMAS PREC PRECOMPILED PREFERRED PRESERVING PRIMARY PRINT
+          PRINT-CONTROL PRIORITY PRIVATE PROCEDURE PROCESS PROGRAM PROPERTY
+          PROTECTED PROVIDE PUBLIC PUSH PUSHBUTTON PUT QUAN QUEUE-ONLY
+          QUICKINFO RADIOBUTTON RAISE RAISING RANGE RANGES RAW RAWSTRING READ
+          READ-ONLY READER RECEIVE RECEIVED RECEIVER RECEIVING RED REDEFINITION
+          REDUCE REDUCED REF REFERENCE REFRESH REGEX REJECT REMOTE RENAMING
+          REPLACE REPLACEMENT REPLACING REPORT REQUEST REQUESTED RESERVE RESET
           RESOLUTION RESPECTING RESPONSIBLE RESULT RESULTS RESUMABLE RESUME
           RETRY RETURN RETURNCODE RETURNING RETURNS RIGHT RIGHT-JUSTIFIED
           RIGHTPLUS RIGHTSPACE RISK RMC_COMMUNICATION_FAILURE
           RMC_INVALID_STATUS RMC_SYSTEM_FAILURE ROLE ROLLBACK ROUND ROWS RPAD
-          RTRIM RUN SAP SAP-SPOOL SAVING SCALE_PRESERVING
+          RTRIM RUN SAP SAP-SPOOL SAVING SCALAR SCALE_PRESERVING
           SCALE_PRESERVING_SCIENTIFIC SCAN SCIENTIFIC
           SCIENTIFIC_WITH_LEADING_ZERO SCREEN SCROLL SCROLL-BOUNDARY SCROLLING
           SEARCH SECONDARY SECONDS SECTION SELECT SELECT-OPTIONS SELECTION
@@ -123,8 +124,8 @@ def self.keywords
           SMART SOME SORT SORTABLE SORTED SOURCE SPACE SPECIFIED SPLIT SPOOL
           SPOTS SQL SQLSCRIPT SSTRING STABLE STAMP STANDARD START-OF-SELECTION
           STARTING STATE STATEMENT STATEMENTS STATIC STATICS STATUSINFO
-          STEP-LOOP STOP STRING STRUCTURE STRUCTURES STYLE SUBKEY SUBMATCHES
-          SUBMIT SUBROUTINE SUBSCREEN SUBSTRING SUBTRACT
+          STEP-LOOP STEP STOP STRING STRUCTURE STRUCTURES STYLE SUBKEY
+          SUBMATCHES SUBMIT SUBROUTINE SUBSCREEN SUBSTRING SUBTRACT
           SUBTRACT-CORRESPONDING SUFFIX SUM SUMMARY SUMMING SUPPLIED SUPPLY
           SUPPRESS SWITCH SWITCHSTATES SYMBOL SYNCPOINTS SYNTAX SYNTAX-CHECK
           SYNTAX-TRACE SYST SYSTEM-CALL SYSTEM-EXCEPTIONS SYSTEM-EXIT TAB
@@ -147,23 +148,26 @@ def self.keywords
 
       def self.builtins
         @keywords = Set.new %w(
-          acos apply asin assign atan attribute bit-set boolc boolx call
-          call-method cast ceil cfunc charlen char_off class_constructor clear
-          cluster cmax cmin cnt communication_failure concat_lines_of cond
-          cond-var condense constructor contains contains_any_not_of
-          contains_any_of copy cos cosh count count_any_not_of count_any_of
-          create cursor data dbmaxlen dbtab deserialize destructor distance
-          empty error_message escape exp extensible find find_any_not_of
-          find_any_of find_end floor frac from_mixed group hashed header idx
-          include index insert ipow itab key lax lines line_exists line_index
-          log log10 loop loop_key match matches me mesh_path namespace nmax
-          nmin node numeric numofchar object parameter primary_key read ref
-          repeat replace rescale resource_failure reverse root round segment
-          sender serialize shift_left shift_right sign simple sin sinh skip
-          sorted space sqrt standard strlen substring substring_after
-          substring_before substring_from substring_to sum switch switch-var
-          system_failure table table_line tan tanh template text to_lower
-          to_mixed to_upper transform translate trunc type value variable write
+          abs acos add_days add_months add_seconds apply asin assign atan
+          attribute bit-set boolc boolx call call-method cast ceil cfunc
+          charlen char_off class_constructor clear cluster cmax cmin cnt
+          coalesce communication_failure concat concat_lines_of cond cond-var
+          condense constructor contains contains_any_not_of contains_any_of
+          conv copy corresponding cos cosh count count_any_not_of count_any_of
+          create currency_conversion current_utctimestamp cursor data
+          days_between dbmaxlen dbtab deserialize destructor distance div
+          division empty error_message escape exact exp extensible filter find
+          find_any_not_of find_any_of find_end floor frac from_mixed group
+          hashed header idx include index insert ipow is_valid itab key lax let
+          lines line_exists line_index log log10 loop loop_key match matches me
+          mesh_path mod namespace new nmax nmin node numeric numofchar object
+          parameter primary_key read reduce ref repeat replace rescale
+          resource_failure reverse root round seconds_between segment sender
+          serialize shift_left shift_right sign simple sin sinh skip sorted
+          space sqrt standard strlen substring substring_after substring_before
+          substring_from substring_to sum switch switch-var system_failure
+          table table_line tan tanh template text to_lower to_mixed to_upper
+          transform translate trunc type unit_conversion value variable write
           xsdbool xsequence xstrlen
         )
       end
@@ -187,8 +191,12 @@ def self.new_keywords
         rule %r/".*/, Comment::Single
         rule %r(^\*.*), Comment::Multiline
         rule %r/\d+/, Num::Integer
+
+        # String templates |...|
+        rule %r/\|/, Str::Interpol, :string_template
+
         rule %r/('|`)/, Str::Single, :single_string
-        rule %r/[\[\]\(\)\{\}\.,:\|]/, Punctuation
+        rule %r/[\[\]\(\)\{\}\.,:]/, Punctuation
 
         # builtins / new ABAP 7.40 keywords (@DATA(), ...)
         rule %r/(->|=>)?([A-Za-z][A-Za-z0-9_\-]*)(\()/ do |m|
@@ -206,6 +214,19 @@ def self.new_keywords
           token Punctuation, m[3]
         end
 
+        # hyphenated keywords (like NON-UNIQUE)
+        rule %r/[A-Za-z][A-Za-z0-9_]*(-[A-Za-z][A-Za-z0-9_]*)+/ do |m|
+          if self.class.keywords.include? m[0].upcase
+            token Keyword
+          else
+            token Name
+          end
+        end
+
+        # structure component access (variable-component should not be highlighted as keyword)
+        # this rule matches: word-word where the second part is lowercase or starts lowercase
+        rule %r/[A-Za-z][A-Za-z0-9_]*-[a-z][A-Za-z0-9_]*/, Name
+
         # keywords, types and normal text
         rule %r/\w\w*/ do |m|
           if self.class.keywords.include? m[0].upcase
@@ -235,6 +256,12 @@ def self.new_keywords
         rule %r/[^\\'`]+/, Str::Single
       end
 
+      state :string_template do
+        rule %r/\{[^}]*\}/, Str::Interpol  # embedded expressions
+        rule %r/\|/, Str::Interpol, :pop!
+        rule %r/[^|{]+/, Str::Interpol
+      end
+
     end
   end
 end