ext to lang

The ext_to_lang object is a lookup table that maps file extensions to their corresponding programming languages, with 61 entries defined.

The ext_to_lang object is a data structure that contains a list of key-value pairs, mapping file extensions to programming languages. With 61 entries, this object can be used as a lookup table to identify the language of a file based on its extension.

Run example

ext to lang

import path from 'path' var ext_to_lang = { // extension:language 'm': 'cpp', 'c': 'cpp', 'h': 'cpp', 'cpp': 'cpp', 'dtd': 'dtd', 'htm': 'html', 'html': 'html', 'java': 'java', 'js': 'javascript', 'mysql': 'mysql', 'pl': 'perl', 'php': 'php', 'py': 'python', 'rb': 'ruby', 'sql': 'sql', 'xml': 'xml', 'vbs': 'vbscript', 'as':'actionscript', 'abap':'abap', 'a':'ada', 'applescript':'applescript', 'x86':'asm', 'asm':'asm', 'm68k':'m68k', 'pic16':'pic16', 'z80':'z80', 'log':'apache', 'list':'apt_sources', 'asp':'asp', 'aspx':'asp', 'aut':'autoit', 'abnf':'bnf', 'bnf':'bnf', 'sh':'bash', 'bash':'bash', 'bgm':'basic4gl', 'bb':'blitzbasic', 'b':'bf', 'bf':'bf', 'c':'cpp', 'h':'cpp', 'cpp':'cpp', 'cs':'csharp', 'csharp':'csharp', 'dcl':'caddcl', 'lsp':'cadlisp', 'cfdg':'cfdg', 'cil':'cil', 'cob':'cobol', 'cbl':'cobol', 'cobol':'cobol', 'css':'css', 'd':'d', 'pas':'delphi', 'dpr':'delphi', 'patch':'diff', 'diff':'diff', 'batch':'dos', 'dot':'dot', 'eff':'eiffel', 'f77':'fortran', 'f95':'fortran', 'ftn':'fortran', '4gl':'genero', 'fbl':'freebasic', 'mo':'gettext', 'glsl':'glsl', 'gml':'gml', 'plt':'gnuplot', 'groovy':'groovy', 'gs':'haskell', 'hs':'haskell', 'hq9+':'hq9plus', 'htm':'html', 'html':'html', 'ini':'ini', 'ino':'inno', 'myp':'inno', 'i':'intercal', 'io':'io', 'java':'java', 'js':'javascript', 'javascript':'javascript', 'kix':'kixtart', 'tex':'latex', 'lisp':'lisp', 'lsp':'lisp', 'lols':'lolcode', 'lol':'lolcode', 'lsx':'lotusscript', 'lscript':'lscript', 'lua':'lua', 'makefile':'make', 'make':'make', 'mrc':'mirc', 'mxml':'mxml', 'mysql':'mysql', 'nsh':'nsis', 'nsi':'nsis', 'cma':'ocaml', 'p':'pascal', 'pl':'perl', 'php':'php', 'php4':'php', 'php5':'php', 'phps':'php', 'pbk':'pixelbender', 'pl':'plsql', 'pov':'povray', 'ps':'powershell', 'pl':'prolog', 'pvx':'providex', 'py':'python', 'qbasic':'qbasic', 'rb':'ruby', 'ruby':'ruby', 'sas':'sas', 'sas':'scala', 'scm':'scheme', 'sce':'scilab', 'st':'smalltalk', 'sql':'sql', 'tk':'tcl', 'tcl':'tcl', 'tclx':'tcl', 'tbasic':'thinbasic', 'typo3':'typoscript', 'idl':'idl', 'vb':'vbnet', 'v':'verilog', 'vhdl':'vhdl', 'vim':'vim', 'wbt':'winbatch', 'reg':'reg', 'xml':'xml', 'x++':'xpp', 'vbs':'vb', } var lang_to_parser = [ '../Resources/Parsers/abnf/Abnf.g4', '../Resources/Parsers/agc/agc.g4', '../Resources/Parsers/algol60/algol60.g4', '../Resources/Parsers/alpaca/alpaca.g4', '../Resources/Parsers/antlr/antlr3/ANTLRv3.g4', '../Resources/Parsers/antlr/antlr4/ANTLRv4Lexer.g4', '../Resources/Parsers/antlr/antlr4/ANTLRv4LexerPythonTarget.g4', '../Resources/Parsers/antlr/antlr4/ANTLRv4Parser.g4', '../Resources/Parsers/antlr/antlr4/LexBasic.g4', '../Resources/Parsers/antlr/antlr4/examples/CPP14.g4', '../Resources/Parsers/antlr/antlr4/examples/Hello.g4', '../Resources/Parsers/antlr/antlr4/examples/Issue1567.g4', '../Resources/Parsers/antlr/antlr4/examples/issue1165.g4', '../Resources/Parsers/antlr/antlr4/examples/issue1165_2.g4', '../Resources/Parsers/antlr/antlr4/examples/issue1165_3.g4', '../Resources/Parsers/antlr/antlr4/examples/issue1165_4.g4', '../Resources/Parsers/antlr/antlr4/examples/three.g4', '../Resources/Parsers/antlr/antlr4/examples/twocomments.g4', '../Resources/Parsers/apex/apex.g4', '../Resources/Parsers/arithmetic/arithmetic.g4', '../Resources/Parsers/asm/asm6502/asm6502.g4', '../Resources/Parsers/asm/asm8080/asm8080.g4', '../Resources/Parsers/asm/asm8086/asm8086.g4', '../Resources/Parsers/asm/asmMASM/asmMASM.g4', '../Resources/Parsers/asm/asmZ80/asmZ80.g4', '../Resources/Parsers/asm/masm/MASM.g4', '../Resources/Parsers/asn/asn/ASN.g4', '../Resources/Parsers/asn/asn_3gpp/ASN_3gpp.g4', '../Resources/Parsers/aspectj/AspectJLexer.g4', '../Resources/Parsers/aspectj/AspectJParser.g4', '../Resources/Parsers/atl/ATL.g4', '../Resources/Parsers/b/b.g4', '../Resources/Parsers/basic/jvmBasic.g4', '../Resources/Parsers/bnf/bnf.g4', '../Resources/Parsers/brainfuck/brainfuck.g4', '../Resources/Parsers/c/C.g4', '../Resources/Parsers/calculator/calculator.g4', '../Resources/Parsers/capnproto/CapnProto.g4', '../Resources/Parsers/clf/clf.g4', '../Resources/Parsers/clif/CLIF.g4', '../Resources/Parsers/clojure/Clojure.g4', '../Resources/Parsers/clu/clu.g4', '../Resources/Parsers/cmake/CMake.g4', '../Resources/Parsers/cobol85/Cobol85.g4', '../Resources/Parsers/cobol85/Cobol85Preprocessor.g4', '../Resources/Parsers/cookie/cookie.g4', '../Resources/Parsers/cool/COOL.g4', '../Resources/Parsers/cpp/CPP14.g4', '../Resources/Parsers/cql3/CqlLexer.g4', '../Resources/Parsers/cql3/CqlParser.g4', '../Resources/Parsers/creole/creole.g4', '../Resources/Parsers/csharp/CSharpLexer.g4', '../Resources/Parsers/csharp/CSharpParser.g4', '../Resources/Parsers/csharp/CSharpPreprocessorParser.g4', '../Resources/Parsers/csharp/CSharpSharwell/CSharpLexer.g4', '../Resources/Parsers/csharp/CSharpSharwell/CSharpPreprocessorParser.g4', '../Resources/Parsers/css3/css3.g4', '../Resources/Parsers/csv/CSV.g4', '../Resources/Parsers/cto/CtoLexer.g4', '../Resources/Parsers/cto/CtoParser.g4', '../Resources/Parsers/dart2/Dart2.g4', '../Resources/Parsers/databank/databank.g4', '../Resources/Parsers/dcm/DCM_2_0_grammar.g4', '../Resources/Parsers/dice/DiceNotation.g4', '../Resources/Parsers/dice/DiceNotationLexer.g4', '../Resources/Parsers/dot/DOT.g4', '../Resources/Parsers/edif300/EDIF300.g4', '../Resources/Parsers/erlang/Erlang.g4', '../Resources/Parsers/fasta/fasta.g4', '../Resources/Parsers/fen/fen.g4', '../Resources/Parsers/flatbuffers/FlatBuffers.g4', '../Resources/Parsers/fol/fol.g4', '../Resources/Parsers/fortran77/Fortran77Lexer.g4', '../Resources/Parsers/fortran77/Fortran77Parser.g4', '../Resources/Parsers/fusion-tables/FusionTablesSql.g4', '../Resources/Parsers/gff3/gff3.g4', '../Resources/Parsers/gml/gml.g4', '../Resources/Parsers/golang/GoLexer.g4', '../Resources/Parsers/golang/GoParser.g4', '../Resources/Parsers/graphql/GraphQL.g4', '../Resources/Parsers/graphstream-dgs/DGSLexer.g4', '../Resources/Parsers/graphstream-dgs/DGSParser.g4', '../Resources/Parsers/gtin/gtin.g4', '../Resources/Parsers/guido/guido.g4', '../Resources/Parsers/html/HTMLLexer.g4', '../Resources/Parsers/html/HTMLParser.g4', '../Resources/Parsers/http/http.g4', '../Resources/Parsers/hypertalk/HyperTalk.g4', '../Resources/Parsers/icalendar/ICalendar.g4', '../Resources/Parsers/icon/icon.g4', '../Resources/Parsers/idl/IDL.g4', '../Resources/Parsers/inf/inf.g4', '../Resources/Parsers/informix/informix.g4', '../Resources/Parsers/iri/IRI.g4', '../Resources/Parsers/istc/istc.g4', '../Resources/Parsers/java/java/JavaLexer.g4', '../Resources/Parsers/java/java/JavaParser.g4', '../Resources/Parsers/java/java8/Java8Lexer.g4', '../Resources/Parsers/java/java8/Java8Parser.g4', '../Resources/Parsers/java/java9/Java9.g4', '../Resources/Parsers/javadoc/JavadocLexer.g4', '../Resources/Parsers/javadoc/JavadocParser.g4', '../Resources/Parsers/javascript/ecmascript/CSharp/ECMAScript.g4', '../Resources/Parsers/javascript/ecmascript/CSharpSharwell/ECMAScript.g4', '../Resources/Parsers/javascript/ecmascript/ECMAScript.g4', '../Resources/Parsers/javascript/ecmascript/Go/ECMAScript.g4', '../Resources/Parsers/javascript/ecmascript/JavaScript/ECMAScript.g4', '../Resources/Parsers/javascript/ecmascript/Python/ECMAScript.g4', '../Resources/Parsers/javascript/javascript/JavaScriptLexer.g4', '../Resources/Parsers/javascript/javascript/JavaScriptParser.g4', '../Resources/Parsers/jpa/JPA.g4', '../Resources/Parsers/json/JSON.g4', '../Resources/Parsers/jsonquery/JsonQuery.g4', '../Resources/Parsers/kirikiri-tjs/TJSLexer.g4', '../Resources/Parsers/kirikiri-tjs/TJSParser.g4', '../Resources/Parsers/kotlin/kotlin/KotlinLexer.g4', '../Resources/Parsers/kotlin/kotlin/KotlinParser.g4', '../Resources/Parsers/kotlin/kotlin/UnicodeClasses.g4', '../Resources/Parsers/kotlin/kotlin-formal/KotlinLexer.g4', '../Resources/Parsers/kotlin/kotlin-formal/KotlinParser.g4', '../Resources/Parsers/kotlin/kotlin-formal/UnicodeClasses.g4', '../Resources/Parsers/kuka/krl.g4', '../Resources/Parsers/lambda/lambda.g4', '../Resources/Parsers/lcc/lcc.g4', '../Resources/Parsers/less/LessLexer.g4', '../Resources/Parsers/less/LessParser.g4', '../Resources/Parsers/logo/logo/logo.g4', '../Resources/Parsers/logo/ucb-logo/UCBLogo.g4', '../Resources/Parsers/lolcode/lolcode.g4', '../Resources/Parsers/lpc/LPC.g4', '../Resources/Parsers/lua/Lua.g4', '../Resources/Parsers/matlab/matlab.g4', '../Resources/Parsers/mdx/mdx.g4', '../Resources/Parsers/memcached_protocol/memcached_protocol.g4', '../Resources/Parsers/metric/metric.g4', '../Resources/Parsers/modelica/modelica.g4', '../Resources/Parsers/modula2pim4/m2pim4.g4', '../Resources/Parsers/molecule/molecule.g4', '../Resources/Parsers/moo/moo.g4', '../Resources/Parsers/morsecode/morsecode.g4', '../Resources/Parsers/mps/mps.g4', '../Resources/Parsers/muddb/muddb.g4', '../Resources/Parsers/mumath/mumath.g4', '../Resources/Parsers/mumps/mumps.g4', '../Resources/Parsers/muparser/MuParser.g4', '../Resources/Parsers/objc/ObjectiveCParser.g4', '../Resources/Parsers/objc/one-step-processing/ObjectiveCLexer.g4', '../Resources/Parsers/objc/one-step-processing/ObjectiveCPreprocessorParser.g4', '../Resources/Parsers/objc/two-step-processing/ObjectiveCLexer.g4', '../Resources/Parsers/objc/two-step-processing/ObjectiveCPreprocessorLexer.g4', '../Resources/Parsers/objc/two-step-processing/ObjectiveCPreprocessorParser.g4', '../Resources/Parsers/oncrpc/oncrpcv2.g4', '../Resources/Parsers/oncrpc/xdr.g4', '../Resources/Parsers/p/p.g4', '../Resources/Parsers/pascal/pascal.g4', '../Resources/Parsers/pcre/PCRE.g4', '../Resources/Parsers/pddl/Pddl.g4', '../Resources/Parsers/pdn/pdn.g4', '../Resources/Parsers/pdp7/pdp7.g4', '../Resources/Parsers/peoplecode/PeopleCode.g4', '../Resources/Parsers/pgn/PGN.g4', '../Resources/Parsers/php/PhpLexer.g4', '../Resources/Parsers/php/PhpParser.g4', '../Resources/Parsers/pike/pike.g4', '../Resources/Parsers/pl0/pl0.g4', '../Resources/Parsers/ply/ply.g4', '../Resources/Parsers/postalcode/postalcode.g4', '../Resources/Parsers/powerbuilder/PowerBuilderLexer.g4', '../Resources/Parsers/powerbuilder/PowerBuilderParser.g4', '../Resources/Parsers/prolog/prolog.g4', '../Resources/Parsers/propcalc/propcalc.g4', '../Resources/Parsers/properties/properties.g4', '../Resources/Parsers/protobuf3/Protobuf3.g4', '../Resources/Parsers/prov-n/PROV_N.g4', '../Resources/Parsers/python/python/PythonLexer.g4', '../Resources/Parsers/python/python/PythonParser.g4', '../Resources/Parsers/python/python2/Python2.g4', '../Resources/Parsers/python/python2-js/Python2.g4', '../Resources/Parsers/python/python3/Python3.g4', '../Resources/Parsers/python/python3-cs/Python3.g4', '../Resources/Parsers/python/python3-js/Python3.g4', '../Resources/Parsers/python/python3-py/Python3.g4', '../Resources/Parsers/python/python3-ts/Python3.g4', '../Resources/Parsers/python/python3_without_actions/Main/Python3.g4', '../Resources/Parsers/python/python3alt/AltPython3.g4', '../Resources/Parsers/quakemap/quakemap.g4', '../Resources/Parsers/r/R.g4', '../Resources/Parsers/r/RFilter.g4', '../Resources/Parsers/rcs/RCS.g4', '../Resources/Parsers/redcode/redcode.g4', '../Resources/Parsers/rego/RegoLexer.g4', '../Resources/Parsers/rego/RegoParser.g4', '../Resources/Parsers/restructuredtext/ReStructuredText.g4', '../Resources/Parsers/rexx/RexxLexer.g4', '../Resources/Parsers/rexx/RexxParser.g4', '../Resources/Parsers/rfc822/rfc822-datetime/datetime.g4', '../Resources/Parsers/rfc822/rfc822-emailaddress/emailaddress.g4', '../Resources/Parsers/robotwars/robotwar.g4', '../Resources/Parsers/romannumerals/romannumerals.g4', '../Resources/Parsers/rpn/rpn.g4', '../Resources/Parsers/ruby/Corundum.g4', '../Resources/Parsers/scala/Scala.g4', '../Resources/Parsers/scotty/scotty.g4', '../Resources/Parsers/scss/ScssLexer.g4', '../Resources/Parsers/scss/ScssParser.g4', '../Resources/Parsers/sexpression/sexpression.g4', '../Resources/Parsers/sgf/sgf.g4', '../Resources/Parsers/sharc/SHARCLexer.g4', '../Resources/Parsers/sharc/SHARCParser.g4', '../Resources/Parsers/sickbay/sickbay.g4', '../Resources/Parsers/smalltalk/Smalltalk.g4', '../Resources/Parsers/smiles/smiles.g4', '../Resources/Parsers/smtlibv2/SMTLIBv2.g4', '../Resources/Parsers/snobol/snobol.g4', '../Resources/Parsers/solidity/Solidity.g4', '../Resources/Parsers/sparql/Sparql.g4', '../Resources/Parsers/sql/mysql/Positive-Technologies/MySqlLexer.g4', '../Resources/Parsers/sql/mysql/Positive-Technologies/MySqlParser.g4', '../Resources/Parsers/sql/plsql/PlSqlLexer.g4', '../Resources/Parsers/sql/plsql/PlSqlParser.g4', '../Resources/Parsers/sql/sqlite/SQLite.g4', '../Resources/Parsers/sql/tsql/TSqlLexer.g4', '../Resources/Parsers/sql/tsql/TSqlParser.g4', '../Resources/Parsers/stacktrace/StackTrace.g4', '../Resources/Parsers/stellaris/stellaris.g4', '../Resources/Parsers/stringtemplate/LexBasic.g4', '../Resources/Parsers/stringtemplate/LexUnicode.g4', '../Resources/Parsers/stringtemplate/STGLexer.g4', '../Resources/Parsers/stringtemplate/STGParser.g4', '../Resources/Parsers/stringtemplate/STLexer.g4', '../Resources/Parsers/stringtemplate/STParser.g4', '../Resources/Parsers/suokif/SUOKIF.g4', '../Resources/Parsers/swift/swift2/Swift2.g4', '../Resources/Parsers/swift/swift3/Swift3.g4', '../Resources/Parsers/swift-fin/src/main/antlr4/SwiftFinLexer.g4', '../Resources/Parsers/swift-fin/src/main/antlr4/SwiftFinParser.g4', '../Resources/Parsers/telephone/telephone.g4', '../Resources/Parsers/thrift/Thrift.g4', '../Resources/Parsers/tiny/tiny.g4', '../Resources/Parsers/tinybasic/tinybasic.g4', '../Resources/Parsers/tinyc/tinyc.g4', '../Resources/Parsers/tinymud/tinymud.g4', '../Resources/Parsers/tnsnames/tnsnamesLexer.g4', '../Resources/Parsers/tnsnames/tnsnamesParser.g4', '../Resources/Parsers/tnt/tnt.g4', '../Resources/Parsers/toml/toml.g4', '../Resources/Parsers/tsv/tsv.g4', '../Resources/Parsers/turtle/TURTLE.g4', '../Resources/Parsers/turtle-doc/turtle.g4', '../Resources/Parsers/typescript/TypeScriptLexer.g4', '../Resources/Parsers/typescript/TypeScriptParser.g4', '../Resources/Parsers/unicode/graphemes/Graphemes.g4', '../Resources/Parsers/unicode/unicode16/classify.g4', '../Resources/Parsers/upnp/Upnp.g4', '../Resources/Parsers/url/url.g4', '../Resources/Parsers/useragent/useragent.g4', '../Resources/Parsers/v/V.g4', '../Resources/Parsers/vb6/VisualBasic6.g4', '../Resources/Parsers/vba/vba.g4', '../Resources/Parsers/verilog/system_verilog/SysVerilogHDL.g4', '../Resources/Parsers/verilog/verilog/Verilog2001.g4', '../Resources/Parsers/vhdl/vhdl.g4', '../Resources/Parsers/wat/WatLexer.g4', '../Resources/Parsers/wat/WatParser.g4', '../Resources/Parsers/wavefront/WavefrontOBJ.g4', '../Resources/Parsers/webidl/WebIDL.g4', '../Resources/Parsers/wkt/wkt.g4', '../Resources/Parsers/xml/XMLLexer.g4', '../Resources/Parsers/xml/XMLParser.g4', '../Resources/Parsers/xpath/xpath.g4', '../Resources/Parsers/xsd-regex/regexLexer.g4', '../Resources/Parsers/xsd-regex/regexParser.g4', '../Resources/Parsers/z/ZLexer.g4', '../Resources/Parsers/z/ZOperatorParser.g4', '../Resources/Parsers/z/ZParser.g4' ] function extToLang(filename) { var result = ext_to_lang[filename] || filename.replace(/^\./, '') || ext_to_lang[path.extname(filename).replace(/^\./, '')] if(!result) throw new Error(`Unknown filetype ${filename}`) return result } export default extToLang

What the code could have been:

// Mapping of file extensions to languages
const extToLang = {
  '.m': 'c',
  '.c': 'c',
  '.h': 'c',
  '.cpp': 'c',
  '.dtd': 'xml',
  '.htm': 'html',
  '.html': 'html',
  '.java': 'java',
  '.js': 'javascript',
  '.mysql':'mysql',
  '.pl': 'perl',
  '.php': 'php',
  '.py': 'python',
  '.rb': 'ruby',
  '.sql':'sql',
  '.xml': 'xml',
  '.vbs': 'vbscript',
  '.as': 'actionscript',
  '.abap': 'abap',
  '.a': 'ada',
  '.applescript': 'applescript',
  '.x86': 'asm',
  '.asm': 'asm',
  '.m68k':'m68k',
  '.pic16': 'pic16',
  '.z80': 'z80',
  '.log': 'apache',
  '.list': 'apt_sources',
  '.asp': 'asp',
  '.aspx': 'asp',
  '.aut': 'autoit',
  '.abnf': 'bnf',
  '.bnf': 'bnf',
  '.sh': 'bash',
  '.bash': 'bash',
  '.bgm': 'basic4gl',
  '.bb': 'blitzbasic',
  '.b': 'bf',
  '.bf': 'bf',
  '.c': 'c',
  '.h': 'c',
  '.cpp': 'c',
  '.cs': 'csharp',
  '.csharp': 'csharp',
  '.dcl': 'caddcl',
  '.lsp': 'cadlisp',
  '.cfdg': 'cfdg',
  '.cil': 'cil',
  '.cob': 'cobol',
  '.cbl': 'cobol',
  '.cobol': 'cobol',
  '.css': 'css',
  '.d': 'd',
  '.pas': 'delphi',
  '.dpr': 'delphi',
  '.patch': 'diff',
  '.diff': 'diff',
  '.batch': 'dos',
  '.dot': 'dot',
  '.eff': 'eiffel',
  '.f77': 'fortran',
  '.f95': 'fortran',
  '.ftn': 'fortran',
  '.4gl': 'genero',
  '.fbl': 'freebasic',
  '.mo': 'gettext',
  '.glsl': 'glsl',
  '.gml': 'gml',
  '.plt': 'gnuplot',
  '.groovy': 'groovy',
  '.gs': 'haskell',
  '.hs': 'haskell',
  '.hq9+': 'hq9plus',
  '.htm': 'html',
  '.html': 'html',
  '.ini': 'ini',
  '.ino': 'inno',
  '.myp': 'inno',
  '.i': 'intercal',
  '.io': 'io',
  '.java': 'java',
  '.js': 'javascript',
  '.kix': 'kixtart',
  '.tex': 'latex',
  '.lisp': 'lisp',
  '.lsp': 'lisp',
  '.lols': 'lolcode',
  '.lol': 'lolcode',
  '.lsx': 'lotusscript',
  '.lscript': 'lscript',
  '.lua': 'lua',
  '.makefile':'make',
  '.make':'make',
  '.mrc':'mirc',
  '.mxml':'mxml',
  '.mysql':'mysql',
  '.nsh': 'nsis',
  '.nsi': 'nsis',
  '.cma': 'ocaml',
  '.p': 'pascal',
  '.pl': 'perl',
  '.php': 'php',
  '.php4': 'php',
  '.php5': 'php',
  '.phps': 'php',
  '.pbk': 'pixelbender',
  '.pl': 'plsql',
  '.pov': 'povray',
  '.ps': 'powershell',
  '.pl': 'prolog',
  '.pvx': 'providex',
  '.py': 'python',
  '.qbasic': 'qbasic',
  '.rb': 'ruby',
  '.ruby': 'ruby',
  '.sas':'sas',
  '.sas':'scala',
  '.scm':'scheme',
  '.sce':'scilab',
  '.st':'smalltalk',
  '.sql':'sql',
  '.tk': 'tcl',
  '.tcl': 'tcl',
  '.tclx': 'tcl',
  '.tbasic': 'thinbasic',
  '.typo3': 'typoscript',
  '.idl': 'idl',
  '.vb': 'vbnet',
  '.v':'verilog',
  '.vhdl': 'vhdl',
  '.vim': 'vim',
  '.wbt': 'winbatch',
  '.reg':'reg',
  '.xml': 'xml',
  '.x++': 'xpp',
  '.vbs': 'vb',
}

// Mapping of languages to parser files
const langToParser = [
  '../Resources/Parsers/abnf/Abnf.g4',
  //... (omitted for brevity)
]

// Function to get the language from a file extension
function extToLang(filename) {
  const ext = path.extname(filename).replace(/^\./, '')
  const result = extToLang[ext]
  if (!result) {
    throw new Error(`Unknown filetype ${filename}`)
  }
  return result
}

// Get the parser file based on the language
function getParserFile(language) {
  const parserFiles = langToParser.filter((parser) => {
    const lang = path.basename(parser, '.g4')
    return lang === language
  })
  if (parserFiles.length > 0) {
    return parserFiles[0]
  }
  throw new Error(`Unknown language ${language}`)
}

// Export the functions
export { extToLang, getParserFile }

Code Breakdown

This code defines an object ext_to_lang that maps file extensions to their corresponding programming languages.

Key Points

Example Entries

Purpose

The purpose of this code is likely to provide a lookup table for identifying the language of a file based on its extension. This can be useful in various scenarios, such as in an Integrated Development Environment (IDE), a version control system, or a file manager.