class Rouge::Lexers::Racket

def self.analyze_text(text)
  text = text.strip
  return 1 if text.start_with? '#lang racket'
  return 0.6 if text =~ %r(\A#lang [a-z/-]+$)i
end

def self.builtins
  @builtins ||= Set.new %w(
    * + - / < <= = > >=
    abort-current-continuation abs absolute-path? acos add1
    alarm-evt always-evt andmap angle append apply
    arithmetic-shift arity-at-least arity-at-least-value
    arity-at-least? asin assoc assq assv atan banner bitwise-and
    bitwise-bit-field bitwise-bit-set? bitwise-ior bitwise-not
    bitwise-xor boolean? bound-identifier=? box box-cas!
    box-immutable box? break-enabled break-thread build-path
    build-path/convention-type byte-pregexp byte-pregexp?
    byte-ready? byte-regexp byte-regexp? byte? bytes
    bytes->immutable-bytes bytes->list bytes->path
    bytes->path-element bytes->string/latin-1
    bytes->string/locale bytes->string/utf-8 bytes-append
    bytes-close-converter bytes-convert bytes-convert-end
    bytes-converter? bytes-copy bytes-copy!
    bytes-environment-variable-name? bytes-fill! bytes-length
    bytes-open-converter bytes-ref bytes-set! bytes-utf-8-index
    bytes-utf-8-length bytes-utf-8-ref bytes<? bytes=? bytes>?
    bytes? caaaar caaadr caaar caadar caaddr caadr caar cadaar
    cadadr cadar caddar cadddr caddr cadr call-in-nested-thread
    call-with-break-parameterization
    call-with-composable-continuation
    call-with-continuation-barrier call-with-continuation-prompt
    call-with-current-continuation
    call-with-default-reading-parameterization
    call-with-escape-continuation call-with-exception-handler
    call-with-immediate-continuation-mark call-with-input-file
    call-with-output-file call-with-parameterization
    call-with-semaphore call-with-semaphore/enable-break
    call-with-values call/cc call/ec car cdaaar cdaadr cdaar
    cdadar cdaddr cdadr cdar cddaar cddadr cddar cdddar cddddr
    cdddr cddr cdr ceiling channel-get channel-put
    channel-put-evt channel-put-evt? channel-try-get channel?
    chaperone-box chaperone-continuation-mark-key chaperone-evt
    chaperone-hash chaperone-of? chaperone-procedure
    chaperone-prompt-tag chaperone-struct chaperone-struct-type
    chaperone-vector chaperone? char->integer char-alphabetic?
    char-blank? char-ci<=? char-ci<? char-ci=? char-ci>=?
    char-ci>? char-downcase char-foldcase char-general-category
    char-graphic? char-iso-control? char-lower-case?
    char-numeric? char-punctuation? char-ready? char-symbolic?
    char-title-case? char-titlecase char-upcase char-upper-case?
    char-utf-8-length char-whitespace? char<=? char<? char=?
    char>=? char>? char? check-duplicate-identifier
    checked-procedure-check-and-extract choice-evt cleanse-path
    close-input-port close-output-port collect-garbage
    collection-file-path collection-path compile
    compile-allow-set!-undefined
    compile-context-preservation-enabled
    compile-enforce-module-constants compile-syntax
    compiled-expression? compiled-module-expression?
    complete-path? complex? cons continuation-mark-key?
    continuation-mark-set->context continuation-mark-set->list
    continuation-mark-set->list* continuation-mark-set-first
    continuation-mark-set? continuation-marks
    continuation-prompt-available? continuation-prompt-tag?
    continuation? copy-file cos current-break-parameterization
    current-code-inspector current-command-line-arguments
    current-compile current-compiled-file-roots
    current-continuation-marks current-custodian
    current-directory current-directory-for-user current-drive
    current-environment-variables current-error-port
    current-eval current-evt-pseudo-random-generator
    current-gc-milliseconds current-get-interaction-input-port
    current-inexact-milliseconds current-input-port
    current-inspector current-library-collection-paths
    current-load current-load-extension
    current-load-relative-directory current-load/use-compiled
    current-locale current-memory-use current-milliseconds
    current-module-declare-name current-module-declare-source
    current-module-name-resolver current-module-path-for-load
    current-namespace current-output-port
    current-parameterization
    current-preserved-thread-cell-values current-print
    current-process-milliseconds current-prompt-read
    current-pseudo-random-generator current-read-interaction
    current-reader-guard current-readtable current-seconds
    current-security-guard current-subprocess-custodian-mode
    current-thread current-thread-group
    current-thread-initial-stack-size
    current-write-relative-directory custodian-box-value
    custodian-box? custodian-limit-memory custodian-managed-list
    custodian-memory-accounting-available?
    custodian-require-memory custodian-shutdown-all custodian?
    custom-print-quotable-accessor custom-print-quotable?
    custom-write-accessor custom-write? date date*
    date*-nanosecond date*-time-zone-name date*? date-day
    date-dst? date-hour date-minute date-month date-second
    date-time-zone-offset date-week-day date-year date-year-day
    date? datum-intern-literal default-continuation-prompt-tag
    delete-directory delete-file denominator directory-exists?
    directory-list display displayln dump-memory-stats
    dynamic-require dynamic-require-for-syntax dynamic-wind
    environment-variables-copy environment-variables-names
    environment-variables-ref environment-variables-set!
    environment-variables? eof eof-object? ephemeron-value
    ephemeron? eprintf eq-hash-code eq? equal-hash-code
    equal-secondary-hash-code equal? equal?/recur eqv-hash-code
    eqv? error error-display-handler error-escape-handler
    error-print-context-length error-print-source-location
    error-print-width error-value->string-handler eval
    eval-jit-enabled eval-syntax even? evt? exact->inexact
    exact-integer? exact-nonnegative-integer?
    exact-positive-integer? exact? executable-yield-handler exit
    exit-handler exn exn-continuation-marks exn-message
    exn:break exn:break-continuation exn:break:hang-up
    exn:break:hang-up? exn:break:terminate exn:break:terminate?
    exn:break? exn:fail exn:fail:contract
    exn:fail:contract:arity exn:fail:contract:arity?
    exn:fail:contract:continuation
    exn:fail:contract:continuation?
    exn:fail:contract:divide-by-zero
    exn:fail:contract:divide-by-zero?
    exn:fail:contract:non-fixnum-result
    exn:fail:contract:non-fixnum-result?
    exn:fail:contract:variable exn:fail:contract:variable-id
    exn:fail:contract:variable? exn:fail:contract?
    exn:fail:filesystem exn:fail:filesystem:errno
    exn:fail:filesystem:errno-errno exn:fail:filesystem:errno?
    exn:fail:filesystem:exists exn:fail:filesystem:exists?
    exn:fail:filesystem:missing-module
    exn:fail:filesystem:missing-module-path
    exn:fail:filesystem:missing-module?
    exn:fail:filesystem:version exn:fail:filesystem:version?
    exn:fail:filesystem? exn:fail:network exn:fail:network:errno
    exn:fail:network:errno-errno exn:fail:network:errno?
    exn:fail:network? exn:fail:out-of-memory
    exn:fail:out-of-memory? exn:fail:read exn:fail:read-srclocs
    exn:fail:read:eof exn:fail:read:eof? exn:fail:read:non-char
    exn:fail:read:non-char? exn:fail:read? exn:fail:syntax
    exn:fail:syntax-exprs exn:fail:syntax:missing-module
    exn:fail:syntax:missing-module-path
    exn:fail:syntax:missing-module? exn:fail:syntax:unbound
    exn:fail:syntax:unbound? exn:fail:syntax?
    exn:fail:unsupported exn:fail:unsupported? exn:fail:user
    exn:fail:user? exn:fail? exn:missing-module-accessor
    exn:missing-module? exn:srclocs-accessor exn:srclocs? exn?
    exp expand expand-once expand-syntax expand-syntax-once
    expand-syntax-to-top-form expand-to-top-form
    expand-user-path explode-path expt file-exists?
    file-or-directory-identity file-or-directory-modify-seconds
    file-or-directory-permissions file-position file-position*
    file-size file-stream-buffer-mode file-stream-port?
    file-truncate filesystem-change-evt
    filesystem-change-evt-cancel filesystem-change-evt?
    filesystem-root-list find-executable-path
    find-library-collection-paths find-system-path fixnum?
    floating-point-bytes->real flonum? floor flush-output
    for-each format fprintf free-identifier=? gcd
    generate-temporaries gensym get-output-bytes
    get-output-string getenv global-port-print-handler guard-evt
    handle-evt handle-evt? hash hash-equal? hash-eqv?
    hash-has-key? hash-placeholder? hash-ref! hasheq hasheqv
    identifier-binding identifier-binding-symbol
    identifier-label-binding identifier-prune-lexical-context
    identifier-prune-to-source-module
    identifier-remove-from-definition-context
    identifier-template-binding identifier-transformer-binding
    identifier? imag-part immutable? impersonate-box
    impersonate-continuation-mark-key impersonate-hash
    impersonate-procedure impersonate-prompt-tag
    impersonate-struct impersonate-vector impersonator-ephemeron
    impersonator-of? impersonator-prop:application-mark
    impersonator-property-accessor-procedure?
    impersonator-property? impersonator? inexact->exact
    inexact-real? inexact? input-port? inspector? integer->char
    integer->integer-bytes integer-bytes->integer integer-length
    integer-sqrt integer-sqrt/remainder integer?
    internal-definition-context-seal
    internal-definition-context? keyword->string keyword<?
    keyword? kill-thread lcm length liberal-define-context?
    link-exists? list list* list->bytes list->string
    list->vector list-ref list-tail list? load load-extension
    load-on-demand-enabled load-relative load-relative-extension
    load/cd load/use-compiled local-expand
    local-expand/capture-lifts local-transformer-expand
    local-transformer-expand/capture-lifts
    locale-string-encoding log log-max-level magnitude
    make-arity-at-least make-bytes make-channel
    make-continuation-mark-key make-continuation-prompt-tag
    make-custodian make-custodian-box make-date make-date*
    make-derived-parameter make-directory
    make-environment-variables make-ephemeron make-exn
    make-exn:break make-exn:break:hang-up
    make-exn:break:terminate make-exn:fail
    make-exn:fail:contract make-exn:fail:contract:arity
    make-exn:fail:contract:continuation
    make-exn:fail:contract:divide-by-zero
    make-exn:fail:contract:non-fixnum-result
    make-exn:fail:contract:variable make-exn:fail:filesystem
    make-exn:fail:filesystem:errno
    make-exn:fail:filesystem:exists
    make-exn:fail:filesystem:missing-module
    make-exn:fail:filesystem:version make-exn:fail:network
    make-exn:fail:network:errno make-exn:fail:out-of-memory
    make-exn:fail:read make-exn:fail:read:eof
    make-exn:fail:read:non-char make-exn:fail:syntax
    make-exn:fail:syntax:missing-module
    make-exn:fail:syntax:unbound make-exn:fail:unsupported
    make-exn:fail:user make-file-or-directory-link
    make-hash-placeholder make-hasheq-placeholder make-hasheqv
    make-hasheqv-placeholder make-immutable-hasheqv
    make-impersonator-property make-input-port make-inspector
    make-known-char-range-list make-output-port make-parameter
    make-phantom-bytes make-pipe make-placeholder make-polar
    make-prefab-struct make-pseudo-random-generator
    make-reader-graph make-readtable make-rectangular
    make-rename-transformer make-resolved-module-path
    make-security-guard make-semaphore make-set!-transformer
    make-shared-bytes make-sibling-inspector
    make-special-comment make-srcloc make-string
    make-struct-field-accessor make-struct-field-mutator
    make-struct-type make-struct-type-property
    make-syntax-delta-introducer make-syntax-introducer
    make-thread-cell make-thread-group make-vector make-weak-box
    make-weak-hasheqv make-will-executor map max mcar mcdr mcons
    member memq memv min module->exports module->imports
    module->language-info module->namespace
    module-compiled-cross-phase-persistent?
    module-compiled-exports module-compiled-imports
    module-compiled-language-info module-compiled-name
    module-compiled-submodules module-declared?
    module-path-index-join module-path-index-resolve
    module-path-index-split module-path-index-submodule
    module-path-index? module-path? module-predefined?
    module-provide-protected? modulo mpair? nack-guard-evt
    namespace-attach-module namespace-attach-module-declaration
    namespace-base-phase namespace-mapped-symbols
    namespace-module-identifier namespace-module-registry
    namespace-require namespace-require/constant
    namespace-require/copy namespace-require/expansion-time
    namespace-set-variable-value! namespace-symbol->identifier
    namespace-syntax-introduce namespace-undefine-variable!
    namespace-unprotect-module namespace-variable-value
    namespace? negative? never-evt newline normal-case-path not
    null null? number->string number? numerator object-name odd?
    open-input-bytes open-input-file open-input-output-file
    open-input-string open-output-bytes open-output-file
    open-output-string ormap output-port? pair?
    parameter-procedure=? parameter? parameterization?
    path->bytes path->complete-path path->directory-path
    path->string path-add-suffix path-convention-type
    path-element->bytes path-element->string
    path-for-some-system? path-list-string->path-list
    path-replace-suffix path-string? path? peek-byte
    peek-byte-or-special peek-bytes peek-bytes!
    peek-bytes-avail! peek-bytes-avail!*
    peek-bytes-avail!/enable-break peek-char
    peek-char-or-special peek-string peek-string! phantom-bytes?
    pipe-content-length placeholder-get placeholder-set!
    placeholder? poll-guard-evt port-closed-evt port-closed?
    port-commit-peeked port-count-lines!
    port-count-lines-enabled port-counts-lines?
    port-display-handler port-file-identity port-file-unlock
    port-next-location port-print-handler port-progress-evt
    port-provides-progress-evts? port-read-handler
    port-try-file-lock? port-write-handler port-writes-atomic?
    port-writes-special? port? positive? prefab-key->struct-type
    prefab-key? prefab-struct-key pregexp pregexp?
    primitive-closure? primitive-result-arity primitive? print
    print-as-expression print-boolean-long-form print-box
    print-graph print-hash-table print-mpair-curly-braces
    print-pair-curly-braces print-reader-abbreviations
    print-struct print-syntax-width print-unreadable
    print-vector-length printf procedure->method procedure-arity
    procedure-arity-includes? procedure-arity?
    procedure-closure-contents-eq? procedure-extract-target
    procedure-reduce-arity procedure-rename
    procedure-struct-type? procedure? progress-evt?
    prop:arity-string prop:checked-procedure
    prop:custom-print-quotable prop:custom-write prop:equal+hash
    prop:evt prop:exn:missing-module prop:exn:srclocs
    prop:impersonator-of prop:input-port
    prop:liberal-define-context prop:output-port prop:procedure
    prop:rename-transformer prop:set!-transformer
    pseudo-random-generator->vector
    pseudo-random-generator-vector? pseudo-random-generator?
    putenv quotient quotient/remainder raise
    raise-argument-error raise-arguments-error raise-arity-error
    raise-mismatch-error raise-range-error raise-result-error
    raise-syntax-error raise-type-error raise-user-error random
    random-seed rational? rationalize read read-accept-bar-quote
    read-accept-box read-accept-compiled read-accept-dot
    read-accept-graph read-accept-infix-dot read-accept-lang
    read-accept-quasiquote read-accept-reader read-byte
    read-byte-or-special read-bytes read-bytes!
    read-bytes-avail! read-bytes-avail!*
    read-bytes-avail!/enable-break read-bytes-line
    read-case-sensitive read-char read-char-or-special
    read-curly-brace-as-paren read-decimal-as-inexact
    read-eval-print-loop read-language read-line
    read-on-demand-source read-square-bracket-as-paren
    read-string read-string! read-syntax read-syntax/recursive
    read/recursive readtable-mapping readtable?
    real->double-flonum real->floating-point-bytes
    real->single-flonum real-part real? regexp regexp-match
    regexp-match-peek regexp-match-peek-immediate
    regexp-match-peek-positions
    regexp-match-peek-positions-immediate
    regexp-match-peek-positions-immediate/end
    regexp-match-peek-positions/end regexp-match-positions
    regexp-match-positions/end regexp-match/end regexp-match?
    regexp-max-lookbehind regexp-replace regexp-replace* regexp?
    relative-path? remainder rename-file-or-directory
    rename-transformer-target rename-transformer? reroot-path
    resolve-path resolved-module-path-name resolved-module-path?
    reverse round seconds->date security-guard?
    semaphore-peek-evt semaphore-peek-evt? semaphore-post
    semaphore-try-wait? semaphore-wait
    semaphore-wait/enable-break semaphore?
    set!-transformer-procedure set!-transformer? set-box!
    set-mcar! set-mcdr! set-phantom-bytes!
    set-port-next-location! shared-bytes shell-execute
    simplify-path sin single-flonum? sleep special-comment-value
    special-comment? split-path sqrt srcloc srcloc->string
    srcloc-column srcloc-line srcloc-position srcloc-source
    srcloc-span srcloc? string string->bytes/latin-1
    string->bytes/locale string->bytes/utf-8
    string->immutable-string string->keyword string->list
    string->number string->path string->path-element
    string->symbol string->uninterned-symbol
    string->unreadable-symbol string-append string-ci<=?
    string-ci<? string-ci=? string-ci>=? string-ci>? string-copy
    string-copy! string-downcase
    string-environment-variable-name? string-fill!
    string-foldcase string-length string-locale-ci<?
    string-locale-ci=? string-locale-ci>? string-locale-downcase
    string-locale-upcase string-locale<? string-locale=?
    string-locale>? string-normalize-nfc string-normalize-nfd
    string-normalize-nfkc string-normalize-nfkd string-ref
    string-set! string-titlecase string-upcase
    string-utf-8-length string<=? string<? string=? string>=?
    string>? string? struct->vector struct-accessor-procedure?
    struct-constructor-procedure? struct-info
    struct-mutator-procedure? struct-predicate-procedure?
    struct-type-info struct-type-make-constructor
    struct-type-make-predicate
    struct-type-property-accessor-procedure?
    struct-type-property? struct-type? struct:arity-at-least
    struct:date struct:date* struct:exn struct:exn:break
    struct:exn:break:hang-up struct:exn:break:terminate
    struct:exn:fail struct:exn:fail:contract
    struct:exn:fail:contract:arity
    struct:exn:fail:contract:continuation
    struct:exn:fail:contract:divide-by-zero
    struct:exn:fail:contract:non-fixnum-result
    struct:exn:fail:contract:variable struct:exn:fail:filesystem
    struct:exn:fail:filesystem:errno
    struct:exn:fail:filesystem:exists
    struct:exn:fail:filesystem:missing-module
    struct:exn:fail:filesystem:version struct:exn:fail:network
    struct:exn:fail:network:errno struct:exn:fail:out-of-memory
    struct:exn:fail:read struct:exn:fail:read:eof
    struct:exn:fail:read:non-char struct:exn:fail:syntax
    struct:exn:fail:syntax:missing-module
    struct:exn:fail:syntax:unbound struct:exn:fail:unsupported
    struct:exn:fail:user struct:srcloc struct? sub1 subbytes
    subprocess subprocess-group-enabled subprocess-kill
    subprocess-pid subprocess-status subprocess-wait subprocess?
    substring symbol->string symbol-interned? symbol-unreadable?
    symbol? sync sync/enable-break sync/timeout
    sync/timeout/enable-break syntax->list syntax-arm
    syntax-column syntax-disarm syntax-e syntax-line
    syntax-local-bind-syntaxes syntax-local-certifier
    syntax-local-context syntax-local-expand-expression
    syntax-local-get-shadower syntax-local-introduce
    syntax-local-lift-context syntax-local-lift-expression
    syntax-local-lift-module-end-declaration
    syntax-local-lift-provide syntax-local-lift-require
    syntax-local-lift-values-expression
    syntax-local-make-definition-context
    syntax-local-make-delta-introducer
    syntax-local-module-defined-identifiers
    syntax-local-module-exports
    syntax-local-module-required-identifiers syntax-local-name
    syntax-local-phase-level syntax-local-submodules
    syntax-local-transforming-module-provides?
    syntax-local-value syntax-local-value/immediate
    syntax-original? syntax-position syntax-property
    syntax-property-symbol-keys syntax-protect syntax-rearm
    syntax-recertify syntax-shift-phase-level syntax-source
    syntax-source-module syntax-span syntax-taint
    syntax-tainted? syntax-track-origin
    syntax-transforming-module-expression? syntax-transforming?
    syntax? system-big-endian? system-idle-evt
    system-language+country system-library-subpath
    system-path-convention-type system-type tan terminal-port?
    thread thread-cell-ref thread-cell-set! thread-cell-values?
    thread-cell? thread-dead-evt thread-dead? thread-group?
    thread-resume thread-resume-evt thread-rewind-receive
    thread-running? thread-suspend thread-suspend-evt
    thread-wait thread/suspend-to-kill thread? time-apply
    truncate unbox uncaught-exception-handler
    use-collection-link-paths use-compiled-file-paths
    use-user-specific-search-paths values
    variable-reference->empty-namespace
    variable-reference->module-base-phase
    variable-reference->module-declaration-inspector
    variable-reference->module-path-index
    variable-reference->module-source
    variable-reference->namespace variable-reference->phase
    variable-reference->resolved-module-path
    variable-reference-constant? variable-reference? vector
    vector->immutable-vector vector->list
    vector->pseudo-random-generator
    vector->pseudo-random-generator! vector->values vector-fill!
    vector-immutable vector-length vector-ref vector-set!
    vector-set-performance-stats! vector? version void void?
    weak-box-value weak-box? will-execute will-executor?
    will-register will-try-execute with-input-from-file
    with-output-to-file wrap-evt write write-byte write-bytes
    write-bytes-avail write-bytes-avail* write-bytes-avail-evt
    write-bytes-avail/enable-break write-char write-special
    write-special-avail* write-special-evt write-string zero?
  )
end

def self.keywords
  @keywords ||= Set.new %w(
    ... and begin begin-for-syntax begin0 case case-lambda cond
    datum->syntax-object define define-for-syntax define-logger
    define-struct define-syntax define-syntax-rule
    define-syntaxes define-values define-values-for-syntax delay
    do expand-path fluid-let force hash-table-copy
    hash-table-count hash-table-for-each hash-table-get
    hash-table-iterate-first hash-table-iterate-key
    hash-table-iterate-next hash-table-iterate-value
    hash-table-map hash-table-put! hash-table-remove!
    hash-table? if lambda let let* let*-values let-struct
    let-syntax let-syntaxes let-values let/cc let/ec letrec
    letrec-syntax letrec-syntaxes letrec-syntaxes+values
    letrec-values list-immutable make-hash-table
    make-immutable-hash-table make-namespace module module*
    module-identifier=? module-label-identifier=?
    module-template-identifier=? module-transformer-identifier=?
    namespace-transformer-require or parameterize parameterize*
    parameterize-break promise? prop:method-arity-error provide
    provide-for-label provide-for-syntax quasiquote quasisyntax
    quasisyntax/loc quote quote-syntax quote-syntax/prune
    require require-for-label require-for-syntax
    require-for-template set! set!-values syntax syntax-case
    syntax-case* syntax-id-rules syntax-object->datum
    syntax-rules syntax/loc tcp-abandon-port tcp-accept
    tcp-accept-evt tcp-accept-ready? tcp-accept/enable-break
    tcp-addresses tcp-close tcp-connect tcp-connect/enable-break
    tcp-listen tcp-listener? tcp-port? time transcript-off
    transcript-on udp-addresses udp-bind! udp-bound? udp-close
    udp-connect! udp-connected? udp-multicast-interface
    udp-multicast-join-group! udp-multicast-leave-group!
    udp-multicast-loopback? udp-multicast-set-interface!
    udp-multicast-set-loopback! udp-multicast-set-ttl!
    udp-multicast-ttl udp-open-socket udp-receive! udp-receive!*
    udp-receive!-evt udp-receive!/enable-break
    udp-receive-ready-evt udp-send udp-send* udp-send-evt
    udp-send-ready-evt udp-send-to udp-send-to* udp-send-to-evt
    udp-send-to/enable-break udp-send/enable-break udp? unless
    unquote unquote-splicing unsyntax unsyntax-splicing when
    with-continuation-mark with-handlers with-handlers*
    with-syntax λ)
end