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Adds Go raw string literals per Go spec § String literals: backtick-delimited, no escape processing, may span multiple lines, '\r' chars discarded from the value. gl-read-raw-string! mirrors gl-read-string! but skips escape handling and the \r filter. scan! routes the leading backtick to it; emits "string" type (same as interpreted strings — no need to distinguish at parse/type time). lex 123/123. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
476 lines
14 KiB
Plaintext
476 lines
14 KiB
Plaintext
;; lib/go/lex.sx — Go tokenizer with automatic semicolon insertion.
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;;
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;; Consumes lib/guest/lex.sx character-class predicates.
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;;
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;; Tokens: {:type T :value V :pos P}
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;; Types:
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;; "ident" — identifiers (foo, _bar, mixedCase)
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;; "keyword" — one of the 25 Go keywords
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;; "int" — integer literals (decimal, 0x.. hex, 0b.. binary, 0o.. octal,
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;; legacy 0123 octal; underscores between digits allowed)
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;; "float" — decimal float literals (3.14, .5, 1., 1e10, 1.5e-3, 1E5)
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;; "imag" — imaginary literals (2i, 3.14i, 1e2i)
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;; "string" — interpreted string literals "..." OR raw string literals `...`
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;; "rune" — rune literals 'x' (single char + simple escapes)
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;; "op" — operators & punctuation; :value is the literal text
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;; "semi" — explicit ';' or auto-inserted (Go spec § Semicolons)
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;; "eof" — end-of-input sentinel
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;;
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;; ASI (Go spec § Semicolons): a newline (or EOF, or a block comment
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;; containing a newline) emits a ";semi" if the previous emitted token's
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;; type is ident/int/float/imag/string/rune, or its value is one of
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;; {break, continue, fallthrough, return, ++, --, ), ], }}.
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;;
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;; All scanner locals are gl- prefixed: SX host primitives (peek/emit/etc.)
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;; silently shadow guest-language defines. See feedback_sx_bind_clash.
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(define
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go-keywords
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(list
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"break"
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"case"
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"chan"
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"const"
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"continue"
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"default"
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"defer"
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"else"
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"fallthrough"
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"for"
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"func"
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"go"
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"goto"
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"if"
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"import"
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"interface"
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"map"
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"package"
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"range"
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"return"
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"select"
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"struct"
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"switch"
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"type"
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"var"))
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(define go-keyword? (fn (s) (some (fn (k) (= k s)) go-keywords)))
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(define go-asi-keywords (list "break" "continue" "fallthrough" "return"))
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(define go-asi-ops (list "++" "--" ")" "]" "}"))
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(define go-asi-lit-types (list "ident" "int" "float" "imag" "string" "rune"))
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(define
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go-asi-trigger?
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(fn
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(tok)
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(if
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(= tok nil)
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false
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(let
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((ty (get tok :type)) (v (get tok :value)))
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(or
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(some (fn (lt) (= lt ty)) go-asi-lit-types)
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(and (= ty "keyword") (some (fn (k) (= k v)) go-asi-keywords))
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(and (= ty "op") (some (fn (o) (= o v)) go-asi-ops)))))))
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(define
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go-tokenize
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(fn
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(src)
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(let
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((tokens (list)) (pos 0) (src-len (len src)))
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(define
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gl-peek
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(fn
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(offset)
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(if (< (+ pos offset) src-len) (nth src (+ pos offset)) nil)))
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(define gl-cur (fn () (gl-peek 0)))
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(define gl-advance! (fn (n) (set! pos (+ pos n))))
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(define
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gl-last
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(fn
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()
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(if
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(= (len tokens) 0)
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nil
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(nth tokens (- (len tokens) 1)))))
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(define gl-emit! (fn (type value start) (append! tokens {:type type :value value :pos start})))
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(define
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gl-maybe-asi!
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(fn
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(at)
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(when (go-asi-trigger? (gl-last)) (gl-emit! "semi" "\n" at))))
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(define
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gl-oct-digit?
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(fn (c) (and (not (= c nil)) (>= c "0") (<= c "7"))))
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(define gl-bin-digit? (fn (c) (or (= c "0") (= c "1"))))
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(define
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gl-skip-line!
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(fn
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()
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(when
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(and (< pos src-len) (not (= (gl-cur) "\n")))
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(gl-advance! 1)
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(gl-skip-line!))))
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(define
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gl-skip-block!
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(fn
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(saw-nl)
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(cond
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(>= pos src-len)
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saw-nl
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(and (= (gl-cur) "*") (= (gl-peek 1) "/"))
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(do (gl-advance! 2) saw-nl)
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:else (let
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((is-nl (= (gl-cur) "\n")))
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(gl-advance! 1)
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(gl-skip-block! (or saw-nl is-nl))))))
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(define
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gl-read-ident!
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(fn
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(start)
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(when
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(and (< pos src-len) (lex-ident-char? (gl-cur)))
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(gl-advance! 1)
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(gl-read-ident! start))
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(slice src start pos)))
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(define
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gl-read-digit-run!
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(fn
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(digit?)
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(when
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(and (< pos src-len) (or (digit? (gl-cur)) (= (gl-cur) "_")))
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(gl-advance! 1)
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(gl-read-digit-run! digit?))))
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(define
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gl-finish-number!
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(fn
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(has-fraction?)
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(let
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((typ (if has-fraction? "float" "int")))
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(when
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(or (= (gl-cur) "e") (= (gl-cur) "E"))
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(gl-advance! 1)
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(when
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(or (= (gl-cur) "+") (= (gl-cur) "-"))
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(gl-advance! 1))
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(gl-read-digit-run! lex-digit?)
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(set! typ "float"))
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(cond
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(= (gl-cur) "i")
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(do (gl-advance! 1) "imag")
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:else typ))))
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(define
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gl-read-number!
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(fn
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()
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(cond
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(and (= (gl-cur) ".") (lex-digit? (gl-peek 1)))
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(do
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(gl-advance! 1)
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(gl-read-digit-run! lex-digit?)
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(gl-finish-number! true))
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(and
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(= (gl-cur) "0")
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(or
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(= (gl-peek 1) "x")
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(= (gl-peek 1) "X")))
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(do
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(gl-advance! 2)
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(gl-read-digit-run! lex-hex-digit?)
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"int")
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(and
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(= (gl-cur) "0")
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(or
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(= (gl-peek 1) "b")
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(= (gl-peek 1) "B")))
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(do
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(gl-advance! 2)
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(gl-read-digit-run! gl-bin-digit?)
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"int")
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(and
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(= (gl-cur) "0")
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(or
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(= (gl-peek 1) "o")
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(= (gl-peek 1) "O")))
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(do
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(gl-advance! 2)
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(gl-read-digit-run! gl-oct-digit?)
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"int")
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:else (do
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(gl-read-digit-run! lex-digit?)
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(cond
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(and (= (gl-cur) ".") (not (= (gl-peek 1) ".")))
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(do
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(gl-advance! 1)
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(gl-read-digit-run! lex-digit?)
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(gl-finish-number! true))
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:else (gl-finish-number! false))))))
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(define
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gl-read-string!
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(fn
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()
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(gl-advance! 1)
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(let
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((chars (list)))
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(define
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gl-string-loop
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(fn
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()
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(cond
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(>= pos src-len)
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nil
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(= (gl-cur) "\"")
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(gl-advance! 1)
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(= (gl-cur) "\\")
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(do
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(gl-advance! 1)
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(when
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(< pos src-len)
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(let
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((ch (gl-cur)))
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(cond
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(= ch "n")
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(append! chars "\n")
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(= ch "t")
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(append! chars "\t")
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(= ch "r")
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(append! chars "\r")
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(= ch "\\")
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(append! chars "\\")
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(= ch "\"")
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(append! chars "\"")
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(= ch "'")
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(append! chars "'")
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:else (append! chars ch))
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(gl-advance! 1)))
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(gl-string-loop))
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:else (do
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(append! chars (gl-cur))
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(gl-advance! 1)
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(gl-string-loop)))))
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(gl-string-loop)
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(join "" chars))))
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(define
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gl-read-raw-string!
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(fn
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()
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(gl-advance! 1)
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(let
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((chars (list)))
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(define
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gl-raw-loop
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(fn
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()
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(cond
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(>= pos src-len)
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nil
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(= (gl-cur) "`")
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(gl-advance! 1)
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(= (gl-cur) "\r")
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(do (gl-advance! 1) (gl-raw-loop))
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:else (do
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(append! chars (gl-cur))
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(gl-advance! 1)
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(gl-raw-loop)))))
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(gl-raw-loop)
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(join "" chars))))
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(define
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gl-read-rune!
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(fn
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()
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(gl-advance! 1)
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(let
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((chars (list)))
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(cond
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(and (< pos src-len) (= (gl-cur) "\\"))
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(do
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(gl-advance! 1)
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(when
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(< pos src-len)
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(let
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((ch (gl-cur)))
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(cond
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(= ch "n")
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(append! chars "\n")
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(= ch "t")
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(append! chars "\t")
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(= ch "r")
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(append! chars "\r")
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(= ch "\\")
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(append! chars "\\")
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(= ch "'")
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(append! chars "'")
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(= ch "\"")
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(append! chars "\"")
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:else (append! chars ch))
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(gl-advance! 1))))
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(< pos src-len)
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(do (append! chars (gl-cur)) (gl-advance! 1)))
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(when
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(and (< pos src-len) (= (gl-cur) "'"))
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(gl-advance! 1))
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(join "" chars))))
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(define
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gl-match-op
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(fn
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()
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(let
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((c0 (gl-cur))
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(c1 (gl-peek 1))
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(c2 (gl-peek 2)))
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(cond
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(and (= c0 "<") (= c1 "<") (= c2 "="))
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"<<="
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(and (= c0 ">") (= c1 ">") (= c2 "="))
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">>="
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(and (= c0 "&") (= c1 "^") (= c2 "="))
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"&^="
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(and (= c0 ".") (= c1 ".") (= c2 "."))
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"..."
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(and (= c0 "=") (= c1 "="))
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"=="
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(and (= c0 "!") (= c1 "="))
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"!="
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(and (= c0 "<") (= c1 "="))
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"<="
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(and (= c0 ">") (= c1 "="))
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">="
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(and (= c0 "&") (= c1 "&"))
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"&&"
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(and (= c0 "|") (= c1 "|"))
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"||"
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(and (= c0 "+") (= c1 "+"))
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"++"
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(and (= c0 "-") (= c1 "-"))
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"--"
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(and (= c0 "<") (= c1 "<"))
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"<<"
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(and (= c0 ">") (= c1 ">"))
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">>"
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(and (= c0 "+") (= c1 "="))
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"+="
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(and (= c0 "-") (= c1 "="))
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"-="
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(and (= c0 "*") (= c1 "="))
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"*="
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(and (= c0 "/") (= c1 "="))
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"/="
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(and (= c0 "%") (= c1 "="))
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"%="
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(and (= c0 "&") (= c1 "="))
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"&="
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(and (= c0 "|") (= c1 "="))
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"|="
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(and (= c0 "^") (= c1 "="))
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"^="
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(and (= c0 ":") (= c1 "="))
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":="
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(and (= c0 "<") (= c1 "-"))
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"<-"
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(and (= c0 "&") (= c1 "^"))
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"&^"
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(or
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(= c0 "+")
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(= c0 "-")
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(= c0 "*")
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(= c0 "/")
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(= c0 "%")
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(= c0 "&")
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(= c0 "|")
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(= c0 "^")
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(= c0 "<")
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(= c0 ">")
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(= c0 "=")
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(= c0 "!")
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(= c0 "(")
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(= c0 ")")
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(= c0 "{")
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(= c0 "}")
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(= c0 "[")
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(= c0 "]")
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(= c0 ",")
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(= c0 ".")
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(= c0 ":"))
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c0
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:else nil))))
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(define
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gl-scan!
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(fn
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()
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(cond
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(>= pos src-len)
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nil
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(= (gl-cur) "\n")
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(do (gl-maybe-asi! pos) (gl-advance! 1) (gl-scan!))
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(lex-space? (gl-cur))
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(do (gl-advance! 1) (gl-scan!))
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(and (= (gl-cur) "/") (= (gl-peek 1) "/"))
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(do (gl-advance! 2) (gl-skip-line!) (gl-scan!))
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(and (= (gl-cur) "/") (= (gl-peek 1) "*"))
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(do
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(gl-advance! 2)
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(let
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((saw-nl (gl-skip-block! false)))
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(when saw-nl (gl-maybe-asi! pos)))
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(gl-scan!))
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(= (gl-cur) ";")
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(do
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(gl-emit! "semi" ";" pos)
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(gl-advance! 1)
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(gl-scan!))
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(lex-ident-start? (gl-cur))
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(do
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(let
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((start pos))
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(gl-read-ident! start)
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(let
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((word (slice src start pos)))
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(gl-emit!
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(if (go-keyword? word) "keyword" "ident")
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word
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start)))
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(gl-scan!))
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(lex-digit? (gl-cur))
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(do
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(let
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((start pos) (typ (gl-read-number!)))
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(gl-emit! typ (slice src start pos) start))
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(gl-scan!))
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(and (= (gl-cur) ".") (lex-digit? (gl-peek 1)))
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(do
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(let
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((start pos) (typ (gl-read-number!)))
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(gl-emit! typ (slice src start pos) start))
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(gl-scan!))
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(= (gl-cur) "\"")
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(let
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((start pos) (v (gl-read-string!)))
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(gl-emit! "string" v start)
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(gl-scan!))
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(= (gl-cur) "`")
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(let
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((start pos) (v (gl-read-raw-string!)))
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(gl-emit! "string" v start)
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(gl-scan!))
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(= (gl-cur) "'")
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(let
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((start pos) (v (gl-read-rune!)))
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(gl-emit! "rune" v start)
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(gl-scan!))
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:else (let
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((op (gl-match-op)))
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(cond
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op
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(do
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(gl-emit! "op" op pos)
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(gl-advance! (len op))
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(gl-scan!))
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:else (do (gl-advance! 1) (gl-scan!)))))))
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(gl-scan!)
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(gl-maybe-asi! pos)
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(gl-emit! "eof" nil pos)
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tokens)))
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