Keep grinding; problems now with order/repeats
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f97453b813
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@ -4,84 +4,76 @@
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(declare expression pattern)
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(def separator (choice :separator [:comma :newline]))
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(def separator (choice :separator [:comma :newline :break]))
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(def terminator (choice :terminator [:newline :semicolon]))
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(def separators (quiet (one+ separator)))
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(defn entries [name sep parser]
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(zero+ (weak (order name [(quiet (one+ sep)) parser]))))
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(def terminator (choice :terminator [:newline :semicolon :break]))
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(def terminators (quiet (one+ terminator)))
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(def nls? (quiet (zero+ :nls :newline)))
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(def splat (group (order :splat [(quiet :splat) :word])))
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(def splat (group (order-1 :splat [(quiet :splat) :word])))
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(def splattern (group (order :splat [(quiet :splat) (flat (choice :splatted [:word :ignored :placeholder]))])))
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(def splattern (group (order-1 :splat [(quiet :splat) (flat (choice :splatted [:word :ignored :placeholder]))])))
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(def literal (flat (choice :literal [:nil :true :false :number :string])))
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(def tuple-pattern-term (choice :tuple-pattern-term [pattern splattern]))
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(def tuple-pattern-term (flat (choice :tuple-pattern-term [pattern splattern])))
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(def tuple-pattern-entries (entries :tuple-pattern-enries separator pattern))
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(def tuple-pattern-entry (order-1 :tuple-pattern-entry [tuple-pattern-term (quiet (one+ separator))]))
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(def tuple-pattern (group (order :tuple-pattern
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(def tuple-pattern (group (order-1 :tuple-pattern
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[(quiet :lparen)
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(quiet (zero+ separator))
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(maybe pattern)
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tuple-pattern-entries
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(quiet (zero+ separator))
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(zero+ tuple-pattern-entry)
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(quiet :rparen)])))
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(def list-pattern (group (order :list-pattern
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(def list-pattern (group (order-1 :list-pattern
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[(quiet :lbracket)
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(quiet (zero+ separator))
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(maybe pattern)
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tuple-pattern-entries
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(quiet (zero+ separator))
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(zero+ tuple-pattern-entry)
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(quiet :rbracket)])))
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(def pair-pattern (order :pair-pattern [:keyword pattern]))
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(def pair-pattern (order-0 :pair-pattern [:keyword pattern]))
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(def dict-pattern-term (flat (choice :dict-pattern-term [pair-pattern :word splattern])))
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(def dict-pattern-entries (entries :dict-pattern-entries separator dict-pattern-term))
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(def dict-pattern-entry (order-1 :dict-pattern-entry [dict-pattern-term (quiet (one+ separator))]))
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(def dict-pattern (group (order :dict-pattern
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(def dict-pattern (group (order-1 :dict-pattern
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[(quiet :startdict)
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(quiet (zero+ separator))
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(maybe dict-pattern-term)
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dict-pattern-entries
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(quiet (zero+ separator))
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(zero+ dict-pattern-entry)
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(quiet :rbrace)
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])))
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(def struct-pattern (group (order :struct-pattern
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(def struct-pattern (group (order-1 :struct-pattern
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[(quiet :startstruct)
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(quiet (zero+ separator))
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(maybe dict-pattern-term)
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dict-pattern-entries
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(quiet (zero+ separator))
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(zero+ dict-pattern-entry)
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(quiet :rbrace)
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])))
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(def constraint (order :constraint [:when expression]))
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(def constraint (order-0 :constraint [(quiet :when) expression]))
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(def pattern (choice :pattern [literal :ignored :placeholder :word :keyword tuple-pattern dict-pattern struct-pattern list-pattern]))
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(def match-clause (group (order :match-clause
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(def match-clause (group (order-0 :match-clause
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[pattern (maybe constraint) (quiet :rarrow) expression])))
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(def match-entries (entries :match-entries terminator match-clause))
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(def match-entry (order-0 :match-entry [match-clause (quiet (one+ terminator))]))
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(def match (group (order :match
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(def match (group (order-1 :match
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[(quiet :match) expression nls?
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(quiet :with) (quiet :lbrace) nls?
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match-clause
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match-entries
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nls?
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(quiet :with) (quiet :lbrace)
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(quiet (zero+ terminator))
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(one+ match-entry)
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(quiet :rbrace)
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])))
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(def iff (order :if [(quiet :if)
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(def iff (order-1 :if [(quiet :if)
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nls?
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expression
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nls?
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@ -93,170 +85,137 @@
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(def cond-lhs (flat (choice :cond-lhs [expression :placeholder :else])))
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(def cond-clause (group (order :cond-clause [cond-lhs (quiet :rarrow) expression])))
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(def cond-clause (group (order-0 :cond-clause [cond-lhs (quiet :rarrow) expression])))
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(def cond-entries (entries :cond-entries terminator cond-clause))
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(def cond-entry (order-0 :cond-entry [cond-clause (quiet (one+ terminator))]))
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(def condd (order :cond [(quiet :cond) (quiet :lbrace)
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(quiet (zero+ terminator))
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cond-clause
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cond-entries
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(def condd (order-1 :cond [(quiet :cond) (quiet :lbrace)
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(quiet (zero+ terminator))
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(one+ cond-entry)
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(quiet :rbrace)]))
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(def lett (group (order :let [(quiet :let)
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(def lett (group (order-1 :let [(quiet :let)
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pattern
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(quiet :equals)
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nls?
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expression])))
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(def tuple-entry (weak (order :tuple-entry [(quiet (one+ separator)) expression])))
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(def tuple-entry (order-1 :tuple-entry [expression separators]))
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(def tuple-entries (entries :tuple-entries separator expression))
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(def tuple (group (order :tuple
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[(quiet :lparen)
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(quiet (zero+ separator))
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(maybe expression)
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tuple-entries
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(def tuple (group (order-1 :tuple [(quiet :lparen)
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(quiet (zero+ separator))
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(zero+ tuple-entry)
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(quiet :rparen)])))
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(def list-term (flat (choice :list-term [splat expression])))
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(def list-entry (weak (order :list-entry [(quiet (one+ separator)) list-term])))
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(def list-entry (order-1 :list-entry [list-term separators]))
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(def list-entries (entries :list-entries separator list-term))
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(def listt (group (order :list
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(def listt (group (order-1 :list
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[(quiet :lbracket)
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(quiet (zero+ separator))
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(maybe list-term)
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list-entries
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(quiet (zero+ separator))
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(zero+ list-entry)
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(quiet :rbracket)])))
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(def sett (group (order :set [
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(def sett (group (order-1 :set [
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(quiet :startset)
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(quiet (zero+ separator))
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(maybe list-term)
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list-entries
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(quiet (zero+ separator))
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(zero+ list-entry)
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(quiet :rbrace)])))
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(def pair (group (order :pair [:keyword expression])))
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(def pair (group (order-0 :pair [:keyword expression])))
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(def struct-term (flat (choice :struct-term [:word pair])))
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(def struct-entry (weak (order :struc-entry [(quiet (one+ separator)) struct-term])))
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(def struct-entry (order-1 :struct-entry [struct-term separators]))
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(def struct-entries (entries :struct-entries separator struct-term))
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(def structt (group (order :struct
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(def structt (group (order-1 :struct
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[(quiet :startstruct)
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(quiet (zero+ separator))
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(maybe struct-term)
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struct-entries
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(quiet (zero+ separator))
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(zero+ struct-entry)
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(quiet :rbrace)])))
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(def dict-term (flat (choice :dict-term [:word pair splat])))
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(def dict-entry (weak (order :dict-entry [(quiet (one+ separator)) dict-term])))
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(def dict-entry (order-1 :dict-entry [dict-term separators]))
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(def dict-entries (entries :dict-entries separator dict-term))
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(def dict (group (order :dict
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(def dict (group (order-1 :dict
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[(quiet :startdict)
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(quiet (zero+ separator))
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(maybe dict-term)
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dict-entries
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(quiet (zero+ separator))
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(zero+ dict-entry)
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(quiet :rbrace)])))
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(def arg-expr (flat (choice :arg-expr [:placeholder expression])))
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(def arg-entry (weak (order :arg-entry [(quiet (one+ separator)) arg-expr])))
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(def arg-entry (order-1 :arg-entry [arg-expr separators]))
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(def arg-entries (entries :arg-entries separator arg-expr))
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(def arg-tuple (order :arg-tuple
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(def arg-tuple (order-1 :arg-tuple
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[(quiet :lparen)
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(quiet (zero+ separator))
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(maybe arg-expr)
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arg-entries
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(quiet (zero+ separator))
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(zero+ arg-entry)
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(quiet :rparen)]))
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(def synth-root (choice :synth-root [:keyword :word :recur]))
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(def synth-term (choice :synth-term [arg-tuple :keyword]))
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(def synthetic (order :synthetic [synth-root (zero+ synth-term)]))
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(def synthetic (order-1 :synthetic [synth-root (zero+ synth-term)]))
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(def fn-clause (group (order :fn-clause [tuple-pattern (maybe constraint) (quiet :rarrow) expression])))
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(def fn-clause (group (order-0 :fn-clause [tuple-pattern (maybe constraint) (quiet :rarrow) expression])))
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(def fn-entry (weak (order :fn-entry [(quiet (one+ terminator)) fn-clause])))
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(def fn-entry (order-1 :fn-entry [fn-clause terminators]))
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(def fn-entries (entries :fn-entries terminator fn-clause))
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(def compound (group (order :compound [(quiet :lbrace)
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(def compound (group (order-1 :compound [(quiet :lbrace)
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nls?
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(maybe :string)
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nls?
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fn-clause
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fn-entries
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nls?
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(quiet (zero+ terminator))
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(one+ fn-entry)
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(quiet :rbrace)
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])))
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(def clauses (flat (choice :clauses [compound fn-clause])))
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(def clauses (flat (choice :clauses [fn-clause compound])))
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(def named (group (order :named [:word clauses])))
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(def named (group (order-1 :named [:word clauses])))
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(def body (flat (choice :body [fn-clause named])))
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(def fnn (group (order :fn [(quiet :fn) body])))
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(def fnn (group (order-1 :fn [(quiet :fn) body])))
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(def block-lines (entries :block-lines terminator expression))
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(def block-line (order-1 :block-line [expression terminators]))
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(def block (group (order :block [(quiet :lbrace)
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nls?
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expression
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block-lines
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nls? (quiet :rbrace)])))
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(def pipeline (order :pipeline [nls? :pipeline]))
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(def do-entry (weak (order :do-entry [pipeline expression])))
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(def doo (group (order :do [
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(quiet :do)
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(def block (group (order-1 :block [(quiet :lbrace)
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(quiet (zero+ terminator))
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(zero+ block-line)
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(quiet :rbrace)])))
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(def pipeline (order-0 :pipeline [nls? :pipeline]))
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(def do-entry (order-0 :do-entry [pipeline expression]))
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(def doo (group (order-1 :do [(quiet :do)
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expression
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;; should this be zero+?
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(one+ do-entry)
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])))
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(def reff (group (order :ref [(quiet :ref) :word (quiet :equals) expression])))
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(def reff (group (order-1 :ref [(quiet :ref) :word (quiet :equals) expression])))
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(def spawn (group (order :spawn [(quiet :spawn) expression])))
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(def spawn (group (order-1 :spawn [(quiet :spawn) expression])))
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(def receive (group (order :receive
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[(quiet :receive) (quiet :lbrace) nls?
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match-clause
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match-entries
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nls?
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(def receive (group (order-1 :receive
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[(quiet :receive) (quiet :lbrace)
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(quiet (zero+ terminator))
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(one+ match-entry)
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(quiet :rbrace)
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])))
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(def compound-loop (group (order :compound-loop
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(def compound-loop (group (order-0 :compound-loop
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[(quiet :lbrace)
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nls?
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fn-clause
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fn-entries
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nls?
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(quiet (zero+ terminator))
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(one+ fn-entry)
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(quiet :rbrace)])))
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(def loopp (group (order :loop
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(def loopp (group (order-1 :loop
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[(quiet :loop) tuple (quiet :with)
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(flat (choice :loop-body [fn-clause compound-loop]))])))
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@ -279,27 +238,23 @@
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tuple
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literal])))
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(def test (group (order :test [(quiet :test) :string expression])))
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(def testt (group (order-1 :test [(quiet :test) :string expression])))
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(def importt (group (order :import [(quiet :import) :string (quiet :as) :word])))
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(def importt (group (order-1 :import [(quiet :import) :string (quiet :as) :word])))
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(def nss (group (order :nss [(quiet :ns)
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(def nss (group (order-1 :nss [(quiet :ns)
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:word
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(quiet :lbrace)
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(quiet (zero+ separator))
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(maybe struct-term)
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(zero+ struct-entry)
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(quiet (zero+ separator))
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(quiet :rbrace)])))
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(def toplevel (flat (choice :toplevel [importt nss expression test])))
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(def toplevel (flat (choice :toplevel [importt nss expression testt])))
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(def script-lines (entries :script-lines terminator toplevel))
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(def script-line (order-0 :script-line [toplevel terminators]))
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(def script (order :script [nls?
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toplevel
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script-lines
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nls?
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(def script (order-0 :script [nls?
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(one+ script-line)
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(quiet :eof)]))
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@ -309,16 +264,16 @@
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;; --e.g., give functions better names in the stack trace
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;; --I think this might require a macro (::facepalm::)
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;;TODO: fix forward declaration errors
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;;TODO: in, e.g., script-line (repeated, separated entities -- zero/one+->order), order-0 gives an error before a closing token (in this case, :eof), because it's not a line; but using order-1 parses correctly but swallows orders further down. I need to revisit how no match vs. errors pass through the system, esp. the combination of repeats and orders
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(def eg (:tokens (scan/scan
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"receive { _ -> 1; () -> 2 }
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"
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"{1; 2; 3; (1, _)}"
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)))
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(def result (apply-parser script eg))
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(def result (apply-parser block eg))
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(defn report [node]
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@ -44,10 +44,13 @@
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(defn apply-parser [parser tokens]
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(println "Applying parser " (? (:name parser) parser))
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(cond
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(let [result (cond
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(keyword? parser) (apply-kw-parser parser tokens)
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(:rule parser) (apply-fn-parser parser tokens)
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:else (throw (Exception. "`apply-parser` requires a parser"))))
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:else (throw (Exception. "`apply-parser` requires a parser")))]
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(println "Parser result " (? (:name parser) parser) (:status result))
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result
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))
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(defn choice [name parsers]
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{:name name
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@ -67,8 +70,9 @@
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{:status :none :token (first tokens) :trace [name] :remaining rem-ts}
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:else (recur rem-ps)))))})
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(defn order [name parsers]
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;; TODO - figure out a scheme for zero and one lookahead
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;; Lookahead isn't even the right term here
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(defn order-1 [name parsers]
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{:name name
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:rule (fn order-fn [tokens]
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(let [origin (first tokens)
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|
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@ -121,6 +125,49 @@
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(:err :none)
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(assoc (update result :trace #(conj % name)) :status :err))))))))})
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(defn order-0 [name parsers]
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{:name name
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:rule (fn order-fn [tokens]
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(let [origin (first tokens)]
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(loop [ps parsers
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results []
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ts tokens]
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(let [result (apply-parser (first ps) ts)
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res-rem (remaining result)]
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(if (empty? (rest ps))
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;; Nothing more: return
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(case (:status result)
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:ok {:status :group
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:type name
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:data (conj results result)
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:token origin
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:remaining res-rem}
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:quiet {:status :group
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:type name
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:data results
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:token origin
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:remaining res-rem}
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:group {:status :group
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:type name
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:data (vec (concat results (:data result)))
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:token origin
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:remaining res-rem}
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(:err :none)
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(assoc (update result :trace #(conj % name)) :status :err))
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|
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;; Still parsers left in the vector: recur
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(case (:status result)
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:ok (recur (rest ps) (conj results result) res-rem)
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:group (recur (rest ps)
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(vec (concat results (:data result)))
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res-rem)
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:quiet (recur (rest ps) results res-rem)
|
||||
(:err :none)
|
||||
(assoc (update result :trace #(conj % name)) :status :err)))))))})
|
||||
|
||||
(defn quiet [parser]
|
||||
{:name (kw+str (? (:name parser) parser) "-quiet")
|
||||
:rule (fn quiet-fn [tokens]
|
||||
|
|
@ -158,11 +205,23 @@
|
|||
(case (:status first-result)
|
||||
(:ok :group)
|
||||
(let [rest-result (apply-parser rest-parser (remaining first-result))]
|
||||
(case (:status rest-result)
|
||||
|
||||
(:ok :group :quiet)
|
||||
{:status :group
|
||||
:type name
|
||||
:data (vec (concat [first-result] (data rest-result)))
|
||||
:token (first tokens)
|
||||
:remaining (remaining rest-result)})
|
||||
:remaining (remaining rest-result)}
|
||||
|
||||
:none {:status :group :type name
|
||||
:data first-result
|
||||
:token (first tokens)
|
||||
:remaining (remaining rest-result)}
|
||||
|
||||
:err (update rest-result :trace #(conj % name)))
|
||||
|
||||
)
|
||||
|
||||
:quiet
|
||||
(let [rest-result (apply-parser rest-parser (remaining first-result))]
|
||||
|
|
@ -203,49 +262,6 @@
|
|||
(assoc result :status :ok)
|
||||
result)))}))
|
||||
|
||||
(defn weak
|
||||
([parser] (weak (pname parser) parser))
|
||||
([name parser]
|
||||
{:name (kw+str name "-weak")
|
||||
:rule (fn weak-fn [tokens]
|
||||
(let [result (apply-parser parser tokens)]
|
||||
(if (= :err (:status result))
|
||||
(assoc result :status :none)
|
||||
result)))}))
|
||||
|
||||
(defn err-msg [{token :token trace :trace}]
|
||||
(println "Unexpected token " (:type token) " on line " (:line token))
|
||||
(println "Expected token " (first trace)))
|
||||
|
||||
(comment
|
||||
"
|
||||
If I'm not mistaken, the Ludus grammer requires *no* lookahead, the first token in an expression tells you what kind of expression it is:
|
||||
|
||||
Rather, there is one ambiguity: synthetic expressions can start with words or keywords.
|
||||
A bare word can be assimilated to synthetic expressions. Interestingly, so can synthetic.
|
||||
|
||||
The parsing strategy is the same: consume as many things until you can't get anymore.
|
||||
|
||||
The fact that a bare keyword is evaluated like a literal doesn't matter.
|
||||
|
||||
So:
|
||||
literal -> literal
|
||||
keyword -> synthetic
|
||||
word -> synthetic
|
||||
( -> tuple
|
||||
[ -> list
|
||||
#{ -> dict
|
||||
@{ -> struct
|
||||
ns -> ns
|
||||
let -> let
|
||||
do -> pipeline
|
||||
|
||||
etc.
|
||||
|
||||
Because there's now NO lookahead, we can easily distinguish between orderings that don't match at all, and ones which match on the first token.
|
||||
|
||||
Because of that, we can also distinguish between no-match and errors
|
||||
|
||||
")
|
||||
|
||||
|
||||
|
|
|
|||
|
|
@ -36,7 +36,7 @@
|
|||
;; type system
|
||||
;; "data" :data ;; we are going to tear out datatypes for now: see if dynamism works for us
|
||||
;; others
|
||||
"repeat" :repeat ;; syntax sugar over "loop": still unclear what this syntax could be
|
||||
;;"repeat" :repeat ;; syntax sugar over "loop": still unclear what this syntax could be
|
||||
"test" :test
|
||||
"when" :when
|
||||
;; "module" :module ;; not necessary if we don't have datatypes
|
||||
|
|
@ -113,11 +113,7 @@
|
|||
(defn- whitespace? [c]
|
||||
(or (= c \space) (= c \tab)))
|
||||
|
||||
;; TODO: update token terminators:
|
||||
;; remove: \|
|
||||
;; add: \>
|
||||
;; research others
|
||||
(def terminators #{\: \; \newline \{ \} \( \) \[ \] \$ \# \- \= \& \, \| nil \\})
|
||||
(def terminators #{\: \; \newline \{ \} \( \) \[ \] \$ \# \- \= \& \, \> nil \\})
|
||||
|
||||
(defn- terminates? [c]
|
||||
(or (whitespace? c) (contains? terminators c)))
|
||||
|
|
@ -176,24 +172,29 @@
|
|||
(digit? curr) (recur (advance scanner) (str num curr) float?)
|
||||
:else (add-error scanner (str "Unexpected " curr " after number " num "."))))))
|
||||
|
||||
;; TODO: add string interpolation
|
||||
;; This still has to be devised
|
||||
;; TODO: activate string interpolation
|
||||
(defn- add-string
|
||||
[scanner]
|
||||
(loop [scanner scanner
|
||||
string ""]
|
||||
string ""
|
||||
interpolate? false]
|
||||
(let [char (current-char scanner)]
|
||||
(case char
|
||||
\newline (add-error scanner "Unterminated string.")
|
||||
\" (add-token (advance scanner) :string string)
|
||||
\{ (recur (update (advance scanner)) (str string char) true)
|
||||
; allow multiline strings
|
||||
\newline (recur (update (advance scanner) :line inc) (str string char) interpolate?)
|
||||
\" (if interpolate?
|
||||
;(add-token (advance scanner) :interpolated string)
|
||||
(add-token (advance scanner) :string string)
|
||||
(add-token (advance scanner) :string string))
|
||||
\\ (let [next (next-char scanner)
|
||||
scanner (if (= next \newline)
|
||||
(update scanner :line inc)
|
||||
scanner)]
|
||||
(recur (advance (advance scanner)) (str string next)))
|
||||
(recur (advance (advance scanner)) (str string next) interpolate?))
|
||||
(if (at-end? scanner)
|
||||
(add-error scanner "Unterminated string.")
|
||||
(recur (advance scanner) (str string char)))))))
|
||||
(recur (advance scanner) (str string char) interpolate?))))))
|
||||
|
||||
(defn- add-word
|
||||
[char scanner]
|
||||
|
|
@ -242,11 +243,13 @@
|
|||
(case char
|
||||
;; one-character tokens
|
||||
\( (add-token scanner :lparen)
|
||||
\) (add-token scanner :rparen)
|
||||
;; :break is a special zero-char token before closing braces
|
||||
;; it makes parsing much simpler
|
||||
\) (add-token (add-token scanner :break) :rparen)
|
||||
\{ (add-token scanner :lbrace)
|
||||
\} (add-token scanner :rbrace)
|
||||
\} (add-token (add-token scanner :break) :rbrace)
|
||||
\[ (add-token scanner :lbracket)
|
||||
\] (add-token scanner :rbracket)
|
||||
\] (add-token (add-token scanner :break) :rbracket)
|
||||
\; (add-token scanner :semicolon)
|
||||
\, (add-token scanner :comma)
|
||||
\newline (add-token (update scanner :line inc) :newline)
|
||||
|
|
@ -261,23 +264,6 @@
|
|||
(digit? next) (add-number char scanner)
|
||||
:else (add-error scanner (str "Expected -> or negative number after `-`. Got `" char next "`")))
|
||||
|
||||
;; at current we're not using this
|
||||
;; <-
|
||||
;;\< (if (= next \-)
|
||||
;; (add-token (advance scanner) :larrow)
|
||||
;; (add-error scanner (str "Expected <-. Got " char next)))
|
||||
|
||||
;; |>
|
||||
;; Consider => , with =>> for bind
|
||||
; \| (if (= next \>)
|
||||
; (add-token (advance scanner) :pipeline)
|
||||
; (add-error scanner (str "Expected |>. Got " char next)))
|
||||
|
||||
;; possible additional operator: bind/result
|
||||
;; possible additional operator: bind/some
|
||||
;; oh god, monads
|
||||
;; additional arrow possibilities: >> ||> ~> => !>
|
||||
|
||||
;; dict #{
|
||||
\# (if (= next \{)
|
||||
(add-token (advance scanner) :startdict)
|
||||
|
|
@ -302,8 +288,6 @@
|
|||
|
||||
;; comments
|
||||
;; & starts an inline comment
|
||||
;; TODO: include comments in scanned file
|
||||
;; TODO, maybe: add doc comments: &&& (or perhaps a docstring in an fn?)
|
||||
\& (add-comment char scanner)
|
||||
|
||||
;; keywords
|
||||
|
|
@ -324,7 +308,7 @@
|
|||
(cond
|
||||
(whitespace? char) scanner ;; for now just skip whitespace characters
|
||||
(digit? char) (add-number char scanner)
|
||||
(upper? char) (add-data char scanner)
|
||||
(upper? char) (add-word char scanner) ;; no datatypes for now
|
||||
(lower? char) (add-word char scanner)
|
||||
:else (add-error scanner (str "Unexpected character: " char))))))
|
||||
|
||||
|
|
@ -334,10 +318,8 @@
|
|||
(defn scan [source]
|
||||
(loop [scanner (new-scanner source)]
|
||||
(if (at-end? scanner)
|
||||
(let [scanner (add-token scanner :eof)]
|
||||
(let [scanner (add-token (add-token scanner :break) :eof)]
|
||||
{:tokens (:tokens scanner)
|
||||
:errors (:errors scanner)})
|
||||
(recur (-> scanner (scan-token) (next-token))))))
|
||||
|
||||
(scan "2 :three true nil")
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user