Complete parser & ludus grammar!
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23e29fdca2
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f97453b813
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@ -8,29 +8,78 @@
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(def terminator (choice :terminator [:newline :semicolon]))
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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 nls? (quiet (zero+ :nls :newline)))
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(def splat (group (order :splat [(quiet :splat) :word])))
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(def splattern (group (order :splat [(quiet :splattern) (flat (choice :splatted [:word :ignored :placeholder]))])))
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(def splattern (group (order :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-pat-term (choice :tuple-pat-term [pattern splattern]))
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(def tuple-pattern-term (choice :tuple-pattern-term [pattern splattern]))
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(def tuple-pat-entry (order :tuple-pat-enry [(quiet (one+ separator)) pattern]))
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(def tuple-pattern-entries (entries :tuple-pattern-enries separator pattern))
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(def tuple-pat (group (order :tuple-pat
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(def tuple-pattern (group (order :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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(zero+ tuple-pat-entry)
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tuple-pattern-entries
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(quiet (zero+ separator))
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(quiet :rparen)])))
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;; TODO: list, dict, struct patterns
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(def list-pattern (group (order :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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(quiet :rbracket)])))
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(def pattern (choice :pattern [:literal :ignored :placeholder :word :keyword tuple-pat]))
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(def pair-pattern (order :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 (group (order :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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(quiet :rbrace)
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])))
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(def struct-pattern (group (order :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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(quiet :rbrace)
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])))
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(def constraint (order :constraint [: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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[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 (group (order :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 :rbrace)
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])))
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(def iff (order :if [(quiet :if)
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nls?
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@ -46,78 +95,96 @@
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(def cond-clause (group (order :cond-clause [cond-lhs (quiet :rarrow) expression])))
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(def cond-entry (order :cond-entry [(quiet (one+ terminator)) cond-clause]))
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(def cond-entries (entries :cond-entries terminator cond-clause))
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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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(zero+ cond-entry)
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cond-entries
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(quiet (zero+ terminator))
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(quiet :rbrace)]))
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(def lett (order :let [(quiet :let)
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(def lett (group (order :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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expression])))
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(def tuple-entry (order :tuple-entry [(quiet (one+ separator)) expression]))
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(def tuple-entry (weak (order :tuple-entry [(quiet (one+ separator)) expression])))
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(def tuple (order :tuple
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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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(zero+ tuple-entry)
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tuple-entries
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(quiet (zero+ separator))
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(quiet :rparen)]))
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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 (order :list-entry [(quiet (one+ separator)) list-term]))
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(def list-entry (weak (order :list-entry [(quiet (one+ separator)) list-term])))
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(def listt (order :list
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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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[(quiet :lbracket)
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(quiet (zero+ separator))
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(maybe list-term)
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(zero+ list-entry)
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list-entries
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(quiet (zero+ separator))
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(quiet :rbracket)]))
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(quiet :rbracket)])))
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(def sett (group (order :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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(quiet :rbrace)])))
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(def pair (group (order :pair [:keyword expression])))
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(def struct-term (flat (choice :struct-term [:word pair])))
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(def struct-entry (order :struct-entry [(quiet (one+ separator)) struct-term]))
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(def struct-entry (weak (order :struc-entry [(quiet (one+ separator)) struct-term])))
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(def structt (order :struct
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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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[(quiet :startstruct)
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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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struct-entries
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(quiet (zero+ separator))
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(quiet :rbrace)]))
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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 (order :dict-entry [(quiet (one+ separator)) dict-term]))
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(def dict-entry (weak (order :dict-entry [(quiet (one+ separator)) dict-term])))
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(def dict (order :dict
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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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[(quiet :startdict)
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(quiet (zero+ separator))
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(maybe dict-term)
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(zero+ dict-entry)
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dict-entries
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(quiet (zero+ separator))
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(quiet :rbrace)]))
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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 (order :arg-entry [(quiet (one+ separator)) arg-expr]))
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(def arg-entry (weak (order :arg-entry [(quiet (one+ separator)) arg-expr])))
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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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[(quiet :lparen)
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(quiet (zero+ separator))
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(maybe arg-expr)
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(zero+ arg-entry)
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arg-entries
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(quiet (zero+ separator))
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(quiet :rparen)]))
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@ -127,14 +194,18 @@
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(def synthetic (order :synthetic [synth-root (zero+ synth-term)]))
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(def fn-clause (group (order :fn-clause [tuple-pat (quiet :rarrow) expression])))
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(def fn-clause (group (order :fn-clause [tuple-pattern (maybe constraint) (quiet :rarrow) expression])))
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(def fn-entry (order :fn-entry [(quiet (one+ terminator)) fn-clause]))
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(def fn-entry (weak (order :fn-entry [(quiet (one+ terminator)) fn-clause])))
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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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nls?
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(maybe :string)
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nls?
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fn-clause
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(zero+ fn-entry)
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fn-entries
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nls?
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(quiet :rbrace)
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])))
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@ -147,11 +218,68 @@
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(def fnn (group (order :fn [(quiet :fn) body])))
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(def block-line (order :block-line [(quiet terminator) expression]))
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(def block-lines (entries :block-lines terminator expression))
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(def block (group (order :block [(quiet :lbrace) nls? expression (zero+ block-line) nls? (quiet :rbrace)])))
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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 expression (flat (choice :expression [fnn lett iff condd synthetic block structt listt tuple literal])))
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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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expression
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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 spawn (group (order :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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(quiet :rbrace)
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])))
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(def compound-loop (group (order :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 :rbrace)])))
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(def loopp (group (order :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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(def expression (flat (choice :expression [fnn
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match
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loopp
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lett
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iff
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condd
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spawn
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receive
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synthetic
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block
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doo
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reff
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structt
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dict
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listt
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sett
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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 importt (group (order :import [(quiet :import) :string (quiet :as) :word])))
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@ -164,19 +292,28 @@
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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])))
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(def toplevel (flat (choice :toplevel [importt nss expression test])))
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(def script-line (order :script-line [(quiet (one+ terminator)) toplevel]))
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(def script-lines (entries :script-lines terminator toplevel))
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(def script (order :script [nls? toplevel (zero+ script-line) nls? (quiet :eof)]))
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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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(quiet :eof)]))
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;;;;;;;;;;;;;;;; REPL CRUFT
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;;TODO: improve current bug reporting in the parser
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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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(def eg (:tokens (scan/scan
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"receive { _ -> 1; () -> 2 }
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"
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add (1, 2)
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fn foo { (_) -> (1, 2) }"
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)))
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@ -201,12 +338,9 @@ fn foo { (_) -> (1, 2) }"
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(defn tap [x] (println "\n\n\n\n******NEW PARSE\n\n:::=> " x "\n\n") x)
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(def my-data (-> result clean tap))
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(def my-data (-> result
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clean
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tap
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))
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my-data
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(def my-first (-> my-data first))
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(def my-sec (map :data (-> my-data second :data)))
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(concat my-first my-sec)
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@ -28,6 +28,7 @@
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(defn apply-kw-parser [kw tokens]
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(let [token (first tokens)]
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(if (= kw (:type token)) (println "Matched " kw))
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(if (= kw (:type token))
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{:status :ok
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:type kw
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@ -37,10 +38,12 @@
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{:status :none :token token :trace [kw] :remaining (rest tokens)})))
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(defn apply-fn-parser [parser tokens]
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(let [rule (:rule parser) name (:name parser)]
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(rule tokens)))
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(let [rule (:rule parser) name (:name parser) result (rule tokens)]
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(if (pass? result) (println "Matched " (:name parser)))
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result))
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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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(keyword? parser) (apply-kw-parser parser tokens)
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(:rule parser) (apply-fn-parser parser tokens)
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@ -139,7 +142,11 @@
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:group (recur (vec (concat results (:data result))) (remaining result))
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:quiet (recur results (remaining result))
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:err (update result :trace #(conj % name))
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{:status :group :type name :data results :token (first tokens) :remaining ts}))))}))
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:none {:status :group
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:type name
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:data results
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:token (first tokens)
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:remaining ts}))))}))
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(defn one+
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([parser] (one+ (pname parser) parser))
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@ -196,6 +203,16 @@
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(assoc result :status :ok)
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result)))}))
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(defn weak
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([parser] (weak (pname parser) parser))
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([name parser]
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{:name (kw+str name "-weak")
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:rule (fn weak-fn [tokens]
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(let [result (apply-parser parser tokens)]
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(if (= :err (:status result))
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(assoc result :status :none)
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result)))}))
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(defn err-msg [{token :token trace :trace}]
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(println "Unexpected token " (:type token) " on line " (:line token))
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(println "Expected token " (first trace)))
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Block a user