Rearrange things and implement syntax object builder

2 years ago · 9c6624f19e
parent beba017631
commit 9c6624f19e
4 changed files with 285 additions and 175 deletions
--- a/base/derivation.rkt
+++ b/base/derivation.rkt
@ -0,0 +1,115 @@
+#lang racket/base
+
+
+(require racket/contract/base)
+
+
+(provide
+ (struct-out terminal-derivation)
+ (struct-out nonterminal-derivation)
+ (struct-out syntax-label)
+ (contract-out
+  [parser-derivation? predicate/c]
+  [parser-derivation-first-terminal (-> parser-derivation? any/c)]
+  [parser-derivation-last-terminal (-> parser-derivation? any/c)]
+  [parser-derivation
+   (case->
+    (-> any/c terminal-derivation?)
+    (-> any/c parser-derivation? #:rest (listof parser-derivation?) nonterminal-derivation?))]
+  [parser-derivation->syntax (-> parser-derivation? syntax?)]))
+
+
+(require racket/match
+         racket/sequence
+         racket/struct
+         rebellion/collection/vector
+         yaragg/base/token)
+
+
+;@----------------------------------------------------------------------------------------------------
+
+
+(define (parser-derivation? v)
+  (or (terminal-derivation? v) (nonterminal-derivation? v)))
+
+
+;; A (Terminal-Derivation V) represents a terminal that was matched by the grammar. It contains the
+;; value V of the (Token T V) that was matched.
+(struct terminal-derivation (value) #:transparent)
+
+
+;; A (Nonterminal-Derivation V L) represents a nonterminal that was matched by the grammar. It
+;; contains the label of type L of the production rule that matched, and an immutable vector of
+;; subderivations 
+(struct nonterminal-derivation (label children)
+
+  #:guard
+  (let ([contract-guard (struct-guard/c any/c (sequence/c parser-derivation?))])
+    (λ (label children name)
+      (let-values ([(label children) (contract-guard label children name)])
+        (values label (sequence->vector children)))))
+  
+  #:transparent
+  #:property prop:custom-print-quotable 'never
+  #:methods gen:custom-write
+  [(define write-proc
+     (make-constructor-style-printer
+      (λ (_) 'nonterminal-derivation)
+      (λ (this)
+        (cons (nonterminal-derivation-label this)
+              (vector->list (nonterminal-derivation-children this))))))])
+
+
+(define parser-derivation
+  (case-lambda
+    [(value) (terminal-derivation value)]
+    [(label first-child . children) (nonterminal-derivation label (cons first-child children))]))
+
+
+(define (parser-derivation-first-terminal derivation)
+  (match derivation
+    [(terminal-derivation value) value]
+    [(nonterminal-derivation _ (list first-child _ ...))
+     (parser-derivation-first-terminal first-child)]))
+
+
+(define (parser-derivation-last-terminal derivation)
+  (match derivation
+    [(terminal-derivation value) value]
+    [(nonterminal-derivation _ (list _ ... last-child))
+     (parser-derivation-first-terminal last-child)]))
+
+
+(struct syntax-label (value expression-properties properties)
+  #:transparent
+  #:guard
+  (struct-guard/c any/c
+                  (hash/c any/c any/c #:immutable #true #:flat? #true)
+                  (hash/c any/c any/c #:immutable #true #:flat? #true)))
+
+
+(define (parser-derivation->syntax derivation)
+  (match derivation
+    [(terminal-derivation t) (syntax-token->syntax t)]
+    [(nonterminal-derivation label children)
+     (define first-token (parser-derivation-first-terminal derivation))
+     (define last-token (parser-derivation-last-terminal derivation))
+     (define location
+       (srcloc (syntax-token-source first-token)
+               (syntax-token-line first-token)
+               (syntax-token-column first-token)
+               (syntax-token-position first-token)
+               (- (syntax-token-position first-token) (syntax-token-end-position last-token))))
+     (define label-location
+       (srcloc (syntax-token-source first-token)
+               (syntax-token-line first-token)
+               (syntax-token-column first-token)
+               (syntax-token-position first-token)
+               0))
+     (define label-stx
+       (for/fold ([stx (datum->syntax #false (syntax-label-value label) label-location #false)])
+                 ([(key value) (in-hash (syntax-label-properties label))])
+         (syntax-property stx key value)))
+     (for/fold ([stx (datum->syntax #false (cons label-stx children) location #false)])
+               ([(key value) (in-hash (syntax-label-expression-properties label))])
+       (syntax-property stx key value))]))
--- a/base/token.rkt
+++ b/base/token.rkt
@ -0,0 +1,116 @@
+#lang racket/base
+
+
+(require (for-syntax racket/base
+                     syntax/parse)
+         racket/contract/base
+         racket/match
+         racket/symbol
+         rebellion/private/printer-markup)
+
+
+(provide
+ (struct-out token)
+ (contract-out
+  [syntax-token
+   (->* (any/c #:position exact-positive-integer? #:span exact-nonnegative-integer?)
+        (any/c
+         #:source any/c
+         #:line (or/c exact-positive-integer? #false)
+         #:column (or/c exact-nonnegative-integer? #false)
+         #:skip? boolean?
+         #:properties hash?)
+        syntax-token?)]
+  [syntax-token? predicate/c]
+  [syntax-token-type (-> syntax-token? any/c)]
+  [syntax-token-value (-> syntax-token? any/c)]
+  [syntax-token-location (-> syntax-token? srcloc?)]
+  [syntax-token-skip? (-> syntax-token? boolean?)]
+  [syntax-token-source (-> syntax-token? any/c)]
+  [syntax-token-position (-> syntax-token? exact-positive-integer?)]
+  [syntax-token-span (-> syntax-token? exact-nonnegative-integer?)]
+  [syntax-token-end-position (-> syntax-token? exact-positive-integer?)]
+  [syntax-token-line (-> syntax-token? (or/c exact-positive-integer? #false))]
+  [syntax-token-column (-> syntax-token? (or/c exact-nonnegative-integer? #false))]
+  [syntax-token-properties (-> syntax-token? hash?)]
+  [syntax-token->syntax (-> syntax-token? syntax?)]))
+
+
+;@----------------------------------------------------------------------------------------------------
+
+
+(struct token (type value) #:transparent)
+
+
+(struct syntax-token (type value source position span line column skip? properties)
+  #:constructor-name constructor:token
+  #:transparent
+  #:omit-define-syntaxes
+
+  #:property prop:custom-print-quotable 'never
+
+  #:methods gen:custom-write
+
+  [(define write-proc
+     (make-constructor-style-printer-with-markup
+      'token
+      (λ (this)
+        (append (list (syntax-token-type this))
+                (if (syntax-token-value this) (list (syntax-token-value this)) '())
+                (optional-keyword-argument-markup "#:source" (syntax-token-source this))
+                (optional-keyword-argument-markup "#:position" (syntax-token-position this))
+                (optional-keyword-argument-markup "#:span" (syntax-token-span this))
+                (optional-keyword-argument-markup "#:line" (syntax-token-line this))
+                (optional-keyword-argument-markup "#:column" (syntax-token-column this))
+                (optional-keyword-argument-markup "#:skip?" (syntax-token-skip? this))
+                (optional-keyword-argument-markup "#:properties" (syntax-token-properties this))))))])
+
+
+(define (syntax-token type
+                      [value type]
+                      #:source [source #false]
+                      #:position position
+                      #:span span
+                      #:line [line #false]
+                      #:column [column #false]
+                      #:skip? [skip? #false]
+                      #:properties [properties (hash)])
+  (constructor:token type value source position span line column skip? properties))
+
+
+(define (syntax-token-location token)
+  (srcloc (syntax-token-source token)
+          (syntax-token-line token)
+          (syntax-token-column token)
+          (syntax-token-position token)
+          (syntax-token-span token)))
+
+
+(define (syntax-token->syntax token)
+  (for/fold ([stx (datum->syntax #false (syntax-token-value token) (syntax-token-location token))])
+            ([(key value) (in-hash (syntax-token-properties token))])
+    (syntax-property stx key value)))
+
+
+(define (optional-keyword-argument-markup kw-string value)
+  (if value (list (sequence-markup (list (unquoted-printing-string kw-string) value))) '()))
+
+
+(define (syntax-token-end-position token)
+  (+ (syntax-token-position token) (syntax-token-span token)))
+
+
+#|
+;; yaragg/support
+(struct token-struct (type val offset line column span skip?)
+  #:auto-value #f
+  #:transparent)
+
+;; yaragg/parser-tools/cfg-parser
+(struct tok (name orig-name val start end))
+
+;; yaragg/parser-tools/private-lex/token
+(struct token (name value) #:transparent)
+(struct position-token (token start-pos end-pos) #:inspector #f)
+(struct srcloc-token (token srcloc) #:inspector #f)
+|#
--- a/private/primitive-grammar.rkt
+++ b/private/primitive-grammar.rkt
@ -7,7 +7,9 @@
         racket/stream
         racket/struct
         rebellion/collection/vector
-         rebellion/private/guarded-block)
+         rebellion/private/guarded-block
+         yaragg/base/derivation
+         yaragg/base/token)


 (module+ test
@ -35,11 +37,6 @@
    rule))


-;; A (Token T V) is a tagged value. The grammar rules are defined in terms of the type tag,
-;; whereas the value is what appears in leaf nodes of the resulting parse trees.
-(struct token (type value) #:transparent)
-
-
 ;; A (Context-Free-Production-Rule T S L) contains a nonterminal symbol of type S, a label of type L,
 ;; and a substitution sequence of (Grammar-Symbol T S) values, stored in an immutable vector.
 (struct context-free-production-rule (nonterminal label substitution) #:transparent)
@ -59,38 +56,6 @@
  (context-free-production-rule symbol label (sequence->vector substitution)))


-;; A (Parser-Derivation V L) is either a (Terminal-Derivation V) or a (Nonterminal-Derivation V L)
-(struct parser-derivation () #:transparent)
-
-;; A (Terminal-Derivation V) represents a terminal that was matched by the grammar. It contains the
-;; value of the (Token T V) that was matched.
-(struct terminal-derivation parser-derivation (value) #:transparent)
-
-;; A (Nonterminal-Derivation V L) represents a nonterminal that was matched by the grammar. It
-;; contains the label of type L of the production rule that matched, and an immutable vector of
-;; subderivations 
-(struct nonterminal-derivation parser-derivation (label children)
-  #:transparent
-  #:property prop:custom-print-quotable 'never
-  #:methods gen:custom-write
-  [(define write-proc
-     (make-constructor-style-printer
-      (λ (_) 'nonterminal-derivation)
-      (λ (this)
-        (cons (nonterminal-derivation-label this)
-              (vector->list (nonterminal-derivation-children this))))))])
-
-
-(define (make-nonterminal-derivation label [children '()])
-  (nonterminal-derivation label (sequence->vector children)))
-
-
-(define derivation
-  (case-lambda
-    [(value) (terminal-derivation value)]
-    [(label first-child . children) (make-nonterminal-derivation label (cons first-child children))]))
-
-
 ;; Earley parser


@ -164,7 +129,7 @@
     (define possible-children (possible-children-lists forest key))
     (for*/stream ([children (in-stream possible-children)]
                   [processed-children (in-stream (cartesian-stream (map loop children)))])
-       (make-nonterminal-derivation label processed-children)))))
+       (nonterminal-derivation label processed-children)))))


 (struct earley-state (rule substitution-position input-position key)
@ -330,14 +295,56 @@
      (earley-parse arithmetic-grammar input-tokens))

    (define expected-arithmetic-parse-tree
-      (derivation
+      (parser-derivation
       'P
-       (derivation 'S0
-                   (derivation 'S1 (derivation 'M1 (derivation 'T (derivation 2))))
-                   (derivation 'plus)
-                   (derivation 'M0
-                               (derivation 'M1 (derivation 'T (derivation 3)))
-                               (derivation 'times)
-                               (derivation 'T (derivation 4))))))
+       (parser-derivation 'S0
+                          (parser-derivation 'S1 (parser-derivation 'M1 (parser-derivation 'T (parser-derivation 2))))
+                          (parser-derivation 'plus)
+                          (parser-derivation 'M0
+                                             (parser-derivation 'M1 (parser-derivation 'T (parser-derivation 3)))
+                                             (parser-derivation 'times)
+                                             (parser-derivation 'T (parser-derivation 4))))))
    
    (check-equal? (stream->list arithmetic-parse-forest) (list expected-arithmetic-parse-tree))))
+
+
+(struct cf-syntax-production-rule (nonterminal label substitution properties label-properties)
+  #:transparent)
+
+
+(struct syntax-label (value expression-properties properties) #:transparent)
+
+
+(define (grammar-parse-to-syntax grammar token-sequence)
+  (define tokens
+    (for/vector ([t token-sequence])
+      (token (syntax-token-type t) t)))
+  (for/set ([derivation (in-set (earley-parse tokens))])
+    (derivation->syntax derivation)))
+
+
+(define (derivation->syntax derivation)
+  (match derivation
+    [(terminal-derivation t) (syntax-token->syntax t)]
+    [(nonterminal-derivation label children)
+     (define first-token (parser-derivation-first-terminal derivation))
+     (define last-token (parser-derivation-last-terminal derivation))
+     (define location
+       (srcloc (syntax-token-source first-token)
+               (syntax-token-line first-token)
+               (syntax-token-column first-token)
+               (syntax-token-position first-token)
+               (- (syntax-token-position first-token) (syntax-token-end-position last-token))))
+     (define label-location
+       (srcloc (syntax-token-source first-token)
+               (syntax-token-line first-token)
+               (syntax-token-column first-token)
+               (syntax-token-position first-token)
+               0))
+     (define label-stx
+       (for/fold ([stx (datum->syntax #false (syntax-label-value label) label-location #false)])
+                 ([(key value) (in-hash (syntax-label-properties label))])
+         (syntax-property stx key value)))
+     (for/fold ([stx (datum->syntax #false (cons label-stx children) location #false)])
+               ([(key value) (in-hash (syntax-label-expression-properties label))])
+       (syntax-property stx key value))]))
--- a/token.rkt
+++ b/token.rkt
@ -1,128 +0,0 @@
-#lang racket/base
-
-
-(require (for-syntax racket/base
-                     syntax/parse)
-         racket/contract/base
-         racket/match
-         racket/symbol
-         rebellion/private/printer-markup)
-
-
-(provide
- token
- (contract-out
-  [token? predicate/c]
-  [token-type (-> token? (and/c symbol? symbol-interned?))]
-  [token-value (-> token? any/c)]
-  [token-location (-> token? (or/c srcloc? #false))]
-  [token-skip? (-> token? boolean?)]
-  [source-location
-   (->* ()
-        (#:source any/c
-         #:position (or/c exact-positive-integer? #false)
-         #:line (or/c exact-positive-integer? #false)
-         #:column (or/c exact-nonnegative-integer? #false)
-         #:span (or/c exact-nonnegative-integer? #false))
-        srcloc?)]
-  [token-position (-> token? (or/c exact-positive-integer? #false))]
-  [token-end-position (-> token? (or/c exact-positive-integer? #false))]))
-
-
-;@----------------------------------------------------------------------------------------------------
-
-
-(struct token (type value location skip?)
-  #:constructor-name constructor:token
-  #:transparent
-  #:omit-define-syntaxes
-
-  #:property prop:custom-print-quotable 'never
-
-  #:methods gen:custom-write
-
-  [(define write-proc
-     (make-constructor-style-printer-with-markup
-      'token
-      (λ (this)
-        (append (list (token-type this))
-                (if (token-value this) (list (token-value this)) '())
-                (if (token-location this)
-                    (list
-                     (sequence-markup
-                      (list (unquoted-printing-string "#:location") (token-location this))))
-                    '())
-                (if (token-skip? this)
-                    (list
-                     (sequence-markup (list (unquoted-printing-string "#:skip?") (token-skip? this))))
-                    '())))))])
-
-
-(define (source-location #:source [source #false]
-                         #:position [position #false]
-                         #:span [span #false]
-                         #:line [line #false]
-                         #:column [column #false])
-  (srcloc source line column position span))
-
-
-(define (unchecked:token type
-                         [value #false]
-                         #:location [location #false]
-                         #:skip? [skip? #false])
-  (let ([type
-         (cond [(string? type) (string->symbol type)]
-               [(not (symbol-interned? type)) (string->symbol (symbol->immutable-string type))]
-               [else type])])
-    (constructor:token type value location skip?)))
-
-
-(define-module-boundary-contract contracted:token unchecked:token
-  (->* ((or/c symbol? string?)) (any/c #:location (or/c srcloc? #false) #:skip? boolean?)
-       token?)
-  #:name-for-blame token)
-
-
-(define-match-expander token
-  (syntax-parser
-    [(_
-      (~alt
-       (~once value-pattern:expr)
-       (~optional (~seq #:type type-pattern:expr) #:defaults ([type-pattern #'_]))
-       (~optional (~seq #:location location-pattern:expr) #:defaults ([location-pattern #'_]))
-       (~optional (~seq #:skip? skip-pattern:expr) #:defaults ([skip-pattern #'_])))
-      ...)
-     #'(? token?
-          (app token-value value-pattern)
-          (app token-type type-pattern)
-          (app token-location location-pattern)
-          (app token-skip? skip-pattern))])
-  (make-rename-transformer #'contracted:token))
-
-
-(define (token-position t)
-  (define loc (token-location t))
-  (and loc (srcloc-position loc)))
-
-
-(define (token-end-position t)
-  (define loc (token-location t))
-  (define start (and loc (srcloc-position loc)))
-  (define span (and loc (srcloc-span loc)))
-  (and start span (+ start span)))
-
-
-#|
-;; yaragg/support
-(struct token-struct (type val offset line column span skip?)
-  #:auto-value #f
-  #:transparent)
-
-;; yaragg/parser-tools/cfg-parser
-(struct tok (name orig-name val start end))
-
-;; yaragg/parser-tools/private-lex/token
-(struct token (name value) #:transparent)
-(struct position-token (token start-pos end-pos) #:inspector #f)
-(struct srcloc-token (token srcloc) #:inspector #f)
-|#