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73 lines
3.3 KiB
Racket
73 lines
3.3 KiB
Racket
#lang racket/base
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(require xml txexpr sugar/define)
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(require "predicates.rkt" "decode/typography.rkt" "debug.rkt")
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(provide (all-from-out "decode/typography.rkt"))
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(define+provide (to-string x)
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(if (string? x)
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x ; fast exit for strings
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(with-handlers ([exn:fail? (λ(exn) (error (format "Pollen parser: can't convert ~v to ~a" x 'string)))])
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(cond
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[(equal? '() x) ""]
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[(symbol? x) (symbol->string x)]
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[(number? x) (number->string x)]
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[(path? x) (path->string x)]
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[(char? x) (format "~a" x)]
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[else (error)])))) ; put this last so other xexprish things don't get caught
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;; add a block tag to the list
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(define+provide/contract (register-block-tag tag)
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(symbol? . -> . void?)
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(append-block-tag tag))
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;; decoder wireframe
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(define+provide/contract (decode txexpr
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#:exclude-xexpr-tags [excluded-xexpr-tags '()]
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#:xexpr-tag-proc [xexpr-tag-proc (λ(x)x)]
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#:xexpr-attrs-proc [xexpr-attrs-proc (λ(x)x)]
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#:xexpr-elements-proc [xexpr-elements-proc (λ(x)x)]
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#:block-xexpr-proc [block-xexpr-proc (λ(x)x)]
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#:inline-xexpr-proc [inline-xexpr-proc (λ(x)x)]
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#:string-proc [string-proc (λ(x)x)]
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#:symbol-proc [symbol-proc (λ(x)x)]
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#:valid-char-proc [valid-char-proc (λ(x)x)]
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#:cdata-proc [cdata-proc (λ(x)x)])
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((xexpr/c)
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(#:exclude-xexpr-tags list?
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#:xexpr-tag-proc procedure?
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#:xexpr-attrs-proc procedure?
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#:xexpr-elements-proc procedure?
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#:block-xexpr-proc procedure?
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#:inline-xexpr-proc procedure?
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#:string-proc procedure?
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#:symbol-proc procedure?
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#:valid-char-proc procedure?
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#:cdata-proc procedure?) . ->* . txexpr?)
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(let loop ([x txexpr])
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(cond
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[(txexpr? x) (let-values([(tag attrs elements) (txexpr->values x)])
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(if (member tag excluded-xexpr-tags)
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x ; because it's excluded
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;; we apply processing here rather than do recursive descent on the pieces
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;; because if we send them back through loop, certain element types are ambiguous
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;; e.g., ((p "foo")) tests out as both txexpr-attrs and txexpr-elements
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(let ([decoded-xexpr
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(apply make-txexpr (list (xexpr-tag-proc tag)
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(xexpr-attrs-proc attrs)
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(map loop (xexpr-elements-proc elements))))])
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((if (block-xexpr? decoded-xexpr)
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block-xexpr-proc
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inline-xexpr-proc) decoded-xexpr))))]
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[(string? x) (string-proc x)]
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[(symbol? x) (symbol-proc x)]
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[(valid-char? x) (valid-char-proc x)]
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[(cdata? x) (cdata-proc x)]
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[else (error "decode: can't decode" x)])))
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