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pollen/reader-base.rkt

91 lines
5.7 KiB
Racket

#lang racket/base
(require racket/syntax syntax/strip-context racket/class)
(require (only-in scribble/reader make-at-reader) pollen/world pollen/project racket/list)
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(provide define+provide-reader-in-mode (all-from-out pollen/world))
(define (make-custom-read custom-read-syntax-proc)
(λ(p) (syntax->datum (custom-read-syntax-proc (object-name p) p))))
(define (make-custom-read-syntax reader-mode)
(λ (path-string p)
(define read-inner (make-at-reader
#:command-char (if (or (eq? reader-mode world:mode-template)
(and (string? path-string)
(regexp-match (pregexp (format "\\.~a$" (world:current-template-source-ext))) path-string)))
(world:current-template-command-char)
(world:current-command-char))
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#:syntax? #t
#:inside? #t))
(define source-stx (read-inner path-string p))
(define reader-here-path (cond
[(symbol? path-string) (symbol->string path-string)]
[(equal? path-string "unsaved editor") path-string]
[else (path->string path-string)]))
(define parser-mode (if (eq? reader-mode world:mode-auto)
(let* ([file-ext-pattern (pregexp "\\w+$")]
[here-ext (string->symbol (car (regexp-match file-ext-pattern reader-here-path)))]
[auto-computed-mode (cond
[(eq? here-ext (world:current-pagetree-source-ext)) world:mode-pagetree]
[(eq? here-ext (world:current-markup-source-ext)) world:mode-markup]
[(eq? here-ext (world:current-markdown-source-ext)) world:mode-markdown]
[else world:mode-preproc])])
auto-computed-mode)
reader-mode))
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(define post-parser-syntax
(with-syntax ([HERE-KEY (format-id source-stx "~a" (world:current-here-path-key))]
[HERE-PATH (datum->syntax source-stx reader-here-path)]
[POLLEN-MOD (format-symbol "~a" (gensym))] ; prevents conflicts with other imported Pollen sources
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[PARSER-MODE-VALUE (format-symbol "~a" parser-mode)]
[DIRECTORY-REQUIRES (datum->syntax source-stx (require+provide-directory-require-files path-string))]
[(SOURCE-LINE ...) source-stx]
[DOC (format-id source-stx "~a" (world:current-main-export))])
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(replace-context
source-stx
#'(module runtime-wrapper racket/base
(module POLLEN-MOD pollen
(define-meta HERE-KEY HERE-PATH)
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(define parser-mode 'PARSER-MODE-VALUE)
(provide (except-out (all-defined-out) parser-mode)
(prefix-out inner: parser-mode)) ; avoids conflicts with importing modules
DIRECTORY-REQUIRES
SOURCE-LINE ...)
(require (submod pollen/runtime-config show) 'POLLEN-MOD)
(provide (all-from-out 'POLLEN-MOD))
(show DOC inner:parser-mode HERE-PATH))))) ; HERE-PATH acts as "local" runtime config
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(syntax-property post-parser-syntax
'module-language
`#(pollen/language-info get-language-info ,reader-here-path)))) ; reader-here-path acts as "top" runtime config
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(define-syntax-rule (define+provide-reader-in-mode mode)
(begin
(define reader-mode mode)
(define custom-read-syntax (make-custom-read-syntax reader-mode))
(define custom-read (make-custom-read custom-read-syntax))
(define (get-info in mod line col pos)
;; DrRacket caches source file information per session,
;; so we can do the same to avoid multiple searches for the command char.
(let ([command-char-cache (make-hash)])
(λ (key default)
(case key
[(color-lexer drracket:toolbar-buttons) ; only do source-path searching if we have one of these keys
(define maybe-source-path (with-handlers ([exn:fail? (λ(exn) #f)])
;; Robert Findler does not endorse `get-filename` here,
;; because it's sneaky and may not always work.
;; OTOH Scribble relies on it, so IMO it's highly unlikely to change.
(let ([maybe-definitions-frame (object-name in)])
(send maybe-definitions-frame get-filename)))) ; will be #f if unsaved file
(define my-command-char (hash-ref! command-char-cache maybe-source-path (λ _ (world:current-command-char maybe-source-path))))
(case key
[(color-lexer)
(define my-make-scribble-inside-lexer
(dynamic-require 'syntax-color/scribble-lexer 'make-scribble-inside-lexer (λ () #f)))
(cond [my-make-scribble-inside-lexer
(my-make-scribble-inside-lexer #:command-char my-command-char)]
[else default])]
[(drracket:toolbar-buttons)
(define my-make-drracket-buttons (dynamic-require 'pollen/drracket-buttons 'make-drracket-buttons))
(my-make-drracket-buttons my-command-char)])]
[else default]))))
(provide (rename-out [custom-read read] [custom-read-syntax read-syntax]) get-info)))