giles
b23e81730c
Extends router.sx with the full SX URL algebra — structural navigation (.slug, .., ...), keyword set/delta (.:page.4, .:page.+1), bare-dot shorthand, and ! special form parsing (!source, !inspect, !diff, !search, !raw, !json). All pure SX spec, bootstrapped to both Python and JS. Fixes: index-of -1/nil portability (_index-of-safe wrapper), variadic (+ a b c) transpilation bug (use nested binary +). Includes 115 passing tests covering all operations. Also: "The" strapline and essay title. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
581 lines
24 KiB
Plaintext
581 lines
24 KiB
Plaintext
;; ==========================================================================
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;; router.sx — Client-side route matching specification
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;;
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;; Pure functions for matching URL paths against Flask-style route patterns.
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;; Used by client-side routing to determine if a page can be rendered
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;; locally without a server roundtrip.
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;;
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;; All functions are pure — no IO, no platform-specific operations.
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;; Uses only primitives from primitives.sx (string ops, list ops).
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;; ==========================================================================
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;; --------------------------------------------------------------------------
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;; 1. Split path into segments
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;; --------------------------------------------------------------------------
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;; "/docs/hello" → ("docs" "hello")
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;; "/" → ()
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;; "/docs/" → ("docs")
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(define split-path-segments :effects []
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(fn ((path :as string))
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(let ((trimmed (if (starts-with? path "/") (slice path 1) path)))
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(let ((trimmed2 (if (and (not (empty? trimmed))
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(ends-with? trimmed "/"))
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(slice trimmed 0 (- (len trimmed) 1))
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trimmed)))
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(if (empty? trimmed2)
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(list)
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(split trimmed2 "/"))))))
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;; --------------------------------------------------------------------------
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;; 2. Parse Flask-style route pattern into segment descriptors
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;; --------------------------------------------------------------------------
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;; "/docs/<slug>" → ({"type" "literal" "value" "docs"}
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;; {"type" "param" "value" "slug"})
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(define make-route-segment :effects []
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(fn ((seg :as string))
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(if (and (starts-with? seg "<") (ends-with? seg ">"))
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(let ((param-name (slice seg 1 (- (len seg) 1))))
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(let ((d {}))
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(dict-set! d "type" "param")
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(dict-set! d "value" param-name)
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d))
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(let ((d {}))
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(dict-set! d "type" "literal")
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(dict-set! d "value" seg)
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d))))
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(define parse-route-pattern :effects []
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(fn ((pattern :as string))
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(let ((segments (split-path-segments pattern)))
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(map make-route-segment segments))))
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;; --------------------------------------------------------------------------
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;; 3. Match path segments against parsed pattern
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;; --------------------------------------------------------------------------
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;; Returns params dict if match, nil if no match.
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(define match-route-segments :effects []
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(fn ((path-segs :as list) (parsed-segs :as list))
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(if (not (= (len path-segs) (len parsed-segs)))
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nil
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(let ((params {})
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(matched true))
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(for-each-indexed
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(fn ((i :as number) (parsed-seg :as dict))
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(when matched
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(let ((path-seg (nth path-segs i))
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(seg-type (get parsed-seg "type")))
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(cond
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(= seg-type "literal")
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(when (not (= path-seg (get parsed-seg "value")))
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(set! matched false))
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(= seg-type "param")
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(dict-set! params (get parsed-seg "value") path-seg)
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:else
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(set! matched false)))))
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parsed-segs)
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(if matched params nil)))))
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;; --------------------------------------------------------------------------
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;; 4. Public API: match a URL path against a pattern string
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;; --------------------------------------------------------------------------
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;; Returns params dict (may be empty for exact matches) or nil.
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(define match-route :effects []
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(fn ((path :as string) (pattern :as string))
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(let ((path-segs (split-path-segments path))
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(parsed-segs (parse-route-pattern pattern)))
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(match-route-segments path-segs parsed-segs))))
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;; --------------------------------------------------------------------------
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;; 5. Search a list of route entries for first match
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;; --------------------------------------------------------------------------
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;; Each entry: {"pattern" "/docs/<slug>" "parsed" [...] "name" "docs-page" ...}
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;; Returns matching entry with "params" added, or nil.
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(define find-matching-route :effects []
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(fn ((path :as string) (routes :as list))
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;; If path is an SX expression URL, convert to old-style for matching.
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(let ((match-path (if (starts-with? path "/(")
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(or (sx-url-to-path path) path)
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path)))
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(let ((path-segs (split-path-segments match-path))
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(result nil))
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(for-each
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(fn ((route :as dict))
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(when (nil? result)
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(let ((params (match-route-segments path-segs (get route "parsed"))))
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(when (not (nil? params))
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(let ((matched (merge route {})))
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(dict-set! matched "params" params)
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(set! result matched))))))
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routes)
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result))))
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;; --------------------------------------------------------------------------
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;; 6. SX expression URL → old-style path conversion
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;; --------------------------------------------------------------------------
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;; Converts /(language.(doc.introduction)) → /language/docs/introduction
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;; so client-side routing can match SX URLs against Flask-style patterns.
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(define _fn-to-segment :effects []
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(fn ((name :as string))
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(case name
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"doc" "docs"
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"spec" "specs"
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"bootstrapper" "bootstrappers"
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"test" "testing"
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"example" "examples"
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"protocol" "protocols"
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"essay" "essays"
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"plan" "plans"
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"reference-detail" "reference"
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:else name)))
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(define sx-url-to-path :effects []
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(fn ((url :as string))
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;; Convert an SX expression URL to an old-style slash path.
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;; "/(language.(doc.introduction))" → "/language/docs/introduction"
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;; Returns nil for non-SX URLs (those not starting with "/(" ).
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(if (not (and (starts-with? url "/(") (ends-with? url ")")))
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nil
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(let ((inner (slice url 2 (- (len url) 1))))
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;; "language.(doc.introduction)" → dots to slashes, strip parens
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(let ((s (replace (replace (replace inner "." "/") "(" "") ")" "")))
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;; "language/doc/introduction" → split, map names, rejoin
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(let ((segs (filter (fn (s) (not (empty? s))) (split s "/"))))
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(str "/" (join "/" (map _fn-to-segment segs)))))))))
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;; --------------------------------------------------------------------------
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;; 7. Relative SX URL resolution
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;; --------------------------------------------------------------------------
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;; Resolves relative SX URLs against the current absolute URL.
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;; This is a macro in the deepest sense: SX transforming SX into SX.
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;; The URL is code. Relative resolution is code transformation.
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;;
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;; Relative URLs start with ( or . :
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;; (.slug) → append slug as argument to innermost call
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;; (..section) → up 1: replace innermost with new nested call
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;; (...section) → up 2: replace 2 innermost levels
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;;
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;; Bare-dot shorthand (parens optional):
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;; .slug → same as (.slug)
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;; .. → same as (..) — go up one level
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;; ... → same as (...) — go up two levels
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;; .:page.4 → same as (.:page.4) — set keyword
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;;
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;; Dot count semantics (parallels filesystem . and ..):
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;; 1 dot = current level (append argument / modify keyword)
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;; 2 dots = up 1 level (sibling call)
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;; 3 dots = up 2 levels
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;; N dots = up N-1 levels
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;;
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;; Keyword operations (set, delta):
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;; (.:page.4) → set :page to 4 at current level
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;; (.:page.+1) → increment :page by 1 (delta)
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;; (.:page.-1) → decrement :page by 1 (delta)
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;; (.slug.:page.1) → append slug AND set :page=1
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;;
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;; Examples (current = "/(geography.(hypermedia.(example)))"):
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;; (.progress-bar) → /(geography.(hypermedia.(example.progress-bar)))
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;; (..reactive.demo) → /(geography.(hypermedia.(reactive.demo)))
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;; (...marshes) → /(geography.(marshes))
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;; (..) → /(geography.(hypermedia))
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;; (...) → /(geography)
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;;
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;; Keyword examples (current = "/(language.(spec.(explore.signals.:page.3)))"):
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;; (.:page.4) → /(language.(spec.(explore.signals.:page.4)))
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;; (.:page.+1) → /(language.(spec.(explore.signals.:page.4)))
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;; (.:page.-1) → /(language.(spec.(explore.signals.:page.2)))
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;; (..eval) → /(language.(spec.(eval)))
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;; (..eval.:page.1) → /(language.(spec.(eval.:page.1)))
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(define _count-leading-dots :effects []
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(fn ((s :as string))
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(if (empty? s)
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0
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(if (starts-with? s ".")
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(+ 1 (_count-leading-dots (slice s 1)))
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0))))
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(define _strip-trailing-close :effects []
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(fn ((s :as string))
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;; Strip trailing ) characters: "/(a.(b.(c" from "/(a.(b.(c)))"
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(if (ends-with? s ")")
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(_strip-trailing-close (slice s 0 (- (len s) 1)))
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s)))
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(define _index-of-safe :effects []
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(fn ((s :as string) (needle :as string))
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;; Wrapper around index-of that normalizes -1 to nil.
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;; (index-of returns -1 on some platforms, nil on others.)
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(let ((idx (index-of s needle)))
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(if (or (nil? idx) (< idx 0)) nil idx))))
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(define _last-index-of :effects []
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(fn ((s :as string) (needle :as string))
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;; Find the last occurrence of needle in s. Returns nil if not found.
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(let ((idx (_index-of-safe s needle)))
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(if (nil? idx)
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nil
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(let ((rest-idx (_last-index-of (slice s (+ idx 1)) needle)))
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(if (nil? rest-idx)
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idx
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(+ (+ idx 1) rest-idx)))))))
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(define _pop-sx-url-level :effects []
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(fn ((url :as string))
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;; Remove the innermost nesting level from an absolute SX URL.
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;; "/(a.(b.(c)))" → "/(a.(b))"
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;; "/(a.(b))" → "/(a)"
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;; "/(a)" → "/"
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(let ((stripped (_strip-trailing-close url))
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(close-count (- (len url) (len (_strip-trailing-close url)))))
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(if (<= close-count 1)
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"/" ;; at root, popping goes to bare root
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(let ((last-dp (_last-index-of stripped ".(")))
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(if (nil? last-dp)
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"/" ;; single-level URL, pop to root
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;; Remove from .( to end of stripped, drop one closing paren
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(str (slice stripped 0 last-dp)
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(slice url (- (len url) (- close-count 1))))))))))
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(define _pop-sx-url-levels :effects []
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(fn ((url :as string) (n :as number))
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(if (<= n 0)
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url
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(_pop-sx-url-levels (_pop-sx-url-level url) (- n 1)))))
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;; --------------------------------------------------------------------------
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;; 8. Relative URL body parsing — positional vs keyword tokens
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;; --------------------------------------------------------------------------
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;; Body "slug.:page.4" → positional "slug", keywords ((:page 4))
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;; Body ":page.+1" → positional "", keywords ((:page +1))
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(define _split-pos-kw :effects []
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(fn ((tokens :as list) (i :as number) (pos :as list) (kw :as list))
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;; Walk tokens: non-: tokens are positional, : tokens consume next as value
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(if (>= i (len tokens))
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{"positional" (join "." pos) "keywords" kw}
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(let ((tok (nth tokens i)))
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(if (starts-with? tok ":")
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;; Keyword: take this + next token as a pair
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(let ((val (if (< (+ i 1) (len tokens))
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(nth tokens (+ i 1))
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"")))
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(_split-pos-kw tokens (+ i 2) pos
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(append kw (list (list tok val)))))
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;; Positional token
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(_split-pos-kw tokens (+ i 1)
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(append pos (list tok))
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kw))))))
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(define _parse-relative-body :effects []
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(fn ((body :as string))
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;; Returns {"positional" <string> "keywords" <list of (kw val) pairs>}
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(if (empty? body)
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{"positional" "" "keywords" (list)}
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(_split-pos-kw (split body ".") 0 (list) (list)))))
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;; --------------------------------------------------------------------------
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;; 9. Keyword operations on URL expressions
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;; --------------------------------------------------------------------------
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;; Extract, find, and modify keyword arguments in the innermost expression.
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(define _extract-innermost :effects []
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(fn ((url :as string))
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;; Returns {"before" ... "content" ... "suffix" ...}
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;; where before + content + suffix = url
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;; content = the innermost expression's dot-separated tokens
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(let ((stripped (_strip-trailing-close url))
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(suffix (slice url (len (_strip-trailing-close url)))))
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(let ((last-dp (_last-index-of stripped ".(")))
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(if (nil? last-dp)
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;; Single-level: /(content)
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{"before" "/("
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"content" (slice stripped 2)
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"suffix" suffix}
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;; Multi-level: .../.(content)...)
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{"before" (slice stripped 0 (+ last-dp 2))
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"content" (slice stripped (+ last-dp 2))
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"suffix" suffix})))))
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(define _find-kw-in-tokens :effects []
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(fn ((tokens :as list) (i :as number) (kw :as string))
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;; Find value of keyword kw in token list. Returns nil if not found.
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(if (>= i (len tokens))
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nil
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(if (and (= (nth tokens i) kw)
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(< (+ i 1) (len tokens)))
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(nth tokens (+ i 1))
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(_find-kw-in-tokens tokens (+ i 1) kw)))))
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(define _find-keyword-value :effects []
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(fn ((content :as string) (kw :as string))
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;; Find keyword's value in dot-separated content string.
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;; "explore.signals.:page.3" ":page" → "3"
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(_find-kw-in-tokens (split content ".") 0 kw)))
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(define _replace-kw-in-tokens :effects []
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(fn ((tokens :as list) (i :as number) (kw :as string) (value :as string))
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;; Replace keyword's value in token list. Returns new token list.
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(if (>= i (len tokens))
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(list)
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(if (and (= (nth tokens i) kw)
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(< (+ i 1) (len tokens)))
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;; Found — keep keyword, replace value, concat rest
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(append (list kw value)
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(_replace-kw-in-tokens tokens (+ i 2) kw value))
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;; Not this keyword — keep token, continue
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(cons (nth tokens i)
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(_replace-kw-in-tokens tokens (+ i 1) kw value))))))
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(define _set-keyword-in-content :effects []
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(fn ((content :as string) (kw :as string) (value :as string))
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;; Set or replace keyword value in dot-separated content.
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;; "a.b.:page.3" ":page" "4" → "a.b.:page.4"
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;; "a.b" ":page" "1" → "a.b.:page.1"
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(let ((current (_find-keyword-value content kw)))
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(if (nil? current)
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;; Not found — append
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(str content "." kw "." value)
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;; Found — replace
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(join "." (_replace-kw-in-tokens (split content ".") 0 kw value))))))
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(define _is-delta-value? :effects []
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(fn ((s :as string))
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;; "+1", "-2", "+10" are deltas. "-" alone is not.
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(and (not (empty? s))
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(> (len s) 1)
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(or (starts-with? s "+") (starts-with? s "-")))))
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(define _apply-delta :effects []
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(fn ((current-str :as string) (delta-str :as string))
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;; Apply numeric delta to current value string.
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;; "3" "+1" → "4", "3" "-1" → "2"
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(let ((cur (parse-int current-str nil))
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(delta (parse-int delta-str nil)))
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(if (or (nil? cur) (nil? delta))
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delta-str ;; fallback: use delta as literal value
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(str (+ cur delta))))))
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(define _apply-kw-pairs :effects []
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(fn ((content :as string) (kw-pairs :as list))
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;; Apply keyword modifications to content, one at a time.
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(if (empty? kw-pairs)
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content
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(let ((pair (first kw-pairs))
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(kw (first pair))
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(raw-val (nth pair 1)))
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(let ((actual-val
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(if (_is-delta-value? raw-val)
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(let ((current (_find-keyword-value content kw)))
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(if (nil? current)
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raw-val ;; no current value, treat delta as literal
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(_apply-delta current raw-val)))
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raw-val)))
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(_apply-kw-pairs
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(_set-keyword-in-content content kw actual-val)
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(rest kw-pairs)))))))
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(define _apply-keywords-to-url :effects []
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(fn ((url :as string) (kw-pairs :as list))
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;; Apply keyword modifications to the innermost expression of a URL.
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(if (empty? kw-pairs)
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url
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(let ((parts (_extract-innermost url)))
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(let ((new-content (_apply-kw-pairs (get parts "content") kw-pairs)))
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(str (get parts "before") new-content (get parts "suffix")))))))
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;; --------------------------------------------------------------------------
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;; 10. Public API: resolve-relative-url (structural + keywords)
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;; --------------------------------------------------------------------------
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(define _normalize-relative :effects []
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(fn ((url :as string))
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;; Normalize bare-dot shorthand to paren form.
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;; ".." → "(..)"
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;; ".slug" → "(.slug)"
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;; ".:page.4" → "(.:page.4)"
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;; "(.slug)" → "(.slug)" (already canonical)
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(if (starts-with? url "(")
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url
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(str "(" url ")"))))
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(define resolve-relative-url :effects []
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(fn ((current :as string) (relative :as string))
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;; current: absolute SX URL "/(geography.(hypermedia.(example)))"
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;; relative: relative SX URL "(.progress-bar)" or ".." or ".:page.+1"
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;; Returns: absolute SX URL
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(let ((canonical (_normalize-relative relative)))
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(let ((rel-inner (slice canonical 1 (- (len canonical) 1))))
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(let ((dots (_count-leading-dots rel-inner))
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(body (slice rel-inner (_count-leading-dots rel-inner))))
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(if (= dots 0)
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current ;; no dots — not a relative URL
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;; Parse body into positional part + keyword pairs
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(let ((parsed (_parse-relative-body body))
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(pos-body (get parsed "positional"))
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(kw-pairs (get parsed "keywords")))
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;; Step 1: structural navigation
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(let ((after-nav
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(if (= dots 1)
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;; One dot = current level
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(if (empty? pos-body)
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current ;; no positional → stay here (keyword-only)
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;; Append positional part at current level
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(let ((stripped (_strip-trailing-close current))
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(suffix (slice current (len (_strip-trailing-close current)))))
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(str stripped "." pos-body suffix)))
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;; Two+ dots = pop (dots-1) levels
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(let ((base (_pop-sx-url-levels current (- dots 1))))
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(if (empty? pos-body)
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base ;; no positional → just pop (cd ..)
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(if (= base "/")
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(str "/(" pos-body ")")
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(let ((stripped (_strip-trailing-close base))
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(suffix (slice base (len (_strip-trailing-close base)))))
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(str stripped ".(" pos-body ")" suffix))))))))
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|
;; Step 2: apply keyword modifications
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(_apply-keywords-to-url after-nav kw-pairs)))))))))
|
|
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|
;; Check if a URL is relative (starts with ( but not /( , or starts with .)
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|
(define relative-sx-url? :effects []
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|
(fn ((url :as string))
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|
(or (and (starts-with? url "(")
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|
(not (starts-with? url "/(")))
|
|
(starts-with? url "."))))
|
|
|
|
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|
;; --------------------------------------------------------------------------
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|
;; 11. URL special forms (! prefix)
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|
;; --------------------------------------------------------------------------
|
|
;; Special forms are meta-operations on URL expressions.
|
|
;; Distinguished by `!` prefix to avoid name collisions with sections/pages.
|
|
;;
|
|
;; Known forms:
|
|
;; !source — show defcomp source code
|
|
;; !inspect — deps, CSS footprint, render plan, IO
|
|
;; !diff — side-by-side comparison of two expressions
|
|
;; !search — grep within a page/spec
|
|
;; !raw — skip ~sx-doc wrapping, return raw content
|
|
;; !json — return content as JSON data
|
|
;;
|
|
;; URL examples:
|
|
;; /(!source.(~essay-sx-sucks))
|
|
;; /(!inspect.(language.(doc.primitives)))
|
|
;; /(!diff.(language.(spec.signals)).(language.(spec.eval)))
|
|
;; /(!search."define".:in.(language.(spec.signals)))
|
|
;; /(!raw.(~some-component))
|
|
;; /(!json.(language.(doc.primitives)))
|
|
|
|
(define _url-special-forms :effects []
|
|
(fn ()
|
|
;; Returns the set of known URL special form names.
|
|
(list "!source" "!inspect" "!diff" "!search" "!raw" "!json")))
|
|
|
|
(define url-special-form? :effects []
|
|
(fn ((name :as string))
|
|
;; Check if a name is a URL special form (starts with ! and is known).
|
|
(and (starts-with? name "!")
|
|
(contains? (_url-special-forms) name))))
|
|
|
|
(define parse-sx-url :effects []
|
|
(fn ((url :as string))
|
|
;; Parse an SX URL into a structured descriptor.
|
|
;; Returns a dict with:
|
|
;; "type" — "home" | "absolute" | "relative" | "special-form" | "direct-component"
|
|
;; "form" — special form name (for special-form type), e.g. "!source"
|
|
;; "inner" — inner URL expression string (without the special form wrapper)
|
|
;; "raw" — original URL string
|
|
;;
|
|
;; Examples:
|
|
;; "/" → {"type" "home" "raw" "/"}
|
|
;; "/(language.(doc.intro))" → {"type" "absolute" "raw" ...}
|
|
;; "(.slug)" → {"type" "relative" "raw" ...}
|
|
;; "..slug" → {"type" "relative" "raw" ...}
|
|
;; "/(!source.(~essay))" → {"type" "special-form" "form" "!source" "inner" "(~essay)" "raw" ...}
|
|
;; "/(~essay-sx-sucks)" → {"type" "direct-component" "name" "~essay-sx-sucks" "raw" ...}
|
|
(cond
|
|
(= url "/")
|
|
{"type" "home" "raw" url}
|
|
(relative-sx-url? url)
|
|
{"type" "relative" "raw" url}
|
|
(and (starts-with? url "/(!")
|
|
(ends-with? url ")"))
|
|
;; Special form: /(!source.(~essay)) or /(!diff.a.b)
|
|
;; Extract the form name (first dot-separated token after /()
|
|
(let ((inner (slice url 2 (- (len url) 1))))
|
|
;; inner = "!source.(~essay)" or "!diff.(a).(b)"
|
|
(let ((dot-pos (_index-of-safe inner "."))
|
|
(paren-pos (_index-of-safe inner "(")))
|
|
;; Form name ends at first . or ( (whichever comes first)
|
|
(let ((end-pos (cond
|
|
(and (nil? dot-pos) (nil? paren-pos)) (len inner)
|
|
(nil? dot-pos) paren-pos
|
|
(nil? paren-pos) dot-pos
|
|
:else (min dot-pos paren-pos))))
|
|
(let ((form-name (slice inner 0 end-pos))
|
|
(rest-part (slice inner end-pos)))
|
|
;; rest-part starts with "." → strip leading dot
|
|
(let ((inner-expr (if (starts-with? rest-part ".")
|
|
(slice rest-part 1)
|
|
rest-part)))
|
|
{"type" "special-form"
|
|
"form" form-name
|
|
"inner" inner-expr
|
|
"raw" url})))))
|
|
(and (starts-with? url "/(~")
|
|
(ends-with? url ")"))
|
|
;; Direct component: /(~essay-sx-sucks)
|
|
(let ((name (slice url 2 (- (len url) 1))))
|
|
{"type" "direct-component" "name" name "raw" url})
|
|
(and (starts-with? url "/(")
|
|
(ends-with? url ")"))
|
|
{"type" "absolute" "raw" url}
|
|
:else
|
|
{"type" "path" "raw" url})))
|
|
|
|
(define url-special-form-name :effects []
|
|
(fn ((url :as string))
|
|
;; Extract the special form name from a URL, or nil if not a special form.
|
|
;; "/(!source.(~essay))" → "!source"
|
|
;; "/(language.(doc))" → nil
|
|
(let ((parsed (parse-sx-url url)))
|
|
(if (= (get parsed "type") "special-form")
|
|
(get parsed "form")
|
|
nil))))
|
|
|
|
(define url-special-form-inner :effects []
|
|
(fn ((url :as string))
|
|
;; Extract the inner expression from a special form URL, or nil.
|
|
;; "/(!source.(~essay))" → "(~essay)"
|
|
;; "/(!diff.(a).(b))" → "(a).(b)"
|
|
(let ((parsed (parse-sx-url url)))
|
|
(if (= (get parsed "type") "special-form")
|
|
(get parsed "inner")
|
|
nil))))
|
|
|
|
|
|
;; --------------------------------------------------------------------------
|
|
;; Platform interface — none required
|
|
;; --------------------------------------------------------------------------
|
|
;; All functions use only pure primitives:
|
|
;; split, slice, starts-with?, ends-with?, len, empty?, replace,
|
|
;; map, filter, for-each, for-each-indexed, nth, get, dict-set!, merge,
|
|
;; list, nil?, not, =, case, join, str, index-of, and, or, cons,
|
|
;; first, rest, append, parse-int, contains?, min, cond
|
|
;; --------------------------------------------------------------------------
|