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authorDavid Thompson <dthompson2@worcester.edu>2015-10-18 20:54:01 -0400
committerDavid Thompson <dthompson2@worcester.edu>2015-10-18 21:48:01 -0400
commit262d63e1ba57025b26de7166cb64e8d225f14893 (patch)
tree5055e8b1478eb611a1b2eaa4c86e5bab4c6469ba /syntax-highlight
parent73698a36131dd58d11becd89a71443100923d717 (diff)
scheme: Tag symbols beginning with "define" as special.
* syntax-highlight/scheme.scm (parse-symbol-chars, parse-specials/regexp): New procedures. (parse-keyword): Use 'parse-symbol-chars'.
Diffstat (limited to 'syntax-highlight')
-rw-r--r--syntax-highlight/scheme.scm37
1 files changed, 33 insertions, 4 deletions
diff --git a/syntax-highlight/scheme.scm b/syntax-highlight/scheme.scm
index 81673cb..78f2150 100644
--- a/syntax-highlight/scheme.scm
+++ b/syntax-highlight/scheme.scm
@@ -35,6 +35,10 @@
(define (lisp-delimiter? char)
(char-set-contains? char-set:lisp-delimiters char))
+(define parse-symbol-chars
+ (parse-char-set
+ (char-set-complement char-set:lisp-delimiters)))
+
(define (parse-specials special-words)
"Create a parser for SPECIAL-WORDS, a list of important terms for a
language."
@@ -48,6 +52,15 @@ language."
(fold parse-either parse-never (map special special-words)))
+(define (parse-specials/regexp special-regexps)
+ (let ((merged-regexp
+ (string-join (map (lambda (regexp)
+ (string-append "(" regexp ")"))
+ special-regexps)
+ "|")))
+ (tagged-parser 'special
+ (parse-regexp merged-regexp parse-symbol-chars))))
+
(define (parse-openers openers)
(define (open opener)
(tagged-parser 'open (parse-string opener)))
@@ -69,9 +82,7 @@ language."
(tagged-parser 'keyword
(parse-map string-concatenate
(parse-each (parse-string "#:")
- (parse-char-set
- (char-set-complement
- char-set:lisp-delimiters))))))
+ parse-symbol-chars))))
(define parse-string-literal
(tagged-parser 'string (parse-delimited "\"")))
@@ -82,12 +93,30 @@ language."
(define parse-quoted-symbol
(tagged-parser 'symbol (parse-delimited "#{" #:until "}#")))
+(define %default-special-symbols
+ '("define" "begin" "call-with-current-continuation" "call/cc"
+ "call-with-input-file" "call-with-output-file"
+ "case" "cond"
+ "do" "else" "if"
+ "lambda" "λ"
+ "let" "let*" "let-syntax" "letrec" "letrec-syntax"
+ "export" "import" "library" "define-module" "use-module"
+ "let-values" "let*-values"
+ "and" "or"
+ "delay" "force"
+ "map" "for-each"
+ "syntax" "syntax-rules"))
+
+(define %default-special-regexps
+ '("^define"))
+
(define scheme-highlighter
(parse-many
(parse-any parse-whitespace
(parse-openers '("(" "[" "{"))
(parse-closers '(")" "]" "}"))
- (parse-specials '("define" "lambda"))
+ (parse-specials %default-special-symbols)
+ (parse-specials/regexp %default-special-regexps)
parse-string-literal
parse-comment
parse-keyword