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read: Support R7RS |...| symbol notation.

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* libguile/private-options.h (SCM_R7RS_SYMBOLS_P): New macro.
  (SCM_N_READ_OPTIONS): Increment.

* libguile/read.c (scm_read_opts): Add entry for 'r7rs-symbols'.
  (t_read_opts): Add field for 'r7rs_symbols_p'.
  (scm_read_string_like_syntax): New function based on earlier
  'scm_read_string' that handles either string literals or R7RS quoted
  symbols (delimited by vertical bars), depending on the value of 'chr'.
  (scm_read_string): Reimplement based on 'scm_read_string_like_syntax'.
  (scm_read_r7rs_symbol): New static function.

* doc/ref/api-data.texi (Symbol Read Syntax): Briefly describe the R7RS
  symbol syntax, mention the 'r7rs-symbols' read option, and give some
  examples.

* doc/ref/api-evaluation.texi (Scheme Read): Mention the 'r7rs-symbols'
  read option.

* test-suite/tests/reader.test ("reading"): Add test.
This commit is contained in:
Mark H Weaver 2014-01-12 07:55:22 -05:00
parent b306fae0ab
commit dc59631d30
5 changed files with 58 additions and 10 deletions
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5
test-suite/tests/reader.test
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@ -238,6 +238,11 @@
(with-read-options '(case-insensitive)
(lambda ()
(read-string "GuiLe")))))
(pass-if-equal "r7rs-symbols"
(list 'a (string->symbol "Hello, this is | a \"test\"") 'b)
(with-read-options '(r7rs-symbols)
(lambda ()
(read-string "(a |H\\x65;llo, this is \\| a \"test\"| b)"))))
(pass-if "prefix keywords"
(eq? #:keyword
(with-read-options '(keywords prefix case-insensitive)