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Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 31 |
1 files changed, 31 insertions, 0 deletions
@@ -1,5 +1,36 @@ 2014-01-07 Kaz Kylheku <kaz@kylheku.com> + The lisp-parse function can now be called multiple times + on the same stream to extract multiple objects; the requirement + that the stream must hold exactly one complete Lisp object + with no following material is now lifted. + + * parser.l (YY_INPUT): Modified the macro so that it reads no more + than one character. Though this probably makes the lexer less + efficient, it gives us the important property that the lexer does + not scan ahead into the input stream, hogging data into its buffer + which is then destroyed. This is essential if the lisp-parse function + is to support multiple calls to pull objects one by one out of + a stream. + + * parser.y (spec): Use YYACCEPT in the SECRET_ESCAPE_E clause for + pulling a single expression out of the token stream. YYACCEPT + is a trick for not invoking the $accept : spec . $end production + which is implicitly built into the grammar, and which causes + a token of lookahead to occur. This allows us to read a full + expression without stealing any further token: but only if the + grammar is structured right. + (exprs): This phrase structure now handles the DOTDOT syntax. + There is no such thing as an expr DOTDOT expr expression any more; + it is in the list syntax (and not supported in the dot position). + (expr): Remove DOTDOT syntax. + + * txr.1: Updated description of .. syntax, and relaxed the description + of lisp-parse since it now allows multiple calls to extract + multiple objects. + +2014-01-07 Kaz Kylheku <kaz@kylheku.com> + * match.c (v_load): Call yylex_destroy after yyparse, so we don't have stray scanner state possibly interfering with a subsquent parse job. |