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Enable parsing stand-alone rational expressions with the LTL parser.

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* src/ltlparse/ltlparse.yy (parse_ratexp): New function.
(START_LTL, START_RATEXP): Add these new tokens.
(result): Parse and LTL formula or a rational expression depending
on the start symbol.
* src/ltlparse/public.hh (parse_ratexp): New function.
* src/ltlparse/parsedecl.hh (flex_set_buffer): Add a new argument
to set the starting rule.
* src/ltlparse/ltlscan.ll (flex_set_buffer): Adjust.
(start_token): New global variable.  Return this as first token if
it is set.
This commit is contained in:
Alexandre Duret-Lutz 2010-02-08 11:36:55 +01:00
parent c6dd811b08
commit 9aebb80e08
4 changed files with 92 additions and 19 deletions
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10
src/ltlparse/ltlscan.ll
View file

@ -43,14 +43,16 @@
static const char* to_parse = 0;
static size_t to_parse_size = 0;
static int start_token = 0;
typedef ltlyy::parser::token token;
void
flex_set_buffer(const char* buf)
flex_set_buffer(const char* buf, int start_tok)
{
to_parse = buf;
to_parse_size = strlen(to_parse);
start_token = start_tok;
}
%}
@ -60,6 +62,12 @@ flex_set_buffer(const char* buf)
%%
%{
if (start_token)
{
int t = start_token;
start_token = 0;
return t;
}
yylloc->step();
%}