This is my proposal to add support for parse.error custom|detailed to
Java. I'm no Java programmer, and I have absolutely no idea if this
is the proper way to do it (and push parsers must be checked too).
But at least it's a starting point from which to discuss.
To see it work, have a look at examples/java/calc:
%define parse.error custom
...
%code {
static String _ (String s)
{
return s;
}
}
%%
class CalcLexer implements Calc.Lexer {
...
public void yyreportSyntaxError (Calc.Context ctx)
{
final int ARGMAX = 10;
int[] arg = new int[ARGMAX];
int n = ctx.yysyntaxErrorArguments (arg, ARGMAX);
System.err.print (ctx.yylocation + ": syntax error");
for (int i = 1; i < n; ++i)
System.err.print ((i == 1 ? ": expected " : " or ")
+ ctx.yysymbolName (arg[i]));
if (n != 0)
System.err.print (" before " + ctx.yysymbolName (arg[0]));
System.err.println ("");
}
...
It is available online here: https://github.com/akimd/bison/pull/27.
Akim Demaille (7):
m4: fix b4_token_format
java: add support for parse.error=detailed
java: introduce yyexpectedTokens
java: make the syntax error format string translatable
java: let the Context give access to yyntokens
java: add support for parse.error custom
java: provide Context with a more OO interface
TODO | 13 +
data/skeletons/bison.m4 | 6 +-
data/skeletons/c.m4 | 7 +
data/skeletons/java.m4 | 14 +
data/skeletons/lalr1.java | 300 ++++++++++++++--------
examples/c/bistromathic/bistromathic.test | 4 +-
examples/c/bistromathic/parse.y | 4 +-
examples/java/calc/Calc.test | 4 +-
examples/java/calc/Calc.y | 26 +-
src/output.c | 16 +-
tests/calc.at | 20 +-
tests/local.at | 23 ++
12 files changed, 307 insertions(+), 130 deletions(-)
--
2.25.0
