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java: demonstrate push parsers

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* data/skeletons/lalr1.java (Location): Make it a static class.
(Lexer.yylex, Lexer.getLVal, Lexer.getStartPos, Lexer.getEndPos):
These are not needed in push parsers.
* examples/java/calc/Calc.y: Demonstrate push parsers in the Java.
* doc/bison.texi: Push parsers have been supported for a long time,
remove incorrect statements stating the opposite.
This commit is contained in:
Akim Demaille
2020-05-02 09:01:34 +02:00
parent ac2ba46053
commit 13a1537dba
6 changed files with 55 additions and 48 deletions
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11
doc/bison.texi
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@@ -13341,9 +13341,9 @@ changed using @code{%define api.location.type @{@var{class-name}@}}.
@end deftypemethod
@deftypemethod {Lexer} {int} yylex ()
Return the next token. Its type is the return value, its semantic
value and location are saved and returned by the their methods in the
interface.
Return the next token. Its type is the return value, its semantic value and
location are saved and returned by the their methods in the interface. Not
needed for push-only parsers.
Use @samp{%define lex_throws} to specify any uncaught exceptions.
Default is @code{java.io.IOException}.
@@ -13353,7 +13353,7 @@ Default is @code{java.io.IOException}.
@deftypemethodx {Lexer} {Position} getEndPos ()
Return respectively the first position of the last token that @code{yylex}
returned, and the first position beyond it. These methods are not needed
unless location tracking is active.
unless location tracking and pull parsing are active.
They should return new objects for each call, to avoid that all the symbol
share the same Position boundaries.
@@ -13363,7 +13363,8 @@ The return type can be changed using @code{%define api.position.type
@end deftypemethod
@deftypemethod {Lexer} {Object} getLVal ()
Return the semantic value of the last token that yylex returned.
Return the semantic value of the last token that yylex returned. Not needed
for push-only parsers.
The return type can be changed using @samp{%define api.value.type
@{@var{class-name}@}}.