* data/glr.c, data/lalr1.cc, data/yacc.cc, doc/bison.texinfo,

src/conflicts.c, src/parse-gram.y, src/tables.c, src/tables.h,
tests/action.at, tests/calc.at, tests/conflicts.at,
tests/cxx-type.at, tests/regression.at:
"parse error" -> "syntax error" for POSIX compatibility.
"parsing stack overflow..." -> "parser stack overflow" so
that code matches Bison documentation.
This commit is contained in:
Paul Eggert
2002-11-15 20:32:21 +00:00
parent 0f39aab92a
commit 6e649e659e
15 changed files with 80 additions and 62 deletions

View File

@@ -1373,7 +1373,7 @@ main (void)
When @code{yyparse} detects a syntax error, it calls the error reporting
function @code{yyerror} to print an error message (usually but not
always @code{"parse error"}). It is up to the programmer to supply
always @code{"syntax error"}). It is up to the programmer to supply
@code{yyerror} (@pxref{Interface, ,Parser C-Language Interface}), so
here is the definition we will use:
@@ -1583,7 +1583,7 @@ line: '\n'
@end example
This addition to the grammar allows for simple error recovery in the
event of a parse error. If an expression that cannot be evaluated is
event of a syntax error. If an expression that cannot be evaluated is
read, the error will be recognized by the third rule for @code{line},
and parsing will continue. (The @code{yyerror} function is still called
upon to print its message as well.) The action executes the statement
@@ -3671,7 +3671,7 @@ Generate the code processing the locations (@pxref{Action Features,
,Special Features for Use in Actions}). This mode is enabled as soon as
the grammar uses the special @samp{@@@var{n}} tokens, but if your
grammar does not use it, using @samp{%locations} allows for more
accurate parse error messages.
accurate syntax error messages.
@end deffn
@deffn {Directive} %name-prefix="@var{prefix}"
@@ -4134,7 +4134,7 @@ int yyparse (int *nastiness, int *randomness);
@cindex parse error
@cindex syntax error
The Bison parser detects a @dfn{parse error} or @dfn{syntax error}
The Bison parser detects a @dfn{syntax error} or @dfn{parse error}
whenever it reads a token which cannot satisfy any syntax rule. An
action in the grammar can also explicitly proclaim an error, using the
macro @code{YYERROR} (@pxref{Action Features, ,Special Features for Use
@@ -4143,14 +4143,14 @@ in Actions}).
The Bison parser expects to report the error by calling an error
reporting function named @code{yyerror}, which you must supply. It is
called by @code{yyparse} whenever a syntax error is found, and it
receives one argument. For a parse error, the string is normally
@w{@code{"parse error"}}.
receives one argument. For a syntax error, the string is normally
@w{@code{"syntax error"}}.
@findex %error-verbose
If you invoke the directive @code{%error-verbose} in the Bison
declarations section (@pxref{Bison Declarations, ,The Bison Declarations
Section}), then Bison provides a more verbose and specific error message
string instead of just plain @w{@code{"parse error"}}.
string instead of just plain @w{@code{"syntax error"}}.
The parser can detect one other kind of error: stack overflow. This
happens when the input contains constructions that are very deeply
@@ -5156,7 +5156,7 @@ provided which addresses this issue.
@cindex error recovery
@cindex recovery from errors
It is not usually acceptable to have a program terminate on a parse
It is not usually acceptable to have a program terminate on a syntax
error. For example, a compiler should recover sufficiently to parse the
rest of the input file and check it for errors; a calculator should accept
another expression.
@@ -5259,7 +5259,7 @@ this is unacceptable, then the macro @code{yyclearin} may be used to clear
this token. Write the statement @samp{yyclearin;} in the error rule's
action.
For example, suppose that on a parse error, an error handling routine is
For example, suppose that on a syntax error, an error handling routine is
called that advances the input stream to some point where parsing should
once again commence. The next symbol returned by the lexical scanner is
probably correct. The previous look-ahead token ought to be discarded
@@ -5646,7 +5646,7 @@ after having reduced a rule that produced an @code{exp}, the control
flow jumps to state 2. If there is no such transition on a nonterminal
symbol, and the lookahead is a @code{NUM}, then this token is shifted on
the parse stack, and the control flow jumps to state 1. Any other
lookahead triggers a parse error.''
lookahead triggers a syntax error.''
@cindex core, item set
@cindex item set core
@@ -5714,7 +5714,7 @@ because of the item @samp{exp -> exp . '+' exp}, if the lookahead if
@samp{+}, it will be shifted on the parse stack, and the automaton
control will jump to state 4, corresponding to the item @samp{exp -> exp
'+' . exp}. Since there is no default action, any other token than
those listed above will trigger a parse error.
those listed above will trigger a syntax error.
The state 3 is named the @dfn{final state}, or the @dfn{accepting
state}:
@@ -6300,7 +6300,7 @@ The predefined token onto which all undefined values returned by
A token name reserved for error recovery. This token may be used in
grammar rules so as to allow the Bison parser to recognize an error in
the grammar without halting the process. In effect, a sentence
containing an error may be recognized as valid. On a parse error, the
containing an error may be recognized as valid. On a syntax error, the
token @code{error} becomes the current look-ahead token. Actions
corresponding to @code{error} are then executed, and the look-ahead
token is reset to the token that originally caused the violation.
@@ -6415,7 +6415,7 @@ symbols and parser action. @xref{Tracing, ,Tracing Your Parser}.
@deffn {Macro} yyerrok
Macro to cause parser to recover immediately to its normal mode
after a parse error. @xref{Error Recovery}.
after a syntax error. @xref{Error Recovery}.
@end deffn
@deffn {Function} yyerror
@@ -6448,7 +6448,7 @@ variable within @code{yyparse}, and its address is passed to
@end deffn
@deffn {Variable} yynerrs
Global variable which Bison increments each time there is a parse error.
Global variable which Bison increments each time there is a syntax error.
(In a pure parser, it is a local variable within @code{yyparse}.)
@xref{Error Reporting, ,The Error Reporting Function @code{yyerror}}.
@end deffn
@@ -6715,10 +6715,6 @@ A grammar symbol standing for a grammatical construct that can
be expressed through rules in terms of smaller constructs; in other
words, a construct that is not a token. @xref{Symbols}.
@item Parse error
An error encountered during parsing of an input stream due to invalid
syntax. @xref{Error Recovery}.
@item Parser
A function that recognizes valid sentences of a language by analyzing
the syntax structure of a set of tokens passed to it from a lexical
@@ -6771,6 +6767,10 @@ A data structure where symbol names and associated data are stored
during parsing to allow for recognition and use of existing
information in repeated uses of a symbol. @xref{Multi-function Calc}.
@item Syntax error
An error encountered during parsing of an input stream due to invalid
syntax. @xref{Error Recovery}.
@item Token
A basic, grammatically indivisible unit of a language. The symbol
that describes a token in the grammar is a terminal symbol.