X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/d6dc4d36d1db744b060029254eaabaaa525a1c19..534497f54ba955ba2173ecb9eb8128b45c745b62:/src/scan-gram.l diff --git a/src/scan-gram.l b/src/scan-gram.l index e6f42ea9..665e80de 100644 --- a/src/scan-gram.l +++ b/src/scan-gram.l @@ -1,6 +1,6 @@ /* Bison Grammar Scanner -*- C -*- - Copyright (C) 2002-2012 Free Software Foundation, Inc. + Copyright (C) 2002-2013 Free Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. @@ -77,9 +77,7 @@ static size_t no_cr_read (FILE *, char *, size_t); #define DEPRECATED(Msg) \ do { \ size_t i; \ - complain (loc, Wdeprecated, \ - _("deprecated directive: %s, use %s"), \ - quote (yytext), quote_n (1, Msg)); \ + deprecated_directive (loc, yytext, Msg); \ scanner_cursor.column -= mbsnwidth (Msg, strlen (Msg), 0); \ for (i = strlen (Msg); i != 0; --i) \ unput (Msg[i - 1]); \ @@ -114,7 +112,12 @@ static void unexpected_newline (boundary, char const *); /* A identifier was just read in directives/rules. Special state to capture the sequence 'identifier :'. */ %x SC_AFTER_IDENTIFIER - /* A complex tag, with nested angles brackets. */ + + /* POSIX says that a tag must be both an id and a C union member, but + historically almost any character is allowed in a tag. We + disallow NUL, as this simplifies our implementation. We match + angle brackets in nested pairs: several languages use them for + generics/template types. */ %x SC_TAG /* Four types of user code: @@ -135,13 +138,6 @@ notletter [^.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]{-}[%\{] id {letter}({letter}|[-0-9])* int [0-9]+ -/* POSIX says that a tag must be both an id and a C union member, but - historically almost any character is allowed in a tag. We disallow - NUL, as this simplifies our implementation. We disallow angle - bracket to match them in nested pairs: several languages use them - for generics/template types. */ -tag [^\0<>]+ - /* Zero or more instances of backslash-newline. Following GCC, allow white space between the backslash and the newline. */ splice (\\[ \f\t\v]*\n)* @@ -219,6 +215,7 @@ eqopt ([[:space:]]*=)? "%defines" return PERCENT_DEFINES; "%destructor" return PERCENT_DESTRUCTOR; "%dprec" return PERCENT_DPREC; + "%empty" return PERCENT_EMPTY; "%error-verbose" return PERCENT_ERROR_VERBOSE; "%expect" return PERCENT_EXPECT; "%expect-rr" return PERCENT_EXPECT_RR; @@ -326,13 +323,6 @@ eqopt ([[:space:]]*=)? /* A type. */ "<*>" return TAG_ANY; "<>" return TAG_NONE; - "<"{tag}">" { - obstack_grow (&obstack_for_string, yytext + 1, yyleng - 2); - STRING_FINISH; - val->uniqstr = uniqstr_new (last_string); - STRING_FREE; - return TAG; - } "<" { nesting = 0; token_start = loc->start; @@ -519,23 +509,15 @@ eqopt ([[:space:]]*=)? { - "\""|"\n" { - if (yytext[0] == '\n') - unexpected_newline (token_start, "\""); - STRING_FINISH; - loc->start = token_start; - val->chars = last_string; - BEGIN INITIAL; - return STRING; - } - <> { - unexpected_eof (token_start, "\""); + "\"" { STRING_FINISH; loc->start = token_start; - val->chars = last_string; + val->code = last_string; BEGIN INITIAL; return STRING; } + <> unexpected_eof (token_start, "\""); + "\n" unexpected_newline (token_start, "\""); } /*----------------------------------------------------------. @@ -545,55 +527,34 @@ eqopt ([[:space:]]*=)? { - "'"|"\n" { - STRING_FINISH; - loc->start = token_start; - val->character = last_string[0]; - { - /* FIXME: Eventually, make these errors. */ - if (last_string[0] == '\0') - { - complain (loc, Wother, _("empty character literal")); - /* '\0' seems dangerous even if we are about to complain. */ - val->character = '\''; - } - else if (last_string[1] != '\0') - complain (loc, Wother, - _("extra characters in character literal")); - } - if (yytext[0] == '\n') - unexpected_newline (token_start, "'"); - STRING_FREE; - BEGIN INITIAL; - return CHAR; - } - <> { + "'" { STRING_FINISH; loc->start = token_start; val->character = last_string[0]; + + /* FIXME: Eventually, make these errors. */ + if (last_string[0] == '\0') { - /* FIXME: Eventually, make these errors. */ - if (last_string[0] == '\0') - { - complain (loc, Wother, _("empty character literal")); - /* '\0' seems dangerous even if we are about to complain. */ - val->character = '\''; - } - else if (last_string[1] != '\0') - complain (loc, Wother, - _("extra characters in character literal")); + complain (loc, Wother, _("empty character literal")); + /* '\0' seems dangerous even if we are about to complain. */ + val->character = '\''; } - unexpected_eof (token_start, "'"); + else if (last_string[1] != '\0') + complain (loc, Wother, + _("extra characters in character literal")); STRING_FREE; BEGIN INITIAL; return CHAR; } + "\n" unexpected_newline (token_start, "'"); + <> unexpected_eof (token_start, "'"); } - /*-----------------------------------------------------------. - | Scanning a Bison nested tag. The initial angle bracket is | - | already eaten. | - `-----------------------------------------------------------*/ + + + /*--------------------------------------------------------------. + | Scanning a tag. The initial angle bracket is already eaten. | + `--------------------------------------------------------------*/ { @@ -611,18 +572,10 @@ eqopt ([[:space:]]*=)? STRING_GROW; } - [^<>]+ STRING_GROW; + ([^<>]|->)+ STRING_GROW; "<"+ STRING_GROW; nesting += yyleng; - <> { - unexpected_eof (token_start, ">"); - STRING_FINISH; - loc->start = token_start; - val->uniqstr = uniqstr_new (last_string); - STRING_FREE; - BEGIN INITIAL; - return TAG; - } + <> unexpected_eof (token_start, ">"); } /*----------------------------. @@ -693,15 +646,15 @@ eqopt ([[:space:]]*=)? { "'" STRING_GROW; BEGIN context_state; - \n unexpected_newline (token_start, "'"); BEGIN context_state; - <> unexpected_eof (token_start, "'"); BEGIN context_state; + \n unexpected_newline (token_start, "'"); + <> unexpected_eof (token_start, "'"); } { "\"" STRING_GROW; BEGIN context_state; - \n unexpected_newline (token_start, "\""); BEGIN context_state; - <> unexpected_eof (token_start, "\""); BEGIN context_state; + \n unexpected_newline (token_start, "\""); + <> unexpected_eof (token_start, "\""); } @@ -752,15 +705,7 @@ eqopt ([[:space:]]*=)? (as '<' '<%'). */ "<"{splice}"<" STRING_GROW; - <> { - int token = (YY_START == SC_BRACED_CODE) ? BRACED_CODE : BRACED_PREDICATE; - unexpected_eof (code_start, "}"); - STRING_FINISH; - loc->start = code_start; - val->code = last_string; - BEGIN INITIAL; - return token; - } + <> unexpected_eof (code_start, "}"); } @@ -806,19 +751,12 @@ eqopt ([[:space:]]*=)? "%}" { STRING_FINISH; loc->start = code_start; - val->chars = last_string; + val->code = last_string; BEGIN INITIAL; return PROLOGUE; } - <> { - unexpected_eof (code_start, "%}"); - STRING_FINISH; - loc->start = code_start; - val->chars = last_string; - BEGIN INITIAL; - return PROLOGUE; - } + <> unexpected_eof (code_start, "%}"); } @@ -832,7 +770,7 @@ eqopt ([[:space:]]*=)? <> { STRING_FINISH; loc->start = code_start; - val->chars = last_string; + val->code = last_string; BEGIN INITIAL; return EPILOGUE; } @@ -1001,8 +939,8 @@ handle_syncline (char *args, location loc) /*----------------------------------------------------------------. | For a token or comment starting at START, report message MSGID, | -| which should say that an end marker was found before | -| the expected TOKEN_END. | +| which should say that an end marker was found before the | +| expected TOKEN_END. Then, pretend that TOKEN_END was found. | `----------------------------------------------------------------*/ static void @@ -1011,8 +949,17 @@ unexpected_end (boundary start, char const *msgid, char const *token_end) location loc; loc.start = start; loc.end = scanner_cursor; + size_t i = strlen (token_end); + +/* Adjust scanner cursor so that any later message does not count + the characters about to be inserted. */ + scanner_cursor.column -= i; + + while (i != 0) + unput (token_end[--i]); + token_end = quote (token_end); - // Instead of '\'', display "'". + /* Instead of '\'', display "'". */ if (STREQ (token_end, "'\\''")) token_end = "\"'\""; complain (&loc, complaint, _(msgid), token_end); @@ -1022,6 +969,7 @@ unexpected_end (boundary start, char const *msgid, char const *token_end) /*------------------------------------------------------------------------. | Report an unexpected EOF in a token or comment starting at START. | | An end of file was encountered and the expected TOKEN_END was missing. | +| After reporting the problem, pretend that TOKEN_END was found. | `------------------------------------------------------------------------*/ static void