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https://github.com/golang/go
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17f90c68c6
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@ -914,6 +914,8 @@ char* lexname(int lex);
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void mkpackage(char* pkgname);
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void unimportfile(void);
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int32 yylex(void);
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extern int yylast;
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extern int yyprev;
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/*
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* mparith1.c
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@ -515,10 +515,33 @@ switch_body:
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}
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caseblock:
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case stmt_list
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case
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{
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// If the last token read by the lexer was consumed
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// as part of the case, clear it (parser has cleared yychar).
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// If the last token read by the lexer was the lookahead
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// leave it alone (parser has it cached in yychar).
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// This is so that the stmt_list action doesn't look at
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// the case tokens if the stmt_list is empty.
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yylast = yychar;
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}
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stmt_list
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{
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int last;
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// This is the only place in the language where a statement
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// list is not allowed to drop the final semicolon, because
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// it's the only place where a statement list is not followed
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// by a closing brace. Handle the error for pedantry.
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// Find the final token of the statement list.
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// yylast is lookahead; yyprev is last of stmt_list
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last = yyprev;
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if(last > 0 && last != ';' && yychar != '}')
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yyerror("missing statement after label");
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$$ = $1;
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$$->nbody = $2;
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$$->nbody = $3;
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}
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caseblock_list:
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@ -14,6 +14,8 @@
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extern int yychar;
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int windows;
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int yyprev;
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int yylast;
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static void lexinit(void);
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static void lexfini(void);
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@ -1140,6 +1142,10 @@ yylex(void)
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curio.nlsemi = 0;
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break;
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}
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// Track last two tokens returned by yylex.
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yyprev = yylast;
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yylast = lx;
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return lx;
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}
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