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Revert "don't abort when given unmatched '}' with 'start-condition stack underflow'. This fixes #751"

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This reverts commit 8d22b26448. It
breaks Nixpkgs:

$ nix-env -qa
error: syntax error, unexpected IND_STR, expecting '}', at /home/eelco/Dev/nixpkgs-stable/pkgs/top-level/python-packages.nix:7605:8
This commit is contained in:
Eelco Dolstra 2016-01-19 20:33:32 +01:00
parent 4c8098f30c
commit 8120b6fb8a
1 changed files with 7 additions and 17 deletions
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24
src/libexpr/lexer.l
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@ -8,7 +8,6 @@
%x STRING %x STRING
%x IND_STRING %x IND_STRING
%x INSIDE_DOLLAR_CURLY
%{ %{
@ -94,8 +93,6 @@ URI [a-zA-Z][a-zA-Z0-9\+\-\.]*\:[a-zA-Z0-9\%\/\?\:\@\&\=\+\$\,\-\_\.\!\~
%% %%
<INITIAL,INSIDE_DOLLAR_CURLY>{
if { return IF; } if { return IF; }
then { return THEN; } then { return THEN; }
@ -127,15 +124,11 @@ or { return OR_KW; }
return INT; return INT;
} }
\$\{ { PUSH_STATE(INSIDE_DOLLAR_CURLY); return DOLLAR_CURLY; } \$\{ { PUSH_STATE(INITIAL); return DOLLAR_CURLY; }
\{ { return '{'; } \{ { PUSH_STATE(INITIAL); return '{'; }
} \} { POP_STATE(); return '}'; }
\} { return '}'; }
<INSIDE_DOLLAR_CURLY>\} { POP_STATE(); return '}'; }
<INITIAL,INSIDE_DOLLAR_CURLY>\" { PUSH_STATE(STRING); return '"'; }
\" { PUSH_STATE(STRING); return '"'; }
<STRING>([^\$\"\\]|\$[^\{\"\\]|\\.|\$\\.)*\$/\" | <STRING>([^\$\"\\]|\$[^\{\"\\]|\\.|\$\\.)*\$/\" |
<STRING>([^\$\"\\]|\$[^\{\"\\]|\\.|\$\\.)+ { <STRING>([^\$\"\\]|\$[^\{\"\\]|\\.|\$\\.)+ {
/* It is impossible to match strings ending with '$' with one /* It is impossible to match strings ending with '$' with one
@ -144,11 +137,11 @@ or { return OR_KW; }
yylval->e = unescapeStr(data->symbols, yytext); yylval->e = unescapeStr(data->symbols, yytext);
return STR; return STR;
} }
<STRING>\$\{ { PUSH_STATE(INSIDE_DOLLAR_CURLY); return DOLLAR_CURLY; } <STRING>\$\{ { PUSH_STATE(INITIAL); return DOLLAR_CURLY; }
<STRING>\" { POP_STATE(); return '"'; } <STRING>\" { POP_STATE(); return '"'; }
<STRING>. return yytext[0]; /* just in case: shouldn't be reached */ <STRING>. return yytext[0]; /* just in case: shouldn't be reached */
<INITIAL,INSIDE_DOLLAR_CURLY>\'\'(\ *\n)? { PUSH_STATE(IND_STRING); return IND_STRING_OPEN; } \'\'(\ *\n)? { PUSH_STATE(IND_STRING); return IND_STRING_OPEN; }
<IND_STRING>([^\$\']|\$[^\{\']|\'[^\'\$])+ { <IND_STRING>([^\$\']|\$[^\{\']|\'[^\'\$])+ {
yylval->e = new ExprIndStr(yytext); yylval->e = new ExprIndStr(yytext);
return IND_STR; return IND_STR;
@ -165,7 +158,7 @@ or { return OR_KW; }
yylval->e = unescapeStr(data->symbols, yytext + 2); yylval->e = unescapeStr(data->symbols, yytext + 2);
return IND_STR; return IND_STR;
} }
<IND_STRING>\$\{ { PUSH_STATE(INSIDE_DOLLAR_CURLY); return DOLLAR_CURLY; } <IND_STRING>\$\{ { PUSH_STATE(INITIAL); return DOLLAR_CURLY; }
<IND_STRING>\'\' { POP_STATE(); return IND_STRING_CLOSE; } <IND_STRING>\'\' { POP_STATE(); return IND_STRING_CLOSE; }
<IND_STRING>\' { <IND_STRING>\' {
yylval->e = new ExprIndStr("'"); yylval->e = new ExprIndStr("'");
@ -173,8 +166,6 @@ or { return OR_KW; }
} }
<IND_STRING>. return yytext[0]; /* just in case: shouldn't be reached */ <IND_STRING>. return yytext[0]; /* just in case: shouldn't be reached */
<INITIAL,INSIDE_DOLLAR_CURLY>{
{PATH} { yylval->path = strdup(yytext); return PATH; } {PATH} { yylval->path = strdup(yytext); return PATH; }
{HPATH} { yylval->path = strdup(yytext); return HPATH; } {HPATH} { yylval->path = strdup(yytext); return HPATH; }
{SPATH} { yylval->path = strdup(yytext); return SPATH; } {SPATH} { yylval->path = strdup(yytext); return SPATH; }
@ -186,7 +177,6 @@ or { return OR_KW; }
. return yytext[0]; . return yytext[0];
}
%% %%