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authorFabian Schmitthenner <development@schmitthenner.eu>2016-01-12T20·34+0000
committerFabian Schmitthenner <development@schmitthenner.eu>2016-01-12T20·40+0000
commit8d22b26448a091c76ab972c0b0603daac5e255e4 (patch)
tree2bc4128f06dc22ec102e1ee058b0a952827c1cd2 /src/libexpr
parent4202b17666d4ccba825e204e142bc7e294a3ec86 (diff)
don't abort when given unmatched '}' with 'start-condition stack underflow'. This fixes #751
Diffstat (limited to 'src/libexpr')
-rw-r--r--src/libexpr/lexer.l24
1 files changed, 17 insertions, 7 deletions
diff --git a/src/libexpr/lexer.l b/src/libexpr/lexer.l
index 1f2957ec71ad..791b72a8b52c 100644
--- a/src/libexpr/lexer.l
+++ b/src/libexpr/lexer.l
@@ -8,6 +8,7 @@
 
 %x STRING
 %x IND_STRING
+%x INSIDE_DOLLAR_CURLY
 
 
 %{
@@ -93,6 +94,8 @@ URI         [a-zA-Z][a-zA-Z0-9\+\-\.]*\:[a-zA-Z0-9\%\/\?\:\@\&\=\+\$\,\-\_\.\!\~
 
 %%
 
+<INITIAL,INSIDE_DOLLAR_CURLY>{
+
 
 if          { return IF; }
 then        { return THEN; }
@@ -124,11 +127,15 @@ or          { return OR_KW; }
               return INT;
             }
 
-\$\{        { PUSH_STATE(INITIAL); return DOLLAR_CURLY; }
-\{          { PUSH_STATE(INITIAL); return '{'; }
-\}          { POP_STATE(); return '}'; }
+\$\{        { PUSH_STATE(INSIDE_DOLLAR_CURLY); return DOLLAR_CURLY; }
+\{          { return '{'; }
+}
+
+\}                     { return '}'; }
+<INSIDE_DOLLAR_CURLY>\}      { POP_STATE(); return '}'; }
+
+<INITIAL,INSIDE_DOLLAR_CURLY>\"          { PUSH_STATE(STRING); return '"'; }
 
-\"          { PUSH_STATE(STRING); return '"'; }
 <STRING>([^\$\"\\]|\$[^\{\"\\]|\\.|\$\\.)*\$/\" |
 <STRING>([^\$\"\\]|\$[^\{\"\\]|\\.|\$\\.)+ {
               /* It is impossible to match strings ending with '$' with one
@@ -137,11 +144,11 @@ or          { return OR_KW; }
               yylval->e = unescapeStr(data->symbols, yytext);
               return STR;
             }
-<STRING>\$\{  { PUSH_STATE(INITIAL); return DOLLAR_CURLY; }
+<STRING>\$\{  { PUSH_STATE(INSIDE_DOLLAR_CURLY); return DOLLAR_CURLY; }
 <STRING>\"  { POP_STATE(); return '"'; }
 <STRING>.   return yytext[0]; /* just in case: shouldn't be reached */
 
-\'\'(\ *\n)?     { PUSH_STATE(IND_STRING); return IND_STRING_OPEN; }
+<INITIAL,INSIDE_DOLLAR_CURLY>\'\'(\ *\n)?     { PUSH_STATE(IND_STRING); return IND_STRING_OPEN; }
 <IND_STRING>([^\$\']|\$[^\{\']|\'[^\'\$])+ {
                    yylval->e = new ExprIndStr(yytext);
                    return IND_STR;
@@ -158,7 +165,7 @@ or          { return OR_KW; }
                    yylval->e = unescapeStr(data->symbols, yytext + 2);
                    return IND_STR;
                  }
-<IND_STRING>\$\{ { PUSH_STATE(INITIAL); return DOLLAR_CURLY; }
+<IND_STRING>\$\{ { PUSH_STATE(INSIDE_DOLLAR_CURLY); return DOLLAR_CURLY; }
 <IND_STRING>\'\' { POP_STATE(); return IND_STRING_CLOSE; }
 <IND_STRING>\'   {
                    yylval->e = new ExprIndStr("'");
@@ -166,6 +173,8 @@ or          { return OR_KW; }
                  }
 <IND_STRING>.    return yytext[0]; /* just in case: shouldn't be reached */
 
+<INITIAL,INSIDE_DOLLAR_CURLY>{
+
 {PATH}      { yylval->path = strdup(yytext); return PATH; }
 {HPATH}     { yylval->path = strdup(yytext); return HPATH; }
 {SPATH}     { yylval->path = strdup(yytext); return SPATH; }
@@ -177,6 +186,7 @@ or          { return OR_KW; }
 
 .           return yytext[0];
 
+}
 
 %%