diff options
Diffstat (limited to 'src/libexpr/lexer.l')
| -rw-r--r-- | src/libexpr/lexer.l | 30 |
1 files changed, 19 insertions, 11 deletions
diff --git a/src/libexpr/lexer.l b/src/libexpr/lexer.l index 5b1ff0350cd1..40ca77258037 100644 --- a/src/libexpr/lexer.l +++ b/src/libexpr/lexer.l @@ -142,25 +142,34 @@ or { return OR_KW; } \{ { return '{'; } <INSIDE_DOLLAR_CURLY>\{ { PUSH_STATE(INSIDE_DOLLAR_CURLY); return '{'; } -<INITIAL,INSIDE_DOLLAR_CURLY>\" { PUSH_STATE(STRING); return '"'; } +<INITIAL,INSIDE_DOLLAR_CURLY>\" { + PUSH_STATE(STRING); return '"'; + } <STRING>([^\$\"\\]|\$[^\{\"\\]|\\.|\$\\.)*\$/\" | <STRING>([^\$\"\\]|\$[^\{\"\\]|\\.|\$\\.)+ { - /* It is impossible to match strings ending with '$' with one - regex because trailing contexts are only valid at the end - of a rule. (A sane but undocumented limitation.) */ - yylval->e = unescapeStr(data->symbols, yytext); - return STR; - } + /* It is impossible to match strings ending with '$' with one + regex because trailing contexts are only valid at the end + of a rule. (A sane but undocumented limitation.) */ + yylval->e = unescapeStr(data->symbols, yytext); + return STR; + } <STRING>\$\{ { PUSH_STATE(INSIDE_DOLLAR_CURLY); return DOLLAR_CURLY; } -<STRING>\" { POP_STATE(); return '"'; } -<STRING>. return yytext[0]; /* just in case: shouldn't be reached */ +<STRING>\" { POP_STATE(); return '"'; } +<STRING>\$|\\|\$\\ { + /* This can only occur when we reach EOF, otherwise the above + (...|\$[^\{\"\\]|\\.|\$\\.)+ would have triggered. + This is technically invalid, but we leave the problem to the + parser who fails with exact location. */ + return STR; + } <INITIAL,INSIDE_DOLLAR_CURLY>\'\'(\ *\n)? { PUSH_STATE(IND_STRING); return IND_STRING_OPEN; } <IND_STRING>([^\$\']|\$[^\{\']|\'[^\'\$])+ { yylval->e = new ExprIndStr(yytext); return IND_STR; } -<IND_STRING>\'\'\$ { +<IND_STRING>\'\'\$ | +<IND_STRING>\$ { yylval->e = new ExprIndStr("$"); return IND_STR; } @@ -178,7 +187,6 @@ or { return OR_KW; } yylval->e = new ExprIndStr("'"); return IND_STR; } -<IND_STRING>. return yytext[0]; /* just in case: shouldn't be reached */ <INITIAL,INSIDE_DOLLAR_CURLY>{ |