Merge pull request #762 from ctheune/ctheune-floats

Implement floats

1 files changed, 7 insertions, 0 deletions

diff --git a/src/libexpr/lexer.l b/src/libexpr/lexer.l
index 478f41641..701c01aff 100644
--- a/src/libexpr/lexer.l
+++ b/src/libexpr/lexer.l
@@ -86,6 +86,7 @@ static Expr * unescapeStr(SymbolTable & symbols, const char * s)
 
 ID          [a-zA-Z\_][a-zA-Z0-9\_\'\-]*
 INT         [0-9]+
+FLOAT       (([1-9][0-9]*\.[0-9]*)|(0?\.[0-9]+))([Ee][+-]?[0-9]+)?
 PATH        [a-zA-Z0-9\.\_\-\+]*(\/[a-zA-Z0-9\.\_\-\+]+)+
 HPATH       \~(\/[a-zA-Z0-9\.\_\-\+]+)+
 SPATH       \<[a-zA-Z0-9\.\_\-\+]+(\/[a-zA-Z0-9\.\_\-\+]+)*\>
@@ -126,6 +127,12 @@ or          { return OR_KW; }
                   throw ParseError(format("invalid integer ‘%1%’") % yytext);
               return INT;
             }
+{FLOAT}     { errno = 0;
+              yylval->nf = strtod(yytext, 0);
+              if (errno != 0)
+                  throw ParseError(format("invalid float ‘%1%’") % yytext);
+              return FLOAT;
+            }
 
 \$\{        { PUSH_STATE(INSIDE_DOLLAR_CURLY); return DOLLAR_CURLY; }
 }