Robert Wilhelm : vbscript: Parse decimal literals between -1 and 1 without 0 in front.

[Alexandre Julliard]

Module: wine
Branch: oldstable
Commit: e1460b2794d8e34a42c06e5077eaeb59b4aa838a
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=e1460b2794d8e34a42c06e507...

Author: Robert Wilhelm <robert.wilhelm(a)gmx.net>
Date:   Tue Sep 15 13:33:38 2020 +0200

vbscript: Parse decimal literals between -1 and 1 without 0 in front.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=49820
Signed-off-by: Robert Wilhelm <robert.wilhelm(a)gmx.net>
Signed-off-by: Jacek Caban <jacek(a)codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard(a)winehq.org>
(cherry picked from commit a31023a67812714f503250dc25abbc086439790a)
Signed-off-by: Michael Stefaniuc <mstefani(a)winehq.org>

---

 dlls/vbscript/lex.c          | 11 +++++++++--
 dlls/vbscript/tests/lang.vbs |  3 +++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/dlls/vbscript/lex.c b/dlls/vbscript/lex.c
index 444774b4341..2fee702ac8f 100644
--- a/dlls/vbscript/lex.c
+++ b/dlls/vbscript/lex.c
@@ -390,11 +390,18 @@ static int parse_next_token(void *lval, parser_ctx_t *ctx)
         /*
          * We need to distinguish between '.' used as part of a member expression and
          * a beginning of a dot expression (a member expression accessing with statement
-         * expression).
+         * expression) and a floating point number like ".2" .
          */
         c = ctx->ptr > ctx->code ? ctx->ptr[-1] : '\n';
+        if (is_identifier_char(c) || c == ')') {
+            ctx->ptr++;
+            return '.';
+        }
+        c = ctx->ptr[1];
+        if('0' <= c && c <= '9')
+            return parse_numeric_literal(ctx, lval);
         ctx->ptr++;
-        return is_identifier_char(c) || c == ')' ? '.' : tDOT;
+        return tDOT;
     case '-':
         if(ctx->is_html && ctx->ptr[1] == '-' && ctx->ptr[2] == '>')
             return comment_line(ctx);
diff --git a/dlls/vbscript/tests/lang.vbs b/dlls/vbscript/tests/lang.vbs
index 570b5befeaa..95988a4e1d9 100644
--- a/dlls/vbscript/tests/lang.vbs
+++ b/dlls/vbscript/tests/lang.vbs
@@ -47,6 +47,8 @@ Call ok(56.789e-2 = 0.56789, "56.789e-2 <> 0.56789")
 Call ok(1e-94938484 = 0, "1e-... <> 0")
 Call ok(34e0 = 34, "34e0 <> 34")
 Call ok(34E1 = 340, "34E0 <> 340")
+Call ok(.5 = 0.5, ".5 <> 0.5")
+Call ok(.5e1 = 5, ".5e1 <> 5")
 Call ok(--1 = 1, "--1 = " & --1)
 Call ok(-empty = 0, "-empty = " & (-empty))
 Call ok(true = -1, "! true = -1")
@@ -81,6 +83,7 @@ Call ok(getVT(null) = "VT_NULL", "getVT(null) is not VT_NULL")
 Call ok(getVT(0) = "VT_I2", "getVT(0) is not VT_I2")
 Call ok(getVT(1) = "VT_I2", "getVT(1) is not VT_I2")
 Call ok(getVT(0.5) = "VT_R8", "getVT(0.5) is not VT_R8")
+Call ok(getVT(.5) = "VT_R8", "getVT(.5) is not VT_R8")
 Call ok(getVT(0.0) = "VT_R8", "getVT(0.0) is not VT_R8")
 Call ok(getVT(2147483647) = "VT_I4", "getVT(2147483647) is not VT_I4")
 Call ok(getVT(2147483648) = "VT_R8", "getVT(2147483648) is not VT_R8")