[gtk/matthiasc/for-master] css: Fix parsing of scientific notation

[Matthias Clasen <matthiasc src gnome org>]

commit 0f42d37f8bc7b6879be0a1b2766fc6119eb9f616
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Aug 29 12:12:09 2020 -0400

    css: Fix parsing of scientific notation
    
    The parser got its chars mixed up while parsing numbers
    like 2.3e-04. While it is unlikely to meet such numbers
    in human-generated css, we do have them e.g. when saving
    render node trees with transforms.
    
    Also add some css parser tests for number parsing.

 gtk/css/gtkcsstokenizer.c                  |  7 +++----
 testsuite/css/parser/number-values.css     | 31 ++++++++++++++++++++++++++++++
 testsuite/css/parser/number-values.ref.css | 31 ++++++++++++++++++++++++++++++
 3 files changed, 65 insertions(+), 4 deletions(-)
---
diff --git a/gtk/css/gtkcsstokenizer.c b/gtk/css/gtkcsstokenizer.c
index 7aa3ff25e7..607c4d6992 100644
--- a/gtk/css/gtkcsstokenizer.c
+++ b/gtk/css/gtkcsstokenizer.c
@@ -1056,13 +1056,12 @@ gtk_css_tokenizer_read_numeric (GtkCssTokenizer *tokenizer,
         }
     }
 
-  if (data + 1 < tokenizer->end && (*data == 'e' || *data == 'E') && 
-      (g_ascii_isdigit (data[1]) || 
-       (data + 2 < tokenizer->end && (data[1] == '+' || data[2] == '-') && g_ascii_isdigit (data[2]))))
+  if (data + 1 < tokenizer->end && (*data == 'e' || *data == 'E') &&
+      (g_ascii_isdigit (data[1]) ||
+       (data + 2 < tokenizer->end && (data[1] == '+' || data[1] == '-') && g_ascii_isdigit (data[2]))))
     {
       is_int = FALSE;
       data++;
-      exponent = g_ascii_digit_value (*data);
 
       if (*data == '-')
         {
diff --git a/testsuite/css/parser/number-values.css b/testsuite/css/parser/number-values.css
new file mode 100644
index 0000000000..6bb0ad02ba
--- /dev/null
+++ b/testsuite/css/parser/number-values.css
@@ -0,0 +1,31 @@
+a {
+  -gtk-dpi: 0;
+}
+
+b {
+  -gtk-dpi: 100;
+}
+
+c {
+  -gtk-dpi: -39;
+}
+
+d {
+  -gtk-dpi: 0.5;
+}
+
+e {
+  -gtk-dpi: 2.6e2;
+}
+
+f {
+  -gtk-dpi: 2.6E20;
+}
+
+g {
+  -gtk-dpi: 5e-1;
+}
+
+h {
+  -gtk-dpi: 2E-19;
+}
diff --git a/testsuite/css/parser/number-values.ref.css b/testsuite/css/parser/number-values.ref.css
new file mode 100644
index 0000000000..ba560741c4
--- /dev/null
+++ b/testsuite/css/parser/number-values.ref.css
@@ -0,0 +1,31 @@
+a {
+  -gtk-dpi: 0;
+}
+
+b {
+  -gtk-dpi: 100;
+}
+
+c {
+  -gtk-dpi: -39;
+}
+
+d {
+  -gtk-dpi: 0.5;
+}
+
+e {
+  -gtk-dpi: 260;
+}
+
+f {
+  -gtk-dpi: 2.6e+20;
+}
+
+g {
+  -gtk-dpi: 0.5;
+}
+
+h {
+  -gtk-dpi: 2e-19;
+}