[librsvg/rustification] path_parser.rs: Test and fix handling of numbers with decimals

[Federico Mena Quintero <federico src gnome org>]

commit 5d07d93a20eaf900417959f1d756373b01bc9248
Author: Federico Mena Quintero <federico gnome org>
Date:   Fri Nov 4 13:59:23 2016 -0600

    path_parser.rs: Test and fix handling of numbers with decimals

 rust/src/path_parser.rs |   35 ++++++++++++++++++++++++-----------
 1 files changed, 24 insertions(+), 11 deletions(-)
---
diff --git a/rust/src/path_parser.rs b/rust/src/path_parser.rs
index fb2155b..226b32c 100644
--- a/rust/src/path_parser.rs
+++ b/rust/src/path_parser.rs
@@ -110,6 +110,16 @@ impl<'external> PathParser<'external> {
         }
     }
 
+    fn lookahead_is (&self, c: char) -> bool {
+        if let Some (x) = self.lookahead {
+            if x == c {
+                return true;
+            }
+        }
+
+        false
+    }
+
     fn lookahead_is_digit (&self, d: &mut char) -> bool {
         if let Some (c) = self.lookahead {
             if c.is_digit (10) {
@@ -144,7 +154,7 @@ impl<'external> PathParser<'external> {
 
         let mut c: char = ' ';
 
-        if self.lookahead_is_digit (&mut c) {
+        if self.lookahead_is_digit (&mut c) || self.lookahead_is ('.') {
             /* Integer part */
 
             while self.lookahead_is_digit (&mut c) {
@@ -218,16 +228,6 @@ impl<'external> PathParser<'external> {
         None
     }
 
-    fn lookahead_is (&self, c: char) -> bool {
-        if let Some (x) = self.lookahead {
-            if x == c {
-                return true;
-            }
-        }
-
-        false
-    }
-
     fn emit_line_to (&mut self, absolute: bool, x: f64, y: f64) {
         if absolute {
             self.current_x = x;
@@ -481,6 +481,19 @@ mod tests {
     }
 
     #[test]
+    fn path_parser_handles_numbers () {
+        test_parser ("M 10 20",
+                     &vec![
+                         moveto (10.0, 20.0)
+                     ]);
+
+        test_parser ("M .10 0.20",
+                     &vec![
+                         moveto (0.10, 0.20)
+                     ]);
+    }
+
+    #[test]
     fn path_parser_handles_single_moveto () {
         test_parser ("M 10 20",
                      &vec![