String to int conversion. Closes #362.

mesonbuild/interpreter.py

@@ -2019,6 +2019,11 @@ class Interpreter():
             if method_name == 'startswith':
                 return obj.startswith(s)
             return obj.endswith(s)
+        elif method_name == 'to_int':
+            try:
+                return int(obj)
+            except Exception:
+                raise InterpreterException('String can not be converted to int: ' + obj)
         raise InterpreterException('Unknown method "%s" for a string.' % method_name)
 
     def to_native(self, arg):

test cases/common/42 string formatting/meson.build

@@ -40,3 +40,5 @@ endif
 if long.endswith(prefix)
   error('Not suffix.')
 endif
+
+assert('3'.to_int() == 3, 'String int conversion does not work.')

test cases/failing/25 int conversion/meson.build

@@ -0,0 +1,3 @@
+project('int conversion', 'c')
+
+'notanumber'.to_int()