templater: unify "string" and "rawstring"

"rawstring" was introduced by 5ab28a2e9962, but it's no longer necessary
because c1975809a6b5 and fd5bc660c9f0 changed the way of processing string
literals.

This patch moves string decoding to the parsing phase as it was before:

  ('rawstring', s) -> ('string', s)
  ('string', s) -> ('string', s.decode('string-escape'))

mercurial/templater.py

@@ -22,7 +22,7 b' elements = {'
     ")": (0, None, None),
     "integer": (0, ("integer",), None),
     "symbol": (0, ("symbol",), None),
-    "rawstring": (0, ("rawstring",), None),
+    "string": (0, ("string",), None),
     "template": (0, ("template",), None),
     "end": (0, None, None),
 }
@@ -50,7 +50,7 b' def tokenize(program, start, end):'
                     pos += 2
                     continue
                 if d == c:
-                    yield ('rawstring', program[s:pos], s)
+                    yield ('string', program[s:pos], s)
                     break
                 pos += 1
             else:
@@ -83,7 +83,7 b' def tokenize(program, start, end):'
             #             escaped quoted string
             if c == 'r':
                 pos += 1
-                token = 'rawstring'
+                token = 'string'
             else:
                 token = 'template'
             quote = program[pos:pos + 2]
@@ -136,7 +136,7 b' def _parsetemplate(tmpl, start, stop, qu'
     >>> _parsetemplate(r'foo\"bar"baz', 0, 12, quote='"')
     ([('string', 'foo"'), ('string', 'bar')], 9)
     >>> _parsetemplate(r'foo\\"bar', 0, 10, quote='"')
-    ([('string', 'foo\\\\')], 6)
+    ([('string', 'foo\\')], 6)
     """
     parsed = []
     sepchars = '{' + quote
@@ -146,18 +146,19 b' def _parsetemplate(tmpl, start, stop, qu'
         n = min((tmpl.find(c, pos, stop) for c in sepchars),
                 key=lambda n: (n < 0, n))
         if n < 0:
-            parsed.append(('string', tmpl[pos:stop]))
+            parsed.append(('string', tmpl[pos:stop].decode('string-escape')))
             pos = stop
             break
         c = tmpl[n]
         bs = (n - pos) - len(tmpl[pos:n].rstrip('\\'))
         if bs % 2 == 1:
             # escaped (e.g. '\{', '\\\{', but not '\\{')
-            parsed.append(('string', (tmpl[pos:n - 1] + c)))
+            parsed.append(('string',
+                           tmpl[pos:n - 1].decode('string-escape') + c))
             pos = n + 1
             continue
         if n > pos:
-            parsed.append(('string', tmpl[pos:n]))
+            parsed.append(('string', tmpl[pos:n].decode('string-escape')))
         if c == quote:
             return parsed, n + 1
 
@@ -212,9 +213,6 b' def runinteger(context, mapping, data):'
     return int(data)
 
 def runstring(context, mapping, data):
-    return data.decode("string-escape")
-
-def runrawstring(context, mapping, data):
     return data
 
 def runsymbol(context, mapping, key):
@@ -659,7 +657,6 b' def word(context, mapping, args):'
 exprmethods = {
     "integer": lambda e, c: (runinteger, e[1]),
     "string": lambda e, c: (runstring, e[1]),
-    "rawstring": lambda e, c: (runrawstring, e[1]),
     "symbol": lambda e, c: (runsymbol, e[1]),
     "template": buildtemplate,
     "group": lambda e, c: compileexp(e[1], c, exprmethods),