templater: unify "string" and "rawstring"

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'))

--- a/mercurial/templater.py	Sun Jun 21 13:28:21 2015 +0900
+++ b/mercurial/templater.py	Sat Jun 20 18:24:11 2015 +0900
@@ -22,7 +22,7 @@
     ")": (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 @@
                     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 @@
             #             escaped quoted string
             if c == 'r':
                 pos += 1
-                token = 'rawstring'
+                token = 'string'
             else:
                 token = 'template'
             quote = program[pos:pos + 2]
@@ -136,7 +136,7 @@
     >>> _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 @@
         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 @@
     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 @@
 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),