Allow whitespace after line ending backslash (#162)

src/tokens.rs

@@ -364,7 +364,24 @@ impl<'a> Tokenizer<'a> {
                             let len = if c == 'u' {4} else {8};
                             val.push(me.hex(start, i, len)?);
                         }
-                        Some((_, '\n')) if multi => {
+                        Some((i, c @ ' ')) |
+                        Some((i, c @ '\t')) |
+                        Some((i, c @ '\n')) if multi => {
+                            if c != '\n' {
+                                while let Some((_, ch)) = me.chars.clone().next() {
+                                    match ch {
+                                        ' ' | '\t' => {
+                                            me.chars.next();
+                                            continue
+                                        },
+                                        '\n' => {
+                                            me.chars.next();
+                                            break
+                                        },
+                                        _ => return Err(Error::InvalidEscape(i, c)),
+                                    }
+                                }
+                            }
                             while let Some((_, ch)) = me.chars.clone().next() {
                                 match ch {
                                     ' ' | '\t' | '\n' => {

test-suite/tests/invalid/string-bad-line-ending-escape.toml

@@ -0,0 +1,3 @@
+invalid-escape = """\
+    This string has a non whitespace-character after the line ending escape. \  a
+"""

test-suite/tests/valid/multiline-string.json

@@ -15,6 +15,10 @@
         "type": "string",
         "value": ""
     },
+    "multiline_empty_five": {
+        "type": "string",
+        "value": ""
+    },
     "equivalent_one": {
         "type": "string",
         "value": "The quick brown fox jumps over the lazy dog."
@@ -26,5 +30,9 @@
     "equivalent_three": {
         "type": "string",
         "value": "The quick brown fox jumps over the lazy dog."
+    },
+    "equivalent_four": {
+        "type": "string",
+        "value": "The quick brown fox jumps over the lazy dog."
     }
 }

test-suite/tests/valid/multiline-string.toml

@@ -7,6 +7,11 @@ multiline_empty_four = """\
    \
    \
    """
+multiline_empty_five = """\
+   \ 
+   \	
+   \ 	
+   """
 
 equivalent_one = "The quick brown fox jumps over the lazy dog."
 equivalent_two = """
@@ -21,3 +26,9 @@ equivalent_three = """\
        fox jumps over \
        the lazy dog.\
        """
+
+equivalent_four = """\
+       The quick brown \ 
+       fox jumps over \				
+       the lazy dog.\	
+       """