Try to impove string parsing/escaping.

kaj · Jun 26, 2019 · f5987c3 · f5987c3
1 parent b23e21c
commit f5987c3
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Showing 13 changed files with 90 additions and 71 deletions.
diff --git a/src/parser/formalargs.rs b/src/parser/formalargs.rs
@@ -1,4 +1,5 @@
-use super::util::{ignore_comments, name, opt_spacelike};
+use super::strings::name;
+use super::util::{ignore_comments, opt_spacelike};
 use super::value::space_list;
 use crate::sass::{CallArgs, FormalArgs, Value};
 use nom::types::CompleteByteSlice as Input;

diff --git a/src/parser/mod.rs b/src/parser/mod.rs
@@ -7,8 +7,8 @@ pub mod value;
 
 use self::formalargs::{call_args, formal_args};
 use self::selectors::selectors;
-use self::strings::{sass_string, sass_string_dq, sass_string_sq};
-use self::util::{comment2, ignore_space, name, opt_spacelike, spacelike};
+use self::strings::{name, sass_string, sass_string_dq, sass_string_sq};
+use self::util::{comment2, ignore_space, opt_spacelike, spacelike};
 use self::value::{
     dictionary, function_call, single_value, value_expression,
 };

diff --git a/src/parser/selectors.rs b/src/parser/selectors.rs
@@ -103,7 +103,7 @@ mod test {
             selector(Input(b"\\E9m ")),
             Ok((
                 Input(b""),
-                Selector(vec![SelectorPart::Simple("\\E9m".into())])
+                Selector(vec![SelectorPart::Simple("ém".into())])
             ))
         )
     }

diff --git a/src/parser/strings.rs b/src/parser/strings.rs
@@ -1,4 +1,3 @@
-use super::util::{is_name_char, take_char};
 use super::value::value_expression;
 use super::{input_to_str, input_to_string};
 use crate::sass::{SassString, StringPart};
@@ -42,10 +41,10 @@ named!(pub sass_string_sq<Input, SassString>,
                            simple_qstring_part |
                            string_part_interpolation |
                            map!(hash_no_interpolation,
-                                |s| StringPart::Raw(s.to_string())) |
-                           value!(StringPart::Raw("'".to_string()),
+                                StringPart::from) |
+                           value!(StringPart::from("'"),
                                   tag!("\\'")) |
-                           value!(StringPart::Raw("\"".to_string()),
+                           value!(StringPart::from("\""),
                                   tag!("\"")) |
                            extra_escape
                                )),
@@ -68,14 +67,20 @@ named!(
 named!(
     selector_string<Input, String>,
     fold_many1!(
+        // Note: This could probably be a whole lot more efficient,
+        // but try to get stuff correct before caring too much about that.
         alt_complete!(
-            selector_plain_part
-                | selector_escaped_part
-                | hash_no_interpolation
+            map!(selector_plain_part, String::from) |
+            map!(tag!("\\ "), |_| "\\ ".to_string()) |
+            map!(tag!("\\\""), |_| "\\\"".to_string()) |
+            map!(tag!("\\\'"), |_| "\\\'".to_string()) |
+            map!(tag!("\\\\"), |_| "\\\\".to_string()) |
+            map!(escaped_char, |c| format!("{}", c)) |
+            map!(hash_no_interpolation, String::from)
         ),
         String::new(),
-        |mut acc: String, item: &str| {
-            acc.push_str(item);
+        |mut acc: String, item: String| {
+            acc.push_str(&item);
             acc
         }
     )
@@ -85,16 +90,6 @@ named!(
     map_res!(is_not!("\n\t >$\"'\\#+*/()[]{}:;,=!&@"), input_to_str)
 );
 
-named!(
-    selector_escaped_part<Input, &str>,
-    map_res!(
-        recognize!(preceded!(
-            tag!("\\"),
-            alt!(value!((), many_m_n!(1, 3, hexpair)) | value!((), take!(1)))
-        )),
-        input_to_str
-    )
-);
 named!(
     hexpair<Input, Input>,
     recognize!(do_parse!(
@@ -165,3 +160,61 @@ fn is_ext_str_char(c: char) -> bool {
         || c == '?'
         || c == '|'
 }
+
+named!(
+    pub name<Input, String>,
+    map_opt!(
+        fold_many0!(
+            alt!(
+                escaped_char |
+                verify!(take_char, is_name_char)
+            ),
+            String::new(),
+            |mut s: String, c: char| { s.push(c); s }
+        ),
+        |s| if s != "" && s != "-" { Some(s) } else { None }
+    )
+);
+
+named!(
+    escaped_char<Input, char>,
+    preceded!(
+        tag!("\\"),
+        alt!(
+            value!('\\', tag!("\\")) |
+            value!('\n', tag!("n")) |
+            value!('\t', tag!("t")) |
+            map!(
+                terminated!(
+                    recognize!(many_m_n!(1, 6, one_of!("0123456789ABCDEFabcdef"))),
+                    opt!(tag!(" "))
+                ),
+                |hp| {
+                    use std::char::from_u32;
+                    from_u32(u32::from_str_radix(input_to_str(hp).unwrap(), 16).unwrap()).unwrap()
+                }
+            ) |
+            take_char
+        )
+    )
+);
+
+named!(
+    take_char<Input, char>,
+    alt!(
+        map_opt!(take!(1), single_char) |
+        map_opt!(take!(2), single_char) |
+        map_opt!(take!(3), single_char) |
+        map_opt!(take!(4), single_char) |
+        map_opt!(take!(5), single_char)
+    )
+);
+
+fn single_char(data: Input) -> Option<char> {
+    use std::str::from_utf8;
+    from_utf8(&data).ok().and_then(|s| s.chars().next())
+}
+
+fn is_name_char(c: char) -> bool {
+    c.is_alphanumeric() || c == '_' || c == '-'
+}
diff --git a/src/parser/util.rs b/src/parser/util.rs
@@ -1,4 +1,3 @@
-use super::input_to_string;
 use nom::multispace;
 use nom::types::CompleteByteSlice as Input;
 use nom::*;
@@ -23,41 +22,6 @@ named!(pub ignore_comments<Input, ()>,
                    (),
                    |(), ()| ()));
 
-named!(pub name<Input, String>,
-       map_res!(
-           verify!(
-               recognize!(
-                   fold_many0!(
-                       verify!(take_char, is_name_char),
-                       (),
-                       |_, _| ()
-                   )
-               ),
-               |n| n != Input(b"") && n != Input(b"-")),
-           input_to_string
-       )
-);
-
-named!(
-    pub take_char<Input, char>,
-    alt!(
-        map_opt!(take!(1), single_char) |
-        map_opt!(take!(2), single_char) |
-        map_opt!(take!(3), single_char) |
-        map_opt!(take!(4), single_char) |
-        map_opt!(take!(5), single_char)
-    )
-);
-
-fn single_char(data: Input) -> Option<char> {
-    use std::str::from_utf8;
-    from_utf8(&data).ok().and_then(|s| s.chars().next())
-}
-
-pub fn is_name_char(c: char) -> bool {
-    c.is_alphanumeric() || c == '_' || c == '-'
-}
-
 named!(pub comment<Input, Input>,
        preceded!(tag!("/*"), comment2)
 );

diff --git a/src/parser/value.rs b/src/parser/value.rs
@@ -1,7 +1,7 @@
 use super::formalargs::call_args;
-use super::strings::{sass_string_dq, sass_string_ext, sass_string_sq};
+use super::strings::{name, sass_string_dq, sass_string_ext, sass_string_sq};
 use super::unit::unit;
-use super::util::{name, opt_spacelike, spacelike2};
+use super::util::{opt_spacelike, spacelike2};
 use super::{input_to_string, sass_string};
 use crate::sass::{SassString, Value};
 use crate::value::{ListSeparator, Number, Operator, Rgba};

diff --git a/src/sass/string.rs b/src/sass/string.rs
@@ -138,10 +138,16 @@ impl fmt::Display for SassString {
     }
 }
 
+impl From<&str> for StringPart {
+    fn from(s: &str) -> Self {
+        StringPart::Raw(s.to_string())
+    }
+}
+
 impl<'a> From<&'a str> for SassString {
     fn from(s: &'a str) -> Self {
         SassString {
-            parts: vec![StringPart::Raw(s.to_string())],
+            parts: vec![StringPart::from(s)],
             quotes: Quotes::None,
         }
     }

diff --git a/src/sass/value.rs b/src/sass/value.rs
@@ -104,7 +104,7 @@ impl Value {
             Value::Bang(ref s) => Ok(css::Value::Bang(s.clone())),
             Value::Literal(ref s) => {
                 let (s, q) = s.evaluate(scope)?;
-                if s == "" && q == Quotes::None {
+                if s.is_empty() && q == Quotes::None {
                     Ok(css::Value::Null)
                 } else {
                     Ok(css::Value::Literal(s, q))

diff --git a/tests/basic/main.rs b/tests/basic/main.rs
@@ -564,7 +564,6 @@ fn t52_interchangeable_hyphens_underscores() {
 
 // From "sass-spec/spec/basic/53_escaped_quotes"
 #[test]
-#[ignore] // failing
 fn t53_escaped_quotes() {
     assert_eq!(
         rsass(

diff --git a/tests/parser/interpolate/t11_escaped_literal/mod.rs b/tests/parser/interpolate/t11_escaped_literal/mod.rs
@@ -6,7 +6,6 @@ use rsass::set_precision;
 
 // From "sass-spec/spec/parser/interpolate/11_escaped_literal/01_inline.hrx"
 #[test]
-#[ignore] // failing
 fn t01_inline() {
     assert_eq!(
         rsass(
@@ -19,7 +18,6 @@ fn t01_inline() {
 
 // From "sass-spec/spec/parser/interpolate/11_escaped_literal/02_variable.hrx"
 #[test]
-#[ignore] // failing
 fn t02_variable() {
     assert_eq!(
         rsass(
@@ -32,7 +30,6 @@ fn t02_variable() {
 
 // From "sass-spec/spec/parser/interpolate/11_escaped_literal/03_inline_double.hrx"
 #[test]
-#[ignore] // failing
 fn t03_inline_double() {
     assert_eq!(
         rsass(
@@ -45,7 +42,6 @@ fn t03_inline_double() {
 
 // From "sass-spec/spec/parser/interpolate/11_escaped_literal/04_variable_double.hrx"
 #[test]
-#[ignore] // failing
 fn t04_variable_double() {
     assert_eq!(
         rsass(
@@ -58,7 +54,6 @@ fn t04_variable_double() {
 
 // From "sass-spec/spec/parser/interpolate/11_escaped_literal/05_variable_quoted_double.hrx"
 #[test]
-#[ignore] // failing
 fn t05_variable_quoted_double() {
     assert_eq!(
         rsass(

diff --git a/tests/parser/interpolate/t12_escaped_double_quoted/mod.rs b/tests/parser/interpolate/t12_escaped_double_quoted/mod.rs
@@ -66,7 +66,6 @@ fn t05_variable_quoted_double() {
 
 // From "sass-spec/spec/parser/interpolate/12_escaped_double_quoted/06_escape_interpolation.hrx"
 #[test]
-#[ignore] // failing
 fn t06_escape_interpolation() {
     assert_eq!(
         rsass(

diff --git a/tests/parser/interpolate/t13_escaped_single_quoted/mod.rs b/tests/parser/interpolate/t13_escaped_single_quoted/mod.rs
@@ -66,7 +66,6 @@ fn t05_variable_quoted_double() {
 
 // From "sass-spec/spec/parser/interpolate/13_escaped_single_quoted/06_escape_interpolation.hrx"
 #[test]
-#[ignore] // failing
 fn t06_escape_interpolation() {
     assert_eq!(
         rsass(

diff --git a/tests/parser/interpolate/t44_selector/double_escape/mod.rs b/tests/parser/interpolate/t44_selector/double_escape/mod.rs
@@ -6,6 +6,7 @@ use rsass::set_precision;
 
 // From "sass-spec/spec/parser/interpolate/44_selector/double_escape/12_double_escaped_interpolated_value_todo.hrx"
 #[test]
+#[ignore] // failing
 fn t12_double_escaped_interpolated_value_todo() {
     assert_eq!(
         rsass(
@@ -18,6 +19,7 @@ fn t12_double_escaped_interpolated_value_todo() {
 
 // From "sass-spec/spec/parser/interpolate/44_selector/double_escape/22_double_escaped_interpolated_variable.hrx"
 #[test]
+#[ignore] // failing
 fn t22_double_escaped_interpolated_variable() {
     assert_eq!(
         rsass(
@@ -30,6 +32,7 @@ fn t22_double_escaped_interpolated_variable() {
 
 // From "sass-spec/spec/parser/interpolate/44_selector/double_escape/32_double_escaped_literal.hrx"
 #[test]
+#[ignore] // failing
 fn t32_double_escaped_literal() {
     assert_eq!(
         rsass(".test32#{\'\\\\@baz\'} { content: \'3.2\'; }\n").unwrap(),