[v0.1.0] - Improve regex to capture newlines & add tests

src/links.rs

@@ -1,5 +1,7 @@
+use std::collections::VecDeque;
 use std::fs;
 use std::path::{Path, PathBuf};
+use std::str::SplitN;
 
 use aho_corasick::AhoCorasick;
 use anyhow::Context;
@@ -8,20 +10,21 @@ use lazy_static::lazy_static;
 use mdbook::errors::Result;
 
 const ESCAPE_CHAR: char = '\\';
+const LINE_BREAKS: &[char] = &['\n', '\r'];
 
 lazy_static! {
-    // r"(?x)\\\{\{\#.*\}\}|\{\{\s*\#(template)\s+([a-zA-Z0-9_.\/-]+)\s*([^}]+)\}\}")
+    // r"(?x)\\\{\{\#.*\}\}|\{\{\s*\#(template)\s+([a-zA-Z0-9_^'<>().:*+|\\\/?-]+)\s+([^}]+)\}\}")
     static ref WHOLE_TEMPLATE: Regex = Regex::new(
-            r"(?x)              # insignificant whitespace mode
-            \\\{\{\#.*\}\}      # match escaped link
-            |                   # or
-            \{\{\s*             # link opening parens and whitespace
-            \#(template)        # link type - template
-            \s+                 # separating whitespace
-            ([a-zA-Z0-9_.\/-]+) # relative path to template file 
-            \s+                 # separating whitespace
-            ([^}]+)             # get all template arguments
-            \}\}                # link closing parens"
+            r"(?x)                              # insignificant whitespace mode
+            \\\{\{\#.*\}\}                      # match escaped link
+            |                                   # or
+            \{\{\s*                             # link opening parens and whitespace
+            \#(template)                        # link type - template
+            \s+                                 # separating whitespace
+            ([a-zA-Z0-9_^'<>().:*+|\\\/?-]+)    # relative path to template file 
+            \s+                                 # separating whitespace
+            ([^}]+)                             # get all template arguments
+            \}\}                                # link closing parens"
         )
         .unwrap();
     // https://stackoverflow.com/questions/22871602/optimizing-regex-to-fine-key-value-pairs-space-delimited
@@ -46,17 +49,35 @@ impl<'a> Link<'a> {
         let mut values: Vec<String> = vec![];
 
         let link_type = match (cap.get(0), cap.get(1), cap.get(2), cap.get(3)) {
+            (Some(mat), _, _, _) if mat.as_str().contains(LINE_BREAKS) => {
+                let mut args = mat
+                    .as_str()
+                    .lines()
+                    .map(|line| {
+                        let end_trimmed = line.trim_end_matches(LINE_BREAKS);
+                        end_trimmed.trim_start_matches(LINE_BREAKS)
+                    })
+                    .collect::<VecDeque<&str>>();
+
+                // Remove {{#template
+                args.pop_front();
+                // Remove ending }}
+                args.pop_back();
+                // Store relative path of template file
+                let file = args.pop_front().unwrap();
+
+                for arg in args {
+                    let capture = arg.splitn(2, '=');
+                    populate_key_values(&mut keys, &mut values, capture);
+                }
+
+                Some(LinkType::Template(PathBuf::from(file.trim())))
+            }
             (_, _, Some(file), Some(args)) => {
                 let matches = ARGS.captures_iter(args.as_str());
                 for mat in matches {
                     let capture = mat.unwrap().get(0).unwrap().as_str().splitn(2, '=');
-                    for (i, capt) in capture.enumerate() {
-                        if i % 2 == 0 {
-                            keys.push(format!("{{{}}}", capt));
-                        } else {
-                            values.push(capt.to_string());
-                        }
-                    }
+                    populate_key_values(&mut keys, &mut values, capture);
                 }
                 Some(LinkType::Template(PathBuf::from(file.as_str())))
             }
@@ -86,7 +107,7 @@ impl<'a> Link<'a> {
                 fs::read_to_string(&target)
                     .with_context(|| {
                         format!(
-                            "Could not read file for link {} ({})",
+                            "Could not read template file {} ({})",
                             self.link_text,
                             target.display(),
                         )
@@ -140,6 +161,20 @@ pub(crate) fn extract_template_links(contents: &str) -> LinkIter<'_> {
     LinkIter(WHOLE_TEMPLATE.captures_iter(contents))
 }
 
+fn populate_key_values<'a>(
+    keys: &mut Vec<String>,
+    values: &mut Vec<String>,
+    split_str: SplitN<'a, char>,
+) {
+    for (i, capt) in split_str.enumerate() {
+        if i % 2 == 0 {
+            keys.push(format!("{{{}}}", capt.trim()));
+        } else {
+            values.push(capt.to_string());
+        }
+    }
+}
+
 #[cfg(test)]
 mod link_tests {
     use std::path::PathBuf;
@@ -164,20 +199,44 @@ mod link_tests {
 
     #[test]
     fn test_extract_zero_template_links() {
-        let string = "This is some text without any template links";
-        assert_eq!(extract_template_links(string).collect::<Vec<_>>(), vec![])
+        let s = "This is some text without any template links";
+        assert_eq!(extract_template_links(s).collect::<Vec<_>>(), vec![])
     }
 
     #[test]
     fn test_extract_zero_template_links_without_args() {
-        let string = "{{#template templates/footer.md}}";
-        assert_eq!(extract_template_links(string).collect::<Vec<_>>(), vec![])
+        let s = "{{#template templates/footer.md}}";
+        assert_eq!(extract_template_links(s).collect::<Vec<_>>(), vec![])
     }
 
     #[test]
-    fn test_extract_template_links_simple_link() {
+    fn test_extract_template_links_partial_match() {
+        let s = "Some random text with {{#template...";
+        assert_eq!(extract_template_links(s).collect::<Vec<_>>(), vec![]);
+        let s = "Some random text with {{#template footer.md...";
+        assert_eq!(extract_template_links(s).collect::<Vec<_>>(), vec![]);
+        let s = "Some random text with {{#template footer.md path=../images...";
+        assert_eq!(extract_template_links(s).collect::<Vec<_>>(), vec![]);
+        let s = "Some random text with \\{{#template...";
+        assert_eq!(extract_template_links(s).collect::<Vec<_>>(), vec![]);
+    }
+
+    #[test]
+    fn test_extract_template_links_empty() {
+        let s = "Some random text with {{#template}} and {{#template  }} {{}} {{#}}...";
+        assert_eq!(extract_template_links(s).collect::<Vec<_>>(), vec![]);
+    }
+
+    #[test]
+    fn test_extract_template_links_unknown() {
+        let s = "Some random text with {{#templatee file.rs}} and {{#include}} {{#playground}} {{#tempate}}...";
+        assert!(extract_template_links(s).collect::<Vec<_>>() == vec![]);
+    }
+
+    #[test]
+    fn test_extract_template_links_simple() {
         let s =
-            "Some random text with {{#template file.rs}} and {{#template test.rs test=nice}}...";
+            "Some random text with {{#template file.rs}} and {{#template test.rs lang=rust}}...";
 
         let res = extract_template_links(s).collect::<Vec<_>>();
 
@@ -187,8 +246,157 @@ mod link_tests {
                 start_index: 48,
                 end_index: 79,
                 link_type: LinkType::Template(PathBuf::from("test.rs")),
-                link_text: "{{#template test.rs test=nice}}",
-                args: VecPair(vec!["{test}".to_string()], vec!["nice".to_string()])
+                link_text: "{{#template test.rs lang=rust}}",
+                args: VecPair(vec!["{lang}".to_string()], vec!["rust".to_string()])
+            },]
+        );
+    }
+
+    #[test]
+    fn test_extract_template_links_simple_with_equals_sign() {
+        let s = "Some random text with{{#template test.rs lang=rust math=2+2=4}}...";
+
+        let res = extract_template_links(s).collect::<Vec<_>>();
+
+        assert_eq!(
+            res,
+            vec![Link {
+                start_index: 21,
+                end_index: 63,
+                link_type: LinkType::Template(PathBuf::from("test.rs")),
+                link_text: "{{#template test.rs lang=rust math=2+2=4}}",
+                args: VecPair(
+                    vec!["{lang}".to_string(), "{math}".to_string()],
+                    vec!["rust".to_string(), "2+2=4".to_string()],
+                )
+            },]
+        );
+    }
+
+    #[test]
+    fn test_extract_template_links_simple_with_whitespace() {
+        let s = "Some random text with {{#template test.rs lang=rust authors=Goudham & Hazel}}...";
+
+        let res = extract_template_links(s).collect::<Vec<_>>();
+
+        assert_eq!(
+            res,
+            vec![Link {
+                start_index: 22,
+                end_index: 77,
+                link_type: LinkType::Template(PathBuf::from("test.rs")),
+                link_text: "{{#template test.rs lang=rust authors=Goudham & Hazel}}",
+                args: VecPair(
+                    vec!["{lang}".to_string(), "{authors}".to_string()],
+                    vec!["rust".to_string(), "Goudham & Hazel".to_string()]
+                )
+            },]
+        );
+    }
+
+    #[test]
+    fn test_extract_template_links_simple_with_tabs() {
+        let s = "Some random text with {{#template      test.rs      lang=rust authors=Goudham & Hazel}}...";
+
+        let res = extract_template_links(s).collect::<Vec<_>>();
+
+        assert_eq!(
+            res,
+            vec![Link {
+                start_index: 22,
+                end_index: 87,
+                link_type: LinkType::Template(PathBuf::from("test.rs")),
+                link_text: "{{#template      test.rs      lang=rust authors=Goudham & Hazel}}",
+                args: VecPair(
+                    vec!["{lang}".to_string(), "{authors}".to_string()],
+                    vec!["rust".to_string(), "Goudham & Hazel".to_string()]
+                )
+            },]
+        );
+    }
+
+    #[test]
+    fn test_extract_template_links_with_special_characters() {
+        let s = "Some random text with {{#template foo-bar\\-baz/_c++.rs path=images}}...";
+
+        let res = extract_template_links(s).collect::<Vec<_>>();
+
+        assert_eq!(
+            res,
+            vec![Link {
+                start_index: 22,
+                end_index: 68,
+                link_type: LinkType::Template(PathBuf::from("foo-bar\\-baz/_c++.rs")),
+                link_text: "{{#template foo-bar\\-baz/_c++.rs path=images}}",
+                args: VecPair(vec!["{path}".to_string()], vec!["images".to_string()])
+            },]
+        );
+    }
+
+    #[test]
+    fn test_extract_template_links_newlines() {
+        let s = "{{#template
+            test.rs
+            lang=rust
+            authors=Goudham & Hazel
+            year=2022
+        }}";
+
+        let res = extract_template_links(s).collect::<Vec<_>>();
+
+        assert_eq!(
+            res,
+            vec![Link {
+                start_index: 0,
+                end_index: 122,
+                link_type: LinkType::Template(PathBuf::from("test.rs")),
+                link_text: "{{#template\n            test.rs\n            lang=rust\n            authors=Goudham & Hazel\n            year=2022\n        }}",
+                args: VecPair(
+                    vec![
+                        "{lang}".to_string(),
+                        "{authors}".to_string(),
+                        "{year}".to_string()
+                    ],
+                    vec![
+                        "rust".to_string(),
+                        "Goudham & Hazel".to_string(),
+                        "2022".to_string()
+                    ]
+                )
+            },]
+        );
+    }
+
+    #[test]
+    fn test_extract_template_links_with_newlines_tabs() {
+        let s = "{{#template
+    test.rs
+lang=rust
+        authors=Goudham & Hazel
+year=2022
+}}";
+
+        let res = extract_template_links(s).collect::<Vec<_>>();
+
+        assert_eq!(
+            res,
+            vec![Link {
+                start_index: 0,
+                end_index: 78,
+                link_type: LinkType::Template(PathBuf::from("test.rs")),
+                link_text: "{{#template\n    test.rs\nlang=rust\n        authors=Goudham & Hazel\nyear=2022\n}}",
+                args: VecPair(
+                    vec![
+                        "{lang}".to_string(),
+                        "{authors}".to_string(),
+                        "{year}".to_string()
+                    ],
+                    vec![
+                        "rust".to_string(),
+                        "Goudham & Hazel".to_string(),
+                        "2022".to_string()
+                    ]
+                )
             },]
         );
     }