The compiler can currently handle the include keyword.

Skipping the Lexer, the parser can find and replace the include statement
as long as it is on a line by itself.

examples/compile.rs

@@ -25,9 +25,20 @@ pub const TEST_OUTPUT_FILENAME: &'static str = "test.rs";
 ///
 pub fn main()
 {
+   let mut compiler: Compiler;
+   let mut include: PathBuf;
    let mut input: PathBuf;
    let mut output: PathBuf;
 
+   // Create a new compiler.
+   compiler = Compiler::new();
+
+   // Add the resource directory as an include directory
+   // for the compiler.
+   include = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+   include.push(RESOURCE_DIR);
+   compiler.register_include_dir(&include);
+
    // Get the input file to test with. It is in the
    // resources directory.
    input = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
@@ -41,5 +52,5 @@ pub fn main()
    output.push(TEST_OUTPUT_FILENAME);
 
    println!("Compiling {:?} to {:?}", input, output);
-   Compiler::compile(input, output);
+   compiler.compile(input, output);
 }

src/compiler.rs

@@ -2,8 +2,11 @@ use std::fs::File;
 use std::io::Write;
 use std::path::Path;
 
-use super::lexer::Lexer;
+use ::lexer::Lexer;
-use super::reader::Reader;
+use ::parser::Parser;
+use ::reader::Reader;
+use ::util::Util;
+
 
 
 const FILE_HEADER: &'static str =
@@ -14,41 +17,39 @@ const FILE_HEADER: &'static str =
 
 
 ///
-pub enum Compiler
+pub struct Compiler
 {
+   util: Util
 }
 
 
 
 /// Reads an input File and parses it.
-fn read_file(input_path: &Path) -> String
+pub fn read_file(util: &Util, input_path: &Path) -> String
 {
    let mut output: String;
    let mut reader: Reader;
+   let mut lines: Vec<String>;
 
-   output = String::from(FILE_HEADER);
+   // Create the output string of the compiled file.
+   output = String::new();
 
    // Create a Reader from the given input file.
    reader = Reader::from_file(input_path);
 
-   // Use the Lexer to scan the Reader's
+   Lexer::scan(&mut reader);
-   // buffer into tokens.
+
-   match Lexer::scan(reader)
+   /*
+   // Parse the file and turn it into a set of compiled lines.
+   lines = Parser::parse(&util, &mut reader);
+
+   // Add all these lines to the final output.
+   for line in lines.into_iter()
    {
-      Ok(tokens) =>
+      output.push_str(&line);
-      {
-         for token in tokens
-         {
-            output.push_str(&token);
-         }
-      }
-
-      Err(error) =>
-      {
-         error!("{}", error);
-      }
    }
-
+*/
+   // Return the final output.
    output
 }
 
@@ -90,14 +91,42 @@ fn write_file(output_path: &Path, output: String)
 
 impl Compiler
 {
-   /// Compile
+   /// Create a new Compiler to use.
-   pub fn compile<F>(input: F, output: F)
+   pub fn new() -> Compiler
+   {
+      Compiler
+      {
+         util: Util::new()
+      }
+   }
+
+   /// Register an include directory.
+   pub fn register_include_dir(&mut self, include_dir: &Path)
+   {
+      self.util.register_include_dir(include_dir);
+   }
+
+   /// Register a list of include directories.
+   pub fn register_include_dirs(&mut self, include_dirs: Vec<&Path>)
+   {
+      for dir in include_dirs.iter()
+      {
+         self.register_include_dir(dir);
+      }
+   }
+
+   /// Compile a given input file.
+   pub fn compile<F>(&self, input: F, output: F)
       where F: AsRef<Path>
    {
-      let output_string: String;
+      let mut output_string: String;
+
+      // Create the output string of the compiled file.
+      // Start it with the compilation header.
+      output_string = String::from(FILE_HEADER);
 
       // Turn the input file into a compiled String.
-      output_string = read_file(input.as_ref());
+      output_string.push_str(&read_file(&self.util, input.as_ref()));
 
       // Write the compiled output file.
       write_file(output.as_ref(), output_string);

src/lexer.rs

@@ -1,66 +0,0 @@
-use super::reader::Reader;
-
-
-
-///
-pub enum Lexer
-{
-}
-
-
-/// Determines if a character is alphabetic.
-fn is_alpha(c: char) -> bool
-{
-   c.is_alphabetic()
-}
-
-/// Determines if a character is a numeral
-fn is_numeric(c: char) -> bool
-{
-   c.is_numeric()
-}
-
-/// Determines if a character is whitespace.
-fn is_whitespace(c: char) -> bool
-{
-   c.is_whitespace()
-}
-
-/// Returns true if the next set of characters starts with
-/// the given pattern; Otherwise, false.
-fn starts_with<P>(pattern: P) -> bool
-   where P: AsRef<str>
-{
-   false
-}
-
-/// Consume and discard zero or more whitespace characters.
-fn consume_whitespace()
-{
-   consume_while(is_whitespace);
-}
-
-/// Consume characters until the test returns false.
-fn consume_while<F>(test: F) -> String
-   where F: Fn(char) -> bool
-{
-   String::new()
-}
-
-
-
-impl Lexer
-{
-   /// Scan the data held by the Reader. This will consume the Reader and
-   /// clear it.
-   pub fn scan(reader: Reader) -> Result<Vec<String>, String>
-   {
-      let tokens: Vec<String>;
-
-      // Create a new list to hold all the discovered tokens.
-      tokens = Vec::new();
-
-      // Return the scanned tokens.
-      Ok(tokens)
-   }
-}

src/lexer/lexer.rs

@@ -0,0 +1,377 @@
+use ::reader::Reader;
+use ::lexer::token::Token;
+use ::lexer::token_types::TokenTypes;
+
+
+
+/// The keywords for this language.
+const keywords: [&'static str; 1] = ["include"];
+
+
+
+/// Performs lexigraphical analysis on
+/// the text given from a Reader.
+pub enum Lexer
+{
+}
+
+
+
+/// Determines if a character is alphabetic.
+fn is_alpha(c: char) -> bool
+{
+   c.is_alphabetic()
+}
+
+/// Determines if a character is a numeral
+fn is_numeric(c: char) -> bool
+{
+   c.is_numeric()
+}
+
+/// Determines if a character is a numeral
+fn is_alphanumeric(c: char) -> bool
+{
+   is_alpha(c) | is_numeric(c)
+}
+
+/// Determines if a character is whitespace.
+fn is_whitespace(c: char) -> bool
+{
+   c.is_whitespace()
+}
+
+fn is_non_whitespace(c: char) -> bool
+{
+   !is_whitespace(c)
+}
+
+/// Determines if a character is a symbol.
+fn is_symbol(c: char) -> bool
+{
+   is_whitespace(c) == false && is_alphanumeric(c) == false
+}
+
+/// Determines if a String is a keyword.
+fn is_keyword(s: String) -> bool
+{
+   for keyword in keywords.iter()
+   {
+      if &s == keyword
+      {
+         return true
+      }
+   }
+
+   false
+}
+
+/// Returns true if the next set of characters starts with
+/// the given pattern; Otherwise, false.
+fn starts_with<P>(pattern: P) -> bool
+   where P: AsRef<str>
+{
+   false
+}
+
+/// Consume and discard zero or more whitespace characters.
+fn consume_whitespace(reader: &mut Reader) -> String
+{
+   consume_while(reader, is_whitespace)
+}
+
+///
+fn consume_symbol(reader: &mut Reader) -> String
+{
+   let mut is_valid: bool;
+   let mut buffer: String;
+
+   // Create a buffer to store all the consumed characters.
+   buffer = String::new();
+
+   // Check if the first character from the Reader
+   // is a symbol character.
+   match reader.get_char()
+   {
+      Ok(read_character) =>
+      {
+         is_valid = is_symbol(read_character);
+      }
+
+      Err(error) =>
+      {
+         warn!("{}", error);
+         is_valid = false;
+      }
+   }
+
+   if is_valid == true
+   {
+      // Consume this character that passed.
+      match reader.consume_char()
+      {
+         Ok(character) =>
+         {
+            // Add this consumed character to the buffer.
+            buffer.push(character);
+         }
+
+         Err(error) =>
+         {
+            error!("{}", error);
+         }
+      }
+   }
+
+   // Return the buffer of consumed characters.
+   buffer
+}
+
+///
+fn consume_numeral(reader: &mut Reader) -> String
+{
+   let mut is_valid: bool;
+   let mut buffer: String;
+
+   // Create a buffer to store all the consumed characters.
+   buffer = String::new();
+
+   // Check if the first character from the Reader
+   // is a numeric character.
+   match reader.get_char()
+   {
+      Ok(read_character) =>
+      {
+         is_valid = is_numeric(read_character);
+      }
+
+      Err(error) =>
+      {
+         warn!("{}", error);
+         is_valid = false;
+      }
+   }
+
+   // If the first character is valid, then consume it and
+   // consume any numeric characters that follow.
+   if is_valid == true
+   {
+      // Consume this character that passed.
+      match reader.consume_char()
+      {
+         Ok(character) =>
+         {
+            // Add this consumed character to the buffer.
+            buffer.push(character);
+         }
+
+         Err(error) =>
+         {
+            error!("{}", error);
+         }
+      }
+
+      // Now read any numeric characters that follow.
+      buffer.push_str(&consume_while(reader, is_non_whitespace));
+   }
+
+   // Return the buffer of consumed characters.
+   buffer
+}
+
+///
+fn consume_identifier(reader: &mut Reader) -> String
+{
+   let mut is_valid: bool;
+   let mut buffer: String;
+
+   // Create a buffer to store all the consumed characters.
+   buffer = String::new();
+
+   // Check if the first character from the Reader
+   // is an alpha character.
+   match reader.get_char()
+   {
+      Ok(read_character) =>
+      {
+         is_valid = is_alpha(read_character);
+      }
+
+      Err(error) =>
+      {
+         warn!("{}", error);
+         is_valid = false;
+      }
+   }
+
+   // If the first character is valid, then consume it and
+   // consume any alphanumeric character the follow.
+   if is_valid == true
+   {
+      // Consume this character that passed.
+      match reader.consume_char()
+      {
+         Ok(character) =>
+         {
+            // Add this consumed character to the buffer.
+            buffer.push(character);
+         }
+
+         Err(error) =>
+         {
+            error!("{}", error);
+         }
+      }
+
+      // Now read any alphanumeric characters that follow.
+      buffer.push_str(&consume_while(reader, is_alphanumeric));
+   }
+
+   // Return the buffer of consumed characters.
+   buffer
+}
+
+/// Consume characters until the test returns false.
+fn consume_while<F>(reader: &mut Reader, test: F) -> String
+   where F: Fn(char) -> bool
+{
+   let mut is_valid: bool;
+   let mut buffer: String;
+
+   // Create a buffer to store all the consumed characters.
+   buffer = String::new();
+
+   // Get a character from the reader.
+   match reader.get_char()
+   {
+      Ok(read_character) =>
+      {
+         is_valid = test(read_character);
+      }
+
+      Err(error) =>
+      {
+         warn!("{}", error);
+         is_valid = false;
+      }
+   }
+
+   // Loop until we get to invalid input.
+   while is_valid == true
+   {
+      // Consume this character that passed.
+      match reader.consume_char()
+      {
+         Ok(character) =>
+         {
+            // Add this consumed character to the buffer.
+            buffer.push(character);
+
+            // Get a character from the reader.
+            match reader.get_char()
+            {
+               Ok(read_character) =>
+               {
+                  is_valid = test(read_character);
+               }
+
+               Err(error) =>
+               {
+                  warn!("{}", error);
+                  is_valid = false;
+               }
+            }
+         }
+
+         Err(error) =>
+         {
+            is_valid = false;
+            error!("{}", error);
+         }
+      }
+   }
+
+   // Return the buffer of consumed characters.
+   buffer
+}
+
+
+
+impl Lexer
+{
+   /// Scan the data held by the Reader. This will consume the Reader and
+   /// clear it.
+   pub fn scan(reader: &mut Reader) -> Result<Vec<Token>, &'static str>
+   {
+      let mut test_char: char;
+      let mut token: Token;
+      let mut tokens: Vec<Token>;
+
+      // Create a new list to hold all the discovered tokens.
+      tokens = Vec::new();
+
+      // Begin turning the input into tokens.
+      while reader.is_eob() == false
+      {
+         test_char = try!(reader.get_char());
+         if is_whitespace(test_char)
+         {
+            // Just skip/remove any whitespace.
+            token = Token::from(consume_whitespace(reader));
+            token.set_type(TokenTypes::Whitespace);
+
+            // Push the token into the list.
+            tokens.push(token);
+         }
+         else if is_numeric(test_char)
+         {
+            // The next character is a numeric,
+            // so we are probably looking at a numeral.
+            token = Token::from(consume_numeral(reader));
+            token.set_type(TokenTypes::Numeric);
+
+            // Push the token into the list.
+            tokens.push(token);
+         }
+         else if is_alpha(test_char)
+         {
+            // The next character is an alpha character,
+            // so we are probably looking at an identifier.
+            token = Token::from(consume_identifier(reader));
+
+            // Determine if this identifier is a keyword.
+            if is_keyword(token.to_string()) == true
+            {
+               token.set_type(TokenTypes::Keyword);
+            }
+            else
+            {
+               token.set_type(TokenTypes::Identifier);
+            }
+
+            // Push the token into the list.
+            tokens.push(token);
+         }
+         else
+         {
+            // This must be some kind of symbol.
+            token = Token::from(consume_symbol(reader));
+            token.set_type(TokenTypes::Unknown);
+
+            // Push the token into the list.
+            tokens.push(token);
+         }
+      }
+
+      // Clear the reader since we are finished with it.
+      reader.clear();
+
+for token in tokens.iter()
+{
+   println!("{}: {}", token.get_type(), token);
+}
+
+      // Return the scanned tokens.
+      Ok(tokens)
+   }
+}

src/lexer/mod.rs

@@ -0,0 +1,9 @@
+mod lexer;
+mod token;
+mod token_types;
+
+
+
+pub use self::lexer::Lexer;
+pub use self::token::Token;
+pub use self::token_types::TokenTypes;

src/lexer/token.rs

@@ -0,0 +1,103 @@
+use std::convert::From;
+use std::str::FromStr;
+
+use ::lexer::token_types::TokenTypes;
+
+
+
+///
+pub struct Token
+{
+   ///
+   string: String,
+
+   ///
+   variant: TokenTypes
+}
+
+
+
+impl Token
+{
+   ///
+   pub fn new() -> Token
+   {
+      Token::from("")
+   }
+
+   ///
+   pub fn get_type(&self) -> TokenTypes
+   {
+      self.variant
+   }
+
+   ///
+   pub fn set_type(&mut self, token_type: TokenTypes)
+   {
+      self.variant = token_type;
+   }
+}
+
+impl ::std::str::FromStr for Token
+{
+   type Err = String;
+
+   fn from_str(s: &str) -> Result<Token, String>
+   {
+      let token: Token;
+
+      // Create the new Token from the given &str.
+      token =
+         Token
+         {
+            string: String::from(s),
+            variant: TokenTypes::Unknown
+         };
+
+      // Return the token.
+      Ok(token)
+   }
+}
+
+impl<'a> ::std::convert::From<&'a str> for Token
+{
+   fn from(s: &'a str) -> Self
+   {
+      // Just call the FromStr and handle the error.
+      match Token::from_str(s)
+      {
+         Ok(token) =>
+         {
+            token
+         }
+
+         Err(error) =>
+         {
+            // Just warn and create a blank unknown Token.
+            warn!("{}", error);
+            Token
+            {
+               string: String::new(),
+               variant: TokenTypes::Unknown
+            }
+         }
+      }
+   }
+}
+
+impl From<String> for Token
+{
+   fn from(s: String) -> Self
+   {
+      // Just call the From<&str>.
+      Token::from(s.as_str())
+   }
+}
+
+impl ::std::fmt::Display for Token
+{
+   fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result
+   {
+      write!(f, "{}", self.string)
+   }
+}

src/lexer/token_types.rs

@@ -0,0 +1,104 @@
+/// The different types of Tokens.
+#[derive(Clone, Copy, PartialEq, PartialOrd, Eq, Ord)]
+pub enum TokenTypes
+{
+   /// A Comment token.
+   Comment,
+
+   /// An Identifier that has been confirmed
+   /// to be a Keyword.
+   Keyword,
+
+   /// An alpha character followed by
+   /// zero or more of alpha characters, numeric characters,
+   /// or underscores. After the first character these can be
+   /// mixed in any order.
+   Identifier,
+
+   /// A numeric character followed by
+   /// zero or more numeric characters, zero or one period,
+   /// and zero or one appendable type identifies.
+   Numeric,
+
+   /// A set of characters within double quote marks.
+   /// These follow Rust's standard of escape characters.
+   StaticString,
+
+   /// This token is just whitespace,
+   /// one or more space characters.
+   Whitespace,
+
+   /// This token has something, but we don't know what.
+   /// This should not occur.
+   Unknown
+}
+
+
+
+impl TokenTypes
+{
+   /// Get a str representation of this variant.
+   pub fn to_str(&self) -> &'static str
+   {
+      match *self
+      {
+         TokenTypes::Comment =>
+         {
+            "Comment"
+         }
+
+         TokenTypes::Keyword =>
+         {
+            "Keyword"
+         }
+
+         TokenTypes::Identifier =>
+         {
+            "Identifier"
+         }
+
+         TokenTypes::Numeric =>
+         {
+            "Numeric"
+         }
+
+         TokenTypes::StaticString =>
+         {
+            "Unknown"
+         }
+
+         TokenTypes::Whitespace =>
+         {
+            "Whitespace"
+         }
+
+         TokenTypes::Unknown =>
+         {
+            "Unknown"
+         }
+      }
+   }
+
+   /// Get a String representation of this variant.
+   pub fn to_string(&self) -> String
+   {
+      String::from(self.to_str())
+   }
+}
+
+impl ::std::fmt::Debug for TokenTypes
+{
+   fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result
+   {
+      write!(f, "{}", self.to_str())
+   }
+}
+
+impl ::std::fmt::Display for TokenTypes
+{
+   fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result
+   {
+      write!(f, "{}", self.to_str())
+   }
+}
+

src/lib.rs

@@ -7,6 +7,7 @@ mod compiler;
 mod lexer;
 mod parser;
 mod reader;
+mod util;
 
 
 

src/parser.rs

@@ -1,11 +1,90 @@
-///
+use std::path::PathBuf;
-pub struct Parser
-{
-   ///
-   position: usize,
 
-   ///
+use ::compiler::read_file;
-   input: String
+use ::reader::Reader;
+use ::util::Util;
+
+
+
+///
+pub enum Parser
+{
+}
+
+
+
+///
+fn process_line(util: &Util, output: &mut Vec<String>, line: String)
+{
+   let start: usize;
+   let end: usize;
+   let mut include_file: PathBuf;
+   let mut processed_line: String;
+
+   // Copy the given line.
+   processed_line = line.clone();
+
+   // Remove any code block brackets.
+   processed_line = processed_line.replace("{@", "");
+   processed_line = processed_line.replace("@}", "");
+
+   // Just handling the include code right now.
+   if processed_line.contains("include") == true
+   {
+      // Parse one or more include statements on a line.
+
+      // Cut out the include statement so it can be processed.
+      match processed_line.find("\"")
+      {
+         Some(location) =>
+         {
+            // Add one to move past the quote mark.
+            start = location + 1usize;
+         }
+
+         None =>
+         {
+            start = 0usize;
+         }
+      }
+
+      match processed_line[start..].find("\"")
+      {
+         Some(location) =>
+         {
+            end = start + location;
+         }
+
+         None =>
+         {
+            end = start + 0usize;
+         }
+      }
+
+      include_file = PathBuf::from(&processed_line[start..end]);
+
+      // Try to find the include file in one of the
+      // include directories.
+      match util.get_include_file_path(&include_file)
+      {
+         Some(file) =>
+         {
+            // Process the include file found and add it to
+            // the output list.
+            output.push(read_file(util, &file));
+         }
+
+         None =>
+         {
+            error!("Unable to find desired include file:  {:?}",
+                   include_file);
+         }
+      }
+   }
+   else
+   {
+      output.push(processed_line);
+   }
 }
 
 
@@ -13,15 +92,31 @@ pub struct Parser
 impl Parser
 {
    ///
-   pub fn parse(&mut self)
+   pub fn parse(util: &Util, reader: &mut Reader) -> Vec<String>
    {
-   }
+      let mut output: Vec<String>;
 
-   /// Returns true if the next set of characters starts with
+      // Create a new set of lines to hold the parsed data.
-   /// the given pattern; Otherwise, false.
+      output = Vec::new();
-   pub fn starts_with<P>(&self, pattern: P) -> bool
+
-      where P: AsRef<str>
+      // Start parsing all the given lines.
-   {
+      while reader.is_eob() == false
-      self.position >= self.input.len()
+      {
+         match reader.consume_line()
+         {
+            Ok(line) =>
+            {
+               process_line(util, &mut output, line)
+            }
+
+            Err(error) =>
+            {
+               error!("{}", error);
+            }
+         }
+      }
+
+      // Return the parsed input.
+      output
    }
 }

src/reader.rs

@@ -129,12 +129,15 @@ impl Reader
    /// Get the current character.
    pub fn get_char(&self) -> Result<char, &'static str>
    {
-      if self.is_eof() == false
+      // Make sure we are not at the end of the buffer.
+      if self.is_eob() == false
       {
+         // Return the character at the current position.
          Ok(self.buffer[self.position])
       }
       else
       {
+         // There was an error.
          Err("Unable to read character. \
               No characters left in the input buffer.")
       }
@@ -146,15 +149,76 @@ impl Reader
    {
       let character: char;
 
+      // Get the current character and move the position 
+      // in the buffer forward.
       character = try!(self.get_char());
-
       self.position += 1;
 
+      // Return the character that was retrieved.
       Ok(character)
    }
 
-   ///
+   /// Get a line of text from the current character to the next
-   fn is_eof(&self) -> bool
+   /// newline character, including the current character.
+   pub fn get_line(&mut self) -> Result<String, &'static str>
+   {
+      let mut index: usize;
+      let mut buffer: String;
+
+      // Create a new buffer to hold the line created.
+      buffer = String::new();
+
+      // Now get the current position the reader is at.
+      index = self.position;
+      while index < self.buffer.len() && self.buffer[index] != '\n'
+      {
+         buffer.push(self.buffer[index]);
+         index += 1;
+      }
+
+      // Read the newline character if the reader did not run out of buffer.
+      if index < self.buffer.len() && self.buffer[index] == '\n'
+      {
+         buffer.push(self.buffer[index]);
+      }
+
+      // Return the buffer of characters that was created.
+      Ok(buffer)
+   }
+
+   /// Get a line of text from the current character to the next
+   /// newline character, including the current character and newline.
+   /// This will consume all the characters and move the position
+   /// of the reader.
+   pub fn consume_line(&mut self) -> Result<String, &'static str>
+   {
+      let mut continue_consuming: bool;
+      let mut current_char: char;
+      let mut buffer: String;
+
+      // Create a new buffer to hold the line created.
+      buffer = String::new();
+
+      // Consume all the characters of the line
+      // and add them to the buffer.
+      continue_consuming = true;
+      while continue_consuming == true
+      {
+         current_char = try!(self.consume_char());
+         buffer.push(current_char);
+
+         if current_char == '\n'
+         {
+            continue_consuming = false;
+         }
+      }
+
+      // Return the buffer of characters that was created.
+      Ok(buffer)
+   }
+
+   /// Check to see if we have reached the end of the buffer.
+   pub fn is_eob(&self) -> bool
    {
       self.position >= self.buffer.len()
    }

src/util.rs

@@ -0,0 +1,49 @@
+use std::path::{Path, PathBuf};
+
+
+
+pub struct Util
+{
+   include_directories: Vec<PathBuf>
+}
+
+
+
+impl Util
+{
+   pub fn new() -> Util
+   {
+      Util
+      {
+         include_directories: Vec::new()
+      }
+   }
+
+   pub fn register_include_dir(&mut self, dir: &Path)
+   {
+      let include_dir: PathBuf;
+
+      include_dir = PathBuf::from(dir);
+
+      self.include_directories.push(include_dir);
+   }
+
+   pub fn get_include_file_path(&self, filepath: &Path) -> Option<PathBuf>
+   {
+      let mut path: PathBuf;
+
+      // Loop through and find the first path that exists
+      // when combining it with the paths in the list of include
+      // directories.
+      for dir in self.include_directories.iter()
+      {
+         path = PathBuf::from(dir).join(filepath);
+         if path.exists() == true
+         {
+            return Some(path);
+         }
+      }
+
+      None
+   }
+}