util/Tokenizer: use std::runtime_error on syntax error

src/util/Tokenizer.cxx

@@ -31,10 +31,8 @@
 #include "Tokenizer.hxx"
 #include "CharUtil.hxx"
 #include "StringUtil.hxx"
-#include "Error.hxx"
-#include "Domain.hxx"
 
-static constexpr Domain tokenizer_domain("tokenizer");
+#include <stdexcept>
 
 static inline bool
 valid_word_first_char(char ch)
@@ -49,7 +47,7 @@ valid_word_char(char ch)
 }
 
 char *
-Tokenizer::NextWord(Error &error)
+Tokenizer::NextWord()
 {
 	char *const word = input;
 
@@ -58,10 +56,8 @@ Tokenizer::NextWord(Error &error)
 
 	/* check the first character */
 
-	if (!valid_word_first_char(*input)) {
-		error.Set(tokenizer_domain, "Letter expected");
-		return nullptr;
-	}
+	if (!valid_word_first_char(*input))
+		throw std::runtime_error("Letter expected");
 
 	/* now iterate over the other characters until we find a
 	   whitespace or end-of-string */
@@ -75,10 +71,8 @@ Tokenizer::NextWord(Error &error)
 			break;
 		}
 
-		if (!valid_word_char(*input)) {
-			error.Set(tokenizer_domain, "Invalid word character");
-			return nullptr;
-		}
+		if (!valid_word_char(*input))
+			throw std::runtime_error("Invalid word character");
 	}
 
 	/* end of string: the string is already null-terminated
@@ -94,7 +88,7 @@ valid_unquoted_char(char ch)
 }
 
 char *
-Tokenizer::NextUnquoted(Error &error)
+Tokenizer::NextUnquoted()
 {
 	char *const word = input;
 
@@ -103,10 +97,8 @@ Tokenizer::NextUnquoted(Error &error)
 
 	/* check the first character */
 
-	if (!valid_unquoted_char(*input)) {
-		error.Set(tokenizer_domain, "Invalid unquoted character");
-		return nullptr;
-	}
+	if (!valid_unquoted_char(*input))
+		throw std::runtime_error("Invalid unquoted character");
 
 	/* now iterate over the other characters until we find a
 	   whitespace or end-of-string */
@@ -120,11 +112,8 @@ Tokenizer::NextUnquoted(Error &error)
 			break;
 		}
 
-		if (!valid_unquoted_char(*input)) {
-			error.Set(tokenizer_domain,
-				  "Invalid unquoted character");
-			return nullptr;
-		}
+		if (!valid_unquoted_char(*input))
+			throw std::runtime_error("Invalid unquoted character");
 	}
 
 	/* end of string: the string is already null-terminated
@@ -134,7 +123,7 @@ Tokenizer::NextUnquoted(Error &error)
 }
 
 char *
-Tokenizer::NextString(Error &error)
+Tokenizer::NextString()
 {
 	char *const word = input, *dest = input;
 
@@ -144,10 +133,8 @@ Tokenizer::NextString(Error &error)
 
 	/* check for the opening " */
 
-	if (*input != '"') {
-		error.Set(tokenizer_domain, "'\"' expected");
-		return nullptr;
-	}
+	if (*input != '"')
+		throw std::runtime_error("'\"' expected");
 
 	++input;
 
@@ -159,14 +146,8 @@ Tokenizer::NextString(Error &error)
 			   character */
 			++input;
 
-		if (*input == 0) {
-			/* return input-1 so the caller can see the
-			   difference between "end of line" and
-			   "error" */
-			--input;
-			error.Set(tokenizer_domain, "Missing closing '\"'");
-			return nullptr;
-		}
+		if (*input == 0)
+			throw std::runtime_error("Missing closing '\"'");
 
 		/* copy one character */
 		*dest++ = *input++;
@@ -176,11 +157,8 @@ Tokenizer::NextString(Error &error)
 	   line) */
 
 	++input;
-	if (!IsWhitespaceFast(*input)) {
-		error.Set(tokenizer_domain,
-			  "Space expected after closing '\"'");
-		return nullptr;
-	}
+	if (!IsWhitespaceFast(*input))
+		throw std::runtime_error("Space expected after closing '\"'");
 
 	/* finish the string and return it */
 
@@ -190,10 +168,10 @@ Tokenizer::NextString(Error &error)
 }
 
 char *
-Tokenizer::NextParam(Error &error)
+Tokenizer::NextParam()
 {
 	if (*input == '"')
-		return NextString(error);
+		return NextString();
 	else
-		return NextUnquoted(error);
+		return NextUnquoted();
 }

src/util/Tokenizer.hxx

@@ -30,8 +30,6 @@
 #ifndef TOKENIZER_HXX
 #define TOKENIZER_HXX
 
-class Error;
-
 class Tokenizer {
 	char *input;
 
@@ -58,50 +56,42 @@ public:
 	}
 
 	/**
-	 * Reads the next word.
+	 * Reads the next word.  Throws std::runtime_error on error.
 	 *
-	 * @param error if this function returns nullptr and
-	 * **input_p!=0, it provides an #Error object in
-	 * this argument
 	 * @return a pointer to the null-terminated word, or nullptr
-	 * on error or end of line
+	 * on end of line
 	 */
-	char *NextWord(Error &error);
+	char *NextWord();
 
 	/**
-	 * Reads the next unquoted word from the input string.
+	 * Reads the next unquoted word from the input string.  Throws
+	 * std::runtime_error on error.
 	 *
-	 * @param error if this function returns nullptr and **input_p!=0, it
-	 * provides an #Error object in this argument
 	 * @return a pointer to the null-terminated word, or nullptr
-	 * on error or end of line
+	 * on end of line
 	 */
-	char *NextUnquoted(Error &error);
+	char *NextUnquoted();
 
 	/**
-	 * Reads the next quoted string from the input string.  A backslash
-	 * escapes the following character.  This function modifies the input
-	 * string.
+	 * Reads the next quoted string from the input string.  A
+	 * backslash escapes the following character.  This function
+	 * modifies the input string.  Throws std::runtime_error on
+	 * error.
 	 *
-	 * @param error if this function returns nullptr and **input_p!=0, it
-	 * provides an #Error object in this argument
-	 * @return a pointer to the null-terminated string, or nullptr on error
-	 * or end of line
+	 * @return a pointer to the null-terminated string, or nullptr
+	 * end of line
 	 */
-	char *NextString(Error &error);
+	char *NextString();
 
 	/**
 	 * Reads the next unquoted word or quoted string from the
 	 * input.  This is a wrapper for NextUnquoted() and
-	 * NextString().
+	 * NextString().  Throws std::runtime_error on error.
 	 *
-	 * @param error if this function returns nullptr and
-	 * **input_p!=0, it provides an #Error object in
-	 * this argument
 	 * @return a pointer to the null-terminated string, or nullptr
-	 * on error or end of line
+	 * on end of line
 	 */
-	char *NextParam(Error &error);
+	char *NextParam();
 };
 
 #endif