diff options
Diffstat (limited to 'src/library/scala/StringContext.scala')
| -rw-r--r-- | src/library/scala/StringContext.scala | 29 |
1 files changed, 15 insertions, 14 deletions
diff --git a/src/library/scala/StringContext.scala b/src/library/scala/StringContext.scala index 6116547aa2..1b01355108 100644 --- a/src/library/scala/StringContext.scala +++ b/src/library/scala/StringContext.scala @@ -13,7 +13,7 @@ import collection.mutable.ArrayBuffer /** A class to support string interpolation. * This class supports string interpolation as outlined in Scala SIP-11. * It needs to be fully documented once the SIP is accepted. - * + * * @param parts The parts that make up the interpolated string, * without the expressions that get inserted by interpolation. */ @@ -26,13 +26,13 @@ case class StringContext(parts: String*) { * @param `args` The arguments to be checked. * @throws An `IllegalArgumentException` if this is not the case. */ - def checkLengths(args: Any*): Unit = + def checkLengths(args: Any*): Unit = if (parts.length != args.length + 1) throw new IllegalArgumentException("wrong number of arguments for interpolated string") /** The simple string interpolator. - * + * * It inserts its arguments between corresponding parts of the string context. * It also treats standard escape sequences as defined in the Scala specification. * @param `args` The arguments to be inserted into the resulting string. @@ -46,30 +46,30 @@ case class StringContext(parts: String*) { checkLengths(args: _*) val pi = parts.iterator val ai = args.iterator - val bldr = new java.lang.StringBuilder(treatEscapes(pi.next)) + val bldr = new java.lang.StringBuilder(treatEscapes(pi.next())) while (ai.hasNext) { bldr append ai.next - bldr append treatEscapes(pi.next) + bldr append treatEscapes(pi.next()) } bldr.toString } /** The formatted string interpolator. - * + * * It inserts its arguments between corresponding parts of the string context. * It also treats standard escape sequences as defined in the Scala specification. * Finally, if an interpolated expression is followed by a `parts` string * that starts with a formatting specifier, the expression is formatted according to that * specifier. All specifiers allowed in Java format strings are handled, and in the same * way they are treated in Java. - * + * * @param `args` The arguments to be inserted into the resulting string. * @throws An `IllegalArgumentException` * if the number of `parts` in the enclosing `StringContext` does not exceed * the number of arguments `arg` by exactly 1. * @throws A `StringContext.InvalidEscapeException` if a `parts` string contains a backslash (`\`) character * that does not start a valid escape sequence. - * + * * Note: The `f` method works by assembling a format string from all the `parts` strings and using * `java.lang.String.format` to format all arguments with that format string. The format string is * obtained by concatenating all `parts` strings, and performing two transformations: @@ -89,11 +89,12 @@ case class StringContext(parts: String*) { val bldr = new java.lang.StringBuilder val args1 = new ArrayBuffer[Any] def copyString(first: Boolean): Unit = { - val str = treatEscapes(pi.next) + val str = treatEscapes(pi.next()) + val strIsEmpty = str.length == 0 var start = 0 var idx = 0 if (!first) { - if ((str charAt 0) != '%') + if (strIsEmpty || (str charAt 0) != '%') bldr append "%s" idx = 1 } @@ -106,11 +107,11 @@ case class StringContext(parts: String*) { } idx += 1 } - bldr append (str substring (start, idx)) + if (!strIsEmpty) bldr append (str substring (start, idx)) } copyString(first = true) while (pi.hasNext) { - args1 += ai.next + args1 += ai.next() copyString(first = false) } bldr.toString format (args1: _*) @@ -125,14 +126,14 @@ object StringContext { * @param idx The index of the offending backslash character in `str`. */ class InvalidEscapeException(str: String, idx: Int) - extends IllegalArgumentException("invalid escape character at index "+idx+" in \""+str+"\"") + extends IllegalArgumentException("invalid escape character at index "+idx+" in \""+str+"\"") /** Expands standard Scala escape sequences in a string. * Escape sequences are: * control: `\b`, `\t`, `\n`, `\f`, `\r` * escape: `\\`, `\"`, `\'` * octal: `\d` `\dd` `\ddd` where `d` is an octal digit between `0` and `7`. - * + * * @param A string that may contain escape sequences * @return The string with all escape sequences expanded. */ |