Clean up text handling a bit:

- Rename IO.write -> IO.print.
- Make IO.write not print a newline.
- Support \u Unicode escapes in strings.

test/string/contains.wren

@@ -1,6 +1,6 @@
-IO.write("".contains(""))              // expect: true
-IO.write("anything".contains(""))      // expect: true
-IO.write("something".contains("meth")) // expect: true
-IO.write("something".contains("some")) // expect: true
-IO.write("something".contains("ing"))  // expect: true
-IO.write("something".contains("math")) // expect: false
+IO.print("".contains(""))              // expect: true
+IO.print("anything".contains(""))      // expect: true
+IO.print("something".contains("meth")) // expect: true
+IO.print("something".contains("some")) // expect: true
+IO.print("something".contains("ing"))  // expect: true
+IO.print("something".contains("math")) // expect: false

test/string/count.wren

@@ -1,2 +1,2 @@
-IO.write("".count)   // expect: 0
-IO.write("a string".count) // expect: 8
+IO.print("".count)   // expect: 0
+IO.print("a string".count) // expect: 8

test/string/equality.wren

@@ -1,19 +1,19 @@
-IO.write("" == "")          // expect: true
-IO.write("abcd" == "abcd")  // expect: true
-IO.write("abcd" == "d")     // expect: false
-IO.write("e" == "abcd")     // expect: false
-IO.write("" == "abcd")      // expect: false
+IO.print("" == "")          // expect: true
+IO.print("abcd" == "abcd")  // expect: true
+IO.print("abcd" == "d")     // expect: false
+IO.print("e" == "abcd")     // expect: false
+IO.print("" == "abcd")      // expect: false
 
 // Not equal to other types.
-IO.write("1" == 1)        // expect: false
-IO.write("true" == true)  // expect: false
+IO.print("1" == 1)        // expect: false
+IO.print("true" == true)  // expect: false
 
-IO.write("" != "")          // expect: false
-IO.write("abcd" != "abcd")  // expect: false
-IO.write("abcd" != "d")     // expect: true
-IO.write("e" != "abcd")     // expect: true
-IO.write("" != "abcd")      // expect: true
+IO.print("" != "")          // expect: false
+IO.print("abcd" != "abcd")  // expect: false
+IO.print("abcd" != "d")     // expect: true
+IO.print("e" != "abcd")     // expect: true
+IO.print("" != "abcd")      // expect: true
 
 // Not equal to other types.
-IO.write("1" != 1)        // expect: true
-IO.write("true" != true)  // expect: true
+IO.print("1" != 1)        // expect: true
+IO.print("true" != true)  // expect: true

test/string/escapes.wren

@@ -1,8 +1,7 @@
 // Escape characters.
-IO.write("\"")     // expect: "
-IO.write("\\")     // expect: \
-IO.write("(\n)")   // expect: (
+IO.print("\"")     // expect: "
+IO.print("\\")     // expect: \
+IO.print("(\n)")   // expect: (
                    // expect: )
 
 // TODO: Non-printing escapes like \t.
-// TODO: Unicode escape sequences.

test/string/literals.wren

@@ -1,2 +1,2 @@
-IO.write("".count)   // expect: 0
-IO.write("a string") // expect: a string
+IO.print("".count)   // expect: 0
+IO.print("a string") // expect: a string

test/string/subscript.wren

@@ -1,11 +1,11 @@
 // Returns characters (as strings).
-IO.write("abcd"[0]) // expect: a
-IO.write("abcd"[1]) // expect: b
-IO.write("abcd"[2]) // expect: c
-IO.write("abcd"[3]) // expect: d
+IO.print("abcd"[0]) // expect: a
+IO.print("abcd"[1]) // expect: b
+IO.print("abcd"[2]) // expect: c
+IO.print("abcd"[3]) // expect: d
 
 // Allows indexing backwards from the end.
-IO.write("abcd"[-4]) // expect: a
-IO.write("abcd"[-3]) // expect: b
-IO.write("abcd"[-2]) // expect: c
-IO.write("abcd"[-1]) // expect: d
+IO.print("abcd"[-4]) // expect: a
+IO.print("abcd"[-3]) // expect: b
+IO.print("abcd"[-2]) // expect: c
+IO.print("abcd"[-1]) // expect: d

test/string/to_string.wren

@@ -1,2 +1,2 @@
-IO.write("".toString == "") // expect: true
-IO.write("blah".toString == "blah") // expect: true
+IO.print("".toString == "") // expect: true
+IO.print("blah".toString == "blah") // expect: true

test/string/type.wren

@@ -1,4 +1,4 @@
-IO.write("s" is String)      // expect: true
-IO.write("s" is Object)      // expect: true
-IO.write("s" is Num)         // expect: false
-IO.write("s".type == String) // expect: true
+IO.print("s" is String)      // expect: true
+IO.print("s" is Object)      // expect: true
+IO.print("s" is Num)         // expect: false
+IO.print("s".type == String) // expect: true

test/string/unicode_escapes.wren

@@ -0,0 +1,18 @@
+// One byte UTF-8 Sequences.
+IO.print("\u0041")     // expect: A
+IO.print("\u007e")     // expect: ~
+
+// Two byte sequences.
+IO.print("\u00b6")     // expect: ¶
+IO.print("\u00de")     // expect: Þ
+
+// Three byte sequences.
+IO.print("\u0950")     // expect: ॐ
+IO.print("\u0b83")     // expect: ஃ
+
+// Capitalized hex.
+IO.print("\u00B6")     // expect: ¶
+IO.print("\u00DE")     // expect: Þ
+
+// TODO: Missing digits in escape.
+// TODO: Syntax for Unicode escapes > 0xffff?