Merge escape.jl into strio.jl, both base and test

Author: ScottPJones

base/string.jl

@@ -2,7 +2,6 @@
 
 include("strings/basic.jl")
 include("strings/search.jl")
-include("strings/escape.jl")
 include("strings/parse.jl")
 include("strings/strutil.jl")
 include("strings/cstring.jl")

base/strings/escape.jl

@@ -86,6 +86,113 @@ print_joined(io, strings) = print_joined(io, strings, "")
 
 join(args...) = sprint(print_joined, args...)
 
+## string escaping & unescaping ##
+
+escape_nul(s::AbstractString, i::Int) =
+    !done(s,i) && '0' <= next(s,i)[1] <= '7' ? "\\x00" : "\\0"
+
+function print_escaped(io, s::AbstractString, esc::AbstractString)
+    i = start(s)
+    while !done(s,i)
+        c, j = next(s,i)
+        c == '\0'       ? print(io, escape_nul(s,j)) :
+        c == '\e'       ? print(io, "\\e") :
+        c == '\\'       ? print(io, "\\\\") :
+        c in esc        ? print(io, '\\', c) :
+        '\a' <= c <= '\r' ? print(io, '\\', "abtnvfr"[Int(c)-6]) :
+        isprint(c)      ? print(io, c) :
+        c <= '\x7f'     ? print(io, "\\x", hex(c, 2)) :
+        c <= '\uffff'   ? print(io, "\\u", hex(c, need_full_hex(s,j) ? 4 : 2)) :
+                          print(io, "\\U", hex(c, need_full_hex(s,j) ? 8 : 4))
+        i = j
+    end
+end
+
+escape_string(s::AbstractString) = sprint(endof(s), print_escaped, s, "\"")
+function print_quoted(io, s::AbstractString)
+    print(io, '"')
+    print_escaped(io, s, "\"\$") #"# work around syntax highlighting problem
+    print(io, '"')
+end
+
+# bare minimum unescaping function unescapes only given characters
+
+function print_unescaped_chars(io, s::AbstractString, esc::AbstractString)
+    if !('\\' in esc)
+        esc = string("\\", esc)
+    end
+    i = start(s)
+    while !done(s,i)
+        c, i = next(s,i)
+        if c == '\\' && !done(s,i) && s[i] in esc
+            c, i = next(s,i)
+        end
+        print(io, c)
+    end
+end
+
+unescape_chars(s::AbstractString, esc::AbstractString) =
+    sprint(endof(s), print_unescaped_chars, s, esc)
+
+# general unescaping of traditional C and Unicode escape sequences
+
+function print_unescaped(io, s::AbstractString)
+    i = start(s)
+    while !done(s,i)
+        c, i = next(s,i)
+        if !done(s,i) && c == '\\'
+            c, i = next(s,i)
+            if c == 'x' || c == 'u' || c == 'U'
+                n = k = 0
+                m = c == 'x' ? 2 :
+                    c == 'u' ? 4 : 8
+                while (k+=1) <= m && !done(s,i)
+                    c, j = next(s,i)
+                    n = '0' <= c <= '9' ? n<<4 + c-'0' :
+                        'a' <= c <= 'f' ? n<<4 + c-'a'+10 :
+                        'A' <= c <= 'F' ? n<<4 + c-'A'+10 : break
+                    i = j
+                end
+                if k == 1
+                    throw(ArgumentError("\\x used with no following hex digits in $(repr(s))"))
+                end
+                if m == 2 # \x escape sequence
+                    write(io, UInt8(n))
+                else
+                    print(io, Char(n))
+                end
+            elseif '0' <= c <= '7'
+                k = 1
+                n = c-'0'
+                while (k+=1) <= 3 && !done(s,i)
+                    c, j = next(s,i)
+                    n = ('0' <= c <= '7') ? n<<3 + c-'0' : break
+                    i = j
+                end
+                if n > 255
+                    throw(ArgumentError("octal escape sequence out of range"))
+                end
+                write(io, UInt8(n))
+            else
+                print(io, c == 'a' ? '\a' :
+                          c == 'b' ? '\b' :
+                          c == 't' ? '\t' :
+                          c == 'n' ? '\n' :
+                          c == 'v' ? '\v' :
+                          c == 'f' ? '\f' :
+                          c == 'r' ? '\r' :
+                          c == 'e' ? '\e' : c)
+            end
+        else
+            print(io, c)
+        end
+    end
+end
+
+unescape_string(s::AbstractString) = sprint(endof(s), print_unescaped, s)
+
+macro b_str(s); :($(unescape_string(s)).data); end
+
 ## Count indentation, unindent ##
 
 function blank_width(c::Char)

base/strings/strio.jl

@@ -2,7 +2,6 @@
 
 include("strings/basic.jl")
 include("strings/search.jl")
-include("strings/escape.jl")
 include("strings/parse.jl")
 include("strings/strutil.jl")
 include("strings/cstring.jl")