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# json_write.tcl --
#
# Commands for the generation of JSON (Java Script Object Notation).
#
# Copyright (c) 2009-2011 Andreas Kupries <andreas_kupries@sourceforge.net>
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
# RCS: @(#) $Id: json_write.tcl,v 1.2 2011/08/24 20:09:44 andreas_kupries Exp $
# ### ### ### ######### ######### #########
## Requisites
package require Tcl 8.5
namespace eval ::json::write {
namespace export \
string array object indented aligned
namespace ensemble create
}
# ### ### ### ######### ######### #########
## API.
proc ::json::write::indented {{bool {}}} {
variable indented
if {[llength [info level 0]] > 2} {
return -code error {wrong # args: should be "json::write indented ?bool?"}
} elseif {[llength [info level 0]] == 2} {
if {![::string is boolean -strict $bool]} {
return -code error "Expected boolean, got \"$bool\""
}
set indented $bool
if {!$indented} {
variable aligned 0
}
}
return $indented
}
proc ::json::write::aligned {{bool {}}} {
variable aligned
if {[llength [info level 0]] > 2} {
return -code error {wrong # args: should be "json::write aligned ?bool?"}
} elseif {[llength [info level 0]] == 2} {
if {![::string is boolean -strict $bool]} {
return -code error "Expected boolean, got \"$bool\""
}
set aligned $bool
if {$aligned} {
variable indented 1
}
}
return $aligned
}
proc ::json::write::string {s} {
variable quotes
return "\"[::string map $quotes $s]\""
}
proc ::json::write::array {args} {
# always compact form.
return "\[[join $args ,]\]"
}
proc ::json::write::object {args} {
# The dict in args maps string keys to json-formatted data. I.e.
# we have to quote the keys, but not the values, as the latter are
# already in the proper format.
variable aligned
variable indented
if {[llength $args] %2 == 1} {
return -code error {wrong # args, expected an even number of arguments}
}
set dict {}
foreach {k v} $args {
lappend dict [string $k] $v
}
if {$aligned} {
set max [MaxKeyLength $dict]
}
if {$indented} {
set content {}
foreach {k v} $dict {
if {$aligned} {
set k [AlignLeft $max $k]
}
if {[::string match *\n* $v]} {
# multi-line value
lappend content " $k : [Indent $v { } 1]"
} else {
# single line value.
lappend content " $k : $v"
}
}
if {[llength $content]} {
return "\{\n[join $content ,\n]\n\}"
} else {
return "\{\}"
}
} else {
# ultra compact form.
set tmp {}
foreach {k v} $dict {
lappend tmp "$k:$v"
}
return "\{[join $tmp ,]\}"
}
}
# ### ### ### ######### ######### #########
## Internals.
proc ::json::write::Indent {text prefix skip} {
set pfx ""
set result {}
foreach line [split $text \n] {
if {!$skip} { set pfx $prefix } else { incr skip -1 }
lappend result ${pfx}$line
}
return [join $result \n]
}
proc ::json::write::MaxKeyLength {dict} {
# Find the max length of the keys in the dictionary.
set lengths 0 ; # This will be the max if the dict is empty, and
# prevents the mathfunc from throwing errors for
# that case.
foreach str [dict keys $dict] {
lappend lengths [::string length $str]
}
return [tcl::mathfunc::max {*}$lengths]
}
proc ::json::write::AlignLeft {fieldlen str} {
return [format %-${fieldlen}s $str]
#return $str[::string repeat { } [expr {$fieldlen - [::string length $str]}]]
}
# ### ### ### ######### ######### #########
namespace eval ::json::write {
# Configuration of the layout to write.
# indented = boolean. objects are indented.
# aligned = boolean. object keys are aligned vertically.
# aligned => indented.
# Combinations of the format specific entries
# I A |
# - - + ---------------------
# 0 0 | Ultracompact (no whitespace, single line)
# 1 0 | Indented
# 0 1 | Not possible, per the implications above.
# 1 1 | Indented + vertically aligned keys
# - - + ---------------------
variable indented 1
variable aligned 1
variable quotes \
[list "\"" "\\\"" \\ \\\\ \b \\b \f \\f \n \\n \r \\r \t \\t \
\x00 \\u0000 \x01 \\u0001 \x02 \\u0002 \x03 \\u0003 \
\x04 \\u0004 \x05 \\u0005 \x06 \\u0006 \x07 \\u0007 \
\x0b \\u000b \x0e \\u000e \x0f \\u000f \x10 \\u0010 \
\x11 \\u0011 \x12 \\u0012 \x13 \\u0013 \x14 \\u0014 \
\x15 \\u0015 \x16 \\u0016 \x17 \\u0017 \x18 \\u0018 \
\x19 \\u0019 \x1a \\u001a \x1b \\u001b \x1c \\u001c \
\x1d \\u001d \x1e \\u001e \x1f \\u001f \x7f \\u007f \
\x80 \\u0080 \x81 \\u0081 \x82 \\u0082 \x83 \\u0083 \
\x84 \\u0084 \x85 \\u0085 \x86 \\u0086 \x87 \\u0087 \
\x88 \\u0088 \x89 \\u0089 \x8a \\u008a \x8b \\u008b \
\x8c \\u008c \x8d \\u008d \x8e \\u008e \x8f \\u008f \
\x90 \\u0090 \x91 \\u0091 \x92 \\u0092 \x93 \\u0093 \
\x94 \\u0094 \x95 \\u0095 \x96 \\u0096 \x97 \\u0097 \
\x98 \\u0098 \x99 \\u0099 \x9a \\u009a \x9b \\u009b \
\x9c \\u009c \x9d \\u009d \x9e \\u009e \x9f \\u009f ]
}
# ### ### ### ######### ######### #########
## Ready
package provide json::write 1.0.3
return
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