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function Tool (span) {
this.lex = new Lex (span)
this.name = span.innerHTML
this.span = span
}
Tool.prototype.use = function(){}
Tool.prototype.focus = function(){
// focused && focused.blur()
current_tool && current_tool.blur()
current_tool = this
this.span.classList.add('focused')
this.use()
}
Tool.prototype.blur = function(){
current_tool = null
this.span.classList.remove('focused')
}
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