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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html><head><title>Python: package ranger.ext</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head><body bgcolor="#f0f0f8">

<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="heading">
<tr bgcolor="#7799ee">
<td valign=bottom>&nbsp;<br>
<font color="#ffffff" face="helvetica, arial">&nbsp;<br><big><big><strong><a href="ranger.html"><font color="#ffffff">ranger</font></a>.ext</strong></big></big></font></td
><td align=right valign=bottom
><font color="#ffffff" face="helvetica, arial"><a href=".">index</a><br><a href="file:/home/hut/work/ranger/ranger/ext/__init__.py">/home/hut/work/ranger/ranger/ext/__init__.py</a></font></td></tr></table>
    <p><tt>This&nbsp;package&nbsp;includes&nbsp;extensions&nbsp;with&nbsp;broader&nbsp;usability</tt></p>
<p>
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#aa55cc">
<td colspan=3 valign=bottom>&nbsp;<br>
<font color="#ffffff" face="helvetica, arial"><big><strong>Package Contents</strong></big></font></td></tr>
    
<tr><td bgcolor="#aa55cc"><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</tt></td><td>&nbsp;</td>
<td width="100%"><table width="100%" summary="list"><tr><td width="25%" valign=top><a href="ranger.ext.accumulator.html">accumulator</a><br>
<a href="ranger.ext.debug.html">debug</a><br>
</td><td width="25%" valign=top><a href="ranger.ext.get_all_modules.html">get_all_modules</a><br>
<a href="ranger.ext.human_readable.html">human_readable</a><br>
</td><td width="25%" valign=top><a href="ranger.ext.openstruct.html">openstruct</a><br>
<a href="ranger.ext.relpath.html">relpath</a><br>
</td><td width="25%" valign=top><a href="ranger.ext.shutil_generatorized.html">shutil_generatorized</a><br>
<a href="ranger.ext.waitpid_no_intr.html">waitpid_no_intr</a><br>
</td></tr></table></td></tr></table>
</body></html>
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# new type to help incrementally scan arrays
container stream:_elem [
  index:num
  data:&:@:_elem
]

def new-stream s:&:@:_elem -> result:&:stream:_elem [
  local-scope
  load-inputs
  return-unless s, null
  result <- new {(stream _elem): type}
  *result <- put *result, index:offset, 0
  *result <- put *result, data:offset, s
]

def rewind in:&:stream:_elem -> in:&:stream:_elem [
  local-scope
  load-inputs
  return-unless in
  *in <- put *in, index:offset, 0
]

def read in:&:stream:_elem -> result:_elem, empty?:bool, in:&:stream:_elem [
  local-scope
  load-inputs
  assert in, [cannot read; stream has no data]
  empty? <- copy false
  idx:num <- get *in, index:offset
  s:&:@:_elem <- get *in, data:offset
  len:num <- length *s
  at-end?:bool <- greater-or-equal idx len
  {
    break-unless at-end?
    empty-result:&:_elem <- new _elem:type
    return *empty-result, true
  }
  result <- index *s, idx
  idx <- add idx, 1
  *in <- put *in, index:offset, idx
]

def peek in:&:stream:_elem -> result:_elem, empty?:bool [
  local-scope
  load-inputs
  assert in, [cannot peek; stream has no data]
  empty?:bool <- copy false
  idx:num <- get *in, index:offset
  s:&:@:_elem <- get *in, data:offset
  len:num <- length *s
  at-end?:bool <- greater-or-equal idx len
  {
    break-unless at-end?
    empty-result:&:_elem <- new _elem:type
    return *empty-result, true
  }
  result <- index *s, idx
]

def read-line in:&:stream:char -> result:text, in:&:stream:char [
  local-scope
  load-inputs
  assert in, [cannot read-line; stream has no data]
  idx:num <- get *in, index:offset
  s:text <- get *in, data:offset
  next-idx:num <- find-next s, 10/newline, idx
  result <- copy-range s, idx, next-idx
  idx <- add next-idx, 1  # skip newline
  # write back
  *in <- put *in, index:offset, idx
]

def end-of-stream? in:&:stream:_elem -> result:bool [
  local-scope
  load-inputs
  assert in, [cannot check end-of-stream?; stream has no data]
  idx:num <- get *in, index:offset
  s:&:@:_elem <- get *in, data:offset
  len:num <- length *s
  result <- greater-or-equal idx, len
]
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