-- major tests for text editing flows function test_initial_state() App.screen.init{width=120, height=60} Editor_state = edit.initialize_test_state() Editor_state.lines = load_array{} Text.redraw_all(Editor_state) edit.draw(Editor_state) check_eq(#Editor_state.lines, 1, '#lines') check_eq(Editor_state.cursor1.line, 1, 'cursor:line') check_eq(Editor_state.cursor1.pos, 1, 'cursor:pos') check_eq(Editor_state.screen_top1.line, 1, 'screen_top:line') check_eq(Editor_state.screen_top1.pos, 1, 'screen_top:pos') end function test_backspace_from_start_of_final_line() -- display final line of text with cursor at start of it App.screen.init{width=120, height=60} Editor_state = edit.initialize_test_state() Editor_state.lines = load_array{'abc', 'def'} Editor_state.screen_top1 = {line=2, pos=1} Editor_state.cursor1 = {line=2, pos=1} Text.redraw_all(Editor_state) -- backspace scrolls up edit.run_after_keychord(Editor_state, 'backspace') check_eq(#Editor_state.lines, 1, '#lines') check_eq(Editor_state.cursor1.line, 1, 'cursor') check_eq(Editor_state.screen_top1.line, 1, 'screen_top') end function test_insert_first_character() App.screen.init{width=120, height=60} Editor_state = edit.initialize_test_state() Editor_state.lines = load_array{} Text.redraw_all(Editor_state) edit.draw(Editor_state) edit.run_after_text_input(Editor_state, 'a') local y = Editor_state.top App.screen.check(y, 'a', 'screen:1') end function test_press_ctrl() -- press ctrl while the cursor is on text App.screen.init{width=50, height=80} Editor_state = edit.initialize_test_state() Editor_state.lines = load_array{''} Text.redraw_all(Editor_state) Editor_state.cursor1 = {line=1, pos=1} Editor_state.screen_top1 = {line=1, pos=1} Editor_state.screen_bottom1 = {} edit.run_after_keychord(Editor_state, 'C-m') end function test_move_left() App.screen.init{width=120, height=60} Editor_state = edit.initialize_test_state() Editor_state.lines = load_array{'a'} Text.redraw_all(Editor_state) Editor_state.cursor1 = {line=1, pos=2} edit.draw(Editor_state) edit.run_after_keychord(Editor_state, 'left') check_eq(Editor_state.cursor1.pos, 1, 'check') end function test_move_right() App.screen.init{width=120, height=60} Editor_state = edit.initialize_test_state() Editor_state.lines = load_array{'a'} Text.redraw_all(Editor_state) Editor_state.cursor1 = {line=1, pos=1} edit.draw(Editor_state) edit.run_after_keychord(Editor_state, 'right') check_eq(Editor_state.cursor1.pos, 2, 'check') end function test_move_left_to_previous_line() App.screen.init{width=120, height=60} Editor_state = edit.initialize_test_state() Editor_state.lines = load_array{'abc', 'def'} Text.redraw_all(Editor_state) Editor_state.cursor1 = {line=2, pos=1} edit.draw(Editor_state) edit.run_after_keychord(Editor_state, 'left') check_eq(Editor_state.cursor1.line, 1, 'line') check_eq(Editor_state.cursor1.pos, 4, 'pos') -- past end of line end function test_move_right_to_next_line() App.screen.init{width=120, height=60} Editor_state = edit.initialize_test_state() Editor_state.lines = load_array{'abc', 'def'} Text.redraw_all(Editor_state) Editor_state.cursor1 = {line=1, pos=4} -- past end of line edit.draw(Editor_state) edit.run_after_keychord(Editor_state, 'right') check_eq(Editor_state.cursor1.line, 2, 'line') check_eq(Editor_state.cursor1.pos, 1, 'pos') end function test_move_to_start_of_word() App.screen.init{width=120, height=60} Editor_state = edit.initialize_test_state() Editor_state.lines = load_array{'abc'} Text.redraw_all(Editor_state) Editor_state.cursor1 = {line=1, pos=3} edit.draw(Editor_state) edit.run_after_keychord(Editor_state, 'M-left') check_eq(Editor_state.cursor1.pos, 1, 'check') end function test_move_to_start_of_previous_word() App.screen.init{width=120, height=60} Editor_state = edit.initialize_test_state() Editor_state.lines = load_array{'abc def'} Text.redraw_all(Editor_state) Editor_state.cursor1 = {line=1, pos=4} -- at the space between words edit.draw(Editor_state) edit.run_after_keychord(Editor_state, 'M-left') check_eq(Editor_state.cursor1.pos, 1, 'check') end function test_skip_to_previous_word() App.screen.init{width=120, height=60} Editor_state = edit.initialize_test_state() Editor_state.lines = load_array{'abc def'} Text.redraw_all(Editor_state) Editor_state.cursor1 = {line=1, pos=5} -- at the start of second word edit.draw(Editor_state) edit.run_after_keychord(Editor_state, 'M-left') check_eq(Editor_state.cursor1.pos, 1, 'check') end function test_skip_past_tab_to_previous_word() App.screen.init{width=120, height=60} Editor_state = edit.initialize_test_state() Editor_state.lines = load_array{'abc def\tghi'} Text.redraw_all(Editor_state) Editor_state.cursor1 = {line=1, pos=10} -- within third word edit.draw(Editor_state) edit.run_after_keychord(Editor_state, 'M-left') check_eq(Editor_state.cursor1.pos, 9, 'check') end function test_skip_multiple_spaces_to_previous_word() App.screen.init{width=120, height=60} Editor_state = edit.initialize_test_state() Editor_state.lines = load_array{'abc def'} Text.redraw_all(Editor_state) Editor_state.cursor1 = {line=1, pos=6} -- at the start of second word edit.draw(Editor_state) edit.run_after_keychord(Editor_state, 'M-left') check_eq(Editor_state.cursor1.pos, 1, 'check') end function test_move_to_start_of_word_on_previous_line() App.screen.init{width=120, height=60} Editor_state = edit.initialize_test_state() Editor_state.lines = load_array{'abc def', 'ghi'} Text.redraw_all(Editor_state) Editor_state.cursor1 = {line=2, pos=1} edit.draw(Editor_state) edit.run_after_keychord(Editor_state, 'M-left') check_eq(Editor_state.cursor1.line, 1, 'line') check_eq(Editor_state.cursor1.pos, 5, 'pos') end function test_move_past_end_of_word() App.screen.init{width=120, height=60} Editor_state = edit.initialize_test_state() Editor_state.lines = load_array{'abc def'} Text.redraw_all(Editor_state) Editor_state.cursor1 = {line=1, pos=1} edit.draw(Editor_state) edit.run_after_keychord(Editor_state, 'M-right') check_eq(Editor_state.cursor1.pos, 4, 'check') end function test_skip_to_next_word() App.screen.init{width=120, height=60} Editor_state = edit.initialize_test_state() Editor_state.lines = load_array{'abc def'} Text.redraw_all(Editor_state) Editor_state.cursor1 = {line=1, pos=4} -- at the space between words edit.draw(Editor_state) edit.run_after_keychord(Editor_state, 'M-right') check_eq(Editor_state.cursor1.pos, 8, 'check') end function test_skip_past_tab_to_next_word() App.screen.init{width=120, height=60} Editor_state = edit.initialize_test_state() Editor_state.lines = load_array{'abc\tdef'} Text.redraw_all(Editor_state) Editor_state.cursor1 = {line=1, pos=1} -- at the space between words edit.draw(Editor_state) edit.run_after_keychord(Editor_state, 'M-right') check_eq(Editor_state.cursor1.pos, 4, 'check') end function test_skip_multiple_spaces_to_next_word() App.screen.init{width=120, height=60} Editor_state = edit.initialize_test_state() Editor_state.lines = load_array{'abc def'} Text.redraw_all(Editor_state) Editor_state.cursor1 = {line=1, pos=4} -- at the start of second word edit.draw(Editor_state) edit.run_after_keychord(Editor_state, 'M-right') check_eq(Editor_state.cursor1.pos, 9, 'check') end function test_move_past_end_of_word_on_next_line() App.screen.init{width=120, height=60} Editor_state = edit.initialize_test_state() Editor_state.lines = load_array{'abc def', 'ghi'} Text.redraw_all(Editor_state) Editor_state.cursor1 = {line=1, pos=8} edit.draw(Editor_state) edit.run_after_keychord(Editor_state, 'M-right') check_eq(Editor_state.cursor1.line, 2, 'line') check_eq(Editor_state.cursor1.pos, 4, 'pos') end function test_click_moves_cursor() App.screen.init{width=50, height=60} Editor_state = edit.initialize_test_state() Editor_state.lines = load_array{'abc', 'def', 'xyz'} Text.redraw_all(Editor_state) Editor_state.cursor1 = {line=1, pos=1} Editor_state.screen_top1 = {line=1, pos=1} Editor_state.screen_bottom1 = {} Editor_state.selection1 = {} edit.draw(Editor_state) -- populate line_cache.starty for each line Editor_state.line_cache ed
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Mu - linux/119error-byte.subx</title>
<meta name="Generator" content="Vim/8.1">
<meta name="plugin-version" content="vim8.1_v1">
<meta name="syntax" content="none">
<meta name="settings" content="number_lines,use_css,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
<meta name="colorscheme" content="minimal-dark">
<style type="text/css">
<!--
pre { font-family: monospace; color: #000000; background-color: #a8a8a8; }
body { font-size:12pt; font-family: monospace; color: #000000; background-color: #a8a8a8; }
a { color:inherit; }
* { font-size:12pt; font-size: 1em; }
.SpecialChar { color: #d70000; }
.subxComment { color: #005faf; }
.subxS1Comment { color: #0000af; }
.subxS2Comment { color: #8a8a8a; }
.LineNr { }
.Constant { color: #008787; }
.subxFunction { color: #af5f00; text-decoration: underline; }
.Normal { color: #000000; background-color: #a8a8a8; padding-bottom: 1px; }
.CommentedCode { color: #8a8a8a; }
-->
</style>

<script type='text/javascript'>
<!--

/* function to open any folds containing a jumped-to line before jumping to it */
function JumpToLine()
{
  var lineNum;
  lineNum = window.location.hash;
  lineNum = lineNum.substr(1); /* strip off '#' */

  if (lineNum.indexOf('L') == -1) {
    lineNum = 'L'+lineNum;
  }
  var lineElem = document.getElementById(lineNum);
  /* Always jump to new location even if the line was hidden inside a fold, or
   * we corrected the raw number to a line ID.
   */
  if (lineElem) {
    lineElem.scrollIntoView(true);
  }
  return true;
}
if ('onhashchange' in window) {
  window.onhashchange = JumpToLine;
}

-->
</script>
</head>
<body onload='JumpToLine();'>
<a href='https://github.com/akkartik/mu/blob/main/linux/119error-byte.subx'>https://github.com/akkartik/mu/blob/main/linux/119error-byte.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Print an error message followed by the text representation of a byte. Then exit.</span>
<span id="L2" class="LineNr"> 2 </span>
<span id="L3" class="LineNr"> 3 </span>== code
<span id="L4" class="LineNr"> 4 </span><span class="subxComment">#   instruction                     effective address                                                   register    displacement    immediate</span>
<span id="L5" class="LineNr"> 5 </span><span class="subxS1Comment"># . op          subop               mod             rm32          base        index         scale       r32</span>
<span id="L6" class="LineNr"> 6 </span><span class="subxS1Comment"># . 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes</span>
<span id="L7" class="LineNr"> 7 </span>
<span id="L8" class="LineNr"> 8 </span><span class="CommentedCode">#? Entry:  # manual test</span>
<span id="L9" class="LineNr"> 9 </span><span class="CommentedCode">#?     # . var ed/eax: exit-descriptor</span>
<span id="L10" class="LineNr">10 </span><span class="CommentedCode">#?     81          5/subop/subtract    3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # subtract from esp</span>
<span id="L11" class="LineNr">11 </span><span class="CommentedCode">#?     89/copy                         3/mod/direct    0/rm32/eax    .           .             .           4/r32/esp   .               .                 # copy esp to eax</span>
<span id="L12" class="LineNr">12 </span><span class="CommentedCode">#?     # . configure ed to really exit()</span>
<span id="L13" class="LineNr">13 </span><span class="CommentedCode">#?     # . . ed-&gt;target = 0</span>
<span id="L14" class="LineNr">14 </span><span class="CommentedCode">#?     c7          0/subop/copy        0/mod/direct    0/rm32/eax    .           .             .           .           .               0/imm32           # copy to *eax</span>
<span id="L15" class="LineNr">15 </span><span class="CommentedCode">#?     # . error-byte(ed, Stdout, msg, 34)</span>
<span id="L16" class="LineNr">16 </span><span class="CommentedCode">#?     68/push  0x34/imm32</span>
<span id="L17" class="LineNr">17 </span><span class="CommentedCode">#?     68/push  &quot;abc&quot;/imm32</span>
<span id="L18" class="LineNr">18 </span><span class="CommentedCode">#?     68/push  Stderr/imm32</span>
<span id="L19" class="LineNr">19 </span><span class="CommentedCode">#?     50/push-eax</span>
<span id="L20" class="LineNr">20 </span><span class="CommentedCode">#?     e8/call  error-byte/disp32</span>
<span id="L21" class="LineNr">21 </span><span class="CommentedCode">#?     # . syscall(exit, Num-test-failures)</span>
<span id="L22" class="LineNr">22 </span><span class="CommentedCode">#?     8b/copy                         0/mod/indirect  5/rm32/.disp32            .             .           3/r32/ebx   Num-test-failures/disp32          # copy *Num-test-failures to ebx</span>
<span id="L23" class="LineNr">23 </span><span class="CommentedCode">#?     e8/call  syscall_exit/disp32</span>
<span id="L24" class="LineNr">24 </span>
<span id="L25" class="LineNr">25 </span><span class="subxComment"># write(out, &quot;Error: &quot;+msg+&quot;: &quot;+byte) then stop(ed, 1)</span>
<span id="L26" class="LineNr">26 </span><span class="subxFunction">error-byte</span>:  <span class="subxComment"># ed: (addr exit-descriptor), out: (addr buffered-file), msg: (addr array byte), n: byte</span>
<span id="L27" class="LineNr">27 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L28" class="LineNr">28 </span>    55/push-ebp
<span id="L29" class="LineNr">29 </span>    89/copy                         3/mod/direct    5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          4/r32/esp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy esp to ebp</span>
<span id="L30" class="LineNr">30 </span>    <span class="subxComment"># write-buffered(out, &quot;Error: &quot;)</span>
<span id="L31" class="LineNr">31 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L32" class="LineNr">32 </span>    68/push  <span class="Constant">&quot;Error: &quot;</span>/imm32
<span id="L33" class="LineNr">33 </span>    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+12)</span>
<span id="L34" class="LineNr">34 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L35" class="LineNr">35 </span>    e8/call  <a href='116write-buffered.subx.html#L8'>write-buffered</a>/disp32
<span id="L36" class="LineNr">36 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L37" class="LineNr">37 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              8/imm32           <span class="subxComment"># add to esp</span>
<span id="L38" class="LineNr">38 </span>    <span class="subxComment"># write-buffered(out, msg)</span>
<span id="L39" class="LineNr">39 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L40" class="LineNr">40 </span>    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          0x10/disp8     <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+16)</span>
<span id="L41" class="LineNr">41 </span>    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+12)</span>
<span id="L42" class="LineNr">42 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L43" class="LineNr">43 </span>    e8/call  <a href='116write-buffered.subx.html#L8'>write-buffered</a>/disp32
<span id="L44" class="LineNr">44 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L45" class="LineNr">45 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              8/imm32           <span class="subxComment"># add to esp</span>
<span id="L46" class="LineNr">46 </span>    <span class="subxComment"># write-buffered(out, &quot;: &quot;)</span>
<span id="L47" class="LineNr">47 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L48" class="LineNr">48 </span>    68/push  <span class="Constant">&quot;: &quot;</span>/imm32
<span id="L49" class="LineNr">49 </span>    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+12)</span>
<span id="L50" class="LineNr">50 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L51" class="LineNr">51 </span>    e8/call  <a href='116write-buffered.subx.html#L8'>write-buffered</a>/disp32
<span id="L52" class="LineNr">52 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L53" class="LineNr">53 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              8/imm32           <span class="subxComment"># add to esp</span>
<span id="L54" class="LineNr">54 </span>    <span class="subxComment"># write-byte-hex-buffered(out, byte)</span>
<span id="L55" class="LineNr">55 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L56" class="LineNr">56 </span>    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          0x14/disp8     <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+20)</span>
<span id="L57" class="LineNr">57 </span>    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+12)</span>
<span id="L58" class="LineNr">58 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L59" class="LineNr">59 </span>    e8/call  <a href='117write-int-hex.subx.html#L93'>write-byte-hex-buffered</a>/disp32
<span id="L60" class="LineNr">60 </span>    <span class="subxS2Comment"># . . discard args&