assets/javascripts/codemirror/keymap/emacs.js
(function() {
"use strict";
var Pos = CodeMirror.Pos;
function posEq(a, b) { return a.line == b.line && a.ch == b.ch; }
// Kill 'ring'
var killRing = [];
function addToRing(str) {
killRing.push(str);
if (killRing.length > 50) killRing.shift();
}
function growRingTop(str) {
if (!killRing.length) return addToRing(str);
killRing[killRing.length - 1] += str;
}
function getFromRing(n) { return killRing[killRing.length - (n ? Math.min(n, 1) : 1)] || ""; }
function popFromRing() { if (killRing.length > 1) killRing.pop(); return getFromRing(); }
var lastKill = null;
function kill(cm, from, to, mayGrow, text) {
if (text == null) text = cm.getRange(from, to);
if (mayGrow && lastKill && lastKill.cm == cm && posEq(from, lastKill.pos) && cm.isClean(lastKill.gen))
growRingTop(text);
else
addToRing(text);
cm.replaceRange("", from, to, "+delete");
if (mayGrow) lastKill = {cm: cm, pos: from, gen: cm.changeGeneration()};
else lastKill = null;
}
// Boundaries of various units
function byChar(cm, pos, dir) {
return cm.findPosH(pos, dir, "char", true);
}
function byWord(cm, pos, dir) {
return cm.findPosH(pos, dir, "word", true);
}
function byLine(cm, pos, dir) {
return cm.findPosV(pos, dir, "line", cm.doc.sel.goalColumn);
}
function byPage(cm, pos, dir) {
return cm.findPosV(pos, dir, "page", cm.doc.sel.goalColumn);
}
function byParagraph(cm, pos, dir) {
var no = pos.line, line = cm.getLine(no);
var sawText = /\S/.test(dir < 0 ? line.slice(0, pos.ch) : line.slice(pos.ch));
var fst = cm.firstLine(), lst = cm.lastLine();
for (;;) {
no += dir;
if (no < fst || no > lst)
return cm.clipPos(Pos(no - dir, dir < 0 ? 0 : null));
line = cm.getLine(no);
var hasText = /\S/.test(line);
if (hasText) sawText = true;
else if (sawText) return Pos(no, 0);
}
}
function bySentence(cm, pos, dir) {
var line = pos.line, ch = pos.ch;
var text = cm.getLine(pos.line), sawWord = false;
for (;;) {
var next = text.charAt(ch + (dir < 0 ? -1 : 0));
if (!next) { // End/beginning of line reached
if (line == (dir < 0 ? cm.firstLine() : cm.lastLine())) return Pos(line, ch);
text = cm.getLine(line + dir);
if (!/\S/.test(text)) return Pos(line, ch);
line += dir;
ch = dir < 0 ? text.length : 0;
continue;
}
if (sawWord && /[!?.]/.test(next)) return Pos(line, ch + (dir > 0 ? 1 : 0));
if (!sawWord) sawWord = /\w/.test(next);
ch += dir;
}
}
function byExpr(cm, pos, dir) {
var wrap;
if (cm.findMatchingBracket && (wrap = cm.findMatchingBracket(pos, true))
&& wrap.match && (wrap.forward ? 1 : -1) == dir)
return dir > 0 ? Pos(wrap.to.line, wrap.to.ch + 1) : wrap.to;
for (var first = true;; first = false) {
var token = cm.getTokenAt(pos);
var after = Pos(pos.line, dir < 0 ? token.start : token.end);
if (first && dir > 0 && token.end == pos.ch || !/\w/.test(token.string)) {
var newPos = cm.findPosH(after, dir, "char");
if (posEq(after, newPos)) return pos;
else pos = newPos;
} else {
return after;
}
}
}
// Prefixes (only crudely supported)
function getPrefix(cm, precise) {
var digits = cm.state.emacsPrefix;
if (!digits) return precise ? null : 1;
clearPrefix(cm);
return digits == "-" ? -1 : Number(digits);
}
function repeated(cmd) {
var f = typeof cmd == "string" ? function(cm) { cm.execCommand(cmd); } : cmd;
return function(cm) {
var prefix = getPrefix(cm);
f(cm);
for (var i = 1; i < prefix; ++i) f(cm);
};
}
function findEnd(cm, by, dir) {
var pos = cm.getCursor(), prefix = getPrefix(cm);
if (prefix < 0) { dir = -dir; prefix = -prefix; }
for (var i = 0; i < prefix; ++i) {
var newPos = by(cm, pos, dir);
if (posEq(newPos, pos)) break;
pos = newPos;
}
return pos;
}
function move(by, dir) {
var f = function(cm) {
cm.extendSelection(findEnd(cm, by, dir));
};
f.motion = true;
return f;
}
function killTo(cm, by, dir) {
kill(cm, cm.getCursor(), findEnd(cm, by, dir), true);
}
function addPrefix(cm, digit) {
if (cm.state.emacsPrefix) {
if (digit != "-") cm.state.emacsPrefix += digit;
return;
}
// Not active yet
cm.state.emacsPrefix = digit;
cm.on("keyHandled", maybeClearPrefix);
cm.on("inputRead", maybeDuplicateInput);
}
var prefixPreservingKeys = {"Alt-G": true, "Ctrl-X": true, "Ctrl-Q": true, "Ctrl-U": true};
function maybeClearPrefix(cm, arg) {
if (!cm.state.emacsPrefixMap && !prefixPreservingKeys.hasOwnProperty(arg))
clearPrefix(cm);
}
function clearPrefix(cm) {
cm.state.emacsPrefix = null;
cm.off("keyHandled", maybeClearPrefix);
cm.off("inputRead", maybeDuplicateInput);
}
function maybeDuplicateInput(cm, event) {
var dup = getPrefix(cm);
if (dup > 1 && event.origin == "+input") {
var one = event.text.join("\n"), txt = "";
for (var i = 1; i < dup; ++i) txt += one;
cm.replaceSelection(txt, "end", "+input");
}
}
function addPrefixMap(cm) {
cm.state.emacsPrefixMap = true;
cm.addKeyMap(prefixMap);
cm.on("keyHandled", maybeRemovePrefixMap);
cm.on("inputRead", maybeRemovePrefixMap);
}
function maybeRemovePrefixMap(cm, arg) {
if (typeof arg == "string" && (/^\d$/.test(arg) || arg == "Ctrl-U")) return;
cm.removeKeyMap(prefixMap);
cm.state.emacsPrefixMap = false;
cm.off("keyHandled", maybeRemovePrefixMap);
cm.off("inputRead", maybeRemovePrefixMap);
}
// Utilities
function setMark(cm) {
cm.setCursor(cm.getCursor());
cm.setExtending(true);
cm.on("change", function() { cm.setExtending(false); });
}
function getInput(cm, msg, f) {
if (cm.openDialog)
cm.openDialog(msg + ": <input type=\"text\" style=\"width: 10em\"/>", f, {bottom: true});
else
f(prompt(msg, ""));
}
function operateOnWord(cm, op) {
var start = cm.getCursor(), end = cm.findPosH(start, 1, "word");
cm.replaceRange(op(cm.getRange(start, end)), start, end);
cm.setCursor(end);
}
function toEnclosingExpr(cm) {
var pos = cm.getCursor(), line = pos.line, ch = pos.ch;
var stack = [];
while (line >= cm.firstLine()) {
var text = cm.getLine(line);
for (var i = ch == null ? text.length : ch; i > 0;) {
var ch = text.charAt(--i);
if (ch == ")")
stack.push("(");
else if (ch == "]")
stack.push("[");
else if (ch == "}")
stack.push("{");
else if (/[\(\{\[]/.test(ch) && (!stack.length || stack.pop() != ch))
return cm.extendSelection(Pos(line, i));
}
--line; ch = null;
}
}
// Actual keymap
var keyMap = CodeMirror.keyMap.emacs = {
"Ctrl-W": function(cm) {kill(cm, cm.getCursor("start"), cm.getCursor("end"));},
"Ctrl-K": repeated(function(cm) {
var start = cm.getCursor(), end = cm.clipPos(Pos(start.line));
var text = cm.getRange(start, end);
if (!/\S/.test(text)) {
text += "\n";
end = Pos(start.line + 1, 0);
}
kill(cm, start, end, true, text);
}),
"Alt-W": function(cm) {
addToRing(cm.getSelection());
},
"Ctrl-Y": function(cm) {
var start = cm.getCursor();
cm.replaceRange(getFromRing(getPrefix(cm)), start, start, "paste");
cm.setSelection(start, cm.getCursor());
},
"Alt-Y": function(cm) {cm.replaceSelection(popFromRing());},
"Ctrl-Space": setMark, "Ctrl-Shift-2": setMark,
"Ctrl-F": move(byChar, 1), "Ctrl-B": move(byChar, -1),
"Right": move(byChar, 1), "Left": move(byChar, -1),
"Ctrl-D": function(cm) { killTo(cm, byChar, 1); },
"Delete": function(cm) { killTo(cm, byChar, 1); },
"Ctrl-H": function(cm) { killTo(cm, byChar, -1); },
"Backspace": function(cm) { killTo(cm, byChar, -1); },
"Alt-F": move(byWord, 1), "Alt-B": move(byWord, -1),
"Alt-D": function(cm) { killTo(cm, byWord, 1); },
"Alt-Backspace": function(cm) { killTo(cm, byWord, -1); },
"Ctrl-N": move(byLine, 1), "Ctrl-P": move(byLine, -1),
"Down": move(byLine, 1), "Up": move(byLine, -1),
"Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",
"End": "goLineEnd", "Home": "goLineStart",
"Alt-V": move(byPage, -1), "Ctrl-V": move(byPage, 1),
"PageUp": move(byPage, -1), "PageDown": move(byPage, 1),
"Ctrl-Up": move(byParagraph, -1), "Ctrl-Down": move(byParagraph, 1),
"Alt-A": move(bySentence, -1), "Alt-E": move(bySentence, 1),
"Alt-K": function(cm) { killTo(cm, bySentence, 1); },
"Ctrl-Alt-K": function(cm) { killTo(cm, byExpr, 1); },
"Ctrl-Alt-Backspace": function(cm) { killTo(cm, byExpr, -1); },
"Ctrl-Alt-F": move(byExpr, 1), "Ctrl-Alt-B": move(byExpr, -1),
"Shift-Ctrl-Alt-2": function(cm) {
cm.setSelection(findEnd(cm, byExpr, 1), cm.getCursor());
},
"Ctrl-Alt-T": function(cm) {
var leftStart = byExpr(cm, cm.getCursor(), -1), leftEnd = byExpr(cm, leftStart, 1);
var rightEnd = byExpr(cm, leftEnd, 1), rightStart = byExpr(cm, rightEnd, -1);
cm.replaceRange(cm.getRange(rightStart, rightEnd) + cm.getRange(leftEnd, rightStart) +
cm.getRange(leftStart, leftEnd), leftStart, rightEnd);
},
"Ctrl-Alt-U": repeated(toEnclosingExpr),
"Alt-Space": function(cm) {
var pos = cm.getCursor(), from = pos.ch, to = pos.ch, text = cm.getLine(pos.line);
while (from && /\s/.test(text.charAt(from - 1))) --from;
while (to < text.length && /\s/.test(text.charAt(to))) ++to;
cm.replaceRange(" ", Pos(pos.line, from), Pos(pos.line, to));
},
"Ctrl-O": repeated(function(cm) { cm.replaceSelection("\n", "start"); }),
"Ctrl-T": repeated(function(cm) {
var pos = cm.getCursor();
if (pos.ch < cm.getLine(pos.line).length) pos = Pos(pos.line, pos.ch + 1);
var from = cm.findPosH(pos, -2, "char");
var range = cm.getRange(from, pos);
if (range.length != 2) return;
cm.setSelection(from, pos);
cm.replaceSelection(range.charAt(1) + range.charAt(0), "end");
}),
"Alt-C": repeated(function(cm) {
operateOnWord(cm, function(w) {
var letter = w.search(/\w/);
if (letter == -1) return w;
return w.slice(0, letter) + w.charAt(letter).toUpperCase() + w.slice(letter + 1).toLowerCase();
});
}),
"Alt-U": repeated(function(cm) {
operateOnWord(cm, function(w) { return w.toUpperCase(); });
}),
"Alt-L": repeated(function(cm) {
operateOnWord(cm, function(w) { return w.toLowerCase(); });
}),
"Alt-;": "toggleComment",
"Ctrl-/": repeated("undo"), "Shift-Ctrl--": repeated("undo"),
"Ctrl-Z": repeated("undo"), "Cmd-Z": repeated("undo"),
"Shift-Alt-,": "goDocStart", "Shift-Alt-.": "goDocEnd",
"Ctrl-S": "findNext", "Ctrl-R": "findPrev", "Ctrl-G": "clearSearch", "Shift-Alt-5": "replace",
"Alt-/": "autocomplete",
"Ctrl-J": "newlineAndIndent", "Enter": false, "Tab": "indentAuto",
"Alt-G": function(cm) {cm.setOption("keyMap", "emacs-Alt-G");},
"Ctrl-X": function(cm) {cm.setOption("keyMap", "emacs-Ctrl-X");},
"Ctrl-Q": function(cm) {cm.setOption("keyMap", "emacs-Ctrl-Q");},
"Ctrl-U": addPrefixMap
};
CodeMirror.keyMap["emacs-Ctrl-X"] = {
"Tab": function(cm) {
cm.indentSelection(getPrefix(cm, true) || cm.getOption("indentUnit"));
},
"Ctrl-X": function(cm) {
cm.setSelection(cm.getCursor("head"), cm.getCursor("anchor"));
},
"Ctrl-S": "save", "Ctrl-W": "save", "S": "saveAll", "F": "open", "U": repeated("undo"), "K": "close",
"Delete": function(cm) { kill(cm, cm.getCursor(), bySentence(cm, cm.getCursor(), 1), true); },
auto: "emacs", nofallthrough: true, disableInput: true
};
CodeMirror.keyMap["emacs-Alt-G"] = {
"G": function(cm) {
var prefix = getPrefix(cm, true);
if (prefix != null && prefix > 0) return cm.setCursor(prefix - 1);
getInput(cm, "Goto line", function(str) {
var num;
if (str && !isNaN(num = Number(str)) && num == num|0 && num > 0)
cm.setCursor(num - 1);
});
},
auto: "emacs", nofallthrough: true, disableInput: true
};
CodeMirror.keyMap["emacs-Ctrl-Q"] = {
"Tab": repeated("insertTab"),
auto: "emacs", nofallthrough: true
};
var prefixMap = {"Ctrl-G": clearPrefix};
function regPrefix(d) {
prefixMap[d] = function(cm) { addPrefix(cm, d); };
keyMap["Ctrl-" + d] = function(cm) { addPrefix(cm, d); };
prefixPreservingKeys["Ctrl-" + d] = true;
}
for (var i = 0; i < 10; ++i) regPrefix(String(i));
regPrefix("-");
})();