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var assert = require("assert");
var linesModule = require("./lines");
var types = require("./types");
var getFieldValue = types.getFieldValue;
var Printable = types.namedTypes.Printable;
var Expression = types.namedTypes.Expression;
var ReturnStatement = types.namedTypes.ReturnStatement;
var SourceLocation = types.namedTypes.SourceLocation;
var util = require("./util");
var comparePos = util.comparePos;
var FastPath = require("./fast-path");
var isObject = types.builtInTypes.object;
var isArray = types.builtInTypes.array;
var isString = types.builtInTypes.string;
var riskyAdjoiningCharExp = /[0-9a-z_$]/i;
function Patcher(lines) {
assert.ok(this instanceof Patcher);
assert.ok(lines instanceof linesModule.Lines);
var self = this,
replacements = [];
self.replace = function(loc, lines) {
if (isString.check(lines))
lines = linesModule.fromString(lines);
replacements.push({
lines: lines,
start: loc.start,
end: loc.end
});
};
self.get = function(loc) {
// If no location is provided, return the complete Lines object.
loc = loc || {
start: { line: 1, column: 0 },
end: { line: lines.length,
column: lines.getLineLength(lines.length) }
};
var sliceFrom = loc.start,
toConcat = [];
function pushSlice(from, to) {
assert.ok(comparePos(from, to) <= 0);
toConcat.push(lines.slice(from, to));
}
replacements.sort(function(a, b) {
return comparePos(a.start, b.start);
}).forEach(function(rep) {
if (comparePos(sliceFrom, rep.start) > 0) {
// Ignore nested replacement ranges.
} else {
pushSlice(sliceFrom, rep.start);
toConcat.push(rep.lines);
sliceFrom = rep.end;
}
});
pushSlice(sliceFrom, loc.end);
return linesModule.concat(toConcat);
};
}
exports.Patcher = Patcher;
var Pp = Patcher.prototype;
Pp.tryToReprintComments = function(newNode, oldNode, print) {
var patcher = this;
if (!newNode.comments &&
!oldNode.comments) {
// We were (vacuously) able to reprint all the comments!
return true;
}
var newPath = FastPath.from(newNode);
var oldPath = FastPath.from(oldNode);
newPath.stack.push("comments", getSurroundingComments(newNode));
oldPath.stack.push("comments", getSurroundingComments(oldNode));
var reprints = [];
var ableToReprintComments =
findArrayReprints(newPath, oldPath, reprints);
// No need to pop anything from newPath.stack or oldPath.stack, since
// newPath and oldPath are fresh local variables.
if (ableToReprintComments && reprints.length > 0) {
reprints.forEach(function(reprint) {
var oldComment = reprint.oldPath.getValue();
assert.ok(oldComment.leading || oldComment.trailing);
patcher.replace(
oldComment.loc,
// Comments can't have .comments, so it doesn't matter
// whether we print with comments or without.
print(reprint.newPath).indentTail(oldComment.loc.indent)
);
});
}
return ableToReprintComments;
};
// Get all comments that are either leading or trailing, ignoring any
// comments that occur inside node.loc. Returns an empty array for nodes
// with no leading or trailing comments.
function getSurroundingComments(node) {
var result = [];
if (node.comments &&
node.comments.length > 0) {
node.comments.forEach(function(comment) {
if (comment.leading || comment.trailing) {
result.push(comment);
}
});
}
return result;
}
Pp.deleteComments = function(node) {
if (!node.comments) {
return;
}
var patcher = this;
node.comments.forEach(function(comment) {
if (comment.leading) {
// Delete leading comments along with any trailing whitespace
// they might have.
patcher.replace({
start: comment.loc.start,
end: node.loc.lines.skipSpaces(
comment.loc.end, false, false)
}, "");
} else if (comment.trailing) {
// Delete trailing comments along with any leading whitespace
// they might have.
patcher.replace({
start: node.loc.lines.skipSpaces(
comment.loc.start, true, false),
end: comment.loc.end
}, "");
}
});
};
exports.getReprinter = function(path) {
assert.ok(path instanceof FastPath);
// Make sure that this path refers specifically to a Node, rather than
// some non-Node subproperty of a Node.
var node = path.getValue();
if (!Printable.check(node))
return;
var orig = node.original;
var origLoc = orig && orig.loc;
var lines = origLoc && origLoc.lines;
var reprints = [];
if (!lines || !findReprints(path, reprints))
return;
return function(print) {
var patcher = new Patcher(lines);
reprints.forEach(function(reprint) {
var newNode = reprint.newPath.getValue();
var oldNode = reprint.oldPath.getValue();
SourceLocation.assert(oldNode.loc, true);
var needToPrintNewPathWithComments =
!patcher.tryToReprintComments(newNode, oldNode, print)
if (needToPrintNewPathWithComments) {
// Since we were not able to preserve all leading/trailing
// comments, we delete oldNode's comments, print newPath
// with comments, and then patch the resulting lines where
// oldNode used to be.
patcher.deleteComments(oldNode);
}
var newLines = print(
reprint.newPath,
needToPrintNewPathWithComments
).indentTail(oldNode.loc.indent);
var nls = needsLeadingSpace(lines, oldNode.loc, newLines);
var nts = needsTrailingSpace(lines, oldNode.loc, newLines);
// If we try to replace the argument of a ReturnStatement like
// return"asdf" with e.g. a literal null expression, we run
// the risk of ending up with returnnull, so we need to add an
// extra leading space in situations where that might
// happen. Likewise for "asdf"in obj. See #170.
if (nls || nts) {
var newParts = [];
nls && newParts.push(" ");
newParts.push(newLines);
nts && newParts.push(" ");
newLines = linesModule.concat(newParts);
}
patcher.replace(oldNode.loc, newLines);
});
// Recall that origLoc is the .loc of an ancestor node that is
// guaranteed to contain all the reprinted nodes and comments.
return patcher.get(origLoc).indentTail(-orig.loc.indent);
};
};
// If the last character before oldLoc and the first character of newLines
// are both identifier characters, they must be separated by a space,
// otherwise they will most likely get fused together into a single token.
function needsLeadingSpace(oldLines, oldLoc, newLines) {
var posBeforeOldLoc = util.copyPos(oldLoc.start);
// The character just before the location occupied by oldNode.
var charBeforeOldLoc =
oldLines.prevPos(posBeforeOldLoc) &&
oldLines.charAt(posBeforeOldLoc);
// First character of the reprinted node.
var newFirstChar = newLines.charAt(newLines.firstPos());
return charBeforeOldLoc &&
riskyAdjoiningCharExp.test(charBeforeOldLoc) &&
newFirstChar &&
riskyAdjoiningCharExp.test(newFirstChar);
}
// If the last character of newLines and the first character after oldLoc
// are both identifier characters, they must be separated by a space,
// otherwise they will most likely get fused together into a single token.
function needsTrailingSpace(oldLines, oldLoc, newLines) {
// The character just after the location occupied by oldNode.
var charAfterOldLoc = oldLines.charAt(oldLoc.end);
var newLastPos = newLines.lastPos();
// Last character of the reprinted node.
var newLastChar = newLines.prevPos(newLastPos) &&
newLines.charAt(newLastPos);
return newLastChar &&
riskyAdjoiningCharExp.test(newLastChar) &&
charAfterOldLoc &&
riskyAdjoiningCharExp.test(charAfterOldLoc);
}
function findReprints(newPath, reprints) {
var newNode = newPath.getValue();
Printable.assert(newNode);
var oldNode = newNode.original;
Printable.assert(oldNode);
assert.deepEqual(reprints, []);
if (newNode.type !== oldNode.type) {
return false;
}
var oldPath = new FastPath(oldNode);
var canReprint = findChildReprints(newPath, oldPath, reprints);
if (!canReprint) {
// Make absolutely sure the calling code does not attempt to reprint
// any nodes.
reprints.length = 0;
}
return canReprint;
}
function findAnyReprints(newPath, oldPath, reprints) {
var newNode = newPath.getValue();
var oldNode = oldPath.getValue();
if (newNode === oldNode)
return true;
if (isArray.check(newNode))
return findArrayReprints(newPath, oldPath, reprints);
if (isObject.check(newNode))
return findObjectReprints(newPath, oldPath, reprints);
return false;
}
function findArrayReprints(newPath, oldPath, reprints) {
var newNode = newPath.getValue();
var oldNode = oldPath.getValue();
isArray.assert(newNode);
var len = newNode.length;
if (!(isArray.check(oldNode) &&
oldNode.length === len))
return false;
for (var i = 0; i < len; ++i) {
newPath.stack.push(i, newNode[i]);
oldPath.stack.push(i, oldNode[i]);
var canReprint = findAnyReprints(newPath, oldPath, reprints);
newPath.stack.length -= 2;
oldPath.stack.length -= 2;
if (!canReprint) {
return false;
}
}
return true;
}
function findObjectReprints(newPath, oldPath, reprints) {
var newNode = newPath.getValue();
isObject.assert(newNode);
if (newNode.original === null) {
// If newNode.original node was set to null, reprint the node.
return false;
}
var oldNode = oldPath.getValue();
if (!isObject.check(oldNode))
return false;
if (Printable.check(newNode)) {
if (!Printable.check(oldNode)) {
return false;
}
// Here we need to decide whether the reprinted code for newNode
// is appropriate for patching into the location of oldNode.
if (newNode.type === oldNode.type) {
var childReprints = [];
if (findChildReprints(newPath, oldPath, childReprints)) {
reprints.push.apply(reprints, childReprints);
} else if (oldNode.loc) {
// If we have no .loc information for oldNode, then we
// won't be able to reprint it.
reprints.push({
oldPath: oldPath.copy(),
newPath: newPath.copy()
});
} else {
return false;
}
return true;
}
if (Expression.check(newNode) &&
Expression.check(oldNode) &&
// If we have no .loc information for oldNode, then we won't
// be able to reprint it.
oldNode.loc) {
// If both nodes are subtypes of Expression, then we should be
// able to fill the location occupied by the old node with
// code printed for the new node with no ill consequences.
reprints.push({
oldPath: oldPath.copy(),
newPath: newPath.copy()
});
return true;
}
// The nodes have different types, and at least one of the types
// is not a subtype of the Expression type, so we cannot safely
// assume the nodes are syntactically interchangeable.
return false;
}
return findChildReprints(newPath, oldPath, reprints);
}
// This object is reused in hasOpeningParen and hasClosingParen to avoid
// having to allocate a temporary object.
var reusablePos = { line: 1, column: 0 };
var nonSpaceExp = /\S/;
function hasOpeningParen(oldPath) {
var oldNode = oldPath.getValue();
var loc = oldNode.loc;
var lines = loc && loc.lines;
if (lines) {
var pos = reusablePos;
pos.line = loc.start.line;
pos.column = loc.start.column;
while (lines.prevPos(pos)) {
var ch = lines.charAt(pos);
if (ch === "(") {
// If we found an opening parenthesis but it occurred before
// the start of the original subtree for this reprinting, then
// we must not return true for hasOpeningParen(oldPath).
return comparePos(oldPath.getRootValue().loc.start, pos) <= 0;
}
if (nonSpaceExp.test(ch)) {
return false;
}
}
}
return false;
}
function hasClosingParen(oldPath) {
var oldNode = oldPath.getValue();
var loc = oldNode.loc;
var lines = loc && loc.lines;
if (lines) {
var pos = reusablePos;
pos.line = loc.end.line;
pos.column = loc.end.column;
do {
var ch = lines.charAt(pos);
if (ch === ")") {
// If we found a closing parenthesis but it occurred after the
// end of the original subtree for this reprinting, then we
// must not return true for hasClosingParen(oldPath).
return comparePos(pos, oldPath.getRootValue().loc.end) <= 0;
}
if (nonSpaceExp.test(ch)) {
return false;
}
} while (lines.nextPos(pos));
}
return false;
}
function hasParens(oldPath) {
// This logic can technically be fooled if the node has parentheses
// but there are comments intervening between the parentheses and the
// node. In such cases the node will be harmlessly wrapped in an
// additional layer of parentheses.
return hasOpeningParen(oldPath) && hasClosingParen(oldPath);
}
function findChildReprints(newPath, oldPath, reprints) {
var newNode = newPath.getValue();
var oldNode = oldPath.getValue();
isObject.assert(newNode);
isObject.assert(oldNode);
if (newNode.original === null) {
// If newNode.original node was set to null, reprint the node.
return false;
}
// If this type of node cannot come lexically first in its enclosing
// statement (e.g. a function expression or object literal), and it
// seems to be doing so, then the only way we can ignore this problem
// and save ourselves from falling back to the pretty printer is if an
// opening parenthesis happens to precede the node. For example,
// (function(){ ... }()); does not need to be reprinted, even though
// the FunctionExpression comes lexically first in the enclosing
// ExpressionStatement and fails the hasParens test, because the
// parent CallExpression passes the hasParens test. If we relied on
// the path.needsParens() && !hasParens(oldNode) check below, the
// absence of a closing parenthesis after the FunctionExpression would
// trigger pretty-printing unnecessarily.
if (!newPath.canBeFirstInStatement() &&
newPath.firstInStatement() &&
!hasOpeningParen(oldPath))
return false;
// If this node needs parentheses and will not be wrapped with
// parentheses when reprinted, then return false to skip reprinting
// and let it be printed generically.
if (newPath.needsParens(true) && !hasParens(oldPath)) {
return false;
}
var keys = util.getUnionOfKeys(oldNode, newNode);
if (oldNode.type === "File" ||
newNode.type === "File") {
// Don't bother traversing file.tokens, an often very large array
// returned by Babylon, and useless for our purposes.
delete keys.tokens;
}
// Don't bother traversing .loc objects looking for reprintable nodes.
delete keys.loc;
var originalReprintCount = reprints.length;
for (var k in keys) {
newPath.stack.push(k, types.getFieldValue(newNode, k));
oldPath.stack.push(k, types.getFieldValue(oldNode, k));
var canReprint = findAnyReprints(newPath, oldPath, reprints);
newPath.stack.length -= 2;
oldPath.stack.length -= 2;
if (!canReprint) {
return false;
}
}
// Return statements might end up running into ASI issues due to comments
// inserted deep within the tree, so reprint them if anything changed
// within them.
if (ReturnStatement.check(newPath.getNode()) &&
reprints.length > originalReprintCount) {
return false;
}
return true;
}