mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
7b4cbd85cf
acorn is now at db59bd0296c16796a07e82d2dc284861f464603e (untagged commit after 0.11.0 release). pretty-fast is now at abc8c1133cc5443fb3bb50c426731821d27300a6 (tagged 0.2.0).
352 lines
12 KiB
JavaScript
352 lines
12 KiB
JavaScript
// AST walker module for Mozilla Parser API compatible trees
|
|
|
|
(function(mod) {
|
|
if (typeof exports == "object" && typeof module == "object") return mod(exports); // CommonJS
|
|
if (typeof define == "function" && define.amd) return define(["exports"], mod); // AMD
|
|
mod((this.acorn || (this.acorn = {})).walk = {}); // Plain browser env
|
|
})(function(exports) {
|
|
"use strict";
|
|
|
|
// A simple walk is one where you simply specify callbacks to be
|
|
// called on specific nodes. The last two arguments are optional. A
|
|
// simple use would be
|
|
//
|
|
// walk.simple(myTree, {
|
|
// Expression: function(node) { ... }
|
|
// });
|
|
//
|
|
// to do something with all expressions. All Parser API node types
|
|
// can be used to identify node types, as well as Expression,
|
|
// Statement, and ScopeBody, which denote categories of nodes.
|
|
//
|
|
// The base argument can be used to pass a custom (recursive)
|
|
// walker, and state can be used to give this walked an initial
|
|
// state.
|
|
exports.simple = function(node, visitors, base, state) {
|
|
if (!base) base = exports.base;
|
|
function c(node, st, override) {
|
|
var type = override || node.type, found = visitors[type];
|
|
base[type](node, st, c);
|
|
if (found) found(node, st);
|
|
}
|
|
c(node, state);
|
|
};
|
|
|
|
// An ancestor walk builds up an array of ancestor nodes (including
|
|
// the current node) and passes them to the callback as the state parameter.
|
|
exports.ancestor = function(node, visitors, base, state) {
|
|
if (!base) base = exports.base;
|
|
if (!state) state = [];
|
|
function c(node, st, override) {
|
|
var type = override || node.type, found = visitors[type];
|
|
if (node != st[st.length - 1]) {
|
|
st = st.slice();
|
|
st.push(node);
|
|
}
|
|
base[type](node, st, c);
|
|
if (found) found(node, st);
|
|
}
|
|
c(node, state);
|
|
};
|
|
|
|
// A recursive walk is one where your functions override the default
|
|
// walkers. They can modify and replace the state parameter that's
|
|
// threaded through the walk, and can opt how and whether to walk
|
|
// their child nodes (by calling their third argument on these
|
|
// nodes).
|
|
exports.recursive = function(node, state, funcs, base) {
|
|
var visitor = funcs ? exports.make(funcs, base) : base;
|
|
function c(node, st, override) {
|
|
visitor[override || node.type](node, st, c);
|
|
}
|
|
c(node, state);
|
|
};
|
|
|
|
function makeTest(test) {
|
|
if (typeof test == "string")
|
|
return function(type) { return type == test; };
|
|
else if (!test)
|
|
return function() { return true; };
|
|
else
|
|
return test;
|
|
}
|
|
|
|
function Found(node, state) { this.node = node; this.state = state; }
|
|
|
|
// Find a node with a given start, end, and type (all are optional,
|
|
// null can be used as wildcard). Returns a {node, state} object, or
|
|
// undefined when it doesn't find a matching node.
|
|
exports.findNodeAt = function(node, start, end, test, base, state) {
|
|
test = makeTest(test);
|
|
try {
|
|
if (!base) base = exports.base;
|
|
var c = function(node, st, override) {
|
|
var type = override || node.type;
|
|
if ((start == null || node.start <= start) &&
|
|
(end == null || node.end >= end))
|
|
base[type](node, st, c);
|
|
if (test(type, node) &&
|
|
(start == null || node.start == start) &&
|
|
(end == null || node.end == end))
|
|
throw new Found(node, st);
|
|
};
|
|
c(node, state);
|
|
} catch (e) {
|
|
if (e instanceof Found) return e;
|
|
throw e;
|
|
}
|
|
};
|
|
|
|
// Find the innermost node of a given type that contains the given
|
|
// position. Interface similar to findNodeAt.
|
|
exports.findNodeAround = function(node, pos, test, base, state) {
|
|
test = makeTest(test);
|
|
try {
|
|
if (!base) base = exports.base;
|
|
var c = function(node, st, override) {
|
|
var type = override || node.type;
|
|
if (node.start > pos || node.end < pos) return;
|
|
base[type](node, st, c);
|
|
if (test(type, node)) throw new Found(node, st);
|
|
};
|
|
c(node, state);
|
|
} catch (e) {
|
|
if (e instanceof Found) return e;
|
|
throw e;
|
|
}
|
|
};
|
|
|
|
// Find the outermost matching node after a given position.
|
|
exports.findNodeAfter = function(node, pos, test, base, state) {
|
|
test = makeTest(test);
|
|
try {
|
|
if (!base) base = exports.base;
|
|
var c = function(node, st, override) {
|
|
if (node.end < pos) return;
|
|
var type = override || node.type;
|
|
if (node.start >= pos && test(type, node)) throw new Found(node, st);
|
|
base[type](node, st, c);
|
|
};
|
|
c(node, state);
|
|
} catch (e) {
|
|
if (e instanceof Found) return e;
|
|
throw e;
|
|
}
|
|
};
|
|
|
|
// Find the outermost matching node before a given position.
|
|
exports.findNodeBefore = function(node, pos, test, base, state) {
|
|
test = makeTest(test);
|
|
if (!base) base = exports.base;
|
|
var max;
|
|
var c = function(node, st, override) {
|
|
if (node.start > pos) return;
|
|
var type = override || node.type;
|
|
if (node.end <= pos && (!max || max.node.end < node.end) && test(type, node))
|
|
max = new Found(node, st);
|
|
base[type](node, st, c);
|
|
};
|
|
c(node, state);
|
|
return max;
|
|
};
|
|
|
|
// Used to create a custom walker. Will fill in all missing node
|
|
// type properties with the defaults.
|
|
exports.make = function(funcs, base) {
|
|
if (!base) base = exports.base;
|
|
var visitor = {};
|
|
for (var type in base) visitor[type] = base[type];
|
|
for (var type in funcs) visitor[type] = funcs[type];
|
|
return visitor;
|
|
};
|
|
|
|
function skipThrough(node, st, c) { c(node, st); }
|
|
function ignore(_node, _st, _c) {}
|
|
|
|
// Node walkers.
|
|
|
|
var base = exports.base = {};
|
|
base.Program = base.BlockStatement = function(node, st, c) {
|
|
for (var i = 0; i < node.body.length; ++i)
|
|
c(node.body[i], st, "Statement");
|
|
};
|
|
base.Statement = skipThrough;
|
|
base.EmptyStatement = ignore;
|
|
base.ExpressionStatement = function(node, st, c) {
|
|
c(node.expression, st, "Expression");
|
|
};
|
|
base.IfStatement = function(node, st, c) {
|
|
c(node.test, st, "Expression");
|
|
c(node.consequent, st, "Statement");
|
|
if (node.alternate) c(node.alternate, st, "Statement");
|
|
};
|
|
base.LabeledStatement = function(node, st, c) {
|
|
c(node.body, st, "Statement");
|
|
};
|
|
base.BreakStatement = base.ContinueStatement = ignore;
|
|
base.WithStatement = function(node, st, c) {
|
|
c(node.object, st, "Expression");
|
|
c(node.body, st, "Statement");
|
|
};
|
|
base.SwitchStatement = function(node, st, c) {
|
|
c(node.discriminant, st, "Expression");
|
|
for (var i = 0; i < node.cases.length; ++i) {
|
|
var cs = node.cases[i];
|
|
if (cs.test) c(cs.test, st, "Expression");
|
|
for (var j = 0; j < cs.consequent.length; ++j)
|
|
c(cs.consequent[j], st, "Statement");
|
|
}
|
|
};
|
|
base.ReturnStatement = base.YieldExpression = function(node, st, c) {
|
|
if (node.argument) c(node.argument, st, "Expression");
|
|
};
|
|
base.ThrowStatement = base.SpreadElement = function(node, st, c) {
|
|
c(node.argument, st, "Expression");
|
|
};
|
|
base.TryStatement = function(node, st, c) {
|
|
c(node.block, st, "Statement");
|
|
if (node.handler) c(node.handler.body, st, "ScopeBody");
|
|
if (node.finalizer) c(node.finalizer, st, "Statement");
|
|
};
|
|
base.WhileStatement = function(node, st, c) {
|
|
c(node.test, st, "Expression");
|
|
c(node.body, st, "Statement");
|
|
};
|
|
base.DoWhileStatement = base.WhileStatement;
|
|
base.ForStatement = function(node, st, c) {
|
|
if (node.init) c(node.init, st, "ForInit");
|
|
if (node.test) c(node.test, st, "Expression");
|
|
if (node.update) c(node.update, st, "Expression");
|
|
c(node.body, st, "Statement");
|
|
};
|
|
base.ForInStatement = base.ForOfStatement = function(node, st, c) {
|
|
c(node.left, st, "ForInit");
|
|
c(node.right, st, "Expression");
|
|
c(node.body, st, "Statement");
|
|
};
|
|
base.ForInit = function(node, st, c) {
|
|
if (node.type == "VariableDeclaration") c(node, st);
|
|
else c(node, st, "Expression");
|
|
};
|
|
base.DebuggerStatement = ignore;
|
|
|
|
base.FunctionDeclaration = function(node, st, c) {
|
|
c(node, st, "Function");
|
|
};
|
|
base.VariableDeclaration = function(node, st, c) {
|
|
for (var i = 0; i < node.declarations.length; ++i) {
|
|
var decl = node.declarations[i];
|
|
if (decl.init) c(decl.init, st, "Expression");
|
|
}
|
|
};
|
|
|
|
base.Function = function(node, st, c) {
|
|
c(node.body, st, "ScopeBody");
|
|
};
|
|
base.ScopeBody = function(node, st, c) {
|
|
c(node, st, "Statement");
|
|
};
|
|
|
|
base.Expression = skipThrough;
|
|
base.ThisExpression = ignore;
|
|
base.ArrayExpression = function(node, st, c) {
|
|
for (var i = 0; i < node.elements.length; ++i) {
|
|
var elt = node.elements[i];
|
|
if (elt) c(elt, st, "Expression");
|
|
}
|
|
};
|
|
base.ObjectExpression = function(node, st, c) {
|
|
for (var i = 0; i < node.properties.length; ++i)
|
|
c(node.properties[i], st);
|
|
};
|
|
base.FunctionExpression = base.ArrowFunctionExpression = base.FunctionDeclaration;
|
|
base.SequenceExpression = base.TemplateLiteral = function(node, st, c) {
|
|
for (var i = 0; i < node.expressions.length; ++i)
|
|
c(node.expressions[i], st, "Expression");
|
|
};
|
|
base.UnaryExpression = base.UpdateExpression = function(node, st, c) {
|
|
c(node.argument, st, "Expression");
|
|
};
|
|
base.BinaryExpression = base.AssignmentExpression = base.LogicalExpression = function(node, st, c) {
|
|
c(node.left, st, "Expression");
|
|
c(node.right, st, "Expression");
|
|
};
|
|
base.ConditionalExpression = function(node, st, c) {
|
|
c(node.test, st, "Expression");
|
|
c(node.consequent, st, "Expression");
|
|
c(node.alternate, st, "Expression");
|
|
};
|
|
base.NewExpression = base.CallExpression = function(node, st, c) {
|
|
c(node.callee, st, "Expression");
|
|
if (node.arguments) for (var i = 0; i < node.arguments.length; ++i)
|
|
c(node.arguments[i], st, "Expression");
|
|
};
|
|
base.MemberExpression = function(node, st, c) {
|
|
c(node.object, st, "Expression");
|
|
if (node.computed) c(node.property, st, "Expression");
|
|
};
|
|
base.Identifier = base.Literal = base.ExportDeclaration = base.ImportDeclaration = ignore;
|
|
|
|
base.TaggedTemplateExpression = function(node, st, c) {
|
|
c(node.tag, st, "Expression");
|
|
c(node.quasi, st);
|
|
};
|
|
base.ClassDeclaration = base.ClassExpression = function(node, st, c) {
|
|
if (node.superClass) c(node.superClass, st, "Expression");
|
|
for (var i = 0; i < node.body.body.length; i++)
|
|
c(node.body.body[i], st);
|
|
};
|
|
base.MethodDefinition = base.Property = function(node, st, c) {
|
|
if (node.computed) c(node.key, st, "Expression");
|
|
c(node.value, st, "Expression");
|
|
};
|
|
base.ComprehensionExpression = function(node, st, c) {
|
|
for (var i = 0; i < node.blocks.length; i++)
|
|
c(node.blocks[i].right, st, "Expression");
|
|
c(node.body, st, "Expression");
|
|
};
|
|
|
|
// NOTE: the stuff below is deprecated, and will be removed when 1.0 is released
|
|
|
|
// A custom walker that keeps track of the scope chain and the
|
|
// variables defined in it.
|
|
function makeScope(prev, isCatch) {
|
|
return {vars: Object.create(null), prev: prev, isCatch: isCatch};
|
|
}
|
|
function normalScope(scope) {
|
|
while (scope.isCatch) scope = scope.prev;
|
|
return scope;
|
|
}
|
|
exports.scopeVisitor = exports.make({
|
|
Function: function(node, scope, c) {
|
|
var inner = makeScope(scope);
|
|
for (var i = 0; i < node.params.length; ++i)
|
|
inner.vars[node.params[i].name] = {type: "argument", node: node.params[i]};
|
|
if (node.id) {
|
|
var decl = node.type == "FunctionDeclaration";
|
|
(decl ? normalScope(scope) : inner).vars[node.id.name] =
|
|
{type: decl ? "function" : "function name", node: node.id};
|
|
}
|
|
c(node.body, inner, "ScopeBody");
|
|
},
|
|
TryStatement: function(node, scope, c) {
|
|
c(node.block, scope, "Statement");
|
|
if (node.handler) {
|
|
var inner = makeScope(scope, true);
|
|
inner.vars[node.handler.param.name] = {type: "catch clause", node: node.handler.param};
|
|
c(node.handler.body, inner, "ScopeBody");
|
|
}
|
|
if (node.finalizer) c(node.finalizer, scope, "Statement");
|
|
},
|
|
VariableDeclaration: function(node, scope, c) {
|
|
var target = normalScope(scope);
|
|
for (var i = 0; i < node.declarations.length; ++i) {
|
|
var decl = node.declarations[i];
|
|
target.vars[decl.id.name] = {type: "var", node: decl.id};
|
|
if (decl.init) c(decl.init, scope, "Expression");
|
|
}
|
|
}
|
|
});
|
|
|
|
});
|