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Implemented go to definition

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This commit is contained in:
Alexandros Naskos 2020-05-18 23:19:23 +03:00
parent acd85c0f39
commit b1ce06a80d
3 changed files with 139 additions and 50 deletions
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61
src/analysis.zig
View File

@ -180,26 +180,42 @@ pub fn isPascalCase(name: []const u8) bool {
// ANALYSIS ENGINE
/// Gets the child of node
pub fn getChild(tree: *ast.Tree, node: *ast.Node, name: []const u8) ?*ast.Node {
var index: usize = 0;
while (node.iterate(index)) |child| {
switch (child.id) {
pub fn getDeclNameToken(tree: *ast.Tree, node: *ast.Node) ?ast.TokenIndex {
switch (node.id) {
.VarDecl => {
const vari = child.cast(ast.Node.VarDecl).?;
if (std.mem.eql(u8, tree.tokenSlice(vari.name_token), name)) return child;
const vari = node.cast(ast.Node.VarDecl).?;
return vari.name_token;
},
.ParamDecl => {
const decl = node.cast(ast.Node.ParamDecl).?;
if (decl.name_token == null) return null;
return decl.name_token.?;
},
.FnProto => {
const func = child.cast(ast.Node.FnProto).?;
if (func.name_token != null and std.mem.eql(u8, tree.tokenSlice(func.name_token.?), name)) return child;
const func = node.cast(ast.Node.FnProto).?;
if (func.name_token == null) return null;
return func.name_token.?;
},
.ContainerField => {
const field = child.cast(ast.Node.ContainerField).?;
if (std.mem.eql(u8, tree.tokenSlice(field.name_token), name)) return child;
const field = node.cast(ast.Node.ContainerField).?;
return field.name_token;
},
else => {},
}
index += 1;
return null;
}
fn getDeclName(tree: *ast.Tree, node: *ast.Node) ?[]const u8 {
return tree.tokenSlice(getDeclNameToken(tree, node) orelse return null);
}
/// Gets the child of node
pub fn getChild(tree: *ast.Tree, node: *ast.Node, name: []const u8) ?*ast.Node {
var index: usize = 0;
while (node.iterate(index)) |child| : (index += 1) {
const child_name = getDeclName(tree, child) orelse continue;
if (std.mem.eql(u8, child_name, name)) return child;
}
return null;
}
@ -207,25 +223,8 @@ pub fn getChild(tree: *ast.Tree, node: *ast.Node, name: []const u8) ?*ast.Node {
/// Gets the child of slice
pub fn getChildOfSlice(tree: *ast.Tree, nodes: []*ast.Node, name: []const u8) ?*ast.Node {
for (nodes) |child| {
switch (child.id) {
.VarDecl => {
const vari = child.cast(ast.Node.VarDecl).?;
if (std.mem.eql(u8, tree.tokenSlice(vari.name_token), name)) return child;
},
.ParamDecl => {
const decl = child.cast(ast.Node.ParamDecl).?;
if (decl.name_token != null and std.mem.eql(u8, tree.tokenSlice(decl.name_token.?), name)) return child;
},
.FnProto => {
const func = child.cast(ast.Node.FnProto).?;
if (func.name_token != null and std.mem.eql(u8, tree.tokenSlice(func.name_token.?), name)) return child;
},
.ContainerField => {
const field = child.cast(ast.Node.ContainerField).?;
if (std.mem.eql(u8, tree.tokenSlice(field.name_token), name)) return child;
},
else => {},
}
const child_name = getDeclName(tree, child) orelse continue;
if (std.mem.eql(u8, child_name, name)) return child;
}
return null;
}

112
src/main.zig
View File

@ -17,7 +17,7 @@ var allocator: *std.mem.Allocator = undefined;
var document_store: DocumentStore = undefined;
const initialize_response =
\\,"result":{"capabilities":{"signatureHelpProvider":{"triggerCharacters":["(",","]},"textDocumentSync":1,"completionProvider":{"resolveProvider":false,"triggerCharacters":[".",":","@"]},"documentHighlightProvider":false,"codeActionProvider":false,"workspace":{"workspaceFolders":{"supported":true}}}}}
\\,"result":{"capabilities":{"signatureHelpProvider":{"triggerCharacters":["(",","]},"textDocumentSync":1,"completionProvider":{"resolveProvider":false,"triggerCharacters":[".",":","@"]},"documentHighlightProvider":false,"codeActionProvider":false,"declarationProvider":true,"definitionProvider":true,"typeDefinitionProvider":true,"workspace":{"workspaceFolders":{"supported":true}}}}}
;
const not_implemented_response =
@ -258,6 +258,78 @@ fn nodeToCompletion(list: *std.ArrayList(types.CompletionItem), tree: *std.zig.a
}
}
fn identifierFromPosition(pos_index: usize, handle: DocumentStore.Handle) []const u8 {
var start_idx = pos_index;
while (start_idx > 0 and
(std.ascii.isAlNum(handle.document.text[start_idx]) or handle.document.text[start_idx] == '_')) : (start_idx -= 1)
{}
var end_idx = pos_index;
while (end_idx < handle.document.text.len and
(std.ascii.isAlNum(handle.document.text[end_idx]) or handle.document.text[end_idx] == '_')) : (end_idx += 1)
{}
return handle.document.text[start_idx + 1 .. end_idx];
}
fn gotoDefinitionGlobal(id: i64, pos_index: usize, handle: DocumentStore.Handle) !void {
var tree = try handle.tree(allocator);
defer tree.deinit();
const name = identifierFromPosition(pos_index, handle);
var arena = std.heap.ArenaAllocator.init(allocator);
defer arena.deinit();
var decl_nodes = std.ArrayList(*std.zig.ast.Node).init(&arena.allocator);
try analysis.declsFromIndex(&decl_nodes, tree, pos_index);
const decl = analysis.getChildOfSlice(tree, decl_nodes.items, name) orelse return try respondGeneric(id, null_result_response);
const name_token = analysis.getDeclNameToken(tree, decl) orelse unreachable;
try send(types.Response{
.id = .{ .Integer = id },
.result = .{
.Location = .{
.uri = handle.document.uri,
.range = astLocationToRange(tree.tokenLocation(0, name_token)),
},
},
});
}
fn gotoDefinitionFieldAccess(id: i64, handle: *DocumentStore.Handle, position: types.Position, line_start_idx: usize) !void {
var arena = std.heap.ArenaAllocator.init(allocator);
defer arena.deinit();
var analysis_ctx = try document_store.analysisContext(handle, &arena, position);
defer analysis_ctx.deinit();
const pos_index = try handle.document.positionToIndex(position);
var name = identifierFromPosition(pos_index, handle.*);
const line = try handle.document.getLine(@intCast(usize, position.line));
var tokenizer = std.zig.Tokenizer.init(line[line_start_idx..]);
const line_length = @ptrToInt(name.ptr) - @ptrToInt(line.ptr) + name.len - line_start_idx;
name = try std.mem.dupe(&arena.allocator, u8, name);
if (analysis.getFieldAccessTypeNode(&analysis_ctx, &tokenizer, line_length)) |container| {
const decl = analysis.getChild(analysis_ctx.tree, container, name) orelse return try respondGeneric(id, null_result_response);
const name_token = analysis.getDeclNameToken(analysis_ctx.tree, decl) orelse unreachable;
return try send(types.Response{
.id = .{ .Integer = id },
.result = .{
.Location = .{
.uri = analysis_ctx.handle.document.uri,
.range = astLocationToRange(analysis_ctx.tree.tokenLocation(0, name_token)),
},
},
});
}
try respondGeneric(id, null_result_response);
}
fn completeGlobal(id: i64, pos_index: usize, handle: DocumentStore.Handle, config: Config) !void {
var tree = try handle.tree(allocator);
defer tree.deinit();
@ -531,7 +603,7 @@ fn processJsonRpc(parser: *std.json.Parser, json: []const u8, config: Config) !v
const handle = document_store.getHandle(uri) orelse {
std.debug.warn("Trying to complete in non existent document {}", .{uri});
return;
return try respondGeneric(id, no_completions_response);
};
const pos = types.Position{
@ -560,18 +632,36 @@ fn processJsonRpc(parser: *std.json.Parser, json: []const u8, config: Config) !v
try respondGeneric(id, no_completions_response);
}
} else if (std.mem.eql(u8, method, "textDocument/signatureHelp")) {
// try respondGeneric(id,
// \\,"result":{"signatures":[{
// \\"label": "nameOfFunction(aNumber: u8)",
// \\"documentation": {"kind": "markdown", "value": "Description of the function in **Markdown**!"},
// \\"parameters": [
// \\{"label": [15, 27], "documentation": {"kind": "markdown", "value": "An argument"}}
// \\]
// \\}]}}
// );
try respondGeneric(id,
\\,"result":{"signatures":[]}}
);
} else if (std.mem.eql(u8, method, "textDocument/definition") or
std.mem.eql(u8, method, "textDocument/declaration") or
std.mem.eql(u8, method, "textDocument/typeDefinition"))
{
const document = params.getValue("textDocument").?.Object;
const uri = document.getValue("uri").?.String;
const position = params.getValue("position").?.Object;
const handle = document_store.getHandle(uri) orelse {
std.debug.warn("Trying to got to definition in non existent document {}", .{uri});
return try respondGeneric(id, null_result_response);
};
const pos = types.Position{
.line = position.getValue("line").?.Integer,
.character = position.getValue("character").?.Integer - 1,
};
if (pos.character >= 0) {
const pos_index = try handle.document.positionToIndex(pos);
const pos_context = documentPositionContext(handle.document, pos_index);
switch (pos_context) {
.var_access => try gotoDefinitionGlobal(id, pos_index, handle.*),
.field_access => |start_idx| try gotoDefinitionFieldAccess(id, handle, pos, start_idx),
else => try respondGeneric(id, null_result_response),
}
}
} else if (root.Object.getValue("id")) |_| {
std.debug.warn("Method with return value not implemented: {}", .{method});
try respondGeneric(id, not_implemented_response);

4
src/types.zig
View File

@ -51,7 +51,8 @@ pub const NotificationParams = union(enum) {
/// Params of a response (result)
pub const ResponseParams = union(enum) {
CompletionList: CompletionList
CompletionList: CompletionList,
Location: Location,
};
/// JSONRPC error
@ -282,4 +283,3 @@ pub const CompletionItem = struct {
documentation: ?MarkupContent = null
// filterText: String = .NotDefined,
};