zls/src/analysis.zig

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const std = @import("std");
const AnalysisContext = @import("document_store.zig").AnalysisContext;
const ast = std.zig.ast;
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/// REALLY BAD CODE, PLEASE DON'T USE THIS!!!!!!! (only for testing)
pub fn getFunctionByName(tree: *ast.Tree, name: []const u8) ?*ast.Node.FnProto {
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var decls = tree.root_node.decls.iterator(0);
while (decls.next()) |decl_ptr| {
var decl = decl_ptr.*;
switch (decl.id) {
.FnProto => {
const func = decl.cast(ast.Node.FnProto).?;
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if (std.mem.eql(u8, tree.tokenSlice(func.name_token.?), name)) return func;
},
else => {}
}
}
return null;
}
/// Gets a function's doc comments, caller must free memory when a value is returned
/// Like:
///```zig
///var comments = getFunctionDocComments(allocator, tree, func);
///defer if (comments) |comments_pointer| allocator.free(comments_pointer);
///```
pub fn getDocComments(allocator: *std.mem.Allocator, tree: *ast.Tree, node: *ast.Node) !?[]const u8 {
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switch (node.id) {
.FnProto => {
const func = node.cast(ast.Node.FnProto).?;
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if (func.doc_comments) |doc_comments| {
var doc_it = doc_comments.lines.iterator(0);
var lines = std.ArrayList([]const u8).init(allocator);
defer lines.deinit();
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while (doc_it.next()) |doc_comment| {
_ = try lines.append(std.fmt.trim(tree.tokenSlice(doc_comment.*)[3..]));
}
return try std.mem.join(allocator, "\n", lines.items);
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} else {
return null;
}
},
.VarDecl => {
const var_decl = node.cast(ast.Node.VarDecl).?;
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if (var_decl.doc_comments) |doc_comments| {
var doc_it = doc_comments.lines.iterator(0);
var lines = std.ArrayList([]const u8).init(allocator);
defer lines.deinit();
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while (doc_it.next()) |doc_comment| {
_ = try lines.append(std.fmt.trim(tree.tokenSlice(doc_comment.*)[3..]));
}
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return try std.mem.join(allocator, "\n", lines.items);
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} else {
return null;
}
},
else => return null
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}
}
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/// Gets a function signature (keywords, name, return value)
pub fn getFunctionSignature(tree: *ast.Tree, func: *ast.Node.FnProto) []const u8 {
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const start = tree.tokens.at(func.firstToken()).start;
const end = tree.tokens.at(switch (func.return_type) {
.Explicit, .InferErrorSet => |node| node.lastToken()
}).end;
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return tree.source[start..end];
}
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/// Gets a function snippet insert text
pub fn getFunctionSnippet(allocator: *std.mem.Allocator, tree: *ast.Tree, func: *ast.Node.FnProto) ![]const u8 {
const name_tok = func.name_token orelse unreachable;
var buffer = std.ArrayList(u8).init(allocator);
try buffer.ensureCapacity(128);
try buffer.appendSlice(tree.tokenSlice(name_tok));
try buffer.append('(');
var buf_stream = buffer.outStream();
var param_num = @as(usize, 1);
var param_it = func.params.iterator(0);
while (param_it.next()) |param_ptr| : (param_num += 1) {
const param = param_ptr.*;
const param_decl = param.cast(ast.Node.ParamDecl).?;
if (param_num != 1) try buffer.appendSlice(", ${")
else try buffer.appendSlice("${");
try buf_stream.print("{}:", .{param_num});
if (param_decl.comptime_token) |_| {
try buffer.appendSlice("comptime ");
}
if (param_decl.noalias_token) |_| {
try buffer.appendSlice("noalias ");
}
if (param_decl.name_token) |name_token| {
try buffer.appendSlice(tree.tokenSlice(name_token));
try buffer.appendSlice(": ");
}
if (param_decl.var_args_token) |_| {
try buffer.appendSlice("...");
continue;
}
var curr_tok = param_decl.type_node.firstToken();
var end_tok = param_decl.type_node.lastToken();
while (curr_tok <= end_tok) : (curr_tok += 1) {
const id = tree.tokens.at(curr_tok).id;
const is_comma = tree.tokens.at(curr_tok).id == .Comma;
if (curr_tok == end_tok and is_comma) continue;
try buffer.appendSlice(tree.tokenSlice(curr_tok));
if (is_comma or id == .Keyword_const) try buffer.append(' ');
}
try buffer.append('}');
}
try buffer.append(')');
return buffer.toOwnedSlice();
}
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/// Gets a function signature (keywords, name, return value)
pub fn getVariableSignature(tree: *ast.Tree, var_decl: *ast.Node.VarDecl) []const u8 {
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const start = tree.tokens.at(var_decl.firstToken()).start;
const end = tree.tokens.at(var_decl.semicolon_token).start;
// var end =
// if (var_decl.init_n) |body| tree.tokens.at(body.firstToken()).start
// else tree.tokens.at(var_decl.name_token).end;
return tree.source[start..end];
}
// STYLE
pub fn isCamelCase(name: []const u8) bool {
return !std.ascii.isUpper(name[0]) and std.mem.indexOf(u8, name, "_") == null;
}
pub fn isPascalCase(name: []const u8) bool {
return std.ascii.isUpper(name[0]) and std.mem.indexOf(u8, name, "_") == null;
}
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// ANALYSIS ENGINE
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/// Gets the child of node
pub fn getChild(tree: *ast.Tree, node: *ast.Node, name: []const u8) ?*ast.Node {
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var index: usize = 0;
while (node.iterate(index)) |child| {
switch (child.id) {
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.VarDecl => {
const vari = child.cast(ast.Node.VarDecl).?;
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if (std.mem.eql(u8, tree.tokenSlice(vari.name_token), name)) return child;
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},
.FnProto => {
const func = child.cast(ast.Node.FnProto).?;
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if (func.name_token != null and std.mem.eql(u8, tree.tokenSlice(func.name_token.?), name)) return child;
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},
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.ContainerField => {
const field = child.cast(ast.Node.ContainerField).?;
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if (std.mem.eql(u8, tree.tokenSlice(field.name_token), name)) return child;
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},
else => {}
}
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index += 1;
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}
return null;
}
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/// Resolves the type of a node
pub fn resolveTypeOfNode(analysis_ctx: *AnalysisContext, node: *ast.Node) ?*ast.Node {
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switch (node.id) {
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.VarDecl => {
const vari = node.cast(ast.Node.VarDecl).?;
return resolveTypeOfNode(analysis_ctx, vari.type_node orelse vari.init_node.?) orelse null;
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},
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.FnProto => {
const func = node.cast(ast.Node.FnProto).?;
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switch (func.return_type) {
.Explicit, .InferErrorSet => |return_type| return resolveTypeOfNode(analysis_ctx, return_type),
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}
},
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.Identifier => {
if (getChild(analysis_ctx.tree, &analysis_ctx.tree.root_node.base, analysis_ctx.tree.getNodeSource(node))) |child| {
return resolveTypeOfNode(analysis_ctx, child);
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} else return null;
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},
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.ContainerDecl => {
return node;
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},
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.ContainerField => {
const field = node.cast(ast.Node.ContainerField).?;
return resolveTypeOfNode(analysis_ctx, field.type_expr.?);
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},
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.SuffixOp => {
const suffix_op = node.cast(ast.Node.SuffixOp).?;
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switch (suffix_op.op) {
.Call => {
return resolveTypeOfNode(analysis_ctx, suffix_op.lhs.node);
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},
else => {}
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}
},
.InfixOp => {
const infix_op = node.cast(ast.Node.InfixOp).?;
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switch (infix_op.op) {
.Period => {
// Save the child string from this tree since the tree may switch when processing
// an import lhs.
var rhs_str = nodeToString(analysis_ctx.tree, infix_op.rhs) orelse return null;
// Use the analysis context temporary arena to store the rhs string.
rhs_str = std.mem.dupe(&analysis_ctx.arena.allocator, u8, rhs_str) catch return null;
const left = resolveTypeOfNode(analysis_ctx, infix_op.lhs) orelse return null;
return getChild(analysis_ctx.tree, left, rhs_str);
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},
else => {}
}
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},
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.PrefixOp => {
const prefix_op = node.cast(ast.Node.PrefixOp).?;
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switch (prefix_op.op) {
.PtrType => {
return resolveTypeOfNode(analysis_ctx, prefix_op.rhs);
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},
else => {}
}
},
.BuiltinCall => {
const builtin_call = node.cast(ast.Node.BuiltinCall).?;
if (!std.mem.eql(u8, analysis_ctx.tree.tokenSlice(builtin_call.builtin_token), "@import")) return null;
if (builtin_call.params.len > 1) return null;
const import_param = builtin_call.params.at(0).*;
if (import_param.id != .StringLiteral) return null;
const import_str = analysis_ctx.tree.tokenSlice(import_param.cast(ast.Node.StringLiteral).?.token);
return analysis_ctx.onImport(import_str[1 .. import_str.len - 1]) catch |err| block: {
std.debug.warn("Error {} while proessing import {}\n", .{err, import_str});
break :block null;
};
},
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else => {
std.debug.warn("Type resolution case not implemented; {}\n", .{node.id});
}
}
return null;
}
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fn maybeCollectImport(tree: *ast.Tree, builtin_call: *ast.Node.BuiltinCall, arr: *std.ArrayList([]const u8)) !void {
if (!std.mem.eql(u8, tree.tokenSlice(builtin_call.builtin_token), "@import")) return;
if (builtin_call.params.len > 1) return;
const import_param = builtin_call.params.at(0).*;
if (import_param.id != .StringLiteral) return;
const import_str = tree.tokenSlice(import_param.cast(ast.Node.StringLiteral).?.token);
try arr.append(import_str[1 .. import_str.len - 1]);
}
/// Collects all imports we can find into a slice of import paths (without quotes).
/// The import paths are valid as long as the tree is.
pub fn collectImports(allocator: *std.mem.Allocator, tree: *ast.Tree) ![][]const u8 {
// TODO: Currently only detects `const smth = @import("string literal")<.SometThing>;`
var arr = std.ArrayList([]const u8).init(allocator);
var idx: usize = 0;
while (tree.root_node.iterate(idx)) |decl| : (idx += 1) {
if (decl.id != .VarDecl) continue;
const var_decl = decl.cast(ast.Node.VarDecl).?;
if (var_decl.init_node == null) continue;
switch(var_decl.init_node.?.id) {
.BuiltinCall => {
const builtin_call = var_decl.init_node.?.cast(ast.Node.BuiltinCall).?;
try maybeCollectImport(tree, builtin_call, &arr);
},
.InfixOp => {
const infix_op = var_decl.init_node.?.cast(ast.Node.InfixOp).?;
switch(infix_op.op) {
.Period => {},
else => continue,
}
if (infix_op.lhs.id != .BuiltinCall) continue;
try maybeCollectImport(tree, infix_op.lhs.cast(ast.Node.BuiltinCall).?, &arr);
},
else => {},
}
}
return arr.toOwnedSlice();
}
pub fn getFieldAccessTypeNode(analysis_ctx: *AnalysisContext, tokenizer: *std.zig.Tokenizer) ?*ast.Node {
var current_node = &analysis_ctx.tree.root_node.base;
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while (true) {
var next = tokenizer.next();
switch (next.id) {
.Eof => {
return current_node;
},
.Identifier => {
// var root = current_node.cast(ast.Node.Root).?;
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// current_node.
if (getChild(analysis_ctx.tree, current_node, tokenizer.buffer[next.start..next.end])) |child| {
if (resolveTypeOfNode(analysis_ctx, child)) |node_type| {
current_node = node_type;
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} else return null;
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} else return null;
},
.Period => {
var after_period = tokenizer.next();
if (after_period.id == .Eof) {
return current_node;
} else if (after_period.id == .Identifier) {
if (getChild(analysis_ctx.tree, current_node, tokenizer.buffer[after_period.start..after_period.end])) |child| {
if (resolveTypeOfNode(analysis_ctx, child)) |child_type| {
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current_node = child_type;
} else return null;
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} else return null;
}
},
else => {
std.debug.warn("Not implemented; {}\n", .{next.id});
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}
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}
}
return current_node;
}
pub fn getCompletionsFromNode(allocator: *std.mem.Allocator, tree: *ast.Tree, node: *ast.Node) ![]*ast.Node {
var nodes = std.ArrayList(*ast.Node).init(allocator);
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var index: usize = 0;
while (node.iterate(index)) |child_node| {
try nodes.append(child_node);
index += 1;
}
return nodes.items;
}
pub fn nodeToString(tree: *ast.Tree, node: *ast.Node) ?[]const u8 {
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switch (node.id) {
.ContainerField => {
const field = node.cast(ast.Node.ContainerField).?;
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return tree.tokenSlice(field.name_token);
},
.Identifier => {
const field = node.cast(ast.Node.Identifier).?;
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return tree.tokenSlice(field.token);
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},
.FnProto => {
const func = node.cast(ast.Node.FnProto).?;
if (func.name_token) |name_token| {
return tree.tokenSlice(name_token);
}
},
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else => {
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std.debug.warn("INVALID: {}\n", .{node.id});
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}
}
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return null;
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}
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pub fn nodesToString(tree: *ast.Tree, maybe_nodes: ?[]*ast.Node) void {
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if (maybe_nodes) |nodes| {
for (nodes) |node| {
std.debug.warn("- {}\n", .{nodeToString(tree, node)});
}
} else std.debug.warn("No nodes\n", .{});
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}