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