config: migrate flow parser into the main parser object
I think I am actually going to make this a method of the ParserState struct soon so lol check out my freaking code churn. But here we are.
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585
src/config.zig
585
src/config.zig
@ -566,8 +566,10 @@ pub const Parser = struct {
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EmptyDocument,
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DuplicateKey,
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BadMapEntry,
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BadState,
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BadToken,
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Fail,
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} || LineTokenizer(FixedLineBuffer).Error || FlowParser.Error || std.mem.Allocator.Error;
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} || LineTokenizer(FixedLineBuffer).Error || std.mem.Allocator.Error;
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pub const DuplicateKeyBehavior = enum {
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use_first,
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@ -679,11 +681,11 @@ pub const Parser = struct {
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state = .value;
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},
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.flow_list => |str| {
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document.root = try parseFlowList(arena_alloc, str, self.dupe_behavior);
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document.root = try parseFlow(arena_alloc, str, .flow_list, self.dupe_behavior);
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state = .done;
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},
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.flow_map => |str| {
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document.root = try parseFlowMap(arena_alloc, str, self.dupe_behavior);
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document.root = try parseFlow(arena_alloc, str, .flow_map, self.dupe_behavior);
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state = .done;
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},
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},
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@ -705,11 +707,11 @@ pub const Parser = struct {
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state = .value;
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},
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.flow_list => |str| {
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try document.root.list.append(try parseFlowList(arena_alloc, str, self.dupe_behavior));
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try document.root.list.append(try parseFlow(arena_alloc, str, .flow_list, self.dupe_behavior));
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state = .value;
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},
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.flow_map => |str| {
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try document.root.list.append(try parseFlowMap(arena_alloc, str, self.dupe_behavior));
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try document.root.list.append(try parseFlow(arena_alloc, str, .flow_map, self.dupe_behavior));
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state = .value;
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},
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}
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@ -743,11 +745,11 @@ pub const Parser = struct {
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state = .value;
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},
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.flow_list => |str| {
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try document.root.map.put(pair.key, try parseFlowList(arena_alloc, str, self.dupe_behavior));
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try document.root.map.put(pair.key, try parseFlow(arena_alloc, str, .flow_list, self.dupe_behavior));
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state = .value;
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},
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.flow_map => |str| {
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try document.root.map.put(pair.key, try parseFlowMap(arena_alloc, str, self.dupe_behavior));
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try document.root.map.put(pair.key, try parseFlow(arena_alloc, str, .flow_map, self.dupe_behavior));
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state = .value;
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},
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}
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@ -833,8 +835,8 @@ pub const Parser = struct {
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switch (in_line) {
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.empty => unreachable,
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.scalar => |str| try list.append(try Value.fromScalar(arena_alloc, str)),
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.flow_list => |str| try list.append(try parseFlowList(arena_alloc, str, self.dupe_behavior)),
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.flow_map => |str| try list.append(try parseFlowMap(arena_alloc, str, self.dupe_behavior)),
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.flow_list => |str| try list.append(try parseFlow(arena_alloc, str, .flow_list, self.dupe_behavior)),
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.flow_map => |str| try list.append(try parseFlow(arena_alloc, str, .flow_map, self.dupe_behavior)),
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.line_string, .space_string => |str| {
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// string pushes the stack
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const new_string = try appendListGetValue(list, try Value.fromString(arena_alloc, str));
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@ -852,8 +854,8 @@ pub const Parser = struct {
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.empty => expect_shift = .indent,
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.scalar => |str| try list.append(try Value.fromScalar(arena_alloc, str)),
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.line_string, .space_string => |str| try list.append(try Value.fromString(arena_alloc, str)),
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.flow_list => |str| try list.append(try parseFlowList(arena_alloc, str, self.dupe_behavior)),
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.flow_map => |str| try list.append(try parseFlowMap(arena_alloc, str, self.dupe_behavior)),
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.flow_list => |str| try list.append(try parseFlow(arena_alloc, str, .flow_list, self.dupe_behavior)),
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.flow_map => |str| try list.append(try parseFlow(arena_alloc, str, .flow_map, self.dupe_behavior)),
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}
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} else if (line.indent == .indent) {
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if (expect_shift != .indent) return error.UnexpectedIndent;
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@ -924,9 +926,9 @@ pub const Parser = struct {
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switch (in_line) {
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.empty => unreachable,
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.scalar => |str| try putMap(map, dangling_key.?, try Value.fromScalar(arena_alloc, str), self.dupe_behavior),
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.flow_list => |str| try putMap(map, dangling_key.?, try parseFlowList(arena_alloc, str, self.dupe_behavior), self.dupe_behavior),
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.flow_list => |str| try putMap(map, dangling_key.?, try parseFlow(arena_alloc, str, .flow_list, self.dupe_behavior), self.dupe_behavior),
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.flow_map => |str| {
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try putMap(map, dangling_key.?, try parseFlowMap(arena_alloc, str, self.dupe_behavior), self.dupe_behavior);
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try putMap(map, dangling_key.?, try parseFlow(arena_alloc, str, .flow_map, self.dupe_behavior), self.dupe_behavior);
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},
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.line_string, .space_string => |str| {
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// string pushes the stack
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@ -967,8 +969,8 @@ pub const Parser = struct {
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},
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.scalar => |str| try putMap(map, pair.key, try Value.fromScalar(arena_alloc, str), self.dupe_behavior),
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.line_string, .space_string => |str| try putMap(map, pair.key, try Value.fromString(arena_alloc, str), self.dupe_behavior),
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.flow_list => |str| try putMap(map, pair.key, try parseFlowList(arena_alloc, str, self.dupe_behavior), self.dupe_behavior),
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.flow_map => |str| try putMap(map, pair.key, try parseFlowMap(arena_alloc, str, self.dupe_behavior), self.dupe_behavior),
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.flow_list => |str| try putMap(map, pair.key, try parseFlow(arena_alloc, str, .flow_list, self.dupe_behavior), self.dupe_behavior),
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.flow_map => |str| try putMap(map, pair.key, try parseFlow(arena_alloc, str, .flow_map, self.dupe_behavior), self.dupe_behavior),
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}
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} else if (line.indent == .indent) {
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if (expect_shift != .indent or dangling_key == null) return error.UnexpectedValue;
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@ -1013,18 +1015,261 @@ pub const Parser = struct {
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return document;
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}
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fn parseFlowList(alloc: std.mem.Allocator, contents: []const u8, dupe_behavior: DuplicateKeyBehavior) Error!Value {
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var parser = try FlowParser.initList(alloc, contents);
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defer parser.deinit();
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const FlowStackItem = struct {
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value: *Value,
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// lists need this. maps do also for keys and values.
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item_start: usize = 0,
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};
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return try parser.parse(dupe_behavior);
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const FlowStack: type = std.ArrayList(FlowStackItem);
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inline fn getStackTip(stack: FlowStack) Error!*FlowStackItem {
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if (stack.items.len == 0) return error.BadState;
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return &stack.items[stack.items.len - 1];
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}
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fn parseFlowMap(alloc: std.mem.Allocator, contents: []const u8, dupe_behavior: DuplicateKeyBehavior) Error!Value {
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var parser = try FlowParser.initMap(alloc, contents);
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defer parser.deinit();
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inline fn setStackItemStart(stack: FlowStack, start: usize) Error!void {
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if (stack.items.len == 0) return error.BadState;
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stack.items[stack.items.len - 1].item_start = start;
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}
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return try parser.parse(dupe_behavior);
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inline fn popStack(stack: *FlowStack) Error!FlowParseState {
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if (stack.popOrNull() == null)
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return error.BadState;
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const parent = stack.getLastOrNull() orelse return .done;
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return switch (parent.value.*) {
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.flow_list => .want_list_separator,
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.flow_map => .want_map_separator,
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else => return error.BadState,
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};
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}
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const FlowParseState = enum {
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want_list_item,
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consuming_list_item,
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want_list_separator,
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want_map_key,
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consuming_map_key,
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want_map_value,
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consuming_map_value,
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want_map_separator,
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done,
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};
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pub fn parseFlow(
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alloc: std.mem.Allocator,
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contents: []const u8,
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root_type: Value.TagType,
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dupe_behavior: DuplicateKeyBehavior,
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) Error!Value {
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// prime the stack:
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var root: Value = switch (root_type) {
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.flow_list => Value.newFlowList(alloc),
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.flow_map => Value.newFlowMap(alloc),
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else => return error.BadState,
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};
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var state: FlowParseState = switch (root_type) {
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.flow_list => .want_list_item,
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.flow_map => .want_map_key,
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else => unreachable,
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};
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var stack = try FlowStack.initCapacity(alloc, 1);
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stack.appendAssumeCapacity(.{ .value = &root });
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var dangling_key: ?[]const u8 = null;
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charloop: for (contents, 0..) |char, idx| {
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switch (state) {
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.want_list_item => switch (char) {
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' ', '\t' => continue :charloop,
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',' => {
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// empty value
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const tip = try getStackTip(stack);
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try tip.value.flow_list.append(Value.newScalar(alloc));
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tip.item_start = idx + 1;
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},
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'{' => {
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const tip = try getStackTip(stack);
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const new_map = try Parser.appendListGetValue(
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&tip.value.flow_list,
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Value.newFlowMap(alloc),
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);
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tip.item_start = idx;
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try stack.append(.{ .value = new_map });
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state = .want_map_key;
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},
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'[' => {
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const tip = try getStackTip(stack);
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const new_list = try Parser.appendListGetValue(
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&tip.value.flow_list,
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Value.newFlowList(alloc),
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);
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tip.item_start = idx;
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try stack.append(.{ .value = new_list, .item_start = idx + 1 });
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state = .want_list_item;
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},
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']' => {
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const finished = stack.getLastOrNull() orelse return error.BadState;
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if (finished.value.flow_list.items.len > 0 or idx > finished.item_start)
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try finished.value.flow_list.append(Value.newScalar(alloc));
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state = try popStack(&stack);
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},
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else => {
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try setStackItemStart(stack, idx);
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state = .consuming_list_item;
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},
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},
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.consuming_list_item => switch (char) {
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',' => {
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const tip = try getStackTip(stack);
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try tip.value.flow_list.append(
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try Value.fromScalar(alloc, contents[tip.item_start..idx]),
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);
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tip.item_start = idx + 1;
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state = .want_list_item;
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},
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']' => {
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const finished = stack.getLastOrNull() orelse return error.BadState;
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try finished.value.flow_list.append(
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try Value.fromScalar(alloc, contents[finished.item_start..idx]),
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);
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state = try popStack(&stack);
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},
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else => continue :charloop,
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},
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.want_list_separator => switch (char) {
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' ', '\t' => continue :charloop,
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',' => {
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try setStackItemStart(stack, idx);
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state = .want_list_item;
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},
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']' => state = try popStack(&stack),
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else => return error.BadToken,
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},
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.want_map_key => switch (char) {
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' ', '\t' => continue :charloop,
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// forbid these characters so that flow dictionary keys cannot start
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// with characters that regular dictionary keys cannot start with
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// (even though they're unambiguous in this specific context).
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'{', '[', '#', '-', '>', '|', ',' => return error.BadToken,
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':' => {
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// we have an empty map key
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dangling_key = "";
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state = .want_map_value;
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},
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'}' => state = try popStack(&stack),
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else => {
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try setStackItemStart(stack, idx);
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state = .consuming_map_key;
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},
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},
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.consuming_map_key => switch (char) {
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':' => {
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const tip = try getStackTip(stack);
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dangling_key = try alloc.dupe(u8, contents[tip.item_start..idx]);
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state = .want_map_value;
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},
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else => continue :charloop,
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},
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.want_map_value => switch (char) {
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' ', '\t' => continue :charloop,
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',' => {
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const tip = try getStackTip(stack);
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try Parser.putMap(
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&tip.value.flow_map,
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dangling_key.?,
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Value.newScalar(alloc),
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dupe_behavior,
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);
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dangling_key = null;
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state = .want_map_key;
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},
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'[' => {
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const tip = try getStackTip(stack);
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const new_list = try Parser.putMapGetValue(
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&tip.value.flow_map,
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dangling_key.?,
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Value.newFlowList(alloc),
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dupe_behavior,
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);
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try stack.append(.{ .value = new_list, .item_start = idx + 1 });
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dangling_key = null;
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state = .want_list_item;
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},
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'{' => {
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const tip = try getStackTip(stack);
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const new_map = try Parser.putMapGetValue(
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&tip.value.flow_map,
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dangling_key.?,
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Value.newFlowMap(alloc),
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dupe_behavior,
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);
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try stack.append(.{ .value = new_map });
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dangling_key = null;
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state = .want_map_key;
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},
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'}' => {
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// the value is an empty string and this map is closed
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const tip = try getStackTip(stack);
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try Parser.putMap(
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&tip.value.flow_map,
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dangling_key.?,
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Value.newScalar(alloc),
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dupe_behavior,
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);
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dangling_key = null;
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state = try popStack(&stack);
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},
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else => {
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try setStackItemStart(stack, idx);
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state = .consuming_map_value;
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},
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},
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.consuming_map_value => switch (char) {
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',', '}' => |term| {
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const tip = try getStackTip(stack);
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try Parser.putMap(
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&tip.value.flow_map,
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dangling_key.?,
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try Value.fromScalar(alloc, contents[tip.item_start..idx]),
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dupe_behavior,
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);
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dangling_key = null;
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state = .want_map_key;
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if (term == '}') state = try popStack(&stack);
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},
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else => continue :charloop,
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},
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.want_map_separator => switch (char) {
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' ', '\t' => continue :charloop,
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',' => state = .want_map_key,
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'}' => state = try popStack(&stack),
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else => return error.BadToken,
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},
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// the root value was closed but there are characters remaining
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// in the buffer
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.done => return error.BadState,
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}
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}
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// we ran out of characters while still in the middle of an object
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if (state != .done) return error.BadState;
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return root;
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}
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inline fn appendListGetValue(list: *Value.List, value: Value) Error!*Value {
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@ -1094,297 +1339,3 @@ pub const Parser = struct {
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});
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}
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};
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pub const FlowParser = struct {
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const FlowStackItem = struct {
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value: *Value,
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// lists need this. maps do also for keys and values.
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item_start: usize = 0,
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};
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const FlowStack: type = std.ArrayList(FlowStackItem);
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buffer: []const u8,
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root: Value,
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alloc: std.mem.Allocator,
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stack: FlowStack,
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state: ParseState,
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// make this an ugly state machine parser
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const ParseState = enum {
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want_list_item,
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consuming_list_item,
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want_list_separator,
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want_map_key,
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consuming_map_key,
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want_map_value,
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consuming_map_value,
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want_map_separator,
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done,
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};
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const Error = error{
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BadState,
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BadToken,
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} || std.mem.Allocator.Error;
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pub fn initList(alloc: std.mem.Allocator, buffer: []const u8) Error!FlowParser {
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return .{
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.buffer = buffer,
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.root = undefined,
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.alloc = alloc,
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.stack = undefined,
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.state = .want_list_item,
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};
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}
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pub fn initMap(alloc: std.mem.Allocator, buffer: []const u8) Error!FlowParser {
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return .{
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.buffer = buffer,
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.root = undefined,
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.alloc = alloc,
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.stack = undefined,
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.state = .want_map_key,
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};
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}
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pub fn deinit(self: *FlowParser) void {
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self.stack.deinit();
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}
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inline fn getStackTip(stack: FlowStack) Error!*FlowStackItem {
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if (stack.items.len == 0) return error.BadState;
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return &stack.items[stack.items.len - 1];
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}
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inline fn setStackItemStart(stack: FlowStack, start: usize) Error!void {
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if (stack.items.len == 0) return error.BadState;
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stack.items[stack.items.len - 1].item_start = start;
|
||||
}
|
||||
|
||||
inline fn popStack(self: *FlowParser) Parser.Error!ParseState {
|
||||
if (self.stack.popOrNull() == null)
|
||||
return error.BadState;
|
||||
|
||||
const parent = self.stack.getLastOrNull() orelse return .done;
|
||||
|
||||
return switch (parent.value.*) {
|
||||
.flow_list => .want_list_separator,
|
||||
.flow_map => .want_map_separator,
|
||||
else => return error.BadState,
|
||||
};
|
||||
}
|
||||
|
||||
pub fn parse(self: *FlowParser, dupe_behavior: Parser.DuplicateKeyBehavior) Parser.Error!Value {
|
||||
// prime the stack:
|
||||
switch (self.state) {
|
||||
.want_list_item => {
|
||||
self.root = Value.newFlowList(self.alloc);
|
||||
self.stack = try FlowStack.initCapacity(self.alloc, 1);
|
||||
self.stack.appendAssumeCapacity(.{ .value = &self.root });
|
||||
},
|
||||
.want_map_key => {
|
||||
self.root = Value.newFlowMap(self.alloc);
|
||||
self.stack = try FlowStack.initCapacity(self.alloc, 1);
|
||||
self.stack.appendAssumeCapacity(.{ .value = &self.root });
|
||||
},
|
||||
else => {
|
||||
return error.BadState;
|
||||
},
|
||||
}
|
||||
|
||||
var dangling_key: ?[]const u8 = null;
|
||||
|
||||
charloop: for (self.buffer, 0..) |char, idx| {
|
||||
// std.debug.print("{s} => {c}\n", .{ @tagName(self.state), char });
|
||||
switch (self.state) {
|
||||
.want_list_item => switch (char) {
|
||||
' ', '\t' => continue :charloop,
|
||||
',' => {
|
||||
// empty value
|
||||
const tip = try getStackTip(self.stack);
|
||||
try tip.value.flow_list.append(Value.newScalar(self.alloc));
|
||||
tip.item_start = idx + 1;
|
||||
},
|
||||
'{' => {
|
||||
const tip = try getStackTip(self.stack);
|
||||
|
||||
const new_map = try Parser.appendListGetValue(
|
||||
&tip.value.flow_list,
|
||||
Value.newFlowMap(self.alloc),
|
||||
);
|
||||
|
||||
tip.item_start = idx;
|
||||
try self.stack.append(.{ .value = new_map });
|
||||
self.state = .want_map_key;
|
||||
},
|
||||
'[' => {
|
||||
const tip = try getStackTip(self.stack);
|
||||
|
||||
const new_list = try Parser.appendListGetValue(
|
||||
&tip.value.flow_list,
|
||||
Value.newFlowList(self.alloc),
|
||||
);
|
||||
|
||||
tip.item_start = idx;
|
||||
try self.stack.append(.{ .value = new_list, .item_start = idx + 1 });
|
||||
self.state = .want_list_item;
|
||||
},
|
||||
']' => {
|
||||
const finished = self.stack.getLastOrNull() orelse return error.BadState;
|
||||
if (finished.value.flow_list.items.len > 0 or idx > finished.item_start)
|
||||
try finished.value.flow_list.append(Value.newScalar(self.alloc));
|
||||
self.state = try self.popStack();
|
||||
},
|
||||
else => {
|
||||
try setStackItemStart(self.stack, idx);
|
||||
self.state = .consuming_list_item;
|
||||
},
|
||||
},
|
||||
.consuming_list_item => switch (char) {
|
||||
',' => {
|
||||
const tip = try getStackTip(self.stack);
|
||||
|
||||
try tip.value.flow_list.append(
|
||||
try Value.fromScalar(self.alloc, self.buffer[tip.item_start..idx]),
|
||||
);
|
||||
tip.item_start = idx + 1;
|
||||
|
||||
self.state = .want_list_item;
|
||||
},
|
||||
']' => {
|
||||
const finished = self.stack.getLastOrNull() orelse return error.BadState;
|
||||
try finished.value.flow_list.append(
|
||||
try Value.fromScalar(self.alloc, self.buffer[finished.item_start..idx]),
|
||||
);
|
||||
self.state = try self.popStack();
|
||||
},
|
||||
else => continue :charloop,
|
||||
},
|
||||
.want_list_separator => switch (char) {
|
||||
' ', '\t' => continue :charloop,
|
||||
',' => {
|
||||
try setStackItemStart(self.stack, idx);
|
||||
self.state = .want_list_item;
|
||||
},
|
||||
']' => self.state = try self.popStack(),
|
||||
else => return error.BadToken,
|
||||
},
|
||||
.want_map_key => switch (char) {
|
||||
' ', '\t' => continue :charloop,
|
||||
// forbid these characters so that flow dictionary keys cannot start
|
||||
// with characters that regular dictionary keys cannot start with
|
||||
// (even though they're unambiguous in this specific context).
|
||||
'{', '[', '#', '-', '>', '|', ',' => return error.BadToken,
|
||||
':' => {
|
||||
// we have an empty map key
|
||||
dangling_key = "";
|
||||
self.state = .want_map_value;
|
||||
},
|
||||
'}' => self.state = try self.popStack(),
|
||||
else => {
|
||||
try setStackItemStart(self.stack, idx);
|
||||
self.state = .consuming_map_key;
|
||||
},
|
||||
},
|
||||
.consuming_map_key => switch (char) {
|
||||
':' => {
|
||||
const tip = try getStackTip(self.stack);
|
||||
dangling_key = try self.alloc.dupe(u8, self.buffer[tip.item_start..idx]);
|
||||
|
||||
self.state = .want_map_value;
|
||||
},
|
||||
else => continue :charloop,
|
||||
},
|
||||
.want_map_value => switch (char) {
|
||||
' ', '\t' => continue :charloop,
|
||||
',' => {
|
||||
const tip = try getStackTip(self.stack);
|
||||
try Parser.putMap(
|
||||
&tip.value.flow_map,
|
||||
dangling_key.?,
|
||||
Value.newScalar(self.alloc),
|
||||
dupe_behavior,
|
||||
);
|
||||
|
||||
dangling_key = null;
|
||||
self.state = .want_map_key;
|
||||
},
|
||||
'[' => {
|
||||
const tip = try getStackTip(self.stack);
|
||||
|
||||
const new_list = try Parser.putMapGetValue(
|
||||
&tip.value.flow_map,
|
||||
dangling_key.?,
|
||||
Value.newFlowList(self.alloc),
|
||||
dupe_behavior,
|
||||
);
|
||||
|
||||
try self.stack.append(.{ .value = new_list, .item_start = idx + 1 });
|
||||
dangling_key = null;
|
||||
self.state = .want_list_item;
|
||||
},
|
||||
'{' => {
|
||||
const tip = try getStackTip(self.stack);
|
||||
|
||||
const new_map = try Parser.putMapGetValue(
|
||||
&tip.value.flow_map,
|
||||
dangling_key.?,
|
||||
Value.newFlowMap(self.alloc),
|
||||
dupe_behavior,
|
||||
);
|
||||
|
||||
try self.stack.append(.{ .value = new_map });
|
||||
dangling_key = null;
|
||||
self.state = .want_map_key;
|
||||
},
|
||||
'}' => {
|
||||
// the value is an empty string and this map is closed
|
||||
const tip = try getStackTip(self.stack);
|
||||
try Parser.putMap(
|
||||
&tip.value.flow_map,
|
||||
dangling_key.?,
|
||||
Value.newScalar(self.alloc),
|
||||
dupe_behavior,
|
||||
);
|
||||
|
||||
dangling_key = null;
|
||||
self.state = try self.popStack();
|
||||
},
|
||||
else => {
|
||||
try setStackItemStart(self.stack, idx);
|
||||
self.state = .consuming_map_value;
|
||||
},
|
||||
},
|
||||
.consuming_map_value => switch (char) {
|
||||
',', '}' => |term| {
|
||||
const tip = try getStackTip(self.stack);
|
||||
try Parser.putMap(
|
||||
&tip.value.flow_map,
|
||||
dangling_key.?,
|
||||
try Value.fromScalar(self.alloc, self.buffer[tip.item_start..idx]),
|
||||
dupe_behavior,
|
||||
);
|
||||
dangling_key = null;
|
||||
self.state = .want_map_key;
|
||||
if (term == '}') self.state = try self.popStack();
|
||||
},
|
||||
else => continue :charloop,
|
||||
},
|
||||
.want_map_separator => switch (char) {
|
||||
' ', '\t' => continue :charloop,
|
||||
',' => self.state = .want_map_key,
|
||||
'}' => self.state = try self.popStack(),
|
||||
else => return error.BadToken,
|
||||
},
|
||||
// the root value was closed but there are characters remaining
|
||||
// in the buffer
|
||||
.done => return error.BadState,
|
||||
}
|
||||
}
|
||||
// we ran out of characters while still in the middle of an object
|
||||
if (self.state != .done) return error.BadState;
|
||||
|
||||
return self.root;
|
||||
}
|
||||
};
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user