677 lines
28 KiB
Zig
677 lines
28 KiB
Zig
const std = @import("std");
|
|
const mem = std.mem;
|
|
const Allocator = std.mem.Allocator;
|
|
const assert = std.debug.assert;
|
|
|
|
// This file is largely a copy of std.json
|
|
|
|
const StreamingParser = std.json.StreamingParser;
|
|
const Token = std.json.Token;
|
|
const unescapeValidString = std.json.unescapeValidString;
|
|
const UnescapeValidStringError = std.json.UnescapeValidStringError;
|
|
|
|
pub fn parse(comptime T: type, body: []const u8, alloc: std.mem.Allocator) !T {
|
|
var tokens = TokenStream.init(body);
|
|
|
|
const options = ParseOptions{ .allocator = alloc };
|
|
|
|
const token = (try tokens.next()) orelse return error.UnexpectedEndOfJson;
|
|
const r = try parseInternal(T, token, &tokens, options);
|
|
errdefer parseFreeInternal(T, r, options);
|
|
if (!options.allow_trailing_data) {
|
|
if ((try tokens.next()) != null) unreachable;
|
|
assert(tokens.i >= tokens.slice.len);
|
|
}
|
|
return r;
|
|
}
|
|
|
|
pub fn parseFree(value: anytype, alloc: std.mem.Allocator) void {
|
|
parseFreeInternal(@TypeOf(value), value, .{ .allocator = alloc });
|
|
}
|
|
|
|
// WARNING: the objects "parse" method must not contain a reference to the original value
|
|
fn hasCustomParse(comptime T: type) bool {
|
|
if (!std.meta.trait.hasFn("parse")(T)) return false;
|
|
if (!@hasDecl(T, "JsonParseAs")) return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
///// The rest is (modified) from std.json
|
|
|
|
/// A small wrapper over a StreamingParser for full slices. Returns a stream of json Tokens.
|
|
pub const TokenStream = struct {
|
|
i: usize,
|
|
slice: []const u8,
|
|
parser: StreamingParser,
|
|
token: ?Token,
|
|
|
|
pub const Error = StreamingParser.Error || error{UnexpectedEndOfJson};
|
|
|
|
pub fn init(slice: []const u8) TokenStream {
|
|
return TokenStream{
|
|
.i = 0,
|
|
.slice = slice,
|
|
.parser = StreamingParser.init(),
|
|
.token = null,
|
|
};
|
|
}
|
|
|
|
fn stackUsed(self: *TokenStream) usize {
|
|
return self.parser.stack.len + if (self.token != null) @as(usize, 1) else 0;
|
|
}
|
|
|
|
pub fn next(self: *TokenStream) Error!?Token {
|
|
if (self.token) |token| {
|
|
self.token = null;
|
|
return token;
|
|
}
|
|
|
|
var t1: ?Token = undefined;
|
|
var t2: ?Token = undefined;
|
|
|
|
while (self.i < self.slice.len) {
|
|
try self.parser.feed(self.slice[self.i], &t1, &t2);
|
|
self.i += 1;
|
|
|
|
if (t1) |token| {
|
|
self.token = t2;
|
|
return token;
|
|
}
|
|
}
|
|
|
|
// Without this a bare number fails, the streaming parser doesn't know the input ended
|
|
try self.parser.feed(' ', &t1, &t2);
|
|
self.i += 1;
|
|
|
|
if (t1) |token| {
|
|
return token;
|
|
} else if (self.parser.complete) {
|
|
return null;
|
|
} else {
|
|
return error.UnexpectedEndOfJson;
|
|
}
|
|
}
|
|
};
|
|
|
|
/// Checks to see if a string matches what it would be as a json-encoded string
|
|
/// Assumes that `encoded` is a well-formed json string
|
|
fn encodesTo(decoded: []const u8, encoded: []const u8) bool {
|
|
var i: usize = 0;
|
|
var j: usize = 0;
|
|
while (i < decoded.len) {
|
|
if (j >= encoded.len) return false;
|
|
if (encoded[j] != '\\') {
|
|
if (decoded[i] != encoded[j]) return false;
|
|
j += 1;
|
|
i += 1;
|
|
} else {
|
|
const escape_type = encoded[j + 1];
|
|
if (escape_type != 'u') {
|
|
const t: u8 = switch (escape_type) {
|
|
'\\' => '\\',
|
|
'/' => '/',
|
|
'n' => '\n',
|
|
'r' => '\r',
|
|
't' => '\t',
|
|
'f' => 12,
|
|
'b' => 8,
|
|
'"' => '"',
|
|
else => unreachable,
|
|
};
|
|
if (decoded[i] != t) return false;
|
|
j += 2;
|
|
i += 1;
|
|
} else {
|
|
var codepoint = std.fmt.parseInt(u21, encoded[j + 2 .. j + 6], 16) catch unreachable;
|
|
j += 6;
|
|
if (codepoint >= 0xD800 and codepoint < 0xDC00) {
|
|
// surrogate pair
|
|
assert(encoded[j] == '\\');
|
|
assert(encoded[j + 1] == 'u');
|
|
const low_surrogate = std.fmt.parseInt(u21, encoded[j + 2 .. j + 6], 16) catch unreachable;
|
|
codepoint = 0x10000 + (((codepoint & 0x03ff) << 10) | (low_surrogate & 0x03ff));
|
|
j += 6;
|
|
}
|
|
var buf: [4]u8 = undefined;
|
|
const len = std.unicode.utf8Encode(codepoint, &buf) catch unreachable;
|
|
if (i + len > decoded.len) return false;
|
|
if (!mem.eql(u8, decoded[i .. i + len], buf[0..len])) return false;
|
|
i += len;
|
|
}
|
|
}
|
|
}
|
|
assert(i == decoded.len);
|
|
assert(j == encoded.len);
|
|
return true;
|
|
}
|
|
|
|
/// parse tokens from a stream, returning `false` if they do not decode to `value`
|
|
fn parsesTo(comptime T: type, value: T, tokens: *TokenStream, options: ParseOptions) !bool {
|
|
// TODO: should be able to write this function to not require an allocator
|
|
const tmp = try parse(T, tokens, options);
|
|
defer parseFree(T, tmp, options);
|
|
|
|
return parsedEqual(tmp, value);
|
|
}
|
|
|
|
/// Returns if a value returned by `parse` is deep-equal to another value
|
|
fn parsedEqual(a: anytype, b: @TypeOf(a)) bool {
|
|
switch (@typeInfo(@TypeOf(a))) {
|
|
.Optional => {
|
|
if (a == null and b == null) return true;
|
|
if (a == null or b == null) return false;
|
|
return parsedEqual(a.?, b.?);
|
|
},
|
|
.Union => |info| {
|
|
if (info.tag_type) |UnionTag| {
|
|
const tag_a = std.meta.activeTag(a);
|
|
const tag_b = std.meta.activeTag(b);
|
|
if (tag_a != tag_b) return false;
|
|
|
|
inline for (info.fields) |field_info| {
|
|
if (@field(UnionTag, field_info.name) == tag_a) {
|
|
return parsedEqual(@field(a, field_info.name), @field(b, field_info.name));
|
|
}
|
|
}
|
|
return false;
|
|
} else {
|
|
unreachable;
|
|
}
|
|
},
|
|
.Array => {
|
|
for (a) |e, i|
|
|
if (!parsedEqual(e, b[i])) return false;
|
|
return true;
|
|
},
|
|
.Struct => |info| {
|
|
inline for (info.fields) |field_info| {
|
|
if (!parsedEqual(@field(a, field_info.name), @field(b, field_info.name))) return false;
|
|
}
|
|
return true;
|
|
},
|
|
.Pointer => |ptrInfo| switch (ptrInfo.size) {
|
|
.One => return parsedEqual(a.*, b.*),
|
|
.Slice => {
|
|
if (a.len != b.len) return false;
|
|
for (a) |e, i|
|
|
if (!parsedEqual(e, b[i])) return false;
|
|
return true;
|
|
},
|
|
.Many, .C => unreachable,
|
|
},
|
|
else => return a == b,
|
|
}
|
|
unreachable;
|
|
}
|
|
|
|
const ParseOptions = struct {
|
|
allocator: ?Allocator = null,
|
|
|
|
/// Behaviour when a duplicate field is encountered.
|
|
duplicate_field_behavior: enum {
|
|
UseFirst,
|
|
Error,
|
|
UseLast,
|
|
} = .Error,
|
|
|
|
/// If false, finding an unknown field returns an error.
|
|
ignore_unknown_fields: bool = false,
|
|
|
|
allow_trailing_data: bool = false,
|
|
};
|
|
|
|
const SkipValueError = error{UnexpectedJsonDepth} || TokenStream.Error;
|
|
|
|
fn skipValue(tokens: *TokenStream) SkipValueError!void {
|
|
const original_depth = tokens.stackUsed();
|
|
|
|
// Return an error if no value is found
|
|
_ = try tokens.next();
|
|
if (tokens.stackUsed() < original_depth) return error.UnexpectedJsonDepth;
|
|
if (tokens.stackUsed() == original_depth) return;
|
|
|
|
while (try tokens.next()) |_| {
|
|
if (tokens.stackUsed() == original_depth) return;
|
|
}
|
|
}
|
|
|
|
fn ParseInternalError(comptime T: type) type {
|
|
// `inferred_types` is used to avoid infinite recursion for recursive type definitions.
|
|
const inferred_types = [_]type{};
|
|
return ParseInternalErrorImpl(T, &inferred_types);
|
|
}
|
|
|
|
fn ParseInternalErrorImpl(comptime T: type, comptime inferred_types: []const type) type {
|
|
if (hasCustomParse(T)) {
|
|
return ParseInternalError(T.JsonParseAs) || T.ParseError;
|
|
}
|
|
for (inferred_types) |ty| {
|
|
if (T == ty) return error{};
|
|
}
|
|
|
|
switch (@typeInfo(T)) {
|
|
.Bool => return error{UnexpectedToken},
|
|
.Float, .ComptimeFloat => return error{UnexpectedToken} || std.fmt.ParseFloatError,
|
|
.Int, .ComptimeInt => {
|
|
return error{ UnexpectedToken, InvalidNumber, Overflow } ||
|
|
std.fmt.ParseIntError || std.fmt.ParseFloatError;
|
|
},
|
|
.Optional => |optionalInfo| {
|
|
return ParseInternalErrorImpl(optionalInfo.child, inferred_types ++ [_]type{T});
|
|
},
|
|
.Enum => return error{ UnexpectedToken, InvalidEnumTag } || std.fmt.ParseIntError ||
|
|
std.meta.IntToEnumError || std.meta.IntToEnumError,
|
|
.Union => |unionInfo| {
|
|
if (unionInfo.tag_type) |_| {
|
|
var errors = error{NoUnionMembersMatched};
|
|
for (unionInfo.fields) |u_field| {
|
|
errors = errors || ParseInternalErrorImpl(u_field.field_type, inferred_types ++ [_]type{T});
|
|
}
|
|
return errors;
|
|
} else {
|
|
@compileError("Unable to parse into untagged union '" ++ @typeName(T) ++ "'");
|
|
}
|
|
},
|
|
.Struct => |structInfo| {
|
|
var errors = error{
|
|
DuplicateJSONField,
|
|
UnexpectedEndOfJson,
|
|
UnexpectedToken,
|
|
UnexpectedValue,
|
|
UnknownField,
|
|
MissingField,
|
|
} || SkipValueError || TokenStream.Error;
|
|
for (structInfo.fields) |field| {
|
|
errors = errors || ParseInternalErrorImpl(field.field_type, inferred_types ++ [_]type{T});
|
|
}
|
|
return errors;
|
|
},
|
|
.Array => |arrayInfo| {
|
|
return error{ UnexpectedEndOfJson, UnexpectedToken } || TokenStream.Error ||
|
|
UnescapeValidStringError ||
|
|
ParseInternalErrorImpl(arrayInfo.child, inferred_types ++ [_]type{T});
|
|
},
|
|
.Pointer => |ptrInfo| {
|
|
var errors = error{AllocatorRequired} || std.mem.Allocator.Error;
|
|
switch (ptrInfo.size) {
|
|
.One => {
|
|
return errors || ParseInternalErrorImpl(ptrInfo.child, inferred_types ++ [_]type{T});
|
|
},
|
|
.Slice => {
|
|
return errors || error{ UnexpectedEndOfJson, UnexpectedToken } ||
|
|
ParseInternalErrorImpl(ptrInfo.child, inferred_types ++ [_]type{T}) ||
|
|
UnescapeValidStringError || TokenStream.Error;
|
|
},
|
|
else => @compileError("Unable to parse into type '" ++ @typeName(T) ++ "'"),
|
|
}
|
|
},
|
|
else => return error{},
|
|
}
|
|
unreachable;
|
|
}
|
|
|
|
fn parseInternal(
|
|
comptime T: type,
|
|
token: Token,
|
|
tokens: *TokenStream,
|
|
options: ParseOptions,
|
|
) ParseInternalError(T)!T {
|
|
if (comptime hasCustomParse(T)) {
|
|
const val = try parseInternal(T.JsonParseAs, token, tokens, options);
|
|
defer parseFreeInternal(T.JsonParseAs, val, options);
|
|
return try T.parse(val);
|
|
}
|
|
|
|
switch (@typeInfo(T)) {
|
|
.Bool => {
|
|
return switch (token) {
|
|
.True => true,
|
|
.False => false,
|
|
else => error.UnexpectedToken,
|
|
};
|
|
},
|
|
.Float, .ComptimeFloat => {
|
|
switch (token) {
|
|
.Number => |numberToken| return try std.fmt.parseFloat(T, numberToken.slice(tokens.slice, tokens.i - 1)),
|
|
.String => |stringToken| return try std.fmt.parseFloat(T, stringToken.slice(tokens.slice, tokens.i - 1)),
|
|
else => return error.UnexpectedToken,
|
|
}
|
|
},
|
|
.Int, .ComptimeInt => {
|
|
switch (token) {
|
|
.Number => |numberToken| {
|
|
if (numberToken.is_integer)
|
|
return try std.fmt.parseInt(T, numberToken.slice(tokens.slice, tokens.i - 1), 10);
|
|
const float = try std.fmt.parseFloat(f128, numberToken.slice(tokens.slice, tokens.i - 1));
|
|
if (@round(float) != float) return error.InvalidNumber;
|
|
if (float > std.math.maxInt(T) or float < std.math.minInt(T)) return error.Overflow;
|
|
return @floatToInt(T, float);
|
|
},
|
|
.String => |stringToken| {
|
|
return std.fmt.parseInt(T, stringToken.slice(tokens.slice, tokens.i - 1), 10) catch |err| {
|
|
switch (err) {
|
|
error.Overflow => return err,
|
|
error.InvalidCharacter => {
|
|
const float = try std.fmt.parseFloat(f128, stringToken.slice(tokens.slice, tokens.i - 1));
|
|
if (@round(float) != float) return error.InvalidNumber;
|
|
if (float > std.math.maxInt(T) or float < std.math.minInt(T)) return error.Overflow;
|
|
return @floatToInt(T, float);
|
|
},
|
|
}
|
|
};
|
|
},
|
|
else => return error.UnexpectedToken,
|
|
}
|
|
},
|
|
.Optional => |optionalInfo| {
|
|
if (token == .Null) {
|
|
return null;
|
|
} else {
|
|
return try parseInternal(optionalInfo.child, token, tokens, options);
|
|
}
|
|
},
|
|
.Enum => |enumInfo| {
|
|
switch (token) {
|
|
.Number => |numberToken| {
|
|
if (!numberToken.is_integer) return error.UnexpectedToken;
|
|
const n = try std.fmt.parseInt(enumInfo.tag_type, numberToken.slice(tokens.slice, tokens.i - 1), 10);
|
|
return try std.meta.intToEnum(T, n);
|
|
},
|
|
.String => |stringToken| {
|
|
const source_slice = stringToken.slice(tokens.slice, tokens.i - 1);
|
|
switch (stringToken.escapes) {
|
|
.None => return std.meta.stringToEnum(T, source_slice) orelse return error.InvalidEnumTag,
|
|
.Some => {
|
|
inline for (enumInfo.fields) |field| {
|
|
if (field.name.len == stringToken.decodedLength() and encodesTo(field.name, source_slice)) {
|
|
return @field(T, field.name);
|
|
}
|
|
}
|
|
return error.InvalidEnumTag;
|
|
},
|
|
}
|
|
},
|
|
else => return error.UnexpectedToken,
|
|
}
|
|
},
|
|
.Union => |unionInfo| {
|
|
if (unionInfo.tag_type) |_| {
|
|
// try each of the union fields until we find one that matches
|
|
inline for (unionInfo.fields) |u_field| {
|
|
// take a copy of tokens so we can withhold mutations until success
|
|
var tokens_copy = tokens.*;
|
|
if (parseInternal(u_field.field_type, token, &tokens_copy, options)) |value| {
|
|
tokens.* = tokens_copy;
|
|
return @unionInit(T, u_field.name, value);
|
|
} else |err| {
|
|
// Bubble up error.OutOfMemory
|
|
// Parsing some types won't have OutOfMemory in their
|
|
// error-sets, for the condition to be valid, merge it in.
|
|
if (@as(@TypeOf(err) || error{OutOfMemory}, err) == error.OutOfMemory) return err;
|
|
// Bubble up AllocatorRequired, as it indicates missing option
|
|
if (@as(@TypeOf(err) || error{AllocatorRequired}, err) == error.AllocatorRequired) return err;
|
|
// otherwise continue through the `inline for`
|
|
}
|
|
}
|
|
return error.NoUnionMembersMatched;
|
|
} else {
|
|
@compileError("Unable to parse into untagged union '" ++ @typeName(T) ++ "'");
|
|
}
|
|
},
|
|
.Struct => |structInfo| {
|
|
switch (token) {
|
|
.ObjectBegin => {},
|
|
else => return error.UnexpectedToken,
|
|
}
|
|
var r: T = undefined;
|
|
var fields_seen = [_]bool{false} ** structInfo.fields.len;
|
|
errdefer {
|
|
inline for (structInfo.fields) |field, i| {
|
|
if (fields_seen[i] and !field.is_comptime) {
|
|
parseFreeInternal(field.field_type, @field(r, field.name), options);
|
|
}
|
|
}
|
|
}
|
|
|
|
while (true) {
|
|
switch ((try tokens.next()) orelse return error.UnexpectedEndOfJson) {
|
|
.ObjectEnd => break,
|
|
.String => |stringToken| {
|
|
const key_source_slice = stringToken.slice(tokens.slice, tokens.i - 1);
|
|
var child_options = options;
|
|
child_options.allow_trailing_data = true;
|
|
var found = false;
|
|
inline for (structInfo.fields) |field, i| {
|
|
// TODO: using switches here segfault the compiler (#2727?)
|
|
if ((stringToken.escapes == .None and mem.eql(u8, field.name, key_source_slice)) or (stringToken.escapes == .Some and (field.name.len == stringToken.decodedLength() and encodesTo(field.name, key_source_slice)))) {
|
|
// if (switch (stringToken.escapes) {
|
|
// .None => mem.eql(u8, field.name, key_source_slice),
|
|
// .Some => (field.name.len == stringToken.decodedLength() and encodesTo(field.name, key_source_slice)),
|
|
// }) {
|
|
if (fields_seen[i]) {
|
|
// switch (options.duplicate_field_behavior) {
|
|
// .UseFirst => {},
|
|
// .Error => {},
|
|
// .UseLast => {},
|
|
// }
|
|
if (options.duplicate_field_behavior == .UseFirst) {
|
|
// unconditonally ignore value. for comptime fields, this skips check against default_value
|
|
const next_token = (try tokens.next()) orelse return error.UnexpectedEndOfJson;
|
|
parseFreeInternal(field.field_type, try parseInternal(field.field_type, next_token, tokens, child_options), child_options);
|
|
found = true;
|
|
break;
|
|
} else if (options.duplicate_field_behavior == .Error) {
|
|
return error.DuplicateJSONField;
|
|
} else if (options.duplicate_field_behavior == .UseLast) {
|
|
if (!field.is_comptime) {
|
|
parseFreeInternal(field.field_type, @field(r, field.name), child_options);
|
|
}
|
|
fields_seen[i] = false;
|
|
}
|
|
}
|
|
if (field.is_comptime) {
|
|
if (!try parsesTo(field.field_type, @ptrCast(*const field.field_type, field.default_value.?).*, tokens, child_options)) {
|
|
return error.UnexpectedValue;
|
|
}
|
|
} else {
|
|
const next_token = (try tokens.next()) orelse return error.UnexpectedEndOfJson;
|
|
@field(r, field.name) = try parseInternal(field.field_type, next_token, tokens, child_options);
|
|
}
|
|
fields_seen[i] = true;
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!found) {
|
|
if (options.ignore_unknown_fields) {
|
|
try skipValue(tokens);
|
|
continue;
|
|
} else {
|
|
return error.UnknownField;
|
|
}
|
|
}
|
|
},
|
|
else => return error.UnexpectedToken,
|
|
}
|
|
}
|
|
inline for (structInfo.fields) |field, i| {
|
|
if (!fields_seen[i]) {
|
|
if (field.default_value) |default_ptr| {
|
|
if (!field.is_comptime) {
|
|
const default = @ptrCast(*align(1) const field.field_type, default_ptr).*;
|
|
@field(r, field.name) = default;
|
|
}
|
|
} else {
|
|
return error.MissingField;
|
|
}
|
|
}
|
|
}
|
|
return r;
|
|
},
|
|
.Array => |arrayInfo| {
|
|
switch (token) {
|
|
.ArrayBegin => {
|
|
var r: T = undefined;
|
|
var i: usize = 0;
|
|
var child_options = options;
|
|
child_options.allow_trailing_data = true;
|
|
errdefer {
|
|
// Without the r.len check `r[i]` is not allowed
|
|
if (r.len > 0) while (true) : (i -= 1) {
|
|
parseFreeInternal(arrayInfo.child, r[i], options);
|
|
if (i == 0) break;
|
|
};
|
|
}
|
|
while (i < r.len) : (i += 1) {
|
|
const next_token = (try tokens.next()) orelse return error.UnexpectedEndOfJson;
|
|
r[i] = try parseInternal(arrayInfo.child, next_token, tokens, child_options);
|
|
}
|
|
const tok = (try tokens.next()) orelse return error.UnexpectedEndOfJson;
|
|
switch (tok) {
|
|
.ArrayEnd => {},
|
|
else => return error.UnexpectedToken,
|
|
}
|
|
return r;
|
|
},
|
|
.String => |stringToken| {
|
|
if (arrayInfo.child != u8) return error.UnexpectedToken;
|
|
var r: T = undefined;
|
|
const source_slice = stringToken.slice(tokens.slice, tokens.i - 1);
|
|
switch (stringToken.escapes) {
|
|
.None => mem.copy(u8, &r, source_slice),
|
|
.Some => try unescapeValidString(&r, source_slice),
|
|
}
|
|
return r;
|
|
},
|
|
else => return error.UnexpectedToken,
|
|
}
|
|
},
|
|
.Pointer => |ptrInfo| {
|
|
const allocator = options.allocator orelse return error.AllocatorRequired;
|
|
switch (ptrInfo.size) {
|
|
.One => {
|
|
const r: T = try allocator.create(ptrInfo.child);
|
|
errdefer allocator.destroy(r);
|
|
r.* = try parseInternal(ptrInfo.child, token, tokens, options);
|
|
return r;
|
|
},
|
|
.Slice => {
|
|
switch (token) {
|
|
.ArrayBegin => {
|
|
var arraylist = std.ArrayList(ptrInfo.child).init(allocator);
|
|
errdefer {
|
|
while (arraylist.popOrNull()) |v| {
|
|
parseFreeInternal(ptrInfo.child, v, options);
|
|
}
|
|
arraylist.deinit();
|
|
}
|
|
|
|
while (true) {
|
|
const tok = (try tokens.next()) orelse return error.UnexpectedEndOfJson;
|
|
switch (tok) {
|
|
.ArrayEnd => break,
|
|
else => {},
|
|
}
|
|
|
|
try arraylist.ensureUnusedCapacity(1);
|
|
const v = try parseInternal(ptrInfo.child, tok, tokens, options);
|
|
arraylist.appendAssumeCapacity(v);
|
|
}
|
|
|
|
if (ptrInfo.sentinel) |some| {
|
|
const sentinel_value = @ptrCast(*const ptrInfo.child, some).*;
|
|
try arraylist.append(sentinel_value);
|
|
const output = arraylist.toOwnedSlice();
|
|
return output[0 .. output.len - 1 :sentinel_value];
|
|
}
|
|
|
|
return arraylist.toOwnedSlice();
|
|
},
|
|
.String => |stringToken| {
|
|
if (ptrInfo.child != u8) return error.UnexpectedToken;
|
|
const source_slice = stringToken.slice(tokens.slice, tokens.i - 1);
|
|
const len = stringToken.decodedLength();
|
|
const output = try allocator.alloc(u8, len + @boolToInt(ptrInfo.sentinel != null));
|
|
errdefer allocator.free(output);
|
|
switch (stringToken.escapes) {
|
|
.None => mem.copy(u8, output, source_slice),
|
|
.Some => try unescapeValidString(output, source_slice),
|
|
}
|
|
|
|
if (ptrInfo.sentinel) |some| {
|
|
const char = @ptrCast(*const u8, some).*;
|
|
output[len] = char;
|
|
return output[0..len :char];
|
|
}
|
|
|
|
return output;
|
|
},
|
|
else => return error.UnexpectedToken,
|
|
}
|
|
},
|
|
else => @compileError("Unable to parse into type '" ++ @typeName(T) ++ "'"),
|
|
}
|
|
},
|
|
else => @compileError("Unable to parse into type '" ++ @typeName(T) ++ "'"),
|
|
}
|
|
unreachable;
|
|
}
|
|
|
|
fn ParseError(comptime T: type) type {
|
|
return ParseInternalError(T) || error{UnexpectedEndOfJson} || TokenStream.Error;
|
|
}
|
|
|
|
/// Releases resources created by `parse`.
|
|
/// Should be called with the same type and `ParseOptions` that were passed to `parse`
|
|
fn parseFreeInternal(comptime T: type, value: T, options: ParseOptions) void {
|
|
switch (@typeInfo(T)) {
|
|
.Bool, .Float, .ComptimeFloat, .Int, .ComptimeInt, .Enum => {},
|
|
.Optional => {
|
|
if (value) |v| {
|
|
return parseFreeInternal(@TypeOf(v), v, options);
|
|
}
|
|
},
|
|
.Union => |unionInfo| {
|
|
if (unionInfo.tag_type) |UnionTagType| {
|
|
inline for (unionInfo.fields) |u_field| {
|
|
if (value == @field(UnionTagType, u_field.name)) {
|
|
parseFreeInternal(u_field.field_type, @field(value, u_field.name), options);
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
unreachable;
|
|
}
|
|
},
|
|
.Struct => |structInfo| {
|
|
inline for (structInfo.fields) |field| {
|
|
if (!field.is_comptime) {
|
|
parseFreeInternal(field.field_type, @field(value, field.name), options);
|
|
}
|
|
}
|
|
},
|
|
.Array => |arrayInfo| {
|
|
for (value) |v| {
|
|
parseFreeInternal(arrayInfo.child, v, options);
|
|
}
|
|
},
|
|
.Pointer => |ptrInfo| {
|
|
const allocator = options.allocator orelse unreachable;
|
|
switch (ptrInfo.size) {
|
|
.One => {
|
|
parseFreeInternal(ptrInfo.child, value.*, options);
|
|
allocator.destroy(value);
|
|
},
|
|
.Slice => {
|
|
for (value) |v| {
|
|
parseFreeInternal(ptrInfo.child, v, options);
|
|
}
|
|
allocator.free(value);
|
|
},
|
|
else => unreachable,
|
|
}
|
|
},
|
|
else => unreachable,
|
|
}
|
|
}
|