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https://github.com/nicklockwood/SwiftFormat.git
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Cal Stephens
77 lines
2.3 KiB
Swift
77 lines
2.3 KiB
Swift
//
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// json.swift
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// JSON
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//
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// Created by Nick Lockwood on 12/03/2018.
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// Copyright © 2018 Nick Lockwood. All rights reserved.
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//
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/// JSON parser
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public func parseJSON(_ input: String) throws -> Any {
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let match = try json.match(input)
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return try match.transform(jsonTransform)!
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}
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/// JSON compiler
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public func compileJSONParser() -> String {
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return json.compile("parseJSON3", transformFunction: "jsonTransform")
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}
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/// JSON grammar
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private let space: Consumer<JSONLabel> = .discard(.zeroOrMore(.character(in: " \t\n\r")))
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private let null: Consumer<JSONLabel> = .label(.null, "null")
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private let boolean: Consumer<JSONLabel> = .label(.boolean, "true" | "false")
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private let digit: Consumer<JSONLabel> = .character(in: "0" ... "9")
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private let number: Consumer<JSONLabel> = .label(.number, .flatten([
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.optional("-"),
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.any(["0", [.character(in: "1" ... "9"), .zeroOrMore(digit)]]),
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.optional([".", .oneOrMore(digit)]),
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.optional([
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.character(in: "eE"),
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.optional(.character(in: "+-")),
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.oneOrMore(digit),
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]),
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]))
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private let hexdigit: Consumer<JSONLabel> = digit | .character(in: "a" ... "f") | .character(in: "A" ... "F")
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private let string: Consumer<JSONLabel> = .label(.string, [
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.discard("\""),
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.zeroOrMore(.any([
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.flatten(.oneOrMore(.anyCharacter(except: "\"", "\\"))),
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[.discard("\\"), .any([
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"\"", "\\", "/",
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.replace("b", "\u{8}"),
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.replace("f", "\u{C}"),
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.replace("n", "\n"),
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.replace("r", "\r"),
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.replace("t", "\t"),
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.label(.unichar, .flatten([
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.discard("u"), hexdigit, hexdigit, hexdigit, hexdigit,
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])),
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])],
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])),
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.discard("\""),
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])
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private let array: Consumer<JSONLabel> = .label(.array, [
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.discard("["),
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.optional(.interleaved(
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.reference(.json),
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.discard(",")
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)),
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.discard("]"),
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])
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private let object: Consumer<JSONLabel> = .label(.object, [
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.discard("{"),
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.optional(.interleaved(
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.label(.keyValue, [
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space, string, space,
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.discard(":"),
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.reference(.json),
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]),
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.discard(",")
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)),
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.discard("}"),
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])
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private let json: Consumer<JSONLabel> = .label(.json, [
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space, boolean | null | number | string | object | array, space,
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])
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