From f5c4671bfbad96bf346bd7e9a21fc4317b4959df Mon Sep 17 00:00:00 2001
From: Indrajith K L
Date: Sat, 3 Dec 2022 17:00:20 +0530
Subject: Adds most of the tools

---
 v_windows/v/old/vlib/x/json2/decoder.v | 200 +++++++++++++++++++++++++++++++++
 1 file changed, 200 insertions(+)
 create mode 100644 v_windows/v/old/vlib/x/json2/decoder.v

(limited to 'v_windows/v/old/vlib/x/json2/decoder.v')

diff --git a/v_windows/v/old/vlib/x/json2/decoder.v b/v_windows/v/old/vlib/x/json2/decoder.v
new file mode 100644
index 0000000..a45a091
--- /dev/null
+++ b/v_windows/v/old/vlib/x/json2/decoder.v
@@ -0,0 +1,200 @@
+// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+module json2
+
+// `Any` is a sum type that lists the possible types to be decoded and used.
+pub type Any = Null | []Any | bool | f32 | f64 | i64 | int | map[string]Any | string |
+	u64
+
+// `Null` struct is a simple representation of the `null` value in JSON.
+pub struct Null {
+	is_null bool = true
+}
+
+struct Parser {
+mut:
+	scanner      &Scanner
+	p_tok        Token
+	tok          Token
+	n_tok        Token
+	n_level      int
+	convert_type bool = true
+}
+
+struct InvalidTokenError {
+	msg  string
+	code int
+}
+
+struct UnknownTokenError {
+	msg  string
+	code int
+}
+
+fn (mut p Parser) next() {
+	p.p_tok = p.tok
+	p.tok = p.n_tok
+	p.n_tok = p.scanner.scan()
+}
+
+fn (mut p Parser) next_with_err() ? {
+	p.next()
+	if p.tok.kind == .error {
+		return error(p.emit_error(p.tok.lit.bytestr()))
+	}
+}
+
+fn (p Parser) emit_error(msg string) string {
+	line := p.tok.line
+	column := p.tok.col + p.tok.lit.len
+	return '[x.json2] $msg ($line:$column)'
+}
+
+// TODO: copied from v.util to avoid the entire module and its functions
+// from being imported. remove later once -skip-unused is enabled by default.
+fn skip_bom(file_content string) string {
+	mut raw_text := file_content
+	// BOM check
+	if raw_text.len >= 3 {
+		unsafe {
+			c_text := raw_text.str
+			if c_text[0] == 0xEF && c_text[1] == 0xBB && c_text[2] == 0xBF {
+				// skip three BOM bytes
+				offset_from_begin := 3
+				raw_text = tos(c_text[offset_from_begin], vstrlen(c_text) - offset_from_begin)
+			}
+		}
+	}
+	return raw_text
+}
+
+fn new_parser(srce string, convert_type bool) Parser {
+	src := skip_bom(srce)
+	return Parser{
+		scanner: &Scanner{
+			text: src.bytes()
+		}
+		convert_type: convert_type
+	}
+}
+
+fn (mut p Parser) decode() ?Any {
+	p.next()
+	p.next_with_err() ?
+	fi := p.decode_value() ?
+	if p.tok.kind != .eof {
+		return IError(&InvalidTokenError{
+			msg: p.emit_error('invalid token `$p.tok.kind`')
+		})
+	}
+	return fi
+}
+
+fn (mut p Parser) decode_value() ?Any {
+	if p.n_level + 1 == 500 {
+		return error(p.emit_error('reached maximum nesting level of 500'))
+	}
+	match p.tok.kind {
+		.lsbr {
+			return p.decode_array()
+		}
+		.lcbr {
+			return p.decode_object()
+		}
+		.int_, .float {
+			tl := p.tok.lit.bytestr()
+			kind := p.tok.kind
+			p.next_with_err() ?
+			if p.convert_type {
+				if kind == .float {
+					return Any(tl.f64())
+				}
+				return Any(tl.i64())
+			}
+			return Any(tl)
+		}
+		.bool_ {
+			lit := p.tok.lit.bytestr()
+			p.next_with_err() ?
+			if p.convert_type {
+				return Any(lit.bool())
+			}
+			return Any(lit)
+		}
+		.null {
+			p.next_with_err() ?
+			if p.convert_type {
+				return Any(null)
+			}
+			return Any('null')
+		}
+		.str_ {
+			str := p.tok.lit.bytestr()
+			p.next_with_err() ?
+			return Any(str)
+		}
+		else {
+			return IError(&InvalidTokenError{
+				msg: p.emit_error('invalid token `$p.tok.kind`')
+			})
+		}
+	}
+	return Any(null)
+}
+
+fn (mut p Parser) decode_array() ?Any {
+	mut items := []Any{}
+	p.next_with_err() ?
+	p.n_level++
+	for p.tok.kind != .rsbr {
+		item := p.decode_value() ?
+		items << item
+		if p.tok.kind == .comma {
+			p.next_with_err() ?
+			if p.tok.kind == .rsbr || p.tok.kind == .rcbr {
+				return IError(&InvalidTokenError{
+					msg: p.emit_error('invalid token `$p.tok.lit')
+				})
+			}
+		} else if p.tok.kind == .rsbr {
+			break
+		} else {
+			return IError(&UnknownTokenError{
+				msg: p.emit_error("unknown token '$p.tok.lit' when decoding array.")
+			})
+		}
+	}
+	p.next_with_err() ?
+	p.n_level--
+	return Any(items)
+}
+
+fn (mut p Parser) decode_object() ?Any {
+	mut fields := map[string]Any{}
+	p.next_with_err() ?
+	p.n_level++
+	for p.tok.kind != .rcbr {
+		is_key := p.tok.kind == .str_ && p.n_tok.kind == .colon
+		if !is_key {
+			return IError(&InvalidTokenError{
+				msg: p.emit_error('invalid token `$p.tok.kind`, expecting `str_`')
+			})
+		}
+		cur_key := p.tok.lit.bytestr()
+		p.next_with_err() ?
+		p.next_with_err() ?
+		fields[cur_key] = p.decode_value() ?
+		if p.tok.kind == .comma {
+			p.next_with_err() ?
+			if p.tok.kind != .str_ {
+				return IError(&UnknownTokenError{
+					msg: p.emit_error("unknown token '$p.tok.lit' when decoding object.")
+				})
+			}
+		}
+	}
+	p.next_with_err() ?
+	p.n_level--
+	return Any(fields)
+}
-- 
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