From e8897609b736af440de101fa851b798c8092f19a Mon Sep 17 00:00:00 2001
From: Felix Van der Jeugt <felix.vanderjeugt@posteo.net>
Date: Thu, 3 Nov 2022 08:23:02 +0100
Subject: [PATCH] add json parsing of booleans and numbers

---
 json.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 61 insertions(+), 7 deletions(-)

diff --git a/json.c b/json.c
index 92ad903..7feb50b 100644
--- a/json.c
+++ b/json.c
@@ -6,9 +6,63 @@
 #include "sortedmap.h"
 #include "arraylist.h"
 
-/* TODO */
-Json * parse_map(FILE *stream) { return NULL; /* TODO */ }
-Json * parse_list(FILE *stream) { return NULL; /* TODO */ }
+Json * parse_true(FILE *stream) {
+	Json * json;
+	if (getc(stream) == 'r' && getc(stream) == 'u' && getc(stream) == 'e') {
+		json = malloc(sizeof(Json));
+		json->type = BOOLEAN;
+		json->value.boolean = 1;
+		return json;
+	}
+	return NULL;
+}
+
+Json * parse_false(FILE *stream) {
+	Json * json;
+	if (getc(stream) == 'a' && getc(stream) == 'l' && getc(stream) == 's' && getc(stream) == 'e') {
+		json = malloc(sizeof(Json));
+		json->type = BOOLEAN;
+		json->value.boolean = 0;
+		return json;
+	}
+	return NULL;
+}
+
+Json * parse_number(FILE *stream) {
+	Json * json;
+	long num = 0, den = 0;
+	char c;
+	while (1) {
+		c = getc(stream);
+		switch(c) {
+		case '0':
+			num = num * 10;
+			den *= 10;
+			break;
+		case '1':
+		case '2':
+		case '3':
+		case '4':
+		case '5':
+		case '6':
+		case '7':
+		case '8':
+		case '9':
+			num = num * 10 + (c - '1' + 1);
+			den *= 10;
+			break;
+		case '.':
+			den = 1;
+			break;
+		default:
+			if (c != EOF) ungetc(c, stream);
+			json = malloc(sizeof(Json));
+			json->type = NUMBER;
+			json->value.number = num * 1.0 / den;
+			return json;
+		}
+	}
+}
 
 Json * parse_string(FILE *stream) {
 	int i = 0, cap = 10;
@@ -42,9 +96,8 @@ Json * parse_string(FILE *stream) {
 	return NULL;
 }
 
-Json * parse_true(FILE *stream) { return NULL; /* TODO */ }
-Json * parse_false(FILE *stream) { return NULL; /* TODO */ }
-Json * parse_number(FILE *stream, char first) { return NULL; /* TODO */ }
+Json * parse_list(FILE *stream) { return NULL; /* TODO */ }
+Json * parse_map(FILE *stream) { return NULL; /* TODO */ }
 
 Json * json_parse(FILE *stream) {
 	char c;
@@ -71,7 +124,8 @@ Json * json_parse(FILE *stream) {
 		case '7':
 		case '8':
 		case '9':
-			return parse_number(stream, c);
+			ungetc(c, stream);
+			return parse_number(stream);
 		case ' ':
 		case '\n':
 		case '\t':