some progress

some progress

cig.h

@@ -317,7 +317,7 @@ scan_result_t scan_value_func(scan_value_t value);
 
 scan_result_t scan_error_and_recover(scanner_t *s, char const *message);
 bool scan_eof(scanner_t *s);
-bool scan_literal(scanner_t *s, char const *lit);
+scan_result_t scan_literal(scanner_t *s, char const *lit);
 int scan_repeat_literal(scanner_t *s, char const *lit);
 bool scan_whitespace(scanner_t *s);
 scan_result_t scan_digit(scanner_t *s);
@@ -389,14 +389,7 @@ typedef struct json_pair {
 	json_value_t value;
 } json_pair_t;
 
-bool json_as_array(json_value_t *value, json_array_t *array);
+bool json_parse(scanner_t *scanner, allocator_t allocator, json_value_t *out);
-bool json_as_boolean(json_value_t *value, bool *out_bool);
-bool json_as_null(json_value_t *value);
-bool json_as_number(json_value_t *value, double *out_double);
-bool json_as_object(json_value_t *value, json_object_t *out_object);
-bool json_as_string(json_value_t *value, json_string_t *out_string);
-bool json_obj_get(json_object_t *obj, json_string_t key, json_value_t *out_value);
-json_value_t json_parse(scanner_t *scanner, allocator_t allocator);
 
 // string builder //////////////////////////////////////////////////////////////
 typedef struct string_builder_node {

json.c

@@ -1,66 +1,106 @@
 #include "cig.h"
 #include <string.h>
 
-bool json_as_array(json_value_t *value, json_array_t *array) {
+bool json_parse(scanner_t *scanner, allocator_t allocator, json_value_t *out) {
-}
-
-bool json_as_boolean(json_value_t *value, bool *out_bool) {
-}
-
-bool json_as_null(json_value_t *value) {
-}
-
-bool json_as_number(json_value_t *value, double *out_double) {
-}
-
-bool json_as_object(json_value_t *value, json_object_t *out_object) {
-}
-
-bool json_as_string(json_value_t *value, json_string_t *out_string) {
-}
-
-bool json_obj_get(json_object_t *obj, json_string_t key, json_value_t *out_value) {
-}
-
-json_value_t json_parse(scanner_t *scanner, allocator_t allocator) {
 	scan_whitespace(scanner);
-	if (scan_string_literal(scanner)) {
+
-		const char *buffer = scanner->value.string_literal;
+	scan_result_t str_result = scan_string_literal(scanner);
+	if (str_result.ok) {
+		const char *buffer = str_result.value.string_literal;
 		size_t length = strlen(buffer);
 		char *buff_copy = allocator_alloc(allocator, length+1);
 		strncpy(buff_copy, buffer, length+1);
 		buff_copy[length] = '\0';
-		return (json_value_t) {
+		*out = (json_value_t) {
 			.type=json_type_string,
 			.string=(json_string_t) { .length=length, .buffer=buff_copy }
 		};
-	} else if (scan_f64(scanner)) {
+		return true;
-		return (json_value_t) {
+	}
+
+	scan_result_t f64_result = scan_f64(scanner);
+	if (f64_result.ok) {
+		*out = (json_value_t) {
 			.type=json_type_number,
-			.number=scanner->value.f64
+			.number=f64_result.value.f64
 		};
-	} else if (scan_i64(scanner)) {
+		return true;
-		// TODO: is this needed?
+	}
-		return (json_value_t) {
+
+	scan_result_t i64_result = scan_i64(scanner);
+	if (i64_result.ok) {
+		*out = (json_value_t) {
 			.type=json_type_number,
-			.number=(double)scanner->value.i64
+			.number=(double)i64_result.value.i64
 		};
-	} else if (scan_literal(scanner, "true")) {
+		return true;
-		return (json_value_t) {
+	}
+	
+	scan_result_t true_result = scan_literal(scanner, "true");
+	if (true_result.ok) {
+		*out = (json_value_t) {
 			.type=json_type_boolean,
 			.boolean=true
 		};
-	} else if (scan_literal(scanner, "false")) {
+		return true;
-		return (json_value_t) {
+	}
+	
+	scan_result_t false_result = scan_literal(scanner, "false");
+	if (false_result.ok) {
+		*out = (json_value_t) {
 			.type=json_type_boolean,
 			.boolean=false
 		};
-	} else if (scan_literal(scanner, "null")) {
+		return true;
-		return (json_value_t) {
-			.type=json_type_null
-		};
-	} else if (scan_literal(scanner, "[")) {
-		json_parse(scanner, allocator);
-		// TODO
 	}
+
+	scan_result_t null_result = scan_literal(scanner, "null");
+	if (null_result.ok) {
+		*out = (json_value_t) { .type=json_type_null, };
+		return true;
+	}
+
+	scan_result_t arr_open_result = scan_literal(scanner, "[");
+	if (arr_open_result.ok) {
+		json_value_t *values = make_arr(json_value_t, allocator);
+		do {
+			scan_whitespace(scanner);
+			json_value_t val;
+			bool ok = json_parse(scanner, allocator, &val);
+			if (!ok) {
+				return false;
+			}
+			arr_append(values, val);
+			scan_whitespace(scanner);
+		} while(scan_literal(scanner, ",").ok);
+
+		*out = (json_value_t) {
+			.type=json_type_array,
+			.array=(json_array_t){
+				.values=values,
+				.length=arr_len(values),
+			},
+		};
+
+		scan_result_t arr_close_result = scan_literal(scanner, "]");
+		return arr_close_result.ok;
+	}
+
+	// TODO: arrays and objects are allowed to contain nothing...
+
+	scan_result_t obj_open_result = scan_literal(scanner, "{");
+	if (obj_open_result.ok) {
+		json_pair_t *pairs = make_arr(json_pair_t, allocator);
+		// TODO: continue here
+		do {
+			scan_whitespace(scanner);
+			scan_result_t key_result = scan_string_literal(scanner);
+		} while(scan_literal(scanner, ",").ok);
+	}
+
+typedef struct json_pair {
+	json_string_t key;
+	json_value_t value;
+} json_pair_t;
+
 }

scanner.c

@@ -60,22 +60,22 @@ bool scan_eof(scanner_t *s) {
 	return *s->cur == '\0';
 }
 
-bool scan_literal(scanner_t *s, char const *lit) {
+scan_result_t scan_literal(scanner_t *s, char const *lit) {
 	char const *save = s->cur;
 	while (*lit && *lit == *s->cur) {
 		lit++;
 		s->cur++;
 	}
 	if (*lit == '\0') {
-		return true;
+		return (scan_result_t) { .ok = true };
 	}
 	s->cur = save;
-	return false;
+	return scan_error(s, "literal not present");
 }
 
 int scan_repeat_literal(scanner_t *s, char const *lit) {
 	int n_repeats = 0;
-	while (scan_literal(s, lit)) {
+	while (scan_literal(s, lit).ok) {
 		n_repeats++;
 	}
 	return n_repeats;

test_scanner.c

@@ -26,9 +26,9 @@ Test(scanner, looks_like_float) {
 			bool does_look_like_int = looks_like_int(&scanner);
 			while (*scanner.cur++ != ' ');
 			bool expect;
-			if (scan_literal(&scanner, "true")) {
+			if (scan_literal(&scanner, "true").ok) {
 				expect = true;
-			} else if (scan_literal(&scanner, "false")) {
+			} else if (scan_literal(&scanner, "false").ok) {
 				expect = false;
 			} else {
 				assert(false && "invalid expectation");