From 70d3ef508e10d458b89bf1eaac7238fa61376112 Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Fri, 8 Oct 2021 16:11:39 +0200
Subject: Add support for strings

---
 src/bootstrap/main.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 71 insertions(+), 6 deletions(-)

diff --git a/src/bootstrap/main.c b/src/bootstrap/main.c
index fad3333..241697a 100755
--- a/src/bootstrap/main.c
+++ b/src/bootstrap/main.c
@@ -5,6 +5,10 @@
 
 #include "shorthand.h"
 
+
+// FIXME: We are not worried right now about freeing memory, but we should in
+// the future.
+
 typedef struct StringView {
     char *start;
     size_t n;
@@ -93,8 +97,44 @@ tokenize(StringView sv) {
                 }
                 continue;
             } break;
+            case '"': {
+                if (token_n != 0) {
+                    fprintf(stderr, "error: string started inside symbol\n");
+                    return (Tokens){0};
+                }
+
+                // Find end delimiter.
+                size_t string_start = i + 1;
+                size_t string_end = i + 1;
+                while (true) {
+                    if (sv.start[string_end] == '"' && sv.start[string_end - 1] != '\\') {
+                        break;
+                    }
+                    if (string_end >= sv.n) {
+                        fprintf(stderr, "error: string delimiter not found\n");
+                        return (Tokens){0};
+                    }
+                    string_end++;
+                }
+
+                // Push string token.
+                tokens_buf[n++] = (StringView){
+                    .start = &sv.start[string_start - 1],
+                    .n = 1,
+                };
+                tokens_buf[n++] = (StringView){
+                    .start = &sv.start[string_start],
+                    .n = string_end - string_start,
+                };
+                tokens_buf[n++] = (StringView){
+                    .start = &sv.start[string_end],
+                    .n = 1,
+                };
+                token_n = 0;
+                i += string_end - string_start + 1;
+            } break;
             case '(': {
-                if ((i + 1 < sv.n)) {
+                if ((i + 1) < sv.n) {
                     char next_c = sv.start[i + 1];
                     if (isspace(next_c)) {
                         fprintf(stderr, "error: lparen delimiter followed by space\n");
@@ -113,7 +153,7 @@ tokenize(StringView sv) {
                 };
             } break;
             case ')': {
-                if ((i + 1 < sv.n)) {
+                if ((i + 1) < sv.n) {
                     char next_c = sv.start[i + 1];
                     if ((next_c != ')' && !isspace(next_c))) {
                         fprintf(stderr, "error: rparen delimiter within symbol name\n");
@@ -227,15 +267,28 @@ make_boolean(bool b) {
 }
 
 Object *
-make_string(const char *str, size_t n) {
+make_empty_string(void) {
     Object *obj = malloc(sizeof(Object));
     obj->type = OBJ_TYPE_STRING;
-    obj->string = malloc(sizeof(char) * n);
-    memcpy(obj->string, str, n);
-    obj->string_n = n;
+    obj->string = NULL;
+    obj->string_n = 0;
     return obj;
 }
 
+void
+append_string(Object *string, StringView sv) {
+    assert(string != NULL);
+    assert(string->type == OBJ_TYPE_STRING);
+
+    if (sv.n == 0) {
+        return;
+    }
+
+    string->string = realloc(string->string, (string->string_n + sv.n) * sizeof(char));
+    memcpy(string->string + string->string_n, sv.start, sv.n);
+    string->string_n += sv.n;
+}
+
 Object *
 make_symbol(const char *str, size_t n) {
     Object *obj = malloc(sizeof(Object));
@@ -302,6 +355,9 @@ build_ast(Tokens *tokens) {
     // TODO: Report error if we haven't consumed all the tokens?
     while (tokens->n > 0) {
         StringView *token = consume_token(tokens);
+        if (token == NULL) {
+            return NULL;
+        }
 
         // OBJ_TYPE_FIXNUM
         if (token_is_fixnum(*token)) {
@@ -344,6 +400,15 @@ build_ast(Tokens *tokens) {
             return list;
         }
 
+        // OBJ_TYPE_STRING
+        if (token->start[0] == '"') {
+            Object *obj = make_empty_string();
+            token = consume_token(tokens);
+            append_string(obj, *token);
+            consume_token(tokens);
+            return obj;
+        }
+
         // OBJ_TYPE_SYMBOL
         return make_symbol(token->start, token->n);
     }
-- 
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