Fix EvalCommandsLineByLine wholly failing on any error, redesign :Set

src/basic/basic_string.cpp

@@ -339,6 +339,22 @@ API Array<String> Split(Allocator allocator, String string, String delimiter) {
     return result;
 }
 
+API Array<String> SplitWhitespace(Allocator allocator, String string) {
+    Array<String> result = {allocator};
+    String it = {string.data, 0};
+    for (int64_t i = 0; i < string.len; i += 1) {
+        if (IsWhitespace(string[i])) {
+            if (it.len) Add(&result, it);
+            it.len = 0;
+            it.data = string.data + (i + 1);
+        } else {
+            it.len += 1;
+        }
+    }
+    if (it.len) Add(&result, it);
+    return result;
+}
+
 API String Merge(Allocator allocator, Array<String> list, String separator) {
     int64_t char_count = 0;
     For(list) char_count += it.len;
@@ -441,3 +457,58 @@ API Int ChopNumber(String *string) {
     Int result = strtoll(col.data, NULL, 10) - 1;
     return result;
 }
+
+String SkipIdent(String *string) {
+    String begin = {string->data, 0};
+    if (IsIdent(At(*string, 0))) {
+        for (;string->len;) {
+            char c = At(*string, 0);
+            if (!IsIdent(c) && !IsDigit(c)) {
+                break;
+            }
+            *string = Skip(*string, 1);
+            begin.len += 1;
+        }
+    }
+    return begin;
+}
+
+String SkipString(String *string) {
+    String saved_string = *string;
+    char c = At(*string, 0);
+    String q = {&c, 1};
+    if (c == '"' || c == '\'') {
+        *string = Skip(*string, 1);
+        String quote = SkipUntil(string, q);
+        if (At(*string, 0) != c) {
+            *string = saved_string;
+            return {};
+        }
+        return quote;
+    }
+    return {};
+}
+
+API String SkipFloatEx(String *string) {
+    String col = {string->data, 0};
+    if (At(*string, 0) == '-') {
+        col.len += 1;
+        *string = Skip(*string, 1);
+    }
+    for (int64_t i = 0; i < string->len; i += 1) {
+        if (IsDigit(string->data[i]) || string->data[i] == u'.') {
+            col.len += 1;
+        } else {
+            break;
+        }
+    }
+    *string = Skip(*string, col.len);
+    return col;
+}
+
+API Float SkipFloat(String *string) {
+    String col = SkipFloatEx(string);
+    if (col.len == 0) return 0;
+    Float result = strtod(string->data, NULL);
+    return result;
+}