Basic query construction done.

src/queries.js

@@ -24,54 +24,118 @@ export const MatchTypeEnum = {
     MATCH_LIKE: 2,
 };
 
-export const ResultFilterTypeEnum = {
-    MATCH_NAME: 1,
+export const MatchAgainstEnum = {
+    MATCH_RESULT_NAME: 1, // Match on the name of whatever object type we are querying for
+    MATCH_IMAGE_NAME: 2, // Match on the name of the relevant image, if any
+    MATCH_ALBUM_NAME: 3, // Match on the name of the relevant album, if any
 }
 
 export const ResultTypeEnum = {
     IMAGE: 1,
+    ALBUM: 2,
 }
 
 export class ResultFilter {
+    constructor(type) { this.result_type = type; }
+
+    result_type = ResultTypeEnum.IMAGE;
+
+    to_sql_where() { return "(1=1)"; }
+}
+
+export class ConstFilter extends ResultFilter {
+    constructor(type, val) { super(type); this.constval = val; }
+    constval = true; // True lets everything through, false rejects everything
+
+    to_sql_where() {
+        return this.constval ? "(1=1)" : "(1=0)";
+    }
+}
+
+function match_column_name(result_type, match_against) {
+    if(match_against == MatchAgainstEnum.MATCH_IMAGE_NAME) {
+        return "Image.name";
+    }
+    if(match_against == MatchAgainstEnum.MATCH_ALBUM_NAME) {
+        return "Album.name";
+    }
+    if(match_against == MatchAgainstEnum.MATCH_RESULT_NAME) {
+        if(result_type == ResultTypeEnum.IMAGE) {
+            return match_column_name(result_type, MatchAgainstEnum.MATCH_IMAGE_NAME);
+        }
+        if(result_type == ResultTypeEnum.ALBUM) {
+            return match_column_name(result_type, MatchAgainstEnum.MATCH_ALBUM_NAME);
+        }
+    }
+    throw new Error("Could not get column name for matching properties passed.");
+}
+
+export class MatchingFilter extends ResultFilter {
+    constructor(rtype, against, from, mtype, negate) {
+        super(rtype);
+        this.match_against = against;
+        this.match_from = from;
+        this.match_type = mtype;
+        this.negate = negate;
+    }
+
     // What kind of filtering to apply
-    type = ResultFilterTypeEnum.MATCH_NAME;
+    match_against = MatchAgainstEnum.MATCH_RESULT_NAME;
 
     // optional string used in the filtering
-    match_against = "";
+    match_from = "";
 
     // How to use the matching string
     match_type = MatchTypeEnum.MATCH_EQUALS;
 
-    // On which types of results to apply the filter
-    result_types = [];
-
     // If true, negates the filter
     negate = false;
-}
 
-export class UserQuery {
-    result_filters = [];
-    include_result_types = [ ResultTypeEnum.IMAGE ];
+    to_sql_where() {
+        var match_against_str = match_column_name(this.result_type, this.match_against);
+        var match_type_str = false;
+    
+        if(this.match_type == MatchTypeEnum.MATCH_EQUALS) {
+            match_type_str = "=";
+        } else if(this.match_type == MatchTypeEnum.MATCH_LIKE) {
+            match_type_str = " LIKE ";
+        } else {
+            throw new Error('Unsupported match type: ' + this.match_type);
+        }
+    
+        return "(" + (this.negate ? "NOT " : "") + match_against_str + "\"" + match_type_str + "\"" + this.match_from + ")";
+    }
 }
 
-export function image_filter_to_where(image_filter) {
-    var match_from = false;
-    var match_to = image_filter.match_against;
-    var match_operator = false;
+export const LogicalOperatorEnum = {
+    AND: 1,
+    OR: 2,
+}
 
-    if(image_filter.type == ResultFilterTypeEnum.MATCH_NAME) {
-        match_from = "Image.name";
+export class LogicalOperatorFilter extends ResultFilter {
+    constructor(type, a, b, op) { super(type); this.sub_filter_a = a; this.sub_filter_b = b; this.operator = op; }
+    sub_filter_a = false;
+    sub_filter_b = false;
+    operator = LogicalOperatorEnum.AND;
+
+    to_sql_where() {
+        var where1 = this.sub_filter_a.to_sql_where();
+        var where2 = this.sub_filter_b.to_sql_where();
+        var operator_str = "";
+        if(this.operator == LogicalOperatorEnum.AND) {
+            operator_str = " AND ";
+        } else if(this.operator == LogicalOperatorEnum.OR) {
+            operator_str = " OR ";
         } else {
-        throw new Error("Unsupported image filter type: " + image_filter.type);
+            throw new Error('Unsupported logical operator: ' + this.operator);
         }
-
-    if(image_filter.match_type == MatchTypeEnum.MATCH_EQUALS) {
-        match_operator = "=";
-    } else if(image_filter.match_type == MatchTypeEnum.MATCH_LIKE) {
-        match_operator = " LIKE ";
+        return "(" + where1 + operator_str + where2 + ")";
     }
+}
 
-    return match_from + match_operator + match_to;
+export class UserQuery {
+    image_filter = new ConstFilter(ResultTypeEnum.IMAGE, true);
+    album_filter = new ConstFilter(ResultTypeEnum.ALBUM, true);
 }
 
 // This query will return database entries with the fields "id", "uniqueHash", "relativePath" (of the album) and "name" for each matching image.
@@ -80,32 +144,16 @@ export function image_query_with_where(maybe_where) {
 }
 
 export function maybe_image_query(user_query) {
-    if(!user_query.include_result_types.includes(ResultTypeEnum.IMAGE)) {
-        return false;
-    }
     var where = false;
-    if(user_query.image_filters.length) {
-        where = "WHERE ";
-        var i = 0;
-        user_query.image_filters.forEach(elem => {
-            if(i > 0) {
-                where += "AND";
-            }
-            where += image_filter_to_where(elem) + " ";
-            i++;
-        });
+    if(user_query.image_filter) {
+        where = "WHERE " + user_query.image_filter.to_sql_where();
     }
-
     return image_query_with_where(where);
 }
 
-function filter_from_text_segment(segment) {
-    var r = new ResultFilter();
-    r.match_against = segment['text'];
-    r.negate = segment['negated'];
-    r.match_type = MatchTypeEnum.MATCH_EQUALS;
-    r.type = ResultFilterTypeEnum.MATCH_NAME;
-    return r;
+function filter_from_text_segment(result_type, segment) {
+    return new MatchingFilter(result_type, MatchAgainstEnum.MATCH_RESULT_NAME,
+        segment['text'], MatchTypeEnum.MATCH_EQUALS, segment['negated']);
 }
 
 export function user_query_from_search_string(search_string) {
@@ -118,9 +166,14 @@ export function user_query_from_search_string(search_string) {
     var r = new UserQuery();
 
     texts.forEach(text => {
-        r.result_filters.push(filter_from_text_segment(text));
+        console.log(text);
+        r.image_filter = new LogicalOperatorFilter(ResultTypeEnum.IMAGE, r.image_filter,
+            filter_from_text_segment(ResultTypeEnum.IMAGE, text), LogicalOperatorEnum.AND);
+        r.album_filter = new LogicalOperatorFilter(ResultTypeEnum.ALBUM, r.album_filter,
+            filter_from_text_segment(ResultTypeEnum.ALBUM, text), LogicalOperatorEnum.AND);
     });
 
     console.log(search_string);
     console.log(r);
+    console.log(maybe_image_query(r));
 }