Implemented update

README.md

@@ -154,7 +154,6 @@ The fields can be altered as well, using the query language's built-in keywords:
 * update
 * delete
 * match
-* set
 * typeName (this is not used in either language, but rather is used internally)
 
 `create`, `update` and `delete` are still to be defined properly, but they'll probably work as follows.
@@ -202,19 +201,19 @@ create Book [
 
 ### Update
 
-When using `update`, `match` will find all existing records and update those using the `set` keyword:
+When using `update`, `match` will find all existing records and update those using the `update` keyword:
 
 ```
 update Book {
 	match title "The Wind in the Willows"
-	set published "1908-4-1"
+	update published "1908-04-01"
 }
 ```
 
 ```
 update Book {
 	match title "The Wind in the Willows"
-	set title "The Fart in the Fronds"
+	update title "The Fart in the Fronds"
 }
 ```
 
@@ -224,31 +223,31 @@ You can run multiple updates at once by surrounding them with `[]`:
 update Book [
 	{
 		match title "The Philosopher's Kidney Stone"
-		set published "1997-06-26"
+		update published "1997-06-26"
 	}
 	{
 		match title "The Chamber Pot of Secrets"
-		set published "1998-07-02"
+		update published "1998-07-02"
 	}
 	{
 		match title "The Prisoner of Aunt Kazban"
-		set published "1999-07-08"
+		update published "1999-07-08"
 	}
 	{
 		match title "The Goblet of the Fire Cocktail"
-		set published "2000-07-08"
+		update published "2000-07-08"
 	}
 	{
 		match title "The Order for Kleenex"
-		set published "2003-06-21"
+		update published "2003-06-21"
 	}
 	{
 		match title "The Half-Priced Pharmacy"
-		set published "2005-07-16"
+		update published "2005-07-16"
 	}
 	{
 		match title "Yeah, I Got Nothing"
-		set published "2007-07-21"
+		update published "2007-07-21"
 	}
 ]
 ```

source/index.js

@@ -2,6 +2,7 @@ const buildTypeGraph = require('./build-type-graph');
 const parseInput = require('./parse-input');
 const parseQueryTree = require('./parse-query-tree');
 const parseCreateTree = require('./parse-create-tree');
+const parseUpdateTree = require('./parse-update-tree');
 
 //the main function to be returned (sineQL())
 const sineQL = (schema, { queryHandlers, createHandlers }, options = {}) => {
@@ -39,6 +40,20 @@ const sineQL = (schema, { queryHandlers, createHandlers }, options = {}) => {
 					return [200, result];
 
 				case 'update':
+					if (!updateHandlers) {
+						return [501, 'Update handlers not implemented'];
+					}
+
+					if (!updateHandlers[tokens[1]]) {
+						throw `Update handler not implemented for that type: ${tokens[1]}`;
+					}
+
+					const updateTree = parseUpdateTree(tokens, typeGraph, options);
+
+					const result = await updateHandlers[tokens[1]](updateTree, typeGraph);
+
+					return [200, result];
+
 				case 'delete':
 					return [501, 'Keyword not yet implemented: ' + tokens[0]];
 					//TODO: implement these keywords

source/keywords.json

@@ -1 +1 @@
-["type", "scalar", "create", "update", "delete", "set", "match", "unique", "typeName"]
+["type", "scalar", "create", "update", "delete", "match", "unique", "typeName"]

source/parse-create-tree.js

@@ -130,9 +130,21 @@ const readBlock = (tokens, current, superType, typeGraph, options) => {
 
 			//insert the block-level modifier signal
 			if (modifier) {
+				//handle integers and floats exposed to the user
+				switch(result[fieldName].typeName) {
+					case 'Integer': 
+					result[fieldName][modifier] = parseInt(tokens[current++]);
+						break;
+
+					case 'Float':
+						result[fieldName][modifier] = parseFloat(tokens[current++]);
+						break;
+
+					default: //everything else is a string (including booleans)
 						result[fieldName][modifier] = tokens[current++];
+				}
 			} else {
-				result[fieldName]['set'] = tokens[current++];
+				throw `Modifier expected for ${fieldName} (either create or match)`;
 			}
 
 			if (options.debug) {

source/parse-query-tree.js

@@ -91,8 +91,21 @@ const readBlock = (tokens, current, superType, typeGraph, options) => {
 
 			//insert the block-level modifier signal
 			if (modifier) {
+				//handle integers and floats exposed to the user
+				switch(result[fieldName].typeName) {
+					case 'Integer': 
+					result[fieldName][modifier] = parseInt(tokens[current++]);
+						break;
+
+					case 'Float':
+						result[fieldName][modifier] = parseFloat(tokens[current++]);
+						break;
+
+					default: //everything else is a string (including booleans)
 						result[fieldName][modifier] = tokens[current++];
 				}
+			}
+			//no else-clause, since queries don't require modifiers
 
 			if (options.debug) {
 				console.log(`${fieldName}: `, result[fieldName]);

source/parse-update-tree.js

@@ -0,0 +1,161 @@
+//build the tokens into a single object of types representing the initial query
+const parseUpdateTree = (tokens, typeGraph, options = {}) => {
+	let current = 1; //primed
+
+	//check this is a update command
+	if (tokens[current - 1] != 'update') {
+		throw 'Expected update keyword at the beginning of update command';
+	}
+
+	current++;
+
+	//get a token that matches a type
+	if (!typeGraph[tokens[current - 1]]) {
+		throw `Expected a type in the type graph (found ${tokens[current - 1]})`;
+	}
+
+	//check that there are the correct number of '{' and '}'
+	if (tokens.reduce((running, tok) => tok == '{' ? running + 1 : tok == '}' ? running - 1 : running, 0) != 0) {
+		throw `Unequal number of '{' and '}' found`;
+	}
+
+	//check that there are the correct number of '[' and ']'
+	if (tokens.reduce((running, tok) => tok == '[' ? running + 1 : tok == ']' ? running - 1 : running, 0) != 0) {
+		throw `Unequal number of '[' and ']' found`;
+	}
+
+	//the return
+	const result = [];
+	const type = tokens[current - 1];
+
+	if (tokens[current] == '[') {
+		current++;
+	}
+
+	do {
+		//read the block of lines
+		const [block, pos] = readBlock(tokens, current, type, typeGraph, options);
+
+		//insert the typename into the top-level block
+		block['typeName'] = type;
+
+		//insert update into the top-level block
+		block['update'] = true;
+
+		current = pos;
+
+		result.push(block);
+	} while (tokens[current] && tokens[current] != ']');
+
+	//finally
+	return result;
+};
+
+const readBlock = (tokens, current, superType, typeGraph, options) => {
+	//scan the '{'
+	if (tokens[current++] != '{') {
+		throw `Expected '{' at beginning of a block (found ${tokens[current - 1]})`;
+	}
+
+	//result
+	const result = {};
+
+	//scan each "line" in this block
+	while(tokens[current++] && tokens[current - 1] != '}') {
+		//check for block-level keywords (modifiers need to form a chain from the leaf)
+		let modifier = null;
+		if (['update', 'match'].includes(tokens[current - 1])) {
+			modifier = tokens[current - 1];
+			current++;
+		}
+
+		//read field name
+		const fieldName = tokens[current - 1];
+
+		if (options.debug) {
+			console.log(`Trying to process field ${fieldName}`);
+		}
+
+		//if the field is not present in the type
+		if (!typeGraph[superType][fieldName]) {
+			throw `Unexpected field name ${fieldName} in type ${superType}`;
+		}
+
+		//if the field is non-scalar, read the sub-block
+		if (!typeGraph[typeGraph[superType][fieldName].typeName].scalar) {
+			if (tokens[current] == '[') {
+				current++;
+			}
+
+			do {
+				//recurse
+				const [block, pos] = readBlock(tokens, current, typeGraph[superType][fieldName].typeName, typeGraph, options);
+
+				//insert the typename into the block
+				block['typeName'] = typeGraph[superType][fieldName].typeName;
+
+				//insert the unique modifier if it's set
+				block['unique'] = typeGraph[superType][fieldName].unique;
+
+				//insert the block-level modifier signal
+				if (modifier) {
+					block[modifier] = true;
+				} else {
+					throw `Modifier expected for ${fieldName} (either update or match)`;
+				}
+
+				//insert into result
+				result[fieldName] = result[fieldName] || [];
+				result[fieldName].push(block);
+
+				current = pos; //pos points past the end of the block
+
+				if (options.debug) {
+					console.log(`${fieldName}:`);
+					console.dir(result[fieldName], { depth: null });
+				}
+			} while (tokens[current] && tokens[current] == '{');
+			current++;
+
+			continue;
+		}
+
+		//scalar
+		else {
+			//save the typeGraph type into result
+			result[fieldName] = JSON.parse(JSON.stringify( typeGraph[ typeGraph[superType][fieldName].typeName ] ));
+
+			//insert the unique modifier if it's set
+			result[fieldName]['unique'] = typeGraph[superType][fieldName].unique;
+
+			//insert the block-level modifier signal
+			if (modifier) {
+				//handle integers and floats exposed to the user
+				switch(result[fieldName].typeName) {
+					case 'Integer': 
+					result[fieldName][modifier] = parseInt(tokens[current++]);
+						break;
+
+					case 'Float':
+						result[fieldName][modifier] = parseFloat(tokens[current++]);
+						break;
+
+					default: //everything else is a string (including booleans)
+						result[fieldName][modifier] = tokens[current++];
+				}
+			} else {
+				throw `Modifier expected for ${fieldName} (either update or match)`;
+			}
+
+			if (options.debug) {
+				console.log(`${fieldName}: `, result[fieldName]);
+			}
+
+			continue;
+		}
+	}
+
+	return [result, current];
+};
+
+module.exports = parseUpdateTree;

test/parse-create-tree.test.js

@@ -24,7 +24,7 @@ const simpleBookQuery = `
 
 create Book {
 	create title "The Wind in the Willows"
-	create published "1908"
+	create published "1908-04-01"
 	create rating 9.5
 }
 

test/parse-update-tree.test.js

@@ -0,0 +1,160 @@
+const buildTypeGraph = require('../source/build-type-graph');
+const parseInput = require('../source/parse-input');
+const parseUpdateTree = require('../source/parse-update-tree');
+
+//schemas
+const simpleSchema = `
+
+scalar Date
+
+type Book {
+	unique String title
+	Date published
+	Float rating
+}
+
+type Author {
+	unique String name
+	Book books
+}
+
+`;
+
+const simpleBookQuery = `
+
+update Book {
+	match title "The Wind in the Willows"
+	update rating 9.5
+}
+
+`;
+
+const compoundBookQuery = `
+
+update Book [
+	{
+		match title "The Philosopher's Kidney Stone"
+		update published "1997-06-26"
+	}
+	{
+		match title "The Chamber Pot of Secrets"
+		update published "1998-07-02"
+	}
+	{
+		match title "The Prisoner of Aunt Kazban"
+		update published "1999-07-08"
+	}
+	{
+		match title "The Goblet of the Fire Cocktail"
+		update published "2000-07-08"
+	}
+	{
+		match title "The Order for Kleenex"
+		update published "2003-06-21"
+	}
+	{
+		match title "The Half-Priced Pharmacy"
+		update published "2005-07-16"
+	}
+	{
+		match title "Yeah, I Got Nothing"
+		update published "2007-07-21"
+	}
+]
+
+`;
+
+const simpleAuthorQuery = `
+
+update Author {
+	match name "Kenneth Grahame"
+	update books {
+		match title "The Wind in the Willows"
+	}
+}
+
+`;
+
+const compoundAuthorQuery = `
+
+update Author {
+	match name "J. K. Rolling"
+	update books [
+		{ match title "The Philosopher's Kidney Stone" }
+		{ match title "The Chamber Pot of Secrets" }
+		{ match title "The Prisoner of Aunt Kazban" }
+		{ match title "The Goblet of the Fire Cocktail" }
+		{ match title "The Order for Kleenex" }
+		{ match title "The Half-Priced Pharmacy" }
+		{ match title "Yeah, I Got Nothing" }
+	]
+}
+
+`;
+
+//do stuff
+test('parseUpdateTree - update a single book', () => {
+	//setup
+	const tokens = parseInput(simpleBookQuery, true);
+	const graph = buildTypeGraph(simpleSchema);
+
+	//process
+	const updateTree = parseUpdateTree(tokens, graph);
+
+	//inspect
+	expect(updateTree.length).toEqual(1);
+	expect(updateTree[0].update).toEqual(true);
+	expect(updateTree[0].title.match).toEqual('The Wind in the Willows');
+	expect(updateTree[0].rating.update).toEqual(9.5);
+});
+
+test('parseUpdateTree - update multiple books', () => {
+	//setup
+	const tokens = parseInput(compoundBookQuery, true);
+	const graph = buildTypeGraph(simpleSchema);
+
+	//process
+	const updateTree = parseUpdateTree(tokens, graph);
+
+	//inspect
+	expect(updateTree.length).toEqual(7);
+	expect(updateTree[0].update).toEqual(true);
+	expect(updateTree[0].title.match).toEqual('The Philosopher\'s Kidney Stone');
+	expect(updateTree[0].published.update).toEqual('1997-06-26');
+});
+
+test('parseUpdateTree - single join', () => {
+	//setup
+	const tokens = parseInput(simpleAuthorQuery, true);
+	const graph = buildTypeGraph(simpleSchema);
+
+	//process
+	const updateTree = parseUpdateTree(tokens, graph);
+
+	//inspect
+	expect(updateTree.length).toEqual(1);
+	expect(updateTree[0].typeName).toEqual('Author');
+	expect(updateTree[0].update).toEqual(true);
+	expect(updateTree[0].name.match).toEqual('Kenneth Grahame');
+	expect(updateTree[0].books.length).toEqual(1);
+	expect(updateTree[0].books[0].title.match).toEqual('The Wind in the Willows');
+});
+
+test('parseUpdateTree - multiple join', () => {
+	//setup
+	const tokens = parseInput(compoundAuthorQuery, true);
+	const graph = buildTypeGraph(simpleSchema);
+
+	//process
+	const updateTree = parseUpdateTree(tokens, graph);
+
+	//inspect
+	expect(updateTree.length).toEqual(1);
+	expect(updateTree[0].typeName).toEqual('Author');
+	expect(updateTree[0].update).toEqual(true);
+	expect(updateTree[0].name.match).toEqual('J. K. Rolling');
+	expect(updateTree[0].books.length).toEqual(7);
+	expect(updateTree[0].books[0].title.match).toEqual('The Philosopher\'s Kidney Stone');
+	expect(updateTree[0].books[6].title.match).toEqual('Yeah, I Got Nothing');
+});
+