commit fa62291f5119cdc95d2fffd921fdfcf7d1b537b2 Author: Kayne Ruse Date: Tue Mar 3 19:31:14 2020 +1100 Created the type graph diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..c88d148 --- /dev/null +++ b/.gitignore @@ -0,0 +1,23 @@ +#directories +logs/** +/**/coverage +/**/node_modules +/**/dl + +#passwords +/**/*.pwd +auth.json +.env + +#log files +/**/*.log + +#output files +public/*.html +public/*.js +public/*.css +public/*.map +public/*.gz + +# Non npm lock files +yarn.lock diff --git a/docs/notes.md b/docs/notes.md new file mode 100644 index 0000000..8220b5d --- /dev/null +++ b/docs/notes.md @@ -0,0 +1,49 @@ +simpleQL is a web API query language that mimics graphQL, designed solely for fun. + +simpleQL consists of two languages - the schema language, and the query language. The schema language is a layout of how queries should be made, as well as what can be made with them. + +There are two built-in keywords for the schema language: + +* type +* scalar + +`type` is used for defining new compound types. `scalar` is for defining new scalar types, such as `Date`. + +The built-in types for the schema language are: + +* String +* Integer +* Float +* Boolean + +These can be combined into compound types as so: + +``` +scalar Date + +type Book { + String title + Author author + Date published +} + +type Author { + !String name + !Book[] books +} +``` + +The query langauge can be used to request data from a server, either in whole or in part by listing it's type and it's fields, and subfields. + +``` +Book { + title + author { + name + books { + title + } + } +} +``` + diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..1b41a78 --- /dev/null +++ b/package-lock.json @@ -0,0 +1,374 @@ +{ + "name": "simpleql", + "version": "1.0.0", 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a/package.json b/package.json new file mode 100644 index 0000000..2e27e63 --- /dev/null +++ b/package.json @@ -0,0 +1,17 @@ +{ + "name": "simpleql", + "version": "1.0.0", + "description": "", + "main": "server/server.js", + "directories": { + "doc": "docs" + }, + "scripts": { + "node": "node server/server.js" + }, + "author": "Kayne Ruse", + "license": "ISC", + "dependencies": { + "express": "^4.17.1" + } +} diff --git a/server/schema.js b/server/schema.js new file mode 100644 index 0000000..5daab9a --- /dev/null +++ b/server/schema.js @@ -0,0 +1,14 @@ +module.exports = ` +scalar Date + +type Book { + String title + Author author + Date published +} + +type Author { + !String name + !Book[] books +} +`; \ No newline at end of file diff --git a/server/server.js b/server/server.js new file mode 100644 index 0000000..9ad18fd --- /dev/null +++ b/server/server.js @@ -0,0 +1,21 @@ +//express for testing +const express = require('express'); +const path = require('path'); +const app = express(); + +//test the library +const schema = require('./schema.js'); +//const handler = requre('./handler.js'); +const simpleQL = require('./simpleQL'); + +const simple = simpleQL(schema); + +//open the end +app.post('simpleQL', (req, res) => { + res.status(200).send(simple(req.body)); +}); + +//startup +app.listen(process.env.WEB_PORT || 3100, (err) => { + console.log(`listening to *:${process.env.WEB_PORT || 3100}`); +}); diff --git a/server/simpleQL/index.js b/server/simpleQL/index.js new file mode 100644 index 0000000..01d5688 --- /dev/null +++ b/server/simpleQL/index.js @@ -0,0 +1,104 @@ +//the main function to be returned +const main = (schema, handler) => { + const typeGraph = buildTypeGraph(schema); + + console.log(typeGraph); + + //the receiving function - this will be called multiple times + return reqBody => { + return ''; + }; +}; + +//parse the schema into a type graph +const buildTypeGraph = schema => { + //the default graph + let graph = { + String: { scalar: true }, + Integer: { scalar: true }, + Float: { scalar: true }, + Boolean: { scalar: true }, + }; + + //parse the schema + const tokens = schema.split(/(\s+)/).filter(s => s.trim().length > 0); + let pos = 0; + + while (tokens[pos]) { + //check for keywords + switch(tokens[pos++]) { + case 'type': + graph[tokens[pos]] = parseCompoundType(tokens, pos); + + //advance to the end of the compound type + while(tokens[pos] && tokens[pos++] != '}'); + + break; + + case 'scalar': + graph[tokens[pos++]] = { scalar: true }; + break; + + default: + throw 'Unknown token ' + tokens[pos -1]; + } + } + + return graph; +}; + +const parseCompoundType = (tokens, pos) => { + pos++; //eat the compound name + + //format check (not strictly necessary, but it looks nice) + if (tokens[pos++] != '{') { + throw 'Expected \'{\' in compound type definition'; + } + + //graph component to be returned + const compound = {}; + + //for each line of the compound type + while (tokens[pos] && tokens[pos] != '}') { + let type = tokens[pos++]; + const name = tokens[pos++]; + + //parse the extra typing data + let array = false; + let nullable = true; + + //not nullable + if (type[0] === '!') { + nullable = false; + type = type.slice(1); + } + + //is array + if (type.endsWith('[]')) { + array = true; + type = type.slice(0, type.length - 2); + } + + //no mangled types or names + checkAlphaNumeric(type); + checkAlphaNumeric(name); + + //finally, push to the compound definition + compound[name] = { + typeName: type, + array: array, + nullable: nullable, + }; + } + + return compound; +} + +const checkAlphaNumeric = (str) => { + if (!/^[a-z0-9]+$/i.test(str)) { + throw 'Unexpected string ' + str; + } +}; + +//return +module.exports = main; \ No newline at end of file