Initial work on collecting tail and text. Reorganizing for cleaner public API.

docs/experiments/parser.js

@@ -1,13 +1,33 @@
 import { createLineData, useDocument } from '@terrace/core'
 import { createStringReader } from '@terrace/core/readers/js-string'
 
+
+const tceSchema = `
+types
+  section object, text as content, tail as pos
+    content string
+    pos number
+    position number
+  options object
+    parameter1 number
+    parameter2 string
+
+root object
+  title string
+  options options
+  options2 options
+  subsection section
+`
+
 const schema = {
   types: {
-    subsection: {
+    section: {
       type: 'object',
       text: 'content',
-      tail: 'number',
+      tail: 'pos',
       values: {
+        content: 'string',
+        pos: 'number',
         position: {
           type: 'number'
         }
@@ -28,8 +48,7 @@ const schema = {
       options: 'options',
       options2: 'options',
       subsection: {
-        type: 'collection',
-        collection: 'subsection'
+        type: 'section',
       }
     }
   }
@@ -48,51 +67,49 @@ const lines = [
   ` Ea dolore in aliquip fugiat anim adipisicing amet aute tempor et deserunt est duis sint.`,
   `subsection 2`,
   ` position 2`,
-  ` Aute deserunt incididunt ad in sint adipisicing est officia velit pariatur ipsum deserunt quis nulla.`
+  ` Aute deserunt incididunt ad in sint adipisicing est officia velit pariatur ipsum deserunt quis nulla.`,
+  ` Ea dolore in aliquip fugiat anim adipisicing amet aute tempor et deserunt est duis sint.`
 ]
 
 
 const typeHandlers = {
-  string (key, definition, add) {
-    return (doc, handlers) => {
-      if (doc.head() !== key) return
-      add(key, doc.tail().slice(1))
-    }
+  string (doc) {
+    return doc.tail().slice(1)
   },
-  number (key, definition, add) {
-    return (doc, handlers) => {
-      if (doc.head() !== key) return
-      add(key, +doc.tail().slice(1))
-    }
+  number (doc) {
+    return +doc.tail().slice(1)
   },
-  object (key, definition, add) {
-    definition = resolve(definition)
-    return (doc, handlers) => {
-      if (doc.head() !== key) return
-      const object = {}
-      add(key, object)
+  object (doc, handlers, definition) {
+    definition = lookup(definition)
 
-      for (const [key, child] of Object.entries(definition.values)) {
-        addHandler(handlers, doc.level() + 1, key, child, (key, value) => (object[key] = value))
-      }
-    }
-  },
-  collection (key, definition, add) {
-    return (doc, handlers) => {
-      if (doc.head() !== key) return
-      const collection = []
-      add(key, collection)
+    const object = {}
 
-      const child = resolve(definition.collection)
-      addHandler(handlers, doc.level() + 1, '*', child, (key, value) => ( collection.push(value) ))
+    for (const [key, child] of Object.entries(definition.values)) {
+      addHandler(handlers, doc.level() + 1, key, child, (key, value) => {
+        object[key] = value
+      })
     }
+
+    if (definition.tail) {
+      object[definition.tail] = typeHandlers[definition.values[definition.tail]](doc, handlers)
+    }
+
+    if (definition.text) {
+      const textKey = definition.text
+      object[textKey] = ''
+      addHandler(handlers, doc.level() + 1, '', definition.values[textKey], (key, value) => {
+        object[textKey] += object[textKey] ? `\n${doc.line()}` : doc.line()
+      })
+    }
+
+    return object
   }
 }
 
-function resolve (definition) {
+function lookup (definition) {
   const type = typeof definition === 'string' ? definition : definition.type
-  if (schema.types[type]) return schema.types[type]
-  else return definition
+  const resolvedDefinition = schema.types[type] || definition
+  return typeof definition === 'string' ? resolvedDefinition : Object.assign({}, definition, resolvedDefinition)
 }
 
 function registerTypes(typeHandlers, types) {
@@ -102,22 +119,27 @@ function registerTypes(typeHandlers, types) {
   }
 }
 
-function addHandler(handlers, level, key, definition, add) {
+function addHandler(handlers, level, key, definition, resolve) {
   const type = typeof definition === 'string' ? definition : definition.type
   if (!handlers[level]) handlers[level] = []
-  handlers[level].push(typeHandlers[type](key, definition, add))
+  handlers[level].push({
+    key,
+    resolve,
+    definition,
+    handler: typeHandlers[type]
+  })
 }
 
 async function main() {
   const doc = useDocument(createStringReader(lines))
-
   const handlers = []
 
   registerTypes(typeHandlers, schema.types)
 
   const root = {}
+
   for (const [key, child] of Object.entries(schema.root.values)) {
-    addHandler(handlers, 0, key, child, (key, value) => (root[key] = value))
+    addHandler(handlers, 0, key, child, (k, v) => (root[k] = v))
   }
 
   let ended = false
@@ -128,8 +150,16 @@ async function main() {
     const level = doc.level()
     handlers.length = level + 1
 
-    for (const handler of handlers[level] || []) {
-      handler(doc, handlers)
+    const unmatchedHandler = handlers[level].find(h => h.key === '')
+    let matched = false
+    for (const { key, definition, resolve, handler } of handlers[level] || []) {
+      if (doc.head() !== key) continue;
+      resolve(doc.head(), handler(doc, handlers, definition))
+      matched = true
+    }
+    if (!matched && unmatchedHandler) {
+      const { resolve, definition, handler } = unmatchedHandler
+      resolve(doc.head(), handler(doc, handlers, definition))
     }
   }