basic Moon template parser

src/compiler/parser.js

@@ -0,0 +1,111 @@
+import { error } from "../util/util.js";
+
+const WHITESPACE_RE = /\s/;
+
+const pushChild = (child, stack) => {
+  stack[stack.length - 1].children.push(child);
+};
+
+const parseOpeningTag = (index, input, length, stack) => {
+  let type = "";
+
+  for (; index < length; index++) {
+    const char = input[index];
+
+    if (char === ">") {
+      const element = {
+        type: type,
+        children: []
+      };
+
+      pushChild(element, stack);
+      stack.push(element);
+
+      index += 1;
+      break;
+    } else if (char === "/" && input[index + 1] === ">") {
+      pushChild({
+        type: type,
+        children: []
+      }, stack);
+
+      index += 2;
+      break;
+    } else {
+      type += char;
+    }
+  }
+
+  return index;
+};
+
+const parseClosingTag = (index, input, length, stack) => {
+  let type = "";
+
+  for(; index < length; index++) {
+    const char = input[index];
+
+    if (char === ">") {
+      index += 1;
+      break;
+    } else {
+      type += char;
+    }
+  }
+
+  if (type !== stack.pop().type && process.env.MOON_ENV === "development") {
+    error(`Unclosed tag "${type}"`);
+  }
+
+  return index;
+};
+
+const parseText = (index, input, length, stack) => {
+  let content = "";
+
+  for (; index < length; index++) {
+    const char = input[index];
+
+    if (char === "<") {
+      break;
+    } else {
+      content += char;
+    }
+  }
+
+  pushChild({
+    type: "m-text",
+    content: content
+  }, stack);
+
+  return index;
+};
+
+const parse = (input) => {
+  const length = input.length;
+
+  const root = {
+    type: "m-fragment",
+    children: []
+  };
+
+  let stack = [root];
+
+  for (let i = 0; i < length;) {
+    const char = input[i];
+
+    if (char === "<") {
+      if (input[i + 1] === "!" && input[i + 2] === "-" && input[i + 3] === "-") {
+        i = parseComment(i + 4, input, length, stack);
+      } else if (input[i + 1] === "/") {
+        i = parseClosingTag(i + 2, input, length, stack);
+      } else {
+        i = parseOpeningTag(i + 1, input, length, stack);
+      }
+    } else {
+      i = parseText(i, input, length, stack);
+    }
+  }
+
+  return root;
+};