par(md): add loop...

... to allow parse many headers

par/md.test.ts

@@ -4,6 +4,16 @@ import { MarkdownParser } from "./md.ts";
 
 const ren = new HtmlStrRenderer();
 
+Deno.test({
+  name: "should skip new line character",
+  fn: () => {
+    const par = new MarkdownParser();
+    assertEquals(ren.render(par.parse("\n")), "");
+    assertEquals(ren.render(par.parse("\r\n")), "");
+    assertEquals(ren.render(par.parse("\n\r\n")), "");
+  },
+});
+
 Deno.test({
   name: "should parse empty ATX header",
   fn: () => {
@@ -42,6 +52,8 @@ Deno.test({
     assertEquals(ren.render(par.parse(" # hello")), "<h1>hello</h1>");
     assertEquals(ren.render(par.parse("  # hello")), "<h1>hello</h1>");
     assertEquals(ren.render(par.parse("   # hello")), "<h1>hello</h1>");
+    assertEquals(ren.render(par.parse("\n   # hello")), "<h1>hello</h1>");
+    assertEquals(ren.render(par.parse("\r\n   # hello")), "<h1>hello</h1>");
   },
 });
 
@@ -56,3 +68,21 @@ Deno.test({
     assertEquals(ren.render(par.parse("###### hello #")), "<h6>hello</h6>");
   },
 });
+
+Deno.test({
+  name: "should parse many headers with text",
+  fn: () => {
+    const par = new MarkdownParser();
+
+    const input = `\
+# hello
+## world
+### this is
+#### my world!`;
+
+    assertEquals(
+      ren.render(par.parse(input)),
+      "<h1>hello</h1><h2>world</h2><h3>this is</h3><h4>my world!</h4>",
+    );
+  },
+});

par/md.ts

@@ -2,6 +2,8 @@ import { AnyNode, Elem, Fragment, TextNode } from "../core/node.ts";
 import { isNil } from "../core/utils.ts";
 import { Parser } from "./types.ts";
 
+const RE_NEW_LINE = /^\r?\n/;
+
 const RE_OPEN_ATX_HEADING = /^\s{0,3}(#{1,6})(\s|$)/;
 const RE_CLOSE_ATX_HEADING = /(^|\s+)#*\s*$/;
 
@@ -11,33 +13,50 @@ export class MarkdownParser implements Parser {
 
     let readStr = input;
 
-    const match = RE_OPEN_ATX_HEADING.exec(readStr);
-    if (!isNil(match)) {
-      readStr = readStr.slice(match[0].length);
-
-      const atxHeading: AstAtxHeading = {
-        kind: AstKind.AtxHeading,
-        level: match[1].length as HeadingLevel,
-        content: [],
-      };
-      ast.content.push(atxHeading);
-
-      if (match[2].length > 0) {
-        const endMatch = RE_CLOSE_ATX_HEADING.exec(readStr);
-
-        const headingContent = isNil(endMatch)
-          ? readStr.split("\n", 1)[0]
-          : readStr.slice(0, endMatch.index);
-        readStr = readStr.slice(headingContent.length);
-
-        if (headingContent.trim().length) {
-          const text: AstText = {
-            kind: AstKind.Text,
-            content: headingContent.trim(),
-          };
-          atxHeading.content.push(text);
+    while (readStr.trim().length) {
+      {
+        // 1. clear new line character
+        const match = RE_NEW_LINE.exec(readStr);
+        if (!isNil(match)) {
+          readStr = readStr.slice(match[0].length);
         }
       }
+
+      // 2. try to find atx heading sequence
+      const match = RE_OPEN_ATX_HEADING.exec(readStr);
+      if (!isNil(match)) {
+        readStr = readStr.slice(match[0].length);
+
+        const atxHeading: AstAtxHeading = {
+          kind: AstKind.AtxHeading,
+          level: match[1].length as HeadingLevel,
+          content: [],
+        };
+        ast.content.push(atxHeading);
+
+        if (match[2].length > 0) {
+          const endMatch = RE_CLOSE_ATX_HEADING.exec(readStr);
+
+          const headingContent = !isNil(endMatch)
+            ? readStr.slice(0, endMatch.index)
+            : readStr.includes("\n")
+            ? readStr.slice(0, readStr.indexOf("\n") + 1)
+            : readStr;
+          readStr = readStr.slice(
+            headingContent.length + (endMatch?.[0].length ?? 0),
+          );
+
+          if (headingContent.length) {
+            const text: AstText = {
+              kind: AstKind.Text,
+              content: headingContent.trim(),
+            };
+            atxHeading.content.push(text);
+          }
+        }
+      } else {
+        break;
+      }
     }
 
     return new Fragment(ast.content.map(Heading));