started defining syntax with Lark in EBNF

spip2md/content.py

@@ -1,5 +1,63 @@
 from lark import Lark
 
+spipParser = Lark(
+    r"""
+    section: /\n\r?/
+           ( heading
+           | list
+           | table
+           | separator
+           | quote
+           | paragraph
+           ) /\n\r?/
+
+    heading: "{{{" paragraph "}}}"
+
+    list: unordered_list
+        | unordered_sublist
+        | ordered_list
+        | ordered_sublist
+
+    unordered_list: (/\n\r?-* / paragraph)+
+    unordered_sublist: (/\n\r?-*{2,7} / paragraph)+
+    ordered_list: (\/n/r?-# / paragraph)+
+    ordered_sublist: (\/n/r?-#{2,7} / paragraph)+
+
+    table: row+
+    row: /\n\r?\|/ cell+
+    cell: paragraph "|"
+
+    separator: /-{4,}/
+
+    quote: "<quote>" paragraph "</quote>"
+
+    paragraph: text+
+
+    text: format_text
+        | link
+        | /[^\n\r]+/
+
+    format_text: italic
+               | bold
+               | bold_italic
+
+    italic: "{" /[^\n\r]+/ "}"
+    bold: "{{" /[^\n\r]+/ "}}"
+    bold_italic: "{{ {" /[^\n\r]+/ "} }}" | "{ {{" /[^\n\r]+/ "}} }"
+
+    link: internal_link
+        | external_link
+        | footnote
+        | glossary
+
+    internal_link: "[" /[^\n\r]+/ "->" /[^\n\r]+/ "]"
+    external_link: "[" /[^\n\r]+/ "->" /[a-z]{3,6}://[^\n\r]+/ "]"
+    footnote: "[[" /[^\n\r]+/ "]]"
+    footnote: "[?" /[^\n\r]+/ "]"
+""",
+    start="section",
+)
+
 
 class content:
     def __init__(self, content):