mirror of
https://github.com/lightpanda-io/browser.git
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markdown: working duckduckgo
This commit is contained in:
Francis Bouvier
@@ -21,195 +21,254 @@ const std = @import("std");
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const parser = @import("netsurf.zig");
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const Walker = @import("dom/walker.zig").WalkerChildren;
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const URL = @import("../url.zig").URL;
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const NP = "\n\n";
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const Elem = struct {
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inlin: bool = false,
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list_order: ?u8 = null,
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parent: ?*Elem = null,
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};
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const State = struct {
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block: bool,
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last_char: u8,
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elem: ?*Elem = null,
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fn is_inline(state: *State) bool {
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if (state.elem == null) return false;
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return state.elem.?.inlin;
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}
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fn last_char_space(state: *State) bool {
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if (state.last_char == ' ' or state.last_char == '\n') return true;
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return false;
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}
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};
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// writer must be a std.io.Writer
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pub fn writeMarkdown(doc: *parser.Document, writer: anytype) !void {
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_ = try writeChildren(parser.documentToNode(doc), true, writer);
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pub fn writeMarkdown(url: URL, doc: *parser.Document, writer: anytype) !void {
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var state = State{ .block = true, .last_char = '\n' };
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_ = try writeChildren(url, parser.documentToNode(doc), &state, writer);
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try writer.writeAll("\n");
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}
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fn writeChildren(root: *parser.Node, new_para: bool, writer: anytype) !bool {
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fn writeChildren(url: URL, root: *parser.Node, state: *State, writer: anytype) !void {
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const walker = Walker{};
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var next: ?*parser.Node = null;
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var _new_para = new_para;
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while (true) {
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next = try walker.get_next(root, next) orelse break;
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_new_para = try writeNode(next.?, _new_para, writer);
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try writeNode(url, next.?, state, writer);
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}
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return _new_para;
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}
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fn skipTextChild(root: *parser.Node) !*parser.Node {
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const child = parser.nodeFirstChild(root) orelse return root;
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const node_type = try parser.nodeType(child);
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if (node_type == .text) return child;
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return root;
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fn ensureBlock(state: *State, writer: anytype) !void {
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if (state.is_inline()) return;
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if (!state.block) {
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try writer.writeAll(NP);
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state.last_char = '\n';
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state.block = true;
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}
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}
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// the returned boolean can be either:
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// - true if a new paragraph has been written at the end
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// - false if an inline text (ie. without new paragraph) has been written at the end
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// - the value of the writeChildren function if it has been called recursively at the end
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// - the new_para received as argument otherwise
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fn writeNode(node: *parser.Node, new_para: bool, writer: anytype) anyerror!bool {
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fn writeInline(state: *State, text: []const u8, writer: anytype) !void {
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try writer.writeAll(text);
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state.last_char = text[text.len - 1];
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if (state.block) state.block = false;
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}
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const order = [_][]const u8{
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"1", "2", "3", "4", "5", "6", "7", "8", "9", "10",
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"11", "12", "13", "14", "15", "16", "17", "18", "19", "20",
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"21", "22", "23", "24", "25", "26", "27", "28", "29", "30",
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"31", "32", "33", "34", "35", "36", "37", "38", "39", "40",
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"41", "42", "43", "44", "45", "46", "47", "48", "49", "50",
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};
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fn writeNode(url: URL, node: *parser.Node, state: *State, writer: anytype) anyerror!void {
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switch (try parser.nodeType(node)) {
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.element => {
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const html_element: *parser.ElementHTML = @ptrCast(node);
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const tag = try parser.elementHTMLGetTagType(html_element);
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// debug
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// try writer.writeAll("\nstart - ");
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// try writer.writeAll(@tagName(tag));
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// try writer.writeAll("-");
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// if (new_para) {
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// try writer.writeAll("1");
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// } else {
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// try writer.writeAll("0");
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// }
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// try writer.writeAll("\n");
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switch (tag) {
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// skip element, go to children
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.html, .head, .header, .footer, .meta, .link, .body => {
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return try writeChildren(node, new_para, writer);
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.html, .head, .meta, .link, .body, .span => {
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try writeChildren(url, node, state, writer);
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},
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// skip element and children (eg. text)
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.title, .i, .script, .noscript, .undef, .style => return new_para,
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// skip element and children
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.title, .i, .script, .noscript, .undef, .style => {},
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// generic elements
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.h1, .h2, .h3, .h4 => {
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if (!new_para) {
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try writer.writeAll(NP);
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}
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.h1, .h2, .h3, .h4, .h5, .h6 => {
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try ensureBlock(state, writer);
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if (!state.is_inline()) {
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switch (tag) {
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.h1 => try writer.writeAll("# "),
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.h2 => try writer.writeAll("## "),
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.h3 => try writer.writeAll("### "),
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.h4 => try writer.writeAll("#### "),
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.h1 => try writeInline(state, "# ", writer),
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.h2 => try writeInline(state, "## ", writer),
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.h3 => try writeInline(state, "### ", writer),
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.h4 => try writeInline(state, "#### ", writer),
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.h5 => try writeInline(state, "##### ", writer),
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.h6 => try writeInline(state, "###### ", writer),
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else => @panic("only headers tags are supported here"),
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}
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const np = try writeChildren(node, false, writer);
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if (!np) try writer.writeAll(NP);
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return true;
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}
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try writeChildren(url, node, state, writer);
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try ensureBlock(state, writer);
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},
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// containers and dividers
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.nav, .section, .article, .p, .div, .button, .form => {
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if (!new_para) try writer.writeAll(NP);
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const np = try writeChildren(node, true, writer);
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if (!np) try writer.writeAll(NP);
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return true;
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},
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.span => {
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return try writeChildren(node, new_para, writer);
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},
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.b => {
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try writer.writeAll("**");
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_ = try writeChildren(node, false, writer);
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try writer.writeAll("**");
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return false;
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.header, .footer, .nav, .section, .div, .article, .p, .button, .form => {
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try ensureBlock(state, writer);
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try writeChildren(url, node, state, writer);
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try ensureBlock(state, writer);
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},
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.br => {
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if (!new_para) try writer.writeAll(NP);
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return try writeChildren(node, true, writer);
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try ensureBlock(state, writer);
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try writeChildren(url, node, state, writer);
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},
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.hr => {
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if (!new_para) try writer.writeAll(NP);
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try writer.writeAll("---");
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try writer.writeAll(NP);
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return true;
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try ensureBlock(state, writer);
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try writeInline(state, "---", writer);
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try ensureBlock(state, writer);
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},
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// styling
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.b => {
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var elem = Elem{ .parent = state.elem, .inlin = true };
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state.elem = &elem;
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defer state.elem = elem.parent;
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try writeInline(state, "**", writer);
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try writeChildren(url, node, state, writer);
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try writeInline(state, "**", writer);
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},
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// specific elements
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.a => {
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if (!state.last_char_space()) try writeInline(state, " ", writer);
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var elem = Elem{ .parent = state.elem, .inlin = true };
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state.elem = &elem;
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defer state.elem = elem.parent;
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const element = parser.nodeToElement(node);
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if (try getAttributeValue(element, "href")) |href| {
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// TODO: absolute path?
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try writer.writeAll("[");
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_ = try writeChildren(node, false, writer);
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try writer.writeAll("](");
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try writer.writeAll(href);
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try writer.writeAll(")");
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return false;
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try writeInline(state, "[", writer);
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try writeChildren(url, node, state, writer);
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try writeInline(state, "](", writer);
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// handle relative path
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if (href[0] == '/') {
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try writeInline(state, url.scheme(), writer);
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try writeInline(state, "://", writer);
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try writeInline(state, url.host(), writer);
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}
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try writeInline(state, href, writer);
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try writeInline(state, ")", writer);
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} else {
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try writeChildren(url, node, state, writer);
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}
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return try writeChildren(node, new_para, writer);
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},
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.img => {
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var elem = Elem{ .parent = state.elem, .inlin = true };
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state.elem = &elem;
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defer state.elem = elem.parent;
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const element = parser.nodeToElement(node);
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if (try getAttributeValue(element, "src")) |src| {
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// TODO: absolute path?
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try writer.writeAll("![");
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try writeInline(state, "![", writer);
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if (try getAttributeValue(element, "alt")) |alt| {
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try writer.writeAll(alt);
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try writeInline(state, alt, writer);
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} else {
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try writer.writeAll(src);
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try writeInline(state, src, writer);
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}
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try writer.writeAll("](");
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try writer.writeAll(src);
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try writer.writeAll(")");
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return false;
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try writeInline(state, "](", writer);
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// handle relative path
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if (src[0] == '/') {
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try writeInline(state, url.scheme(), writer);
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try writeInline(state, "://", writer);
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try writeInline(state, url.host(), writer);
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}
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try writeInline(state, src, writer);
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try writeInline(state, ")", writer);
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}
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return new_para;
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},
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.ol => {
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if (!new_para) try writer.writeAll(NP);
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const np = try writeChildren(node, true, writer);
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if (!np) try writer.writeAll(NP);
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return true;
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},
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.ul => {
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if (!new_para) try writer.writeAll(NP);
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const np = try writeChildren(node, true, writer);
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if (!np) try writer.writeAll(NP);
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return true;
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var elem = Elem{ .parent = state.elem, .list_order = 0 };
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state.elem = &elem;
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defer state.elem = elem.parent;
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try ensureBlock(state, writer);
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try writeChildren(url, node, state, writer);
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try ensureBlock(state, writer);
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},
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.li => {
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if (!new_para) try writer.writeAll("\n");
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try writer.writeAll("- ");
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return try writeChildren(node, false, writer);
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.ol => {
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var elem = Elem{ .parent = state.elem, .list_order = 1 };
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state.elem = &elem;
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defer state.elem = elem.parent;
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try ensureBlock(state, writer);
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try writeChildren(url, node, state, writer);
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try ensureBlock(state, writer);
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},
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.li => blk: {
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const parent = state.elem orelse break :blk;
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const list_order = parent.list_order orelse break :blk;
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if (!state.block) try writer.writeAll("\n");
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if (list_order > 0) {
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// ordered list
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try writeInline(state, order[list_order - 1], writer);
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try writeInline(state, ". ", writer);
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parent.list_order = list_order + 1;
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} else {
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// unordered list
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try writeInline(state, "- ", writer);
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}
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try writeChildren(url, node, state, writer);
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},
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.input => {
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var elem = Elem{ .parent = state.elem, .inlin = true };
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state.elem = &elem;
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defer state.elem = elem.parent;
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const element = parser.nodeToElement(node);
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if (try getAttributeValue(element, "value")) |value| {
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try writer.writeAll(value);
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try writer.writeAll(" ");
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try writeInline(state, value, writer);
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try writeInline(state, " ", writer);
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}
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return false;
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},
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else => {
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try writer.writeAll("\n");
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try ensureBlock(state, writer);
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try writer.writeAll(@tagName(tag));
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try writer.writeAll(" not supported\n");
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try writer.writeAll(" not supported");
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try ensureBlock(state, writer);
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},
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}
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// panic
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// try writer.writeAll("\nend - ");
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// try writer.writeAll(@tagName(tag));
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// try writer.writeAll("\n");
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},
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.text => {
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const v = try parser.nodeValue(node) orelse return new_para;
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const printed = try writeText(v, writer);
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if (printed) return false;
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return new_para;
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},
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.cdata_section => {
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return new_para;
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},
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.comment => {
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return new_para;
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const v = try parser.nodeValue(node) orelse return;
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const printed = try writeText(state, v, writer);
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if (printed) state.block = false;
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},
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.cdata_section => {},
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.comment => {},
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// TODO handle processing instruction dump
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.processing_instruction => return new_para,
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.processing_instruction => {},
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// document fragment is outside of the main document DOM, so we
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// don't output it.
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.document_fragment => return new_para,
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.document_fragment => {},
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// document will never be called, but required for completeness.
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.document => return new_para,
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.document => {},
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// done globally instead, but required for completeness. Only the outer DOCTYPE should be written
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.document_type => return new_para,
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.document_type => {},
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// deprecated
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.attribute, .entity_reference, .entity, .notation => return new_para,
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.attribute, .entity_reference, .entity, .notation => {},
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}
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return new_para;
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}
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// TODO: not sure about + - . ! as they are very common characters
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@@ -217,12 +276,12 @@ fn writeNode(node: *parser.Node, new_para: bool, writer: anytype) anyerror!bool
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// TODO: | (pipe)
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const escape = [_]u8{ '\\', '`', '*', '_', '{', '}', '[', ']', '<', '>', '(', ')', '#' };
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fn writeText(value: []const u8, writer: anytype) !bool {
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fn writeText(state: *State, value: []const u8, writer: anytype) !bool {
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if (value.len == 0) return false;
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var last_char: u8 = ' ';
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var printed: u64 = 0;
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for (value) |v| {
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for (value, 0..) |v, i| {
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// do not print:
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// - multiple spaces
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// - return line
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@@ -236,10 +295,17 @@ fn writeText(value: []const u8, writer: anytype) !bool {
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if (v == esc) try writer.writeAll("\\");
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}
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if (printed == 0 and !state.is_inline()) {
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if (state.last_char != '\n' and state.last_char != ' ') {
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try writer.writeAll(" ");
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}
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}
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last_char = v;
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printed += 1;
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const x = [_]u8{v}; // TODO: do we have something better?
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try writer.writeAll(&x);
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if (i == value.len - 1) state.last_char = v;
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}
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if (printed > 0) return true;
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return false;
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@@ -157,7 +157,7 @@ pub const Page = struct {
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// if the page has a pointer to a document, converts the HTML in Markdown and dump it.
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const doc = parser.documentHTMLToDocument(self.window.document);
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try Markdown.writeMarkdown(doc, out);
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try Markdown.writeMarkdown(self.url, doc, out);
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}
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pub fn fetchModuleSource(ctx: *anyopaque, specifier: []const u8) !?[]const u8 {
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