const std = @import("std");const tu = @import("text_util.zig"); pub fn codeFenceMarker(line: []const u8) ?u8 { if (line.len < 3) return null; const marker = line[0]; if (marker != '`' and marker != '~') return null; if (line[1] != marker or line[2] != marker) return null; return marker;} fn isCodeFence(line: []const u8) bool { return codeFenceMarker(line) != null;} pub fn codeFenceLanguage(line: []const u8) []const u8 { const info = std.mem.trim(u8, line[3..], " \t"); const end = std.mem.indexOfAny(u8, info, " \t") orelse info.len; return info[0..end];} pub fn hasIndentedCodePrefix(line: []const u8) bool { return line.len > 0 and (line[0] == '\t' or (line.len >= 4 and std.mem.eql(u8, line[0..4], " ")));} pub fn deindentCodeLine(line: []const u8) []const u8 { if (line[0] == '\t') return line[1..]; return line[4..];} const ParsedHeader = struct { level: usize, content: []const u8,}; pub fn parseHeader(line: []const u8) ?ParsedHeader { if (line.len == 0 or line[0] != '#') return null; var level: usize = 0; while (level < 6 and level < line.len and line[level] == '#') : (level += 1) {} if (level == 0 or level >= line.len) return null; if (line[level] != ' ') return null; return .{ .level = level, .content = line[level + 1 ..] };} pub fn parseSetextUnderline(line: []const u8) ?usize { var level: ?usize = null; for (line) |byte| { if (byte == ' ' or byte == '\t') continue; const next_level: usize = switch (byte) { '=' => 1, '-' => 2, else => return null, }; if (level) |existing| { if (existing != next_level) return null; } else { level = next_level; } } return level;} pub fn isSetextCandidate(line: []const u8) bool { if (line.len == 0 or line[0] == ' ' or line[0] == '\t' or line[0] == ':') return false; if (parseHeader(line) != null or parseBlockquote(line) != null) return false; if (parseUnorderedList(line) != null or parseOrderedList(line) != null) return false; return !isCodeFence(line) and !isPipeLine(line) and !isHorizontalRule(line) and parseSetextUnderline(line) == null;} pub fn definitionMarkerBody(line: []const u8) ?[]const u8 { if (line.len < 2 or line[0] != ':') return null; var body_start: usize = 1; while (body_start < line.len and (line[body_start] == ' ' or line[body_start] == '\t')) : (body_start += 1) {} if (body_start == 1 or body_start == line.len) return null; return line[body_start..];} pub const ParsedFootnoteDefinition = struct { label: []const u8, body: []const u8,}; pub fn parseFootnoteDefinition(line: []const u8) ?ParsedFootnoteDefinition { if (line.len < 6 or line[0] != '[' or line[1] != '^') return null; const close = std.mem.indexOfScalarPos(u8, line, 2, ']') orelse return null; if (close == 2 or close + 1 >= line.len or line[close + 1] != ':') return null; var body_start = close + 2; while (body_start < line.len and (line[body_start] == ' ' or line[body_start] == '\t')) : (body_start += 1) {} if (body_start == line.len) return null; return .{ .label = line[2..close], .body = line[body_start..] };} pub fn footnoteContinuationBody(line: []const u8) ?[]const u8 { if (line.len > 0 and line[0] == '\t') return line[1..]; if (line.len >= 2 and line[0] == ' ' and line[1] == ' ') return line[2..]; return null;} const ParsedBlockquote = struct { indent: []const u8, depth: usize, content: []const u8,}; pub const BlockquotePrefix = struct { indent: usize, depth: usize,}; pub fn parseBlockquote(line: []const u8) ?ParsedBlockquote { var i: usize = 0; while (i < line.len and line[i] == ' ') : (i += 1) {} const indent_end = i; if (i == line.len or line[i] != '>') return null; i += 1; if (i == line.len) return .{ .indent = line[0..indent_end], .depth = 1, .content = line[i..] }; if (line[i] != ' ') return null; i += 1; var depth: usize = 1; while (i < line.len and line[i] == '>') { const after_marker = i + 1; if (after_marker < line.len and line[after_marker] != ' ') break; depth += 1; i = after_marker; if (i == line.len) break; i += 1; } return .{ .indent = line[0..indent_end], .depth = depth, .content = line[i..] };} pub fn isBlockquoteParagraph(line: []const u8) bool { return isLazyBlockquoteContinuation(line);} pub fn isLazyBlockquoteContinuation(line: []const u8) bool { if (std.mem.trim(u8, line, " \t").len == 0) return false; if (parseBlockquote(line) != null or parseHeader(line) != null) return false; if (parseUnorderedList(line) != null or parseOrderedList(line) != null) return false; return codeFenceMarker(tu.leftTrim(line)) == null and !isPipeLine(line) and !isHorizontalRule(line);} const ParsedUnorderedList = struct { indent: []const u8, content: []const u8,}; pub fn parseUnorderedList(line: []const u8) ?ParsedUnorderedList { var i: usize = 0; while (i < line.len and (line[i] == ' ' or line[i] == '\t')) : (i += 1) {} if (i + 1 >= line.len) return null; if (line[i] != '-' and line[i] != '*') return null; if (line[i + 1] != ' ') return null; return .{ .indent = line[0..i], .content = line[i + 2 ..] };} const ParsedOrderedList = struct { indent: []const u8, marker: []const u8, content: []const u8,}; pub fn parseOrderedList(line: []const u8) ?ParsedOrderedList { var i: usize = 0; while (i < line.len and (line[i] == ' ' or line[i] == '\t')) : (i += 1) {} const indent_end = i; while (i < line.len and line[i] >= '0' and line[i] <= '9') : (i += 1) {} if (i == indent_end) return null; if (i + 1 >= line.len) return null; if (line[i] != '.') return null; if (line[i + 1] != ' ') return null; return .{ .indent = line[0..indent_end], .marker = line[indent_end .. i + 1], .content = line[i + 2 ..], };} pub const ParsedTaskListItem = struct { completed: bool, has_separator: bool, content: []const u8,}; pub fn parseTaskListItem(content: []const u8) ?ParsedTaskListItem { if (content.len < 3 or content[0] != '[' or content[2] != ']') return null; const completed = switch (content[1]) { ' ' => false, 'x', 'X' => true, else => return null, }; if (content.len == 3) { return .{ .completed = completed, .has_separator = false, .content = content[3..] }; } if (content[3] != ' ') return null; return .{ .completed = completed, .has_separator = true, .content = content[4..] };} pub fn isHorizontalRule(line: []const u8) bool { const trimmed = tu.leftTrim(line); if (trimmed.len < 3) return false; const rule_char = trimmed[0]; if (rule_char != '-' and rule_char != '*' and rule_char != '_') return false; var count: usize = 0; for (trimmed) |c| { if (c == rule_char) { count += 1; } else if (c != ' ' and c != '\t') { return false; } } return count >= 3;} pub fn isPipeLine(line: []const u8) bool { const trimmed = tu.leftTrim(line); if (trimmed.len == 0) return false; for (trimmed, 0..) |byte, index| { if (byte == '|' and !tu.isEscapedPunctuationAt(trimmed, index)) return true; } return false;} fn isSeparatorLine(line: []const u8) bool { const trimmed = tu.leftTrim(line); if (trimmed.len == 0) return false; var seen_dash = false; var seen_pipe = false; for (trimmed) |c| { switch (c) { '|' => seen_pipe = true, ':', ' ', '\t' => {}, '-' => seen_dash = true, else => return false, } } return seen_dash and seen_pipe;} pub fn isValidTable(buf: []const u8) bool { var line_count: usize = 0; var saw_separator = false; var start: usize = 0; while (start < buf.len) { const end = std.mem.indexOfScalarPos(u8, buf, start, '\n') orelse buf.len; const line = buf[start..end]; if (line_count == 1 and isSeparatorLine(line)) saw_separator = true; line_count += 1; start = end + 1; } return line_count >= 2 and saw_separator;}
const std = @import("std");
const tu = @import("text_util.zig");
pub fn codeFenceMarker(line: []const u8) ?u8 {
if (line.len < 3) return null;
const marker = line[0];
if (marker != '`' and marker != '~') return null;
if (line[1] != marker or line[2] != marker) return null;
return marker;
}
fn isCodeFence(line: []const u8) bool {
return codeFenceMarker(line) != null;
}
pub fn codeFenceLanguage(line: []const u8) []const u8 {
const info = std.mem.trim(u8, line[3..], " \t");
const end = std.mem.indexOfAny(u8, info, " \t") orelse info.len;
return info[0..end];
}
pub fn hasIndentedCodePrefix(line: []const u8) bool {
return line.len > 0 and (line[0] == '\t' or (line.len >= 4 and std.mem.eql(u8, line[0..4], " ")));
}
pub fn deindentCodeLine(line: []const u8) []const u8 {
if (line[0] == '\t') return line[1..];
return line[4..];
}
const ParsedHeader = struct {
level: usize,
content: []const u8,
};
pub fn parseHeader(line: []const u8) ?ParsedHeader {
if (line.len == 0 or line[0] != '#') return null;
var level: usize = 0;
while (level < 6 and level < line.len and line[level] == '#') : (level += 1) {}
if (level == 0 or level >= line.len) return null;
if (line[level] != ' ') return null;
return .{ .level = level, .content = line[level + 1 ..] };
}
pub fn parseSetextUnderline(line: []const u8) ?usize {
var level: ?usize = null;
for (line) |byte| {
if (byte == ' ' or byte == '\t') continue;
const next_level: usize = switch (byte) {
'=' => 1,
'-' => 2,
else => return null,
};
if (level) |existing| {
if (existing != next_level) return null;
} else {
level = next_level;
}
}
return level;
}
pub fn isSetextCandidate(line: []const u8) bool {
if (line.len == 0 or line[0] == ' ' or line[0] == '\t' or line[0] == ':') return false;
if (parseHeader(line) != null or parseBlockquote(line) != null) return false;
if (parseUnorderedList(line) != null or parseOrderedList(line) != null) return false;
return !isCodeFence(line) and
!isPipeLine(line) and
!isHorizontalRule(line) and
parseSetextUnderline(line) == null;
}
pub fn definitionMarkerBody(line: []const u8) ?[]const u8 {
if (line.len < 2 or line[0] != ':') return null;
var body_start: usize = 1;
while (body_start < line.len and (line[body_start] == ' ' or line[body_start] == '\t')) : (body_start += 1) {}
if (body_start == 1 or body_start == line.len) return null;
return line[body_start..];
}
pub const ParsedFootnoteDefinition = struct {
label: []const u8,
body: []const u8,
};
pub fn parseFootnoteDefinition(line: []const u8) ?ParsedFootnoteDefinition {
if (line.len < 6 or line[0] != '[' or line[1] != '^') return null;
const close = std.mem.indexOfScalarPos(u8, line, 2, ']') orelse return null;
if (close == 2 or close + 1 >= line.len or line[close + 1] != ':') return null;
var body_start = close + 2;
while (body_start < line.len and (line[body_start] == ' ' or line[body_start] == '\t')) : (body_start += 1) {}
if (body_start == line.len) return null;
return .{ .label = line[2..close], .body = line[body_start..] };
}
pub fn footnoteContinuationBody(line: []const u8) ?[]const u8 {
if (line.len > 0 and line[0] == '\t') return line[1..];
if (line.len >= 2 and line[0] == ' ' and line[1] == ' ') return line[2..];
return null;
}
const ParsedBlockquote = struct {
indent: []const u8,
depth: usize,
content: []const u8,
};
pub const BlockquotePrefix = struct {
indent: usize,
depth: usize,
};
pub fn parseBlockquote(line: []const u8) ?ParsedBlockquote {
var i: usize = 0;
while (i < line.len and line[i] == ' ') : (i += 1) {}
const indent_end = i;
if (i == line.len or line[i] != '>') return null;
i += 1;
if (i == line.len) return .{ .indent = line[0..indent_end], .depth = 1, .content = line[i..] };
if (line[i] != ' ') return null;
i += 1;
var depth: usize = 1;
while (i < line.len and line[i] == '>') {
const after_marker = i + 1;
if (after_marker < line.len and line[after_marker] != ' ') break;
depth += 1;
i = after_marker;
if (i == line.len) break;
i += 1;
}
return .{ .indent = line[0..indent_end], .depth = depth, .content = line[i..] };
}
pub fn isBlockquoteParagraph(line: []const u8) bool {
return isLazyBlockquoteContinuation(line);
}
pub fn isLazyBlockquoteContinuation(line: []const u8) bool {
if (std.mem.trim(u8, line, " \t").len == 0) return false;
if (parseBlockquote(line) != null or parseHeader(line) != null) return false;
if (parseUnorderedList(line) != null or parseOrderedList(line) != null) return false;
return codeFenceMarker(tu.leftTrim(line)) == null and
!isPipeLine(line) and
!isHorizontalRule(line);
}
const ParsedUnorderedList = struct {
indent: []const u8,
content: []const u8,
};
pub fn parseUnorderedList(line: []const u8) ?ParsedUnorderedList {
var i: usize = 0;
while (i < line.len and (line[i] == ' ' or line[i] == '\t')) : (i += 1) {}
if (i + 1 >= line.len) return null;
if (line[i] != '-' and line[i] != '*') return null;
if (line[i + 1] != ' ') return null;
return .{ .indent = line[0..i], .content = line[i + 2 ..] };
}
const ParsedOrderedList = struct {
indent: []const u8,
marker: []const u8,
content: []const u8,
};
pub fn parseOrderedList(line: []const u8) ?ParsedOrderedList {
var i: usize = 0;
while (i < line.len and (line[i] == ' ' or line[i] == '\t')) : (i += 1) {}
const indent_end = i;
while (i < line.len and line[i] >= '0' and line[i] <= '9') : (i += 1) {}
if (i == indent_end) return null;
if (i + 1 >= line.len) return null;
if (line[i] != '.') return null;
if (line[i + 1] != ' ') return null;
return .{
.indent = line[0..indent_end],
.marker = line[indent_end .. i + 1],
.content = line[i + 2 ..],
};
}
pub const ParsedTaskListItem = struct {
completed: bool,
has_separator: bool,
content: []const u8,
};
pub fn parseTaskListItem(content: []const u8) ?ParsedTaskListItem {
if (content.len < 3 or content[0] != '[' or content[2] != ']') return null;
const completed = switch (content[1]) {
' ' => false,
'x', 'X' => true,
else => return null,
};
if (content.len == 3) {
return .{ .completed = completed, .has_separator = false, .content = content[3..] };
}
if (content[3] != ' ') return null;
return .{ .completed = completed, .has_separator = true, .content = content[4..] };
}
pub fn isHorizontalRule(line: []const u8) bool {
const trimmed = tu.leftTrim(line);
if (trimmed.len < 3) return false;
const rule_char = trimmed[0];
if (rule_char != '-' and rule_char != '*' and rule_char != '_') return false;
var count: usize = 0;
for (trimmed) |c| {
if (c == rule_char) {
count += 1;
} else if (c != ' ' and c != '\t') {
return false;
}
}
return count >= 3;
}
pub fn isPipeLine(line: []const u8) bool {
const trimmed = tu.leftTrim(line);
if (trimmed.len == 0) return false;
for (trimmed, 0..) |byte, index| {
if (byte == '|' and !tu.isEscapedPunctuationAt(trimmed, index)) return true;
}
return false;
}
fn isSeparatorLine(line: []const u8) bool {
const trimmed = tu.leftTrim(line);
if (trimmed.len == 0) return false;
var seen_dash = false;
var seen_pipe = false;
for (trimmed) |c| {
switch (c) {
'|' => seen_pipe = true,
':', ' ', '\t' => {},
'-' => seen_dash = true,
else => return false,
}
}
return seen_dash and seen_pipe;
}
pub fn isValidTable(buf: []const u8) bool {
var line_count: usize = 0;
var saw_separator = false;
var start: usize = 0;
while (start < buf.len) {
const end = std.mem.indexOfScalarPos(u8, buf, start, '\n') orelse buf.len;
const line = buf[start..end];
if (line_count == 1 and isSeparatorLine(line)) saw_separator = true;
line_count += 1;
start = end + 1;
}
return line_count >= 2 and saw_separator;
}