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MarkdownCommonMark.pas
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Unit MarkdownCommonMark;
{
Copyright (c) 2011+, Health Intersections Pty Ltd (http://www.healthintersections.com.au)
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of HL7 nor the names of its contributors may be used to
endorse or promote products derived from this software without specific
prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
}
{
How to use this - see MarkdownProcessor; this unit is not intended to be used directly
Still to do:
- link references
- follow up on a few failing tests that I don't understand - see mode : too-hard
- test under FPC
not planned to be supported
- HTML blocks
note: tests related to link references and HTML blocks run (to check that the processing doesn't blow up), but output comparison is never checked
note about GFM:
the GFM tests and the CommonMark tests disagree about proper
processing of lists indented more than 3 spaces. This is probably
just poor quality in the GFM tests, which do have a number of inconsistencies
}
interface
{$IFDEF FPC}
{$MODE DELPHI}{$H+}
{$ENDIF}
uses
SysUtils, Classes, Math, Generics.Collections, Character,
{$IFDEF FPC}
RegExpr,
UnicodeData,
{$ELSE}
System.RegularExpressions,
{$ENDIF}
MarkdownHTMLEntities,
MarkdownProcessor;
const
LENGTH_INCREMENT = 116;
EMAIL_REGEX = '^[a-zA-Z0-9.!#$%&''*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$';
TEST_STYLING = false; // set this true to check style tracking while doing unit tests (10% speed hit)
type
TCommonMarkStyle = (cmUnknown, cmText, cmEntity, cmControlChar, cmDelimiter, cmCode, cmURL, cmTableMarker, cmDel);
{$IFDEF FPC}
{ TStringBuilder }
TStringBuilder = class
private
FBuild : String;
FLength : integer;
public
procedure clear;
procedure append(c : char); overload;
procedure append(s : String); overload;
function toString : String; override;
end;
{ TRegEx }
TRegEx = class
public
class function isMatch(cnt, regex : String) : boolean;
end;
{$ENDIF}
TCMWhitespaceMode = (wsLeave, wsTrim, wsStrip);
// parser location tracking is done to support syntax highlighting. The parser won't report any errors from the markdown
TLocation = record
line : integer;
col : integer;
end;
// Abstract Syntax Tree
// inlines
TCMTextNode = class
private
FName: String;
FAttrs: TDictionary<String, String>;
FContent : String;
FBuild : String;
FLength : integer;
FOpener, FCloser : boolean;
FActive: boolean;
FPos : TLocation; // start offset in this text
// Start : Integer;
function GetAttrs: TDictionary<String, String>;
function renderAttrs : String;
procedure render(b : TStringBuilder);
function getText : String;
procedure SetName(const Value: String);
procedure SetActive(const Value: boolean);
public
constructor Create(loc : TLocation);
destructor Destroy; override;
property name : String read FName write SetName; // '' means just a test node
property attrs : TDictionary<String,String> read GetAttrs;
property opener : boolean read FOpener write FOpener;
property closer : boolean read FCloser write FCloser;
property active : boolean read FActive write SetActive;
procedure addText(ch : char); overload;
procedure addText(s : String); overload;
procedure removeChars(count : integer);
function isEmpty : boolean;
end;
TCMTextNodes = class (TObjectList<TCMTextNode>)
public
function addOpener(loc : TLocation; name : String) : TCMTextNode;
function addText(loc : TLocation; cnt : String) : TCMTextNode; // if the last is text and active, add to that
function addTextNode(loc : TLocation; cnt : String) : TCMTextNode; // always make a new node, and make it inactive
function addCloser(loc : TLocation; name : String) : TCMTextNode;
// image parsing
function plainTextSince(node : TCMTextNode) : String;
procedure removeAfter(node : TCMTextNode);
// emph processing
procedure addOpenerAfter(name : String; node : TCMTextNode); // line/col = 0,0
procedure addCloserBefore(name : String; node : TCMTextNode); // line/col = 0,0
end;
// blocks
TCMBlock = class abstract (TObject)
private
FClosed: boolean;
FLine : integer;
protected
procedure render(parent : TCMBlock; b : TStringBuilder); virtual; abstract;
function wsMode : TCMWhitespaceMode; virtual;
public
constructor Create(line : Integer);
property closed : boolean read FClosed write FClosed;
property line : Integer read FLine;
end;
TCMContainerBlock = class abstract (TCMBlock)
private
FBlocks: TObjectList<TCMBlock>;
protected
procedure render(parent : TCMBlock; b : TStringBuilder); override;
public
constructor Create(line : Integer);
destructor Destroy; override;
property blocks : TObjectList<TCMBlock> read FBlocks;
end;
TCommonMarkDocument = class (TCMContainerBlock);
TCMParagraphBlock = class (TCMContainerBlock)
private
FHeader: integer;
protected
procedure render(parent : TCMBlock; b : TStringBuilder); override;
public
function isPlainPara : boolean; virtual;
property header : integer read FHeader write FHeader;
end;
TCMQuoteBlock = class (TCMParagraphBlock)
protected
procedure render(parent : TCMBlock; b : TStringBuilder); override;
public
function isPlainPara : boolean; override;
end;
TCMListBlock = class (TCMContainerBlock)
private
FOrdered: boolean;
FStart: String;
FMarker: String;
FLoose: boolean;
FLastIndent: integer;
FBaseIndent: integer;
FHasSeenEmptyLine : boolean; // parser state
function grace : integer;
protected
procedure render(parent : TCMBlock; b : TStringBuilder); override;
public
property ordered : boolean read FOrdered write FOrdered;
property baseIndent : integer read FBaseIndent write FBaseIndent;
property lastIndent : integer read FLastIndent write FLastIndent;
property start : String read FStart write FStart;
property marker : String read FMarker write FMarker;
property loose : boolean read FLoose write FLoose;
end;
TCMListItemBlock = class (TCMParagraphBlock)
protected
procedure render(parent : TCMBlock; b : TStringBuilder); override;
public
function isPlainPara : boolean; override;
end;
TCMHeadingBlock = class (TCMContainerBlock)
private
FLevel: integer;
protected
procedure render(parent : TCMBlock; b : TStringBuilder); override;
public
constructor Create(line, level : Integer);
property level : integer read FLevel write FLevel;
end;
TCMCodeBlock = class (TCMContainerBlock)
private
FFenced: boolean;
FLang: String;
protected
procedure render(parent : TCMBlock; b : TStringBuilder); override;
function wsMode : TCMWhitespaceMode; override;
public
property fenced : boolean read FFenced write FFenced;
property lang : String read FLang write FLang;
end;
// contained blocks are cells
TCMTableRowBlock = class (TCMContainerBlock)
protected
procedure render(parent : TCMBlock; b : TStringBuilder); override;
end;
TTextAlign = (taLeft, taCenter, taRight);
// contained blocks are rows. The first row is the title row
TCMTableBlock = class (TCMContainerBlock)
private
FColumns: TArray<TTextAlign>;
protected
procedure render(parent : TCMBlock; b : TStringBuilder); override;
public
property columns : TArray<TTextAlign> read FColumns;
end;
TCMLeafBlock = class abstract (TCMBlock);
TCMThematicBreakBlock = class (TCMLeafBlock)
protected
procedure render(parent : TCMBlock; b : TStringBuilder); override;
end;
TCMTextBlock = class (TCMLeafBlock)
private
FText: String;
FNodes : TCMTextNodes;
protected
procedure render(parent : TCMBlock; b : TStringBuilder); override;
public
constructor Create(line : integer; text : String);
destructor Destroy; override;
property text : String read FText write FText;
end;
// Parser Infrastructure
TCommonMarkEngine = class;
TCMLine = class
private
FLine : String;
FIndex : integer;
FCursor : integer; // fCursor is the corrected character cursor, not the character offset
FMark : integer;
FStyling : boolean;
FStyles : Array of TCommonMarkStyle;
FBlockOffset : integer;
FBlockPreSpaces : integer;
procedure getOffset(position : integer; var index : integer; var preSpaces : integer);
procedure reset;
procedure markBlock(stop : integer);
procedure markStyle(stop : integer; style : TCommonMarkStyle);
procedure updateStyle(start, length : integer; style : TCommonMarkStyle);
procedure markRemainder(style : TCommonMarkStyle);
function GetStyle(index: integer): TCommonMarkStyle;
function GetStyleCount: integer;
public
constructor create(styling : boolean; line : string; index : integer);
procedure mark;
procedure rewind;
procedure advance(len : integer); // advance x number of spaces or characters
procedure skipWS; // advance from the current cursor until not pointing at whitespace
function isEmpty : boolean; // is cursor at end of string
function focus : String; // what is left after cursor
function countWS : integer; // whitespace count from cursor
function isWhitespace : boolean; // if everything after cursor is whitespace
property Styles[index : integer] : TCommonMarkStyle read GetStyle;
property StyleCount : integer read GetStyleCount;
end;
TCMBlockProcessingContext = (bpGeneral, bpCodeBlock, bpFencedCodeBlock);
TCMBlockProcessor = class abstract (TObject)
protected
FParent : TCMBlockProcessor;
// this procedure processes a line for nested blocks
// return true if the block is done.
// if false, modify the line, removing prepended characters, and remember to grab the characters as you go
function processLine(line : TCMLine; root : boolean; context : TCMBlockProcessingContext; isGFM : boolean; var isLazy : boolean) : boolean; virtual; abstract;
function isList(ordered : boolean; marker : String; indent : integer) : boolean; virtual;
function inListOrQuote : boolean; virtual;
function parser : TCommonMarkEngine; virtual;
public
constructor Create(processor : TCMBlockProcessor);
end;
// this anchors the chain
TCMDocumentProcessor = class (TCMBlockProcessor)
private
FParser : TCommonMarkEngine;
protected
function processLine(line : TCMLine; root : boolean; context : TCMBlockProcessingContext; isGFM : boolean; var isLazy : boolean) : boolean; override;
function parser : TCommonMarkEngine; override;
public
constructor Create(parser : TCommonMarkEngine);
end;
TCMQuoteProcessor = class (TCMBlockProcessor)
private
quote : TCMQuoteBlock;
protected
function processLine(line : TCMLine; root : boolean; context : TCMBlockProcessingContext; isGFM : boolean; var isLazy : boolean) : boolean; override;
function inListOrQuote : boolean; override;
public
constructor Create(processor : TCMBlockProcessor; q : TCMQuoteBlock);
end;
TCMListProcessor = class (TCMBlockProcessor)
private
FList : TCMListBlock;
FItem : TCMListItemBlock;
FHasContent : boolean;
FEmptyLine : integer;
protected
function processLine(line : TCMLine; root : boolean; context : TCMBlockProcessingContext; isGFM : boolean; var isLazy : boolean) : boolean; override;
function isList(ordered : boolean; marker : String; indent : integer) : boolean; override;
function inListOrQuote : boolean; override;
public
constructor Create(processor : TCMBlockProcessor; list : TCMListBlock; item : TCMListItemBlock);
destructor Destroy; override;
end;
TCMTextLexer = class
private
FText : String;
FCursor : integer;
FMark, FMarkCol, FMarkLine : Integer;
FBuilder : TStringBuilder;
FLine : integer;
FCol : integer;
FStartLine : integer;
FLines : TObjectList<TCMLine>;
FStyling : boolean;
function GetDone: boolean;
function GetPeek: char;
function GetPeekNext: char;
function GetPeekLast: char;
function GetPeekEndRun: char;
public
constructor Create(text : String; lines : TObjectList<TCMLine>; startline : integer; styling : boolean);
destructor Destroy; override;
procedure mark;
procedure rewind;
property done : boolean read GetDone;
property peek : char read GetPeek;
property peekNext : char read GetPeekNext;
property peekLast : char read GetPeekLast;
property peekEndRun : char read GetPeekEndRun;
function peekRun(checkBefore : boolean): String;
function peekLen(length : integer) : String;
function peekUntil(chs : TSysCharSet) : String;
function peekWhile(chs : TSysCharSet) : String;
function grab(style : TCommonMarkStyle) : char; overload;
function grabRun(style : TCommonMarkStyle) : String; overload;
function grab(style : TCommonMarkStyle; length : integer) : String; overload;
function has(s : string) : boolean;
function runExistsAfter(s : String) : boolean;
function runExistsAfterBeforeChar(s : String; c : char) : boolean;
procedure skipWS;
function location : TLocation;
end;
TCMDelimiterMode = (dmNeither, dmOpener, dmCloser, dmBoth);
TCMDelimiter = class
private
Fmode: TCMDelimiterMode;
Fdelimiter: String;
Factive: boolean;
FNode: TCMTextNode;
public
constructor Create(node : TCMTextNode; delimiter : String; mode : TCMDelimiterMode);
function isOpener : boolean;
function isCloser : boolean;
property node : TCMTextNode read FNode;
property delimiter : String read Fdelimiter write Fdelimiter;
property active : boolean read Factive write Factive;
property mode : TCMDelimiterMode read Fmode write Fmode;
function isEmph : boolean;
end;
TCommonMarkEngine = class
private
FLines : TObjectList<TCMLine>;
FCurrentLine : integer;
FBuilder : TStringBuilder;
FEntities : TDictionary<String, String>;
FStack : TObjectList<TCMDelimiter>;
FStyling : boolean;
FGFMExtensions : boolean;
// line operations
procedure parseLines(src : String);
function grabLine : TCMLine;
function peekLine : TCMLine;
procedure redoLine;
function done : boolean;
// string operations
function allCharsSame(s : String) : boolean;
function copyTo(s : String; chs : TSysCharSet) : String;
function after(s : String; chs : TSysCharSet) : String;
function copyWhile(s : String; chs : TSysCharSet) : String;
function startsWithWS(s : String; c : char; out length : integer; wsLen : integer = 3) : boolean; overload;
function startsWithWS(s : String; c : String; out length : integer; wsLen : integer = 3) : boolean; overload;
function countWS(s : String) : integer;
function lengthWSCorrected(s : String) : integer;
function removeWS(s : String; count : integer) : String;
function stripWhitespace(s : String) : String;
function htmlEscape(s : String) : String; overload;
function htmlEscape(c : char) : String; overload;
function urlEscape(s : String; ignoreExisting : boolean = false) : String; overload;
function urlEscape(c : char) : String; overload;
function parseEntityString(entity : String): String;
function isEndOfTable(line : TCMLine) : boolean;
procedure parseTableLine(t : TCMTableBlock; line : TCMLine);
// status
function inPara(blocks : TObjectList<TCMBlock>; canBeQuote : boolean) : boolean;
function inList(blocks : TObjectList<TCMBlock>; ordered : boolean; marker : String; indent : integer; grace : integer; out list : TCMListBlock) : boolean;
function isBlock(cont : TCMBlock; blocks : TObjectList<TCMBlock>; line : String; wsLen : integer = 3) : boolean;
// block parsing
function parseThematicBreak(blocks : TObjectList<TCMBlock>; line : TCMLine) : boolean;
function parseHeader(blocks : TObjectList<TCMBlock>; line : TCMLine) : boolean;
function parseCodeBlock(blocks : TObjectList<TCMBlock>; line : TCMLine; processor : TCMBlockProcessor) : boolean;
function parseFencedCodeBlock(blocks : TObjectList<TCMBlock>; line : TCMLine; processor : TCMBlockProcessor) : boolean;
function parseSeTextHeader(blocks : TObjectList<TCMBlock>; line : TCMLine; isLazy : boolean; processor : TCMBlockProcessor) : boolean;
function parseQuoteBlock(blocks : TObjectList<TCMBlock>; line : TCMLine; processor : TCMBlockProcessor) : boolean;
function parseUListBlock(blocks : TObjectList<TCMBlock>; line : TCMLine; processor : TCMBlockProcessor) : boolean;
function parseOListBlock(blocks : TObjectList<TCMBlock>; line : TCMLine; processor : TCMBlockProcessor) : boolean;
function parseTableBlock(blocks : TObjectList<TCMBlock>; line : TCMLine; processor : TCMBlockProcessor) : boolean;
procedure parse(block : TCMContainerBlock; processor : TCMBlockProcessor); overload;
// link references
procedure parseLinkReferences;
// inlines
function hasEmailAddress(lexer: TCMTextLexer; var len : integer) : boolean;
procedure parseTextEscape(lexer : TCMTextLexer; nodes: TCMTextNodes; wsMode : TCMWhitespaceMode);
procedure parseEntity(lexer : TCMTextLexer; nodes : TCMTextNodes; wsMode : TCMWhitespaceMode);
function parseEntityInner(lexer : TCMTextLexer) : String;
procedure parseBackTick(lexer : TCMTextLexer; nodes: TCMTextNodes; wsMode : TCMWhitespaceMode);
procedure parseTilde(lexer : TCMTextLexer; nodes: TCMTextNodes; wsMode : TCMWhitespaceMode);
procedure parseAutoLink(lexer : TCMTextLexer; nodes : TCMTextNodes; wsMode : TCMWhitespaceMode);
procedure parseExtendedAutoLinkWeb(lexer : TCMTextLexer; nodes : TCMTextNodes; wsMode : TCMWhitespaceMode; start, linkStart : String);
procedure parseExtendedAutoLinkEmail(lexer : TCMTextLexer; nodes : TCMTextNodes; len : integer);
procedure parseDelimiter(lexer : TCMTextLexer; nodes : TCMTextNodes; wsMode : TCMWhitespaceMode; canRun : boolean);
procedure parseCloseDelimiter(lexer : TCMTextLexer; nodes : TCMTextNodes; wsMode : TCMWhitespaceMode);
function processInlineLink(lexer : TCMTextLexer; nodes : TCMTextNodes; del : TCMDelimiter) : boolean;
procedure parseTextCore(lexer : TCMTextLexer; nodes : TCMTextNodes; wsMode : TCMWhitespaceMode);
procedure parseText(lexer : TCMTextLexer; nodes : TCMTextNodes; wsMode : TCMWhitespaceMode);
function processText(text : String; wsMode : TCMWhitespaceMode; startLine : integer) : TCMTextNodes;
procedure parseInline(blocks : TObjectList<TCMBlock>; line : String);
procedure processInlines(block : TCMBlock; wsMode : TCMWhitespaceMode);
procedure processEmphasis(nodes : TCMTextNodes; stopDel : TCMDelimiter);
procedure checkLines;
public
Constructor Create;
Destructor Destroy; override;
property GFMExtensions : boolean read FGFMExtensions write FGFMExtensions;
class function process(src : String; gfm : boolean) : String;
// divided into 2 steps in case some consumer wants to process the syntax tree
class function parse(src : String; gfm : boolean) : TCommonMarkDocument; overload;
class function parseStyles(src : String; gfm : boolean) : TObjectList<TCMLine>; overload;
class function render(doc : TCommonMarkDocument) : String;
end;
TCommonMarkProcessor = class (TMarkdownProcessor)
protected
function GetUnSafe: boolean; override;
procedure SetUnSafe(const value: boolean); override;
public
function process(source : String) : String; override; // want to process the syntax tree? Use the TCommonMarkEngine Directly
end;
implementation
function null_loc : TLocation;
begin
result.line := 0;
result.col := 0;
end;
procedure debug(s : String);
begin
// writeln(s);
end;
function isWhitespaceChar(ch: char): boolean;
begin
result := CharInSet(ch, [#10, #9, ' ']);
end;
function isWhitespace(s: String): boolean;
var
ch : char;
begin
result := true;
for ch in s do
if not isWhitespaceChar(ch) then
exit(false);
end;
function isEscapable(ch : char) : boolean;
begin
result := CharInSet(ch, ['!', '"', '#', '$', '%', '&', '''', '(', ')', '*', '+', ',', '-', '.', '/', ':', ';', '<', '=', '>', '?',
'@', '[', '\', ']', '^', '_', '`', '{', '|', '}', '~']);
end;
function isUnicodePunctuation(ch : char) : boolean;
{$IFDEF FPC}
var
NType: byte;
{$ENDIF}
begin
{$IFDEF FPC}
case ch of
'0'..'9',
'a'..'z',
'A'..'Z',
'_': exit(false);
end;
if Ord(ch)<128 then
Result:= true
else if Ord(ch) >= LOW_SURROGATE_BEGIN then
exit(true)
else
begin
NType:= GetProps(Ord(ch))^.Category;
Result := not (NType<=UGC_OtherNumber);
end;
{$ELSE}
result := (ch.GetUnicodeCategory in [TUnicodeCategory.ucConnectPunctuation, TUnicodeCategory.ucDashPunctuation, TUnicodeCategory.ucClosePunctuation,
TUnicodeCategory.ucFinalPunctuation, TUnicodeCategory.ucInitialPunctuation, TUnicodeCategory.ucOtherPunctuation, TUnicodeCategory.ucOpenPunctuation, TUnicodeCategory.ucMathSymbol]);
{$ENDIF}
end;
{$IFDEF FPC}
{ TRegEx }
class function TRegEx.isMatch(cnt, regex: String): boolean;
var
r : TRegExpr;
begin
r := TRegExpr.create(regex);
try
result := r.exec(cnt);
finally
r.free;
end;
end;
{ TStringBuilder }
procedure TStringBuilder.clear;
begin
FLength := 0;
end;
procedure TStringBuilder.append(c: char);
begin
if FLength+1 > FBuild.Length then
setLength(FBuild, FBuild.Length+LENGTH_INCREMENT);
inc(FLength);
FBuild[FLength] := c;
end;
procedure TStringBuilder.append(s: String);
var
i : integer;
begin
if FLength+length(s) > FBuild.Length then
setLength(FBuild, FBuild.Length+length(s)+LENGTH_INCREMENT);
for i := 1 to length(s) do
FBuild[FLength+i] := s[i];
inc(FLength, length(s));
end;
function TStringBuilder.toString: String;
begin
result := Copy(FBuild, 1, FLength);
end;
{$ENDIF}
{ TCMTextNode }
procedure TCMTextNode.addText(s: String);
var
ch : char;
begin
for ch in s do
addText(ch);
end;
constructor TCMTextNode.Create;
begin
inherited Create;
FActive := true;
FPos := loc;
end;
procedure TCMTextNode.addText(ch: char);
begin
if FLength+1 > FBuild.Length then
setLength(FBuild, FBuild.Length+LENGTH_INCREMENT);
inc(FLength);
FBuild[FLength] := ch;
end;
destructor TCMTextNode.Destroy;
begin
FAttrs.Free;
inherited;
end;
function TCMTextNode.GetAttrs: TDictionary<String, String>;
begin
if FAttrs = nil then
FAttrs := TDictionary<String, String>.create;
result := FAttrs;
end;
function TCMTextNode.getText: String;
begin
Active := false;
result := FContent;
end;
function TCMTextNode.isEmpty: boolean;
begin
result := FContent = '';
end;
procedure TCMTextNode.removeChars(count : integer);
begin
active := false;
delete(FContent, 1, count);
end;
procedure TCMTextNode.render(b: TStringBuilder);
begin
if FOpener then
begin
b.Append('<');
b.Append(FName);
b.Append(renderAttrs);
if FCloser then
b.Append(' />')
else
b.Append('>');
end
else if FCloser then
begin
b.Append('</');
b.Append(FName);
b.Append('>');
end
else
begin
active := false;
b.Append(Copy(FContent, 1, FLength));
end;
end;
function TCMTextNode.renderAttrs: String;
var
s : String;
begin
result := '';
if FAttrs <> nil then
begin
// arbitrary order to pass the standard tests
if FAttrs.TryGetValue('src', s) then
result := result + ' src="'+s+'"';
if FAttrs.TryGetValue('alt', s) then
result := result + ' alt="'+s+'"';
if FAttrs.TryGetValue('href', s) then
result := result + ' href="'+s+'"';
if FAttrs.TryGetValue('title', s) then
result := result + ' title="'+s+'"';
for s in FAttrs.Keys do
if (s <> 'src') and (s <> 'alt') and (s <> 'href') and (s <> 'title') then
result := result + ' '+s+'="'+FAttrs[s]+'"';
end;
end;
procedure TCMTextNode.SetActive(const Value: boolean);
begin
if active <> Value then
begin
Factive := value;
if not active then
FContent := Copy(FBuild, 1, FLength);
end;
end;
procedure TCMTextNode.SetName(const Value: String);
begin
FContent := '';
FLength := 0;
FName := Value;
active := false;
end;
{ TCMTextNodes }
function TCMTextNodes.addCloser(loc : TLocation; name: String): TCMTextNode;
begin
if count > 0 then
last.active := false;
result := TCMTextNode.Create(loc);
add(result);
result.name := name;
result.closer := true;
end;
procedure TCMTextNodes.addCloserBefore(name: String; node: TCMTextNode);
var
n : TCMTextNode;
begin
n := TCMTextNode.Create(null_loc);
insert(IndexOf(node), n);
n.name := name;
n.closer := true;
end;
function TCMTextNodes.addOpener(loc : TLocation; name: String): TCMTextNode;
begin
if count > 0 then
last.active := false;
result := TCMTextNode.Create(loc);
add(result);
result.name := name;
result.opener := true;
end;
procedure TCMTextNodes.addOpenerAfter(name: String; node: TCMTextNode);
var
n : TCMTextNode;
begin
n := TCMTextNode.Create(null_loc);
Insert(IndexOf(node)+1, n);
n.name := name;
n.opener := true;
end;
function TCMTextNodes.addText(loc : TLocation; cnt: String): TCMTextNode;
begin
if (count = 0) or (not last.active or last.opener or last.closer) then
begin
result := TCMTextNode.Create(loc);
add(result);
end
else
result := last;
result.addText(cnt);
end;
function TCMTextNodes.addTextNode(loc : TLocation; cnt: String): TCMTextNode;
begin
if count > 0 then
last.active := false;
result := TCMTextNode.Create(loc);
add(result);
result.addText(cnt);
result.active := false;
end;
function TCMTextNodes.plainTextSince(node: TCMTextNode): String;
var
i : integer;
begin
result := '';
for i := IndexOf(node)+1 to count - 1 do
if Items[i].name = 'img' then
result := result + Items[i].attrs['alt']
else
result := result + Items[i].getText;
end;
procedure TCMTextNodes.removeAfter(node: TCMTextNode);
var
i : integer;
ndx : integer;
begin
ndx := indexOf(node);
for i := count - 1 downto ndx + 1 do
Delete(i);
end;
{ TCMBlock }
constructor TCMBlock.Create(line: Integer);
begin
Inherited Create;
FLine := line;
end;
function TCMBlock.wsMode: TCMWhitespaceMode;
begin
result := wsTrim;
end;
{ TCMContainerBlock }
constructor TCMContainerBlock.Create;
begin
inherited create(line);
FBlocks := TObjectList<TCMBlock>.create(true);
end;
destructor TCMContainerBlock.Destroy;
begin
FBlocks.Free;
inherited Destroy;
end;
procedure TCMContainerBlock.render(parent : TCMBlock; b: TStringBuilder);
var
c : TCMBlock;
begin
for c in FBlocks do
c.render(self, b);
end;
{ TCMParagraphBlock }
function TCMParagraphBlock.isPlainPara: boolean;
begin
result := FHeader = 0;
end;
procedure TCMParagraphBlock.render(parent : TCMBlock; b: TStringBuilder);
var
c : TCMBlock;
first : boolean;
begin
case header of
0: b.Append('<p>');
1: b.Append('<h1>');
2: b.Append('<h2>');
end;
first := true;
for c in FBlocks do
begin
if first then
first := false
else
b.Append(#10);
c.render(self, b);
end;
case header of
0: b.Append('</p>');
1: b.Append('</h1>');
2: b.Append('</h2>');
end;
b.Append(#10);
end;
{ TCMQuoteBlock }
function TCMQuoteBlock.isPlainPara: boolean;
begin
result := false;
end;
procedure TCMQuoteBlock.render(parent : TCMBlock; b: TStringBuilder);
var
c : TCMBlock;
begin
b.Append('<blockquote>'#10);
for c in FBlocks do
c.render(self, b);
b.Append('</blockquote>'#10);
end;
{ TCMListBlock }
function TCMListBlock.grace: integer;
begin
if ordered then
result := 2
else
result := 1;
end;
procedure TCMListBlock.render(parent : TCMBlock; b: TStringBuilder);
var
c : TCMBlock;
begin
if not ordered then
b.Append('<ul>'#10)
else if start = '1' then
b.Append('<ol>'#10)
else
b.Append('<ol start="'+start+'">'#10);
for c in FBlocks do
c.render(self, b);
if ordered then
b.Append('</ol>'#10)
else
b.Append('</ul>'#10);
end;
{ TCMListItemBlock }
function TCMListItemBlock.isPlainPara: boolean;
begin
result := false;
end;
procedure TCMListItemBlock.render(parent : TCMBlock; b: TStringBuilder);
var
c, cp : TCMBlock;
first, rFirst : boolean;
begin
if Blocks.Count = 0 then
b.Append('<li>')
else
begin
b.Append('<li>');
rFirst := true;
for c in FBlocks do
if (c is TCMParagraphBlock) and (c as TCMParagraphBlock).isPlainPara and not (parent as TCMListBlock).loose then
begin
first := true;
for cp in (c as TCMParagraphBlock).Blocks do
begin
if first then
first := false
else
b.Append(#10);
cp.render(self, b);
end;