It is delphi and object pascal bindings and wrapper around MyHTML library. MyHTML is a fast HTML 5 Parser using Threads.
Library is tested for
- Embarcadero (R) Delphi 10.3 on Windows 7 Service Pack 1 (Version 6.1, Build 7601, 64-bit Edition)
- FreePascal Compiler (3.2.0) and Lazarus IDE (2.0.10) on Ubuntu Linux 5.8.0-33-generic x86_64
Get the sources and add the source directory to the project search path. For FPC add the source directory to the fpc.cfg file.
Clone the repository git clone https://github.com/isemenkov/libpasmyhtml.
Add the unit you want to use to the uses clause.
A testing framework consists of the following ingredients:
- Test runner project located in
unit-testsdirectory. - Test cases (DUnit for Delphi and FPCUnit for FPC based) for all containers classes.
libpasmyhtml.pas file contains the MyHTML translated headers to use this library in pascal programs.
uses
libpasmyhtml, utils.api.cstring;
const
HTMLDocument = '<!DOCTYPE html>' + sLineBreak +
'<html>' + sLineBreak +
'<head>' + sLineBreak +
'<meta charset="utf-8" />' + sLineBreak +
'<!--[if lt IE 9]><script src="https://cdnjs.cloudflare.com'+
'/ajax/libs/html5shiv/3.7.3/html5shiv.min.js"></script>' +
'<![endif]-->' + sLineBreak +
'<title>Document Title</title>' + sLineBreak +
'<meta name="keywords" content="some_keywords keywords" />' + sLineBreak +
'<meta name="description" content="description" />' + sLineBreak +
'<link href="style.css" rel="stylesheet">' + sLineBreak +
'</head>' + sLineBreak +
'<body>' + sLineBreak +
'</body>' + sLineBreak +
'</html>';
var
Node : pmyhtml_tree_node_t;
Title : string;
Error : mystatus_t;
HTML : pmyhtml_t;
Tree : pmyhtml_tree_t;
Encoding : myencoding_t;
function FindNextNodeById (ANode : pmyhtml_tree_node_t; AId : myhtml_tags_t) : pmyhtml_tree_node_t;
inline;
begin
while (ANode <> nil) and (myhtml_node_tag_id(ANode) <> myhtml_tag_id_t(AId)) do
begin
ANode := myhtml_node_next(ANode);
end;
Result := ANode;
end;
function NodeTextValue (ANode : pmyhtml_tree_node_t) : string; inline;
var
TextNode : pmyhtml_tree_node_t;
begin
if ANode <> nil then
TextNode := myhtml_node_child(ANode);
if (TextNode <> nil) and (myhtml_tags_t(myhtml_node_tag_t(TextNode)) = MyHTML_TAG__TEXT) then
begin
Result := API.CString.Create(myhtml_node_text(TextNode, nil)).ToString;
end else
Result := '';
end else
Result := '';
end;
begin
HTML := myhtml_create;
myhtml_init(HTML, MyHTML_OPTIONS_PARSE_MODE_SEPARATELY, 1, 4096);
Tree := myhtml_tree_create;
myhtml_tree_init(Tree, HTML);
myhtml_tree_parse_flags_set(Tree, MyHTML_TREE_PARSE_FLAGS_CLEAN);
Error := myhtml_parse(Tree, MyENCODING_UTF_8,
API.CString.Create(HTMLDocument).ToPAnsiChar, Length(HTMLDocument));
if Error = mystatus_t(MyHTML_STATUS_OK) then
begin
Node := myhtml_tree_get_node_head(Tree);
if Node <> nil then
begin
Node := myhtml_node_child(Node);
if Node <> nil then
begin
Node := FindNextNodeById(Node, MyHTML_TAG_TITLE);
if Node <> nil then
begin
Title := NodeTextValue(Node);
end;
end;
end;
end;
myhtml_tree_clean(Tree);
myhtml_clean(HTML);
myhtml_tree_destroy(Tree);
myhtml_destroy(HTML);
end;
pasmyhtml.pas file contains the MyHTML object wrapper.
uses
pasmyhtml;
const
HTMLDocument = '<!DOCTYPE html>' + sLineBreak +
'<html>' + sLineBreak +
'<head>' + sLineBreak +
'<meta charset="utf-8" />' + sLineBreak +
'<!--[if lt IE 9]><script src="https://cdnjs.cloudflare.com'+
'/ajax/libs/html5shiv/3.7.3/html5shiv.min.js"></script>' +
'<![endif]-->' + sLineBreak +
'<title>Document Title</title>' + sLineBreak +
'<meta name="keywords" content="some_keywords keywords" />' + sLineBreak +
'<meta name="description" content="description" />' + sLineBreak +
'<link href="style.css" rel="stylesheet">' + sLineBreak +
'</head>' + sLineBreak +
'<body>' + sLineBreak +
'</body>' + sLineBreak +
'</html>';
var
Parser : TParser;
Node : TParser.TTagNode;
Value : string;
begin
Parser := TParser.Create(MyHTML_OPTIONS_PARSE_MODE_SEPARATELY, MyENCODE_UTF_8, 1, 4096,
MyHTML_TREE_PARSE_FLAGS_CLEAN);
Node := Parser.Parse(HTMLDocument, DOCUMENT_HEAD);
Node := Node.FirstChildrenNode(TParser.TFilter.Create.Tag(MyHTML_TAG_TITLE));
if Node.IsOk then
begin
Value := Node.Value;
end;
end;
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