261 lines
8.8 KiB
V
261 lines
8.8 KiB
V
module html
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import os
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import strings
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struct LexicalAttributes {
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mut:
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current_tag &Tag
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open_tag bool
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open_code bool
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open_string int
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open_comment bool
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is_attribute bool
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opened_code_type string
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line_count int
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lexeme_builder strings.Builder = strings.Builder{}
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code_tags map[string]bool = map{
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'script': true
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'style': true
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}
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}
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// Parser is responsible for reading the HTML strings and converting them into a `DocumentObjectModel`.
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pub struct Parser {
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mut:
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dom DocumentObjectModel
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lexical_attributes LexicalAttributes = LexicalAttributes{
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current_tag: &Tag{}
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}
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filename string = 'direct-parse'
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initialized bool
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tags []&Tag
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debug_file os.File
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}
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// This function is used to add a tag for the parser ignore it's content.
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// For example, if you have an html or XML with a custom tag, like `<script>`, using this function,
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// like `add_code_tag('script')` will make all `script` tags content be jumped,
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// so you still have its content, but will not confuse the parser with it's `>` or `<`.
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pub fn (mut parser Parser) add_code_tag(name string) {
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if name.len <= 0 {
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return
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}
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parser.lexical_attributes.code_tags[name] = true
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}
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[inline]
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fn (parser Parser) builder_str() string {
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return parser.lexical_attributes.lexeme_builder.after(0)
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}
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[if debug]
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fn (mut parser Parser) print_debug(data string) {
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$if debug {
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if data.len > 0 {
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parser.debug_file.writeln(data) or { panic(err) }
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}
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}
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}
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fn (mut parser Parser) verify_end_comment(remove bool) bool {
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lexeme := parser.builder_str()
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last := lexeme[lexeme.len - 1]
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penultimate := lexeme[lexeme.len - 2]
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is_end_comment := last == `-` && penultimate == `-`
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if is_end_comment && remove {
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parser.lexical_attributes.lexeme_builder.go_back(2)
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}
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return is_end_comment
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}
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fn blank_string(data string) bool {
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mut count := 0
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for chr in data {
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if chr == 9 || chr == 32 {
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count++
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}
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}
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return count == data.len
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}
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// init initializes the parser.
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fn (mut parser Parser) init() {
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if parser.initialized {
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return
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}
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parser.dom = DocumentObjectModel{
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debug_file: parser.debug_file
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root: &Tag{}
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}
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parser.add_code_tag('')
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parser.tags = []&Tag{}
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parser.dom.close_tags['/!document'] = true
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parser.lexical_attributes.current_tag = &Tag{}
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parser.initialized = true
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}
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fn (mut parser Parser) generate_tag() {
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if parser.lexical_attributes.open_tag {
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return
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}
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if parser.lexical_attributes.current_tag.name.len > 0
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|| parser.lexical_attributes.current_tag.content.len > 0 {
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parser.tags << parser.lexical_attributes.current_tag
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}
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parser.lexical_attributes.current_tag = &Tag{}
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}
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// split_parse parses the HTML fragment
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pub fn (mut parser Parser) split_parse(data string) {
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parser.init()
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for chr in data {
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// returns true if byte is a " or '
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is_quote := chr == `"` || chr == `\'`
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string_code := match chr {
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`"` { 1 } // "
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`\'` { 2 } // '
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else { 0 }
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}
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if parser.lexical_attributes.open_code { // here will verify all needed to know if open_code finishes and string in code
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parser.lexical_attributes.lexeme_builder.write_b(chr)
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if parser.lexical_attributes.open_string > 0
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&& parser.lexical_attributes.open_string == string_code {
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parser.lexical_attributes.open_string = 0
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} else if is_quote {
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parser.lexical_attributes.open_string = string_code
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} else if chr == `>` { // only execute verification if is a > // here will verify < to know if code tag is finished
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name_close_tag := '</$parser.lexical_attributes.opened_code_type>'
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if parser.builder_str().to_lower().ends_with(name_close_tag) {
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parser.lexical_attributes.open_code = false
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// need to modify lexeme_builder to add script text as a content in next loop (not gave error in dom)
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parser.lexical_attributes.lexeme_builder.go_back(name_close_tag.len)
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parser.lexical_attributes.current_tag.closed = true
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parser.lexical_attributes.current_tag.close_type = .new_tag
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}
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}
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} else if parser.lexical_attributes.open_comment {
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if chr == `>` && parser.verify_end_comment(false) { // close tag '>'
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// parser.print_debug(parser.builder_str() + " >> " + parser.lexical_attributes.line_count.str())
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parser.lexical_attributes.lexeme_builder.go_back_to(0)
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parser.lexical_attributes.open_comment = false
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parser.lexical_attributes.open_tag = false
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} else {
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parser.lexical_attributes.lexeme_builder.write_b(chr)
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}
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} else if parser.lexical_attributes.open_string > 0 {
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if parser.lexical_attributes.open_string == string_code {
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parser.lexical_attributes.open_string = 0
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parser.lexical_attributes.lexeme_builder.write_b(chr)
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temp_lexeme := parser.builder_str()
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if parser.lexical_attributes.current_tag.last_attribute != '' {
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lattr := parser.lexical_attributes.current_tag.last_attribute
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nval := temp_lexeme.substr(1, temp_lexeme.len - 1)
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// parser.print_debug(lattr + " = " + temp_lexeme)
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parser.lexical_attributes.current_tag.attributes[lattr] = nval
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parser.lexical_attributes.current_tag.last_attribute = ''
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} else {
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parser.lexical_attributes.current_tag.attributes[temp_lexeme.to_lower()] = '' // parser.print_debug(temp_lexeme)
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}
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parser.lexical_attributes.lexeme_builder.go_back_to(0)
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} else {
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parser.lexical_attributes.lexeme_builder.write_b(chr)
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}
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} else if parser.lexical_attributes.open_tag {
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if parser.lexical_attributes.lexeme_builder.len == 0 && is_quote {
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parser.lexical_attributes.open_string = string_code
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parser.lexical_attributes.lexeme_builder.write_b(chr)
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} else if chr == `>` { // close tag >
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complete_lexeme := parser.builder_str().to_lower()
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parser.lexical_attributes.current_tag.closed = (complete_lexeme.len > 0
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&& complete_lexeme[complete_lexeme.len - 1] == `/`) // if equals to /
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if complete_lexeme.len > 0 && complete_lexeme[0] == `/` {
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parser.dom.close_tags[complete_lexeme] = true
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}
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/*
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else if complete_lexeme.len > 0 && complete_lexeme[complete_lexeme.len - 1] == 47 { // if end tag like "/>"
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parser.lexical_attributes.current_tag.closed = true
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}
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*/
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if parser.lexical_attributes.current_tag.name == '' {
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parser.lexical_attributes.current_tag.name = complete_lexeme
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} else if complete_lexeme != '/' {
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parser.lexical_attributes.current_tag.attributes[complete_lexeme] = ''
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}
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parser.lexical_attributes.open_tag = false
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parser.lexical_attributes.lexeme_builder.go_back_to(0) // if tag name is code
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if parser.lexical_attributes.current_tag.name in parser.lexical_attributes.code_tags {
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parser.lexical_attributes.open_code = true
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parser.lexical_attributes.opened_code_type = parser.lexical_attributes.current_tag.name
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}
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// parser.print_debug(parser.lexical_attributes.current_tag.name)
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} else if chr !in [byte(9), ` `, `=`, `\n`] { // Tab, space, = and \n
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parser.lexical_attributes.lexeme_builder.write_b(chr)
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} else if chr != 10 {
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complete_lexeme := parser.builder_str().to_lower()
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if parser.lexical_attributes.current_tag.name == '' {
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parser.lexical_attributes.current_tag.name = complete_lexeme
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} else {
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parser.lexical_attributes.current_tag.attributes[complete_lexeme] = ''
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parser.lexical_attributes.current_tag.last_attribute = ''
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if chr == `=` { // if was a =
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parser.lexical_attributes.current_tag.last_attribute = complete_lexeme
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}
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}
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parser.lexical_attributes.lexeme_builder.go_back_to(0)
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}
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if parser.builder_str() == '!--' {
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parser.lexical_attributes.open_comment = true
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}
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} else if chr == `<` { // open tag '<'
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temp_string := parser.builder_str()
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if parser.lexical_attributes.lexeme_builder.len >= 1 {
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if parser.lexical_attributes.current_tag.name.len > 1
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&& parser.lexical_attributes.current_tag.name[0] == 47
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&& !blank_string(temp_string) {
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parser.tags << &Tag{
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name: 'text'
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content: temp_string
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}
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} else {
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parser.lexical_attributes.current_tag.content = temp_string // verify later who has this content
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}
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}
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// parser.print_debug(parser.lexical_attributes.current_tag.str())
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parser.lexical_attributes.lexeme_builder.go_back_to(0)
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parser.generate_tag()
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parser.lexical_attributes.open_tag = true
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} else {
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parser.lexical_attributes.lexeme_builder.write_b(chr)
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}
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}
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}
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// parse_html parses the given HTML string
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pub fn (mut parser Parser) parse_html(data string) {
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parser.init()
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mut lines := data.split_into_lines()
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for line in lines {
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parser.lexical_attributes.line_count++
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parser.split_parse(line)
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}
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parser.generate_tag()
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parser.dom.debug_file = parser.debug_file
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parser.dom.construct(parser.tags)
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}
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// finalize finishes the parsing stage .
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[inline]
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pub fn (mut parser Parser) finalize() {
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parser.generate_tag()
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}
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// get_dom returns the parser's current DOM representation.
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pub fn (mut parser Parser) get_dom() DocumentObjectModel {
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if !parser.dom.constructed {
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parser.generate_tag()
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parser.dom.construct(parser.tags)
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}
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return parser.dom
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}
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