parser: make the $tmpl subparser more robust. The legacy .html mode, is now ON, only for .html template files.
Implement a .simple default mode, with *minimum* heuristcs, and only supporting expansion of @expressions, @include, @if, @else, @for, @end. The existing .html mode, with its complex state transitions for html/js/css and heuristics, is now used *only* for template files, that have the `.html` extension.pull/13215/head
Delyan Angelov
parent
f0b7e5049b
commit
40a5c5c1a0
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@ -9,12 +9,29 @@ import os
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import strings
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enum State {
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html
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simple // default - no special interpretation of tags, *at all*!
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// That is suitable for the general case of text template interpolation,
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// for example for interpolating arbitrary source code (even V source) templates.
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//
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html // default, only when the template extension is .html
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css // <style>
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js // <script>
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// span // span.{
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}
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fn (mut state State) update(line string) {
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trimmed_line := line.trim_space()
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if is_html_open_tag('style', line) {
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state = .css
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} else if trimmed_line == '</style>' {
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state = .html
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} else if is_html_open_tag('script', line) {
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state = .js
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} else if trimmed_line == '</script>' {
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state = .html
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}
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}
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const tmpl_str_end = "')\n"
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// check HTML open tag `<name attr="x" >`
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@ -79,7 +96,7 @@ pub fn (mut p Parser) compile_template_file(template_file string, fn_name string
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}
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basepath := os.dir(template_file)
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lstartlength := lines.len * 30
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tmpl_str_start := "sb_${fn_name}.write_string('"
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tmpl_str_start := "\tsb_${fn_name}.write_string('"
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mut source := strings.new_builder(1000)
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source.writeln('
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import strings
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@ -89,25 +106,24 @@ fn vweb_tmpl_${fn_name}() string {
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')
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source.write_string(tmpl_str_start)
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mut state := State.html
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//
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mut state := State.simple
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template_ext := os.file_ext(template_file)
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if template_ext.to_lower() == '.html' {
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state = .html
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}
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//
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mut in_span := false
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mut end_of_line_pos := 0
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mut start_of_line_pos := 0
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mut tline_number := -1 // keep the original line numbers, even after insert/delete ops on lines; `i` changes
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for i := 0; i < lines.len; i++ {
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line := lines[i]
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trimmed_line := line.trim_space()
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tline_number++
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start_of_line_pos = end_of_line_pos
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end_of_line_pos += line.len + 1
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if is_html_open_tag('style', line) {
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state = .css
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} else if trimmed_line == '</style>' {
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state = .html
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} else if is_html_open_tag('script', line) {
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state = .js
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} else if trimmed_line == '</script>' {
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state = .html
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if state != .simple {
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state.update(line)
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}
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$if trace_tmpl ? {
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eprintln('>>> tfile: $template_file, spos: ${start_of_line_pos:6}, epos:${end_of_line_pos:6}, fi: ${tline_number:5}, i: ${i:5}, state: ${state:10}, line: $line')
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@ -125,7 +141,9 @@ fn vweb_tmpl_${fn_name}() string {
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}
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reporter: .parser
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})
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} else if line.contains('@footer') {
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continue
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}
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if line.contains('@footer') {
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position := line.index('@footer') or { 0 }
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p.error_with_error(errors.Error{
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message: "Please use @include 'footer' instead of @footer (deprecated)"
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@ -138,6 +156,7 @@ fn vweb_tmpl_${fn_name}() string {
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}
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reporter: .parser
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})
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continue
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}
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if line.contains('@include ') {
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lines.delete(i)
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@ -179,83 +198,131 @@ fn vweb_tmpl_${fn_name}() string {
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lines.insert(i, f)
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}
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i--
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} else if line.contains('@js ') {
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pos := line.index('@js') or { continue }
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source.write_string('<script src="')
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source.write_string(line[pos + 5..line.len - 1])
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source.writeln('"></script>')
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} else if line.contains('@css ') {
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pos := line.index('@css') or { continue }
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source.write_string('<link href="')
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source.write_string(line[pos + 6..line.len - 1])
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source.writeln('" rel="stylesheet" type="text/css">')
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} else if line.contains('@if ') {
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continue
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}
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if line.contains('@if ') {
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source.writeln(parser.tmpl_str_end)
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pos := line.index('@if') or { continue }
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source.writeln('if ' + line[pos + 4..] + '{')
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source.writeln(tmpl_str_start)
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} else if line.contains('@end') {
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continue
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}
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if line.contains('@end') {
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// Remove new line byte
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source.go_back(1)
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source.writeln(parser.tmpl_str_end)
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source.writeln('}')
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source.writeln(tmpl_str_start)
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} else if line.contains('@else') {
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continue
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}
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if line.contains('@else') {
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// Remove new line byte
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source.go_back(1)
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source.writeln(parser.tmpl_str_end)
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source.writeln(' } else { ')
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source.writeln(tmpl_str_start)
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} else if line.contains('@for') {
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continue
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}
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if line.contains('@for') {
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source.writeln(parser.tmpl_str_end)
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pos := line.index('@for') or { continue }
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source.writeln('for ' + line[pos + 4..] + '{')
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source.writeln(tmpl_str_start)
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} else if state == .html && line.starts_with('span.') && line.ends_with('{') {
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// `span.header {` => `<span class='header'>`
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class := line.find_between('span.', '{').trim_space()
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source.writeln('<span class="$class">')
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in_span = true
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} else if state == .html && line.trim_space().starts_with('.') && line.ends_with('{') {
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// `.header {` => `<div class='header'>`
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class := line.find_between('.', '{').trim_space()
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trimmed := line.trim_space()
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source.write_string(strings.repeat(`\t`, line.len - trimmed.len)) // add the necessary indent to keep <div><div><div> code clean
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source.writeln('<div class="$class">')
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} else if state == .html && line.starts_with('#') && line.ends_with('{') {
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// `#header {` => `<div id='header'>`
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class := line.find_between('#', '{').trim_space()
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source.writeln('<div id="$class">')
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} else if state == .html && line.trim_space() == '}' {
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trimmed := line.trim_space()
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source.write_string(strings.repeat(`\t`, line.len - trimmed.len)) // add the necessary indent to keep <div><div><div> code clean
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if in_span {
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source.writeln('</span>')
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in_span = false
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} else {
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source.writeln('</div>')
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}
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} else if state == .js {
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if line.contains('//V_TEMPLATE') {
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source.writeln(insert_template_code(fn_name, tmpl_str_start, line))
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} else {
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// replace `$` to `\$` at first to escape JavaScript template literal syntax
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source.writeln(line.replace(r'$', r'\$').replace(r'$$', r'@').replace(r'.$',
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r'.@').replace(r"'", r"\'"))
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}
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} else if state == .css {
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// disable template variable declaration in inline stylesheet
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// because of some CSS rules prefixed with `@`.
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source.writeln(line.replace(r'.$', r'.@').replace(r"'", r"\'"))
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} else {
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source.writeln(insert_template_code(fn_name, tmpl_str_start, line))
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continue
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}
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if state == .simple {
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// by default, just copy 1:1
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source.writeln(insert_template_code(fn_name, tmpl_str_start, line))
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continue
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}
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// The .simple mode ends here. The rest handles .html/.css/.js state transitions.
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if state != .simple {
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if line.contains('@js ') {
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pos := line.index('@js') or { continue }
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source.write_string('<script src="')
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source.write_string(line[pos + 5..line.len - 1])
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source.writeln('"></script>')
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continue
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}
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if line.contains('@css ') {
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pos := line.index('@css') or { continue }
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source.write_string('<link href="')
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source.write_string(line[pos + 6..line.len - 1])
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source.writeln('" rel="stylesheet" type="text/css">')
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continue
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}
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}
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match state {
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.html {
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if line.starts_with('span.') && line.ends_with('{') {
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// `span.header {` => `<span class='header'>`
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class := line.find_between('span.', '{').trim_space()
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source.writeln('<span class="$class">')
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in_span = true
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continue
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}
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if line.trim_space().starts_with('.') && line.ends_with('{') {
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// `.header {` => `<div class='header'>`
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class := line.find_between('.', '{').trim_space()
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trimmed := line.trim_space()
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source.write_string(strings.repeat(`\t`, line.len - trimmed.len)) // add the necessary indent to keep <div><div><div> code clean
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source.writeln('<div class="$class">')
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continue
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}
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if line.starts_with('#') && line.ends_with('{') {
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// `#header {` => `<div id='header'>`
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class := line.find_between('#', '{').trim_space()
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source.writeln('<div id="$class">')
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continue
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}
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if line.trim_space() == '}' {
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trimmed := line.trim_space()
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source.write_string(strings.repeat(`\t`, line.len - trimmed.len)) // add the necessary indent to keep <div><div><div> code clean
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if in_span {
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source.writeln('</span>')
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in_span = false
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} else {
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source.writeln('</div>')
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}
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continue
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}
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}
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.js {
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if line.contains('//V_TEMPLATE') {
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source.writeln(insert_template_code(fn_name, tmpl_str_start, line))
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} else {
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// replace `$` to `\$` at first to escape JavaScript template literal syntax
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source.writeln(line.replace(r'$', r'\$').replace(r'$$', r'@').replace(r'.$',
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r'.@').replace(r"'", r"\'"))
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}
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continue
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}
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.css {
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// disable template variable declaration in inline stylesheet
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// because of some CSS rules prefixed with `@`.
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source.writeln(line.replace(r'.$', r'.@').replace(r"'", r"\'"))
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continue
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}
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else {}
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}
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// by default, just copy 1:1
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source.writeln(insert_template_code(fn_name, tmpl_str_start, line))
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}
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source.writeln(parser.tmpl_str_end)
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source.writeln('_tmpl_res_$fn_name := sb_${fn_name}.str() ')
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source.writeln('return _tmpl_res_$fn_name')
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source.writeln('\t_tmpl_res_$fn_name := sb_${fn_name}.str() ')
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source.writeln('\treturn _tmpl_res_$fn_name')
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source.writeln('}')
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source.writeln('// === end of vweb html template ===')
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source.writeln('// === end of vweb html template_file: $template_file ===')
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result := source.str()
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$if trace_tmpl_expansion ? {
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eprintln('>>>>>>> template expanded to:')
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eprintln(result)
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eprintln('-----------------------------')
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}
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return result
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}
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@ -0,0 +1,15 @@
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module data
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//object: @object
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//object_u: @object_u
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//objects: @objects
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//objects_u: @objects_u
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pub struct @object {
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pub mut:
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id int
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name string
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description string
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tags []string
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remarks []int
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}
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@ -0,0 +1,33 @@
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module data
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//object: user
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//object_u: User
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//objects: users
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//objects_u: Users
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pub struct user {
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pub mut:
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id int
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name string
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description string
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tags []string
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remarks []int
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}
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module data
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//object: circle
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//object_u: Circle
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//objects: circles
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//objects_u: Circles
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pub struct circle {
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pub mut:
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id int
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name string
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description string
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tags []string
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remarks []int
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}
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OK
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@ -0,0 +1,18 @@
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module main
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const codepath_file = @FILE
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fn main() {
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togenerate := ["user","circle"]
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for name in togenerate{
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object := name
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object_u := name.capitalize()
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objects := name+"s"
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objects_u := name.capitalize()+"s"
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mut txt := $tmpl('data_obj.v.templ')
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txt = txt.replace("/////////// THIS IS THE TEMPLATE, THIS CAN BE MODIFIED","")
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println(txt)
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}
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println('OK')
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}
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