v/vlib/vweb/tmpl/tmpl.v

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// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module tmpl
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import os
import strings
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const (
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str_start = "sb.write(\'"
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str_end = "\' ) "
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)
// compile_file compiles the content of a file by the given path as a template
pub fn compile_file(path, fn_name string) string {
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mut html := os.read_file(path) or {
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panic('html failed')
}
return compile_template(html, fn_name)
}
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enum State {
html
css // <style>
js // <script>
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//span // span.{
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}
pub fn compile_template(content, fn_name string) string {
// lines := os.read_lines(path)
mut html := content
lines := html.split_into_lines()
mut s := strings.new_builder(1000)
// base := path.all_after_last('/').replace('.html', '')
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s.writeln("
import strings
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// === vweb html template ===
fn vweb_tmpl_${fn_name}() {
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mut sb := strings.new_builder(${lines.len * 30})\n")
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s.writeln(str_start)
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mut state := State.html
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mut in_span := false
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for _line in lines {
line := _line.trim_space()
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if line == '<style>' {
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state = .css
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} else if line == '</style>' {
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state = .html
}
else if line == '<script>' {
state = .js
}
else if line == '</script>' {
state = .html
}
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if line.contains('@include ') {
pos := line.index('@include ') or {
continue
}
mut file_name := line[pos + 9..]
file_path := os.join_path('templates', '${file_name}.html')
mut file_content := os.read_file(file_path) or {
panic('reading file $file_name failed')
}
file_content = file_content.replace("\'", '"')
s.writeln(file_content)
} else if line.contains('@if ') {
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s.writeln(str_end)
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pos := line.index('@if') or {
continue
}
s.writeln('if ' + line[pos + 4..] + '{')
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s.writeln(str_start)
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} else if line.contains('@end') {
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s.writeln(str_end)
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s.writeln('}')
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s.writeln(str_start)
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} else if line.contains('@else') {
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s.writeln(str_end)
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s.writeln(' } else { ')
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s.writeln(str_start)
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} else if line.contains('@for') {
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s.writeln(str_end)
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pos := line.index('@for') or {
continue
}
s.writeln('for ' + line[pos + 4..] + '{')
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s.writeln(str_start)
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} else if state == .html && line.contains('span.') && line.ends_with('{') {
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// `span.header {` => `<span class='header'>`
class := line.find_between('span.', '{').trim_space()
s.writeln('<span class="$class">')
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in_span = true
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} else if state == .html && line.contains('.') && line.ends_with('{') {
// `.header {` => `<div class='header'>`
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class := line.find_between('.', '{').trim_space()
s.writeln('<div class="$class">')
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} else if state == .html && line.contains('#') && line.ends_with('{') {
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// `#header {` => `<div id='header'>`
class := line.find_between('#', '{').trim_space()
s.writeln('<div id="$class">')
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} else if state == .html && line == '}' {
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if in_span {
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s.writeln('</span>')
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in_span = false
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} else {
s.writeln('</div>')
}
} else {
// HTML, may include `@var`
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s.writeln(line.replace('@', '\x24').replace("'", '"'))
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}
}
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s.writeln(str_end)
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s.writeln('_tmpl_res_$fn_name := sb.str() ')
s.writeln('}')
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s.writeln('// === end of vweb html template ===')
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return s.str()
}