/
comptime.v
351 lines (344 loc) · 8.72 KB
/
comptime.v
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// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module parser
import os
import v.ast
import v.pref
import v.token
const (
supported_comptime_calls = ['html', 'tmpl', 'env', 'embed_file']
)
// // #include, #flag, #v
fn (mut p Parser) hash() ast.HashStmt {
pos := p.tok.position()
val := p.tok.lit
kind := val.all_before(' ')
p.next()
mut main_str := ''
mut msg := ''
content := val.all_after('$kind ').all_before('//')
if content.contains(' #') {
main_str = content.all_before(' #').trim_space()
msg = content.all_after(' #').trim_space()
} else {
main_str = content.trim_space()
msg = ''
}
return ast.HashStmt{
mod: p.mod
source_file: p.file_name
val: val
kind: kind
main: main_str
msg: msg
pos: pos
}
}
fn (mut p Parser) comp_call() ast.ComptimeCall {
err_node := ast.ComptimeCall{
scope: 0
}
p.check(.dollar)
start_pos := p.prev_tok.position()
error_msg := 'only `\$tmpl()`, `\$env()`, `\$embed_file()` and `\$vweb.html()` comptime functions are supported right now'
if p.peek_tok.kind == .dot {
n := p.check_name() // skip `vweb.html()` TODO
if n != 'vweb' {
p.error(error_msg)
return err_node
}
p.check(.dot)
}
n := p.check_name() // (.name)
if n !in parser.supported_comptime_calls {
p.error(error_msg)
return err_node
}
is_embed_file := n == 'embed_file'
is_html := n == 'html'
// $env('ENV_VAR_NAME')
if n == 'env' {
p.check(.lpar)
spos := p.tok.position()
s := p.tok.lit
p.check(.string)
p.check(.rpar)
return ast.ComptimeCall{
scope: 0
method_name: n
args_var: s
is_env: true
env_pos: spos
pos: spos.extend(p.prev_tok.position())
}
}
p.check(.lpar)
spos := p.tok.position()
literal_string_param := if is_html { '' } else { p.tok.lit }
path_of_literal_string_param := literal_string_param.replace('/', os.path_separator)
if !is_html {
p.check(.string)
}
p.check(.rpar)
// $embed_file('/path/to/file')
if is_embed_file {
mut epath := path_of_literal_string_param
// Validate that the epath exists, and that it is actually a file.
if epath == '' {
p.error_with_pos('supply a valid relative or absolute file path to the file to embed',
spos)
return err_node
}
if !p.pref.is_fmt {
abs_path := os.real_path(epath)
// check absolute path first
if !os.exists(abs_path) {
// ... look relative to the source file:
epath = os.real_path(os.join_path(os.dir(p.file_name), epath))
if !os.exists(epath) {
p.error_with_pos('"$epath" does not exist so it cannot be embedded',
spos)
return err_node
}
if !os.is_file(epath) {
p.error_with_pos('"$epath" is not a file so it cannot be embedded',
spos)
return err_node
}
} else {
epath = abs_path
}
}
p.register_auto_import('v.embed_file')
return ast.ComptimeCall{
scope: 0
is_embed: true
embed_file: ast.EmbeddedFile{
rpath: literal_string_param
apath: epath
}
pos: start_pos.extend(p.prev_tok.position())
}
}
// Compile vweb html template to V code, parse that V code and embed the resulting V function
// that returns an html string.
fn_path := p.cur_fn_name.split('_')
fn_path_joined := fn_path.join(os.path_separator)
compiled_vfile_path := os.real_path(p.scanner.file_path.replace('/', os.path_separator))
tmpl_path := if is_html { '${fn_path.last()}.html' } else { path_of_literal_string_param }
// Looking next to the vweb program
dir := os.dir(compiled_vfile_path)
mut path := os.join_path(dir, fn_path_joined)
path += '.html'
path = os.real_path(path)
if !is_html {
path = os.join_path(dir, tmpl_path)
}
if !os.exists(path) {
if is_html {
// can be in `templates/`
path = os.join_path(dir, 'templates', fn_path_joined)
path += '.html'
}
if !os.exists(path) {
if p.pref.is_fmt {
return ast.ComptimeCall{
scope: 0
is_vweb: true
method_name: n
args_var: literal_string_param
pos: start_pos.extend(p.prev_tok.position())
}
}
if is_html {
p.error('vweb HTML template "$path" not found')
} else {
p.error('template file "$path" not found')
}
return err_node
}
// println('path is now "$path"')
}
tmp_fn_name := p.cur_fn_name.replace('.', '__')
$if trace_comptime ? {
println('>>> compiling comptime template file "$path" for $tmp_fn_name')
}
v_code := p.compile_template_file(path, tmp_fn_name)
$if print_vweb_template_expansions ? {
lines := v_code.split('\n')
for i, line in lines {
println('$path:${i + 1}: $line')
}
}
mut scope := &ast.Scope{
start_pos: 0
parent: p.global_scope
}
$if trace_comptime ? {
println('')
println('>>> template for $path:')
println(v_code)
println('>>> end of template END')
println('')
}
mut file := parse_comptime(v_code, p.table, p.pref, scope, p.global_scope)
file = ast.File{
...file
path: tmpl_path
}
// copy vars from current fn scope into vweb_tmpl scope
for stmt in file.stmts {
if stmt is ast.FnDecl {
if stmt.name == 'main.vweb_tmpl_$tmp_fn_name' {
// mut tmpl_scope := file.scope.innermost(stmt.body_pos.pos)
mut tmpl_scope := stmt.scope
for _, obj in p.scope.objects {
if obj is ast.Var {
mut v := obj
v.pos = stmt.body_pos
tmpl_scope.register(ast.Var{
...v
is_used: true
})
// set the controller action var to used
// if it's unused in the template it will warn
v.is_used = true
}
}
break
}
}
}
return ast.ComptimeCall{
scope: 0
is_vweb: true
vweb_tmpl: file
method_name: n
args_var: literal_string_param
pos: start_pos.extend(p.prev_tok.position())
}
}
fn (mut p Parser) comp_for() ast.CompFor {
// p.comp_for() handles these special forms:
// $for method in App(methods) {
// $for field in App(fields) {
p.next()
p.check(.key_for)
var_pos := p.tok.position()
val_var := p.check_name()
p.check(.key_in)
mut typ_pos := p.tok.position()
lang := p.parse_language()
typ := p.parse_any_type(lang, false, false)
typ_pos = typ_pos.extend(p.prev_tok.position())
p.check(.dot)
for_val := p.check_name()
mut kind := ast.CompForKind.methods
p.open_scope()
if for_val == 'methods' {
p.scope.register(ast.Var{
name: val_var
typ: p.table.find_type_idx('FunctionData')
pos: var_pos
})
} else if for_val == 'fields' {
p.scope.register(ast.Var{
name: val_var
typ: p.table.find_type_idx('FieldData')
pos: var_pos
})
kind = .fields
} else if for_val == 'attributes' {
p.scope.register(ast.Var{
name: val_var
typ: p.table.find_type_idx('StructAttribute')
pos: var_pos
})
kind = .attributes
} else {
p.error_with_pos('unknown kind `$for_val`, available are: `methods`, `fields` or `attributes`',
p.prev_tok.position())
return ast.CompFor{}
}
spos := p.tok.position()
stmts := p.parse_block()
p.close_scope()
return ast.CompFor{
val_var: val_var
stmts: stmts
kind: kind
typ: typ
typ_pos: typ_pos
pos: spos.extend(p.tok.position())
}
}
// @FN, @STRUCT, @MOD etc. See full list in token.valid_at_tokens
fn (mut p Parser) at() ast.AtExpr {
name := p.tok.lit
kind := match name {
'@FN' { token.AtKind.fn_name }
'@METHOD' { token.AtKind.method_name }
'@MOD' { token.AtKind.mod_name }
'@STRUCT' { token.AtKind.struct_name }
'@FILE' { token.AtKind.file_path }
'@LINE' { token.AtKind.line_nr }
'@COLUMN' { token.AtKind.column_nr }
'@VHASH' { token.AtKind.vhash }
'@VMOD_FILE' { token.AtKind.vmod_file }
'@VEXE' { token.AtKind.vexe_path }
'@VEXEROOT' { token.AtKind.vexeroot_path }
'@VMODROOT' { token.AtKind.vmodroot_path }
'@VROOT' { token.AtKind.vroot_path } // deprecated, use @VEXEROOT or @VMODROOT
else { token.AtKind.unknown }
}
p.next()
return ast.AtExpr{
name: name
pos: p.tok.position()
kind: kind
}
}
fn (mut p Parser) comptime_selector(left ast.Expr) ast.Expr {
p.check(.dollar)
start_pos := p.prev_tok.position()
if p.peek_tok.kind == .lpar {
method_pos := p.tok.position()
method_name := p.check_name()
p.mark_var_as_used(method_name)
// `app.$action()` (`action` is a string)
p.check(.lpar)
args := p.call_args()
p.check(.rpar)
if p.tok.kind == .key_orelse {
p.check(.key_orelse)
p.check(.lcbr)
}
return ast.ComptimeCall{
left: left
method_name: method_name
method_pos: method_pos
scope: p.scope
args_var: ''
args: args
pos: start_pos.extend(p.prev_tok.position())
}
}
mut has_parens := false
if p.tok.kind == .lpar {
p.check(.lpar)
has_parens = true
} else {
p.warn_with_pos('use brackets instead e.g. `s.$(field.name)` - run vfmt', p.tok.position())
}
expr := p.expr(0)
if has_parens {
p.check(.rpar)
}
return ast.ComptimeSelector{
has_parens: has_parens
left: left
field_expr: expr
pos: start_pos.extend(p.prev_tok.position())
}
}