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v/vlib/compiler/string_expression.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 compiler
fn (p mut Parser) string_expr() {
is_raw := p.tok == .name && p.lit == 'r'
is_cstr := p.tok == .name && p.lit == 'c'
if is_raw || is_cstr {
p.next()
}
str := p.lit
// No ${}, just return a simple string
if p.peek() != .str_dollar || is_raw {
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f := if is_raw { cescaped_path(str) } else { format_str(str) }
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// `C.puts('hi')` => `puts("hi");`
/*
Calling a C function sometimes requires a call to a string method
C.fun('ssss'.to_wide()) => fun(string_to_wide(tos3("ssss")))
*/
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if (p.calling_c && p.peek() != .dot) || is_cstr || (p.pref.translated && p.mod == 'main') {
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if p.os == .windows && p.mod == 'ui' {
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p.gen('L"$f"')
}
else {
p.gen('"$f"')
}
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}
else if p.is_sql {
p.gen("'$str'")
}
else if p.is_js {
p.gen('tos("$f")')
}
else {
p.gen('tos3("$f")')
}
p.next()
if p.scanner.is_fmt && p.tok == .not {
// handle '$age'!
// TODO remove this hack, do this automatically
p.fgen(' ')
p.check(.not)
}
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return
}
$if js {
p.error('js backend does not support string formatting yet')
}
p.is_alloc = true // $ interpolation means there's allocation
mut args := '"'
mut format := '"'
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mut complex_inter := false // for vfmt
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for p.tok == .str {
// Add the string between %d's
p.lit = p.lit.replace('%', '%%')
format += format_str(p.lit)
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p.next() // skip $
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if p.tok != .str_dollar {
continue
}
// Handle .dollar
p.check(.str_dollar)
// If there's no string after current token, it means we are in
// a complex expression (`${...}`)
if p.peek() != .str {
p.fgen('{')
complex_inter = true
}
// Get bool expr inside a temp var
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typ,val_ := p.tmp_expr()
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val := val_.trim_space()
args += ', $val'
if typ == 'string' {
// args += '.str'
// printf("%.*s", a.len, a.str) syntax
args += '.len, ${val}.str'
}
if typ == 'ustring' {
args += '.len, ${val}.s.str'
}
if typ == 'bool' {
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// args += '.len, ${val}.str'
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}
// Custom format? ${t.hour:02d}
custom := p.tok == .colon
if custom {
mut cformat := ''
p.next()
if p.tok == .dot {
cformat += '.'
p.next()
}
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if p.tok == .minus {
// support for left aligned formatting
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cformat += '-'
p.next()
}
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cformat += p.lit // 02
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p.next()
fspec := p.lit // f
cformat += fspec
if fspec == 's' {
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// println('custom str F=$cformat | format_specifier: "$fspec" | typ: $typ ')
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if typ != 'string' {
p.error('only V strings can be formatted with a :${cformat} format, but you have given "${val}", which has type ${typ}')
}
args = args.all_before_last('${val}.len, ${val}.str') + '${val}.str'
}
format += '%$cformat'
p.next()
}
else {
f := p.typ_to_fmt(typ, 0)
if f == '' {
is_array := typ.starts_with('array_')
typ2 := p.table.find_type(typ)
has_str_method := p.table.type_has_method(typ2, 'str')
if is_array || has_str_method {
if is_array && !has_str_method {
p.gen_array_str(typ2)
}
tmp_var := p.get_tmp()
p.cgen.insert_before('string $tmp_var = ${typ}_str(${val});')
args = args.all_before_last(val) + '${tmp_var}.len, ${tmp_var}.str'
format += '%.*s '
}
else {
p.error('unhandled sprintf format "$typ" ')
}
}
format += f
}
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// println('interpolation format is: |${format}| args are: |${args}| ')
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}
if complex_inter {
p.fgen('}')
}
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// p.fgen('\'')
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// println("hello %d", num) optimization.
if p.cgen.nogen {
return
}
// println: don't allocate a new string, just print it.
$if !windows {
cur_line := p.cgen.cur_line.trim_space()
if cur_line == 'println (' && p.tok != .plus {
p.cgen.resetln(cur_line.replace('println (', 'printf('))
p.gen('$format\\n$args')
return
}
}
// '$age'! means the user wants this to be a tmp string (uses global buffer, no allocation,
// won't be used again)
// TODO remove this hack, do this automatically
if p.tok == .not {
p.fgen(' ')
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p.check(.not)
p.gen('_STR_TMP($format$args)')
}
else {
// Otherwise do len counting + allocation + sprintf
p.gen('_STR($format$args)')
}
}
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