295 lines
8.6 KiB
V
295 lines
8.6 KiB
V
// Copyright (c) 2019-2022 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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module fmt
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import strings
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import v.ast
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import v.mathutil as mu
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pub fn (mut f Fmt) struct_decl(node ast.StructDecl) {
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f.attrs(node.attrs)
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if node.is_pub {
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f.write('pub ')
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}
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if node.is_union {
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f.write('union ')
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} else {
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f.write('struct ')
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}
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f.write_language_prefix(node.language)
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name := node.name.after('.') // strip prepended module
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f.write(name)
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f.write_generic_types(node.generic_types)
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if node.fields.len == 0 && node.embeds.len == 0 && node.pos.line_nr == node.pos.last_line {
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f.writeln(' {}')
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return
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}
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mut field_aligns := []AlignInfo{}
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mut comment_aligns := []AlignInfo{}
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mut default_expr_aligns := []AlignInfo{}
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mut field_types := []string{cap: node.fields.len}
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for i, field in node.fields {
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ft := f.no_cur_mod(f.table.type_to_str_using_aliases(field.typ, f.mod2alias))
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field_types << ft
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attrs_len := inline_attrs_len(field.attrs)
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end_pos := field.pos.pos + field.pos.len
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mut comments_len := 0 // Length of comments between field name and type
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for comment in field.comments {
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if comment.pos.pos >= end_pos {
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if comment.pos.line_nr == field.pos.line_nr {
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comment_aligns.add_info(attrs_len, field_types[i].len, comment.pos.line_nr,
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use_threshold: true)
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}
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continue
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}
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if comment.pos.pos > field.pos.pos {
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comments_len += '/* ${comment.text.trim_left('\x01')} */ '.len
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}
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}
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field_aligns.add_info(comments_len + field.name.len, ft.len, field.pos.line_nr)
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if field.has_default_expr {
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default_expr_aligns.add_info(attrs_len, field_types[i].len, field.pos.line_nr,
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use_threshold: true)
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}
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}
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f.writeln(' {')
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for embed in node.embeds {
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f.mark_types_import_as_used(embed.typ)
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styp := f.table.type_to_str_using_aliases(embed.typ, f.mod2alias)
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pre_comments := embed.comments.filter(it.pos.pos < embed.pos.pos)
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comments := embed.comments[pre_comments.len..]
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f.comments_before_field(pre_comments)
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if comments.len == 0 {
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f.writeln('\t$styp')
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} else {
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f.write('\t$styp')
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f.comments(comments, level: .indent)
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}
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}
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mut field_align_i := 0
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mut comment_align_i := 0
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mut default_expr_align_i := 0
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mut inc_indent := false // for correct indents with multi line default exprs
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for i, field in node.fields {
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if i == node.mut_pos {
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f.writeln('mut:')
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} else if i == node.pub_pos {
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f.writeln('pub:')
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} else if i == node.pub_mut_pos {
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f.writeln('pub mut:')
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} else if i == node.global_pos {
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f.writeln('__global:')
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} else if i == node.module_pos {
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f.writeln('module:')
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} else if i > 0 {
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// keep one empty line between fields (exclude one after mut:, pub:, ...)
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mut before_last_line := node.fields[i - 1].pos.line_nr
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if node.fields[i - 1].comments.len > 0 {
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before_last_line = mu.max(before_last_line, node.fields[i - 1].comments.last().pos.last_line)
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}
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if node.fields[i - 1].has_default_expr {
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before_last_line = mu.max(before_last_line, node.fields[i - 1].default_expr.pos().last_line)
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}
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mut next_first_line := field.pos.line_nr
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if field.comments.len > 0 {
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next_first_line = mu.min(next_first_line, field.comments[0].pos.line_nr)
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}
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if next_first_line - before_last_line > 1 {
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f.writeln('')
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}
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}
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end_pos := field.pos.pos + field.pos.len
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before_comments := field.comments.filter(it.pos.pos < field.pos.pos)
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between_comments := field.comments[before_comments.len..].filter(it.pos.pos < end_pos)
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after_type_comments := field.comments[(before_comments.len + between_comments.len)..]
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// Handle comments before the field
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f.comments_before_field(before_comments)
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volatile_prefix := if field.is_volatile { 'volatile ' } else { '' }
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f.write('\t$volatile_prefix$field.name ')
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// Handle comments between field name and type
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before_len := f.line_len
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f.comments(between_comments, iembed: true, has_nl: false)
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comments_len := f.line_len - before_len
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mut field_align := field_aligns[field_align_i]
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if field_align.line_nr < field.pos.line_nr {
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field_align_i++
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field_align = field_aligns[field_align_i]
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}
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f.write(strings.repeat(` `, field_align.max_len - field.name.len - comments_len))
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f.write(field_types[i])
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f.mark_types_import_as_used(field.typ)
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attrs_len := inline_attrs_len(field.attrs)
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has_attrs := field.attrs.len > 0
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if has_attrs {
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f.write(strings.repeat(` `, field_align.max_type_len - field_types[i].len))
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f.single_line_attrs(field.attrs, inline: true)
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}
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if field.has_default_expr {
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mut align := default_expr_aligns[default_expr_align_i]
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if align.line_nr < field.pos.line_nr {
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default_expr_align_i++
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align = default_expr_aligns[default_expr_align_i]
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}
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pad_len := align.max_len - attrs_len + align.max_type_len - field_types[i].len
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f.write(strings.repeat(` `, pad_len))
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f.write(' = ')
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if !expr_is_single_line(field.default_expr) {
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f.indent++
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inc_indent = true
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}
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f.expr(field.default_expr)
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if inc_indent {
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f.indent--
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inc_indent = false
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}
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}
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// Handle comments after field type
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if after_type_comments.len > 0 {
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if after_type_comments[0].pos.line_nr > field.pos.line_nr {
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f.writeln('')
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} else {
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if !field.has_default_expr {
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mut align := comment_aligns[comment_align_i]
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if align.line_nr < field.pos.line_nr {
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comment_align_i++
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align = comment_aligns[comment_align_i]
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}
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pad_len := align.max_len - attrs_len + align.max_type_len - field_types[i].len
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f.write(strings.repeat(` `, pad_len))
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}
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f.write(' ')
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}
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f.comments(after_type_comments, level: .indent)
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} else {
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f.writeln('')
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}
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}
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f.comments_after_last_field(node.end_comments)
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f.writeln('}\n')
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}
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pub fn (mut f Fmt) struct_init(node ast.StructInit) {
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struct_init_save := f.is_struct_init
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f.is_struct_init = true
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defer {
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f.is_struct_init = struct_init_save
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}
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type_sym := f.table.sym(node.typ)
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// f.write('<old name: $type_sym.name>')
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mut name := type_sym.name
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if !name.starts_with('C.') && !name.starts_with('JS.') {
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name = f.no_cur_mod(f.short_module(type_sym.name)) // TODO f.type_to_str?
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}
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if name == 'void' {
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name = ''
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}
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if node.fields.len == 0 && !node.has_update_expr {
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// `Foo{}` on one line if there are no fields or comments
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if node.pre_comments.len == 0 {
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f.write('$name{}')
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} else {
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f.writeln('$name{')
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f.comments(node.pre_comments, inline: true, has_nl: true, level: .indent)
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f.write('}')
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}
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f.mark_import_as_used(name)
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} else if node.is_short {
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// `Foo{1,2,3}` (short syntax )
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f.write('$name{')
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f.mark_import_as_used(name)
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if node.has_update_expr {
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f.write('...')
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f.expr(node.update_expr)
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f.write(', ')
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}
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for i, field in node.fields {
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f.expr(field.expr)
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if i < node.fields.len - 1 {
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f.write(', ')
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}
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}
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f.write('}')
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} else {
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use_short_args := f.use_short_fn_args && !node.has_update_expr
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f.use_short_fn_args = false
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mut single_line_fields := f.single_line_fields
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f.single_line_fields = false
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if node.pos.line_nr < node.pos.last_line || node.pre_comments.len > 0 {
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single_line_fields = false
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}
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if !use_short_args {
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f.write('$name{')
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f.mark_import_as_used(name)
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if single_line_fields {
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f.write(' ')
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}
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}
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fields_start := f.out.len
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fields_loop: for {
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if !single_line_fields {
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if use_short_args && f.out[f.out.len - 1] == ` ` {
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// v Remove space at tail of line
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// f(a, b, c, \n
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// f1: 0\n
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// f2: 1\n
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// )
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f.out.go_back(1)
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}
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f.writeln('')
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f.indent++
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}
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f.comments(node.pre_comments, inline: true, has_nl: true, level: .keep)
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if node.has_update_expr {
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f.write('...')
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f.expr(node.update_expr)
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if single_line_fields {
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if node.fields.len > 0 {
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f.write(', ')
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}
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} else {
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f.writeln('')
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}
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f.comments(node.update_expr_comments, inline: true, has_nl: true, level: .keep)
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}
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for i, field in node.fields {
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f.write('$field.name: ')
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f.expr(field.expr)
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f.comments(field.comments, inline: true, has_nl: false, level: .indent)
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if single_line_fields {
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if i < node.fields.len - 1 {
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f.write(', ')
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}
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} else {
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f.writeln('')
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}
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f.comments(field.next_comments, inline: false, has_nl: true, level: .keep)
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if single_line_fields && (field.comments.len > 0
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|| field.next_comments.len > 0
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|| !expr_is_single_line(field.expr)
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|| f.line_len > max_len.last()) {
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single_line_fields = false
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f.out.go_back_to(fields_start)
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f.line_len = fields_start
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f.remove_new_line()
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continue fields_loop
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}
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}
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break
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}
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if !single_line_fields {
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f.indent--
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}
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if !use_short_args {
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if single_line_fields {
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f.write(' ')
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}
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f.write('}')
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}
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}
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}
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