2020-02-03 05:00:36 +01:00
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// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
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2019-12-22 02:34:37 +01:00
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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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2020-02-17 22:50:04 +01:00
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import (
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v.ast
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v.table
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strings
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)
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const (
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2020-02-18 03:28:39 +01:00
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tabs = ['', '\t', '\t\t', '\t\t\t', '\t\t\t\t', '\t\t\t\t\t', '\t\t\t\t\t\t']
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2020-02-17 22:50:04 +01:00
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// tabs = ['', ' ', ' ', ' ', ' ']
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2020-02-21 15:32:48 +01:00
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max_len = 80
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)
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2019-12-22 02:34:37 +01:00
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struct Fmt {
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out strings.Builder
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table &table.Table
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mut:
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indent int
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empty_line bool
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line_len int
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single_line_if bool
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cur_mod string
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}
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2020-02-18 17:54:14 +01:00
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pub fn fmt(file ast.File, table &table.Table) string {
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mut f := Fmt{
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out: strings.new_builder(1000)
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table: table
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indent: 0
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}
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f.mod(file.mod)
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f.imports(file.imports)
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for stmt in file.stmts {
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f.stmt(stmt)
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}
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return f.out.str().trim_space() + '\n'
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}
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pub fn (f mut Fmt) write(s string) {
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if f.indent > 0 && f.empty_line {
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f.out.write(tabs[f.indent])
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f.line_len += f.indent * 4
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}
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f.out.write(s)
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f.line_len += s.len
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f.empty_line = false
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}
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pub fn (f mut Fmt) writeln(s string) {
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if f.indent > 0 && f.empty_line {
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// println(f.indent.str() + s)
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f.out.write(tabs[f.indent])
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}
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f.out.writeln(s)
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f.empty_line = true
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f.line_len = 0
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}
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2020-02-18 22:35:14 +01:00
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fn (f mut Fmt) mod(mod ast.Module) {
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if mod.name != 'main' {
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f.writeln('module ${mod.name}\n')
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}
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f.cur_mod = mod.name
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}
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fn (f mut Fmt) imports(imports []ast.Import) {
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if imports.len == 1 {
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imp_stmt_str := f.imp_stmt_str(imports[0])
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f.writeln('import ${imp_stmt_str}\n')
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}
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else if imports.len > 1 {
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f.writeln('import (')
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f.indent++
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for imp in imports {
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f.writeln(f.imp_stmt_str(imp))
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}
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f.indent--
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f.writeln(')\n')
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}
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}
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fn (f Fmt) imp_stmt_str(imp ast.Import) string {
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is_diff := imp.alias != imp.mod && !imp.mod.ends_with('.' + imp.alias)
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imp_alias_suffix := if is_diff { ' as ${imp.alias}' } else { '' }
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return '${imp.mod}${imp_alias_suffix}'
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}
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fn (f mut Fmt) stmts(stmts []ast.Stmt) {
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f.indent++
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for stmt in stmts {
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f.stmt(stmt)
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}
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f.indent--
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}
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fn (f mut Fmt) stmt(node ast.Stmt) {
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match node {
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ast.AssignStmt {
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for i, left in it.left {
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2020-02-28 14:41:19 +01:00
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if left.var_info().is_mut {
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f.write('mut ')
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}
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f.expr(left)
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if i < it.left.len - 1 {
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f.write(', ')
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}
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}
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2020-02-23 11:22:07 +01:00
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f.write(' $it.op.str() ')
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for right in it.right {
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f.expr(right)
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}
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f.writeln('')
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}
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ast.Attr {
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f.writeln('[$it.name]')
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}
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ast.BranchStmt {
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match it.tok.kind {
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.key_break {
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f.writeln('break')
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}
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.key_continue {
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f.writeln('continue')
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}
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else {}
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}
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}
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ast.ConstDecl {
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if it.is_pub {
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f.write('pub ')
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}
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2020-02-17 22:50:04 +01:00
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f.writeln('const (')
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f.indent++
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for i, field in it.fields {
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name := field.name.after('.')
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f.write('$name = ')
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f.expr(it.exprs[i])
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f.writeln('')
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}
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f.indent--
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f.writeln(')\n')
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}
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2020-02-26 20:44:42 +01:00
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ast.DeferStmt {
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f.writeln('defer {')
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f.stmts(it.stmts)
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f.writeln('}')
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}
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ast.ExprStmt {
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f.expr(it.expr)
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if !f.single_line_if {
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f.writeln('')
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}
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}
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ast.FnDecl {
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2020-02-19 19:54:36 +01:00
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f.write(it.str(f.table))
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f.writeln(' {')
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f.stmts(it.stmts)
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f.writeln('}\n')
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}
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2020-02-22 14:39:25 +01:00
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ast.ForInStmt {
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f.write('for $it.key_var')
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if it.val_var != '' {
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f.write(', $it.val_var')
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}
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f.write(' in ')
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f.expr(it.cond)
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if it.is_range {
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f.write(' .. ')
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f.expr(it.high)
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}
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f.writeln(' {')
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f.stmts(it.stmts)
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f.writeln('}')
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}
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ast.ForStmt {
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f.write('for ')
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f.expr(it.cond)
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f.writeln(' {')
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f.stmts(it.stmts)
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f.writeln('}')
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}
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ast.Return {
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f.write('return')
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// multiple returns
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if it.exprs.len > 1 {
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f.write(' ')
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for i, expr in it.exprs {
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f.expr(expr)
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if i < it.exprs.len - 1 {
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f.write(', ')
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}
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}
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}
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// normal return
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else if it.exprs.len == 1 {
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f.write(' ')
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f.expr(it.exprs[0])
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}
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f.writeln('')
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}
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ast.StructDecl {
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f.struct_decl(it)
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}
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2020-02-26 20:45:03 +01:00
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ast.UnsafeStmt {
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f.writeln('unsafe {')
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f.stmts(it.stmts)
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f.writeln('}')
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}
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2020-02-17 22:50:04 +01:00
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ast.VarDecl {
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// type_sym := f.table.get_type_symbol(it.typ)
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if it.is_mut {
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f.write('mut ')
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}
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2020-02-27 21:51:40 +01:00
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if it.name2 == '' {
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f.write('$it.name := ')
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}
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else {
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f.write('/*2*/$it.name, $it.name2 := ')
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}
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2020-02-17 22:50:04 +01:00
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f.expr(it.expr)
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f.writeln('')
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}
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else {
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println('unknown node')
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// exit(1)
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}
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}
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}
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fn (f mut Fmt) struct_decl(node ast.StructDecl) {
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f.writeln('struct $node.name {')
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mut max := 0
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for field in node.fields {
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if field.name.len > max {
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max = field.name.len
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}
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}
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2020-02-22 14:13:19 +01:00
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for i, field in node.fields {
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if i == node.mut_pos {
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f.writeln('mut:')
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}
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else if i == node.pub_pos {
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f.writeln('pub:')
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}
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else if i == node.pub_mut_pos {
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f.writeln('pub mut:')
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}
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2020-02-17 22:50:04 +01:00
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f.write('\t$field.name ')
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f.write(strings.repeat(` `, max - field.name.len))
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f.writeln(f.type_to_str(field.typ))
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2020-02-17 22:50:04 +01:00
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}
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f.writeln('}\n')
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}
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2020-02-21 19:56:37 +01:00
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fn (f &Fmt) type_to_str(t table.Type) string {
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res := f.table.type_to_str(t)
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return res.replace(f.cur_mod + '.', '')
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}
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2020-02-17 22:50:04 +01:00
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fn (f mut Fmt) expr(node ast.Expr) {
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match node {
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ast.ArrayInit {
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2020-02-27 21:00:33 +01:00
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// `x := []string`
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if it.exprs.len == 0 && it.typ != 0 {
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f.write(f.table.type_to_str(it.typ))
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}
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// `[1,2,3]`
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else {
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// type_sym := f.table.get_type_symbol(it.typ)
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f.write('[')
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for i, expr in it.exprs {
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if i > 0 && it.exprs.len > 1 {
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f.wrap_long_line()
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}
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f.expr(expr)
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if i < it.exprs.len - 1 {
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f.write(', ')
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}
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2020-02-17 22:50:04 +01:00
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}
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2020-02-27 21:00:33 +01:00
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f.write(']')
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}
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}
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ast.AssignExpr {
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f.expr(it.left)
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f.write(' $it.op.str() ')
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f.expr(it.val)
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}
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2020-02-22 14:39:25 +01:00
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ast.Assoc {
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f.writeln('{')
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// f.indent++
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f.writeln('\t$it.name |')
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// TODO StructInit copy pasta
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for i, field in it.fields {
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f.write('\t$field: ')
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f.expr(it.exprs[i])
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f.writeln('')
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}
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// f.indent--
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f.write('}')
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}
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2020-02-17 22:50:04 +01:00
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ast.BoolLiteral {
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f.write(it.val.str())
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}
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2020-02-27 18:02:40 +01:00
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ast.CastExpr {
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f.write(f.table.type_to_str(it.typ) + '(')
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f.expr(it.expr)
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f.write(')')
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}
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2020-02-17 22:50:04 +01:00
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ast.CallExpr {
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f.write('${it.name}(')
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for i, expr in it.args {
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2020-02-27 21:00:33 +01:00
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if it.muts[i] {
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f.write('mut ')
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}
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2020-02-17 22:50:04 +01:00
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f.expr(expr)
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if i != it.args.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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}
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2020-02-27 21:51:40 +01:00
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ast.CharLiteral {
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f.write('`$it.val`')
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}
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2020-02-18 03:28:39 +01:00
|
|
|
ast.EnumVal {
|
2020-02-25 19:59:47 +01:00
|
|
|
f.write(it.enum_name + '.' + it.val)
|
2020-02-18 03:28:39 +01:00
|
|
|
}
|
2020-02-17 22:50:04 +01:00
|
|
|
ast.FloatLiteral {
|
|
|
|
f.write(it.val)
|
|
|
|
}
|
|
|
|
ast.IfExpr {
|
2020-02-21 16:48:37 +01:00
|
|
|
single_line := it.stmts.len == 1 && it.else_stmts.len == 1 && it.typ != table.void_type
|
|
|
|
f.single_line_if = single_line
|
2020-02-17 22:50:04 +01:00
|
|
|
f.write('if ')
|
|
|
|
f.expr(it.cond)
|
2020-02-21 16:48:37 +01:00
|
|
|
if single_line {
|
|
|
|
f.write(' { ')
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
f.writeln(' {')
|
|
|
|
}
|
2020-02-17 22:50:04 +01:00
|
|
|
f.stmts(it.stmts)
|
2020-02-21 16:48:37 +01:00
|
|
|
if single_line {
|
|
|
|
f.write(' ')
|
|
|
|
}
|
2020-02-18 03:28:39 +01:00
|
|
|
f.write('}')
|
2020-02-22 16:59:50 +01:00
|
|
|
if it.has_else {
|
|
|
|
f.write(' else ')
|
|
|
|
}
|
|
|
|
else if it.else_stmts.len > 0 {
|
2020-02-21 16:48:37 +01:00
|
|
|
f.write(' else {')
|
|
|
|
if single_line {
|
|
|
|
f.write(' ')
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
f.writeln('')
|
|
|
|
}
|
2020-02-17 22:50:04 +01:00
|
|
|
f.stmts(it.else_stmts)
|
2020-02-21 16:48:37 +01:00
|
|
|
if single_line {
|
|
|
|
f.write(' ')
|
|
|
|
}
|
2020-02-18 03:28:39 +01:00
|
|
|
f.write('}')
|
2020-02-17 22:50:04 +01:00
|
|
|
}
|
2020-02-21 16:48:37 +01:00
|
|
|
f.single_line_if = false
|
2020-02-17 22:50:04 +01:00
|
|
|
}
|
|
|
|
ast.Ident {
|
2020-02-27 21:51:40 +01:00
|
|
|
if it.kind == .blank_ident {
|
|
|
|
f.write('_')
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
f.write('$it.name')
|
|
|
|
}
|
2020-02-17 22:50:04 +01:00
|
|
|
}
|
|
|
|
ast.InfixExpr {
|
|
|
|
f.expr(it.left)
|
|
|
|
f.write(' $it.op.str() ')
|
2020-02-21 16:14:15 +01:00
|
|
|
f.wrap_long_line()
|
2020-02-17 22:50:04 +01:00
|
|
|
f.expr(it.right)
|
|
|
|
}
|
|
|
|
ast.IndexExpr {
|
|
|
|
f.index_expr(it)
|
|
|
|
}
|
|
|
|
ast.IntegerLiteral {
|
|
|
|
f.write(it.val.str())
|
|
|
|
}
|
2020-02-22 14:13:19 +01:00
|
|
|
ast.MapInit {
|
|
|
|
f.writeln('{')
|
|
|
|
f.indent++
|
|
|
|
/*
|
|
|
|
mut max := 0
|
|
|
|
for i, key in it.keys {
|
|
|
|
if key.len > max {
|
|
|
|
max = key.len
|
|
|
|
}
|
|
|
|
}
|
|
|
|
*/
|
|
|
|
|
|
|
|
for i, key in it.keys {
|
|
|
|
f.expr(key)
|
|
|
|
// f.write(strings.repeat(` `, max - field.name.len))
|
|
|
|
f.write(': ')
|
|
|
|
f.expr(it.vals[i])
|
|
|
|
f.writeln('')
|
|
|
|
}
|
|
|
|
f.indent--
|
|
|
|
f.write('}')
|
|
|
|
}
|
2020-02-18 03:28:39 +01:00
|
|
|
ast.MethodCallExpr {
|
|
|
|
f.expr(it.expr)
|
|
|
|
f.write('.' + it.name + '(')
|
|
|
|
for i, arg in it.args {
|
2020-02-27 21:00:33 +01:00
|
|
|
if it.muts[i] {
|
|
|
|
f.write('mut ')
|
|
|
|
}
|
2020-02-21 16:14:15 +01:00
|
|
|
if i > 0 {
|
|
|
|
f.wrap_long_line()
|
|
|
|
}
|
2020-02-18 03:28:39 +01:00
|
|
|
f.expr(arg)
|
|
|
|
if i < it.args.len - 1 {
|
|
|
|
f.write(', ')
|
|
|
|
}
|
|
|
|
}
|
|
|
|
f.write(')')
|
2020-02-28 15:36:41 +01:00
|
|
|
if it.or_block.stmts.len > 0 {
|
|
|
|
f.writeln(' or {')
|
|
|
|
f.stmts(it.or_block.stmts)
|
|
|
|
f.write('}')
|
|
|
|
}
|
2020-02-18 03:28:39 +01:00
|
|
|
}
|
2020-02-21 17:52:20 +01:00
|
|
|
ast.None {
|
|
|
|
f.write('none')
|
|
|
|
}
|
2020-02-28 15:36:41 +01:00
|
|
|
ast.IfGuardExpr {
|
2020-02-27 18:02:40 +01:00
|
|
|
f.write(it.var_name + ' := ')
|
|
|
|
f.expr(it.expr)
|
|
|
|
}
|
2020-02-28 15:36:41 +01:00
|
|
|
ast.ParExpr {
|
2020-02-28 14:41:19 +01:00
|
|
|
f.write('(')
|
|
|
|
f.expr(it.expr)
|
|
|
|
f.write(')')
|
2020-02-28 15:36:41 +01:00
|
|
|
}
|
2020-02-17 22:50:04 +01:00
|
|
|
ast.PostfixExpr {
|
|
|
|
f.expr(it.expr)
|
|
|
|
f.write(it.op.str())
|
|
|
|
}
|
|
|
|
ast.PrefixExpr {
|
|
|
|
f.write(it.op.str())
|
|
|
|
f.expr(it.right)
|
|
|
|
}
|
|
|
|
ast.SelectorExpr {
|
|
|
|
f.expr(it.expr)
|
|
|
|
f.write('.')
|
|
|
|
f.write(it.field)
|
|
|
|
}
|
|
|
|
ast.StringLiteral {
|
2020-02-18 03:28:39 +01:00
|
|
|
if it.val.contains("'") {
|
|
|
|
f.write('"$it.val"')
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
f.write("'$it.val'")
|
|
|
|
}
|
2020-02-17 22:50:04 +01:00
|
|
|
}
|
|
|
|
ast.StructInit {
|
|
|
|
type_sym := f.table.get_type_symbol(it.typ)
|
2020-02-22 16:59:50 +01:00
|
|
|
// `Foo{}` on one line if there are no fields
|
|
|
|
if it.fields.len == 0 {
|
|
|
|
f.write('$type_sym.name{}')
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
f.writeln('$type_sym.name{')
|
|
|
|
for i, field in it.fields {
|
|
|
|
f.write('\t$field: ')
|
|
|
|
f.expr(it.exprs[i])
|
|
|
|
f.writeln('')
|
|
|
|
}
|
|
|
|
f.write('}')
|
2020-02-17 22:50:04 +01:00
|
|
|
}
|
|
|
|
}
|
2020-02-27 18:02:40 +01:00
|
|
|
else {
|
|
|
|
println('fmt expr: unhandled node ') // + typeof(node))
|
|
|
|
}
|
2020-02-17 22:50:04 +01:00
|
|
|
}
|
|
|
|
}
|
2019-12-22 02:34:37 +01:00
|
|
|
|
2020-02-21 16:14:15 +01:00
|
|
|
fn (f mut Fmt) wrap_long_line() {
|
|
|
|
if f.line_len > max_len {
|
|
|
|
f.write('\n' + tabs[f.indent + 1])
|
|
|
|
f.line_len = 0
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2020-02-17 22:50:04 +01:00
|
|
|
fn (f mut Fmt) index_expr(node ast.IndexExpr) {
|
|
|
|
mut is_range := false
|
|
|
|
match node.index {
|
|
|
|
ast.RangeExpr {
|
|
|
|
is_range = true
|
|
|
|
f.expr(node.left)
|
2020-02-24 16:37:20 +01:00
|
|
|
f.write('[')
|
|
|
|
f.expr(it.low)
|
2020-02-17 22:50:04 +01:00
|
|
|
f.write('..')
|
|
|
|
f.expr(it.high)
|
2020-02-24 16:37:20 +01:00
|
|
|
f.write(']')
|
2020-02-17 22:50:04 +01:00
|
|
|
}
|
|
|
|
else {}
|
|
|
|
}
|
|
|
|
if !is_range {
|
|
|
|
f.expr(node.left)
|
|
|
|
f.write('[')
|
|
|
|
f.expr(node.index)
|
|
|
|
f.write(']')
|
|
|
|
}
|
2019-12-22 02:34:37 +01:00
|
|
|
}
|