92 lines
1.3 KiB
V
92 lines
1.3 KiB
V
module cgen
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import (
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strings
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compiler2.ast
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)
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struct Gen {
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out strings.Builder
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}
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pub fn gen(program ast.Program) {
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mut g := Gen{out:strings.new_builder(100)}
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for expr in program.exprs {
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g.expr(expr)
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g.writeln('')
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}
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println(g.out.str())
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}
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pub fn (g &Gen) save() {
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}
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pub fn (g mut Gen) write(s string) {
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g.out.write(s)
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}
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pub fn (g mut Gen) writeln(s string) {
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g.out.writeln(s)
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}
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struct Type {
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name string
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}
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const (
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string_type = Type{'string'}
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int_type = Type{'int'}
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void_type = Type{'void'}
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)
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fn (g mut Gen) expr(node ast.Expr) Type {
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//println('cgen expr()')
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match node {
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ast.IntegerExpr {
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g.write(it.val.str())
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return int_type
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}
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ast.ScalarExpr {
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g.expr(it.left)
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g.write(' $it.val ')
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}
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ast.UnaryExpr {
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g.expr(it.left)
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g.write(' $it.op ')
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}
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ast.StringLiteral {
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g.write('"$it.val"')
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return string_type
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}
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ast.BinaryExpr {
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typ := g.expr(it.left)
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match it.op {
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.plus { g.write(' + ') }
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.minus { g.write(' - ') }
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.mul { g.write(' * ') }
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.div { g.write(' / ') }
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else {}
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}
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typ2 := g.expr(it.right)
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if typ.name != typ2.name {
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println('bad types $typ.name $typ2.name')
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}
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return typ
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}
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ast.VarDecl {
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g.write('var $it.name = ')
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g.expr(it.expr)
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g.writeln(';')
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return void_type
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}
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else {
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println('bad node')
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}
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}
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return void_type
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}
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