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/*
Copyright 2020 Kyle Gunger
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package tparse
// TODO: re-validate this code. I forgot if it works or not.
func parseBlock(tokens *[]Token, tok, max int) (Node, int) {
out, tmp, def, name := Node{}, Node{}, Node{}, false
out.Data = Token{Type: 10, Data: "block"}
def.Data = Token{Type: 10, Data: "blockdef"}
tok++
for ;tok < max; tok++{
t := (*tokens)[tok]
tmp = Node{}
switch t.Type {
case DELIMIT:
if t.Data == "(" {
tmp, tok = parseValueList(tokens, tok, max)
def.Sub = append(def.Sub, tmp)
} else if t.Data == "[" {
tmp, tok = parseTypeList(tokens, tok, max)
def.Sub = append(def.Sub, tmp)
} else {
goto BREAK
}
case DEFWORD:
if name {
errOut("Unexpected defword, the block has already been given a name or keyword.", t)
}
tmp.Data = t
def.Sub = append(def.Sub, tmp)
name = true
case KEYWORD:
if name {
errOut("Unexpected keyword, the block has already been given a name or keyword.", t)
}
switch t.Data {
case "else":
if (*tokens)[tok+1].Data == "if" {
tmp.Data = Token{KEYWORD, "elif", t.Line, t.Char}
tok++
name = true
continue
}
case "if", "match", "case", "loop":
case "export", "inline", "raw", "override":
}
case LINESEP:
goto BREAK
}
}
BREAK:
out.Sub = append(out.Sub, def)
for ;tok < max; {
t := (*tokens)[tok]
switch t.Data {
case ";/", ";;", ";:":
return out, tok
case ";":
tmp, tok = parseStatement(tokens, tok, max)
case "/;":
REBLOCK:
tmp, tok = parseBlock(tokens, tok, max)
if (*tokens)[tok].Data == ";;" {
out.Sub = append(out.Sub, tmp)
goto REBLOCK
} else if (*tokens)[tok].Data == ";/" {
tok++
}
default:
errOut("Error: unexpected token when parsing a code block", t)
}
out.Sub = append(out.Sub, tmp)
}
return out, tok
}
// This should work once isTypeThenValue properly functions
func parseStatement(tokens *[]Token, tok, max int) (Node, int) {
out := Node{}
out.Data = Token{Type: 11, Data: ";"}
var tmp Node
// Check for keyword, definition, then if none of those apply, assume it's a value.
if (*tokens)[tok].Type == KEYWORD {
tmp, tok = keywordStatement(tokens, tok, max)
out.Sub = append(out.Sub, tmp)
} else {
// do check for definition
if isTypeThenValue(tokens, tok, max) {
// if not, parse a value
tmp, tok = parseDef(tokens, tok, max)
} else {
// if not, parse a value
tmp, tok = parseValue(tokens, tok, max)
}
out.Sub = append(out.Sub, tmp)
}
return out, tok
}
// Works? Please test.
func keywordStatement(tokens *[]Token, tok, max int) (Node, int) {
out := Node{}
out.Data = (*tokens)[tok]
out.IsBlock = false
var tmp Node
tmp.IsBlock = false
if tok + 1 < max {
tok++
} else {
return out, max
}
switch out.Data.Data {
case "raw":
// Something, something... code.
if (*tokens)[tok].Data != "struct" {
errOut("Unexpected use of raw operator in a statement", out.Data)
}
tok++
fallthrough
case "struct":
// Check for defword, (), and {} then dip
if (*tokens)[tok].Type != DEFWORD {
errOut("Expected defword after struct keyword.", (*tokens)[tok])
}
tmp.Data = (*tokens)[tok]
out.Sub = append(out.Sub, tmp)
tok++
if (*tokens)[tok].Data == "(" {
tmp, tok = parseValueList(tokens, tok, max)
out.Sub = append(out.Sub, tmp)
}
if (*tokens)[tok].Data != "{" {
errOut("Could not find struct member list", (*tokens)[tok])
}
tmp, tok = parseValueList(tokens, tok, max)
case "goto", "label":
if (*tokens)[tok].Type != DEFWORD {
errOut("Expected defword after goto or label keyword.", out.Data)
}
tmp.Data = (*tokens)[tok]
tok++
// Check for a defword and dip
case "continue", "break":
if (*tokens)[tok].Type != LITERAL {
return out, tok
}
tmp.Data = (*tokens)[tok]
tok++
// Check for a numerical value and dip
case "alloc", "salloc":
// Parse value list
tmp, tok = parseValueList(tokens, tok, max)
case "delete":
// Parse value list
tmp, tok = parseValueList(tokens, tok, max)
}
out.Sub = append(out.Sub, tmp)
return out, tok
}
// Should work, but none of this is tested.
func parseDef(tokens *[]Token, tok, max int) (Node, int) {
out := Node{}
out.Data = Token{}
var tmp Node
tmp, tok = parseType(tokens, tok, max, false)
out.Sub = append(out.Sub, tmp)
tmp, tok = parseValueList(tokens, tok, max)
out.Sub = append(out.Sub, tmp)
return out, tok
}
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