Initial commit

switches.odin

@@ -0,0 +1,107 @@
+package main
+
+import "core:strings"
+import "core:fmt"
+
+SwitchDefinition :: struct {
+	name: string,
+	fullname: string,
+	shortname: string,
+	usage: string,
+	description: string,
+	no_argument: bool,
+	callback: proc(value: string, data: rawptr) -> (ok: bool),
+}
+
+SwitchSplitError :: enum {
+	None,
+	Empty,
+	MissingDash,
+	MissingStartQuote,
+	MissingEndQuote,
+}
+
+switch_split :: proc(str: string) -> (name, value: string, err: SwitchSplitError) {
+	name = ""
+	value = ""
+	err = .None
+
+	if len(str) == 0 {
+		err = .Empty
+		return
+	}
+	if str[0] != '-' {
+		err = .MissingDash
+		return
+	}
+	colon_index := strings.index_rune(str, ':')
+	if colon_index == -1 {
+		name = str[1:]
+		return
+	}
+	name = str[1:colon_index]
+	value = str[colon_index + 1:]
+	if value[0] != '"' && value[len(value) - 1] == '"' {
+		err = .MissingStartQuote
+		return
+	} else if value[0] == '"' && value[len(value) - 1] != '"' {
+		err = .MissingEndQuote
+		return
+	}
+	if value[0] == '"' && value[len(value) - 1] == '"' {
+		value = value[1:len(value) - 2]
+	}
+	return
+}
+
+
+process_switches :: proc(args: []string, switch_definitions: []SwitchDefinition, allocator := context.allocator, data: rawptr) -> bool {
+	ok := true
+	error_state: bool
+	switch_map := make(map[string]SwitchDefinition)
+	for switch_definition in switch_definitions {
+		shortname := switch_definition.shortname
+		shortname_length := len(shortname)
+		if shortname_length > 0 {
+			if shortname in switch_map {
+				ok = false
+				existing_switch_definition := switch_map[shortname]
+				fmt.eprintln("Argument error: Switch for ", switch_definition.name, " (", shortname, ") already existed for '", existing_switch_definition.name, sep = "")
+			} else {
+				switch_map[shortname] = switch_definition
+			}
+		}
+
+		fullname := switch_definition.fullname
+		fullname_length := len(fullname)
+		if fullname_length > 0 {
+			if fullname in switch_map {
+				ok = false
+				existing_switch_definition := switch_map[fullname]
+				fmt.eprintln("Argument error: Switch for ", switch_definition.name, " (", fullname, ") already existed for '", existing_switch_definition.name, sep = "")
+			} else {
+				switch_map[fullname] = switch_definition
+			}
+		}
+
+		if shortname_length == 0 && fullname_length == 0 {
+			ok = false
+			fmt.eprintln("Switch definition error: ", switch_definition.name, " had no shortname or fullname", sep = "")
+		}
+	}
+	for arg in args {
+		name, value, err := switch_split(arg)
+		if err != .None {
+			ok = false
+			fmt.eprintln("Argument error: ", err, " (", arg, ")", sep = "")
+			continue
+		}
+		if name not_in switch_map {
+			ok = false
+			fmt.eprintln("Argument error: Non-existent switch", name, sep = "")
+			continue
+		}
+		switch_map[name].callback(value, data)
+	}
+	return ok
+}