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..types.. <- TRUE
if(!exists("..env..")) source("env.r")
# General type related functions
concat <- function(..., sep="") paste(..., collapse="", sep=sep)
concatl <- function(lst, sep="") paste(lst, collapse=sep, sep=sep)
slice <- function(seq, start=1, end=-1) {
if (end == -1) end <- length(seq)
if (start > end) lst <- list() else lst <- seq[start:end]
switch(class(seq),
list={ new.listl(lst) },
List={ new.listl(lst) },
Vector={ new.vectorl(lst) },
{ throw("slice called on non-sequence") })
}
.sequential_q <- function(obj) .list_q(obj) || .vector_q(obj)
.equal_q <- function(a,b) {
ota <- class(a); otb <- class(b)
if (!((ota == otb) || (.sequential_q(a) && .sequential_q(b)))) {
return(FALSE)
}
switch(ota,
"List"={
if (length(a) != length(b)) return(FALSE)
if (length(a) == 0) return(TRUE)
for(i in seq(length(a))) {
if (!.equal_q(a[[i]],b[[i]])) return(FALSE)
}
TRUE
},
"Vector"={
if (length(a) != length(b)) return(FALSE)
if (length(a) == 0) return(TRUE)
for(i in seq(length(a))) {
if (!.equal_q(a[[i]],b[[i]])) return(FALSE)
}
TRUE
},
{
a == b
})
}
.clone <- function(obj) {
if (.hash_map_q(obj)) {
new_obj <- new.env()
for(k in ls(obj, all.names=TRUE)) new_obj[[k]] = obj[[k]]
class(new_obj) <- "HashMap"
} else {
new_obj <- obj
}
new_obj
}
# Errors/exceptions
thrown_error = new.env()
thrown_error$val = NULL
throw <- function(obj) {
thrown_error$val = obj
stop("<mal_exception>")
}
get_error <- function(e) {
estr <- e$message
if (estr == "<mal_exception>") {
err <- thrown_error$val
thrown_error$val <- NULL
err
} else {
estr
}
}
# Scalars
nil <- structure("malnil", class="nil")
.nil_q <- function(obj) "nil" == class(obj)
.true_q <- function(obj) "logical" == class(obj) && obj == TRUE
.false_q <- function(obj) "logical" == class(obj) && obj == FALSE
new.symbol <- function(name) structure(name, class="Symbol")
.symbol_q <- function(obj) "Symbol" == class(obj)
new.keyword <- function(name) concat("\u029e", name)
.keyword_q <- function(obj) {
"character" == class(obj) && "\u029e" == substr(obj,1,1)
}
# Functions
malfunc <- function(eval, ast, env, params) {
gen_env <- function(args) new.Env(env, params, args)
structure(list(eval=eval,
ast=ast,
env=env,
params=params,
gen_env=gen_env,
ismacro=FALSE), class="MalFunc")
}
.malfunc_q <- function(obj) "MalFunc" == class(obj)
fapply <- function(mf, args) {
if (class(mf) == "MalFunc") {
ast <- mf$ast
env <- mf$gen_env(args)
mf$eval(ast, env)
} else {
#print(args)
do.call(mf,args)
}
}
# Lists
new.list <- function(...) new.listl(list(...))
new.listl <- function(lst) { class(lst) <- "List"; lst }
.list_q <- function(obj) "List" == class(obj)
# Vectors
new.vector <- function(...) new.vectorl(list(...))
new.vectorl <- function(lst) { class(lst) <- "Vector"; lst }
.vector_q <- function(obj) "Vector" == class(obj)
# Hash Maps
new.hash_map <- function(...) new.hash_mapl(list(...))
new.hash_mapl <- function(lst) {
.assoc(new.env(), lst)
}
.assoc <- function(src_hm, lst) {
hm <- .clone(src_hm)
if (length(lst) > 0) {
for(i in seq(1,length(lst),2)) {
hm[[lst[[i]]]] <- lst[[i+1]]
}
}
class(hm) <- "HashMap"
hm
}
.dissoc <- function(src_hm, lst) {
hm <- .clone(src_hm)
if (length(lst) > 0) {
for(k in lst) {
remove(list=c(k), envir=hm)
}
}
ls(hm)
class(hm) <- "HashMap"
hm
}
.hash_map_q <- function(obj) "HashMap" == class(obj)
# Atoms
new.atom <- function(val) {
atm <- new.env()
class(atm) <- "Atom"
atm$val <- .clone(val)
atm
}
.atom_q <- function(obj) "Atom" == class(obj)
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