diff --git a/DESCRIPTION b/DESCRIPTION
index bd1f475d..ad794bb0 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -21,6 +21,7 @@ Roxygen: list(wrap = FALSE)
 Imports:
     BBmisc (>= 1.10),
     checkmate (>= 1.8.2),
+    stringi,
     methods
 Suggests:
     akima,
diff --git a/NAMESPACE b/NAMESPACE
index 821b2ec2..cfbc7cd4 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -162,6 +162,7 @@ export(makeParamSet)
 export(makeUntypedLearnerParam)
 export(makeUntypedParam)
 export(paramValueToString)
+export(parsePCSFile)
 export(plotEAF)
 export(plotOptPath)
 export(plotYTraces)
@@ -180,6 +181,7 @@ import(BBmisc)
 import(checkmate)
 import(methods)
 import(stats)
+import(stringi)
 useDynLib(ParamHelpers,c_dfRowsToList)
 useDynLib(ParamHelpers,c_generateDesign)
 useDynLib(ParamHelpers,c_trafo_and_set_dep_to_na)
diff --git a/R/parsePCSFile.R b/R/parsePCSFile.R
new file mode 100644
index 00000000..484fc07a
--- /dev/null
+++ b/R/parsePCSFile.R
@@ -0,0 +1,86 @@
+consume = function(s, regexp) {
+  loc = stri_locate_first_regex(s, regexp)[1L, ]
+  e = stri_sub(s, loc[1L], loc[2L])
+  r = stri_join(stri_sub(s, 1L, loc[1L] - 1L), stri_sub(s, loc[2L] + 1L, stri_length(s)))
+  list(match = stri_trim_both(e), rest = stri_trim_both(r))
+}
+
+parseDefault = function(s) {
+  s = consume(s, "\\[.*\\]")
+  stri_trim_both(stri_replace_all_regex(s$match, "[\\[\\]]", ""))
+}
+
+stri_split_trim = function(x, sep = ",") {
+  stri_trim_both(stri_split_fixed(x, sep)[[1L]])
+}
+
+#' @title Read and parse PCS files
+#'
+#' @param file [\code{character(1)}].\cr
+#'   Path to the PCS file.
+#' @return \code{\link{ParamSet}}.
+#' @export
+parsePCSFile = function(file) {
+  assertFileExists(file, access = "r", extension = "pcs")
+
+  lines = stri_read_lines(file)
+  lines = stri_replace_all_regex(lines, "#.*", "")
+  lines = stri_trim_both(lines)
+  lines = lines[nzchar(lines)]
+  result = list()
+
+  lines = lines[!stri_startswith_fixed(lines, "Conditionals:")]
+  j = stri_detect_fixed(lines, "|")
+  lines.cond = lines[j]
+  lines = lines[!j]
+
+  lines = lines[!stri_startswith_fixed(lines, "Forbidden:")]
+  j = stri_startswith_fixed(lines, "{") & stri_endswith_fixed(lines, "}")
+  lines.forbidden = lines[j]
+  lines = lines[!j]
+
+  ### parse param lines
+  for (line in lines) {
+    z = consume(line, "[a-zA-Z0-9_\\-]+\\s*")
+    id = z$match
+
+    if (stri_startswith_fixed(z$rest, "[")) { # num or int param
+      z = consume(z$rest, "^\\[.*?\\]")
+      bounds = stri_replace_all_regex(z$match, "[\\[\\]]", "")
+      bounds = as.numeric(stri_split_trim(bounds))
+      if (stri_detect_fixed(z$rest, "i")) {
+        def = as.numeric(parseDefault(z$rest))
+        par = makeIntegerParam(id = id, lower = bounds[1L], upper = bounds[2L], default = def)
+      } else {
+        def = as.integer(parseDefault(z$rest))
+        par = makeNumericParam(id = id, lower = bounds[1L], upper = bounds[2L], default = def)
+      }
+    } else if (stri_startswith_fixed(z$rest, "{")) { # discrete
+      z = consume(z$rest, "^\\{.*\\}")
+      values = stri_replace_all_regex(z$match, "[{}]", "")
+      values = stri_split_trim(values)
+      def = parseDefault(z$rest)
+      par = makeDiscreteParam(id = id, values = values, default = def)
+    } else {
+      stop("Illegal format")
+    }
+    result[[id]] = par
+  }
+
+  for (line in lines.cond) {
+    s = stri_split_trim(line, "|")
+    id1 = s[1L]
+    stopifnot(id %in% names(result))
+
+    s = stri_split_trim(s[2L], " in ")
+    id2 = s[1L]
+    stopifnot(id2 %in% names(result))
+
+    vals = stri_split_trim(stri_replace_all_regex(s[2L], "[{}]", ""))
+    req = sprintf("%s %%in%% c('%s')", id2, stri_flatten(vals, "','"))
+    req = quote(req)
+    result[[id1]]$requires = req
+  }
+
+  result
+}
diff --git a/R/pcs_helpers.R b/R/pcs_helpers.R
new file mode 100644
index 00000000..e1019ac5
--- /dev/null
+++ b/R/pcs_helpers.R
@@ -0,0 +1,4 @@
+filterEmptyStrings = function(xs) {
+  xs = vcapply(xs, stri_trim)
+  xs[nzchar(xs)]
+}
diff --git a/R/writePCSFile.R b/R/writePCSFile.R
new file mode 100644
index 00000000..4672b8fa
--- /dev/null
+++ b/R/writePCSFile.R
@@ -0,0 +1,35 @@
+#' @title Writes a param set to a PCS files.
+#'
+#' @description
+#'
+#' @template arg_parset
+#' @param path [\code{character(1)}]\cr
+#'   File path for output PCS file.
+#' @param overwrite [\code{logical(1)}]\cr
+#'   Can \code{path} be overwritten?
+#'   Default is \code{FALSE}.
+#' @return Nothing.
+#' @family ParamSet, pcs
+writePCSFile = function(par.set, path, overwrite = FALSE) {
+  assertClass(par.set, "ParamSet")
+  assertPathForOutput(path, overwrite = overwrite)
+  assertFlag(overwrite)
+  lines = character(0L) # result container
+
+  # write line for a scalar (nonvec) param, returns string
+  writePCSScalarLine = function(p) {
+    s = sprintf("%s [%g,%g] [%g]", p$id, p$lower, p$upper, p$default)
+    # print(s)
+    return(s)
+  }
+
+  # loop over params, loop over length of vectors, add line to "lines"
+  for (p in par.set$pars) {
+    len = p$len
+    for (j in 1:p$len) {
+      lines[length(lines) + 1L] = writePCSScalarLine(p)
+    }
+  }
+  stri_write_lines(fname = path, str = lines)
+  invisible(NULL)
+}
diff --git a/R/zzz.R b/R/zzz.R
index b33c7a4b..aba7a76c 100644
--- a/R/zzz.R
+++ b/R/zzz.R
@@ -2,4 +2,5 @@
 #' @import checkmate
 #' @import methods
 #' @import stats
+#' @import stringi
 NULL
diff --git a/inst/pcs_files/branin-params.R b/inst/pcs_files/branin-params.R
new file mode 100644
index 00000000..9c077e22
--- /dev/null
+++ b/inst/pcs_files/branin-params.R
@@ -0,0 +1,5 @@
+ps = makeParamSet(
+  makeNumericParam("x0", lower = -5, upper = 10, default = 10),
+  makeNumericParam("x1", lower = 0, upper = 15, default = 15)
+)
+
diff --git a/inst/pcs_files/branin-params.pcs b/inst/pcs_files/branin-params.pcs
new file mode 100755
index 00000000..f9fdaee4
--- /dev/null
+++ b/inst/pcs_files/branin-params.pcs
@@ -0,0 +1,3 @@
+x0 [-5,10] [10]
+x1 [0, 15] [15]
+
diff --git a/inst/pcs_files/camelback-params.R b/inst/pcs_files/camelback-params.R
new file mode 100644
index 00000000..7b07bf76
--- /dev/null
+++ b/inst/pcs_files/camelback-params.R
@@ -0,0 +1,8 @@
+x0 [-3,3] [3]
+x1 [-2, 2] [2]
+
+ps = makeParamSet(
+  makeNumericParam("x0", lower = -3, upper = 3, default = 3),
+  makeNumericParam("x1", lower = -2, upper = 2, default = 2)
+)
+
diff --git a/inst/pcs_files/camelback-params.pcs b/inst/pcs_files/camelback-params.pcs
new file mode 100755
index 00000000..c9690338
--- /dev/null
+++ b/inst/pcs_files/camelback-params.pcs
@@ -0,0 +1,2 @@
+x0 [-3,3] [3]
+x1 [-2, 2] [2]
\ No newline at end of file
diff --git a/inst/pcs_files/cplex12-params-milp.pcs b/inst/pcs_files/cplex12-params-milp.pcs
new file mode 100755
index 00000000..f5e525bc
--- /dev/null
+++ b/inst/pcs_files/cplex12-params-milp.pcs
@@ -0,0 +1,80 @@
+barrier_limits_growth {1e+6,1e+8,1e+10,1e+12,1e+14}[1e+12] # barrier growth limit. Allegedly called bargrowth. in R, >= 1.0. Now that I check results numerically this can be optimized
+barrier_algorithm {0,1,2,3}[0] # barrier algorithm. Auto, cat
+barrier_crossover {-1,0,1,2}[0] # barrier crossover algorithm. Auto, cat
+barrier_limits_corrections {-1,0,1,4,16,64}[-1] # barrier maximum correction limit. Auto=-1, in N+, poorly informed
+barrier_ordering {0,1,2,3} [0] # barrier ordering algorithm. Auto, cat
+barrier_startalg {1,2,3,4}[1] # barrier starting point algorithm. Auto, cat
+emphasis_memory {no}[no] #MEMORYEMPHASIS. No auto. Binary. Disallow emphasis_memory yes.
+emphasis_mip {0,1,2,3,4}[0] # MIP emphasis switch. Auto, cat
+emphasis_numerical {yes,no}[no] # numerical precision emphasis. No auto, cat. Since I penalize (too) poor numerical precision this is an optimization parameter
+feasopt_mode {0,1,2,3,4,5}[0] # mode of FeasOpt. Auto, cat
+lpmethod {0,1,2,3,4,5,6}[0] # algorithm for continuous problems. Auto, cat
+mip_cuts_cliques {-1,0,1,2,3}[0] # MIP cliques switch. Auto, cat
+mip_cuts_covers {-1,0,1,2,3}[0] # MIP covers switch. Auto, cat
+mip_cuts_disjunctive {-1,0,1,2,3}[0] # MIP disjunctive cuts switch. Auto, cat
+mip_cuts_flowcovers {-1,0,1,2}[0] # MIP flow cover cuts switch. Auto, cat
+mip_cuts_gomory {-1,0,1,2}[0] # MIP Gomory fractional cuts switch. Auto, cat
+mip_cuts_gubcovers {-1,0,1,2}[0] # MIP GUB cuts switch. Auto, cat
+mip_cuts_implied {-1,0,1,2}[0] # MIP implied bound cuts switch. Auto, cat
+mip_cuts_mcfcut {-1,0,1,2}[0] # MCF cut switch. Auto, cat
+mip_cuts_mircut {-1,0,1,2}[0] # MIP MIR (mixed integer rounding) cut switch. Auto, cat
+mip_cuts_pathcut {-1,0,1,2}[0] # MIP flow path cut switch. Auto, cat
+mip_cuts_zerohalfcut {-1,0,1,2} [0] # MIP zero-half cuts switch. Auto, cat
+mip_limits_aggforcut {0,1,2,3,5,10}[3] # constraint aggregation limit for cut generation. No auto, in N+_0
+mip_limits_cutsfactor {1,2,4,8,16}[4] # row multiplier factor for cuts. in R+
+mip_limits_cutpasses {-1,0,1,4,16,64}[0] # number of cutting plane passes. Auto=0, in N+, poorly informed
+mip_limits_gomorycand {50,100,200,400,800}[200] # candidate limit for generating Gomory fractional cuts. No auto, in N+
+mip_limits_gomorypass {0,1,4,16,64}[0] # pass limit for generating Gomory fractional cuts. Auto=0, in N+, poorly informed
+mip_limits_strongcand {2,5,10,20,40}[10] # MIP strong branching candidate list limit. No auto, in N_0+
+mip_limits_strongit {0,1,4,16,64}[0] # MIP strong branching iterations limit. Auto=0, in N+ , poorly informed
+mip_limits_submipnodelim {125,250,500,1000,2000}[500] # limit on nodes explored when a subMIP is being solved. No auto, in N_0+
+mip_ordertype {0,1,2,3}[0] # MIP priority order generation. No auto, cat
+mip_strategy_backtrack {0.9,0.99,0.999,0.9999,0.99999,0.999999} [0.9999] # backtracking tolerance. No auto, any number from 0.0 to 1.0. Despite the name this is not a tolerance parameter
+mip_strategy_bbinterval {2,4,7,15,30,1000}[7] # MIP strategy best bound interval. No auto, in N+_0. 0 is equivalent to infinity
+mip_strategy_branch {-1,0,1} [0] # MIP branching direction. Auto, cat
+mip_strategy_dive {0,1,2,3}[0] # MIP dive strategy. Auto, cat
+mip_strategy_file {0,1}[1] #node storage file switch. No auto. Cat.  DISALLOW values 2 and 3 => they write files to disk (stuff will break and we run out of space)
+mip_strategy_fpheur {-1,0,1,2}[0] # feasibility pump switch. Auto, cat. Does NOT apply for MIQCP
+mip_strategy_heuristicfreq {-1,0,5,10,20,40,80}[0] # MIP heuristic frequency. Auto=0, in N+. 20 is an example used in the manual. It may be totally off...
+mip_strategy_lbheur {yes,no}[no] # local branching heuristic. No auto, cat
+mip_strategy_nodeselect {0,1,2,3}[1] # MIP node selection strategy. No auto, cat
+mip_strategy_order {yes,no}[yes] # MIP priority order switch. No auto, cat. 
+mip_strategy_presolvenode {-1,0,1,2}[0] # node presolve switch. Auto, cat
+mip_strategy_probe {-1,0,1,2,3}[0] # MIP probing level. Auto, cat
+mip_strategy_rinsheur {-1,0,5,10,20,40,80}[0] # RINS heuristic frequency. Auto=0, 20 is an example from the CPLEX parameter reference; could be totally off
+mip_strategy_search {0,1,2} [0] # MIP dynamic search switch. Auto, cat. NOT compatible with callbacks (fine in our case, where we don't use those)
+mip_strategy_startalgorithm {0,1,2,3,4,5,6}[0] # MIP starting algorithm. Auto, cat. SPECIAL CASES: MIQCP and MIQP only allow some of these
+mip_strategy_subalgorithm {0,1,2,3,4,5}[0] # MIP subproblem algorithm. Auto, cat.
+mip_strategy_variableselect {-1,0,1,2,3,4} [0] # MIP variable selection strategy. Auto, cat
+network_netfind {1,2,3}[2] # simplex network extraction level. No auto, cat
+network_pricing {0,1,2}[0] # network simplex pricing algorithm. Auto, cat. The CPLEX parameter reference says the default (0) is identical to option 3, which I thus disabled.
+perturbation_constant {1e-8,1e-7,1e-6,1e-5,1e-4}[1e-6] # part 2 of parameter "simplex_perturbation", conditional on part1=1
+preprocessing_aggregator {-1,0,1,4,16,64}[-1] # preprocessing aggregator application limit
+preprocessing_boundstrength {-1,0,1}[-1] # bound strengthening switch. Auto, cat
+preprocessing_coeffreduce {0,1,2} [2] # coefficient reduction setting. Auto, cat
+preprocessing_dependency {-1,0,1,2,3}[-1] # dependency switch. Auto, cat
+preprocessing_dual {-1,0,1}[0] # presolve dual setting. Auto, cat 
+preprocessing_fill {2,5,10,20,40}[10] # preprocessing aggregator fill. No auto, in N+
+preprocessing_linear {0,1}[1] # linear reduction switch. No auto, cat
+preprocessing_numpass {-1,0,1,4,16,64}[-1] # limit on the number of presolve passes made. Auto=-1, in N+, poorly informed
+preprocessing_reduce {0,1,2,3}[3] # primal and dual reduction type. Auto, cat
+preprocessing_relax {-1,0,1}[-1] # relaxed LP presolve switch. Auto, cat
+preprocessing_repeatpresolve {-1,0,1,2,3}[-1] # MIP repeat presolve switch. Auto, cat
+preprocessing_symmetry {-1,0,1,2,3,4,5} [-1] # symmetry breaking. Auto, cat
+read_scale {-1,0,1}[0] # scale parameter. Auto, cat
+sifting_algorithm {0,1,2,3,4}[0] # sifting subproblem algorithm. Auto, cat. 
+simplex_crash {-1,0,1}[1] # simplex crash ordering. Auto, cat
+simplex_dgradient {0,1,2,3,4,5}[0] # dual simplex pricing algorithm. Auto, cat
+simplex_limits_perturbation {0,1,4,16,64}[0] # simplex perturbation limit. Auto=0, in N+, poorly informed
+simplex_limits_singularity {2,5,10,20,40}[10] # simplex singularity repair limit. No auto, in N_0+
+simplex_perturbation_switch {no,yes}[no] # part 1 of parameter "simplex_perturbation"
+simplex_pgradient {-1,0,1,2,3,4}[0] # primal simplex pricing algorithm. Auto, cat
+simplex_pricing {0,1,4,16,64}[0] # simplex pricing candidate list size. Auto=0, in N+, poorly informed
+simplex_refactor {0,4,16,64,256} [0] #simplex refactoring frequency. 0=Auto. N+. Simplex refactorization interval. Hoyt's LP notes say Chvtal suggests an optimal refactorization interval of 16. 
+simplex_tolerances_markowitz {0.0001, 0.001, 0.01, 0.1, 0.5} [0.01] # Markowitz tolerance. 0.0001 to 0.99999
+
+Conditionals:
+mip_limits_strongcand | mip_strategy_variableselect in {3}
+mip_limits_strongit | mip_strategy_variableselect in {3}
+mip_strategy_order | mip_ordertype in {1,2,3}
+perturbation_constant | simplex_perturbation_switch in {yes}
diff --git a/inst/pcs_files/saps-params.R b/inst/pcs_files/saps-params.R
new file mode 100644
index 00000000..d6685fae
--- /dev/null
+++ b/inst/pcs_files/saps-params.R
@@ -0,0 +1,12 @@
+# alpha [1, 1.4] [1.189]l
+# rho [0, 1] [0.5]
+# ps [0, 0.2] [0.1]
+# wp [0, 0.06] [0.03]
+
+ps = makeParamSet(
+  makeNumericParam("alpha", lower = -5, upper = 10, default = 10),
+  makeNumericParam("rho", lower = 0, upper = 15, default = 15),
+  makeNumericParam("ps", lower = 0, upper = 15, default = 15),
+  makeNumericParam("wp", lower = 0, upper = 15, default = 15)
+)
+
diff --git a/inst/pcs_files/saps-params.pcs b/inst/pcs_files/saps-params.pcs
new file mode 100755
index 00000000..9e13837b
--- /dev/null
+++ b/inst/pcs_files/saps-params.pcs
@@ -0,0 +1,4 @@
+alpha [1, 1.4] [1.189]l
+rho [0, 1] [0.5]
+ps [0, 0.2] [0.1]
+wp [0, 0.06] [0.03]
\ No newline at end of file
diff --git a/inst/pcs_files/spear-params-mixed.pcs b/inst/pcs_files/spear-params-mixed.pcs
new file mode 100755
index 00000000..b51c658b
--- /dev/null
+++ b/inst/pcs_files/spear-params-mixed.pcs
@@ -0,0 +1,38 @@
+sp-var-dec-heur {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19}[0]    # Originally, 3,4,9,10 not used following Domagoj's advice. 20 requires modular arithmetic input format
+sp-learned-clause-sort-heur {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19}[0]   # All values make sense here. 20 requires modular arithmetic input format
+sp-orig-clause-sort-heur {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19}[0]   # All values make sense here. 20 requires modular arithmetic input format
+sp-res-order-heur {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19}[0]     # All values make sense here. 20 requires modular arithmetic input format 
+sp-clause-del-heur {0,1,2}[2]                        # All values make sense here.
+sp-phase-dec-heur {0,1,2,3,4,5,6}[5]                 # All values make sense here. 
+sp-resolution {0,1,2}[1]                             # 0 renders a whole bunch of conditionals irrelevant.
+sp-variable-decay [1, 2] [1.4]l                      # Should be bigger than 1 (o/w increase not decay).  Was:  in 1.1,1.4,2.0, def 1.4
+sp-clause-decay [1, 2] [1.4]l                        # Same thing.
+sp-restart-inc [1.1, 1.9] [1.5]                      # Uniform because multiplicative. Was: in 1.1,1.3,1.5,1.7,1.9, def 1.5
+sp-learned-size-factor [0.1, 1.6] [0.4]l             # Uniform on logarithmic scale (starting value). Was: in 0.1,0.2,0.4,0.8,1.6, def 0.4
+sp-learned-clauses-inc [1.1, 1.5] [1.3]              # 1.2 and 1.4 were introduced later. Uniform because multiplicative Was: in1.1,1.2,1.3,1.4,1.5, def 1.3
+sp-clause-activity-inc [0.5, 1.5] [1]                # Was: in 0.5,1,1.5, def 1
+sp-var-activity-inc [0.5, 1.5] [1]                   # Was: in 0.5,1,1.5, def 1
+sp-rand-phase-dec-freq{0, 0.0001, 0.001, 0.005, 0.01, 0.05}[0.001] # Used discretized version to preserve 0. Never picked 0.05 in previous experiments, always zero.
+sp-rand-var-dec-freq {0, 0.0001, 0.001, 0.005, 0.01, 0.05}[0.001]  # Used discretized version to preserve 0. Never picked 0.05 in previous experiments, always zero.
+sp-rand-var-dec-scaling [0.3, 1.1] [1]               # Domagoj said the previous values were too coarse, so finer discretization now.
+sp-rand-phase-scaling [0.3, 1.1] [1]                 # Same thing. Was: in 0.3,0.6,0.9,1,1.1, def 1
+sp-max-res-lit-inc [0.25, 4][1]l                     # 0.5 and 2 were introduced later. Was: in 0.25,0.5,1,2,4, def 1
+sp-first-restart [25, 3200] [100]il                  # Uniform on logarithmic scale (starting value). Was: in 25,50,100,200,400,800,1600,3200, def 100
+sp-res-cutoff-cls [2, 20] [8]il                      # Only up to 20 allowed, would've used 32 otherwise.
+sp-res-cutoff-lits [100, 1600] [400]il               # Was: in 100,200,400,800,1600, def 400
+sp-max-res-runs [1, 32] [4]il                        # Was: in 1,2,4,8,16,32, def 4
+sp-update-dec-queue {0,1}[1]                         # Enable by default.
+sp-use-pure-literal-rule {0,1}[1]                    # Enable by default. 
+sp-clause-inversion {0,1}[1]                         # Enable by default. Enable reversion of learned clauses if fixed order (sp-learned-clause-sort-heur=19) 
+
+Conditionals:
+sp-rand-phase-dec-freq|sp-phase-dec-heur in {0,1,3,4,5,6}  # when heuristic is random, then additional random steps don't change anything
+sp-rand-var-dec-scaling|sp-rand-var-dec-freq in {0.0001, 0.001, 0.005, 0.01, 0.05}  # not 0
+sp-rand-phase-scaling|sp-rand-phase-dec-freq in {0.0001, 0.001, 0.005, 0.01, 0.05}  # not 0
+sp-clause-inversion|sp-learned-clause-sort-heur in {19}
+
+sp-res-order-heur|sp-resolution in {1,2}
+sp-max-res-lit-inc|sp-resolution in {1,2}
+sp-res-cutoff-cls|sp-resolution in {1,2}
+sp-res-cutoff-lits|sp-resolution in {1,2}
+sp-max-res-runs|sp-resolution in {1,2}
\ No newline at end of file
diff --git a/man/parsePCSFile.Rd b/man/parsePCSFile.Rd
new file mode 100644
index 00000000..8849cee2
--- /dev/null
+++ b/man/parsePCSFile.Rd
@@ -0,0 +1,15 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/parsePCSFile.R
+\name{parsePCSFile}
+\alias{parsePCSFile}
+\title{Read and parse PCS files}
+\usage{
+parsePCSFile(file)
+}
+\arguments{
+\item{file}{[\code{character(1)}].\cr
+Path to the PCS file.}
+}
+\value{
+\code{\link{ParamSet}}.
+}
diff --git a/man/writePCSFile.Rd b/man/writePCSFile.Rd
new file mode 100644
index 00000000..a1a3272a
--- /dev/null
+++ b/man/writePCSFile.Rd
@@ -0,0 +1,25 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/writePCSFile.R
+\name{writePCSFile}
+\alias{writePCSFile}
+\title{Writes a param set to a PCS files.}
+\usage{
+writePCSFile(par.set, path, overwrite = FALSE)
+}
+\arguments{
+\item{par.set}{[\code{\link{ParamSet}}]\cr
+Parameter set.}
+
+\item{path}{[\code{character(1)}]\cr
+File path for output PCS file.}
+
+\item{overwrite}{[\code{logical(1)}]\cr
+Can \code{path} be overwritten?
+Default is \code{FALSE}.}
+}
+\value{
+Nothing.
+}
+\description{
+
+}
diff --git a/test.R b/test.R
new file mode 100644
index 00000000..e6e7f1b5
--- /dev/null
+++ b/test.R
@@ -0,0 +1,9 @@
+load_all()
+
+ps = makeParamSet(
+  makeNumericParam("x0", lower = -5, upper = 10, default = 10),
+  makeNumericParam("x1", lower = 0, upper = 15, default = 15 )
+)
+
+
+writePCSFile(ps, path = "~/cos/ParamHelpers/bla.pcs", overwrite = TRUE)
diff --git a/tests/testthat/test_parsePCSFile.R b/tests/testthat/test_parsePCSFile.R
new file mode 100644
index 00000000..5dfea56f
--- /dev/null
+++ b/tests/testthat/test_parsePCSFile.R
@@ -0,0 +1,40 @@
+context("parsePCSFile")
+
+test_that("parsePCSFile ", {
+  path = system.file("inst/pcs_files", package = "ParamHelpers")
+  fns = list.files(path, pattern = ".pcs", full.names = TRUE)
+
+   #FIXME: loop over all!
+
+
+  # read a pcs file, trim WS, and remove all empty lines
+  readPCSLines = function(path) {
+    lines = stri_read_lines(fn)
+    lines = vcapply(lines, str_trim)
+    lines[nzchar(lines)]
+  }
+
+
+  for (fn in fns[1]) {
+    # print(fn)
+    # parse normal PCS files
+    # ps = parsePCSFile(fn)
+    # parse mathing R file into envir
+    fnr = stri_replace(fn, fixed = ".pcs", ".R")
+    # print(fnr)
+    ee = new.env()
+    source(fnr, local = ee)
+
+    # check that parsed result matches manual paramset R file
+    # expect_equal(ps, ee$ps, info = sprintf("pcs parser: %s", fn))
+
+    # check that writer works
+    outpath = tempfile()
+    writePCSFile(ee$ps, outpath)
+    lines1 = readPCSLines(fn)
+    # print(lines1)
+    lines2 = readPCSLines(outpath)
+    # print(lines2)
+    expect_equal(lines1, lines2, info = sprintf("pcs writer: %s", fnr))
+  }
+})