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module Utils from "./utils";
import Exception from "./exception";
import { COMPILER_REVISION, REVISION_CHANGES, createFrame } from "./base";
export function checkRevision(compilerInfo) {
var compilerRevision = compilerInfo && compilerInfo[0] || 1,
currentRevision = COMPILER_REVISION;
if (compilerRevision !== currentRevision) {
if (compilerRevision < currentRevision) {
var runtimeVersions = REVISION_CHANGES[currentRevision],
compilerVersions = REVISION_CHANGES[compilerRevision];
throw new Exception("Template was precompiled with an older version of Handlebars than the current runtime. "+
"Please update your precompiler to a newer version ("+runtimeVersions+") or downgrade your runtime to an older version ("+compilerVersions+").");
} else {
// Use the embedded version info since the runtime doesn't know about this revision yet
throw new Exception("Template was precompiled with a newer version of Handlebars than the current runtime. "+
"Please update your runtime to a newer version ("+compilerInfo[1]+").");
}
}
}
// TODO: Remove this line and break up compilePartial
export function template(templateSpec, env) {
/* istanbul ignore next */
if (!env) {
throw new Exception("No environment passed to template");
}
if (!templateSpec || !templateSpec.main) {
throw new Exception('Unknown template object: ' + typeof templateSpec);
}
// Note: Using env.VM references rather than local var references throughout this section to allow
// for external users to override these as psuedo-supported APIs.
env.VM.checkRevision(templateSpec.compiler);
var invokePartialWrapper = function(partial, context, options) {
if (options.hash) {
context = Utils.extend({}, context, options.hash);
}
if (!partial) {
partial = options.partials[options.name];
}
var result = env.VM.invokePartial.call(this, partial, context, options);
if (result == null && env.compile) {
options.partials[options.name] = env.compile(partial, templateSpec.compilerOptions, env);
result = options.partials[options.name](context, options);
}
if (result != null) {
if (options.indent) {
var lines = result.split('\n');
for (var i = 0, l = lines.length; i < l; i++) {
if (!lines[i] && i + 1 === l) {
break;
}
lines[i] = options.indent + lines[i];
}
result = lines.join('\n');
}
return result;
} else {
throw new Exception("The partial " + options.name + " could not be compiled when running in runtime-only mode");
}
};
// Just add water
var container = {
strict: function(obj, name) {
if (!(name in obj)) {
throw new Exception('"' + name + '" not defined in ' + obj);
}
return obj[name];
},
lookup: function(depths, name) {
var len = depths.length;
for (var i = 0; i < len; i++) {
if (depths[i] && depths[i][name] != null) {
return depths[i][name];
}
}
},
lambda: function(current, context) {
return typeof current === 'function' ? current.call(context) : current;
},
escapeExpression: Utils.escapeExpression,
invokePartial: invokePartialWrapper,
fn: function(i) {
return templateSpec[i];
},
programs: [],
program: function(i, data, declaredBlockParams, blockParams, depths) {
var programWrapper = this.programs[i],
fn = this.fn(i);
if (data || depths || blockParams || declaredBlockParams) {
programWrapper = program(this, i, fn, data, declaredBlockParams, blockParams, depths);
} else if (!programWrapper) {
programWrapper = this.programs[i] = program(this, i, fn);
}
return programWrapper;
},
data: function(data, depth) {
while (data && depth--) {
data = data._parent;
}
return data;
},
merge: function(param, common) {
var ret = param || common;
if (param && common && (param !== common)) {
ret = Utils.extend({}, common, param);
}
return ret;
},
noop: env.VM.noop,
compilerInfo: templateSpec.compiler
};
var ret = function(context, options) {
options = options || {};
var data = options.data;
ret._setup(options);
if (!options.partial && templateSpec.useData) {
data = initData(context, data);
}
var depths,
blockParams = templateSpec.useBlockParams ? [] : undefined;
if (templateSpec.useDepths) {
depths = options.depths ? [context].concat(options.depths) : [context];
}
return templateSpec.main.call(container, context, container.helpers, container.partials, data, blockParams, depths);
};
ret.isTop = true;
ret._setup = function(options) {
if (!options.partial) {
container.helpers = container.merge(options.helpers, env.helpers);
if (templateSpec.usePartial) {
container.partials = container.merge(options.partials, env.partials);
}
} else {
container.helpers = options.helpers;
container.partials = options.partials;
}
};
ret._child = function(i, data, blockParams, depths) {
if (templateSpec.useBlockParams && !blockParams) {
throw new Exception('must pass block params');
}
if (templateSpec.useDepths && !depths) {
throw new Exception('must pass parent depths');
}
return program(container, i, templateSpec[i], data, 0, blockParams, depths);
};
return ret;
}
export function program(container, i, fn, data, declaredBlockParams, blockParams, depths) {
var prog = function(context, options) {
options = options || {};
return fn.call(container,
context,
container.helpers, container.partials,
options.data || data,
blockParams && [options.blockParams].concat(blockParams),
depths && [context].concat(depths));
};
prog.program = i;
prog.depth = depths ? depths.length : 0;
prog.blockParams = declaredBlockParams || 0;
return prog;
}
export function invokePartial(partial, context, options) {
options.partial = true;
if(partial === undefined) {
throw new Exception("The partial " + options.name + " could not be found");
} else if(partial instanceof Function) {
return partial(context, options);
}
}
export function noop() { return ""; }
function initData(context, data) {
if (!data || !('root' in data)) {
data = data ? createFrame(data) : {};
data.root = context;
}
return data;
}
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